vector-im/element-x-ios/issues/31 - Implement simple SaS sesson verification

* vector-im/element-x-ios/issues/31 - Session verification unit and UI tests
* Fix ImageAnonymizer tests when running on Apple Silicon
* Rename SessionVerification to SessionVerificationScreen

ElementX.xcodeproj/project.pbxproj

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@@ -454,6 +468,7 @@
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+		9873076F224E4CE09D8BD47D /* TemplateScreenUITests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemplateScreenUITests.swift; sourceTree = "<group>"; };
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@@ -528,7 +545,7 @@
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-		A1C29670CEC77346F31EE94C /* TemplateModels.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemplateModels.swift; sourceTree = "<group>"; };
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@@ -597,6 +617,7 @@
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@@ -604,6 +625,7 @@
 		CF4B39D52CAE7D21D276ABEE /* ElementNavigationController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ElementNavigationController.swift; sourceTree = "<group>"; };
 		CF847B3C1873B8E81CEE7FAC /* SplashScreenViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SplashScreenViewModel.swift; sourceTree = "<group>"; };
 		D0A45283CF1DB96E583BECA6 /* ImageRoomTimelineView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ImageRoomTimelineView.swift; sourceTree = "<group>"; };
+		D1A9CCCF53495CF3D7B19FCE /* MockSessionVerificationControllerProxy.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MockSessionVerificationControllerProxy.swift; sourceTree = "<group>"; };
 		D29EBCBFEC6FD0941749404D /* NavigationRouterStore.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NavigationRouterStore.swift; sourceTree = "<group>"; };
 		D31DC8105C6233E5FFD9B84C /* element-x-ios */ = {isa = PBXFileReference; lastKnownFileType = folder; name = "element-x-ios"; path = .; sourceTree = SOURCE_ROOT; };
 		D4DA544B2520BFA65D6DB4BB /* target.yml */ = {isa = PBXFileReference; lastKnownFileType = text.yaml; path = target.yml; sourceTree = "<group>"; };
@@ -612,18 +634,20 @@
 		D6CA5F386C7701C129398945 /* AuthenticationCoordinator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AuthenticationCoordinator.swift; sourceTree = "<group>"; };
 		D6D094C15E8DB424F1C6FC94 /* hr */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = hr; path = hr.lproj/Localizable.strings; sourceTree = "<group>"; };
 		D6DC38E64A5ED3FDB201029A /* BugReportService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BugReportService.swift; sourceTree = "<group>"; };
+		DBD460ED7ED1E03B85DEA25C /* TemplateCoordinator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemplateCoordinator.swift; sourceTree = "<group>"; };
 		DBFEAC3AC691CBB84983E275 /* ElementXTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ElementXTests.swift; sourceTree = "<group>"; };
 		DCE978A6118C131D7F2A04B3 /* SplashScreenModels.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SplashScreenModels.swift; sourceTree = "<group>"; };
 		DD667C4BB98CF4F3FE2CE3B0 /* LoginCoordinator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LoginCoordinator.swift; sourceTree = "<group>"; };
 		DD73FAAA4A76CE4A1F3014D9 /* UserIndicator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UserIndicator.swift; sourceTree = "<group>"; };
 		DED59F9EFF273BFA2055FFDF /* BugReportScreen.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BugReportScreen.swift; sourceTree = "<group>"; };
+		DF05DA24F71B455E8EFEBC3B /* SessionVerificationViewModelTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SessionVerificationViewModelTests.swift; sourceTree = "<group>"; };
 		E077F76026C85ED96FEBB810 /* UserIndicatorPresenter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UserIndicatorPresenter.swift; sourceTree = "<group>"; };
 		E0FCA0957FAA0E15A9F5579D /* en */ = {isa = PBXFileReference; lastKnownFileType = text.plist.stringsdict; name = en; path = en.lproj/Untranslated.stringsdict; sourceTree = "<group>"; };
 		E157152B11E347F735C3FD6E /* tr */ = {isa = PBXFileReference; lastKnownFileType = text.plist.stringsdict; name = tr; path = tr.lproj/Localizable.stringsdict; sourceTree = "<group>"; };
 		E18CF12478983A5EB390FB26 /* MessageComposer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MessageComposer.swift; sourceTree = "<group>"; };
-		E2869CFFF6CD2A642AB4B743 /* TemplateCoordinator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemplateCoordinator.swift; sourceTree = "<group>"; };
 		E3E29F98CF0E960689A410E3 /* SettingsUITests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingsUITests.swift; sourceTree = "<group>"; };
 		E45C57120F28F8D619150219 /* sr */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = sr; path = sr.lproj/Localizable.strings; sourceTree = "<group>"; };
+		E4BB9A17AC512A7EF4B106E5 /* SessionVerificationModels.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SessionVerificationModels.swift; sourceTree = "<group>"; };
 		E5272BC4A60B6AD7553BACA1 /* BlurHashDecode.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BlurHashDecode.swift; sourceTree = "<group>"; };
 		E579A0DA01F488C97B771EF6 /* lv */ = {isa = PBXFileReference; lastKnownFileType = text.plist.stringsdict; name = lv; path = lv.lproj/Localizable.stringsdict; sourceTree = "<group>"; };
 		E5D2C0950F8196232D88045C /* ServerSelectionScreen.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ServerSelectionScreen.swift; sourceTree = "<group>"; };
@@ -634,6 +658,7 @@
 		EBE5502760CF6CA2D7201883 /* ja */ = {isa = PBXFileReference; lastKnownFileType = text.plist.stringsdict; name = ja; path = ja.lproj/Localizable.stringsdict; sourceTree = "<group>"; };
 		ED1D792EB82506A19A72C8DE /* RoomTimelineItemProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RoomTimelineItemProtocol.swift; sourceTree = "<group>"; };
 		EDAA4472821985BF868CC21C /* ServerSelectionViewModelTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ServerSelectionViewModelTests.swift; sourceTree = "<group>"; };
+		EDB6E40BAD4504D899FAAC9A /* TemplateViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemplateViewModel.swift; sourceTree = "<group>"; };
 		EE8BCD14EFED23459A43FDFF /* ja */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = ja; path = ja.lproj/Localizable.strings; sourceTree = "<group>"; };
 		EEE384418EB1FEDFA62C9CD0 /* RoomTimelineViewFactoryProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RoomTimelineViewFactoryProtocol.swift; sourceTree = "<group>"; };
 		EF188681D6B6068CFAEAFC3F /* MXLogger.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MXLogger.m; sourceTree = "<group>"; };
@@ -651,12 +676,11 @@
 		F73FF1A33198F5FAE9D34B1F /* FormattedBodyText.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FormattedBodyText.swift; sourceTree = "<group>"; };
 		F77C060C2ACC4CB7336A29E7 /* EmoteRoomTimelineItem.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EmoteRoomTimelineItem.swift; sourceTree = "<group>"; };
 		F7B81C8227BBEA95CCE86037 /* MatrixEntitityRegex.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MatrixEntitityRegex.swift; sourceTree = "<group>"; };
-		F9BA045DC4CA12D030ACF558 /* TemplateScreen.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemplateScreen.swift; sourceTree = "<group>"; };
 		F9E785D5137510481733A3E8 /* TextRoomTimelineView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TextRoomTimelineView.swift; sourceTree = "<group>"; };
 		FA154570F693D93513E584C1 /* RoomMessageFactory.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RoomMessageFactory.swift; sourceTree = "<group>"; };
+		FAB10E673916D2B8D21FD197 /* TemplateModels.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemplateModels.swift; sourceTree = "<group>"; };
 		FDB9C37196A4C79F24CE80C6 /* KeychainControllerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = KeychainControllerTests.swift; sourceTree = "<group>"; };
 		FE2DF459F1737A594667CC46 /* EmoteRoomMessage.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EmoteRoomMessage.swift; sourceTree = "<group>"; };
-		FF4EDB32B97910AAAFE632B2 /* TemplateViewModelProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemplateViewModelProtocol.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -735,6 +759,7 @@
 				79E560F5113ED25D172E550C /* Media */,
 				40E6246F03D1FE377BC5D963 /* Room */,
 				82D5AD3EAE3A5C1068A44A88 /* Session */,
+				5329E48968EB951235E83DAE /* SessionVerification */,
 				FCDF06BDB123505F0334B4F9 /* Timeline */,
 				90C85A862720155C0CF63B02 /* UserSessionStore */,
 			);
@@ -753,6 +778,14 @@
 			path = SupportingFiles;
 			sourceTree = "<group>";
 		};
+		0BA8C419737BDA72B553B129 /* View */ = {
+			isa = PBXGroup;
+			children = (
+				8AC1A01C3A745BDF1D3697D3 /* SessionVerificationScreen.swift */,
+			);
+			path = View;
+			sourceTree = "<group>";
+		};
 		0ED3F5C21537519389C07644 /* BugReport */ = {
 			isa = PBXGroup;
 			children = (
@@ -915,7 +948,7 @@
 		4AC3BA2B379A928301E21004 /* View */ = {
 			isa = PBXGroup;
 			children = (
