[IMP] web_editor: allow collaboration for portal users

Encapsulate the `mail` ICE servers availability check in an overridable
function, since the hack does not work in a portal context, but Knowledge portal
users should be allowed to use the collaborative feature. Knowledge will
override the session check by always returning true, since mail is a dependency
of Knowledge and is therefore always installed with it.

Allow access to the edition channel for portal users.

task-3378266

X-original-commit: odoo/odoo@03e1148ac9
Part-of: odoo/odoo#128962

addons/web_editor/models/ir_websocket.py

@@ -23,7 +23,7 @@ class IrWebsocket(models.AbstractModel):
                         res_id = int(match[3])
 
                         # Verify access to the edition channel.
-                        if not self.env.user._is_internal():
+                        if self.env.user._is_public():
                             raise AccessDenied()
 
                         document = self.env[model_name].browse([res_id])

addons/web_editor/static/src/js/wysiwyg/wysiwyg.js

@@ -324,8 +324,7 @@ export class Wysiwyg extends Component {
         let editorCollaborationOptions;
         if (
             options.collaborationChannel &&
-            // Hack: check if mail module is installed.
-            session.notification_type
+            this._hasICEServers()
         ) {
             editorCollaborationOptions = this.setupCollaboration(options.collaborationChannel);
             if (this.options.collaborativeTrigger === 'start') {
@@ -2864,6 +2863,12 @@ export class Wysiwyg extends Component {
     _bindOnBlur() {
         this.$editable.on('blur', this._onBlur);
     }
+
+    _hasICEServers() {
+        // Hack: check if mail module is installed.
+        session.notification_type
+    }
+
     /**
      * Saves a base64 encoded image as an attachment.
      * Relies on _saveModifiedImage being called after it for webp.