odoo_source/addons/mail/models/mail_thread.py

# -*- coding: utf-8 -*-
# Part of Odoo. See LICENSE file for full copyright and licensing details.

import ast
import base64
import datetime
import dateutil
import email
import email.policy
import hashlib
import hmac
import json
import lxml
import logging
import pytz
import re
import time
import threading

from collections import namedtuple
from email.message import EmailMessage
from email import message_from_string
from lxml import etree
from werkzeug import urls
from xmlrpc import client as xmlrpclib
from markupsafe import Markup

from odoo import _, api, exceptions, fields, models, tools, registry, SUPERUSER_ID, Command
from odoo.exceptions import MissingError, AccessError
from odoo.osv import expression
from odoo.tools import is_html_empty, html_escape, html2plaintext
from odoo.tools.misc import clean_context, split_every

_logger = logging.getLogger(__name__)


class MailThread(models.AbstractModel):
    ''' mail_thread model is meant to be inherited by any model that needs to
        act as a discussion topic on which messages can be attached. Public
        methods are prefixed with ``message_`` in order to avoid name
        collisions with methods of the models that will inherit from this class.

        ``mail.thread`` defines fields used to handle and display the
        communication history. ``mail.thread`` also manages followers of
        inheriting classes. All features and expected behavior are managed
        by mail.thread. Widgets has been designed for the 7.0 and following
        versions of Odoo.

        Inheriting classes are not required to implement any method, as the
        default implementation will work for any model. However it is common
        to override at least the ``message_new`` and ``message_update``
        methods (calling ``super``) to add model-specific behavior at
        creation and update of a thread when processing incoming emails.

        Options:
            - _mail_flat_thread: if set to True, all messages without parent_id
                are automatically attached to the first message posted on the
                resource. If set to False, the display of Chatter is done using
                threads, and no parent_id is automatically set.

    MailThread features can be somewhat controlled through context keys :

     - ``mail_create_nosubscribe``: at create or message_post, do not subscribe
       uid to the record thread
     - ``mail_create_nolog``: at create, do not log the automatic '<Document>
       created' message
     - ``mail_notrack``: at create and write, do not perform the value tracking
       creating messages
     - ``tracking_disable``: at create and write, perform no MailThread features
       (auto subscription, tracking, post, ...)
     - ``mail_notify_force_send``: if less than 50 email notifications to send,
       send them directly instead of using the queue; True by default
    '''
    _name = 'mail.thread'
    _description = 'Email Thread'
    _mail_flat_thread = True  # flatten the discussion history
    _mail_post_access = 'write'  # access required on the document to post on it
    _primary_email = 'email'  # Must be set for the models that can be created by alias
    _Attachment = namedtuple('Attachment', ('fname', 'content', 'info'))

    message_is_follower = fields.Boolean(
        'Is Follower', compute='_compute_message_is_follower', search='_search_message_is_follower')
    message_follower_ids = fields.One2many(
        'mail.followers', 'res_id', string='Followers', groups='base.group_user')
    message_partner_ids = fields.Many2many(
        comodel_name='res.partner', string='Followers (Partners)',
        compute='_compute_message_partner_ids',
        inverse='_inverse_message_partner_ids',
        search='_search_message_partner_ids',
        groups='base.group_user')
    message_ids = fields.One2many(
        'mail.message', 'res_id', string='Messages',
        domain=lambda self: [('message_type', '!=', 'user_notification')], auto_join=True)
    has_message = fields.Boolean(compute="_compute_has_message", search="_search_has_message", store=False)
    message_needaction = fields.Boolean(
        'Action Needed',
        compute='_compute_message_needaction', search='_search_message_needaction',
        help="If checked, new messages require your attention.")
    message_needaction_counter = fields.Integer(
        'Number of Actions', compute='_compute_message_needaction',
        help="Number of messages which requires an action")
    message_has_error = fields.Boolean(
        'Message Delivery error',
        compute='_compute_message_has_error', search='_search_message_has_error',
        help="If checked, some messages have a delivery error.")
    message_has_error_counter = fields.Integer(
        'Number of errors', compute='_compute_message_has_error',
        help="Number of messages with delivery error")
    message_attachment_count = fields.Integer('Attachment Count', compute='_compute_message_attachment_count', groups="base.group_user")

    @api.depends('message_follower_ids')
    def _compute_message_partner_ids(self):
        for thread in self:
            thread.message_partner_ids = thread.message_follower_ids.mapped('partner_id')

    def _inverse_message_partner_ids(self):
        for thread in self:
            new_partners_ids = thread.message_partner_ids
            previous_partners_ids = thread.message_follower_ids.partner_id
            removed_partners_ids = previous_partners_ids - new_partners_ids
            added_patners_ids = new_partners_ids - previous_partners_ids
            if added_patners_ids:
                thread.message_subscribe(added_patners_ids.ids)
            if removed_partners_ids:
                thread.message_unsubscribe(removed_partners_ids.ids)

    @api.model
    def _search_message_partner_ids(self, operator, operand):
        """Search function for message_follower_ids

        Do not use with operator 'not in'. Use instead message_is_followers
        """
        # TOFIX make it work with not in
        assert operator != "not in", "Do not search message_follower_ids with 'not in'"
        # prefetch 'res_id' for the performance of mapped() below
        followers = self.env['mail.followers'].sudo().search_fetch(
            [('res_model', '=', self._name), ('partner_id', operator, operand)],
            ['res_id'],
        )
        return [('id', 'in', followers.mapped('res_id'))]

    @api.depends('message_follower_ids')
    def _compute_message_is_follower(self):
        followers = self.env['mail.followers'].sudo().search_fetch(
            [('res_model', '=', self._name), ('res_id', 'in', self.ids), ('partner_id', '=', self.env.user.partner_id.id)],
            ['res_id'],
        )
        following_ids = set(followers.mapped('res_id'))
        for record in self:
            record.message_is_follower = record.id in following_ids

    @api.model
    def _search_message_is_follower(self, operator, operand):
        followers = self.env['mail.followers'].sudo().search_fetch(
            [('res_model', '=', self._name), ('partner_id', '=', self.env.user.partner_id.id)],
            ['res_id'],
        )
        # Cases ('message_is_follower', '=', True) or  ('message_is_follower', '!=', False)
        if (operator == '=' and operand) or (operator == '!=' and not operand):
            return [('id', 'in', followers.mapped('res_id'))]
        else:
            return [('id', 'not in', followers.mapped('res_id'))]

    def _compute_has_message(self):
        self.env['mail.message'].flush_model()
        self.env.cr.execute("""
            SELECT distinct res_id
              FROM mail_message mm
             WHERE res_id = any(%s)
               AND mm.model=%s
        """, [self.ids, self._name])
        channel_ids = {r[0] for r in self.env.cr.fetchall()}
        for record in self:
            record.has_message = record.id in channel_ids

    def _search_has_message(self, operator, value):
        if (operator == '=' and value is True) or (operator == '!=' and value is False):
            operator_new = 'inselect'
        else:
            operator_new = 'not inselect'
        return [('id', operator_new, ("SELECT res_id FROM mail_message WHERE model=%s", [self._name]))]

    def _compute_message_needaction(self):
        res = dict.fromkeys(self.ids, 0)
        if self.ids:
            # search for unread messages, directly in SQL to improve performances
            self._cr.execute(""" SELECT msg.res_id FROM mail_message msg
                                 RIGHT JOIN mail_notification rel
                                 ON rel.mail_message_id = msg.id AND rel.res_partner_id = %s AND (rel.is_read = false OR rel.is_read IS NULL)
                                 WHERE msg.model = %s AND msg.res_id in %s AND msg.message_type != 'user_notification'""",
                             (self.env.user.partner_id.id, self._name, tuple(self.ids),))
            for result in self._cr.fetchall():
                res[result[0]] += 1

        for record in self:
            record.message_needaction_counter = res.get(record._origin.id, 0)
            record.message_needaction = bool(record.message_needaction_counter)

    @api.model
    def _search_message_needaction(self, operator, operand):
        return [('message_ids.needaction', operator, operand)]

    def _compute_message_has_error(self):
        res = {}
        if self.ids:
            self.env.cr.execute("""
                    SELECT msg.res_id, COUNT(msg.res_id)
                      FROM mail_message msg
                INNER JOIN mail_notification notif
                        ON notif.mail_message_id = msg.id
                     WHERE notif.notification_status in ('exception', 'bounce')
                       AND notif.author_id = %(author_id)s
                       AND msg.model = %(model_name)s
                       AND msg.res_id in %(res_ids)s
                       AND msg.message_type != 'user_notification'
                  GROUP BY msg.res_id
            """, {'author_id': self.env.user.partner_id.id, 'model_name': self._name, 'res_ids': tuple(self.ids)})
            res.update(self._cr.fetchall())

        for record in self:
            record.message_has_error_counter = res.get(record._origin.id, 0)
            record.message_has_error = bool(record.message_has_error_counter)

    @api.model
    def _search_message_has_error(self, operator, operand):
        message_ids = self.env['mail.message']._search([('has_error', operator, operand), ('author_id', '=', self.env.user.partner_id.id)])
        return [('message_ids', 'in', message_ids)]

    def _compute_message_attachment_count(self):
        read_group_var = self.env['ir.attachment']._read_group([('res_id', 'in', self.ids), ('res_model', '=', self._name)],
                                                              fields=['res_id'],
                                                              groupby=['res_id'])

        attachment_count_dict = dict((d['res_id'], d['res_id_count']) for d in read_group_var)
        for record in self:
            record.message_attachment_count = attachment_count_dict.get(record.id, 0)

    # ------------------------------------------------------------
    # CRUD
    # ------------------------------------------------------------

    @api.model_create_multi
    def create(self, vals_list):
        """ Chatter override :
            - subscribe uid
            - subscribe followers of parent
            - log a creation message
        """
        if self._context.get('tracking_disable'):
            threads = super(MailThread, self).create(vals_list)
            threads._track_discard()
            return threads

        threads = super(MailThread, self).create(vals_list)
        # subscribe uid unless asked not to
        if not self._context.get('mail_create_nosubscribe') and threads and self.env.user.active:
            self.env['mail.followers']._insert_followers(
                threads._name, threads.ids,
                self.env.user.partner_id.ids, subtypes=None,
                customer_ids=[],
                check_existing=False
            )

        # auto_subscribe: take values and defaults into account
        create_values_list = {}
        for thread, values in zip(threads, vals_list):
            create_values = dict(values)
            for key, val in self._context.items():
                if key.startswith('default_') and key[8:] not in create_values:
                    create_values[key[8:]] = val
            thread._message_auto_subscribe(create_values, followers_existing_policy='update')
            create_values_list[thread.id] = create_values

        # automatic logging unless asked not to (mainly for various testing purpose)
        if not self._context.get('mail_create_nolog'):
            threads_no_subtype = self.env[self._name]
            for thread in threads:
                subtype = thread._creation_subtype()
                if subtype:  # if we have a subtype, post message to notify users from _message_auto_subscribe
                    thread.sudo().message_post(subtype_id=subtype.id, author_id=self.env.user.partner_id.id)
                else:
                    threads_no_subtype += thread
            if threads_no_subtype:
                bodies = dict(
                    (thread.id, thread._creation_message())
                    for thread in threads_no_subtype)
                threads_no_subtype._message_log_batch(bodies=bodies)

        # post track template if a tracked field changed
        threads._track_discard()
        if not self._context.get('mail_notrack'):
            fnames = self._track_get_fields()
            for thread in threads:
                create_values = create_values_list[thread.id]
                changes = [fname for fname in fnames if create_values.get(fname)]
                # based on tracked field to stay consistent with write
                # we don't consider that a falsy field is a change, to stay consistent with previous implementation,
                # but we may want to change that behaviour later.
                thread._message_track_post_template(changes)

        return threads

    def write(self, values):
        if self._context.get('tracking_disable'):
            return super(MailThread, self).write(values)

        if not self._context.get('mail_notrack'):
            self._track_prepare(self._fields)

        # Perform write
        result = super(MailThread, self).write(values)

        # update followers
        self._message_auto_subscribe(values)

        return result

    def unlink(self):
        """ Override unlink to delete messages and followers. This cannot be
        cascaded, because link is done through (res_model, res_id). """
        if not self:
            return True
        # discard pending tracking
        self._track_discard()
        self.env['mail.message'].sudo().search([('model', '=', self._name), ('res_id', 'in', self.ids)]).unlink()
        res = super(MailThread, self).unlink()
        self.env['mail.followers'].sudo().search(
            [('res_model', '=', self._name), ('res_id', 'in', self.ids)]
        ).unlink()
        return res

    def copy_data(self, default=None):
        # avoid tracking multiple temporary changes during copy
        return super(MailThread, self.with_context(mail_notrack=True)).copy_data(default=default)

    @api.model
    def get_empty_list_help(self, help_message):
        """ Override of BaseModel.get_empty_list_help() to generate an help message
        that adds alias information. """
        model = self._context.get('empty_list_help_model')
        res_id = self._context.get('empty_list_help_id')
        catchall_domain = self.env['ir.config_parameter'].sudo().get_param("mail.catchall.domain")
        document_name = self._context.get('empty_list_help_document_name', _('document'))
        nothing_here = is_html_empty(help_message)
        alias = None

        if catchall_domain and model and res_id:  # specific res_id -> find its alias (i.e. section_id specified)
            record = self.env[model].sudo().browse(res_id)
            # check that the alias effectively creates new records
            if record.alias_id and record.alias_id.alias_name and \
                    record.alias_id.alias_model_id and \
                    record.alias_id.alias_model_id.model == self._name and \
                    record.alias_id.alias_force_thread_id == 0:
                alias = record.alias_id
        if not alias and catchall_domain and model:  # no res_id or res_id not linked to an alias -> generic help message, take a generic alias of the model
            Alias = self.env['mail.alias']
            aliases = Alias.search([
                ("alias_parent_model_id.model", "=", model),
                ("alias_name", "!=", False),
                ('alias_force_thread_id', '=', False),
                ('alias_parent_thread_id', '=', False)], order='id ASC')
            if aliases and len(aliases) == 1:
                alias = aliases[0]

        if alias:
            email_link = Markup("<a href='mailto:%s'>%s</a>") % (alias.display_name, alias.display_name)
            if nothing_here:
                dyn_help = _("Add a new %(document)s or send an email to %(email_link)s",
                             document=html_escape(document_name),
                             email_link=email_link,
                            )
                return super().get_empty_list_help(f"<p class='o_view_nocontent_smiling_face'>{dyn_help}</p>")
            # do not add alias two times if it was added previously
            if "oe_view_nocontent_alias" not in help_message:
                dyn_help = _("Create new %(document)s by sending an email to %(email_link)s",
                             document=html_escape(document_name),
                             email_link=email_link,
                            )
                return super().get_empty_list_help(f"{help_message}<p class='oe_view_nocontent_alias'>{dyn_help}</p>")

        if nothing_here:
            dyn_help = _("Create new %(document)s", document=html_escape(document_name))
            return super().get_empty_list_help(f"<p class='o_view_nocontent_smiling_face'>{dyn_help}</p>")

        return super().get_empty_list_help(help_message)

    # ------------------------------------------------------
    # MODELS / CRUD HELPERS
    # ------------------------------------------------------

    def _compute_field_value(self, field):
        if not self._context.get('tracking_disable') and not self._context.get('mail_notrack'):
            self._track_prepare(f.name for f in self.pool.field_computed[field] if f.store)

        return super()._compute_field_value(field)

    def _creation_subtype(self):
        """ Give the subtypes triggered by the creation of a record

        :returns: a subtype browse record (empty if no subtype is triggered)
        """
        return self.env['mail.message.subtype']

    def _creation_message(self):
        """ Get the creation message to log into the chatter at the record's creation.
        :returns: The message's body to log.
        """
        self.ensure_one()
        doc_name = self.env['ir.model']._get(self._name).name
        return _('%s created', doc_name)

    @api.model
    def _get_mail_message_access(self, res_ids, operation, model_name=None):
        """ mail.message check permission rules for related document. This method is
            meant to be inherited in order to implement addons-specific behavior.
            A common behavior would be to allow creating messages when having read
            access rule on the document, for portal document such as issues. """

        DocModel = self.env[model_name] if model_name else self
        create_allow = getattr(DocModel, '_mail_post_access', 'write')

        if operation in ['write', 'unlink']:
            check_operation = 'write'
        elif operation == 'create' and create_allow in ['create', 'read', 'write', 'unlink']:
            check_operation = create_allow
        elif operation == 'create':
            check_operation = 'write'
        else:
            check_operation = operation
        return check_operation

    def _valid_field_parameter(self, field, name):
        # allow tracking on models inheriting from 'mail.thread'
        return name == 'tracking' or super()._valid_field_parameter(field, name)

    def _fallback_lang(self):
        if not self._context.get("lang"):
            return self.with_context(lang=self.env.user.lang)
        return self

    def _check_can_update_message_content(self, messages):
        """" Checks that the current user can update the content of the message.
        Current heuristic is

          * limited to note;
          * if no tracking;
          * only for user generated content;
        """
        note_id = self.env['ir.model.data']._xmlid_to_res_id('mail.mt_note')
        if any(message.subtype_id.id != note_id for message in messages):
            raise exceptions.UserError(_("Only logged notes can have their content updated on model '%s'", self._name))
        if messages.tracking_value_ids:
            raise exceptions.UserError(_("Messages with tracking values cannot be modified"))
        if any(message.message_type != 'comment' for message in messages):
            raise exceptions.UserError(_("Only messages type comment can have their content updated"))

    # ------------------------------------------------------------
    # FIELDS HELPERS
    # ------------------------------------------------------------

    @api.model
    def _mail_get_partner_fields(self):
        """ This method returns the fields to use to find the contact to link
        when sending emails or notifications. Having partner is not always
        necessary but gives more flexibility to notifications management. """
        return [fname for fname in ('partner_id', 'partner_ids')
                if fname in self]

    def _mail_get_partners(self):
        """ Give the default partners associated to customers.

        :return dict: for each record ID, a res.partner recordsets being default
          customers to contact;
        """
        partner_fields = self._mail_get_partner_fields()
        return dict(
            (record.id, self.env['res.partner'].union(*[record[fname] for fname in partner_fields]))
            for record in self
        )

    @api.model
    def _mail_get_primary_email_field(self):
        """ Check if the "_primary_email" model attribute is correctly set and
        matches an existing field, and return it. Otherwise return None. """
        primary_email = getattr(self, '_primary_email', None)
        if primary_email and primary_email in self._fields:
            return primary_email
        return None

    # ------------------------------------------------------
    # TRACKING / LOG
    # ------------------------------------------------------

    def _track_prepare(self, fields_iter):
        """ Prepare the tracking of ``fields_iter`` for ``self``.

