Add encryption history banner and update session verification banner strings. (#1250)

* Add a hard wall on back-pagination in encrypted rooms.
Until the app supports key backup, the history will never be decryptable.

* Fix initial display of the timeline table view.

* Update session verification banner strings.

ElementX.xcodeproj/project.pbxproj

@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
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 	objects = {
 
 /* Begin PBXBuildFile section */
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@@ -440,7 +441,6 @@
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 		B064D42BA087649ACAE462E8 /* SoftLogoutUITests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 55F30E764BED111C81739844 /* SoftLogoutUITests.swift */; };
+		B09DC6E3D0EE87C4D4ABFAB3 /* EncryptedHistoryRoomTimelineItem.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0140615D2232612C813FD6C /* EncryptedHistoryRoomTimelineItem.swift */; };
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@@ -665,6 +666,7 @@
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+		EDC1031A7CFB3406A9DA3175 /* AnalyticsLocationType.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4AD6299F4516797E9BBE14C3 /* AnalyticsLocationType.swift */; };
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@@ -826,7 +828,7 @@
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-		1304D9191300873EADA52D6E /* IntegrationTests.xctestplan */ = {isa = PBXFileReference; lastKnownFileType = text; path = IntegrationTests.xctestplan; sourceTree = "<group>"; };
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@@ -961,7 +963,7 @@
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 		47F29139BC2A804CE5E0757E /* MediaUploadPreviewScreenViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MediaUploadPreviewScreenViewModel.swift; sourceTree = "<group>"; };
@@ -970,6 +972,7 @@
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 		4AB7D7DAAAF662DED9D02379 /* MockMediaLoader.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MockMediaLoader.swift; sourceTree = "<group>"; };
+		4AD6299F4516797E9BBE14C3 /* AnalyticsLocationType.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AnalyticsLocationType.swift; sourceTree = "<group>"; };
 		4B41FABA2B0AEF4389986495 /* LoginMode.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LoginMode.swift; sourceTree = "<group>"; };
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@@ -1082,6 +1085,7 @@
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 		74DD0855F2F76D47E5555082 /* MediaUploadPreviewScreenCoordinator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MediaUploadPreviewScreenCoordinator.swift; sourceTree = "<group>"; };
+		75697AB5E64A12F1F069F511 /* EncryptedHistoryRoomTimelineView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EncryptedHistoryRoomTimelineView.swift; sourceTree = "<group>"; };
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 		78910787F967CBC6042A101E /* StartChatScreenViewModelProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StartChatScreenViewModelProtocol.swift; sourceTree = "<group>"; };
@@ -1128,7 +1132,7 @@
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 		8DC2C9E0E15C79BBDA80F0A2 /* TimelineStyle.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TimelineStyle.swift; sourceTree = "<group>"; };
-		8E088F2A1B9EC529D3221931 /* UITests.xctestplan */ = {isa = PBXFileReference; lastKnownFileType = text; path = UITests.xctestplan; sourceTree = "<group>"; };
+		8E088F2A1B9EC529D3221931 /* UITests.xctestplan */ = {isa = PBXFileReference; path = UITests.xctestplan; sourceTree = "<group>"; };
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 		8EC57A32ABC80D774CC663DB /* SettingsScreenUITests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingsScreenUITests.swift; sourceTree = "<group>"; };
 		8F21ED7205048668BEB44A38 /* AppActivityView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppActivityView.swift; sourceTree = "<group>"; };
