Disable the composer when you don't have the power to post. (#4076)

ElementX/Sources/Mocks/Generated/GeneratedMocks.swift

@@ -8593,6 +8593,76 @@ class JoinedRoomProxyMock: JoinedRoomProxyProtocol, @unchecked Sendable {
     }
     //MARK: - canUser
 
+    var canUserUserIDSendMessageUnderlyingCallsCount = 0
+    var canUserUserIDSendMessageCallsCount: Int {
+        get {
+            if Thread.isMainThread {
+                return canUserUserIDSendMessageUnderlyingCallsCount
+            } else {
+                var returnValue: Int? = nil
+                DispatchQueue.main.sync {
+                    returnValue = canUserUserIDSendMessageUnderlyingCallsCount
+                }
+
+                return returnValue!
+            }
+        }
+        set {
+            if Thread.isMainThread {
+                canUserUserIDSendMessageUnderlyingCallsCount = newValue
+            } else {
+                DispatchQueue.main.sync {
+                    canUserUserIDSendMessageUnderlyingCallsCount = newValue
+                }
+            }
+        }
+    }
+    var canUserUserIDSendMessageCalled: Bool {
+        return canUserUserIDSendMessageCallsCount > 0
+    }
+    var canUserUserIDSendMessageReceivedArguments: (userID: String, messageType: MessageLikeEventType)?
+    var canUserUserIDSendMessageReceivedInvocations: [(userID: String, messageType: MessageLikeEventType)] = []
+
+    var canUserUserIDSendMessageUnderlyingReturnValue: Result<Bool, RoomProxyError>!
+    var canUserUserIDSendMessageReturnValue: Result<Bool, RoomProxyError>! {
+        get {
+            if Thread.isMainThread {
+                return canUserUserIDSendMessageUnderlyingReturnValue
+            } else {
+                var returnValue: Result<Bool, RoomProxyError>? = nil
+                DispatchQueue.main.sync {
+                    returnValue = canUserUserIDSendMessageUnderlyingReturnValue
+                }
+
+                return returnValue!
+            }
+        }
+        set {
+            if Thread.isMainThread {
+                canUserUserIDSendMessageUnderlyingReturnValue = newValue
+            } else {
+                DispatchQueue.main.sync {
+                    canUserUserIDSendMessageUnderlyingReturnValue = newValue
+                }
+            }
+        }
+    }
+    var canUserUserIDSendMessageClosure: ((String, MessageLikeEventType) async -> Result<Bool, RoomProxyError>)?
+
+    func canUser(userID: String, sendMessage messageType: MessageLikeEventType) async -> Result<Bool, RoomProxyError> {
+        canUserUserIDSendMessageCallsCount += 1
+        canUserUserIDSendMessageReceivedArguments = (userID: userID, messageType: messageType)
+        DispatchQueue.main.async {
+            self.canUserUserIDSendMessageReceivedInvocations.append((userID: userID, messageType: messageType))
+        }
+        if let canUserUserIDSendMessageClosure = canUserUserIDSendMessageClosure {
+            return await canUserUserIDSendMessageClosure(userID, messageType)
+        } else {
+            return canUserUserIDSendMessageReturnValue
+        }
+    }
+    //MARK: - canUser
+
     var canUserUserIDSendStateEventUnderlyingCallsCount = 0
     var canUserUserIDSendStateEventCallsCount: Int {
         get {

ElementX/Sources/Mocks/JoinedRoomProxyMock.swift

@@ -36,6 +36,7 @@ struct JoinedRoomProxyMockConfiguration {
     var ownUserID = RoomMemberProxyMock.mockMe.userID
     var inviter: RoomMemberProxyProtocol?
     
+    var canUserSendMessage = true
     var canUserInvite = true
     var canUserTriggerRoomNotification = false
     var canUserJoinCall = true
@@ -91,6 +92,7 @@ extension JoinedRoomProxyMock {
             return .success(member.role)
         }
         updatePowerLevelsForUsersReturnValue = .success(())
+        canUserUserIDSendMessageReturnValue = .success(configuration.canUserSendMessage)
         canUserUserIDSendStateEventClosure = { [weak self] userID, _ in
             .success(self?.membersPublisher.value.first { $0.userID == userID }?.role ?? .user != .user)
         }