        :param iter fields_iter: iterable of fields names to potentially track
        """
        fnames = self._track_get_fields().intersection(fields_iter)
        if not fnames:
            return
        self.env.cr.precommit.add(self._track_finalize)
        initial_values = self.env.cr.precommit.data.setdefault(f'mail.tracking.{self._name}', {})
        for record in self:
            if not record.id:
                continue
            values = initial_values.setdefault(record.id, {})
            if values is not None:
                for fname in fnames:
                    values.setdefault(fname, record[fname])

    def _track_discard(self):
        """ Prevent any tracking of fields on ``self``. """
        if not self._track_get_fields():
            return
        self.env.cr.precommit.add(self._track_finalize)
        initial_values = self.env.cr.precommit.data.setdefault(f'mail.tracking.{self._name}', {})
        # disable tracking by setting initial values to None
        for id_ in self.ids:
            initial_values[id_] = None

    def _track_finalize(self):
        """ Generate the tracking messages for the records that have been
        prepared with ``_tracking_prepare``.
        """
        initial_values = self.env.cr.precommit.data.pop(f'mail.tracking.{self._name}', {})
        ids = [id_ for id_, vals in initial_values.items() if vals]
        if not ids:
            return
        records = self.browse(ids).sudo()
        fnames = self._track_get_fields()
        context = clean_context(self._context)
        tracking = records.with_context(context)._message_track(fnames, initial_values)
        for record in records:
            changes, _tracking_value_ids = tracking.get(record.id, (None, None))
            record._message_track_post_template(changes)
        # this method is called after the main flush() and just before commit();
        # we have to flush() again in case we triggered some recomputations
        self.env.flush_all()

    def _track_set_log_message(self, message):
        """ Link tracking to a message logged as body, in addition to subtype
        description (if set) and tracking values that make the core content of
        tracking message. """
        if not self._track_get_fields():
            return
        body_values = self.env.cr.precommit.data.setdefault(f'mail.tracking.message.{self._name}', {})
        for id_ in self.ids:
            body_values[id_] = message

    @tools.ormcache('self.env.uid', 'self.env.su')
    def _track_get_fields(self):
        """ Return the set of tracked fields names for the current model. """
        model_fields = {
            name
            for name, field in self._fields.items()
            if getattr(field, 'tracking', None) or getattr(field, 'track_visibility', None)
        }

        return model_fields and set(self.fields_get(model_fields))

    def _track_subtype(self, initial_values):
        """ Give the subtypes triggered by the changes on the record according
        to values that have been updated.

        :param dict initial_values: original values of the record; only modified
          fields are present in the dict

        :returns: a subtype browse record or False if no subtype is triggered
        """
        self.ensure_one()
        return False

    def _message_track(self, fields_iter, initial_values_dict):
        """ Track updated values. Comparing the initial and current values of
        the fields given in tracked_fields, it generates a message containing
        the updated values. This message can be linked to a mail.message.subtype
        given by the ``_track_subtype`` method.

        :param iter fields_iter: iterable of field names to track
        :param dict initial_values_dict: mapping {record_id: initial_values}
          where initial_values is a dict {field_name: value, ... }
        :return: mapping {record_id: (changed_field_names, tracking_value_ids)}
            containing existing records only
        """
        if not fields_iter:
            return {}

        tracked_fields = self.fields_get(fields_iter)
        tracking = dict()
        for record in self:
            try:
                tracking[record.id] = record._mail_track(tracked_fields, initial_values_dict[record.id])
            except MissingError:
                continue

        # find content to log as body
        bodies = self.env.cr.precommit.data.pop(f'mail.tracking.message.{self._name}', {})
        for record in self:
            changes, tracking_value_ids = tracking.get(record.id, (None, None))
            if not changes:
                continue

            # find subtypes and post messages or log if no subtype found
            subtype = record._track_subtype(
                dict((col_name, initial_values_dict[record.id][col_name])
                     for col_name in changes)
            )
            if subtype:
                if not subtype.exists():
                    _logger.debug('subtype "%s" not found' % subtype.name)
                    continue
                record.message_post(
                    body=bodies.get(record.id) or '',
                    subtype_id=subtype.id,
                    tracking_value_ids=tracking_value_ids
                )
            elif tracking_value_ids:
                record._message_log(
                    body=bodies.get(record.id) or '',
                    tracking_value_ids=tracking_value_ids
                )

        return tracking

    def _message_track_post_template(self, changes):
        """ Based on a tracking, post a message defined by ``_track_template``
        parameters. It allows to implement automatic post of messages based
        on templates (e.g. stage change triggering automatic email).

        :param dict changes: mapping {record_id: (changed_field_names, tracking_value_ids)}
            containing existing records only
        """
        if not self or not changes:
            return True
        # Clean the context to get rid of residual default_* keys
        # that could cause issues afterward during the mail.message
        # generation. Example: 'default_parent_id' would refer to
        # the parent_id of the current record that was used during
        # its creation, but could refer to wrong parent message id,
        # leading to a traceback in case the related message_id
        # doesn't exist
        cleaned_self = self.with_context(clean_context(self._context))._fallback_lang()
        templates = self._track_template(changes)
        default_composition_mode = 'mass_mail' if len(self) != 1 else 'comment'
        for _field_name, (template, post_kwargs) in templates.items():
            if not template:
                continue

            composition_mode = post_kwargs.pop('composition_mode', default_composition_mode)
            if composition_mode == 'mass_mail':
                cleaned_self.message_mail_with_source(template, **post_kwargs)
            else:
                cleaned_self.message_post_with_source(template, **post_kwargs)
        return True

    def _track_template(self, changes):
        return dict()

    # ------------------------------------------------------
    # MAIL GATEWAY
    # ------------------------------------------------------

    def _routing_warn(self, error_message, message_id, route, raise_exception=True):
        """ Tools method used in _routing_check_route: whether to log a warning or raise an error """
        short_message = _("Mailbox unavailable - %s", error_message)
        full_message = ('Routing mail with Message-Id %s: route %s: %s' %
                        (message_id, route, error_message))
        _logger.info(full_message)
        if raise_exception:
            # sender should not see private diagnostics info, just the error
            raise ValueError(short_message)

    def _routing_create_bounce_email(self, email_from, body_html, message, **mail_values):
        bounce_to = tools.decode_message_header(message, 'Return-Path') or email_from
        bounce_mail_values = {
            'author_id': False,
            'body_html': body_html,
            'subject': 'Re: %s' % message.get('subject'),
            'email_to': bounce_to,
            'auto_delete': True,
        }
        bounce_from = self.env['ir.mail_server']._get_default_bounce_address()
        if bounce_from:
            bounce_mail_values['email_from'] = tools.formataddr(('MAILER-DAEMON', bounce_from))
        elif self.env['ir.config_parameter'].sudo().get_param("mail.catchall.alias") not in message['To']:
            bounce_mail_values['email_from'] = tools.decode_message_header(message, 'To')
        else:
            bounce_mail_values['email_from'] = tools.formataddr(('MAILER-DAEMON', self.env.user.email_normalized))
        bounce_mail_values.update(mail_values)
        self.env['mail.mail'].sudo().create(bounce_mail_values).send()

    @api.model
    def _routing_handle_bounce(self, email_message, message_dict):
        """ Handle bounce of incoming email. Based on values of the bounce (email
        and related partner, send message and its messageID)

          * find blacklist-enabled records with email_normalized = bounced email
            and call ``_message_receive_bounce`` on each of them to propagate
            bounce information through various records linked to same email;
          * if not already done (i.e. if original record is not blacklist enabled
            like a bounce on an applicant), find record linked to bounced message
            and call ``_message_receive_bounce``;

        :param email_message: incoming email;
        :type email_message: email.message;
        :param message_dict: dictionary holding already-parsed values and in
            which bounce-related values will be added;
        :type message_dict: dictionary;
        """
        bounced_record, bounced_record_done = False, False
        bounced_email, bounced_partner = message_dict['bounced_email'], message_dict['bounced_partner']
        bounced_msg_ids, bounced_message = message_dict['bounced_msg_ids'], message_dict['bounced_message']

        if bounced_email:
            bounced_model, bounced_res_id = bounced_message.model, bounced_message.res_id

            if bounced_model and bounced_model in self.env and bounced_res_id:
                bounced_record = self.env[bounced_model].sudo().browse(bounced_res_id).exists()

            bl_models = self.env['ir.model'].sudo().search(['&', ('is_mail_blacklist', '=', True), ('model', '!=', 'mail.thread.blacklist')])
            for model in [bl_model for bl_model in bl_models if bl_model.model in self.env]:  # transient test mode
                rec_bounce_w_email = self.env[model.model].sudo().search([('email_normalized', '=', bounced_email)])
                rec_bounce_w_email._message_receive_bounce(bounced_email, bounced_partner)
                bounced_record_done = bounced_record_done or (bounced_record and model.model == bounced_model and bounced_record in rec_bounce_w_email)

            # set record as bounced unless already done due to blacklist mixin
            if bounced_record and not bounced_record_done and issubclass(type(bounced_record), self.pool['mail.thread']):
                bounced_record._message_receive_bounce(bounced_email, bounced_partner)

            if bounced_partner and bounced_message:
                self.env['mail.notification'].sudo().search([
                    ('mail_message_id', '=', bounced_message.id),
                    ('res_partner_id', 'in', bounced_partner.ids)]
                ).write({
                    'failure_reason': html2plaintext(message_dict.get('body') or ''),
                    'failure_type': 'mail_bounce',
                    'notification_status': 'bounce',
                })

        if bounced_record:
            _logger.info('Routing mail from %s to %s with Message-Id %s: not routing bounce email from %s replying to %s (model %s ID %s)',
                         message_dict['email_from'], message_dict['to'], message_dict['message_id'], bounced_email, bounced_msg_ids, bounced_model, bounced_res_id)
        elif bounced_email:
            _logger.info('Routing mail from %s to %s with Message-Id %s: not routing bounce email from %s replying to %s (no document found)',
                         message_dict['email_from'], message_dict['to'], message_dict['message_id'], bounced_email, bounced_msg_ids)
        else:
            _logger.info('Routing mail from %s to %s with Message-Id %s: not routing bounce email.',
                         message_dict['email_from'], message_dict['to'], message_dict['message_id'])

    @api.model
    def _routing_check_route(self, message, message_dict, route, raise_exception=True):
        """ Verify route validity. Check and rules:
            1 - if thread_id -> check that document effectively exists; otherwise
                fallback on a message_new by resetting thread_id
            2 - check that message_update exists if thread_id is set; or at least
                that message_new exist
            3 - if there is an alias, check alias_contact:
                'followers' and thread_id:
                    check on target document that the author is in the followers
                'followers' and alias_parent_thread_id:
                    check on alias parent document that the author is in the
                    followers
                'partners': check that author_id id set

        :param message: an email.message instance
        :param message_dict: dictionary of values that will be given to
                             mail_message.create()
        :param route: route to check which is a tuple (model, thread_id,
                      custom_values, uid, alias)
        :param raise_exception: if an error occurs, tell whether to raise an error
                                or just log a warning and try other processing or
                                invalidate route
        """

        assert isinstance(route, (list, tuple)), 'A route should be a list or a tuple'
        assert len(route) == 5, 'A route should contain 5 elements: model, thread_id, custom_values, uid, alias record'

        message_id = message_dict['message_id']
        email_from = message_dict['email_from']
        author_id = message_dict.get('author_id')
        model, thread_id, alias = route[0], route[1], route[4]
        record_set = None

        # Wrong model
        if not model:
            self._routing_warn(_('target model unspecified'), message_id, route, raise_exception)
            return ()
        elif model not in self.env:
            self._routing_warn(_('unknown target model %s', model), message_id, route, raise_exception)
            return ()
        record_set = self.env[model].browse(thread_id) if thread_id else self.env[model]

        # Existing Document: check if exists and model accepts the mailgateway; if not, fallback on create if allowed
        if thread_id:
            if not record_set.exists():
                self._routing_warn(
                    _('reply to missing document (%(model)s,%(thread)s), fall back on document creation', model=model, thread=thread_id),
                    message_id,
                    route,
                    False
                )
                thread_id = None
            elif not hasattr(record_set, 'message_update'):
                self._routing_warn(_('reply to model %s that does not accept document update, fall back on document creation', model), message_id, route, False)
                thread_id = None

        # New Document: check model accepts the mailgateway
        if not thread_id and model and not hasattr(record_set, 'message_new'):
            self._routing_warn(_('model %s does not accept document creation', model), message_id, route, raise_exception)
            return ()

        # Update message author. We do it now because we need it for aliases (contact settings)
        if not author_id:
            if record_set:
                authors = self._mail_find_partner_from_emails([email_from], records=record_set)
            elif alias and alias.alias_parent_model_id and alias.alias_parent_thread_id:
                records = self.env[alias.alias_parent_model_id.model].browse(alias.alias_parent_thread_id)
                authors = self._mail_find_partner_from_emails([email_from], records=records)
            else:
                authors = self._mail_find_partner_from_emails([email_from], records=None)
            if authors:
                message_dict['author_id'] = authors[0].id

        # Alias: check alias_contact settings
        if alias:
            if thread_id:
                obj = record_set[0]
            elif alias.alias_parent_model_id and alias.alias_parent_thread_id:
                obj = self.env[alias.alias_parent_model_id.model].browse(alias.alias_parent_thread_id)
            else:
                obj = self.env[model]
            error = obj._alias_get_error(message, message_dict, alias)
            if error:
                self._routing_warn(
                    _('alias %(name)s: %(error)s', name=alias.alias_name, error=error.message or _('unknown error')),
                    message_id,
                    route,
                    False
                )
                if error.is_config_error:
                    alias._set_alias_invalid(message, message_dict)
                else:
                    body = alias._get_alias_bounced_body(message_dict)
                    self._routing_create_bounce_email(email_from, body, message, references=message_id)
                return False

        return (model, thread_id, route[2], route[3], route[4])

    @api.model
    def _routing_reset_bounce(self, email_message, message_dict):
        """Called by ``message_process`` when a new mail is received from an email address.
        If the email is related to a partner, we consider that the number of message_bounce
        is not relevant anymore as the email is valid - as we received an email from this
        address. The model is here hardcoded because we cannot know with which model the
        incomming mail match. We consider that if a mail arrives, we have to clear bounce for
        each model having bounce count.

        :param email_from: email address that sent the incoming email."""
        valid_email = message_dict['email_from']
        if valid_email:
            bl_models = self.env['ir.model'].sudo().search(['&', ('is_mail_blacklist', '=', True), ('model', '!=', 'mail.thread.blacklist')])
            for model in [bl_model for bl_model in bl_models if bl_model.model in self.env]:  # transient test mode
                self.env[model.model].sudo().search([('message_bounce', '>', 0), ('email_normalized', '=', valid_email)])._message_reset_bounce(valid_email)

    @api.model
    def _detect_loop_sender_domain(self, email_from_normalized):
        """Return the domain to be used to detect duplicated records created by alias.

        :param email_from_normalized: FROM of the incoming email, normalized
        """
        primary_email = self._mail_get_primary_email_field()
        if primary_email:
            return [(primary_email, 'ilike', email_from_normalized)]

        _logger.info('Primary email missing on %s', self._name)

    @api.model
    def _detect_loop_sender(self, message, message_dict, routes):
        """This method returns True if the incoming email should be ignored.

        The goal of this method is to prevent loops which can occur if an auto-replier
        send emails to Odoo.
        """
        email_from = message_dict.get('email_from')
        if not email_from:
            return False

        email_from_normalized = tools.email_normalize(email_from)

        if self.env['mail.gateway.allowed'].sudo().search_count(
           [('email_normalized', '=', email_from_normalized)]):
            return False

        # Detect the email address sent to many emails
        get_param = self.env['ir.config_parameter'].sudo().get_param
        # Period in minutes in which we will look for <mail.mail>
        LOOP_MINUTES = int(get_param('mail.gateway.loop.minutes', 120))
        LOOP_THRESHOLD = int(get_param('mail.gateway.loop.threshold', 20))

        create_date_limit = self.env.cr.now() - datetime.timedelta(minutes=LOOP_MINUTES)

        # Search only once per model
        models = {
            self.env[model]
            for model, thread_id, *__ in routes or []
            if not thread_id  # Reply to an existing thread
        }

        for model in models:
            if not hasattr(model, '_detect_loop_sender_domain'):
                continue

            domain = model._detect_loop_sender_domain(email_from_normalized)
            if not domain:
                continue

            mail_incoming_messages_count = model.sudo().search_count(
                expression.AND([
                    [('create_date', '>', create_date_limit)],
                    domain,
                ]),
            )

            if mail_incoming_messages_count >= LOOP_THRESHOLD:
                _logger.info('Email address %s created too many <%s>.', email_from, model)

                body = self.env['ir.qweb']._render(
                    'mail.message_notification_limit_email',
                    {'email': message_dict.get('to')},
                    minimal_qcontext=True,
                    raise_if_not_found=False,
                )

                # Add a reference with a tag, to be able to ignore response to this email
                references = (
                    message_dict.get('message_id', '') + ' '
                    + tools.generate_tracking_message_id('loop-detection-bounce-email')
                )
                self._routing_create_bounce_email(email_from, body, message, references=references)
                return True

        return False

    @api.model
    def _detect_loop_headers(self, msg_dict):
        """Return True if the email must be ignored based on its headers."""
        if ('-loop-detection-bounce-email@' in msg_dict.get('references', '')
           or '-loop-detection-bounce-email@' in msg_dict.get('in_reply_to', '')):
            _logger.info('Email is a reply to the bounce notification, ignoring it.')
            return True

        return False

    @api.model
    def message_route(self, message, message_dict, model=None, thread_id=None, custom_values=None):
        """ Attempt to figure out the correct target model, thread_id,
        custom_values and user_id to use for an incoming message.
        Multiple values may be returned, if a message had multiple
        recipients matching existing mail.aliases, for example.