@@ -1172,7 +1176,6 @@
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 		9F85164F9475FF2867F71AAA /* RoomTimelineController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RoomTimelineController.swift; sourceTree = "<group>"; };
-		A002DDF02A557DFF00228A9F /* AnalyticsLocationType.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AnalyticsLocationType.swift; sourceTree = "<group>"; };
 		A00C7A331B72C0F05C00392F /* RoomScreenViewModelProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RoomScreenViewModelProtocol.swift; sourceTree = "<group>"; };
 		A05707BF550D770168A406DB /* LoginViewModelTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LoginViewModelTests.swift; sourceTree = "<group>"; };
 		A057F2FDC14866C3026A89A4 /* NotificationManagerProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NotificationManagerProtocol.swift; sourceTree = "<group>"; };
@@ -1235,7 +1238,7 @@
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 		B5B243E7818E5E9F6A4EDC7A /* NoticeRoomTimelineView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NoticeRoomTimelineView.swift; sourceTree = "<group>"; };
-		B61C339A2FDDBD067FF6635C /* ConfettiScene.scn */ = {isa = PBXFileReference; lastKnownFileType = file.bplist; path = ConfettiScene.scn; sourceTree = "<group>"; };
+		B61C339A2FDDBD067FF6635C /* ConfettiScene.scn */ = {isa = PBXFileReference; path = ConfettiScene.scn; sourceTree = "<group>"; };
 		B6311F21F911E23BE4DF51B4 /* ReadMarkerRoomTimelineView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ReadMarkerRoomTimelineView.swift; sourceTree = "<group>"; };
 		B697816AF93DA06EC58C5D70 /* WaitlistScreenViewModelProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WaitlistScreenViewModelProtocol.swift; sourceTree = "<group>"; };
 		B6E89E530A8E92EC44301CA1 /* Bundle.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Bundle.swift; sourceTree = "<group>"; };
@@ -1312,8 +1315,9 @@
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 		CDB3227C7A74B734924942E9 /* RoomSummaryProvider.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RoomSummaryProvider.swift; sourceTree = "<group>"; };
 		CEE0E6043EFCF6FD2A341861 /* TimelineReplyView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TimelineReplyView.swift; sourceTree = "<group>"; };
-		CEE41494C837AA403A06A5D9 /* UnitTests.xctestplan */ = {isa = PBXFileReference; lastKnownFileType = text; path = UnitTests.xctestplan; sourceTree = "<group>"; };
+		CEE41494C837AA403A06A5D9 /* UnitTests.xctestplan */ = {isa = PBXFileReference; path = UnitTests.xctestplan; sourceTree = "<group>"; };
 		CF48AF076424DBC1615C74AD /* AuthenticationServiceProxy.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AuthenticationServiceProxy.swift; sourceTree = "<group>"; };
+		D0140615D2232612C813FD6C /* EncryptedHistoryRoomTimelineItem.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EncryptedHistoryRoomTimelineItem.swift; sourceTree = "<group>"; };
 		D071F86CD47582B9196C9D16 /* UserDiscoverySection.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UserDiscoverySection.swift; sourceTree = "<group>"; };
 		D09A267106B9585D3D0CFC0D /* ClientError.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ClientError.swift; sourceTree = "<group>"; };
 		D0A45283CF1DB96E583BECA6 /* ImageRoomTimelineView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ImageRoomTimelineView.swift; sourceTree = "<group>"; };
@@ -1382,7 +1386,7 @@
 		ECF79FB25E2D4BD6F50CE7C9 /* RoomMembersListScreenViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RoomMembersListScreenViewModel.swift; sourceTree = "<group>"; };
 		ED044D00F2176681CC02CD54 /* HomeScreenRoomCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HomeScreenRoomCell.swift; sourceTree = "<group>"; };
 		ED1D792EB82506A19A72C8DE /* RoomTimelineItemProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RoomTimelineItemProtocol.swift; sourceTree = "<group>"; };
