From 3923d65b41e81e8147c68ba27d8a9ca6bc53ae13 Mon Sep 17 00:00:00 2001
From: Stefan Ceriu <stefanc@matrix.org>
Date: Tue, 3 Jun 2025 17:52:55 +0300
Subject: [PATCH] Disable the threaded timeline composer when the room is read
 only.

---
 .../ThreadTimelineScreenCoordinator.swift     |  2 +-
 .../ThreadTimelineScreenModels.swift          |  2 ++
 .../ThreadTimelineScreenViewModel.swift       | 29 +++++++++++++++++--
 .../View/ThreadTimelineScreen.swift           | 19 ++++++------
 4 files changed, 39 insertions(+), 13 deletions(-)

diff --git a/ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenCoordinator.swift b/ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenCoordinator.swift
index e82a2fc73..4fd35109a 100644
--- a/ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenCoordinator.swift
+++ b/ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenCoordinator.swift
@@ -55,7 +55,7 @@ final class ThreadTimelineScreenCoordinator: CoordinatorProtocol {
     init(parameters: ThreadTimelineScreenCoordinatorParameters) {
         self.parameters = parameters
         
-        viewModel = ThreadTimelineScreenViewModel()
+        viewModel = ThreadTimelineScreenViewModel(roomProxy: parameters.roomProxy)
         
         timelineViewModel = TimelineViewModel(roomProxy: parameters.roomProxy,
                                               timelineController: parameters.timelineController,
diff --git a/ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenModels.swift b/ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenModels.swift
index d4bc7c619..24c01a6f3 100644
--- a/ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenModels.swift
+++ b/ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenModels.swift
@@ -10,6 +10,8 @@ import Foundation
 enum ThreadTimelineScreenViewModelAction { }
 
 struct ThreadTimelineScreenViewState: BindableState {
+    var canSendMessage = true
+    
     var bindings = ThreadTimelineScreenViewStateBindings()
 }
 
diff --git a/ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenViewModel.swift b/ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenViewModel.swift
index ac8dc2415..66b58fa73 100644
--- a/ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenViewModel.swift
+++ b/ElementX/Sources/Screens/ThreadTimelineScreen/ThreadTimelineScreenViewModel.swift
@@ -11,13 +11,32 @@ import SwiftUI
 typealias ThreadTimelineScreenViewModelType = StateStoreViewModel<ThreadTimelineScreenViewState, ThreadTimelineScreenViewAction>
 
 class ThreadTimelineScreenViewModel: ThreadTimelineScreenViewModelType, ThreadTimelineScreenViewModelProtocol {
+    private let roomProxy: JoinedRoomProxyProtocol
+    
     private let actionsSubject: PassthroughSubject<ThreadTimelineScreenViewModelAction, Never> = .init()
     var actionsPublisher: AnyPublisher<ThreadTimelineScreenViewModelAction, Never> {
         actionsSubject.eraseToAnyPublisher()
     }
-
-    init() {
+    
+    init(roomProxy: JoinedRoomProxyProtocol) {
+        self.roomProxy = roomProxy
+        
         super.init(initialViewState: ThreadTimelineScreenViewState())
+        
+        Task { [weak self] in
+            for await roomInfo in roomProxy.infoPublisher.receive(on: DispatchQueue.main).values {
+                guard !Task.isCancelled else {
+                    return
+                }
+                
+                await self?.handleRoomInfoUpdate(roomInfo)
+            }
+        }
+        .store(in: &cancellables)
+        
+        Task {
+            await handleRoomInfoUpdate(roomProxy.infoPublisher.value)
+        }
     }
     
     // MARK: - Public
@@ -42,4 +61,10 @@ class ThreadTimelineScreenViewModel: ThreadTimelineScreenViewModelType, ThreadTi
         
         state.bindings.mediaPreviewViewModel = mediaPreviewViewModel
     }
+    
+    // MARK: - Private
+    
+    private func handleRoomInfoUpdate(_ roomInfo: RoomInfoProxy) async {
+        state.canSendMessage = await (try? roomProxy.canUser(userID: roomProxy.ownUserID, sendMessage: .roomMessage).get()) == true
+    }
 }
diff --git a/ElementX/Sources/Screens/ThreadTimelineScreen/View/ThreadTimelineScreen.swift b/ElementX/Sources/Screens/ThreadTimelineScreen/View/ThreadTimelineScreen.swift
index 252cf367f..d9d8a8e22 100644
--- a/ElementX/Sources/Screens/ThreadTimelineScreen/View/ThreadTimelineScreen.swift
+++ b/ElementX/Sources/Screens/ThreadTimelineScreen/View/ThreadTimelineScreen.swift
@@ -64,16 +64,15 @@ struct ThreadTimelineScreen: View {
     
     @ViewBuilder
     private var composer: some View {
-        #warning("Check permissions here too")
-//        if roomContext.viewState.canSendMessage {
-        composerToolbar
-//        } else {
-//            Text(L10n.screenRoomTimelineNoPermissionToPost)
-//                .font(.compound.bodyLG)
-//                .foregroundStyle(.compound.textDisabled)
-//                .multilineTextAlignment(.center)
-//                .padding(.vertical, 10) // Matches the MessageComposerStyleModifier
-//        }
+        if context.viewState.canSendMessage {
+            composerToolbar
+        } else {
+            Text(L10n.screenRoomTimelineNoPermissionToPost)
+                .font(.compound.bodyLG)
+                .foregroundStyle(.compound.textDisabled)
+                .multilineTextAlignment(.center)
+                .padding(.vertical, 10) // Matches the MessageComposerStyleModifier
+        }
     }
     
     private var scrollToBottomButton: some View {