[IMP] mass_mailing: add 'view in browser' link in mailings

PURPOSE

Add a block that allows recipients to check the email in a browser in case
their mail service provider does not render it well or to see it full screen.

SPECIFICATIONS

A thumbnail has been added in the snippet thumbnails list of the mail editor.
It allows to add an header snippet. This snippet contains a link allowing the
recipient to see the mail in its browser instead of its mail client.

Add a route to display a mailing content. This route should be recipient
dependent as mailings could contain jinja markers. Using the same access token
and check as unsubscribe route this public route allows to display a mailing
content directly rendered for a given customer.

_get_unsubscribe_url method is moved from mail_mail to mailing as it does
not really belong to the mail model. Indeed it is mailing dependent.

A view URL leading to the view in browser route is added. It is managed like
the unsubscribe url: magically avoid shortening, magically rewrite when
sending email.

Task ID-2239327
PR #49886

1 files changed, 29 insertions, 0 deletions

diff --git a/addons/mass_mailing/controllers/main.py b/addons/mass_mailing/controllers/main.py
index 30653260425..bae258f9bf1 100644
--- a/addons/mass_mailing/controllers/main.py
+++ b/addons/mass_mailing/controllers/main.py
@@ -105,6 +105,35 @@ class MassMailController(http.Controller):
 
         return response
 
+    @http.route(['/mailing/<int:mailing_id>/view'], type='http', website=True, auth='public')
+    def view(self, mailing_id, email=None, res_id=None, token=""):
+        mailing = request.env['mailing.mailing'].sudo().browse(mailing_id)
+        if mailing.exists():
+            res_id = int(res_id) if res_id else False
+            if not self._valid_unsubscribe_token(mailing_id, res_id, email, str(token)) and not request.env.user.has_group('mass_mailing.group_mass_mailing_user'):
+                raise exceptions.AccessDenied()
+
+            res = mailing.convert_links()
+            base_url = request.env['ir.config_parameter'].sudo().get_param('web.base.url').rstrip('/')
+            urls_to_replace = [
+               (base_url + '/unsubscribe_from_list', mailing._get_unsubscribe_url(email, res_id)),
+               (base_url + '/view', mailing._get_view_url(email, res_id))
+            ]
+            for url_to_replace, new_url in urls_to_replace:
+                if url_to_replace in res[mailing_id]:
+                    res[mailing_id] = res[mailing_id].replace(url_to_replace, new_url if new_url else '#')
+
+            res[mailing_id] = res[mailing_id].replace(
+                'class="o_snippet_view_in_browser"',
+                'class="o_snippet_view_in_browser" style="display: none;"'
+            )
+
+            return request.render('mass_mailing.view', {
+                    'body': res[mailing_id],
+                })
+
+        return request.redirect('/web')
+
     @http.route('/r/<string:code>/m/<int:mailing_trace_id>', type='http', auth="public")
     def full_url_redirect(self, code, mailing_trace_id, **post):
         # don't assume geoip is set, it is part of the website module