-				F9BA045DC4CA12D030ACF558 /* TemplateScreen.swift */,
+				4549FCB53F43DB0B278374BC /* TemplateScreen.swift */,
 			);
 			path = View;
 			sourceTree = "<group>";
@@ -945,6 +978,16 @@
 			path = Scripts;
 			sourceTree = "<group>";
 		};
+		5329E48968EB951235E83DAE /* SessionVerification */ = {
+			isa = PBXGroup;
+			children = (
+				D1A9CCCF53495CF3D7B19FCE /* MockSessionVerificationControllerProxy.swift */,
+				C55D7E514F9DE4E3D72FDCAD /* SessionVerificationControllerProxy.swift */,
+				1D56469A9EE0CFA2B7BA9760 /* SessionVerificationControllerProxyProtocol.swift */,
+			);
+			path = SessionVerification;
+			sourceTree = "<group>";
+		};
 		58F951CB7BD7F96C37BE5CAD /* View */ = {
 			isa = PBXGroup;
 			children = (
@@ -1020,7 +1063,7 @@
 		73AB116809AE89292624CD8E /* Unit */ = {
 			isa = PBXGroup;
 			children = (
-				C08E9043618AE5B0BF7B07E1 /* TemplateViewModelTests.swift */,
+				3340ABAE3A4647E80163AE18 /* TemplateViewModelTests.swift */,
 			);
 			path = Unit;
 			sourceTree = "<group>";
@@ -1042,6 +1085,8 @@
 				93CF7B19FFCF8EFBE0A8696A /* RoomScreenViewModelTests.swift */,
 				F03C9D319676F3C0DC6B0203 /* ScreenshotDetectorTests.swift */,
 				EDAA4472821985BF868CC21C /* ServerSelectionViewModelTests.swift */,
+				A1C22B1B5FA3A765EADB2CC9 /* SessionVerificationStateMachineTests.swift */,
+				DF05DA24F71B455E8EFEBC3B /* SessionVerificationViewModelTests.swift */,
 				3D487C1185D658F8B15B8F55 /* SettingsViewModelTests.swift */,
 				7B5CF94E124616FD89424B73 /* SplashScreenViewModelTests.swift */,
 				AF552BB969DC98A4BB8CF8D5 /* UserIndicators */,
@@ -1073,10 +1118,10 @@
 		789DD6B31BA8BB4B3A40EF7C /* ElementX */ = {
 			isa = PBXGroup;
 			children = (
-				E2869CFFF6CD2A642AB4B743 /* TemplateCoordinator.swift */,
+				DBD460ED7ED1E03B85DEA25C /* TemplateCoordinator.swift */,
-				A1C29670CEC77346F31EE94C /* TemplateModels.swift */,
+				FAB10E673916D2B8D21FD197 /* TemplateModels.swift */,
-				47543EB19F3DCF308751F53C /* TemplateViewModel.swift */,
+				EDB6E40BAD4504D899FAAC9A /* TemplateViewModel.swift */,
-				FF4EDB32B97910AAAFE632B2 /* TemplateViewModelProtocol.swift */,
+				2B80895CE021B49847BD7D74 /* TemplateViewModelProtocol.swift */,
 				4AC3BA2B379A928301E21004 /* View */,
 			);
 			path = ElementX;
@@ -1191,6 +1236,7 @@
 				4D6E4C37E9F0E53D3DF951AC /* HomeScreenUITests.swift */,
 				1DB34B0C74CD242FED9DD069 /* LoginScreenUITests.swift */,
 				086B997409328F091EBA43CE /* RoomScreenUITests.swift */,
+				6D4777F0142E330A75C46FE4 /* SessionVerificationUITests.swift */,
 				E3E29F98CF0E960689A410E3 /* SettingsUITests.swift */,
 				325A2B3278875554DDEB8A9B /* SplashScreenUITests.swift */,
 			);
@@ -1296,7 +1342,7 @@
 		AD5FCF9340D670C526AD17E4 /* UI */ = {
 			isa = PBXGroup;
 			children = (
-				4B66E05B6009B0EB1BDBFA6E /* TemplateScreenUITests.swift */,
+				9873076F224E4CE09D8BD47D /* TemplateScreenUITests.swift */,
 			);
 			path = UI;
 			sourceTree = "<group>";
@@ -1389,6 +1435,19 @@
 			path = Layout;
 			sourceTree = "<group>";
 		};
+		D958761758AA1110476DE6A3 /* SessionVerification */ = {
+			isa = PBXGroup;
+			children = (
+				CCF86010A0A719A9A50EEC59 /* SessionVerificationCoordinator.swift */,
+				E4BB9A17AC512A7EF4B106E5 /* SessionVerificationModels.swift */,
+				C06FCD42EEFEFC220F14EAC5 /* SessionVerificationStateMachine.swift */,
+				B4C18FAAD59AE7F1462D817E /* SessionVerificationViewModel.swift */,
+				B3069ADED46D063202FE7698 /* SessionVerificationViewModelProtocol.swift */,
+				0BA8C419737BDA72B553B129 /* View */,
+			);
+			path = SessionVerification;
+			sourceTree = "<group>";
+		};
 		E59565F441830B19DBAE567C /* Screens */ = {
 			isa = PBXGroup;
 			children = (
@@ -1396,6 +1455,7 @@
 				4009BE2E791C16AC6EE39A7E /* BugReport */,
 				B53CA9BECD3F97805E1432D0 /* HomeScreen */,
 				679E9837ECA8D6776079D16E /* RoomScreen */,
+				D958761758AA1110476DE6A3 /* SessionVerification */,
 				70B74A432C241E56A7ACE610 /* Settings */,
 				02175C9269C4632DB6D12C25 /* Splash */,
 				B1A847595434E3DD177F5143 /* SplashScreen */,
@@ -1604,7 +1664,7 @@
 				};
 			};
 			buildConfigurationList = 7AE41FCCF9D1352E2770D1F9 /* Build configuration list for PBXProject "ElementX" */;
-			compatibilityVersion = "Xcode 11.0";
+			compatibilityVersion = "Xcode 10.0";
 			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
@@ -1808,9 +1868,11 @@
 				46562110EE202E580A5FFD9C /* RoomScreenViewModelTests.swift in Sources */,
 				EA31DD9043B91ECB8E45A9A6 /* ScreenshotDetectorTests.swift in Sources */,
 				93875ADD456142D20823ED24 /* ServerSelectionViewModelTests.swift in Sources */,
+				86675910612A12409262DFBD /* SessionVerificationStateMachineTests.swift in Sources */,
+				755727E0B756430DFFEC4732 /* SessionVerificationViewModelTests.swift in Sources */,
 				206F0DBAB6AF042CA1FF2C0D /* SettingsViewModelTests.swift in Sources */,
 				94E062D08E27B0387658E364 /* SplashScreenViewModelTests.swift in Sources */,
-				E75CE800B3E64D0F7F8E228D /* TemplateViewModelTests.swift in Sources */,
+				7AE1FFB132F2B84EB8A2AEBC /* TemplateViewModelTests.swift in Sources */,
 				226027BE23AF64FA61C7A4C0 /* TimelineStyle.swift in Sources */,
 				1151DCC5EC2C6585826545EC /* UserIndicatorPresenterSpy.swift in Sources */,
 				4B8A2C45FF906ADBB1F5C3B4 /* UserIndicatorQueueTests.swift in Sources */,
@@ -1907,6 +1969,7 @@
 				29AEE68A604940180AB9EBFF /* MockRoomSummary.swift in Sources */,
 				E81EEC1675F2371D12A880A3 /* MockRoomTimelineController.swift in Sources */,
 				9BE7A9CF6C593251D734B461 /* MockServerSelectionScreenState.swift in Sources */,
+				D034A195A3494E38BF060485 /* MockSessionVerificationControllerProxy.swift in Sources */,
 				4ED453A61AF45EBE18D8BC69 /* NavigationModule.swift in Sources */,
 				22DADD537401E79D66132134 /* NavigationRouter.swift in Sources */,
 				12F70C493FB69F4D7E9A37EA /* NavigationRouterStore.swift in Sources */,
@@ -1953,6 +2016,14 @@
 				388FD50AC66E9E684DDFA9D8 /* ServerSelectionScreen.swift in Sources */,
 				BB01CC19C3D3322308D1B2CF /* ServerSelectionViewModel.swift in Sources */,
 				19839F3526CE8C35AAF241AD /* ServerSelectionViewModelProtocol.swift in Sources */,
+				237FC70AA257B935F53316BA /* SessionVerificationControllerProxy.swift in Sources */,
+				94A65DD8A353DF112EBEF67A /* SessionVerificationControllerProxyProtocol.swift in Sources */,
+				E5895C74615CBE8462FB840F /* SessionVerificationCoordinator.swift in Sources */,
+				0C38C3E771B472E27295339D /* SessionVerificationModels.swift in Sources */,
+				BB6B0B91CE11E06330017000 /* SessionVerificationScreen.swift in Sources */,
+				9E8AE387FD03E4F1C1B8815A /* SessionVerificationStateMachine.swift in Sources */,
+				A8EC7C9D886244DAE9433E37 /* SessionVerificationViewModel.swift in Sources */,
+				D6417E5A799C3C7F14F9EC0A /* SessionVerificationViewModelProtocol.swift in Sources */,
 				34966D4C1C2C6D37FE3F7F50 /* SettingsCoordinator.swift in Sources */,
 				3B770CB4DED51CC362C66D47 /* SettingsModels.swift in Sources */,
 				7FED310F6AB7A70CBFB7C8A3 /* SettingsScreen.swift in Sources */,
@@ -1970,11 +2041,11 @@
 				2F94054F50E312AF30BE07F3 /* String.swift in Sources */,
 				A7D48E44D485B143AADDB77D /* Strings+Untranslated.swift in Sources */,
 				066A1E9B94723EE9F3038044 /* Strings.swift in Sources */,
-				5CABC57F620FBB39F4EC127C /* TemplateScreen.swift in Sources */,
+				43FD77998F33C32718C51450 /* TemplateCoordinator.swift in Sources */,
-				C1156BBE4F977AEEE1E80C48 /* TemplateCoordinator.swift in Sources */,
+				63C9AF0FB8278AF1C0388A0C /* TemplateModels.swift in Sources */,
-				B0EDAF55877DE19B67837C22 /* TemplateModels.swift in Sources */,
+				1555A7643D85187D4851040C /* TemplateScreen.swift in Sources */,
-				ED4F663C783E9A8C0E80B983 /* TemplateViewModel.swift in Sources */,
+				75EA4ABBFAA810AFF289D6F4 /* TemplateViewModel.swift in Sources */,
-				3772354754450F2B54107E17 /* TemplateViewModelProtocol.swift in Sources */,
+				5F1FDE49DFD0C680386E48F9 /* TemplateViewModelProtocol.swift in Sources */,
 				D013E70C8E28E43497820444 /* TextRoomMessage.swift in Sources */,
 				7963F98CDFDEAC75E072BD81 /* TextRoomTimelineItem.swift in Sources */,
 				5E0F2E612718BB4397A6D40A /* TextRoomTimelineView.swift in Sources */,
@@ -2026,11 +2097,12 @@
 				9DC5FB22B8F86C3B51E907C1 /* HomeScreenUITests.swift in Sources */,
 				5C8AFBF168A41E20835F3B86 /* LoginScreenUITests.swift in Sources */,
 				2F1CF90A3460C153154427F0 /* RoomScreenUITests.swift in Sources */,
+				05EC896A4B9AF4A56670C0BB /* SessionVerificationUITests.swift in Sources */,
 				490E606044B18985055FF690 /* SettingsUITests.swift in Sources */,
 				A00DFC1DD3567B1EDC9F8D16 /* SplashScreenUITests.swift in Sources */,
 				DD9B70DE54B24E0694A35D8A /* Strings+Untranslated.swift in Sources */,
 				B3357B00F1AA930E54F76609 /* Strings.swift in Sources */,
-				2E68C57E7D644E94778743D5 /* TemplateScreenUITests.swift in Sources */,
+				C4180F418235DAD9DD173951 /* TemplateScreenUITests.swift in Sources */,
 				0ED951768EC443A8728DE1D7 /* TimelineStyle.swift in Sources */,
 				75D98001C5AC38B6A5CA897C /* UITestScreenIdentifier.swift in Sources */,
 			);