-		ED482057AE39D5C6D9C5F3D8 /* message.caf */ = {isa = PBXFileReference; lastKnownFileType = file; path = message.caf; sourceTree = "<group>"; };
+		ED482057AE39D5C6D9C5F3D8 /* message.caf */ = {isa = PBXFileReference; path = message.caf; sourceTree = "<group>"; };
 		ED983D4DCA5AFA6E1ED96099 /* StateRoomTimelineView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StateRoomTimelineView.swift; sourceTree = "<group>"; };
 		EDAA4472821985BF868CC21C /* ServerSelectionViewModelTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ServerSelectionViewModelTests.swift; sourceTree = "<group>"; };
 		EE378083653EF0C9B5E9D580 /* EmoteRoomTimelineItemContent.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EmoteRoomTimelineItemContent.swift; sourceTree = "<group>"; };
@@ -2071,7 +2075,7 @@
 				E3B97591B2D3D4D67553506D /* AnalyticsClientProtocol.swift */,
 				D77B3D4950F1707E66E4A45A /* AnalyticsConfiguration.swift */,
 				57B6B383F1FD04CC0E7B60C6 /* AnalyticsConsentState.swift */,
-				A002DDF02A557DFF00228A9F /* AnalyticsLocationType.swift */,
+				4AD6299F4516797E9BBE14C3 /* AnalyticsLocationType.swift */,
 				FEFEEE93B82937B2E86F92EB /* AnalyticsScreen.swift */,
 				5445FCE0CE15E634FDC1A2E2 /* AnalyticsService.swift */,
 				A6B891A6DA826E2461DBB40F /* PHGPostHogConfiguration.swift */,
@@ -3028,6 +3032,7 @@
 				FC2D505742FDA21FCDC4C18A /* AudioRoomTimelineView.swift */,
 				6E2656184491C505700D2405 /* CollapsibleRoomTimelineView.swift */,
 				471EB7D96AFEA8D787659686 /* EmoteRoomTimelineView.swift */,
+				75697AB5E64A12F1F069F511 /* EncryptedHistoryRoomTimelineView.swift */,
 				56C1BCB9E83B09A45387FCA2 /* EncryptedRoomTimelineView.swift */,
 				E51E3D86A84341C3A0CB8A40 /* FileRoomTimelineView.swift */,
 				F73FF1A33198F5FAE9D34B1F /* FormattedBodyText.swift */,
@@ -3223,6 +3228,7 @@
 		D977D4E565C06D3F41C8F8FC /* Virtual */ = {
 			isa = PBXGroup;
 			children = (
+				D0140615D2232612C813FD6C /* EncryptedHistoryRoomTimelineItem.swift */,
 				0B987FC3FDBAA0E1C5AA235C /* PaginationIndicatorRoomTimelineItem.swift */,
 				DF3D25B3EDB283B5807EADCF /* ReadMarkerRoomTimelineItem.swift */,
 				C6A9F49B3EE59147AF2F70BB /* SeparatorRoomTimelineItem.swift */,
@@ -4029,6 +4035,7 @@
 				F7567DD6635434E8C563BF85 /* AnalyticsClientProtocol.swift in Sources */,
 				54C774874BED4A8FAD1F22FE /* AnalyticsConfiguration.swift in Sources */,
 				8DDC6F28C797D8685F2F8E32 /* AnalyticsConsentState.swift in Sources */,
+				EDC1031A7CFB3406A9DA3175 /* AnalyticsLocationType.swift in Sources */,
 				9DF3F6318A4402305F5EB869 /* AnalyticsPromptScreen.swift in Sources */,
 				10516CF20E8B5852F4C444FD /* AnalyticsPromptScreenCheckmarkItem.swift in Sources */,
 				5F28C9146694B381BB82E18C /* AnalyticsPromptScreenCoordinator.swift in Sources */,
@@ -4133,6 +4140,8 @@
 				8B41D0357B91CD3B6F6A3BCA /* EmoteRoomTimelineItemContent.swift in Sources */,
 				68AC3C84E2B438036B174E30 /* EmoteRoomTimelineView.swift in Sources */,
 				8B1D5CE017EEC734CF5FE130 /* Encodable.swift in Sources */,
+				B09DC6E3D0EE87C4D4ABFAB3 /* EncryptedHistoryRoomTimelineItem.swift in Sources */,
+				9965CB800CE6BC74ACA969FC /* EncryptedHistoryRoomTimelineView.swift in Sources */,
 				4C5A638DAA8AF64565BA4866 /* EncryptedRoomTimelineItem.swift in Sources */,
 				B5903E48CF43259836BF2DBF /* EncryptedRoomTimelineView.swift in Sources */,
 				69ABFBAF05D7EF11E7C88CEA /* EncryptionSyncListenerProxy.swift in Sources */,
@@ -4300,7 +4309,6 @@
 				46A261AA898344A1F3C406B1 /* ReportContentScreenModels.swift in Sources */,
 				42A5A42ACF063EEE6B1980D2 /* ReportContentScreenViewModel.swift in Sources */,
 				8285FF4B2C2331758C437FF7 /* ReportContentScreenViewModelProtocol.swift in Sources */,
-				A002DDF12A557DFF00228A9F /* AnalyticsLocationType.swift in Sources */,
 				A494741843F087881299ACF0 /* RestorationToken.swift in Sources */,
 				755EE5B0998C6A4D764D86E5 /* RoomAttachmentPicker.swift in Sources */,
 				0BDA19079FD6E17C5AC62E22 /* RoomDetailsEditScreen.swift in Sources */,