        The following heuristics are used, in this order:

         * if the message replies to an existing thread by having a Message-Id
           that matches an existing mail_message.message_id, we take the original
           message model/thread_id pair and ignore custom_value as no creation will
           take place;
         * look for a mail.alias entry matching the message recipients and use the
           corresponding model, thread_id, custom_values and user_id. This could
           lead to a thread update or creation depending on the alias;
         * fallback on provided ``model``, ``thread_id`` and ``custom_values``;
         * raise an exception as no route has been found

        :param string message: an email.message instance
        :param dict message_dict: dictionary holding parsed message variables
        :param string model: the fallback model to use if the message does not match
            any of the currently configured mail aliases (may be None if a matching
            alias is supposed to be present)
        :type dict custom_values: optional dictionary of default field values
            to pass to ``message_new`` if a new record needs to be created.
            Ignored if the thread record already exists, and also if a matching
            mail.alias was found (aliases define their own defaults)
        :param int thread_id: optional ID of the record/thread from ``model`` to
            which this mail should be attached. Only used if the message does not
            reply to an existing thread and does not match any mail alias.
        :return: list of routes [(model, thread_id, custom_values, user_id, alias)]

        :raises: ValueError, TypeError
        """
        if not isinstance(message, EmailMessage):
            raise TypeError('message must be an email.message.EmailMessage at this point')
        catchall_alias = self.env['ir.config_parameter'].sudo().get_param("mail.catchall.alias")
        fallback_model = model

        # get email.message.Message variables for future processing
        message_id = message_dict['message_id']

        # compute references to find if message is a reply to an existing thread
        thread_references = message_dict['references'] or message_dict['in_reply_to']
        msg_references = [
            re.sub(r'[\r\n\t ]+', r'', ref)  # "Unfold" buggy references
            for ref in tools.mail_header_msgid_re.findall(thread_references)
            if 'reply_to' not in ref
        ]
        mail_messages = self.env['mail.message'].sudo().search([('message_id', 'in', msg_references)], limit=1, order='id desc, message_id')
        is_a_reply = bool(mail_messages)
        reply_model, reply_thread_id = mail_messages.model, mail_messages.res_id

        # author and recipients
        email_from = message_dict['email_from']
        email_to = message_dict['to']
        email_to_localparts = [
            e.split('@', 1)[0].lower()
            for e in (tools.email_split(email_to) or [''])
        ]
        # Delivered-To is a safe bet in most modern MTAs, but we have to fallback on To + Cc values
        # for all the odd MTAs out there, as there is no standard header for the envelope's `rcpt_to` value.
        rcpt_tos_localparts = [
            e.split('@')[0].lower()
            for e in tools.email_split(message_dict['recipients'])
        ]
        rcpt_tos_valid_localparts = [to for to in rcpt_tos_localparts]

        # Handle bounce: verify whether this is a bounced email and use it to collect bounce data and update notifications for customers
        if message_dict.get('is_bounce'):
            self._routing_handle_bounce(message, message_dict)
            return []
        self._routing_reset_bounce(message, message_dict)

        # 1. Handle reply
        #    if destination = alias with different model -> consider it is a forward and not a reply
        #    if destination = alias with same model -> check contact settings as they still apply
        if reply_model and reply_thread_id:
            reply_model_id = self.env['ir.model']._get_id(reply_model)
            other_model_aliases = self.env['mail.alias'].search([
                '&', '&',
                ('alias_name', '!=', False),
                ('alias_name', 'in', email_to_localparts),
                ('alias_model_id', '!=', reply_model_id),
            ])
            if other_model_aliases:
                is_a_reply = False
                rcpt_tos_valid_localparts = [to for to in rcpt_tos_valid_localparts if to in other_model_aliases.mapped('alias_name')]

        if is_a_reply:
            reply_model_id = self.env['ir.model']._get_id(reply_model)
            dest_aliases = self.env['mail.alias'].search([
                ('alias_name', 'in', rcpt_tos_localparts),
                ('alias_model_id', '=', reply_model_id)
            ], limit=1)

            user_id = self._mail_find_user_for_gateway(email_from, alias=dest_aliases).id or self._uid
            route = self._routing_check_route(
                message, message_dict,
                (reply_model, reply_thread_id, custom_values, user_id, dest_aliases),
                raise_exception=False)
            if route:
                _logger.info(
                    'Routing mail from %s to %s with Message-Id %s: direct reply to msg: model: %s, thread_id: %s, custom_values: %s, uid: %s',
                    email_from, email_to, message_id, reply_model, reply_thread_id, custom_values, self._uid)
                return [route]
            elif route is False:
                return []

        # 2. Handle new incoming email by checking aliases and applying their settings
        if rcpt_tos_localparts:
            # no route found for a matching reference (or reply), so parent is invalid
            message_dict.pop('parent_id', None)

            # check it does not directly contact catchall
            if catchall_alias and email_to_localparts and all(email_localpart == catchall_alias for email_localpart in email_to_localparts):
                _logger.info('Routing mail from %s to %s with Message-Id %s: direct write to catchall, bounce', email_from, email_to, message_id)
                body = self.env['ir.qweb']._render('mail.mail_bounce_catchall', {
                    'message': message,
                })
                self._routing_create_bounce_email(email_from, body, message, references=message_id, reply_to=self.env.company.email)
                return []

            dest_aliases = self.env['mail.alias'].search([('alias_name', 'in', rcpt_tos_valid_localparts)])
            if dest_aliases:
                routes = []
                for alias in dest_aliases:
                    user_id = self._mail_find_user_for_gateway(email_from, alias=alias).id or self._uid
                    route = (alias.sudo().alias_model_id.model, alias.alias_force_thread_id, ast.literal_eval(alias.alias_defaults), user_id, alias)
                    route = self._routing_check_route(message, message_dict, route, raise_exception=True)
                    if route:
                        _logger.info(
                            'Routing mail from %s to %s with Message-Id %s: direct alias match: %r',
                            email_from, email_to, message_id, route)
                        routes.append(route)
                return routes

        # 3. Fallback to the provided parameters, if they work
        if fallback_model:
            # no route found for a matching reference (or reply), so parent is invalid
            message_dict.pop('parent_id', None)
            user_id = self._mail_find_user_for_gateway(email_from).id or self._uid
            route = self._routing_check_route(
                message, message_dict,
                (fallback_model, thread_id, custom_values, user_id, None),
                raise_exception=True)
            if route:
                _logger.info(
                    'Routing mail from %s to %s with Message-Id %s: fallback to model:%s, thread_id:%s, custom_values:%s, uid:%s',
                    email_from, email_to, message_id, fallback_model, thread_id, custom_values, user_id)
                return [route]

        # ValueError if no routes found and if no bounce occurred
        raise ValueError(
            'No possible route found for incoming message from %s to %s (Message-Id %s:). '
            'Create an appropriate mail.alias or force the destination model.' %
            (email_from, email_to, message_id)
        )

    @api.model
    def _message_route_process(self, message, message_dict, routes):
        self = self.with_context(attachments_mime_plainxml=True) # import XML attachments as text
        # postpone setting message_dict.partner_ids after message_post, to avoid double notifications
        original_partner_ids = message_dict.pop('partner_ids', [])
        thread_id = False
        for model, thread_id, custom_values, user_id, alias in routes or ():
            subtype_id = False
            related_user = self.env['res.users'].browse(user_id)
            Model = self.env[model].with_context(mail_create_nosubscribe=True, mail_create_nolog=True)
            if not (thread_id and hasattr(Model, 'message_update') or hasattr(Model, 'message_new')):
                raise ValueError(
                    "Undeliverable mail with Message-Id %s, model %s does not accept incoming emails" %
                    (message_dict['message_id'], model)
                )

            # disabled subscriptions during message_new/update to avoid having the system user running the
            # email gateway become a follower of all inbound messages
            ModelCtx = Model.with_user(related_user).sudo()
            if thread_id and hasattr(ModelCtx, 'message_update'):
                thread = ModelCtx.browse(thread_id)
                thread.message_update(message_dict)
            else:
                # if a new thread is created, parent is irrelevant
                message_dict.pop('parent_id', None)
                # Report failure/record success of message creation except if alias is not defined (fallback model case)
                try:
                    thread = ModelCtx.message_new(message_dict, custom_values)
                except Exception:
                    if alias:
                        with self.pool.cursor() as new_cr:
                            self.with_env(self.env(cr=new_cr)).env['mail.alias'].browse(alias.id) \
                                ._set_alias_invalid(message, message_dict)
                    raise
                else:
                    if alias and alias.alias_status != 'valid':
                        alias.alias_status = 'valid'
                thread_id = thread.id
                subtype_id = thread._creation_subtype().id

            # replies to internal message are considered as notes, but parent message
            # author is added in recipients to ensure they are notified of a private answer
            parent_message = False
            if message_dict.get('parent_id'):
                parent_message = self.env['mail.message'].sudo().browse(message_dict['parent_id'])
            partner_ids = []
            if not subtype_id:
                if message_dict.get('is_internal'):
                    subtype_id = self.env['ir.model.data']._xmlid_to_res_id('mail.mt_note')
                    if parent_message and parent_message.author_id:
                        partner_ids = [parent_message.author_id.id]
                else:
                    subtype_id = self.env['ir.model.data']._xmlid_to_res_id('mail.mt_comment')

            post_params = dict(subtype_id=subtype_id, partner_ids=partner_ids, **message_dict)
            # remove computational values not stored on mail.message and avoid warnings when creating it
            for x in ('from', 'to', 'cc', 'recipients', 'references', 'in_reply_to', 'is_bounce', 'bounced_email', 'bounced_message', 'bounced_msg_ids', 'bounced_partner'):
                post_params.pop(x, None)
            new_msg = False
            if thread._name == 'mail.thread':  # message with parent_id not linked to record
                new_msg = thread.message_notify(**post_params)
            else:
                # parsing should find an author independently of user running mail gateway, and ensure it is not odoobot
                partner_from_found = message_dict.get('author_id') and message_dict['author_id'] != self.env['ir.model.data']._xmlid_to_res_id('base.partner_root')
                thread = thread.with_context(mail_create_nosubscribe=not partner_from_found)
                new_msg = thread.message_post(**post_params)

            if new_msg and original_partner_ids:
                # postponed after message_post, because this is an external message and we don't want to create
                # duplicate emails due to notifications
                new_msg.write({'partner_ids': original_partner_ids})
        return thread_id

    @api.model
    def message_process(self, model, message, custom_values=None,
                        save_original=False, strip_attachments=False,
                        thread_id=None):
        """ Process an incoming RFC2822 email message, relying on
            ``mail.message.parse()`` for the parsing operation,
            and ``message_route()`` to figure out the target model.

            Once the target model is known, its ``message_new`` method
            is called with the new message (if the thread record did not exist)
            or its ``message_update`` method (if it did).

           :param string model: the fallback model to use if the message
               does not match any of the currently configured mail aliases
               (may be None if a matching alias is supposed to be present)
           :param message: source of the RFC2822 message
           :type message: string or xmlrpclib.Binary
           :type dict custom_values: optional dictionary of field values
                to pass to ``message_new`` if a new record needs to be created.
                Ignored if the thread record already exists, and also if a
                matching mail.alias was found (aliases define their own defaults)
           :param bool save_original: whether to keep a copy of the original
                email source attached to the message after it is imported.
           :param bool strip_attachments: whether to strip all attachments
                before processing the message, in order to save some space.
           :param int thread_id: optional ID of the record/thread from ``model``
               to which this mail should be attached. When provided, this
               overrides the automatic detection based on the message
               headers.
        """
        # extract message bytes - we are forced to pass the message as binary because
        # we don't know its encoding until we parse its headers and hence can't
        # convert it to utf-8 for transport between the mailgate script and here.
        if isinstance(message, xmlrpclib.Binary):
            message = bytes(message.data)
        if isinstance(message, str):
            message = message.encode('utf-8')
        message = email.message_from_bytes(message, policy=email.policy.SMTP)

        # parse the message, verify we are not in a loop by checking message_id is not duplicated
        msg_dict = self.message_parse(message, save_original=save_original)
        if strip_attachments:
            msg_dict.pop('attachments', None)

        existing_msg_ids = self.env['mail.message'].search([('message_id', '=', msg_dict['message_id'])], limit=1)
        if existing_msg_ids:
            _logger.info('Ignored mail from %s to %s with Message-Id %s: found duplicated Message-Id during processing',
                         msg_dict.get('email_from'), msg_dict.get('to'), msg_dict.get('message_id'))
            return False

        if self._detect_loop_headers(msg_dict):
            return

        # find possible routes for the message
        routes = self.message_route(message, msg_dict, model, thread_id, custom_values)
        if self._detect_loop_sender(message, msg_dict, routes):
            return

        thread_id = self._message_route_process(message, msg_dict, routes)
        return thread_id

    @api.model
    def message_new(self, msg_dict, custom_values=None):
        """Called by ``message_process`` when a new message is received
           for a given thread model, if the message did not belong to
           an existing thread.
           The default behavior is to create a new record of the corresponding
           model (based on some very basic info extracted from the message).
           Additional behavior may be implemented by overriding this method.

           :param dict msg_dict: a map containing the email details and
                                 attachments. See ``message_process`` and
                                ``mail.message.parse`` for details.
           :param dict custom_values: optional dictionary of additional
                                      field values to pass to create()
                                      when creating the new thread record.
                                      Be careful, these values may override
                                      any other values coming from the message.
           :rtype: int
           :return: the id of the newly created thread object
        """
        data = {}
        if isinstance(custom_values, dict):
            data = custom_values.copy()
        model_fields = self.fields_get()
        name_field = self._rec_name or 'name'
        if name_field in model_fields and not data.get('name'):
            data[name_field] = msg_dict.get('subject', '')

        primary_email = self._mail_get_primary_email_field()
        if primary_email and msg_dict.get('email_from'):
            data[primary_email] = msg_dict['email_from']

        return self.create(data)

    def message_update(self, msg_dict, update_vals=None):
        """Called by ``message_process`` when a new message is received
           for an existing thread. The default behavior is to update the record
           with update_vals taken from the incoming email.
           Additional behavior may be implemented by overriding this
           method.
           :param dict msg_dict: a map containing the email details and
                               attachments. See ``message_process`` and
                               ``mail.message.parse()`` for details.
           :param dict update_vals: a dict containing values to update records
                              given their ids; if the dict is None or is
                              void, no write operation is performed.
        """
        if update_vals:
            self.write(update_vals)
        return True

    def _message_receive_bounce(self, email, partner):
        """Called by ``message_process`` when a bounce email (such as Undelivered
        Mail Returned to Sender) is received for an existing thread. The default
        behavior is to do nothing. This method is meant to be overridden in various
        modules to add some specific behavior like blacklist management or mass
        mailing statistics update. check is an integer  ``message_bounce`` column exists.
        If it is the case, its content is incremented.

        :param string email: email that caused the bounce;
        :param record partner: partner matching the bounced email address, if any;
        """
        pass

    def _message_reset_bounce(self, email):
        """Called by ``message_process`` when an email is considered as not being
        a bounce. The default behavior is to do nothing. This method is meant to
        be overridden in various modules to add some specific behavior like
        blacklist management.

        :param string email: email for which to reset bounce information
        """
        pass

    def _message_parse_extract_payload_postprocess(self, message, payload_dict):
        """ Perform some cleaning / postprocess in the body and attachments
        extracted from the email. Note that this processing is specific to the
        mail module, and should not contain security or generic html cleaning.
        Indeed those aspects should be covered by the html_sanitize method
        located in tools. """
        body, attachments = payload_dict['body'], payload_dict['attachments']
        if not body.strip():
            return {'body': body, 'attachments': attachments}
        try:
            root = lxml.html.fromstring(body)
        except ValueError:
            # In case the email client sent XHTML, fromstring will fail because 'Unicode strings
            # with encoding declaration are not supported'.
            root = lxml.html.fromstring(body.encode('utf-8'))

        postprocessed = False
        to_remove = []
        for node in root.iter():
            if 'o_mail_notification' in (node.get('class') or '') or 'o_mail_notification' in (node.get('summary') or ''):
                postprocessed = True
                if node.getparent() is not None:
                    to_remove.append(node)
            if node.tag == 'img' and node.get('src', '').startswith('cid:'):
                cid = node.get('src').split(':', 1)[1]
                related_attachment = [attach for attach in attachments if attach[2] and attach[2].get('cid') == cid]
                if related_attachment:
                    node.set('data-filename', related_attachment[0][0])
                    postprocessed = True

        for node in to_remove:
            node.getparent().remove(node)
        if postprocessed:
            body = etree.tostring(root, pretty_print=False, encoding='unicode')
        return {'body': body, 'attachments': attachments}

    def _message_parse_extract_payload(self, message, message_dict, save_original=False):
        """Extract body as HTML and attachments from the mail message"""
        attachments = []
        body = ''
        if save_original:
            attachments.append(self._Attachment('original_email.eml', message.as_string(), {}))

        # Be careful, content-type may contain tricky content like in the
        # following example so test the MIME type with startswith()
        #
        # Content-Type: multipart/related;
        #   boundary="_004_3f1e4da175f349248b8d43cdeb9866f1AMSPR06MB343eurprd06pro_";
        #   type="text/html"
        if message.get_content_maintype() == 'text':
            encoding = message.get_content_charset()
            body = message.get_content()
            body = tools.ustr(body, encoding, errors='replace')
            if message.get_content_type() == 'text/plain':
                # text/plain -> <pre/>
                body = tools.append_content_to_html('', body, preserve=True)
        else:
            alternative = False
            mixed = False
            html = ''
            for part in message.walk():
                if message_dict.get('is_bounce') and body:
                    # bounce email, keep only the first body and ignore
                    # the parent email that might be added at the end
                    # (e.g. for outlook / yahoo bounce email)
                    break
                if part.get_content_type() == 'binary/octet-stream':
                    _logger.warning("Message containing an unexpected Content-Type 'binary/octet-stream', assuming 'application/octet-stream'")
                    part.replace_header('Content-Type', 'application/octet-stream')
                if part.get_content_type() == 'multipart/alternative':
                    alternative = True
                if part.get_content_type() == 'multipart/mixed':
                    mixed = True
                if part.get_content_maintype() == 'multipart':
                    continue  # skip container

                filename = part.get_filename()  # I may not properly handle all charsets
                encoding = part.get_content_charset()  # None if attachment

                # 0) Inline Attachments -> attachments, with a third part in the tuple to match cid / attachment
                if filename and part.get('content-id'):
                    inner_cid = part.get('content-id').strip('><')
                    attachments.append(self._Attachment(filename, part.get_content(), {'cid': inner_cid}))
                    continue
                # 1) Explicit Attachments -> attachments
                if filename or part.get('content-disposition', '').strip().startswith('attachment'):
                    attachments.append(self._Attachment(filename or 'attachment', part.get_content(), {}))
                    continue
                # 2) text/plain -> <pre/>
                if part.get_content_type() == 'text/plain' and (not alternative or not body):
                    body = tools.append_content_to_html(body, tools.ustr(part.get_content(),
                                                                         encoding, errors='replace'), preserve=True)
                # 3) text/html -> raw
                elif part.get_content_type() == 'text/html':
                    # mutlipart/alternative have one text and a html part, keep only the second
                    # mixed allows several html parts, append html content
                    append_content = not alternative or (html and mixed)
                    html = tools.ustr(part.get_content(), encoding, errors='replace')
                    if not append_content:
                        body = html
                    else:
                        body = tools.append_content_to_html(body, html, plaintext=False)
                    # we only strip_classes here everything else will be done in by html field of mail.message
                    body = tools.html_sanitize(body, sanitize_tags=False, strip_classes=True)
                # 4) Anything else -> attachment
                else:
                    attachments.append(self._Attachment(filename or 'attachment', part.get_content(), {}))

        return self._message_parse_extract_payload_postprocess(message, {'body': body, 'attachments': attachments})

    def _message_parse_extract_bounce(self, email_message, message_dict):
        """ Parse email and extract bounce information to be used in future
        processing.

