1 files changed, 34 insertions, 1 deletions
diff --git a/addons/mail/models/mail_thread.py b/addons/mail/models/mail_thread.py
index 4ec3af5159e..32639ae75a9 100644
--- a/addons/mail/models/mail_thread.py
+++ b/addons/mail/models/mail_thread.py
@@ -23,9 +23,10 @@ from email.message import Message
 from email.utils import formataddr
 from lxml import etree
 from werkzeug import url_encode
+from werkzeug import urls
 
 from odoo import _, api, exceptions, fields, models, tools
-from odoo.tools import pycompat
+from odoo.tools import pycompat, ustr
 from odoo.tools.safe_eval import safe_eval
 
 
@@ -374,6 +375,38 @@ class MailThread(models.AbstractModel):
     # Technical methods / wrappers / tools
     # ------------------------------------------------------
 
+    def _replace_local_links(self, html, base_url=None):
+        """ Replace local links by absolute links. It is required in various
+        cases, for example when sending emails on chatter or sending mass
+        mailings. It replaces
+
+         * href of links (mailto will not match the regex)
+         * src of images (base64 hardcoded data will not match the regex)
+         * styling using url like background-image: url
+
+        It is done using regex because it is shorten than using an html parser
+        to create a potentially complex soupe and hope to have a result that
+        has not been harmed.
+        """
+        if not html:
+            return html
+
+        html = ustr(html)
+
+        def _sub_relative2absolute(match):
+            # compute here to do it only if really necessary + cache will ensure it is done only once
+            # if not base_url
+            if not _sub_relative2absolute.base_url:
+                _sub_relative2absolute.base_url = self.env["ir.config_parameter"].sudo().get_param("web.base.url")
+            return match.group(1) + urls.url_join(_sub_relative2absolute.base_url, match.group(2))
+
+        _sub_relative2absolute.base_url = base_url
+        html = re.sub(r"""(<img(?=\s)[^>]*\ssrc=")(/[^/][^"]+)""", _sub_relative2absolute, html)
+        html = re.sub(r"""(<a(?=\s)[^>]*\shref=")(/[^/][^"]+)""", _sub_relative2absolute, html)
+        html = re.sub(r"""(<[^>]+\bstyle="[^"]+\burl\('?)(/[^/'][^'")]+)""", _sub_relative2absolute, html)
+
+        return html
+
     @api.model
     def _garbage_collect_attachments(self):
         """ Garbage collect lost mail attachments. Those are attachments