ElementX/Resources/Localizations/en.lproj/Localizable.strings

@@ -283,6 +283,7 @@
 "screen_room_details_room_name_label" = "Room name";
 "screen_room_details_share_room_title" = "Share room";
 "screen_room_details_updating_room" = "Updating room…";
+"screen_room_encrypted_history_banner" = "Message history is currently unavailable in this room";
 "screen_room_error_failed_retrieving_user_details" = "Could not retrieve user details";
 "screen_room_invite_again_alert_message" = "Would you like to invite them back?";
 "screen_room_invite_again_alert_title" = "You are alone in this chat";
@@ -335,8 +336,8 @@
 "screen_waitlist_message_success" = "Welcome to %1$@!";
 "screen_waitlist_title" = "You’re almost there.";
 "screen_waitlist_title_success" = "You're in.";
-"session_verification_banner_message" = "Looks like you’re using a new device. Verify it’s you to access your encrypted messages.";
+"session_verification_banner_message" = "Looks like you’re using a new device. Verify with another device to access your encrypted messages moving forwards.";
-"session_verification_banner_title" = "Access your message history";
+"session_verification_banner_title" = "Verify it’s you";
 "settings_rageshake" = "Rageshake";
 "settings_rageshake_detection_threshold" = "Detection threshold";
 "settings_title_general" = "General";

ElementX/Sources/Application/AppSettings.swift

@@ -22,6 +22,7 @@ final class AppSettings {
     private enum UserDefaultsKeys: String {
         case lastVersionLaunched
         case seenInvites
+        case lastLoginDate
         case migratedAccounts
         case timelineStyle
         case analyticsConsentState
@@ -105,6 +106,13 @@ final class AppSettings {
     /// Any pre-defined static client registrations for OIDC issuers.
     let oidcStaticRegistrations: [URL: String] = ["https://id.thirdroom.io/realms/thirdroom": "elementx"]
 
+    /// The date that the call to `/login` completed successfully. This is used to put
+    /// a hard wall on the history of encrypted messages until we have key backup.
+    ///
+    /// Not a multi-account aware setting as key backup will come before multi-account.
+    @UserPreference(key: UserDefaultsKeys.lastLoginDate, defaultValue: nil, storageType: .userDefaults(store))
+    var lastLoginDate: Date?
+    
     /// A dictionary of accounts that have performed an initial sync through their proxy.
     ///
     /// This is a temporary workaround. In the future we should be able to receive a signal from the

ElementX/Sources/FlowCoordinators/RoomFlowCoordinator.swift

@@ -271,15 +271,14 @@ class RoomFlowCoordinator: FlowCoordinatorProtocol {
         
         self.roomProxy = roomProxy
         
-        let userId = userSession.clientProxy.userID
+        let userID = userSession.clientProxy.userID
         
