[IMP] im_livechat: ensure that visitors always gets the same operator

Task #1919871

Purpose
=======

If a visitor comes on the website and launches a livechat, it will be randomly assigned operator A.
If he comes the next day and opens a livechat again, we want him to have the same operator if he's available.

To handle that use case, we added a cookie that stores the "previous operator id" information for 7 days.

1 files changed, 6 insertions, 2 deletions

diff --git a/addons/im_livechat/controllers/main.py b/addons/im_livechat/controllers/main.py
index d87cf2329cb..5703563e95d 100644
--- a/addons/im_livechat/controllers/main.py
+++ b/addons/im_livechat/controllers/main.py
@@ -80,7 +80,7 @@ class LivechatController(http.Controller):
         }
 
     @http.route('/im_livechat/get_session', type="json", auth='public', cors="*")
-    def get_session(self, channel_id, anonymous_name, **kwargs):
+    def get_session(self, channel_id, anonymous_name, previous_operator_id=None, **kwargs):
         user_id = None
         country_id = None
         # if the user is identifiy (eg: portal user on the frontend), don't use the anonymous name. The user will be added to session.
@@ -94,7 +94,11 @@ class LivechatController(http.Controller):
             country = request.env['res.country'].sudo().search([('code', '=', country_code)], limit=1) if country_code else None
             if country:
                 anonymous_name, country_id = _("%s (%s)") % (anonymous_name, country.name), country.id
-        return request.env["im_livechat.channel"].with_context(lang=False).sudo().browse(channel_id)._get_mail_channel(anonymous_name, user_id, country_id)
+
+        if previous_operator_id:
+            previous_operator_id = int(previous_operator_id)
+
+        return request.env["im_livechat.channel"].with_context(lang=False).sudo().browse(channel_id)._get_mail_channel(anonymous_name, previous_operator_id, user_id, country_id)
 
     @http.route('/im_livechat/feedback', type='json', auth='public', cors="*")
     def feedback(self, uuid, rate, reason=None, **kwargs):