        :param email_message: an email.message instance;
        :param message_dict: dictionary holding already-parsed values;

        :return dict: bounce-related values will be added, containing

          * bounced_email: email that bounced (normalized);
          * bounce_partner: res.partner recordset whose email_normalized =
            bounced_email;
          * bounced_msg_ids: list of message_ID references (<...@myserver>) linked
            to the email that bounced;
          * bounced_message: if found, mail.message recordset matching bounced_msg_ids;
        """
        if not isinstance(email_message, EmailMessage):
            raise TypeError('message must be an email.message.EmailMessage at this point')

        email_part = next((part for part in email_message.walk() if part.get_content_type() in {'message/rfc822', 'text/rfc822-headers'}), None)
        if not email_part:
            # In the case of a bounce message (e.g. bounce message of GMX), the "rfc822"
            # email part might not be always present. In that case we fallback to "multipart/report".
            email_part = next(
                (part for part in email_message.walk() if part.get_content_type() == 'multipart/report'),
                None,
            )

        dsn_part = next((part for part in email_message.walk() if part.get_content_type() == 'message/delivery-status'), None)

        bounced_email = False
        bounced_partner = self.env['res.partner'].sudo()
        if dsn_part and len(dsn_part.get_payload()) > 1:
            dsn = dsn_part.get_payload()[1]
            final_recipient_data = tools.decode_message_header(dsn, 'Final-Recipient')
            # old servers may hold void or invalid Final-Recipient header
            if final_recipient_data and ";" in final_recipient_data:
                bounced_email = tools.email_normalize(final_recipient_data.split(';', 1)[1].strip())
            if bounced_email:
                bounced_partner = self.env['res.partner'].sudo().search([('email_normalized', '=', bounced_email)])

        bounced_msg_ids = False
        bounced_message = self.env['mail.message'].sudo()
        if email_part:
            if email_part.get_content_type() == 'text/rfc822-headers':
                # Convert the message body into a message itself
                email_payload = message_from_string(email_part.get_content(), policy=email.policy.SMTP)
            else:
                email_payload = email_part.get_payload()[0]
            bounced_message, bounced_msg_ids = self._get_bounced_message_data(email_payload, message_dict)

        if bounced_message and not bounced_partner and len(bounced_message.notification_ids.res_partner_id) == 1:
            # if the original recipient was not found,
            # try to find the recipient based on parent <mail.message> notification
            bounced_partner = bounced_message.notification_ids.res_partner_id[0]
            bounced_email = bounced_partner.email

        return {
            'bounced_email': bounced_email,
            'bounced_partner': bounced_partner,
            'bounced_msg_ids': bounced_msg_ids,
            'bounced_message': bounced_message,
        }

    def _message_parse_is_bounce(self, message, message_dict):
        """Return True if the given email is a bounce email.

        Bounce alias: if any To contains bounce_alias@domain
        Bounce message (not alias)
            See http://datatracker.ietf.org/doc/rfc3462/?include_text=1
            As all MTA does not respect this RFC (googlemail is one of them),
            we also need to verify if the message come from "mailer-daemon"
        """
        # detection based on email_to
        bounce_alias = self.env['ir.config_parameter'].sudo().get_param("mail.bounce.alias")
        email_to = message_dict['to']
        email_to_localparts = [
            e.split('@', 1)[0].lower()
            for e in (tools.email_split(email_to) or [''])
        ]
        if bounce_alias and any(email == bounce_alias for email in email_to_localparts):
            return True

        email_from = message_dict['email_from']
        email_from_localpart = (tools.email_split(email_from) or [''])[0].split('@', 1)[0].lower()

        # detection based on email_from
        if email_from_localpart == 'mailer-daemon':
            return True

        # detection based on content type
        content_type = message.get_content_type()
        if content_type == 'multipart/report' or 'report-type=delivery-status' in content_type:
            return True

        return False

    @api.model
    def message_parse(self, message, save_original=False):
        """ Parses an email.message.Message representing an RFC-2822 email
        and returns a generic dict holding the message details.

        :param message: email to parse
        :type message: email.message.Message
        :param bool save_original: whether the returned dict should include
            an ``original`` attachment containing the source of the message
        :rtype: dict
        :return: A dict with the following structure, where each field may not
            be present if missing in original message::

            { 'message_id': msg_id,
              'subject': subject,
              'email_from': from,
              'to': to + delivered-to,
              'cc': cc,
              'recipients': delivered-to + to + cc + resent-to + resent-cc,
              'partner_ids': partners found based on recipients emails,
              'body': unified_body,
              'references': references,
              'in_reply_to': in-reply-to,
              'is_bounce': True if it has been detected as a bounce email
              'parent_id': parent mail.message based on in_reply_to or references,
              'is_internal': answer to an internal message (note),
              'date': date,
              'attachments': [('file1', 'bytes'),
                              ('file2', 'bytes')}
            }
        """
        if not isinstance(message, EmailMessage):
            raise ValueError(_('Message should be a valid EmailMessage instance'))
        msg_dict = {'message_type': 'email'}

        message_id = message.get('Message-Id')
        if not message_id:
            # Very unusual situation, be we should be fault-tolerant here
            message_id = "<%s@localhost>" % time.time()
            _logger.debug('Parsing Message without message-id, generating a random one: %s', message_id)
        msg_dict['message_id'] = message_id.strip()

        if message.get('Subject'):
            msg_dict['subject'] = tools.decode_message_header(message, 'Subject')

        email_from = tools.decode_message_header(message, 'From', separator=',')
        email_cc = tools.decode_message_header(message, 'cc', separator=',')
        email_from_list = tools.email_split_and_format(email_from)
        email_cc_list = tools.email_split_and_format(email_cc)
        msg_dict['email_from'] = email_from_list[0] if email_from_list else email_from
        msg_dict['from'] = msg_dict['email_from']  # compatibility for message_new
        msg_dict['cc'] = ','.join(email_cc_list) if email_cc_list else email_cc
        # Delivered-To is a safe bet in most modern MTAs, but we have to fallback on To + Cc values
        # for all the odd MTAs out there, as there is no standard header for the envelope's `rcpt_to` value.
        msg_dict['recipients'] = ','.join(set(formatted_email
            for address in [
                tools.decode_message_header(message, 'Delivered-To', separator=','),
                tools.decode_message_header(message, 'To', separator=','),
                tools.decode_message_header(message, 'Cc', separator=','),
                tools.decode_message_header(message, 'Resent-To', separator=','),
                tools.decode_message_header(message, 'Resent-Cc', separator=',')
            ] if address
            for formatted_email in tools.email_split_and_format(address))
        )
        msg_dict['to'] = ','.join(set(formatted_email
            for address in [
                tools.decode_message_header(message, 'Delivered-To', separator=','),
                tools.decode_message_header(message, 'To', separator=',')
            ] if address
            for formatted_email in tools.email_split_and_format(address))
        )
        partner_ids = [x.id for x in self._mail_find_partner_from_emails(tools.email_split(msg_dict['recipients']), records=self) if x]
        msg_dict['partner_ids'] = partner_ids
        # compute references to find if email_message is a reply to an existing thread
        msg_dict['references'] = tools.decode_message_header(message, 'References')
        msg_dict['in_reply_to'] = tools.decode_message_header(message, 'In-Reply-To').strip()

        if message.get('Date'):
            try:
                date_hdr = tools.decode_message_header(message, 'Date')
                parsed_date = dateutil.parser.parse(date_hdr, fuzzy=True)
                if parsed_date.utcoffset() is None:
                    # naive datetime, so we arbitrarily decide to make it
                    # UTC, there's no better choice. Should not happen,
                    # as RFC2822 requires timezone offset in Date headers.
                    stored_date = parsed_date.replace(tzinfo=pytz.utc)
                else:
                    stored_date = parsed_date.astimezone(tz=pytz.utc)
            except Exception:
                _logger.info('Failed to parse Date header %r in incoming mail '
                             'with message-id %r, assuming current date/time.',
                             message.get('Date'), message_id)
                stored_date = datetime.datetime.now()
            msg_dict['date'] = stored_date.strftime(tools.DEFAULT_SERVER_DATETIME_FORMAT)

        parent_message = self._get_parent_message(msg_dict)
        if parent_message:
            msg_dict['parent_id'] = parent_message.id
            msg_dict['is_internal'] = bool(parent_message.subtype_id and parent_message.subtype_id.internal)

        msg_dict['is_bounce'] = self._message_parse_is_bounce(message, msg_dict)
        msg_dict.update(self._message_parse_extract_payload(message, msg_dict, save_original=save_original))
        if msg_dict['is_bounce']:
            msg_dict.update(self._message_parse_extract_bounce(message, msg_dict))
        return msg_dict

    def _get_bounced_message_data(self, message, message_dict):
        """Find the original <mail.message> and the bounced email references based on an incoming email.

        :param message: The EmailMessage object, part of the incoming email
                First Content type: 'message/rfc822' or 'text/rfc822-headers'
        :param message_dict: The dict values already parsed
        :return:
            A tuple with
            - The <mail.message> (or empty recordset if nothing has been found)
            - The list of references ids used to find the bounced mail message
        """
        reference_ids = []
        headers = ('Message-Id', 'X-Microsoft-Original-Message-ID')
        for header in headers:
            value = tools.decode_message_header(message, header)
            references = tools.mail_header_msgid_re.findall(value)
            reference_ids.extend([reference.strip() for reference in references])

        if reference_ids:
            bounced_message = self.env['mail.message'].search(
                [('message_id', 'in', reference_ids)],
                order='create_date DESC, id DESC', limit=1)

            if bounced_message:
                return bounced_message, reference_ids

        reference_ids.extend(tools.mail_header_msgid_re.findall(message_dict['in_reply_to']))
        reference_ids.extend(tools.mail_header_msgid_re.findall(message_dict['references']))

        if message_dict.get('parent_id'):
            # Parent based on References, In-Reply-To, etc
            # has already been searched (see @_get_parent_message)
            bounced_message = self.env['mail.message'].browse(message_dict['parent_id'])
            return bounced_message, reference_ids

        return self.env['mail.message'], reference_ids

    def _get_parent_message(self, msg_dict):
        """Find the <mail.message> which is the parent of the given email.

        :param msg_dict: The dict values already parsed
        :return: The <mail.message> or None if nothing has been found
        """
        in_reply_to = msg_dict.get('in_reply_to').strip()
        if in_reply_to:
            parent = self.env['mail.message'].search(
                [('message_id', '=', in_reply_to)],
                order='create_date DESC, id DESC', limit=1)
            if parent:
                return parent

        reference_ids = tools.mail_header_msgid_re.findall(msg_dict.get('references') or '')
        if reference_ids:
            parent = self.env['mail.message'].search(
                [('message_id', 'in', [x.strip() for x in reference_ids])],
                order='create_date DESC, id DESC', limit=1)
            if parent:
                return parent

        return None

    # ------------------------------------------------------
    # RECIPIENTS MANAGEMENT TOOLS
    # ------------------------------------------------------

    def _message_add_suggested_recipient(self, result, partner=None, email=None, lang=None, reason=''):
        """ Called by _message_get_suggested_recipients, to add a suggested
            recipient in the result dictionary. The form is :
                partner_id, partner_name<partner_email> or partner_name, lang,
                reason, create_values """
        self.ensure_one()
        if email and not partner:
            # get partner info from email
            partner_info = self._message_partner_info_from_emails([email])[0]
            if partner_info.get('partner_id'):
                partner = self.env['res.partner'].sudo().browse([partner_info['partner_id']])[0]
        if email and email in [val[1] for val in result[self.ids[0]]]:  # already existing email -> skip
            return result
        if partner and partner in self.message_partner_ids:  # recipient already in the followers -> skip
            return result
        if partner and partner.id in [val[0] for val in result[self.ids[0]]]:  # already existing partner ID -> skip
            return result
        if partner and partner.email:  # complete profile: id, name <email>
            result[self.ids[0]].append((partner.id, partner.email_formatted, lang, reason, {}))
        elif partner:  # incomplete profile: id, name
            result[self.ids[0]].append((partner.id, '%s' % (partner.name), lang, reason, {}))
        else:  # unknown partner, we are probably managing an email address
            _, parsed_email = self.env['res.partner']._parse_partner_name(email)
            partner_create_values = self._get_customer_information().get(parsed_email, {})
            result[self.ids[0]].append((False, email, lang, reason, partner_create_values))
        return result

    def _message_get_suggested_recipients(self):
        """ Returns suggested recipients for ids. Those are a list of
        tuple (partner_id, partner_name, reason, default_create_value), to be managed by Chatter. """
        result = dict((res_id, []) for res_id in self.ids)
        if 'user_id' in self._fields:
            for obj in self.sudo():  # SUPERUSER because of a read on res.users that would crash otherwise
                if not obj.user_id or not obj.user_id.partner_id:
                    continue
                obj._message_add_suggested_recipient(result, partner=obj.user_id.partner_id, reason=self._fields['user_id'].string)
        return result

    def _mail_search_on_user(self, normalized_emails, extra_domain=False):
        """ Find partners linked to users, given an email address that will
        be normalized. Search is done as sudo on res.users model to avoid domain
        on partner like ('user_ids', '!=', False) that would not be efficient. """
        domain = [('email_normalized', 'in', normalized_emails)]
        if extra_domain:
            domain = expression.AND([domain, extra_domain])
        partners = self.env['res.users'].sudo().search(domain, order='name ASC').mapped('partner_id')
        # return a search on partner to filter results current user should not see (multi company for example)
        return self.env['res.partner'].search([('id', 'in', partners.ids)])

    def _mail_search_on_partner(self, normalized_emails, extra_domain=False):
        domain = [('email_normalized', 'in', normalized_emails)]
        if extra_domain:
            domain = expression.AND([domain, extra_domain])
        return self.env['res.partner'].search(domain)

    def _mail_find_user_for_gateway(self, email, alias=None):
        """ Utility method to find user from email address that can create documents
        in the target model. Purpose is to link document creation to users whenever
        possible, for example when creating document through mailgateway.

        Heuristic

          * alias owner record: fetch in its followers for user with matching email;
          * find any user with matching emails;
          * try alias owner as fallback;

        Note that standard search order is applied.

        :param str email: will be sanitized and parsed to find email;
        :param mail.alias alias: optional alias. Used to fetch owner followers
          or fallback user (alias owner);
        :param fallback_model: if not alias, related model to check access rights;

        :return res.user user: user matching email or void recordset if none found
        """
        # find normalized emails and exclude aliases (to avoid subscribing alias emails to records)
        normalized_email = tools.email_normalize(email)
        if not normalized_email:
            return self.env['res.users']

        catchall_domain = self.env['ir.config_parameter'].sudo().get_param("mail.catchall.domain")
        if catchall_domain:
            left_part = normalized_email.split('@')[0] if normalized_email.split('@')[1] == catchall_domain.lower() else False
            if left_part:
                if self.env['mail.alias'].sudo().search_count([('alias_name', '=', left_part)]):
                    return self.env['res.users']

        if alias and alias.alias_parent_model_id and alias.alias_parent_thread_id:
            followers = self.env['mail.followers'].search([
                ('res_model', '=', alias.alias_parent_model_id.sudo().model),
                ('res_id', '=', alias.alias_parent_thread_id)]
            ).mapped('partner_id')
        else:
            followers = self.env['res.partner']

        follower_users = self.env['res.users'].search([
            ('partner_id', 'in', followers.ids), ('email_normalized', '=', normalized_email)
        ], limit=1) if followers else self.env['res.users']
        matching_user = follower_users[0] if follower_users else self.env['res.users']
        if matching_user:
            return matching_user

        if not matching_user:
            std_users = self.env['res.users'].sudo().search([('email_normalized', '=', normalized_email)], limit=1, order='name ASC')
            matching_user = std_users[0] if std_users else self.env['res.users']
        if matching_user:
            return matching_user

        if not matching_user and alias and alias.alias_user_id:
            matching_user = alias and alias.alias_user_id
        if matching_user:
            return matching_user

        return matching_user

    @api.model
    def _mail_find_partner_from_emails(self, emails, records=None, force_create=False, extra_domain=False):
        """ Utility method to find partners from email addresses. If no partner is
        found, create new partners if force_create is enabled. Search heuristics

          * 1: check in records (record set) followers if records is mail.thread
               enabled and if check_followers parameter is enabled;
          * 2: search for partners with user;
          * 3: search for partners;

        :param records: record set on which to check followers;
        :param list emails: list of email addresses for finding partner;
        :param boolean force_create: create a new partner if not found

        :return list partners: a list of partner records ordered as given emails.
          If no partner has been found and/or created for a given emails its
          matching partner is an empty record.
        """
        if records and issubclass(type(records), self.pool['mail.thread']):
            followers = records.mapped('message_partner_ids')
        else:
            followers = self.env['res.partner']
        catchall_domain = self.env['ir.config_parameter'].sudo().get_param("mail.catchall.domain")

        # first, build a normalized email list and remove those linked to aliases to avoid adding aliases as partners
        normalized_emails = [tools.email_normalize(contact) for contact in emails if tools.email_normalize(contact)]
        if catchall_domain:
            domain_left_parts = [email.split('@')[0] for email in normalized_emails if email and email.split('@')[1] == catchall_domain.lower()]
            if domain_left_parts:
                found_alias_names = self.env['mail.alias'].sudo().search([('alias_name', 'in', domain_left_parts)]).mapped('alias_name')
                normalized_emails = [email for email in normalized_emails if email.split('@')[0] not in found_alias_names]

        done_partners = [follower for follower in followers if follower.email_normalized in normalized_emails]
        remaining = [email for email in normalized_emails if email not in [partner.email_normalized for partner in done_partners]]

        user_partners = self._mail_search_on_user(remaining, extra_domain=extra_domain)
        done_partners += [user_partner for user_partner in user_partners]
        remaining = [email for email in normalized_emails if email not in [partner.email_normalized for partner in done_partners]]

        partners = self._mail_search_on_partner(remaining, extra_domain=extra_domain)
        done_partners += [partner for partner in partners]
        remaining = [email for email in normalized_emails if email not in [partner.email_normalized for partner in done_partners]]

        # iterate and keep ordering
        partners = []
        for contact in emails:
            normalized_email = tools.email_normalize(contact)
            partner = next((partner for partner in done_partners if partner.email_normalized == normalized_email), self.env['res.partner'])
            if not partner and force_create and normalized_email in normalized_emails:
                partner = self.env['res.partner'].browse(self.env['res.partner'].name_create(contact)[0])
            partners.append(partner)
        return partners

    def _message_partner_info_from_emails(self, emails, link_mail=False):
        """ Convert a list of emails into a list partner_ids and a list
            new_partner_ids. The return value is non conventional because
            it is meant to be used by the mail widget.