ElementX/Sources/AppCoordinator.swift

@@ -7,11 +7,12 @@
 //
 
 import UIKit
+import Combine
 
 class AppCoordinator: AuthenticationCoordinatorDelegate, Coordinator {
     private let window: UIWindow
     
-    private var stateMachine: AppCoordinatorStateMachine
+    private let stateMachine: AppCoordinatorStateMachine
     
     private let mainNavigationController: UINavigationController
     private let splashViewController: UIViewController
@@ -142,10 +143,17 @@ class AppCoordinator: AuthenticationCoordinatorDelegate, Coordinator {
                 self.tearDownUserSession()
             case (.signingOut, .failedSigningOut, _):
                 self.showLogoutErrorToast()
+            
             case (.homeScreen, .showSettingsScreen, .settingsScreen):
                 self.presentSettingsScreen()
             case (.settingsScreen, .dismissedSettingsScreen, .homeScreen):
                 self.tearDownDismissedSettingsScreen()
+                
+            case (.homeScreen, .showSessionVerificationScreen, .sessionVerificationScreen):
+                self.presentSessionVerification()
+            case (.sessionVerificationScreen, .dismissedSessionVerificationScreen, .homeScreen):
+                self.tearDownDismissedSessionVerificationScreen()
+                
             default:
                 fatalError("Unknown transition: \(context)")
             }
@@ -205,6 +213,8 @@ class AppCoordinator: AuthenticationCoordinatorDelegate, Coordinator {
                 self.stateMachine.processEvent(.showRoomScreen(roomId: roomIdentifier))
             case .presentSettings:
                 self.stateMachine.processEvent(.showSettingsScreen)
+            case .verifySession:
+                self.stateMachine.processEvent(.showSessionVerificationScreen)
             }
         }
         
