Tweak internal/external deeplink handling (#2664)

* Add a childRoom AppRoute.

* Add a tests for child room routes.

ElementX/Sources/Application/AppCoordinator.swift

@@ -176,7 +176,7 @@ class AppCoordinator: AppCoordinatorProtocol, AuthenticationFlowCoordinatorDeleg
         )
     }
     
-    func handleDeepLink(_ url: URL) -> Bool {
+    func handleDeepLink(_ url: URL, isExternalURL: Bool) -> Bool {
         // Parse into an AppRoute to redirect these in a type safe way.
         
         if let route = appRouteURLParser.route(from: url) {
@@ -193,8 +193,14 @@ class AppCoordinator: AppCoordinatorProtocol, AuthenticationFlowCoordinatorDeleg
                 } else {
                     navigationRootCoordinator.setSheetCoordinator(GenericCallLinkCoordinator(parameters: .init(url: url)))
                 }
-            case .roomMemberDetails, .room:
+            case .roomMemberDetails:
                 userSessionFlowCoordinator?.handleAppRoute(route, animated: true)
+            case .room(let roomID):
+                if isExternalURL {
+                    userSessionFlowCoordinator?.handleAppRoute(route, animated: true)
+                } else {
+                    userSessionFlowCoordinator?.handleAppRoute(.childRoom(roomID: roomID), animated: true)
+                }
             default:
                 break
             }

ElementX/Sources/Application/AppCoordinatorProtocol.swift

@@ -18,5 +18,5 @@ import Foundation
 
 protocol AppCoordinatorProtocol: CoordinatorProtocol {
     var windowManager: WindowManagerProtocol { get }
-    @discardableResult func handleDeepLink(_ url: URL) -> Bool
+    @discardableResult func handleDeepLink(_ url: URL, isExternalURL: Bool) -> Bool
 }

ElementX/Sources/Application/Application.swift

@@ -40,14 +40,14 @@ struct Application: App {
             appCoordinator.toPresentable()
                 .statusBarHidden(shouldHideStatusBar)
                 .environment(\.openURL, OpenURLAction { url in
-                    if appCoordinator.handleDeepLink(url) {
+                    if appCoordinator.handleDeepLink(url, isExternalURL: false) {
                         return .handled
                     }
 
                     return .systemAction
                 })
                 .onOpenURL {
-                    if !appCoordinator.handleDeepLink($0) {
+                    if !appCoordinator.handleDeepLink($0, isExternalURL: true) {
                         openURLInSystemBrowser($0)
                     }
                 }

ElementX/Sources/Application/Navigation/AppRoutes.swift

@@ -17,13 +17,24 @@
 import Foundation
 
 enum AppRoute: Equatable {
+    /// The callback used to complete login with OIDC.
     case oidcCallback(url: URL)
+    /// The app's home screen.
     case roomList
+    /// A room, shown as the root of the stack (popping any child rooms).
     case room(roomID: String)
+    /// A room, pushed as a child of any existing rooms on the stack.
+    case childRoom(roomID: String)
+    /// The information about a particular room.
     case roomDetails(roomID: String)
+    /// The profile of a member within the current room.
+    /// (This can be specialised into 2 routes when we support user permalinks).
     case roomMemberDetails(userID: String)
+    /// An Element Call link generated outside of a chat room.
     case genericCallLink(url: URL)
+    /// The settings screen.
     case settings
+    /// The setting screen for key backup.
     case chatBackupSettings
 }
 