            :return dict: partner_ids and new_partner_ids """
        self.ensure_one()
        MailMessage = self.env['mail.message'].sudo()
        partners = self._mail_find_partner_from_emails(emails, records=self)
        result = list()
        for idx, contact in enumerate(emails):
            partner = partners[idx]
            partner_info = {'full_name': partner.email_formatted if partner else contact, 'partner_id': partner.id}
            result.append(partner_info)
            # link mail with this from mail to the new partner id
            if link_mail and partner:
                MailMessage.search([
                    ('email_from', '=ilike', partner.email_normalized),
                    ('author_id', '=', False)
                ]).write({'author_id': partner.id})
        return result


    def _get_customer_information(self):
        """ Get customer information that can be extracted from the records by
        normalized email.

        The goal of this method is to offer an extension point to subclasses
        for retrieving initial values from a record to populate related
        customers record (res_partner).

        :return dict: normalized email -> dict of initial res_partner values
        """
        return {}

    # ------------------------------------------------------------
    # MESSAGE POST MAIN
    # ------------------------------------------------------------

    @api.returns('mail.message', lambda value: value.id)
    def message_post(self, *,
                     body='', subject=None, message_type='notification',
                     email_from=None, author_id=None, parent_id=False,
                     subtype_xmlid=None, subtype_id=False, partner_ids=None,
                     attachments=None, attachment_ids=None,
                     **kwargs):
        """ Post a new message in an existing thread, returning the new mail.message.

        :param str body: body of the message, usually raw HTML that will
            be sanitized
        :param str subject: subject of the message
        :param str message_type: see mail_message.message_type field. Can be anything but
            user_notification, reserved for message_notify
        :param str email_from: from address of the author. See ``_message_compute_author``
            that uses it to make email_from / author_id coherent;
        :param int author_id: optional ID of partner record being the author. See
            ``_message_compute_author`` that uses it to make email_from / author_id coherent;
        :param int parent_id: handle thread formation
        :param str subtype_xmlid: optional xml id of a mail.message.subtype to
          fetch, will force value of subtype_id;
        :param int subtype_id: subtype_id of the message, used mainly for followers
            notification mechanism;
        :param list(int) partner_ids: partner_ids to notify in addition to partners
            computed based on subtype / followers matching;
        :param list(tuple(str,str), tuple(str,str, dict)) attachments : list of attachment
            tuples in the form ``(name,content)`` or ``(name,content, info)`` where content
            is NOT base64 encoded;
        :param list attachment_ids: list of existing attachments to link to this message
            Should not be a list of commands. Attachment records attached to mail
            composer will be attached to the related document.

        Extra keyword arguments will be used either
          * as default column values for the new mail.message record if they match
            mail.message fields;
          * propagated to notification methods if not;

        :return record: newly create mail.message
        """
        self.ensure_one()  # should always be posted on a record, use message_notify if no record

        # preliminary value safety check
        self._raise_for_invalid_parameters(
            set(kwargs.keys()),
            forbidden_names={'model', 'res_id', 'subtype'}
        )
        if self._name == 'mail.thread' or not self.id:
            raise ValueError(_("Posting a message should be done on a business document. Use message_notify to send a notification to an user."))
        if message_type == 'user_notification':
            raise ValueError(_("Use message_notify to send a notification to an user."))
        if attachments:
            # attachments should be a list (or tuples) of 3-elements list (or tuple)
            format_error = not tools.is_list_of(attachments, list) and not tools.is_list_of(attachments, tuple)
            if not format_error:
                format_error = not all(len(attachment) in {2, 3} for attachment in attachments)
            if format_error:
                raise ValueError(
                    _('Posting a message should receive attachments as a list of list or tuples (received %(aids)s)',
                      aids=repr(attachment_ids),
                     )
                )
        if attachment_ids and not tools.is_list_of(attachment_ids, int):
            raise ValueError(
                _('Posting a message should receive attachments records as a list of IDs (received %(aids)s)',
                  aids=repr(attachment_ids),
                 )
            )
        attachment_ids = list(attachment_ids or [])
        if partner_ids and not tools.is_list_of(partner_ids, int):
            raise ValueError(
                _('Posting a message should receive partners as a list of IDs (received %(pids)s)',
                  pids=repr(partner_ids),
                 )
            )
        partner_ids = list(partner_ids or [])

        # split message additional values from notify additional values
        msg_kwargs = {key: val for key, val in kwargs.items()
                      if key in self.env['mail.message']._fields}
        notif_kwargs = {key: val for key, val in kwargs.items()
                        if key not in msg_kwargs}

        # Add lang to context immediately since it will be useful in various flows later
        self = self._fallback_lang()

        # Find the message's author
        if self.env.user._is_public() and 'guest' in self.env.context:
            author_guest_id = self.env.context['guest'].id
            author_id, email_from = False, False
        else:
            author_guest_id = False
            author_id, email_from = self._message_compute_author(author_id, email_from, raise_on_email=True)

        if subtype_xmlid:
            subtype_id = self.env['ir.model.data']._xmlid_to_res_id(subtype_xmlid)
        if not subtype_id:
            subtype_id = self.env['ir.model.data']._xmlid_to_res_id('mail.mt_note')

        # automatically subscribe recipients if asked to
        if self._context.get('mail_post_autofollow') and partner_ids:
            self.message_subscribe(partner_ids=list(partner_ids))

        msg_values = dict(msg_kwargs)
        if 'email_add_signature' not in msg_values:
            msg_values['email_add_signature'] = True
        if not msg_values.get('record_name'):
            msg_values['record_name'] = self.display_name
        msg_values.update({
            # author
            'author_id': author_id,
            'author_guest_id': author_guest_id,
            'email_from': email_from,
            # document
            'model': self._name,
            'res_id': self.id,
            # content
            'body': body,
            'message_type': message_type,
            'parent_id': self._message_compute_parent_id(parent_id),
            'subject': subject or False,
            'subtype_id': subtype_id,
            # recipients
            'partner_ids': partner_ids,
        })

        msg_values.update(
            self._process_attachments_for_post(attachments, attachment_ids, msg_values)
        )  # attachement_ids, body
        new_message = self._message_create([msg_values])

        # subscribe author(s) so that they receive answers; do it only when it is
        # a manual post by the author (aka not a system notification, not a message
        # posted 'in behalf of', and if still active).
        author_subscribe = (not self._context.get('mail_create_nosubscribe') and
                             msg_values['message_type'] != 'notification')
        if author_subscribe:
            real_author_id = False
            # if current user is active, they are the one doing the action and should
            # be notified of answers. If they are inactive they are posting on behalf
            # of someone else (a custom, mailgateway, ...) and the real author is the
            # message author
            if self.env.user.active:
                real_author_id = self.env.user.partner_id.id
            elif msg_values['author_id']:
                author = self.env['res.partner'].browse(msg_values['author_id'])
                if author.active:
                    real_author_id = author.id
            if real_author_id:
                self._message_subscribe(partner_ids=[real_author_id])

        self._message_post_after_hook(new_message, msg_values)
        self._notify_thread(new_message, msg_values, **notif_kwargs)
        return new_message

    def _message_post_after_hook(self, message, msg_values):
        """ Hook to add custom behavior after having posted the message. Both
        message and computed value are given, to try to lessen query count by
        using already-computed values instead of having to rebrowse things. """

    def _message_mail_after_hook(self, mails):
        """ Hook to add custom behavior after having sent an mass mailing.

        :param mail.mail mails: mail.mail records about to be sent"""
        return

    def _process_attachments_for_post(self, attachments, attachment_ids, message_values):
        """ Preprocess attachments for MailTread.message_post() or MailMail.create().
        Purpose is to

          * transfer attachments given by ``attachment_ids`` from the composer
            to the record (if any);
          * limit attachments manipulation when being a shared user: only those
            created by the user and linked to the composer are considered;
          * create attachments from ``attachments``. If those are linked to the
            content (body) through CIDs body is updated. CIDs are found and
            replaced by links to web/image as CIDs are not supported as it.

        :param list(tuple(str,str)) or list(tuple(str,str, dict)) attachments:
          list of attachment tuples in the form ``(name,content)`` or
          `(name,content, info)`` where content is NOT base64 encoded;
        :param list attachment_ids: list of existing attachments to link to this
          message;
        :param message_values: dictionary of values that will be used to create the
          message. It is used to find back record- or content- context;

        :return dict: new values for message: 'attachment_ids' and optionally
          'body' if CIDs have been transformed;
        """
        # allow calling as a model method using model/res_id
        if 'res_id' in message_values:
            model, res_id = message_values['model'], message_values['res_id']
        else:
            self.ensure_one()
            model, res_id = self._name, self.id
        body = ''
        if message_values.get('body'):
            body = message_values['body'] if not is_html_empty(message_values['body']) else ''

        m2m_attachment_ids = []
        if attachment_ids:
            # taking advantage of cache looks better in this case, to check
            filtered_attachment_ids = self.env['ir.attachment'].sudo().browse(attachment_ids).filtered(
                lambda a: a.res_model == 'mail.compose.message' and a.create_uid.id == self._uid)
            # update filtered (pending) attachments to link them to the proper record
            if filtered_attachment_ids:
                filtered_attachment_ids.write({'res_model': model, 'res_id': res_id})
            # prevent public and portal users from using attachments that are not theirs
            if not self.env.user._is_internal():
                attachment_ids = filtered_attachment_ids.ids

            m2m_attachment_ids += [Command.link(id) for id in attachment_ids]

        # Handle attachments parameter, that is a dictionary of attachments
        return_values = {}
        if attachments: # generate
            body_cids, body_filenames = set(), set()
            if body:
                root = lxml.html.fromstring(tools.ustr(body))
                # first list all attachments that will be needed in body
                for node in root.iter('img'):
                    if node.get('src', '').startswith('cid:'):
                        body_cids.add(node.get('src').split('cid:')[1])
                    elif node.get('data-filename'):
                        body_filenames.add(node.get('data-filename'))

            attachement_values_list = []
            attachement_extra_list = []
            # generate values
            for attachment in attachments:
                if len(attachment) == 2:
                    name, content = attachment
                    cid = False
                elif len(attachment) == 3:
                    name, content, info = attachment
                    cid = info and info.get('cid')
                else:
                    continue

                if isinstance(content, str):
                    content = content.encode('utf-8')
                elif isinstance(content, EmailMessage):
                    content = content.as_bytes()
                elif content is None:
                    continue
                attachement_values = {
                    'name': name,
                    'datas': base64.b64encode(content),
                    'type': 'binary',
                    'description': name,
                    'res_model': model,
                    'res_id': res_id,
                }
                token = False
                if (cid and cid in body_cids) or (name and name in body_filenames):
                    token = self.env['ir.attachment']._generate_access_token()
                    attachement_values['access_token'] = token
                attachement_values_list.append(attachement_values)

                # keep cid, name list and token synced with attachement_values_list length to match ids latter
                attachement_extra_list.append((cid, name, token))

            new_attachments = self.env['ir.attachment'].create(attachement_values_list)
            attach_cid_mapping, attach_name_mapping = {}, {}
            for attachment, (cid, name, token) in zip(new_attachments, attachement_extra_list):
                if cid:
                    attach_cid_mapping[cid] = (attachment.id, token)
                if name:
                    attach_name_mapping[name] = (attachment.id, token)
                m2m_attachment_ids.append((4, attachment.id))

            # note: right know we are only taking attachments and ignoring attachment_ids.
            if (body_cids or body_filenames) and body:
                postprocessed = False
                for node in root.iter('img'):
                    att_id, token = False, False
                    if node.get('src', '').startswith('cid:'):
                        cid = node.get('src').split('cid:')[1]
                        att_id, token = attach_cid_mapping.get(cid, (False, False))
                    if (not att_id or not token) and node.get('data-filename'):
                        att_id, token = attach_name_mapping.get(node.get('data-filename'), (False, False))
                    if att_id and token:
                        node.set('src', f'/web/image/{att_id}?access_token={token}')
                        postprocessed = True
                if postprocessed:
                    return_values['body'] = lxml.html.tostring(root, pretty_print=False, encoding='UTF-8')
        return_values['attachment_ids'] = m2m_attachment_ids
        return return_values

    def _process_attachments_for_template_post(self, mail_template):
        """ Model specific management of attachments used with template attachments
        generation in addition to reports. Only usage currently is for EDI in
        accounting.

        :param mail.template mail_template: a mail.template record used to generate
          message or emails on self;

        :return dict: a dictionary based on self.ids (optional). For each given
          key, value should be a dict holding 'attachments' and 'attachment_ids'
          keys;
        """
        return {}

    # ------------------------------------------------------------
    # MESSAGE POST API / WRAPPERS
    # ------------------------------------------------------------

    def message_mail_with_source(self, source_ref, render_values=None,
                                 message_type='notification',
                                 auto_commit=False,
                                 **kwargs):
        """ Send a mass mail on self, using an external source to render part
        of the content. It can be either a 'mail.template', either a view used
        to render the body using QWeb.

        SPOILER: this method currently calls a composer in a loop when using
        a view even if it is suboptimal. This is due to current composer
        implementation.. This will be cleaned soon to  optimize mass mailing
        through mail.thread and lessen usage of composer itself.

        Default values
          * subtype_id: will be False, forced by composer in mass mode;

        :param record/str source_ref: reference to a source for rendering.
          It can be one of
            * a MailTemplate record. It will be used to render the various
              message values (body, subject, recipients, ...). It should behave
              like using the mail composer with a template;
            * an IrUIView record. It will be used to render the content
              (body). Other fields are left to the caller and/or default values
              computation;
            * an XmlID of a MailTemplate or of an IrUiView: see above;
        :param dict render_values: additional rendering values for qweb context;

        :param str message_type: one of 'notification' or 'comment';
        :param bool auto_commit: auto commit after each batch of emails sent
          (see ``MailComposer._action_send_mail()``);
        :param dict kwargs: additional values given to the 'mail.compose.message'
          creation;

        :return: created mail.mail records, as sudo
        """
        template, view = self._get_source_from_ref(source_ref)

        # preliminary value safety check
        self._raise_for_invalid_parameters(
            set(kwargs.keys()),
            forbidden_names={'body', 'composition_mode', 'model', 'res_id', 'values'}
        )

        # with a view, render bodies in batch (template is managed by composer)
        bodies = self.env['mail.render.mixin']._render_template_qweb_view(
            view,
            self._name,
            self.ids,
            add_context=render_values,
        ) if view else {}

        # Prepare composer values for creation
        composer_values = {
            'composition_mode': 'mass_mail',
            'message_type': message_type,
            # subtype is not really used in mass mail mode as it is used mainly
            # when posting, but keep it in case it is used in post send
            'subtype_id': kwargs.pop('subtype_id', False) or self.env['ir.model.data']._xmlid_to_res_id('mail.mt_note'),
            **kwargs,
        }
        composer_ctx = {
            'default_composition_mode': 'mass_mail',
            'default_model': self._name,
            'default_template_id': template.id if template else False,
        }

        mails_su = self.env['mail.mail'].sudo()
        for subset in [self] if template else self:
            composer_ctx['default_res_ids'] = subset.ids
            if not template:
                composer_values['body'] = bodies[subset.id]

            composer = self.env['mail.compose.message'].with_context(
                **composer_ctx
            ).create(composer_values)
            mails_as_sudo, _messages = composer._action_send_mail(auto_commit=auto_commit)
            mails_su += mails_as_sudo
        return mails_su

    def message_post_with_source(self, source_ref, render_values=None,
                                 message_type='notification',
                                 subtype_xmlid=False, subtype_id=False,
                                 **kwargs):
        """ Post a message on each record of self, using a view to render the
        body using QWeb.

        Default values
          * subtype_id: if not given, fallback on ``note`` to be consistent
            with what message_post does;

        :param record/str source_ref: reference to a source for rendering.
          It can be one of
            * a MailTemplate record. It will be used to render the various
              message values (body, subject, recipients, ...). It should behave
              like using the mail composer with a template;
            * an IrUIView record. It will be used to render the content
              (body). Other fields are left to the caller and/or default values
              computation;
            * an XmlID of a MailTemplate or of an IrUiView: see above
        :param dict render_values: additional rendering values for qweb context;

        :param str message_type: one of 'notification' or 'comment';
        :param str subtype_xmlid: optional xml id of a mail.message.subtype to
          fetch, will force value of subtype_id;
        :param int subtype_id: subtype_id of the message, used mainly for followers
            notification mechanism;
        :param dict kwargs: additional values given to the 'mail.compose.message'
          creation;

        :return: posted mail.message records
        """
        template, view = self._get_source_from_ref(source_ref)

        # preliminary value safety check
        self._raise_for_invalid_parameters(
            set(kwargs.keys()),
            forbidden_names={'body', 'composition_mode', 'model', 'res_id', 'values'}
        )

        # with a view, render bodies in batch (template is managed by composer)
        bodies = self.env['mail.render.mixin']._render_template_qweb_view(
            view,
            self._name,
            self.ids,
            add_context=render_values,
        ) if view else {}

        # Prepare composer values for creation
        if subtype_xmlid:
            subtype_id = self.env['ir.model.data']._xmlid_to_res_id(subtype_xmlid)
        if not subtype_id:
            subtype_id = self.env['ir.model.data']._xmlid_to_res_id('mail.mt_note')

        messages_all = self.env['mail.message']
        for record in self:
            if template:
                composer = self.env['mail.compose.message'].with_context(
                    default_composition_mode='comment',
                    default_model=self._name,
                    default_res_ids=record.ids,
                    default_template_id=template.id,
                ).create({
                    'message_type': message_type,
                    'subtype_id': subtype_id,
                    **kwargs,
                })
                _mails_as_sudo, messages = composer._action_send_mail()
                messages_all += messages
            else:
                messages_all += record.message_post(
                    body=bodies[record.id],
                    message_type=message_type,
                    subtype_id=subtype_id,
                    **kwargs
                )
        return messages_all

    @api.returns('mail.message', lambda value: value.id)
    def message_notify(self, *,
                       body='', subject=False,
                       author_id=None, email_from=None,
                       model=False, res_id=False,
                       subtype_xmlid=None, subtype_id=False, partner_ids=False,
                       attachments=None, attachment_ids=None,
                       **kwargs):
        """ Shortcut allowing to notify partners of messages that should not be
        displayed on a document. It pushes notifications on inbox or by email
        depending on the user configuration, like other notifications.