-        let timelineItemFactory = RoomTimelineItemFactory(userID: userId,
+        let timelineItemFactory = RoomTimelineItemFactory(userID: userID,
                                                           mediaProvider: userSession.mediaProvider,
                                                           attributedStringBuilder: AttributedStringBuilder(permalinkBaseURL: appSettings.permalinkBaseURL),
-                                                          stateEventStringBuilder: RoomStateEventStringBuilder(userID: userId))
+                                                          stateEventStringBuilder: RoomStateEventStringBuilder(userID: userID))
         
-        let timelineController = roomTimelineControllerFactory.buildRoomTimelineController(userId: userId,
+        let timelineController = roomTimelineControllerFactory.buildRoomTimelineController(roomProxy: roomProxy,
-                                                                                           roomProxy: roomProxy,
                                                                                            timelineItemFactory: timelineItemFactory,
                                                                                            mediaProvider: userSession.mediaProvider)
         self.timelineController = timelineController

ElementX/Sources/Generated/Strings.swift

@@ -718,6 +718,8 @@ public enum L10n {
   public static var screenRoomDetailsTopicTitle: String { return L10n.tr("Localizable", "screen_room_details_topic_title") }
   /// Updating room…
   public static var screenRoomDetailsUpdatingRoom: String { return L10n.tr("Localizable", "screen_room_details_updating_room") }
+  /// Message history is currently unavailable in this room
+  public static var screenRoomEncryptedHistoryBanner: String { return L10n.tr("Localizable", "screen_room_encrypted_history_banner") }
   /// Failed processing media to upload, please try again.
   public static var screenRoomErrorFailedProcessingMedia: String { return L10n.tr("Localizable", "screen_room_error_failed_processing_media") }
   /// Could not retrieve user details
@@ -848,9 +850,9 @@ public enum L10n {
   public static var screenWaitlistTitle: String { return L10n.tr("Localizable", "screen_waitlist_title") }
   /// You're in.
   public static var screenWaitlistTitleSuccess: String { return L10n.tr("Localizable", "screen_waitlist_title_success") }
-  /// Looks like you’re using a new device. Verify it’s you to access your encrypted messages.
+  /// Looks like you’re using a new device. Verify with another device to access your encrypted messages moving forwards.
   public static var sessionVerificationBannerMessage: String { return L10n.tr("Localizable", "session_verification_banner_message") }
-  /// Access your message history
+  /// Verify it’s you
   public static var sessionVerificationBannerTitle: String { return L10n.tr("Localizable", "session_verification_banner_title") }
   /// Rageshake
   public static var settingsRageshake: String { return L10n.tr("Localizable", "settings_rageshake") }

ElementX/Sources/Screens/Authentication/AuthenticationCoordinator.swift

@@ -205,6 +205,8 @@ class AuthenticationCoordinator: CoordinatorProtocol {
     }
     
     private func userHasSignedIn(userSession: UserSessionProtocol) {
+        appSettings.lastLoginDate = .now
+        
         showAnalyticsPromptIfNeeded { [weak self] in
             guard let self else { return }
             self.delegate?.authenticationCoordinator(self, didLoginWithSession: userSession)