@@ -216,26 +226,7 @@ class AppCoordinator: AuthenticationCoordinatorDelegate, Coordinator {
         }
     }
     
-    private func presentSettingsScreen() {
+    // MARK: Rooms
-        let parameters = SettingsCoordinatorParameters(navigationRouter: navigationRouter,
-                                                       bugReportService: bugReportService)
-        let coordinator = SettingsCoordinator(parameters: parameters)
-        coordinator.callback = { [weak self] action in
-            guard let self = self else { return }
-            switch action {
-            case .logout:
-                self.stateMachine.processEvent(.attemptSignOut)
-            }
-        }
-
-        add(childCoordinator: coordinator)
-        coordinator.start()
-        navigationRouter.push(coordinator) { [weak self] in
-            guard let self = self else { return }
-
-            self.stateMachine.processEvent(.dismissedSettingsScreen)
-        }
-    }
 
     private func presentRoomWithIdentifier(_ roomIdentifier: String) {
         guard let roomProxy = userSession.clientProxy.rooms.first(where: { $0.id == roomIdentifier }) else {
@@ -277,6 +268,29 @@ class AppCoordinator: AuthenticationCoordinatorDelegate, Coordinator {
         remove(childCoordinator: coordinator)
     }
     
+    // MARK: Settings
+    
+    private func presentSettingsScreen() {
+        let parameters = SettingsCoordinatorParameters(navigationRouter: navigationRouter,
+                                                       bugReportService: bugReportService)
+        let coordinator = SettingsCoordinator(parameters: parameters)
+        coordinator.callback = { [weak self] action in
+            guard let self = self else { return }
+            switch action {
+            case .logout:
+                self.stateMachine.processEvent(.attemptSignOut)
+            }
+        }
+
+        add(childCoordinator: coordinator)
+        coordinator.start()
+        navigationRouter.push(coordinator) { [weak self] in
+            guard let self = self else { return }
+
+            self.stateMachine.processEvent(.dismissedSettingsScreen)
+        }
+    }
+        
     private func tearDownDismissedSettingsScreen() {
         guard let coordinator = childCoordinators.last as? SettingsCoordinator else {
             fatalError("Invalid coordinator hierarchy: \(childCoordinators)")
@@ -285,22 +299,6 @@ class AppCoordinator: AuthenticationCoordinatorDelegate, Coordinator {
         remove(childCoordinator: coordinator)
     }
     
-    private func showLoadingIndicator() {
-        loadingIndicator = indicatorPresenter.present(.loading(label: ElementL10n.loading, isInteractionBlocking: true))
-    }
-    
-    private func hideLoadingIndicator() {
-        loadingIndicator = nil
-    }
-    
-    private func showLoginErrorToast() {
-        statusIndicator = indicatorPresenter.present(.error(label: "Failed logging in"))
-    }
-    
-    private func showLogoutErrorToast() {
-        statusIndicator = indicatorPresenter.present(.error(label: "Failed logging out"))
-    }
-
     private func showCrashPopup() {
         let alert = UIAlertController(title: nil,
                                       message: ElementL10n.sendBugReportAppCrashed,
@@ -360,4 +358,54 @@ class AppCoordinator: AuthenticationCoordinatorDelegate, Coordinator {
         navigationRouter.dismissModule()
         remove(childCoordinator: bugReportCoordinator)
     }
+    
+    // MARK: Session verification
+        
+    private func presentSessionVerification() {
+        Task {
+            guard let sessionVerificationController = userSession.sessionVerificationController else {
+                fatalError("The sessionVerificationController should aways be valid at this point")
+            }
+            
+            let parameters = SessionVerificationCoordinatorParameters(sessionVerificationControllerProxy: sessionVerificationController)
+            
+            let coordinator = SessionVerificationCoordinator(parameters: parameters)
+            
+            coordinator.callback = { [weak self] in
+                self?.navigationRouter.dismissModule()
+                self?.stateMachine.processEvent(.dismissedSessionVerificationScreen)
+            }
+            
+            add(childCoordinator: coordinator)
+            navigationRouter.present(coordinator)
+
+            coordinator.start()
+        }
+    }
+    
+    private func tearDownDismissedSessionVerificationScreen() {
+        guard let coordinator = childCoordinators.last as? SessionVerificationCoordinator else {
+            fatalError("Invalid coordinator hierarchy: \(childCoordinators)")
+        }
+
+        remove(childCoordinator: coordinator)
+    }
+    
+    // MARK: Toasts and loading indicators
+    
+    private func showLoadingIndicator() {
+        loadingIndicator = indicatorPresenter.present(.loading(label: ElementL10n.loading, isInteractionBlocking: true))
+    }
+    
+    private func hideLoadingIndicator() {
+        loadingIndicator = nil
+    }
+    
+    private func showLoginErrorToast() {
+        statusIndicator = indicatorPresenter.present(.error(label: "Failed logging in"))
+    }
+    
+    private func showLogoutErrorToast() {
+        statusIndicator = indicatorPresenter.present(.error(label: "Failed logging out"))
+    }
 }

ElementX/Sources/AppCoordinatorStateMachine.swift

@@ -22,11 +22,17 @@ class AppCoordinatorStateMachine {
         case restoringSession
         /// Showing the home screen
         case homeScreen
-        /// Showing the settings screen
+        
-        case settingsScreen
         /// Showing a particular room's timeline
         /// - Parameter roomId: that room's identifier
         case roomScreen(roomId: String)
+        
+        /// Showing the session verification flows
+        case sessionVerificationScreen
+    
+        /// Showing the settings screen
+        case settingsScreen
+        
         /// Processing a sign out request
         case signingOut
     }
@@ -61,10 +67,16 @@ class AppCoordinatorStateMachine {
         case showRoomScreen(roomId: String)
         /// The room screen has been dismissed
         case dismissedRoomScreen
-        /// The settings screen has been dismissed
+        
-        case dismissedSettingsScreen
+        /// Request the start of the session verification flow
+        case showSessionVerificationScreen
+        /// Session verification has finished
+        case dismissedSessionVerificationScreen
+        
         /// Request settings screen presentation
         case showSettingsScreen
+        /// The settings screen has been dismissed
+        case dismissedSettingsScreen
     }
     
     private let stateMachine: StateMachine<State, Event>
@@ -84,9 +96,13 @@ class AppCoordinatorStateMachine {
             
             machine.addRoutes(event: .succeededSigningOut, transitions: [ .signingOut => .signedOut ])
             machine.addRoutes(event: .failedSigningOut, transitions: [ .signingOut => .settingsScreen ])
+
             machine.addRoutes(event: .showSettingsScreen, transitions: [ .homeScreen => .settingsScreen ])
             machine.addRoutes(event: .dismissedSettingsScreen, transitions: [ .settingsScreen => .homeScreen ])
             
+            machine.addRoutes(event: .showSessionVerificationScreen, transitions: [ .homeScreen => .sessionVerificationScreen ])
+            machine.addRoutes(event: .dismissedSessionVerificationScreen, transitions: [ .sessionVerificationScreen => .homeScreen ])
+            
             // Transitions with associated values need to be handled through `addRouteMapping`
             machine.addRouteMapping { event, fromState, _ in
                 switch (event, fromState) {