        Default values
          * subtype_id: if not given, fallback on ``note`` to be consistent
            with what message_post does;

        :param str body: body of the message, usually raw HTML that will
          be sanitized
        :param str subject: subject of the message
        :param int author_id: optional ID of partner record being the author. See
          ``_message_compute_author`` that uses it to make email_from / author_id coherent;
        :param str email_from: from address of the author. See ``_message_compute_author``
          that uses it to make email_from / author_id coherent;
        :param str model: when invoked on MailThread directly, this method
          allows to push a notification on a given record (allows to notify
          on not thread-enabled records);
        :param int res_id: defines the record in combination with model;
        :param str subtype_xmlid: optional xml id of a mail.message.subtype to
          fetch, will force value of subtype_id;
        :param int subtype_id: subtype_id of the message, used mainly for followers
          notification mechanism;
        :param list(int) partner_ids: partner_ids to notify in addition to partners
            computed based on subtype / followers matching;
        :param list(tuple(str,str), tuple(str,str, dict)) attachments : list of attachment
            tuples in the form ``(name,content)`` or ``(name,content, info)`` where content
            is NOT base64 encoded;
        :param list attachment_ids: list of existing attachments to link to this message
            Should not be a list of commands. Attachment records attached to mail
            composer will be attached to the related document.

        Extra keyword arguments will be used either
          * as default column values for the new mail.message record if they match
            mail.message fields;
          * propagated to notification methods if not;

        :return: posted mail.message records
        """
        if self:
            self.ensure_one()
        if not partner_ids:
            _logger.warning('Message notify called without recipient_ids, skipping')
            return self.env['mail.message']

        # preliminary value safety check
        self._raise_for_invalid_parameters(
            set(kwargs.keys()),
            forbidden_names={'message_id', 'message_type', 'parent_id'}
        )
        if attachments:
            # attachments should be a list (or tuples) of 3-elements list (or tuple)
            format_error = not tools.is_list_of(attachments, list) and not tools.is_list_of(attachments, tuple)
            if not format_error:
                format_error = not all(len(attachment) in {2, 3} for attachment in attachments)
            if format_error:
                raise ValueError(
                    _('Notification should receive attachments as a list of list or tuples (received %(aids)s)',
                      aids=repr(attachment_ids),
                     )
                )
        if attachment_ids and not tools.is_list_of(attachment_ids, int):
            raise ValueError(
                _('Notification should receive attachments records as a list of IDs (received %(aids)s)',
                  aids=repr(attachment_ids),
                 )
            )
        if not tools.is_list_of(partner_ids, int):
            raise ValueError(
                _('Notification should receive partners given as a list of IDs (received %(pids)s)',
                  pids=repr(partner_ids),
                 )
            )

        # split message additional values from notify additional values
        msg_kwargs = {key: val for key, val in kwargs.items() if key in self.env['mail.message']._fields}
        notif_kwargs = {key: val for key, val in kwargs.items() if key not in msg_kwargs}

        author_id, email_from = self._message_compute_author(author_id, email_from, raise_on_email=True)

        # allow to link a notification to a document that does not inherit from
        # MailThread by supporting model / res_id, but then both value should be set
        if not model or not res_id:
            model, res_id = False, False

        if subtype_xmlid:
            subtype_id = self.env['ir.model.data']._xmlid_to_res_id(subtype_xmlid)
        if not subtype_id:
            subtype_id = self.env['ir.model.data']._xmlid_to_res_id('mail.mt_note')

        msg_values = {
            # author
            'author_id': author_id,
            'email_from': email_from,
            # document
            'model': self._name if self else model,
            'record_name': False,
            'res_id': self.id if self else res_id,
            # content
            'body': body,
            'is_internal': True,
            'message_type': 'user_notification',
            'subject': subject,
            'subtype_id': subtype_id,
            # recipients
            'message_id': tools.generate_tracking_message_id('message-notify'),
            'partner_ids': partner_ids,
            # notification
            'email_add_signature': True,
        }
        msg_values.update(msg_kwargs)
        # add default-like values afterwards, to avoid useless queries
        if 'reply_to' not in msg_values:
            msg_values['reply_to'] = self._notify_get_reply_to(default=email_from)[self.id if self else False]

        msg_values.update(
            self._process_attachments_for_post(attachments, attachment_ids, msg_values)
        )  # attachement_ids, body

        new_message = self._message_create([msg_values])
        self._fallback_lang()._notify_thread(new_message, msg_values, **notif_kwargs)
        return new_message

    def _message_log_with_view(self, view_ref, render_values=None,
                               message_type='notification', **kwargs):
        """ Log a message on each record of self, using a view to render the
        body using QWeb.

        :param str/int/record view_ref: source QWeb template. It should be an
          XmlID allowing to fetch an ``ir.ui.view``, or an ID of a view or
          an ``ir.ui.view`` record;
        :param dict render_values: additional rendering values for qweb context;
        :param str message_type: one of 'notification' or 'comment';
        :param kwargs: additional values propagated to ``_message_log``;

        :return: posted mail.message records (as sudo)
        """
        self._raise_for_invalid_parameters(
            set(kwargs.keys()),
            forbidden_names={'body', 'bodies'}
        )

        # with a view, render bodies in batch (template is managed by composer)
        bodies = self.env['mail.render.mixin']._render_template_qweb_view(
            view_ref,
            self._name,
            self.ids,
            add_context=render_values,
        )

        return self._message_log_batch(
            bodies=bodies,
            message_type=message_type,
            **kwargs
        )

    def _message_log(self, *,
                     body='', subject=False,
                     author_id=None, email_from=None,
                     message_type='notification',
                     attachment_ids=False, tracking_value_ids=False):
        """ Shortcut allowing to post note on a document. See ``_message_log_batch``
        for more details. """
        self.ensure_one()

        return self._message_log_batch(
            {self.id: body}, subject=subject,
            author_id=author_id, email_from=email_from,
            message_type=message_type,
            attachment_ids=attachment_ids, tracking_value_ids=tracking_value_ids
        )

    def _message_log_batch(self, bodies, subject=False,
                           author_id=None, email_from=None,
                           message_type='notification',
                           attachment_ids=False, tracking_value_ids=False):
        """ Shortcut allowing to post notes on a batch of documents. It does not
        perform any notification and pre-computes some values to have a short code
        as optimized as possible. This method is private as it does not check
        access rights and perform the message creation as sudo to speedup
        the log process. This method should be called within methods where
        access rights are already granted to avoid privilege escalation.

        :param bodies: dict {record_id: body}

        :return: created messages (as sudo)
        """
        # protect against side-effect prone usage
        if len(self) > 1 and (attachment_ids or tracking_value_ids):
            raise ValueError(_('Batch log cannot support attachments or tracking values on more than 1 document'))

        author_id, email_from = self._message_compute_author(author_id, email_from, raise_on_email=False)

        base_message_values = {
            # author
            'author_id': author_id,
            'email_from': email_from,
            # document
            'model': self._name,
            'record_name': False,
            # content
            'attachment_ids': attachment_ids,
            'message_type': message_type,
            'is_internal': True,
            'subject': subject,
            'subtype_id': self.env['ir.model.data']._xmlid_to_res_id('mail.mt_note'),
            'tracking_value_ids': tracking_value_ids,
            # recipients
            'email_add_signature': False,  # False as no notification -> no need to compute signature
            'message_id': tools.generate_tracking_message_id('message-notify'),  # why? this is all but a notify
            'reply_to': self.env['mail.thread']._notify_get_reply_to(default=email_from)[False],
        }

        values_list = [dict(base_message_values,
                            res_id=record.id,
                            body=bodies.get(record.id, ''))
                       for record in self]
        return self.sudo()._message_create(values_list)

    # ------------------------------------------------------------
    # MAIL.MESSAGE HELPERS
    # ------------------------------------------------------------

    def _message_compute_author(self, author_id=None, email_from=None, raise_on_email=True):
        """ Tool method computing author information for messages. Purpose is
        to ensure maximum coherence between author / current user / email_from
        when sending emails.

        :param raise_on_email: if email_from is not found, raise an UserError

        :return tuple: res.partner ID (may be False or None), email_from
        """
        if author_id is None:
            if email_from:
                author = self._mail_find_partner_from_emails([email_from])[0]
            else:
                author = self.env.user.partner_id
                email_from = author.email_formatted
            author_id = author.id

        if email_from is None:
            if author_id:
                author = self.env['res.partner'].browse(author_id)
                email_from = author.email_formatted

        # superuser mode without author email -> probably public user; anyway we don't want to crash
        if not email_from and raise_on_email and not self.env.su:
            raise exceptions.UserError(_("Unable to send message, please configure the sender's email address."))

        return author_id, email_from

    def _message_compute_parent_id(self, parent_id):
        # parent management, depending on ``_mail_flat_thread``
        # ``_mail_flat_thread`` True: no free message. If no parent, find the first
        # posted message and attach new message to it. If parent, get back to the first
        # ancestor and attach it. We don't keep hierarchy (one level of threading).
        # ``_mail_flat_thread`` False: free message = new thread (think of mailing lists).
        # If parent get up one level to try to flatten threads without completely
        # removing hierarchy.
        MailMessage_sudo = self.env['mail.message'].sudo()
        if self._mail_flat_thread and not parent_id:
            parent_message = MailMessage_sudo.search([('res_id', '=', self.id), ('model', '=', self._name), ('message_type', '!=', 'user_notification')], order="id ASC", limit=1)
            # parent_message searched in sudo for performance, only used for id.
            # Note that with sudo we will match message with internal subtypes.
            parent_id = parent_message.id if parent_message else False
        elif parent_id:
            current_ancestor = MailMessage_sudo.search([('id', '=', parent_id), ('parent_id', '!=', False)])
            if self._mail_flat_thread:
                if current_ancestor:
                    # avoid loops when finding ancestors
                    processed_list = []
                    while (current_ancestor.parent_id and current_ancestor.parent_id not in processed_list):
                        processed_list.append(current_ancestor)
                        current_ancestor = current_ancestor.parent_id
                    parent_id = current_ancestor.id
            else:
                parent_id = current_ancestor.parent_id.id if current_ancestor.parent_id else parent_id
        return parent_id

    def _message_compute_subject(self):
        """ Get the default subject for a message posted in this record's
        discussion thread.

        :return str: default subject """
        self.ensure_one()
        return self.name_get()[0][1]

    def _message_create(self, values_list):
        """ Low-level helper to create mail.message records. It is mainly used
        to hide the cleanup of given values, for mail gateway or helpers."""
        create_values_list = []

        # preliminary value safety check
        self._raise_for_invalid_parameters(
            {key for values in values_list for key in values.keys()},
            restricting_names=self._get_message_create_valid_field_names()
        )

        for values in values_list:
            create_values = dict(values)
            # Avoid warnings about non-existing fields
            for x in ('from', 'to', 'cc', 'canned_response_ids'):
                create_values.pop(x, None)
            create_values['partner_ids'] = [Command.link(pid) for pid in create_values.get('partner_ids', [])]
            create_values_list.append(create_values)

        # remove context, notably for default keys, as this thread method is not
        # meant to propagate default values for messages, only for master records
        return self.env['mail.message'].with_context(
            clean_context(self.env.context)
        ).create(create_values_list)

    def _get_message_create_valid_field_names(self):
        """ Some fields should not be given when creating a mail.message from
        mail.thread main API methods (in addition to some API specific check).
        Those fields are generally used through UI or dedicated methods. We
        therefore give an allowed field names list. """
        return {
            'attachment_ids',
            'author_guest_id',
            'author_id',
            'body',
            'create_date',  # anyway limited to admins
            'date',
            'email_add_signature',
            'email_from',
            'email_layout_xmlid',
            'is_internal',
            'mail_activity_type_id',
            'mail_server_id',
            'message_id',
            'message_type',
            'model',
            'parent_id',
            'partner_ids',
            'record_name',
            'reply_to',
            'reply_to_force_new',
            'res_id',
            'subject',
            'subtype_id',
            'tracking_value_ids',
        }

    def _get_source_from_ref(self, source_ref):
        """ From a source_reference, return either a mail template, either
        an ir ui view.

        :return tuple(template, view): one is a recordset (may be void if
          source_ref is a void recordset, or a singleton), the other one is
          False. Always only one is set, as source is either a template,
          either a view.
        """
        template, view = False, False
        if isinstance(source_ref, models.BaseModel):
            if source_ref._name == 'mail.template':
                template = source_ref
            elif source_ref._name == 'ir.ui.view':
                view = source_ref
            else:
                raise ValueError(
                    _('Invalid template or view source record %(svalue)s, is %(model)s instead',
                       svalue=source_ref,
                       model=source_ref._name,
                    ))
            if not template and not view:
                raise ValueError(
                    _('Mailing or posting with a source should not be called with an empty %(source_type)s',
                      source_type=_('template') if template is not False else _('view'))
                )
        elif isinstance(source_ref, str):
            try:
                res_model, res_id = self.env['ir.model.data']._xmlid_to_res_model_res_id(
                    source_ref,
                    raise_if_not_found=True
                )
            except ValueError as e:
                raise ValueError(
                    _('Invalid template or view source Xml ID %(source_ref)s does not exist anymore',
                      source_ref=source_ref)
                ) from e
            if res_model == 'mail.template':
                template = self.env['mail.template'].browse(res_id)
            elif res_model == 'ir.ui.view':
                view = self.env['ir.ui.view'].browse(res_id)
            else:
                raise ValueError(
                    _('Invalid template or view source reference %(svalue)s, is %(model)s instead',
                       svalue=source_ref,
                       model=res_model,
                    ))
        else:
            raise ValueError(
                _('Invalid template or view source %(svalue)s (type %(stype)s), should be a record or an XMLID',
                  svalue=source_ref,
                  stype=type(source_ref),
                ))
        return template, view

    def _get_notify_valid_parameters(self):
        """ Several parameters exist for notification methods as business
        flows often want to customize the standard notification experience.
        In order to ease coding kwargs are frequently used. This method
        acts like a filter, allowing to spot parameters that are not
        supported. """
        return {
            'force_email_company',
            'force_email_lang',
            'force_send',
            'mail_auto_delete',
            'model_description',
            'notify_author',
            'resend_existing',
            'scheduled_date',
            'send_after_commit',
            'skip_existing',
            'subtitles',
        }

    def _raise_for_invalid_parameters(self, parameter_names, forbidden_names=None, restricting_names=None):
        """ Helper to warn about invalid parameters (or fields).

        :param set parameter_names: a set of parameter names;
        :param set forbidden_names: set of parameter name that should not be
          present in parameter_names;
        :param set restricting_names: set of parameters restricting given
          parameter_names, parameters not belonging to this list are rejected;
        """
        if forbidden_names:
            conflicting_names = parameter_names & forbidden_names
        elif restricting_names:
            conflicting_names = parameter_names - restricting_names
        if conflicting_names:
            raise ValueError(
                _('Those values are not supported when posting or notifying: %(param_names)s',
                  param_names=', '.join(conflicting_names))
            )

    # ------------------------------------------------------
    # NOTIFICATION API
    # ------------------------------------------------------

    def _notify_cancel_by_type_generic(self, notification_type):
        """ Standard implementation for canceling notifications by type that cancels notifications
         * in 'bounce' and 'exception' status
         * of the current user
         * of the given type
         * for mail_message related to the model implemented by this class
         It also sends bus notifications to update status of notifications in the web client.
        """
        author_id = self.env.user.partner_id.id
        self._cr.execute("""
                    SELECT notif.id, msg.id
                      FROM mail_notification notif
                      JOIN mail_message msg ON notif.mail_message_id = msg.id
                      WHERE notif.notification_type = %(notification_type)s
                      AND notif.author_id = %(author_id)s
                      AND notif.notification_status IN ('bounce', 'exception')
                      AND msg.model = %(model_name)s
                """, {'model_name': self._name, 'author_id': author_id, 'notification_type': notification_type})
        records = self._cr.fetchall()
        if records:
            notif_ids, msg_ids = zip(*records)
            msg_ids = list(set(msg_ids))
            if notif_ids:
                self.env['mail.notification'].browse(notif_ids).sudo().write({'notification_status': 'canceled'})
            if msg_ids:
                self.env['mail.message'].browse(msg_ids)._notify_message_notification_update()
        return True

    @api.model
    def notify_cancel_by_type(self, notification_type):
        """ Subclasses must call this method and then
         * either call the standard implementation _notify_cancel_by_type_generic
         * or implements their own logic
        """
        if not self.env.user._is_internal():
            raise exceptions.AccessError(_("Access Denied"))
        self.check_access_rights('read')

        if notification_type == 'email':
            self._notify_cancel_by_type_generic('email')
        return True

    def _notify_thread(self, message, msg_vals=False, **kwargs):
        """ Main notification method. This method basically does two things

         * call ``_notify_get_recipients`` that computes recipients to
           notify based on message record or message creation values if given
           (to optimize performance if we already have data computed);
         * performs the notification process by calling the various notification
           methods implemented;

        :param message: ``mail.message`` record to notify;
        :param msg_vals: dictionary of values used to create the message. If given it
          may be used to access values related to ``message`` without accessing it
          directly. It lessens query count in some optimized use cases by avoiding
          access message content in db;

        Kwargs allow to pass various parameters that are given to sub notification
        methods. See those methods for more details about supported parameters.
        Specific kwargs used in this method:

          * ``scheduled_date``: delay notification sending if set in the future.
            This is done using the ``mail.message.schedule`` intermediate model;

        :return: recipients data (see ``MailThread._notify_get_recipients()``)
        """
        # add lang to context immediately since it will be useful in various rendering later
        self = self._fallback_lang()
        self._raise_for_invalid_parameters(
            set(kwargs.keys()),
            restricting_names=self._get_notify_valid_parameters()
        )

        msg_vals = msg_vals if msg_vals else {}
        recipients_data = self._notify_get_recipients(message, msg_vals, **kwargs)
        if not recipients_data:
            return recipients_data

        # if scheduled for later: add in queue instead of generating notifications
        scheduled_date = kwargs.pop('scheduled_date', None)
        if scheduled_date:
            parsed_datetime = self.env['mail.mail']._parse_scheduled_datetime(scheduled_date)
            scheduled_date = parsed_datetime.replace(tzinfo=None) if parsed_datetime else False
        if scheduled_date and scheduled_date > datetime.datetime.utcnow():
            # send the message notifications at the scheduled date
            self.env['mail.message.schedule'].sudo().create({
                'scheduled_datetime': scheduled_date,
                'mail_message_id': message.id,
                'notification_parameters': json.dumps(kwargs),
            })
        else:
            # generate immediately the <mail.notification>
            # and send the <mail.mail> and the <bus.bus> notifications
            self._notify_thread_by_inbox(message, recipients_data, msg_vals=msg_vals, **kwargs)
            self._notify_thread_by_email(message, recipients_data, msg_vals=msg_vals, **kwargs)

        return recipients_data

    def _notify_thread_by_inbox(self, message, recipients_data, msg_vals=False, **kwargs):
        """ Notification method: inbox. Does two main things :

          * create inbox notifications for users;
          * send bus notifications;

        :param message: ``mail.message`` record to notify;
        :param recipients_data: list of recipients information (based on res.partner
          records), formatted like
            [{'active': partner.active;
              'id': id of the res.partner being recipient to notify;
              'groups': res.group IDs if linked to a user;
              'notif': 'inbox', 'email', 'sms' (SMS App);
              'share': partner.partner_share;
              'type': 'customer', 'portal', 'user;'
             }, {...}].
          See ``MailThread._notify_get_recipients``;
        :param msg_vals: dictionary of values used to create the message. If given it
          may be used to access values related to ``message`` without accessing it
          directly. It lessens query count in some optimized use cases by avoiding
          access message content in db;
        """
        bus_notifications = []
        inbox_pids = [r['id'] for r in recipients_data if r['notif'] == 'inbox']
        if inbox_pids:
            notif_create_values = [{
                'author_id': message.author_id.id,
                'mail_message_id': message.id,
                'notification_status': 'sent',
                'notification_type': 'inbox',
                'res_partner_id': pid,
            } for pid in inbox_pids]
            self.env['mail.notification'].sudo().create(notif_create_values)

            message_format_values = message.message_format(msg_vals=msg_vals)[0]
            for partner_id in inbox_pids:
                bus_notifications.append((self.env['res.partner'].browse(partner_id), 'mail.message/inbox', dict(message_format_values)))
        self.env['bus.bus'].sudo()._sendmany(bus_notifications)

    def _notify_thread_by_email(self, message, recipients_data, msg_vals=False,
                                mail_auto_delete=True,  # mail.mail
                                model_description=False, force_email_company=False, force_email_lang=False,  # rendering
                                resend_existing=False, force_send=True, send_after_commit=True,  # email send
                                subtitles=None, **kwargs):
        """ Method to send email linked to notified messages.