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

@@ -0,0 +1,61 @@
+//
+// Copyright 2023 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import SwiftUI
+
+/// The item shown when all previous items are un-decryptable due to
+/// key backup not yet being supported in the app.
+struct EncryptedHistoryRoomTimelineView: View {
+    let timelineItem: EncryptedHistoryRoomTimelineItem
+    
+    var body: some View {
+        Label {
+            Text(L10n.screenRoomEncryptedHistoryBanner)
+                .font(.compound.bodyMDSemibold)
+                .foregroundColor(.compound.textInfoPrimary)
+        } icon: {
+            Image(systemName: "info.circle.fill")
+                .foregroundColor(.compound.iconInfoPrimary)
+        }
+        .labelStyle(EncryptedHistoryLabelStyle())
+        .padding(16)
+        .background {
+            RoundedRectangle(cornerRadius: 8)
+                .fill(Color.compound.bgInfoSubtle)
+            RoundedRectangle(cornerRadius: 8)
+                .stroke(Color.compound.borderInfoSubtle)
+        }
+        .frame(maxWidth: .infinity)
+        .padding(.horizontal, 8)
+        .padding(.vertical, 16)
+    }
+}
+
+private struct EncryptedHistoryLabelStyle: LabelStyle {
+    func makeBody(configuration: Configuration) -> some View {
+        HStack(alignment: .firstTextBaseline, spacing: 16) {
+            configuration.icon
+            configuration.title
+        }
+    }
+}
+
+struct EncryptedHistoryRoomTimelineView_Previews: PreviewProvider {
+    static var previews: some View {
+        let item = EncryptedHistoryRoomTimelineItem(id: UUID().uuidString)
+        EncryptedHistoryRoomTimelineView(timelineItem: item)
+    }
+}

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

@@ -119,6 +119,13 @@ class TimelineTableViewController: UIViewController {
         // for each possible cell, causing layout issues
         tableView.accessibilityElementsHidden = Tests.shouldDisableTimelineAccessibility
         
+        tableView.publisher(for: \.contentSize)
+            .removeDuplicates()
+            .sink { [weak self] _ in
+                self?.updateTopPadding()
+            }
+            .store(in: &cancellables)
+        
         scrollToBottomPublisher
             .sink { [weak self] _ in
                 self?.scrollToBottom(animated: true)
@@ -242,9 +249,11 @@ class TimelineTableViewController: UIViewController {
         snapshot.appendSections([.main])
         snapshot.appendItems(timelineItemsIDs)
         dataSource.apply(snapshot, animatingDifferences: false)
-
+        
+        // Probably redundant now we observe content size changes…
+        // Leaving in place for the release and will reassess after.
         updateTopPadding()
-
+        
         if previousLayout.isBottomVisible {
             scrollToBottom(animated: false)
         } else if let pinnedItem = previousLayout.pinnedItem {
@@ -283,7 +292,8 @@ class TimelineTableViewController: UIViewController {
         let contentHeight = tableView.contentSize.height - headerHeight
         let newHeight = max(0, tableView.visibleSize.height - contentHeight)
         
-        guard newHeight != headerHeight else { return }
+        // Round the check to account floating point accuracy during keyboard appearance.
+        guard newHeight.rounded() != headerHeight.rounded() else { return }
         
         if newHeight > 0 {
             let frame = CGRect(origin: .zero, size: CGSize(width: tableView.contentSize.width, height: newHeight))

ElementX/Sources/Services/Timeline/TimelineController/MockRoomTimelineControllerFactory.swift

@@ -17,8 +17,7 @@
 import Foundation
 
 struct MockRoomTimelineControllerFactory: RoomTimelineControllerFactoryProtocol {
-    func buildRoomTimelineController(userId: String,
+    func buildRoomTimelineController(roomProxy: RoomProxyProtocol,
-                                     roomProxy: RoomProxyProtocol,
                                      timelineItemFactory: RoomTimelineItemFactoryProtocol,
                                      mediaProvider: MediaProviderProtocol) -> RoomTimelineControllerProtocol {
         let timelineController = MockRoomTimelineController()

ElementX/Sources/Services/Timeline/TimelineController/RoomTimelineController.swift

@@ -19,7 +19,6 @@ import Foundation
 import UIKit
 
 class RoomTimelineController: RoomTimelineControllerProtocol {
-    private let userId: String
     private let roomProxy: RoomProxyProtocol
     private let timelineProvider: RoomTimelineProviderProtocol
     private let timelineItemFactory: RoomTimelineItemFactoryProtocol
@@ -42,12 +41,10 @@ class RoomTimelineController: RoomTimelineControllerProtocol {
         roomProxy.id
     }
     