ElementX/Sources/FlowCoordinators/RoomFlowCoordinator.swift

@@ -109,13 +109,24 @@ class RoomFlowCoordinator: FlowCoordinatorProtocol {
         case .room(let roomID):
             guard roomID == roomProxy.id else { fatalError("Navigation route doesn't belong to this room flow.") }
             stateMachine.tryEvent(.presentRoom, userInfo: EventUserInfo(animated: animated))
+        case .childRoom(let roomID):
+            if case .presentingChild = stateMachine.state, let childRoomFlowCoordinator {
+                childRoomFlowCoordinator.handleAppRoute(appRoute, animated: animated)
+            } else {
+                stateMachine.tryEvent(.presentChildRoom(roomID: roomID), userInfo: EventUserInfo(animated: animated))
+            }
         case .roomDetails(let roomID):
             guard roomID == roomProxy.id else { fatalError("Navigation route doesn't belong to this room flow.") }
             stateMachine.tryEvent(.presentRoomDetails, userInfo: EventUserInfo(animated: animated))
         case .roomList:
             stateMachine.tryEvent(.dismissRoom, userInfo: EventUserInfo(animated: animated))
         case .roomMemberDetails(let userID):
+            // Always assume this will be presented on the child, external permalinks to a user aren't for a room member.
+            if case .presentingChild = stateMachine.state, let childRoomFlowCoordinator {
+                childRoomFlowCoordinator.handleAppRoute(appRoute, animated: animated)
+            } else {
                 stateMachine.tryEvent(.presentRoomMemberDetails(userID: userID), userInfo: EventUserInfo(animated: animated))
+            }
         case .genericCallLink, .oidcCallback, .settings, .chatBackupSettings:
             break
         }
@@ -136,7 +147,7 @@ class RoomFlowCoordinator: FlowCoordinatorProtocol {
             switch (fromState, event) {
             case (_, .presentRoom):
                 return .room
-            case (.room, .dismissRoom):
+            case (_, .dismissRoom):
                 return .complete
                 
             case (.initial, .presentRoomDetails):
@@ -145,8 +156,6 @@ class RoomFlowCoordinator: FlowCoordinatorProtocol {
                 return .roomDetails(isRoot: false)
             case (.roomDetails, .dismissRoomDetails):
                 return .room
-            case (.roomDetails, .dismissRoom):
-                return .complete
                 
             case (.roomDetails, .presentRoomDetailsEditScreen):
                 return .roomDetailsEditScreen
@@ -254,7 +263,7 @@ class RoomFlowCoordinator: FlowCoordinatorProtocol {
             switch (context.fromState, context.event, context.toState) {
             case (_, .presentRoom, .room):
                 Task { await self.presentRoom(animated: animated) }
-            case (.room, .dismissRoom, .complete):
+            case (_, .dismissRoom, .complete):
                 dismissFlow(animated: animated)
             
             case (.initial, .presentRoomDetails, .roomDetails(let isRoot)),
@@ -263,8 +272,6 @@ class RoomFlowCoordinator: FlowCoordinatorProtocol {
                 Task { await self.presentRoomDetails(isRoot: isRoot, animated: animated) }
             case (.roomDetails, .dismissRoomDetails, .room):
                 break
-            case (.roomDetails, .dismissRoom, .complete):
-                dismissFlow(animated: animated)
                 
             case (.roomDetails, .presentRoomDetailsEditScreen, .roomDetailsEditScreen):
                 presentRoomDetailsEditScreen()

ElementX/Sources/FlowCoordinators/UserSessionFlowCoordinator.swift

@@ -179,6 +179,12 @@ class UserSessionFlowCoordinator: FlowCoordinatorProtocol {
             switch appRoute {
             case .room(let roomID):
                 Task { await self.handleRoomRoute(roomID: roomID, animated: animated) }
+            case .childRoom(let roomID):
+                if let roomFlowCoordinator {
+                    roomFlowCoordinator.handleAppRoute(appRoute, animated: animated)
+                } else {
+                    Task { await self.handleRoomRoute(roomID: roomID, animated: animated) }
+                }
             case .roomDetails(let roomID):
                 if stateMachine.state.selectedRoomID == roomID {
                     roomFlowCoordinator?.handleAppRoute(appRoute, animated: animated)

ElementX/Sources/UITests/UITestsAppCoordinator.swift

@@ -66,7 +66,7 @@ class UITestsAppCoordinator: AppCoordinatorProtocol, WindowManagerDelegate {
         navigationRootCoordinator.toPresentable()
     }
     