        :param message: ``mail.message`` record to notify;
        :param recipients_data: list of recipients information (based on res.partner
          records), formatted like
            [{'active': partner.active;
              'id': id of the res.partner being recipient to notify;
              'groups': res.group IDs if linked to a user;
              'notif': 'inbox', 'email', 'sms' (SMS App);
              'share': partner.partner_share;
              'type': 'customer', 'portal', 'user;'
             }, {...}].
          See ``MailThread._notify_get_recipients``;
        :param msg_vals: dictionary of values used to create the message. If given it
          may be used to access values related to ``message`` without accessing it
          directly. It lessens query count in some optimized use cases by avoiding
          access message content in db;

        :param mail_auto_delete: delete notification emails once sent;

        :param model_description: model description used in email notification process
          (computed if not given);
        :param force_email_company: see ``_notify_by_email_prepare_rendering_context``;
        :param force_email_lang: see ``_notify_by_email_prepare_rendering_context``;

        :param resend_existing: check for existing notifications to update based on
          mailed recipient, otherwise create new notifications;
        :param force_send: send emails directly instead of using queue;
        :param send_after_commit: if force_send, tells whether to send emails after
          the transaction has been committed using a post-commit hook;
        :param subtitles: optional list that will be set as template value "subtitles"
        """
        partners_data = [r for r in recipients_data if r['notif'] == 'email']
        if not partners_data:
            return True

        model = msg_vals.get('model') if msg_vals else message.model
        model_name = model_description or (self.env['ir.model']._get(model).display_name if model else False) # one query for display name
        recipients_groups_data = self._notify_get_recipients_classify(partners_data, model_name, msg_vals=msg_vals)

        if not recipients_groups_data:
            return True
        force_send = self.env.context.get('mail_notify_force_send', force_send)

        template_values = self._notify_by_email_prepare_rendering_context(
            message, msg_vals=msg_vals, model_description=model_description,
            force_email_company=force_email_company,
            force_email_lang=force_email_lang,
        ) # 10 queries
        if subtitles:
            template_values['subtitles'] = subtitles

        email_layout_xmlid = msg_vals.get('email_layout_xmlid') if msg_vals else message.email_layout_xmlid
        template_xmlid = email_layout_xmlid if email_layout_xmlid else 'mail.mail_notification_layout'
        base_mail_values = self._notify_by_email_get_base_mail_values(message, additional_values={'auto_delete': mail_auto_delete})

        # Clean the context to get rid of residual default_* keys that could cause issues during
        # the mail.mail creation.
        # Example: 'default_state' would refer to the default state of a previously created record
        # from another model that in turns triggers an assignation notification that ends up here.
        # This will lead to a traceback when trying to create a mail.mail with this state value that
        # doesn't exist.
        SafeMail = self.env['mail.mail'].sudo().with_context(clean_context(self._context))
        SafeNotification = self.env['mail.notification'].sudo().with_context(clean_context(self._context))
        emails = self.env['mail.mail'].sudo()

        # loop on groups (customer, portal, user,  ... + model specific like group_sale_salesman)
        notif_create_values = []
        recipients_max = 50
        for recipients_group_data in recipients_groups_data:
            # generate notification email content
            recipients_ids = recipients_group_data.pop('recipients')
            render_values = {**template_values, **recipients_group_data}
            # {company, is_discussion, lang, message, model_description, record, record_name, signature, subtype, tracking_values, website_url}
            # {actions, button_access, has_button_access, recipients}

            mail_body = self.env['ir.qweb']._render(template_xmlid, render_values, minimal_qcontext=True, raise_if_not_found=False, lang=template_values['lang'])
            if not mail_body:
                _logger.warning('QWeb template %s not found or is empty when sending notification emails. Sending without layouting.', template_xmlid)
                mail_body = message.body
            mail_body = self.env['mail.render.mixin']._replace_local_links(mail_body)

            # create email
            for recipients_ids_chunk in split_every(recipients_max, recipients_ids):
                mail_values = self._notify_by_email_get_final_mail_values(
                    recipients_ids_chunk,
                    base_mail_values,
                    additional_values={'body_html': mail_body}
                )
                new_email = SafeMail.create(mail_values)

                if new_email and recipients_ids_chunk:
                    tocreate_recipient_ids = list(recipients_ids_chunk)
                    if resend_existing:
                        existing_notifications = self.env['mail.notification'].sudo().search([
                            ('mail_message_id', '=', message.id),
                            ('notification_type', '=', 'email'),
                            ('res_partner_id', 'in', tocreate_recipient_ids)
                        ])
                        if existing_notifications:
                            tocreate_recipient_ids = [rid for rid in recipients_ids_chunk if rid not in existing_notifications.mapped('res_partner_id.id')]
                            existing_notifications.write({
                                'notification_status': 'ready',
                                'mail_mail_id': new_email.id,
                            })
                    notif_create_values += [{
                        'author_id': message.author_id.id,
                        'is_read': True,  # discard Inbox notification
                        'mail_mail_id': new_email.id,
                        'mail_message_id': message.id,
                        'notification_status': 'ready',
                        'notification_type': 'email',
                        'res_partner_id': recipient_id,
                    } for recipient_id in tocreate_recipient_ids]
                emails += new_email

        if notif_create_values:
            SafeNotification.create(notif_create_values)

        # NOTE:
        #   1. for more than 50 followers, use the queue system
        #   2. do not send emails immediately if the registry is not loaded,
        #      to prevent sending email during a simple update of the database
        #      using the command-line.
        test_mode = getattr(threading.current_thread(), 'testing', False)
        if force_send and len(emails) < recipients_max and (not self.pool._init or test_mode):
            # unless asked specifically, send emails after the transaction to
            # avoid side effects due to emails being sent while the transaction fails
            if not test_mode and send_after_commit:
                email_ids = emails.ids
                dbname = self.env.cr.dbname
                _context = self._context

                @self.env.cr.postcommit.add
                def send_notifications():
                    db_registry = registry(dbname)
                    with db_registry.cursor() as cr:
                        env = api.Environment(cr, SUPERUSER_ID, _context)
                        env['mail.mail'].browse(email_ids).send()
            else:
                emails.send()

        return True

    def _notify_by_email_prepare_rendering_context(self, message, msg_vals=False, model_description=False,
                                                   force_email_company=False, force_email_lang=False):
        """ Prepare rendering context for notification email.

        Signature: if asked a default signature is computed based on author. Either
        it has an user and we use the user's signature. Either we do not find any
        user and we compute a default one based on the author's name.

        Company: either there is one defined on the record (company_id field set
        with a value), either we use env.company. A new parameter allows to force
        its value.

        Lang: when calling this method, ``_fallback_lang`` should already been
        called, or a lang set in context with another way. A wild guess is done
        based on templates to try to retrieve the recipient's language when a flow
        like "send by email" is performed. Lang is used to try to have the
        notification layout in the same language as the email content. A new
        parameter allows to force its value.

        :param msg_vals: dictionary of values used to create the message. If given it
          may be used to access values related to ``message`` without accessing it
          directly. It lessens query count in some optimized use cases by avoiding
          access message content in db;
        :param model_description: model description used in email notification process
          (computed if not given);
        :param force_email_company: res.company record used when rendering notification
          layout. Otherwise computed based on current record;
        :param force_email_lang: lang used when rendering content, used notably to
          compute model name;
        """
        if msg_vals is False:
            msg_vals = {}

        # compute send user and its related signature; try to use self.env.user instead of browsing
        # user_ids if they are the author will give a sudo user, improving access performances and cache usage.
        signature = ''
        email_add_signature = msg_vals.get('email_add_signature') if msg_vals and 'email_add_signature' in msg_vals else message.email_add_signature
        if email_add_signature:
            author = message.env['res.partner'].browse(msg_vals.get('author_id')) if 'author_id' in msg_vals else message.author_id
            author_user = self.env.user if self.env.user.partner_id == author else author.user_ids[0] if author and author.user_ids else False
            if author_user:
                signature = author_user.signature
            elif author.name:
                signature = Markup("<p>-- <br/>%s</p>") % author.name

        if force_email_company:
            company = force_email_company
        else:
            company = self.company_id.sudo() if self and 'company_id' in self and self.company_id else self.env.company
        if company.website:
            website_url = 'http://%s' % company.website if not company.website.lower().startswith(('http:', 'https:')) else company.website
        else:
            website_url = False

        # compute lang in which content was rendered or typed
        lang = False
        if force_email_lang:
            lang = force_email_lang
        elif {'default_template_id', 'default_model', 'default_res_ids'} <= self.env.context.keys():
            # TDE FIXME: this whole brol should be cleaned !
            if msg_vals.get('res_id'):
                res_ids = [msg_vals['res_id']]
            else:
                res_ids = self.env['mail.compose.message']._parse_res_ids(self.env.context['default_res_ids'])
            template = self.env['mail.template'].browse(self.env.context['default_template_id'])
            if res_ids and template and template.lang:
                lang = template._render_lang(res_ids)[res_ids[0]]
        if not lang:
            lang = self.env.context.get('lang')

        # record, model
        if not model_description:
            model = msg_vals.get('model') if 'model' in msg_vals else message.model
            if model:
                model_description = self.env['ir.model'].with_context(lang=lang)._get(model).display_name
        record_name = msg_vals.get('record_name') if 'record_name' in msg_vals else message.record_name

        # tracking
        tracking = []
        if msg_vals.get('tracking_value_ids', True) if msg_vals else bool(self): # could be tracking
            for tracking_value in self.env['mail.tracking.value'].sudo().search([('mail_message_id', '=', message.id)]):
                groups = tracking_value.field_groups
                if not groups or self.env.is_superuser() or self.user_has_groups(groups):
                    tracking.append((tracking_value.field_desc,
                                     tracking_value._get_old_display_value()[0],
                                     tracking_value._get_new_display_value()[0]))

        subtype_id = msg_vals.get('subtype_id') if msg_vals and 'subtype_id' in msg_vals else message.subtype_id.id
        is_discussion = subtype_id == self.env['ir.model.data']._xmlid_to_res_id('mail.mt_comment')

        return {
            # message
            'is_discussion': is_discussion,
            'message': message,
            'subtype': message.subtype_id,
            'tracking_values': tracking,
            # record
            'model_description': model_description,
            'record': self,
            'record_name': record_name,
            'subtitles': [record_name],
            # user / environment
            'company': company,
            'email_add_signature': email_add_signature,
            'lang': lang,
            'signature': signature,
            'website_url': website_url,
            # tools
            'is_html_empty': is_html_empty,
        }

    def _notify_by_email_get_base_mail_values(self, message, additional_values=None):
        """ Add model-specific values to the dictionary used to create the
        notification email. Its base behavior is to compute model-specific
        headers.

        :param dict base_mail_values: base mail.mail values, holding message
        to notify (mail_message_id and its fields), server, references, subject.
        """
        mail_subject = message.subject
        if not mail_subject and self:
            mail_subject = self._message_compute_subject()
        if not mail_subject:
            mail_subject = message.record_name
        if mail_subject:
            # replace new lines by spaces to conform to email headers requirements
            mail_subject = ' '.join(mail_subject.splitlines())

        # compute references: set references to the parent and add current message just to
        # have a fallback in case replies mess with Messsage-Id in the In-Reply-To (e.g. amazon
        # SES SMTP may replace Message-Id and In-Reply-To refers an internal ID not stored in Odoo)
        message_sudo = message.sudo()
        if message_sudo.parent_id:
            references = f'{message_sudo.parent_id.message_id} {message_sudo.message_id}'
        else:
            references = message_sudo.message_id
        # prepare notification mail values
        base_mail_values = {
            'mail_message_id': message.id,
            'mail_server_id': message.mail_server_id.id, # 2 query, check acces + read, may be useless, Falsy, when will it be used?
            'references': references,
            'subject': mail_subject,
        }
        if additional_values:
            base_mail_values.update(additional_values)

        headers = self._notify_by_email_get_headers()
        if headers:
            base_mail_values['headers'] = repr(headers)
        return base_mail_values

    def _notify_by_email_get_final_mail_values(self, recipient_ids, base_mail_values, additional_values=None):
        """ Format email notification recipient values to store on the notification
        mail.mail. Basic method just set the recipient partners as mail_mail
        recipients. Override to generate other mail values like email_to or
        email_cc.
        :param recipient_ids: res.partner recordset to notify
        """
        final_mail_values = dict(base_mail_values)
        final_mail_values['recipient_ids'] = [Command.link(pid) for pid in recipient_ids]
        if additional_values:
            final_mail_values.update(additional_values)
        return final_mail_values

    def _notify_get_recipients(self, message, msg_vals, **kwargs):
        """ Compute recipients to notify based on subtype and followers. This
        method returns data structured as expected for ``_notify_recipients``.

        TDE/XDO TODO: flag rdata directly, with for example r['notif'] = 'ocn_client' and r['needaction']=False
        and correctly override _notify_get_recipients

        Kwargs allow to pass various parameters that are used by sub notification
        methods. See those methods for more details about supported parameters.
        Specific kwargs used in this method:

          * ``notify_author``: allows to notify the author, which is False by
            default as we don't want people to receive their own content. It is
            used notably when impersonating partners or having automated
            notifications send by current user, targeting current user;
          * ``skip_existing``: check existing notifications and skip them in order
            to avoid having several notifications / partner as it would make
            constraints crash. This is disabled by default to optimize speed;

        :return list recipients_data: this is a list of recipients information (see
          ``MailFollowers._get_recipient_data()`` for more details) formatted like
          [{'active': partner.active;
            'id': id of the res.partner;
            'groups': res.group IDs if linked to a user;
            'notif': 'inbox', 'email', 'sms' (SMS App);
            'share': partner.partner_share;
            'type': 'customer', 'portal', 'user;'
           }, {...}]
        """
        msg_sudo = message.sudo()
        # get values from msg_vals or from message if msg_vals doen't exists
        pids = msg_vals.get('partner_ids', []) if msg_vals else msg_sudo.partner_ids.ids
        message_type = msg_vals.get('message_type') if msg_vals else msg_sudo.message_type
        subtype_id = msg_vals.get('subtype_id') if msg_vals else msg_sudo.subtype_id.id
        # is it possible to have record but no subtype_id ?
        recipients_data = []

        res = self.env['mail.followers']._get_recipient_data(self, message_type, subtype_id, pids)[self.id if self else 0]
        if not res:
            return recipients_data

        # notify author of its own messages, False by default
        notify_author = kwargs.get('notify_author') or self.env.context.get('mail_notify_author')
        real_author_id = False
        if not notify_author:
            if self.env.user.active:
                real_author_id = self.env.user.partner_id.id
            elif msg_vals.get('author_id'):
                real_author_id = msg_vals['author_id']
            else:
                real_author_id = message.author_id.id

        for pid, pdata in res.items():
            if pid and pid == real_author_id:
                continue
            if pdata['active'] is False:
                continue
            recipients_data.append(pdata)

        # avoid double notification (on demand due to additional queries)
        if kwargs.pop('skip_existing', False):
            pids = [r['id'] for r in recipients_data]
            if pids:
                existing_notifications = self.env['mail.notification'].sudo().search([
                    ('res_partner_id', 'in', pids),
                    ('mail_message_id', 'in', message.ids)
                ])
                recipients_data = [
                    r for r in recipients_data
                    if r['id'] not in existing_notifications.res_partner_id.ids
                ]

        return recipients_data

    def _notify_get_recipients_groups(self, msg_vals=None):
        """ Return groups used to classify recipients of a notification email.
        Groups is a list of tuple containing of form (group_name, group_func,
        group_data) where
         * group_name is an identifier used only to be able to override and manipulate
           groups. Default groups are user (recipients linked to an employee user),
           portal (recipients linked to a portal user) and customer (recipients not
           linked to any user). An example of override use would be to add a group
           linked to a res.groups like Hr Officers to set specific action buttons to
           them.
         * group_func is a function pointer taking a partner record as parameter. This
           method will be applied on recipients to know whether they belong to a given
           group or not. Only first matching group is kept. Evaluation order is the
           list order.
         * group_data is a dict containing parameters for the notification email
          * has_button_access: whether to display Access <Document> in email. True
            by default for new groups, False for portal / customer.
          * button_access: dict with url and title of the button
          * actions: list of action buttons to display in the notification email.
            Each action is a dict containing url and title of the button.
        Groups has a default value that you can find in mail_thread
        ``_notify_get_recipients_classify`` method.
        """
        is_thread_notification = self._notify_get_recipients_thread_info(msg_vals=msg_vals)['is_thread_notification']
        return [
            [
                'user',
                lambda pdata: pdata['type'] == 'user',
                {'has_button_access': is_thread_notification}
            ], [
                'portal',
                lambda pdata: pdata['type'] == 'portal',
                {'active': False,  # activate only on demand if rights are enabled
                 'has_button_access': False,
                }
            ], [
                'follower',
                lambda pdata: pdata['is_follower'],
                {'active': False,  # activate only on demand if rights are enabled
                 'has_button_access': False,
                }
            ], [
                'customer',
                lambda pdata: True,
                {'has_button_access': False}
            ]
        ]

    def _notify_get_recipients_classify(self, recipient_data, model_name, msg_vals=None):
        """ Classify recipients to be notified of a message in groups to have
        specific rendering depending on their group. For example users could
        have access to buttons customers should not have in their emails.
        Module-specific grouping should be done by overriding ``_notify_get_recipients_groups``
        method defined here-under.

