[IMP] im_livechat: visitor history command

this commit introduces the '/history' command
for an operator during a livechat session.

When the visitor load a page, its url is added in
a cookie (kept only 1 day) in order to track his
visited web pages.
The '/history' command will ask the cookie content
and send it to the operator as a transient message
in the livechat channel.

addons/im_livechat/controllers/main.py

@@ -105,3 +105,10 @@ class LivechatController(http.Controller):
                 rating.write(values)
             return rating.id
         return False
+
+    @http.route('/im_livechat/history', type="json", auth="public")
+    def history_pages(self, pid, channel_uuid, page_history=None):
+        channel = request.env['mail.channel'].search([('uuid', '=', channel_uuid)])
+        if channel:
+            channel._send_history_message(pid, page_history)
+        return True

addons/im_livechat/models/mail_channel.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from odoo import api, fields, models
+from odoo import api, fields, models, _
 
 
 class ChannelPartner(models.Model):
@@ -107,3 +107,28 @@ class MailChannel(models.Model):
         if help:
             return '<p">%s</p>' % (help)
         return super(MailChannel, self).get_empty_list_help(help)
+
+    def _define_command_history(self):
+        return {
+            'channel_types': ['livechat'],
+            'help': _('See 15 last visited pages')
+        }
+
+    def _execute_command_history(self, **kwargs):
+        notification = []
+        notification_values = {
+            '_type': 'history_command',
+        }
+        notification.append([self.uuid, dict(notification_values)])
+        return self.env['bus.bus'].sendmany(notification)
+
+    def _send_history_message(self, pid, page_history):
+        message_body = _('No history found')
+        if page_history:
+            html_links = ['<li><a href="%s" target="_blank">%s</a></li>' % (page, page) for page in page_history]
+            message_body = '<span class="o_mail_notification"><ul>%s</ul></span>' % (''.join(html_links))
+        self.env['bus.bus'].sendone((self._cr.dbname, 'res.partner', pid), {
+            'body': message_body,
+            'channel_ids': self.ids,
+            'info': 'transient_message',
+        })

addons/im_livechat/static/src/js/im_livechat.js

@@ -1,6 +1,7 @@
 odoo.define('im_livechat.im_livechat', function (require) {
 "use strict";
 
+var local_storage = require('web.local_storage');
 var bus = require('bus.bus').bus;
 var config = require('web.config');
 var core = require('web.core');
@@ -14,6 +15,26 @@ var ChatWindow = require('mail.ChatWindow');
 var _t = core._t;
 var QWeb = core.qweb;
 
+// Constants
+var LIVECHAT_COOKIE_HISTORY = 'im_livechat_history';
+var HISTORY_LIMIT = 15;
+
+// History tracking
+var page = window.location.href.replace(/^.*\/\/[^\/]+/, '');
+var page_history = utils.get_cookie(LIVECHAT_COOKIE_HISTORY);
+var url_history = [];
+if(page_history){
+    url_history = JSON.parse(page_history) || [];
+}
+if (!_.contains(url_history, page)) {
+    url_history.push(page);
+    while (url_history.length > HISTORY_LIMIT) {
+        url_history.shift();
+    }
+    utils.set_cookie(LIVECHAT_COOKIE_HISTORY, JSON.stringify(url_history), 60*60*24); // 1 day cookie
+}
+
+
 var LivechatButton = Widget.extend({
     className:"openerp o_livechat_button hidden-print",
 
@@ -69,18 +90,30 @@ var LivechatButton = Widget.extend({
         bus.on('notification', this, function (notifications) {
             var self = this;
             _.each(notifications, function (notification) {
-                if (self.channel && (notification[0] === self.channel.uuid)) {
-                    self.add_message(notification[1]);
-                    self.render_messages();
-                    if (self.chat_window.folded || !self.chat_window.thread.is_at_bottom()) {
-                        self.chat_window.update_unread(self.chat_window.unread_msgs+1);
-                    }
-                }
+                self._on_notification(notification);
             });
         });
         return this._super();
     },
-
+    _on_notification: function(notification){
+        if (this.channel && (notification[0] === this.channel.uuid)) {
+            if(notification[1]._type === "history_command") { // history request
+                var cookie = utils.get_cookie(LIVECHAT_COOKIE_HISTORY);
+                var history = cookie ? JSON.parse(cookie) : [];
+                session.rpc("/im_livechat/history", {
+                    pid: this.channel.operator_pid[0],
+                    channel_uuid: this.channel.uuid,
+                    page_history: history,
+                });
+            }else{ // normal message
+                this.add_message(notification[1]);
+                this.render_messages();
+                if (this.chat_window.folded || !this.chat_window.thread.is_at_bottom()) {
+                    this.chat_window.update_unread(this.chat_window.unread_msgs+1);
+                }
+            }
+        }
+    },
     load_qweb_template: function(){
         return $.when(
             $.get('/mail/static/src/xml/chat_window.xml'),