ElementX/Sources/Other/ImageAnonymizer.swift

@@ -62,6 +62,12 @@ struct ImageAnonymizer {
         // revision3 doesn't work!
         faceRequest.revision = VNDetectFaceRectanglesRequestRevision2
         
+        #if targetEnvironment(simulator)
+        // Avoid `Could not create inference context` errors on Apple Silicon
+        // https://www.caseyliss.com/2022/6/20/feedback-is-broken-stop-trying-to-make-radar-happen
+        faceRequest.usesCPUOnly = true
+        #endif
+
         //  perform requests
         try handler.perform([
             textRequest,

ElementX/Sources/Screens/HomeScreen/HomeScreenCoordinator.swift

@@ -26,6 +26,7 @@ struct HomeScreenCoordinatorParameters {
 enum HomeScreenCoordinatorAction {
     case presentRoom(roomIdentifier: String)
     case presentSettings
+    case verifySession
 }
 
 final class HomeScreenCoordinator: Coordinator, Presentable {
@@ -66,19 +67,31 @@ final class HomeScreenCoordinator: Coordinator, Presentable {
                 self.callback?(.presentRoom(roomIdentifier: roomIdentifier))
             case .tapUserAvatar:
                 self.callback?(.presentSettings)
+            case .verifySession:
+                self.callback?(.verifySession)
             }
         }
         
         parameters.userSession.clientProxy
             .callbacks
             .receive(on: DispatchQueue.main)
-            .sink { [weak self] action in
+            .sink { [weak self] callback in
-                switch action {
+                if case .updatedRoomsList = callback {
-                case .updatedRoomsList:
                     self?.updateRoomsList()
                 }
             }.store(in: &cancellables)
         
+        parameters.userSession.callbacks
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] callback in
+                switch callback {
+                case .sessionVerificationNeeded:
+                    self?.viewModel.showSessionVerificationBanner()
+                case .didVerifySession:
+                    self?.viewModel.hideSessionVerificationBanner()
+                }
+            }.store(in: &cancellables)
+        
         updateRoomsList()
         
         Task {

ElementX/Sources/Screens/HomeScreen/HomeScreenModels.swift

@@ -20,18 +20,22 @@ import UIKit
 enum HomeScreenViewModelAction {
     case selectRoom(roomIdentifier: String)
     case tapUserAvatar
+    case verifySession
 }
 
 enum HomeScreenViewAction {
     case loadRoomData(roomIdentifier: String)
     case selectRoom(roomIdentifier: String)
     case tapUserAvatar
+    case verifySession
 }
 
 struct HomeScreenViewState: BindableState {
     var userDisplayName: String?
     var userAvatar: UIImage?
     
+    var showSessionVerificationBanner: Bool = false
+    
     var rooms: [HomeScreenRoom] = []
     
     var isLoadingRooms: Bool = false

ElementX/Sources/Screens/HomeScreen/HomeScreenViewModel.swift

@@ -27,7 +27,7 @@ class HomeScreenViewModel: HomeScreenViewModelType, HomeScreenViewModelProtocol
 
     private var roomSummaries: [RoomSummaryProtocol]? {
         didSet {
-            self.state.isLoadingRooms = (roomSummaries?.count ?? 0 == 0)
+            state.isLoadingRooms = (roomSummaries?.count ?? 0 == 0)
         }
     }
     
@@ -51,6 +51,8 @@ class HomeScreenViewModel: HomeScreenViewModelType, HomeScreenViewModelProtocol
             callback?(.selectRoom(roomIdentifier: roomIdentifier))
         case .tapUserAvatar:
             callback?(.tapUserAvatar)
+        case .verifySession:
+            callback?(.verifySession)
         }
     }
     
@@ -84,11 +86,19 @@ class HomeScreenViewModel: HomeScreenViewModelType, HomeScreenViewModelProtocol
     }
     
     func updateWithUserAvatar(_ avatar: UIImage) {
-        self.state.userAvatar = avatar
+        state.userAvatar = avatar
     }
     
     func updateWithUserDisplayName(_ displayName: String) {
-        self.state.userDisplayName = displayName
+        state.userDisplayName = displayName
+    }
+    
+    func showSessionVerificationBanner() {
+        state.showSessionVerificationBanner = true
+    }
+    
+    func hideSessionVerificationBanner() {
+        state.showSessionVerificationBanner = false
     }
     
     // MARK: - Private
@@ -105,7 +115,7 @@ class HomeScreenViewModel: HomeScreenViewModelType, HomeScreenViewModelProtocol
     private func buildOrUpdateRoomFromSummary(_ roomSummary: RoomSummaryProtocol) -> HomeScreenRoom {
         let lastMessage = lastMessageFromEventBrief(roomSummary.lastMessage)
         
-        guard var room = self.state.rooms.first(where: { $0.id == roomSummary.id }) else {
+        guard var room = state.rooms.first(where: { $0.id == roomSummary.id }) else {
             return HomeScreenRoom(id: roomSummary.id,
                                   displayName: roomSummary.displayName,
                                   topic: roomSummary.topic,

ElementX/Sources/Screens/HomeScreen/HomeScreenViewModelProtocol.swift

@@ -26,4 +26,7 @@ protocol HomeScreenViewModelProtocol {
     func updateWithUserAvatar(_ avatar: UIImage)
     func updateWithUserDisplayName(_ displayName: String)
     func updateWithRoomSummaries(_ roomSummaries: [RoomSummaryProtocol])
+    
+    func showSessionVerificationBanner()
+    func hideSessionVerificationBanner()
 }

ElementX/Sources/Screens/HomeScreen/View/HomeScreen.swift

@@ -23,13 +23,27 @@ struct HomeScreen: View {
     // MARK: Views
     
     var body: some View {
-        VStack(spacing: 16.0) {
+        VStack(spacing: 0.0) {
             if context.viewState.isLoadingRooms {
                 VStack {
                     Text(ElementL10n.loading)
                     ProgressView()
                 }
             } else {
+                
+                if context.viewState.showSessionVerificationBanner {
+                    HStack {
+                        Text(ElementL10n.verificationVerifyDevice)
+                        Spacer()
+                        Button(ElementL10n.startVerification) {
+                            context.send(viewAction: .verifySession)
+                        }
+                    }
+                    .padding()
+                    .background(Color.element.quaternaryContent)
+                    .padding(.top, 1)
+                }
+                
                 List {
                     Section(ElementL10n.rooms) {
                         ForEach(context.viewState.visibleRooms) { room in
@@ -52,6 +66,8 @@ struct HomeScreen: View {
             Spacer()
         }
         .background(Color.element.background)
+        .transition(.slide)
+        .animation(.default, value: context.viewState.showSessionVerificationBanner)
         .ignoresSafeArea(.all, edges: .bottom)
         .navigationBarTitleDisplayMode(.inline)
         .toolbar {
@@ -100,6 +116,8 @@ struct HomeScreen: View {
 
 struct RoomCell: View {
     
+    @ScaledMetric private var avatarSize = 32.0
+    
     let room: HomeScreenRoom
     let context: HomeScreenViewModel.Context
     
@@ -112,12 +130,12 @@ struct RoomCell: View {
                     Image(uiImage: avatar)
                         .resizable()
                         .scaledToFill()
-                        .frame(width: 40, height: 40)
+                        .frame(width: avatarSize, height: avatarSize)
                         .clipShape(Circle())
                 } else {
                     PlaceholderAvatarImage(text: room.displayName ?? room.id)
                         .clipShape(Circle())
-                        .frame(width: 40, height: 40)
+                        .frame(width: avatarSize, height: avatarSize)
                 }
                 