-    init(userId: String,
+    init(roomProxy: RoomProxyProtocol,
-         roomProxy: RoomProxyProtocol,
          timelineItemFactory: RoomTimelineItemFactoryProtocol,
          mediaProvider: MediaProviderProtocol,
          appSettings: AppSettings) {
-        self.userId = userId
         self.roomProxy = roomProxy
         timelineProvider = roomProxy.timelineProvider
         self.timelineItemFactory = timelineItemFactory
@@ -246,6 +243,7 @@ class RoomTimelineController: RoomTimelineControllerProtocol {
         var newTimelineItems = [RoomTimelineItemProtocol]()
         var canBackPaginate = true
         var isBackPaginating = false
+        var lastEncryptedHistoryItemIndex: Int?
         
         let collapsibleChunks = timelineProvider.itemsPublisher.value.groupBy { isItemCollapsible($0) }
         
@@ -264,6 +262,8 @@ class RoomTimelineController: RoomTimelineControllerProtocol {
                     isBackPaginating = true
                 } else if timelineItem is TimelineStartRoomTimelineItem {
                     canBackPaginate = false
+                } else if timelineItem is EncryptedHistoryRoomTimelineItem {
+                    canBackPaginate = false
                 }
                 
                 return timelineItem
@@ -280,11 +280,21 @@ class RoomTimelineController: RoomTimelineControllerProtocol {
                     continue
                 }
                 
+                if timelineItem is EncryptedHistoryRoomTimelineItem {
+                    lastEncryptedHistoryItemIndex = newTimelineItems.endIndex
+                }
+                
                 newTimelineItems.append(timelineItem)
             } else {
                 newTimelineItems.append(CollapsibleTimelineItem(items: items))
             }
         }
+        
+        if let lastEncryptedHistoryItemIndex {
+            // Remove everything up to the last encrypted history item.
+            // It only contains encrypted messages, state changes and date separators.
+            newTimelineItems.removeFirst(lastEncryptedHistoryItemIndex)
+        }
 
         timelineItems = newTimelineItems
         
@@ -298,6 +308,10 @@ class RoomTimelineController: RoomTimelineControllerProtocol {
         case .event(let eventTimelineItem):
             let timelineItem = timelineItemFactory.buildTimelineItem(for: eventTimelineItem)
             
+            if timelineItem is EncryptedRoomTimelineItem, isItemInEncryptionHistory(eventTimelineItem) {
+                return EncryptedHistoryRoomTimelineItem(id: eventTimelineItem.id)
+            }
+            
             if let messageTimelineItem = timelineItem as? EventBasedMessageTimelineItemProtocol {
                 // Avoid fetching this over and over again as it changes states if it keeps failing to load
                 // Errors will be handled again on appearance
@@ -326,6 +340,13 @@ class RoomTimelineController: RoomTimelineControllerProtocol {
         }
     }
     
+    /// Whether or not a specific item is part of the room's history that can't be decrypted due
+    /// to the lack of key-backup. This is handled differently so we only show a single item.
+    private func isItemInEncryptionHistory(_ itemProxy: EventTimelineItemProxy) -> Bool {
+        guard roomProxy.isEncrypted, let lastLoginDate = appSettings.lastLoginDate else { return false }
+        return itemProxy.timestamp < lastLoginDate
+    }
+    
     private func isItemCollapsible(_ item: TimelineItemProxy) -> Bool {
         if !appSettings.shouldCollapseRoomStateEvents {
             return false

ElementX/Sources/Services/Timeline/TimelineController/RoomTimelineControllerFactory.swift

@@ -17,12 +17,10 @@
 import Foundation
 
 struct RoomTimelineControllerFactory: RoomTimelineControllerFactoryProtocol {
-    func buildRoomTimelineController(userId: String,
+    func buildRoomTimelineController(roomProxy: RoomProxyProtocol,
-                                     roomProxy: RoomProxyProtocol,
                                      timelineItemFactory: RoomTimelineItemFactoryProtocol,
                                      mediaProvider: MediaProviderProtocol) -> RoomTimelineControllerProtocol {
-        RoomTimelineController(userId: userId,
+        RoomTimelineController(roomProxy: roomProxy,
-                               roomProxy: roomProxy,
                                timelineItemFactory: timelineItemFactory,
                                mediaProvider: mediaProvider,
                                appSettings: ServiceLocator.shared.settings)