ElementX/Sources/Screens/RoomScreen/RoomScreenModels.swift

@@ -40,6 +40,7 @@ struct RoomScreenViewState: BindableState {
         !pinnedEventsBannerState.isEmpty && lastScrollDirection != .top
     }
     
+    var canSendMessage = true
     var canJoinCall = false
     var hasOngoingCall: Bool
     var shouldShowCallButton = true

ElementX/Sources/Screens/RoomScreen/RoomScreenViewModel.swift

@@ -340,6 +340,7 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
         }
         
         let ownUserID = roomProxy.ownUserID
+        state.canSendMessage = await (try? roomProxy.canUser(userID: ownUserID, sendMessage: .roomMessage).get()) == true
         state.canJoinCall = await (try? roomProxy.canUserJoinCall(userID: ownUserID).get()) == true
         state.canAcceptKnocks = await (try? roomProxy.canUserInvite(userID: ownUserID).get()) == true
         state.canDeclineKnocks = await (try? roomProxy.canUserKick(userID: ownUserID).get()) == true

ElementX/Sources/Screens/RoomScreen/View/RoomScreen.swift

@@ -42,7 +42,7 @@ struct RoomScreen: View {
                         roomContext.send(viewAction: .footerViewAction(action))
                     }
                     
-                    composerToolbar
+                    composer
                         .padding(.bottom, composerToolbarContext.composerFormattingEnabled ? 8 : 12)
                         .background {
                             if composerToolbarContext.composerFormattingEnabled {
@@ -188,6 +188,19 @@ struct RoomScreen: View {
         timelineContext.isScrolledToBottom && timelineContext.viewState.timelineState.isLive
     }
     
+    @ViewBuilder
+    private var composer: some View {
+        if roomContext.viewState.canSendMessage {
+            composerToolbar
+        } else {
+            Text(L10n.screenRoomTimelineNoPermissionToPost)
+                .font(.compound.bodyLG)
+                .foregroundStyle(.compound.textDisabled)
+                .multilineTextAlignment(.center)
+                .padding(.vertical, 10) // Matches the MessageComposerStyleModifier
+        }
+    }
+    
     @ViewBuilder
     private var loadingIndicator: some View {
         if timelineContext.viewState.showLoading {
@@ -257,28 +270,50 @@ struct RoomScreen: View {
 // MARK: - Previews
 
 struct RoomScreen_Previews: PreviewProvider, TestablePreview {
-    static let roomProxyMock = JoinedRoomProxyMock(.init(id: "stable_id",
+    static let viewModels = makeViewModels()
-                                                         name: "Preview room",
+    static let readOnlyViewModels = makeViewModels(canSendMessage: false)
-                                                         hasOngoingCall: true))
-    static let roomViewModel = RoomScreenViewModel.mock(roomProxyMock: roomProxyMock)
-    static let timelineViewModel = TimelineViewModel(roomProxy: roomProxyMock,
-                                                     timelineController: MockTimelineController(),
-                                                     mediaProvider: MediaProviderMock(configuration: .init()),
-                                                     mediaPlayerProvider: MediaPlayerProviderMock(),
-                                                     voiceMessageMediaManager: VoiceMessageMediaManagerMock(),
-                                                     userIndicatorController: ServiceLocator.shared.userIndicatorController,
-                                                     appMediator: AppMediatorMock.default,
-                                                     appSettings: ServiceLocator.shared.settings,
-                                                     analyticsService: ServiceLocator.shared.analytics,
-                                                     emojiProvider: EmojiProvider(appSettings: ServiceLocator.shared.settings),
-                                                     timelineControllerFactory: TimelineControllerFactoryMock(.init()),
-                                                     clientProxy: ClientProxyMock(.init()))
 
