fix: revoke all channel permissions if can't view

crates/core/permissions/src/impl.rs

@@ -118,6 +118,10 @@ pub async fn calculate_channel_permissions<P: PermissionQuery>(query: &mut P) ->
                     permissions.restrict(*ALLOW_IN_TIMEOUT);
                 }
 
+                if !permissions.has_channel_permission(ChannelPermission::ViewChannel) {
+                    permissions.revoke_all();
+                }
+                
                 permissions
             } else {
                 0_u64.into()

crates/core/permissions/src/models/mod.rs

@@ -28,6 +28,11 @@ impl PermissionValue {
         self.0 &= !v;
     }
 
+    /// Revoke all permissions
+    pub fn revoke_all(&mut self) {
+        self.0 = 0;
+    }
+
     /// Restrict to given permissions
     pub fn restrict(&mut self, v: u64) {
         self.0 &= v;