ElementX/Sources/Services/Timeline/TimelineController/RoomTimelineControllerFactoryProtocol.swift

@@ -18,8 +18,7 @@ import Foundation
 
 @MainActor
 protocol RoomTimelineControllerFactoryProtocol {
-    func buildRoomTimelineController(userId: String,
+    func buildRoomTimelineController(roomProxy: RoomProxyProtocol,
-                                     roomProxy: RoomProxyProtocol,
                                      timelineItemFactory: RoomTimelineItemFactoryProtocol,
                                      mediaProvider: MediaProviderProtocol) -> RoomTimelineControllerProtocol
 }

ElementX/Sources/Services/Timeline/TimelineItems/Items/Virtual/EncryptedHistoryRoomTimelineItem.swift

@@ -0,0 +1,21 @@
+//
+// Copyright 2023 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+struct EncryptedHistoryRoomTimelineItem: DecorationTimelineItemProtocol, Identifiable, Hashable {
+    let id: String
+}

ElementX/Sources/Services/Timeline/TimelineItems/RoomTimelineItemView.swift

@@ -55,6 +55,8 @@ struct RoomTimelineItemView: View {
             UnsupportedRoomTimelineView(timelineItem: item)
         case .timelineStart(let item):
             TimelineStartRoomTimelineView(timelineItem: item)
+        case .encryptedHistory(let item):
+            EncryptedHistoryRoomTimelineView(timelineItem: item)
         case .state(let item):
             StateRoomTimelineView(timelineItem: item)
         case .group(let item):

ElementX/Sources/Services/Timeline/TimelineItems/RoomTimelineItemViewModel.swift

@@ -58,6 +58,7 @@ enum RoomTimelineItemType: Equatable {
     case sticker(StickerRoomTimelineItem)
     case unsupported(UnsupportedRoomTimelineItem)
     case timelineStart(TimelineStartRoomTimelineItem)
+    case encryptedHistory(EncryptedHistoryRoomTimelineItem)
     case state(StateRoomTimelineItem)
     case group(CollapsibleTimelineItem)
     case location(LocationRoomTimelineItem)
@@ -95,6 +96,8 @@ enum RoomTimelineItemType: Equatable {
             self = .unsupported(item)
         case let item as TimelineStartRoomTimelineItem:
             self = .timelineStart(item)
+        case let item as EncryptedHistoryRoomTimelineItem:
+            self = .encryptedHistory(item)
         case let item as StateRoomTimelineItem:
             self = .state(item)
         case let item as CollapsibleTimelineItem:
@@ -123,6 +126,7 @@ enum RoomTimelineItemType: Equatable {
              .sticker(let item as RoomTimelineItemProtocol),
              .unsupported(let item as RoomTimelineItemProtocol),
              .timelineStart(let item as RoomTimelineItemProtocol),
+             .encryptedHistory(let item as RoomTimelineItemProtocol),
              .state(let item as RoomTimelineItemProtocol),
              .group(let item as RoomTimelineItemProtocol),
              .location(let item as RoomTimelineItemProtocol):
@@ -137,7 +141,7 @@ enum RoomTimelineItemType: Equatable {
             return true
         case .redacted, .encrypted, .unsupported, .state: // Event based items that aren't reactable
             return false
-        case .timelineStart, .separator, .readMarker, .paginationIndicator: // Virtual items are never reactable
+        case .timelineStart, .encryptedHistory, .separator, .readMarker, .paginationIndicator: // Virtual items are never reactable
             return false
         case .group:
             return false

changelog.d/1251.change

@@ -0,0 +1 @@
+Add encryption history banner.