                 VStack(alignment: .leading, spacing: 2.0) {
@@ -182,6 +200,8 @@ struct HomeScreen_Previews: PreviewProvider {
             viewModel.updateWithUserAvatar(avatarImage)
         }
         
+        viewModel.showSessionVerificationBanner()
+        
         return NavigationView {
             HomeScreen(context: viewModel.context)
         }

ElementX/Sources/Screens/SessionVerification/SessionVerificationCoordinator.swift

@@ -0,0 +1,67 @@
+//
+// Copyright 2021 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
+
+struct SessionVerificationCoordinatorParameters {
+    let sessionVerificationControllerProxy: SessionVerificationControllerProxyProtocol
+}
+
+final class SessionVerificationCoordinator: Coordinator, Presentable {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+    
+    private let parameters: SessionVerificationCoordinatorParameters
+    private let sessionVerificationHostingController: UIViewController
+    private var sessionVerificationViewModel: SessionVerificationViewModelProtocol
+    
+    // MARK: Public
+
+    // Must be used only internally
+    var childCoordinators: [Coordinator] = []
+    var callback: (() -> Void)?
+    
+    // MARK: - Setup
+    
+    init(parameters: SessionVerificationCoordinatorParameters) {
+        self.parameters = parameters
+        
+        let viewModel = SessionVerificationViewModel(sessionVerificationControllerProxy: parameters.sessionVerificationControllerProxy)
+        let view = SessionVerificationScreen(context: viewModel.context)
+        sessionVerificationViewModel = viewModel
+        sessionVerificationHostingController = UIHostingController(rootView: view)
+    }
+    
+    // MARK: - Public
+    
+    func start() {
+        MXLog.debug("[SessionVerificationCoordinator] did start.")
+        sessionVerificationViewModel.callback = { [weak self] action in
+            guard let self = self else { return }
+            
+            switch action {
+            case .finished:
+                self.callback?()
+            }
+        }
+    }
+    
+    func toPresentable() -> UIViewController {
+        sessionVerificationHostingController
+    }
+}

ElementX/Sources/Screens/SessionVerification/SessionVerificationModels.swift

@@ -0,0 +1,46 @@
+// 
+// Copyright 2021 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
+
+// MARK: View model
+
+enum SessionVerificationViewModelAction {
+    case finished
+}
+
+// MARK: View
+
+struct SessionVerificationViewState: BindableState {
+    var verificationState: SessionVerificationStateMachine.State = .initial
+    
+    var shouldDisableDismissButton: Bool {
+        verificationState != .verified
+    }
+    
+    var shouldDisableCancelButton: Bool {
+        verificationState == .verified
+    }
+}
+
+enum SessionVerificationViewAction {
+    case start
+    case restart
+    case accept
+    case decline
+    case dismiss
+    case cancel
+}

ElementX/Sources/Screens/SessionVerification/SessionVerificationStateMachine.swift

@@ -0,0 +1,135 @@
+//
+//  SessionVerificationStateMachine.swift
+//  ElementX
+//
+//  Created by Stefan Ceriu on 15/06/2022.
+//  Copyright © 2022 Element. All rights reserved.
+//
+
+import Foundation
+import SwiftState
+
+class SessionVerificationStateMachine {
+    /// States the SessionVerificationViewModel can find itself in
+    enum State: StateType {
+        /// The initial state, before verification started
+        case initial
+        /// Waiting for verification acceptance
+        case requestingVerification
+        /// Verification accepted and emojis received
+        case showingChallenge(emojis: [SessionVerificationEmoji])
+        /// Emojis match locally
+        case acceptingChallenge(emojis: [SessionVerificationEmoji])
+        /// Emojis do not match locally
+        case decliningChallenge(emojis: [SessionVerificationEmoji])
+        /// Verification successful
+        case verified
+        /// User requested verification cancellation
+        case cancelling
+        /// The verification has been cancelled, remotely or locally
+        case cancelled
+    }
+    
+    /// Events that can be triggered on the SessionVerification state machine
+    enum Event: EventType {
+        /// Request verification
+        case requestVerification
+        /// Has received emojis
+        case didReceiveChallenge(emojis: [SessionVerificationEmoji])
+        /// Emojis match
+        case acceptChallenge
+        /// Emojis do not match
+        case declineChallenge
+        /// Remote accepted challenge
+        case didAcceptChallenge
+        /// Request cancellation
+        case cancel
+        /// Verification cancelled
+        case didCancel
+        /// Request failed
+        case didFail
+        /// Restart the verification flow
+        case restart
+    }
+    
+    private let stateMachine: StateMachine<State, Event>
+    
+    var state: State {
+        stateMachine.state
+    }
+
+    // swiftlint:disable cyclomatic_complexity
+    init() {
+        stateMachine = StateMachine(state: .initial) { machine in
+            machine.addRoutes(event: .requestVerification, transitions: [ .initial => .requestingVerification ])
+            machine.addRoutes(event: .didFail, transitions: [ .requestingVerification => .initial ])
+            
+            machine.addRoutes(event: .cancel, transitions: [ .requestingVerification => .cancelling ])
+            machine.addRoutes(event: .didCancel, transitions: [ .requestingVerification => .cancelled ])
+            
+            // Cancellation request from the other party should either take us from `.cancelling`
+            // to `.cancelled` or keep us in `.cancelled` if already there. There is more `.didCancel`
+            // handling in `addRouteMapping` for states containing associated values
+            machine.addRoutes(event: .didCancel, transitions: [ .cancelling => .cancelled ])
+            machine.addRoutes(event: .didCancel, transitions: [ .cancelled => .cancelled ])
+            machine.addRoutes(event: .didFail, transitions: [ .cancelled => .cancelled ])
+            
+            machine.addRoutes(event: .restart, transitions: [ .cancelled => .initial ])
+            
+            // Transitions with associated values need to be handled through `addRouteMapping`
+            machine.addRouteMapping { event, fromState, _ in
+                switch (event, fromState) {
+                case (.didReceiveChallenge(let emojis), .requestingVerification):
+                    return .showingChallenge(emojis: emojis)
+                
+                case (.acceptChallenge, .showingChallenge(let emojis)):
+                    return .acceptingChallenge(emojis: emojis)
+                case (.didFail, .acceptingChallenge(let emojis)):
+                    return .showingChallenge(emojis: emojis)
+                
+                case (.didAcceptChallenge, .acceptingChallenge):
+                    return .verified
+                
+                case (.declineChallenge, .showingChallenge(let emojis)):
+                    return .decliningChallenge(emojis: emojis)
+                case (.didFail, .decliningChallenge(let emojis)):
+                    return .showingChallenge(emojis: emojis)
+                
+                case (.cancel, .showingChallenge):
+                    return .cancelling
+                case (.cancel, .acceptingChallenge):
+                    return .cancelling
+                case (.cancel, .decliningChallenge):
+                    return .cancelling
+                
+                case (.didCancel, .showingChallenge):
+                    return .cancelled
+                case (.didCancel, .acceptingChallenge):
+                    return .cancelled
+                case (.didCancel, .decliningChallenge):
+                    return .cancelled
+                    
+                default:
+                    return nil
+                }
+            }
+        }
+    }
+    // swiftlint:enable cyclomatic_complexity
+    
+    /// Attempt to move the state machine to another state through an event
+    /// It will either invoke the `transitionHandler` or the `errorHandler` depending on its current state
+    func processEvent(_ event: Event) {
+        stateMachine.tryEvent(event)
+    }
+    
+    /// Registers a callback for processing state machine transitions
+    func addTransitionHandler(_ handler: @escaping StateMachine<State, Event>.Handler) {
+        stateMachine.addAnyHandler(.any => .any, handler: handler)
+    }
+    
+    /// Registers a callback for processing state machine errors
+    func addErrorHandler(_ handler: @escaping StateMachine<State, Event>.Handler) {
+        stateMachine.addErrorHandler(handler: handler)
+    }
+}