     static var previews: some View {
         NavigationStack {
-            RoomScreen(roomViewModel: roomViewModel,
+            RoomScreen(roomViewModel: viewModels.room,
-                       timelineViewModel: timelineViewModel,
+                       timelineViewModel: viewModels.timeline,
                        composerToolbar: ComposerToolbar.mock())
         }
+        .previewDisplayName("Normal")
+        
+        NavigationStack {
+            RoomScreen(roomViewModel: readOnlyViewModels.room,
+                       timelineViewModel: readOnlyViewModels.timeline,
+                       composerToolbar: ComposerToolbar.mock())
+        }
+        .previewDisplayName("Read-only")
+        .snapshotPreferences(expect: readOnlyViewModels.room.context.$viewState.map { !$0.canSendMessage })
+    }
+    
+    static func makeViewModels(canSendMessage: Bool = true) -> ViewModels {
+        let roomProxyMock = JoinedRoomProxyMock(.init(id: "stable_id",
+                                                      name: "Preview room",
+                                                      hasOngoingCall: true,
+                                                      canUserSendMessage: canSendMessage))
+        let roomViewModel = RoomScreenViewModel.mock(roomProxyMock: roomProxyMock)
+        let timelineViewModel = TimelineViewModel(roomProxy: roomProxyMock,
+                                                  timelineController: MockTimelineController(),
+                                                  mediaProvider: MediaProviderMock(configuration: .init()),
+                                                  mediaPlayerProvider: MediaPlayerProviderMock(),
+                                                  voiceMessageMediaManager: VoiceMessageMediaManagerMock(),
+                                                  userIndicatorController: ServiceLocator.shared.userIndicatorController,
+                                                  appMediator: AppMediatorMock.default,
+                                                  appSettings: ServiceLocator.shared.settings,
+                                                  analyticsService: ServiceLocator.shared.analytics,
+                                                  emojiProvider: EmojiProvider(appSettings: ServiceLocator.shared.settings),
+                                                  timelineControllerFactory: TimelineControllerFactoryMock(.init()),
+                                                  clientProxy: ClientProxyMock(.init()))
+        
+        return .init(room: roomViewModel, timeline: timelineViewModel)
+    }
+    
+    struct ViewModels {
+        let room: RoomScreenViewModelProtocol
+        let timeline: TimelineViewModelProtocol
     }
 }

ElementX/Sources/Services/Room/JoinedRoomProxy.swift

@@ -559,6 +559,15 @@ class JoinedRoomProxy: JoinedRoomProxyProtocol {
         }
     }
     
+    func canUser(userID: String, sendMessage messageType: MessageLikeEventType) async -> Result<Bool, RoomProxyError> {
+        do {
+            return try await .success(room.canUserSendMessage(userId: userID, message: messageType))
+        } catch {
+            MXLog.error("Failed checking if the user can send message with error: \(error)")
+            return .failure(.sdkError(error))
+        }
+    }
+    
     func canUser(userID: String, sendStateEvent event: StateEventType) async -> Result<Bool, RoomProxyError> {
         do {
             return try await .success(room.canUserSendState(userId: userID, stateEvent: event))

ElementX/Sources/Services/Room/RoomProxyProtocol.swift

@@ -150,6 +150,7 @@ protocol JoinedRoomProxyProtocol: RoomProxyProtocol {
     func resetPowerLevels() async -> Result<RoomPowerLevels, RoomProxyError>
     func suggestedRole(for userID: String) async -> Result<RoomMemberRole, RoomProxyError>
     func updatePowerLevelsForUsers(_ updates: [(userID: String, powerLevel: Int64)]) async -> Result<Void, RoomProxyError>
+    func canUser(userID: String, sendMessage messageType: MessageLikeEventType) async -> Result<Bool, RoomProxyError>
     func canUser(userID: String, sendStateEvent event: StateEventType) async -> Result<Bool, RoomProxyError>
     func canUserInvite(userID: String) async -> Result<Bool, RoomProxyError>
     func canUserRedactOther(userID: String) async -> Result<Bool, RoomProxyError>

PreviewTests/Sources/__Snapshots__/PreviewTests/roomScreen.Read-only-iPad-en-GB.png

@@ -0,0 +1,3 @@
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+size 296108

PreviewTests/Sources/__Snapshots__/PreviewTests/roomScreen.Read-only-iPad-pseudo.png

@@ -0,0 +1,3 @@
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+oid sha256:6c8f9d9ad5dfe6a949e392eb6a2014a26fa1c99dcd1609eebacf9fa3129f1ced
+size 306552

PreviewTests/Sources/__Snapshots__/PreviewTests/roomScreen.Read-only-iPhone-16-en-GB.png

@@ -0,0 +1,3 @@
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+oid sha256:bcc07c762ebeab3cb9de5c0e516fb47704a7309e28c6bbbd335e07692e55ccfa
+size 182334

PreviewTests/Sources/__Snapshots__/PreviewTests/roomScreen.Read-only-iPhone-16-pseudo.png

@@ -0,0 +1,3 @@
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+size 184921