[IMP] mail: handle forwarded emails in mailgateway

If the 'To' of an incoming email is an alias on another model we now consider
this emails as a forward to a new alias. A use case for this is an email on
a task that should be considered as an issue and forwarded to another alias.

addons/mail/__init__.py

@@ -3,3 +3,4 @@
 import models
 import wizard
 import controllers
+import tests.test_mail_model

addons/mail/models/mail_thread.py

@@ -1060,6 +1060,15 @@ class MailThread(models.AbstractModel):
             return []
 
         # 1. message is a reply to an existing message (exact match of message_id or compat-mode)
+        if reply_model and reply_thread_id:
+            other_alias = Alias.search([
+                '&',
+                ('alias_name', '!=', False),
+                ('alias_name', '=', email_to_localpart)
+            ])
+            if other_alias and other_alias.alias_model_id.model != reply_model:
+                reply_match = False
+
         if reply_match:
             compat_mode = False
             msg_references = tools.mail_header_msgid_re.findall(thread_references)

addons/mail/security/ir.model.access.csv

@@ -33,3 +33,4 @@ access_mail_template,mail.template,model_mail_template,base.group_user,1,1,1,0
 access_mail_template_system,mail.template_system,model_mail_template,base.group_system,1,1,1,1
 access_mail_shortcode,mail.shortcode,model_mail_shortcode,base.group_user,1,1,1,1
 access_mail_shortcode_portal,mail.shortcode.portal,model_mail_shortcode,base.group_portal,1,0,0,0
+access_mail_test_all,mail.test.all,model_mail_test,base.group_user,1,1,1,1

addons/mail/tests/test_mail_gateway.py

@@ -298,6 +298,14 @@ class TestMailgateway(TestMail):
             'alias_model_id': self.mail_channel_model.id,
             'alias_contact': 'everyone'})
 
+        # test@.. will cause the creation of new mail.test
+        self.mail_test_model = self.env['ir.model'].search([('model', '=', 'mail.test')], limit=1)
+        self.alias_2 = self.env['mail.alias'].create({
+            'alias_name': 'test',
+            'alias_user_id': False,
+            'alias_model_id': self.mail_test_model.id,
+            'alias_contact': 'everyone'})
+
         # Set a first message on public group to test update and hierarchy
         self.fake_email = self.env['mail.message'].create({
             'model': 'mail.channel',
@@ -533,6 +541,34 @@ class TestMailgateway(TestMail):
         self.assertEqual(len(self.group_public.message_ids), 2, 'message_process: group should contain one new message')
         self.assertEqual(len(self.fake_email.child_ids), 1, 'message_process: new message should be children of the existing one')
 
+    @mute_logger('openerp.addons.mail.models.mail_thread', 'openerp.models')
+    def test_message_process_references_forward(self):
+        """ Incoming email using references but with alias forward should not go into references destination """
+        res_test = self.format_and_process(
+            MAIL_TEMPLATE, to='test@example.com',
+            subject='My Dear Forward',
+            extra='References: <2233@a.com>\r\n\t<3edss_dsa@b.com> %s' % self.fake_email.message_id,
+            msg_id='<1198923581.41972151344608186800.JavaMail.4@agrolait.com>',
+            target_model='mail.test')
+
+        self.assertEqual(len(self.group_public.message_ids), 1, 'message_process: group should not contain new message')
+        self.assertEqual(len(self.fake_email.child_ids), 0, 'message_process: original email should not contain childs')
+        self.assertEqual(res_test.name, 'My Dear Forward')
+        self.assertEqual(len(res_test.message_ids), 1)
+
+    @mute_logger('openerp.addons.mail.models.mail_thread', 'openerp.models')
+    def test_message_process_references_forward_cc(self):
+        """ Incoming email using references but with alias forward should not go into references destination """
+        self.format_and_process(
+            MAIL_TEMPLATE, to='erroneous@example.com', cc='test@example.com',
+            subject='My Dear Forward',
+            extra='References: <2233@a.com>\r\n\t<3edss_dsa@b.com> %s' % self.fake_email.message_id,
+            msg_id='<1198923581.41972151344608186800.JavaMail.4@agrolait.com>',
+            target_model='mail.test')
+
+        self.assertEqual(len(self.group_public.message_ids), 2, 'message_process: group should contain one new message')
+        self.assertEqual(len(self.fake_email.child_ids), 1, 'message_process: new message should be children of the existing one')
+
     @mute_logger('openerp.addons.mail.models.mail_thread', 'openerp.models')
     def test_message_process_model_res_id(self):
         """ Incoming email with ref holding model / res_id but that does not match any message in the thread: must raise since OpenERP saas-3 """

addons/mail/tests/test_mail_model.py

@@ -0,0 +1,17 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, fields, models
+
+
+class MailTest(models.Model):
+    """ A mail.channel is a discussion group that may behave like a listener
+    on documents. """
+    _description = 'Test Mail Model'
+    _name = 'mail.test'
+    _mail_post_access = 'read'
+    _inherit = ['mail.thread']
+
+    name = fields.Char()
+    alias_id = fields.Many2one(
+        'mail.alias', 'Alias')