ElementX/Sources/Screens/SessionVerification/SessionVerificationViewModel.swift

@@ -0,0 +1,164 @@
+//
+// Copyright 2021 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
+
+typealias SessionVerificationViewModelType = StateStoreViewModel<SessionVerificationViewState, SessionVerificationViewAction>
+
+class SessionVerificationViewModel: SessionVerificationViewModelType, SessionVerificationViewModelProtocol {
+
+    // MARK: - Properties
+
+    // MARK: Private
+    
+    private let sessionVerificationControllerProxy: SessionVerificationControllerProxyProtocol
+    
+    private var stateMachine: SessionVerificationStateMachine
+
+    // MARK: Public
+
+    var callback: ((SessionVerificationViewModelAction) -> Void)?
+
+    // MARK: - Setup
+
+    init(sessionVerificationControllerProxy: SessionVerificationControllerProxyProtocol,
+         initialState: SessionVerificationViewState = SessionVerificationViewState()) {
+        
+        self.sessionVerificationControllerProxy = sessionVerificationControllerProxy
+        
+        stateMachine = SessionVerificationStateMachine()
+        
+        super.init(initialViewState: initialState)
+        
+        setupStateMachine()
+        
+        sessionVerificationControllerProxy.callbacks
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] callback in
+                guard let self = self else { return }
+                
+                switch callback {
+                case .receivedVerificationData(let emojis):
+                    self.stateMachine.processEvent(.didReceiveChallenge(emojis: emojis))
+                case .finished:
+                    self.stateMachine.processEvent(.didAcceptChallenge)
+                case .cancelled:
+                    self.stateMachine.processEvent(.didCancel)
+                case .failed:
+                    self.stateMachine.processEvent(.didFail)
+                }
+            }.store(in: &cancellables)
+    }
+    
+    // MARK: - Public
+    
+    override func process(viewAction: SessionVerificationViewAction) async {
+        switch viewAction {
+        case .start:
+            stateMachine.processEvent(.requestVerification)
+        case .restart:
+            stateMachine.processEvent(.restart)
+        case .dismiss:
+            callback?(.finished)
+        case .cancel:
+            guard stateMachine.state == .initial ||
+                    stateMachine.state == .verified ||
+                    stateMachine.state == .cancelled else {
+                stateMachine.processEvent(.cancel)
+                return
+            }
+            
+            callback?(.finished)
+        case .accept:
+            stateMachine.processEvent(.acceptChallenge)
+        case .decline:
+            stateMachine.processEvent(.declineChallenge)
+        }
+    }
+    
+    // MARK: - Private
+    
+    private func setupStateMachine() {
+        stateMachine.addTransitionHandler { [weak self] context in
+            guard let self = self else { return }
+                
+            self.state.verificationState = context.toState
+            
+            switch (context.fromState, context.event, context.toState) {
+            case (.initial, .requestVerification, .requestingVerification):
+                self.requestVerification()
+            case (.showingChallenge, .acceptChallenge, .acceptingChallenge):
+                self.acceptChallenge()
+            case (.showingChallenge, .declineChallenge, .decliningChallenge):
+                self.declineChallenge()
+            case (_, .cancel, .cancelling):
+                self.cancelVerification()
+            default:
+                break
+            }
+        }
+        
+        stateMachine.addErrorHandler { context in
+            fatalError("Failed transition with context: \(context)")
+        }
+    }
+    
+    private func requestVerification() {
+        Task {
+            switch await sessionVerificationControllerProxy.requestVerification() {
+            case.success:
+                // Need to wait for the callback from the remote
+                break
+            case .failure:
+                stateMachine.processEvent(.didFail)
+            }
+        }
+    }
+    
+    private func cancelVerification() {
+        Task {
+            switch await sessionVerificationControllerProxy.cancelVerification() {
+            case.success:
+                stateMachine.processEvent(.didCancel)
+            case .failure:
+                stateMachine.processEvent(.didFail)
+            }
+        }
+    }
+    
+    private func acceptChallenge() {
+        Task {
+            switch await sessionVerificationControllerProxy.approveVerification() {
+            case.success:
+                // Need to wait for the callback from the remote
+                break
+            case .failure:
+                stateMachine.processEvent(.didFail)
+            }
+        }
+    }
+    
+    private func declineChallenge() {
+        Task {
+            switch await sessionVerificationControllerProxy.declineVerification() {
+            case.success:
+                stateMachine.processEvent(.didCancel)
+            case .failure:
+                stateMachine.processEvent(.didFail)
+            }
+        }
+    }
+}

ElementX/Sources/Screens/SessionVerification/SessionVerificationViewModelProtocol.swift

@@ -0,0 +1,23 @@
+// 
+// Copyright 2021 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
+
+@MainActor
+protocol SessionVerificationViewModelProtocol {
+    var callback: ((SessionVerificationViewModelAction) -> Void)? { get set }
+    var context: SessionVerificationViewModelType.Context { get }
+}

ElementX/Sources/Screens/SessionVerification/View/SessionVerificationScreen.swift

