VC/Zoom: Warn on deletion if user is not the host

vc_zoom/README.md

@@ -21,6 +21,7 @@
 - Always show the full join link and passcode to event managers
 - The meeting passcode can be restricted to registered participants
 - Show "Make me host" button in the management area and in contributions/sessions as well
+- Warn the user if they delete a Zoom meeting linked to multiple events if they aren't the host
 
 **Breaking change:** The email domains are now stored as a list of strings instead of a comma-separated list. You need to update them in the plugin settings.
 

vc_zoom/indico_vc_zoom/plugin.py

@@ -189,6 +189,12 @@ class ZoomPlugin(VCPluginMixin, IndicoPlugin):
             form.password.data = gen_random_password()
         return form
 
+    def get_extra_delete_msg(self, vc_room, event_vc_room):
+        host = principal_from_identifier(vc_room.data['host'])
+        if host == session.user or len(vc_room.events) <= 1:
+            return ''
+        return render_plugin_template('vc_zoom:extra_delete_msg.html', host=host.full_name)
+
     def _extend_indico_cli(self, sender, **kwargs):
         return cli
 

vc_zoom/indico_vc_zoom/templates/extra_delete_msg.html

@@ -0,0 +1,7 @@
+<p style="margin-top: 1em;">
+    {% trans %}
+        The host of this Zoom meeting is <strong>{{ host }}</strong>. In case you want
+        to delete this Zoom meeting from all events, please make sure that they do not
+        use it for other events that may still need it!
+    {% endtrans %}
+</p>