-    func handleDeepLink(_ url: URL) -> Bool {
+    func handleDeepLink(_ url: URL, isExternalURL: Bool) -> Bool {
         fatalError("Not implemented.")
     }
     

ElementX/Sources/UnitTests/UnitTestsAppCoordinator.swift

@@ -38,7 +38,7 @@ class UnitTestsAppCoordinator: AppCoordinatorProtocol {
         AnyView(ProgressView("Running Unit Tests"))
     }
     
-    func handleDeepLink(_ url: URL) -> Bool {
+    func handleDeepLink(_ url: URL, isExternalURL: Bool) -> Bool {
         fatalError("Not implemented.")
     }
 }

UnitTests/Sources/RoomFlowCoordinatorTests.swift

@@ -72,6 +72,30 @@ class RoomFlowCoordinatorTests: XCTestCase {
         XCTAssert(navigationStackCoordinator.stackCoordinators.first is RoomDetailsScreenCoordinator)
     }
     
+    func testChildRoomFlow() async throws {
+        await setupViewModel()
+        
+        try await process(route: .room(roomID: "1"))
+        XCTAssert(navigationStackCoordinator.rootCoordinator is RoomScreenCoordinator)
+        XCTAssertEqual(navigationStackCoordinator.stackCoordinators.count, 0)
+        
+        try await process(route: .childRoom(roomID: "2"))
+        try await Task.sleep(for: .milliseconds(100))
+        XCTAssertEqual(navigationStackCoordinator.stackCoordinators.count, 1)
+        XCTAssert(navigationStackCoordinator.stackCoordinators.first is RoomScreenCoordinator)
+        
+        try await process(route: .childRoom(roomID: "3"))
+        try await Task.sleep(for: .milliseconds(100))
+        XCTAssertEqual(navigationStackCoordinator.stackCoordinators.count, 2)
+        XCTAssert(navigationStackCoordinator.stackCoordinators.first is RoomScreenCoordinator)
+        XCTAssert(navigationStackCoordinator.stackCoordinators.last is RoomScreenCoordinator)
+        
+        try await process(route: .roomList, expectedAction: .finished)
+        XCTAssertNil(navigationStackCoordinator.rootCoordinator)
+        XCTAssertEqual(navigationStackCoordinator.stackCoordinators.count, 0)
+    }
+    
+    /// Tests the child flow teardown in isolation of it's parent.
     func testChildFlowTearDown() async throws {
         await setupViewModel(asChildFlow: true)
         navigationStackCoordinator.setRootCoordinator(BlankFormCoordinator())
@@ -90,6 +114,24 @@ class RoomFlowCoordinatorTests: XCTestCase {
         XCTAssertTrue(navigationStackCoordinator.stackCoordinators.last is RoomDetailsScreenCoordinator, "A child room flow should leave its parent to clean up the stack.")
     }
     
+    func testChildRoomMemberDetails() async throws {
+        await setupViewModel()
+        
+        try await process(route: .room(roomID: "1"))
+        XCTAssert(navigationStackCoordinator.rootCoordinator is RoomScreenCoordinator)
+        XCTAssertEqual(navigationStackCoordinator.stackCoordinators.count, 0)
+        
+        try await process(route: .childRoom(roomID: "2"))
+        try await Task.sleep(for: .milliseconds(100))
+        XCTAssertEqual(navigationStackCoordinator.stackCoordinators.count, 1)
+        XCTAssert(navigationStackCoordinator.stackCoordinators.first is RoomScreenCoordinator)
+        
+        try await process(route: .roomMemberDetails(userID: RoomMemberProxyMock.mockMe.userID))
+        XCTAssertEqual(navigationStackCoordinator.stackCoordinators.count, 2)
+        XCTAssert(navigationStackCoordinator.stackCoordinators.first is RoomScreenCoordinator)
+        XCTAssert(navigationStackCoordinator.stackCoordinators.last is RoomMemberDetailsScreenCoordinator)
+    }
+    
     // MARK: - Private
     
     private func process(route: AppRoute) async throws {