        :param recipient_data: list of recipients information (based on res.partner
          records). See ``MailThread._notify_get_recipients()``;

        :return list: list of groups formatted for notification processing like
            [{'active': True,
              'actions': [],
              'button_access': {},
              'has_button_access': False,
              'recipients': [11],},
             {'active': True,
              'actions': [],
              'button_access': {'title': 'View Simple Chatter Model',
                                'url': '/mail/view?model=mail.test.simple&res_id=1497'},
              'has_button_access': True,
              'recipients': [4, 5, 6],},
             {'active': True,
              'actions': [],
              'button_access': {'title': 'View Simple Chatter Model',
                                'url': '/mail/view?model=mail.test.simple&res_id=1497'},
              'has_button_access': True,
              'recipients': [10, 11, 12],}
            ]
        """
        # keep a local copy of msg_vals as it may be modified to include more information about groups or links
        local_msg_vals = dict(msg_vals) if msg_vals else {}
        groups = self._notify_get_recipients_groups(msg_vals=local_msg_vals)
        access_link = self._notify_get_action_link('view', **local_msg_vals)

        if model_name:
            view_title = _('View %s', model_name)
        else:
            view_title = _('View')

        # fill group_data with default_values if they are not complete
        for group_name, group_func, group_data in groups:
            is_thread_notification = self._notify_get_recipients_thread_info(msg_vals=msg_vals)['is_thread_notification']
            group_data.setdefault('active', True)
            group_data.setdefault('actions', list())
            group_data.setdefault('has_button_access', is_thread_notification)
            group_data.setdefault('notification_is_customer', False)
            group_data.setdefault('notification_group_name', group_name)
            group_data.setdefault('recipients', list())
            group_button_access = group_data.setdefault('button_access', {})
            group_button_access.setdefault('url', access_link)
            group_button_access.setdefault('title', view_title)

        # classify recipients in each group
        for recipient in recipient_data:
            for group_name, group_func, group_data in groups:
                if group_data['active'] and group_func(recipient):
                    group_data['recipients'].append(recipient['id'])
                    break

        # filter out groups without recipients
        return [group_data for _group_name, _group_func, group_data in groups
                if group_data['recipients']]

    def _notify_get_recipients_thread_info(self, msg_vals=None):
        """ Tool method to compute thread info used in ``_notify_classify_recipients``
        and its sub-methods. """
        res_model = msg_vals['model'] if msg_vals and 'model' in msg_vals else self._name
        res_id = msg_vals['res_id'] if msg_vals and 'res_id' in msg_vals else self.ids[0] if self.ids else False
        return {
            'is_thread_notification': res_model and (res_model != 'mail.thread') and res_id
        }

    @api.model
    def _notify_encode_link(self, base_link, params):
        secret = self.env['ir.config_parameter'].sudo().get_param('database.secret')
        token = '%s?%s' % (base_link, ' '.join('%s=%s' % (key, params[key]) for key in sorted(params)))
        hm = hmac.new(secret.encode('utf-8'), token.encode('utf-8'), hashlib.sha1).hexdigest()
        return hm

    def _notify_get_action_link(self, link_type, **kwargs):
        """ Prepare link to an action: view document, follow document, ... """
        params = {
            'model': kwargs.get('model', self._name),
            'res_id': kwargs.get('res_id', self.ids and self.ids[0] or False),
        }
        # keep only accepted parameters:
        # - action (deprecated), token (assign), access_token (view)
        # - auth_signup: auth_signup_token and auth_login
        # - portal: pid, hash
        params.update(dict(
            (key, value)
            for key, value in kwargs.items()
            if key in ('action', 'token', 'access_token', 'auth_signup_token',
                       'auth_login', 'pid', 'hash')
        ))

        if link_type in ['view', 'assign', 'follow', 'unfollow']:
            base_link = '/mail/%s' % link_type
        elif link_type == 'controller':
            controller = kwargs.get('controller')
            params.pop('model')
            base_link = '%s' % controller
        else:
            return ''

        if link_type not in ['view']:
            token = self._notify_encode_link(base_link, params)
            params['token'] = token

        link = '%s?%s' % (base_link, urls.url_encode(params, sort=True))
        if self:
            link = self[0].get_base_url() + link

        return link

    # ------------------------------------------------------
    # FOLLOWERS API
    # ------------------------------------------------------

    def message_subscribe(self, partner_ids=None, subtype_ids=None):
        """ Main public API to add followers to a record set. Its main purpose is
        to perform access rights checks before calling ``_message_subscribe``. """
        if not self or not partner_ids:
            return True

        partner_ids = partner_ids or []
        adding_current = set(partner_ids) == set([self.env.user.partner_id.id])
        customer_ids = [] if adding_current else None

        if partner_ids and adding_current:
            try:
                self.check_access_rights('read')
                self.check_access_rule('read')
            except exceptions.AccessError:
                return False
        else:
            self.check_access_rights('write')
            self.check_access_rule('write')

        # filter inactive and private addresses
        if partner_ids and not adding_current:
            partner_ids = self.env['res.partner'].sudo().search([('id', 'in', partner_ids), ('active', '=', True), ('type', '!=', 'private')]).ids

        return self._message_subscribe(partner_ids, subtype_ids, customer_ids=customer_ids)

    def _message_subscribe(self, partner_ids=None, subtype_ids=None, customer_ids=None):
        """ Main private API to add followers to a record set. This method adds
        partners and channels, given their IDs, as followers of all records
        contained in the record set.

        If subtypes are given existing followers are erased with new subtypes.
        If default one have to be computed only missing followers will be added
        with default subtypes matching the record set model.

        This private method does not specifically check for access right. Use
        ``message_subscribe`` public API when not sure about access rights.

        :param customer_ids: see ``_insert_followers`` """
        if not self:
            return True

        if not subtype_ids:
            self.env['mail.followers']._insert_followers(
                self._name, self.ids,
                partner_ids, subtypes=None,
                customer_ids=customer_ids, check_existing=True, existing_policy='skip')
        else:
            self.env['mail.followers']._insert_followers(
                self._name, self.ids,
                partner_ids, subtypes=dict((pid, subtype_ids) for pid in partner_ids),
                customer_ids=customer_ids, check_existing=True, existing_policy='replace')

        return True

    def message_unsubscribe(self, partner_ids=None):
        """ Remove partners from the records followers. """
        # not necessary for computation, but saves an access right check
        if not partner_ids:
            return True
        if set(partner_ids) == set([self.env.user.partner_id.id]):
            self.check_access_rights('read')
            self.check_access_rule('read')
        else:
            self.check_access_rights('write')
            self.check_access_rule('write')
        self.env['mail.followers'].sudo().search([
            ('res_model', '=', self._name),
            ('res_id', 'in', self.ids),
            ('partner_id', 'in', partner_ids or []),
        ]).unlink()

    def _message_auto_subscribe_followers(self, updated_values, default_subtype_ids):
        """ Optional method to override in addons inheriting from mail.thread.
        Return a list tuples containing (
          partner ID,
          subtype IDs (or False if model-based default subtypes),
          QWeb template XML ID for notification (or False is no specific
            notification is required),
          ), aka partners and their subtype and possible notification to send
        using the auto subscription mechanism linked to updated values.

        Default value of this method is to return the new responsible of
        documents. This is done using relational fields linking to res.users
        with track_visibility set. Since OpenERP v7 it is considered as being
        responsible for the document and therefore standard behavior is to
        subscribe the user and send them a notification.

        Override this method to change that behavior and/or to add people to
        notify, using possible custom notification.

        :param updated_values: see ``_message_auto_subscribe``
        :param default_subtype_ids: coming from ``_get_auto_subscription_subtypes``
        """
        fnames = []
        field = self._fields.get('user_id')
        user_id = updated_values.get('user_id')
        if field and user_id and field.comodel_name == 'res.users' and (getattr(field, 'track_visibility', False) or getattr(field, 'tracking', False)):
            user = self.env['res.users'].sudo().browse(user_id)
            try: # avoid to make an exists, lets be optimistic and try to read it.
                if user.active:
                    return [(user.partner_id.id, default_subtype_ids, 'mail.message_user_assigned' if user != self.env.user else False)]
            except:
                pass
        return []

    def _message_auto_subscribe_notify(self, partner_ids, template):
        """ Notify new followers, using a template to render the content of the
        notification message. Notifications pushed are done using the standard
        notification mechanism in mail.thread. It is either inbox either email
        depending on the partner state: no user (email, customer), share user
        (email, customer) or classic user (notification_type)

        :param partner_ids: IDs of partner to notify;
        :param template: XML ID of template used for the notification;
        """
        if not self or self.env.context.get('mail_auto_subscribe_no_notify'):
            return
        if not self.env.registry.ready:  # Don't send notification during install
            return

        for record in self:
            model_description = self.env['ir.model']._get(record._name).display_name
            company = record.company_id.sudo() if 'company_id' in record else self.env.company
            values = {
                'access_link': record._notify_get_action_link('view'),
                'company': company,
                'model_description': model_description,
                'object': record,
            }
            assignation_msg = self.env['ir.qweb']._render(template, values, minimal_qcontext=True)
            assignation_msg = self.env['mail.render.mixin']._replace_local_links(assignation_msg)
            record.message_notify(
                subject=_('You have been assigned to %s', record.display_name),
                body=assignation_msg,
                partner_ids=partner_ids,
                record_name=record.display_name,
                email_layout_xmlid='mail.mail_notification_layout',
                model_description=model_description,
            )

    def _message_auto_subscribe(self, updated_values, followers_existing_policy='skip'):
        """ Handle auto subscription. Auto subscription is done based on two
        main mechanisms

         * using subtypes parent relationship. For example following a parent record
           (i.e. project) with subtypes linked to child records (i.e. task). See
           mail.message.subtype ``_get_auto_subscription_subtypes``;
         * calling _message_auto_subscribe_notify that returns a list of partner
           to subscribe, as well as data about the subtypes and notification
           to send. Base behavior is to subscribe responsible and notify them;

        Adding application-specific auto subscription should be done by overriding
        ``_message_auto_subscribe_followers``. It should return structured data
        for new partner to subscribe, with subtypes and eventual notification
        to perform. See that method for more details.

        :param updated_values: values modifying the record trigerring auto subscription
        """
        if not self:
            return True

        new_partner_subtypes = dict()

        # return data related to auto subscription based on subtype matching (aka:
        # default task subtypes or subtypes from project triggering task subtypes)
        updated_relation = dict()
        child_ids, def_ids, all_int_ids, parent, relation = self.env['mail.message.subtype']._get_auto_subscription_subtypes(self._name)

        # check effectively modified relation field
        for res_model, fnames in relation.items():
            for field in (fname for fname in fnames if updated_values.get(fname)):
                updated_relation.setdefault(res_model, set()).add(field)
        udpated_fields = [fname for fnames in updated_relation.values() for fname in fnames if updated_values.get(fname)]

        if udpated_fields:
            # fetch "parent" subscription data (aka: subtypes on project to propagate on task)
            doc_data = [(model, [updated_values[fname] for fname in fnames]) for model, fnames in updated_relation.items()]
            res = self.env['mail.followers']._get_subscription_data(doc_data, None, include_pshare=True, include_active=True)
            for _fol_id, _res_id, partner_id, subtype_ids, pshare, active in res:
                # use project.task_new -> task.new link
                sids = [parent[sid] for sid in subtype_ids if parent.get(sid)]
                # add checked subtypes matching model_name
                sids += [sid for sid in subtype_ids if sid not in parent and sid in child_ids]
                if partner_id and active:  # auto subscribe only active partners
                    if pshare:  # remove internal subtypes for customers
                        new_partner_subtypes[partner_id] = set(sids) - set(all_int_ids)
                    else:
                        new_partner_subtypes[partner_id] = set(sids)

        notify_data = dict()
        res = self._message_auto_subscribe_followers(updated_values, def_ids)
        for partner_id, sids, template in res:
            new_partner_subtypes.setdefault(partner_id, sids)
            if template:
                partner = self.env['res.partner'].browse(partner_id)
                lang = partner.lang if partner else None
                notify_data.setdefault((template, lang), list()).append(partner_id)

        self.env['mail.followers']._insert_followers(
            self._name, self.ids,
            list(new_partner_subtypes), subtypes=new_partner_subtypes,
            check_existing=True, existing_policy=followers_existing_policy)

        # notify people from auto subscription, for example like assignation
        for (template, lang), pids in notify_data.items():
            self.with_context(lang=lang)._message_auto_subscribe_notify(pids, template)

        return True

    # ------------------------------------------------------
    # DISCORDUSS API
    # ------------------------------------------------------

    def _message_add_reaction_after_hook(self, message, content):
        """ Hook to add custom behavior after having added a reaction to a message. """

    def _message_remove_reaction_after_hook(self, message, content):
        """ Hook to add custom behavior after having removed a reaction from a message. """

    # ------------------------------------------------------
    # THREAD MESSAGE UPDATE
    # ------------------------------------------------------

    def message_change_thread(self, new_thread, new_parent_message=False):
        """
        Transfer the list of the mail thread messages from an model to another

        :param id : the old res_id of the mail.message
        :param new_res_id : the new res_id of the mail.message
        :param new_model : the name of the new model of the mail.message

        Example :   my_lead.message_change_thread(my_project_task)
                    will transfer the context of the thread of my_lead to my_project_task
        """
        self.ensure_one()
        # get the subtype of the comment Message
        subtype_comment = self.env['ir.model.data']._xmlid_to_res_id('mail.mt_comment')

        # get the ids of the comment and not-comment of the thread
        # TDE check: sudo on mail.message, to be sure all messages are moved ?
        MailMessage = self.env['mail.message']
        msg_comment = MailMessage.search([
            ('model', '=', self._name),
            ('res_id', '=', self.id),
            ('message_type', '!=', 'user_notification'),
            ('subtype_id', '=', subtype_comment)])
        msg_not_comment = MailMessage.search([
            ('model', '=', self._name),
            ('res_id', '=', self.id),
            ('message_type', '!=', 'user_notification'),
            ('subtype_id', '!=', subtype_comment)])

        # update the messages
        msg_vals = {"res_id": new_thread.id, "model": new_thread._name}
        if new_parent_message:
            msg_vals["parent_id"] = new_parent_message.id
        msg_comment.write(msg_vals)

        # other than comment: reset subtype
        msg_vals["subtype_id"] = None
        msg_not_comment.write(msg_vals)
        return True

    def _message_update_content(self, message, body, attachment_ids=None,
                                strict=True, **kwargs):
        """ Update message content. Currently does not support attachments
        specific code (see ``_process_attachments_for_post``), to be added
        when necessary.

        Private method to use for tooling, do not expose to interface as editing
        messages should be avoided at all costs (think of: notifications already
        sent, ...).

        :param <mail.message> message: message to update, should be linked to self through
          model and res_id;
        :param str body: new body (None to skip its update);
        :param list attachment_ids: list of new attachments IDs, replacing old one (None
          to skip its update);
        :param bool strict: whether to check for allowance before updating
          content. This should be skipped only when really necessary as it
          creates issues with already-sent notifications, lack of content
          tracking, ...

        Kwargs are supported, notably to match mail.message fields to update.
        See content of this method for more details about supported keys.
        """
        self.ensure_one()
        if strict:
            self._check_can_update_message_content(message.sudo())

        msg_values = {'body': body} if body is not None else {}
        if attachment_ids:
            msg_values.update(
                self._process_attachments_for_post([], attachment_ids, {
                    'body': body,
                    'model': self._name,
                    'res_id': self.id,
                })
            )
        elif attachment_ids is not None:  # None means "no update"
            message.attachment_ids._delete_and_notify()
        if msg_values:
            message.write(msg_values)

        if 'scheduled_date' in kwargs:
            # update scheduled datetime
            if kwargs['scheduled_date']:
                self.env['mail.message.schedule'].sudo()._update_message_scheduled_datetime(
                    message,
                    kwargs['scheduled_date']
                )
            # (re)send notifications
            else:
                self.env['mail.message.schedule'].sudo()._send_message_notifications(message)

        # cleanup related message data if the message is empty
        message.sudo()._filter_empty()._cleanup_side_records()

        return self._message_update_content_after_hook(message)

    def _message_update_content_after_hook(self, message):
        """ Hook to add custom behavior after having updated the message content. """
        return True

    # ------------------------------------------------------
    # CONTROLLERS
    # ------------------------------------------------------

    def _get_mail_redirect_suggested_company(self):
        """ Return the suggested company to be set on the context
        in case of a mail redirection to the record. To avoid multi
        company issues when clicking on a link sent by email, this
        could be called to try setting the most suited company on
        the allowed_company_ids in the context. This method can be
        overridden, for example on the hr.leave model, where the
        most suited company is the company of the leave type, as
        specified by the ir.rule.
        """
        if 'company_id' in self:
            return self.company_id
        return False

    def _get_mail_thread_data_attachments(self):
        self.ensure_one()
        return self.env['ir.attachment'].search([('res_id', '=', self.id), ('res_model', '=', self._name)], order='id desc')

    def _get_mail_thread_data(self, request_list):
        res = {'hasWriteAccess': False, 'hasReadAccess': True}
        if not self:
            res['hasReadAccess'] = False
            return res

        self.ensure_one()
        try:
            self.check_access_rights("write")
            self.check_access_rule("write")
            res['hasWriteAccess'] = True
        except AccessError:
            pass
        if 'activities' in request_list:
            res['activities'] = self.activity_ids.activity_format()
        if 'attachments' in request_list:
            res['attachments'] = self._get_mail_thread_data_attachments()._attachment_format()
        if 'followers' in request_list:
            res['followers'] = [{
                'id': follower.id,
                'partner_id': follower.partner_id.id,
                'name': follower.name,
                'display_name': follower.display_name,
                'email': follower.email,
                'is_active': follower.is_active,
                'partner': follower.partner_id.mail_partner_format()[follower.partner_id],
            } for follower in self.message_follower_ids]
        if 'suggestedRecipients' in request_list:
            res['suggestedRecipients'] = self._message_get_suggested_recipients()[self.id]
        return res