Warn if the bot cannot send a message in the widget (#852)

* Add a warning when the room does not have permission to post messages.

* Update warning

* changelog

changelog.d/852.feature

@@ -0,0 +1 @@
+Warn if the bot does not have permissions to talk in a room.

src/Widgets/BridgeWidgetApi.ts

@@ -176,9 +176,13 @@ export class BridgeWidgetApi extends ProvisioningApi {
             // If we have a service filter.
             .filter(c => typeof serviceFilter !== "string" || c?.service === serviceFilter) as GetConnectionsResponseItem[];
         const userPl = powerlevel.content.users?.[req.userId] || powerlevel.defaultUserLevel;
+        const botPl = powerlevel.content.users?.[botUser.userId] || powerlevel.defaultUserLevel;
         for (const c of connections) {
-            const requiredPl = Math.max(powerlevel.content.events?.[c.type] || 0, powerlevel.defaultStateEventLevel);
+            // TODO: What about crypto?
-            c.canEdit = userPl >= requiredPl;
+            const requiredPlForEdit = Math.max(powerlevel.content.events?.[c.type] ?? 0, powerlevel.defaultStateEventLevel);
+            const requiredPlForMessages = Math.max(powerlevel.content.events?.["m.room.message"] ?? powerlevel.content.events_default ?? 0);
+            c.canEdit = userPl >= requiredPlForEdit;
+            c.canSendMessages = botPl >= requiredPlForMessages;
             if (!c.canEdit) {
                 delete c.secrets;
             }

src/provisioning/api.ts

@@ -18,6 +18,7 @@ export interface GetConnectionsResponseItem<Config = object, Secrets = object> e
     id: string;
     config: Config;
     secrets?: Secrets;
+    canSendMessages?: boolean;
     canEdit?: boolean;
     warning?: ConnectionWarning;
 }

web/components/roomConfig/RoomConfig.tsx

@@ -96,6 +96,8 @@ export const RoomConfig = function<SConfig, ConnectionType extends GetConnection
 
     const [ toMigrate, setToMigrate ] = useState<ConnectionType[]>([]);
 
+    const canSendMessages = connections?.every(c => c.canSendMessages) ?? true;
+
     useEffect(() => {
         // produce `toMigrate` composed of `migrationCandidates` with anything already in `connections` filtered out
         // use `migrationComparator` to determine duplicates
@@ -164,6 +166,12 @@ export const RoomConfig = function<SConfig, ConnectionType extends GetConnection
                     <h1>{text.header}</h1>
                 </header>
             }
+            { !canSendMessages && canEditRoom &&
+                <WarningPane header={"Misconfigured permissions"}>
+                    This room does not permit the bot to send messages.
+                    Please go to the room settings in your client and adjust permissions.
+                </WarningPane>
+            }
             { canEditRoom && <section>
                 <h2>{text.createNew}</h2>
                 {serviceConfig && <ConnectionConfigComponent