Show the call and share button if the user can create a guest link.

src/hooks/room/useRoomCall.ts

@@ -189,6 +189,8 @@ export const useRoomCall = (
     // We only want to prompt to pin the widget if it's not element call based.
     const isECWidget = WidgetType.CALL.matches(widget?.type ?? "");
     const promptPinWidget = !isECWidget && canPinWidget && !widgetPinned;
+    const userId = room.client.getUserId();
+    const canInviteToRoom = userId ? room.canInvite(userId) : false;
     const state = useMemo((): State => {
         if (activeCalls.find((call) => call.roomId != room.roomId)) {
             return State.Ongoing;
@@ -199,8 +201,9 @@ export const useRoomCall = (
         if (hasLegacyCall) {
             return State.Ongoing;
         }
-
-        if (memberCount <= 1) {
+        const canCallAlone =
+            canInviteToRoom && (room.getJoinRule() === "public" || room.getJoinRule() === JoinRule.Knock);
+        if (!(memberCount > 1 || canCallAlone)) {
             return State.NoOneHere;
         }
 
@@ -210,6 +213,7 @@ export const useRoomCall = (
         return State.NoCall;
     }, [
         activeCalls,
+        canInviteToRoom,
         hasGroupCall,
         hasJitsiWidget,
         hasLegacyCall,
@@ -218,7 +222,7 @@ export const useRoomCall = (
         mayEditWidgets,
         memberCount,
         promptPinWidget,
-        room.roomId,
+        room,
     ]);
 
     const voiceCallClick = useCallback(

test/components/views/rooms/RoomHeader-test.tsx

@@ -33,6 +33,7 @@ import {
     getByLabelText,
     getByRole,
     getByText,
+    queryAllByLabelText,
     render,
     RenderOptions,
     screen,
@@ -83,7 +84,6 @@ describe("RoomHeader", () => {
     );
 
     let room: Room;
-
     const ROOM_ID = "!1:example.org";
 
     let setCardSpy: jest.SpyInstance | undefined;
@@ -371,14 +371,37 @@ describe("RoomHeader", () => {
             }
         });
 
-        it("can't call if you have no friends", () => {
+        it("can't call if you have no friends and cannot invite friends", () => {
             mockRoomMembers(room, 1);
             const { container } = render(<RoomHeader room={room} />, getWrapper());
             for (const button of getAllByLabelText(container, "There's no one here to call")) {
                 expect(button).toHaveAttribute("aria-disabled", "true");
             }
         });
 
+        it("can call if you have no friends but can invite friends", () => {
+            mockRoomMembers(room, 1);
+            // go through all the different `canInvite` and `getJoinRule` combinations
+            jest.spyOn(room, "getJoinRule").mockReturnValue(JoinRule.Invite);
+            jest.spyOn(room, "canInvite").mockReturnValue(false);
+            const { container: containerNoInviteNotPublic } = render(<RoomHeader room={room} />, getWrapper());
+            expect(queryAllByLabelText(containerNoInviteNotPublic, "There's no one here to call")).toHaveLength(2);
+            jest.spyOn(room, "getJoinRule").mockReturnValue(JoinRule.Knock);
+            jest.spyOn(room, "canInvite").mockReturnValue(false);
+            const { container: containerNoInvitePublic } = render(<RoomHeader room={room} />, getWrapper());
+            expect(queryAllByLabelText(containerNoInvitePublic, "There's no one here to call")).toHaveLength(2);
+
+            jest.spyOn(room, "canInvite").mockReturnValue(true);
+            jest.spyOn(room, "getJoinRule").mockReturnValue(JoinRule.Invite);
+            const { container: containerInviteNotPublic } = render(<RoomHeader room={room} />, getWrapper());
+            expect(queryAllByLabelText(containerInviteNotPublic, "There's no one here to call")).toHaveLength(2);
+
+            jest.spyOn(room, "getJoinRule").mockReturnValue(JoinRule.Knock);
+            jest.spyOn(room, "canInvite").mockReturnValue(true);
+            const { container: containerInvitePublic } = render(<RoomHeader room={room} />, getWrapper());
+            expect(queryAllByLabelText(containerInvitePublic, "There's no one here to call")).toHaveLength(0);
+        });
+
         it("calls using legacy or jitsi", async () => {
             mockRoomMembers(room, 2);
             jest.spyOn(room.currentState, "mayClientSendStateEvent").mockImplementation((key) => {