@@ -0,0 +1,204 @@
+// 
+// Copyright 2021 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
+import MatrixRustSDK
+
+struct SessionVerificationScreen: View {
+    
+    @ObservedObject var context: SessionVerificationViewModel.Context
+    
+    // MARK: Views
+    
+    var body: some View {
+        NavigationView {
+            VStack(spacing: 32.0) {
+                Text(heading)
+                    .font(.body)
+                    .multilineTextAlignment(.center)
+                    .foregroundColor(.element.primaryContent)
+                    .accessibilityIdentifier("titleLabel")
+                
+                switch context.viewState.verificationState {
+                case .initial:
+                    StateIcon(systemName: "lock.shield")
+                    Button(ElementL10n.startVerification) {
+                        context.send(viewAction: .start)
+                    }
+                    .buttonStyle(.elementAction(.regular))
+                    .accessibilityIdentifier("startButton")
+                    
+                case .cancelled:
+                    StateIcon(systemName: "xmark.shield")
+                        .accessibilityIdentifier("sessionVerificationFailedIcon")
+                    
+                    Button(ElementL10n.globalRetry) {
+                        context.send(viewAction: .restart)
+                    }
+                    .buttonStyle(.elementAction(.regular))
+                    .accessibilityIdentifier("restartButton")
+                    
+                case .requestingVerification:
+                    ProgressView()
+                        .accessibilityIdentifier("requestingVerificationProgressView")
+                case .cancelling:
+                    ProgressView()
+                        .accessibilityIdentifier("cancellingVerificationProgressView")
+                case .acceptingChallenge:
+                    ProgressView()
+                        .accessibilityIdentifier("acceptingChallengeProgressView")
+                case .decliningChallenge:
+                    ProgressView()
+                        .accessibilityIdentifier("decliningChallengeProgressView")
+                    
+                case .showingChallenge(let emojis):
+                    HStack(spacing: 8.0) {
+                        ForEach(emojis.prefix(4), id: \.self) { emoji in
+                            EmojiView(emoji: emoji)
+                        }
+                    }
+                    HStack(spacing: 8.0) {
+                        ForEach(emojis.suffix(from: 4), id: \.self) { emoji in
+                            EmojiView(emoji: emoji)
+                        }
+                    }
+                    
+                    actionButtons
+                case .verified:
+                    StateIcon(systemName: "checkmark.shield")
+                        .accessibilityIdentifier("sessionVerificationSucceededIcon")
+                }
+                
+                Spacer()
+            }
+            .padding()
+            .padding(.top, 64)
+            .navigationBarTitleDisplayMode(.inline)
+            .navigationTitle(ElementL10n.verificationVerifyDevice)
+            .toolbar {
+                ToolbarItem(placement: .confirmationAction) {
+                    Button(ElementL10n.done) {
+                        context.send(viewAction: .dismiss)
+                    }
+                    .disabled(context.viewState.shouldDisableDismissButton)
+                    .accessibilityIdentifier("dismissButton")
+                }
+                ToolbarItem(placement: .cancellationAction) {
+                    Button(ElementL10n.actionCancel) {
+                        context.send(viewAction: .cancel)
+                    }
+                    .disabled(context.viewState.shouldDisableCancelButton)
+                    .accessibilityIdentifier("cancelButton")
+                }
+            }
+        }
+        .navigationViewStyle(StackNavigationViewStyle())
+    }
+    
+    // MARK: - Private
+    
+    private var heading: String {
+        switch context.viewState.verificationState {
+        case .initial:
+            return ElementL10n.verificationOpenOtherToVerify
+        case .requestingVerification:
+            return ElementL10n.verificationRequestWaiting
+        case .acceptingChallenge:
+            return ElementL10n.verificationRequestWaiting
+        case .decliningChallenge:
+            return ElementL10n.verificationRequestWaiting
+        case .cancelling:
+            return ElementL10n.verificationRequestWaiting
+        case .showingChallenge:
+            return ElementL10n.verificationEmojiNotice
+        case .verified:
+            return ElementL10n.verificationConclusionOkSelfNotice
+        case .cancelled:
+            return ElementL10n.verificationCancelled
+        }
+    }
+    
+    private var actionButtons: some View {
+        HStack(spacing: 16.0) {
+            Button(ElementL10n.verificationSasDoNotMatch) {
+                context.send(viewAction: .decline)
+            }
+            .buttonStyle(.elementAction(.regular, color: .red))
+            .accessibilityLabel("challengeDeclineButton")
+            
+            Button(ElementL10n.verificationSasMatch) {
+                context.send(viewAction: .accept)
+            }
+            .buttonStyle(.elementAction(.regular))
+            .accessibilityLabel("challengeAcceptButton")
+        }
+        .padding(32.0)
+    }
+    
+    struct EmojiView: View {
+        let emoji: SessionVerificationEmoji
+        
+        var body: some View {
+            VStack(spacing: 16.0) {
+                Text(emoji.symbol)
+                    .font(.largeTitle)
+                Text(emoji.description)
+                    .font(.body)
+            }
+            .padding(8.0)
+        }
+    }
+    
+    struct StateIcon: View {
+        let systemName: String
+        
+        var body: some View {
+            Image(systemName: systemName)
+                .resizable()
+                .scaledToFit()
+                .foregroundColor(.element.accent)
+                .frame(width: 100, height: 100)
+        }
+    }
+}
+
+// MARK: - Previews
+
+struct SessionVerification_Previews: PreviewProvider {
+    static var previews: some View {
+        body.preferredColorScheme(.light)
+        body.preferredColorScheme(.dark)
+    }
+
+    @ViewBuilder
+    static var body: some View {
+        Group {
+            sessionVerificationScreen(state: .initial)
+            sessionVerificationScreen(state: .requestingVerification)
+            sessionVerificationScreen(state: .cancelled)
+             
+            sessionVerificationScreen(state: .showingChallenge(emojis: MockSessionVerificationControllerProxy.emojis))
+            sessionVerificationScreen(state: .verified)
+        }
+    }
+
+    static func sessionVerificationScreen(state: SessionVerificationStateMachine.State) -> some View {
+        let viewModel = SessionVerificationViewModel(sessionVerificationControllerProxy: MockSessionVerificationControllerProxy(),
+                                                     initialState: SessionVerificationViewState(verificationState: state))
+
+        return SessionVerificationScreen(context: viewModel.context)
+    }
+}

ElementX/Sources/Services/Client/ClientProxy.swift

@@ -27,6 +27,7 @@ class ClientProxy: ClientProxyProtocol {
     
     private let client: Client
     private let backgroundTaskService: BackgroundTaskServiceProtocol
+    private var sessionVerificationControllerProxy: SessionVerificationControllerProxy?
     
     private(set) var rooms: [RoomProxy] = [] {
         didSet {
@@ -96,11 +97,25 @@ class ClientProxy: ClientProxyProtocol {
         return Data(bytes: bytes, count: bytes.count)
     }
     
+    func sessionVerificationControllerProxy() async -> Result<SessionVerificationControllerProxyProtocol, ClientProxyError> {
+        await Task.detached {
+            do {
+                let sessionVerificationController = try self.client.getSessionVerificationController()
+                return .success(SessionVerificationControllerProxy(sessionVerificationController: sessionVerificationController))
+            } catch {
+                return .failure(.failedRetrievingSessionVerificationController)
+            }
+        }
+        .value
+    }
+    
     // MARK: Private
     
     fileprivate func didReceiveSyncUpdate() {
         Benchmark.logElapsedDurationForIdentifier("ClientSync", message: "Received sync update")
         
+        callbacks.send(.receivedSyncUpdate)
+        
         Task.detached {
             await self.updateRooms()
         }

ElementX/Sources/Services/Client/ClientProxyProtocol.swift

@@ -12,11 +12,13 @@ import Combine
 
 enum ClientProxyCallback {
     case updatedRoomsList
+    case receivedSyncUpdate
 }
 
 enum ClientProxyError: Error {
     case failedRetrievingAvatarURL
     case failedRetrievingDisplayName
+    case failedRetrievingSessionVerificationController
 }
 
 protocol ClientProxyProtocol {
@@ -33,4 +35,6 @@ protocol ClientProxyProtocol {
     func mediaSourceForURLString(_ urlString: String) -> MatrixRustSDK.MediaSource
     
     func loadMediaContentForSource(_ source: MatrixRustSDK.MediaSource) throws -> Data
+    
+    func sessionVerificationControllerProxy() async -> Result<SessionVerificationControllerProxyProtocol, ClientProxyError>
 }

ElementX/Sources/Services/Room/RoomProxy.swift

@@ -53,6 +53,10 @@ class RoomProxy: RoomProxyProtocol {
         backwardStream = room.startLiveEventListener()
     }
     
+    deinit {
+        room.setDelegate(delegate: nil)
+    }
+    
     var id: String {
         room.id()
     }

ElementX/Sources/Services/Session/UserSession.swift

@@ -7,13 +7,64 @@
 //
 
 import Foundation
+import Combine
 
 class UserSession: UserSessionProtocol {
+    private var cancellables = Set<AnyCancellable>()
+    private var checkForSessionVerificationControllerCancellable: AnyCancellable?
+    
     let clientProxy: ClientProxyProtocol
     let mediaProvider: MediaProviderProtocol
+    let callbacks = PassthroughSubject<UserSessionCallback, Never>()
+    private(set) var sessionVerificationController: SessionVerificationControllerProxyProtocol?
     
     init(clientProxy: ClientProxyProtocol, mediaProvider: MediaProviderProtocol) {
         self.clientProxy = clientProxy
         self.mediaProvider = mediaProvider
+        
+        setupSessionVerificationWatchdog()
+    }
+    
+    // MARK: - Private
+    
+    private func setupSessionVerificationWatchdog() {
+        checkForSessionVerificationControllerCancellable = clientProxy.callbacks
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] callback in
+                if case .receivedSyncUpdate = callback {
+                    self?.attemptSessionVerification()
+                }
+            }
+    }
+    
+    private func attemptSessionVerification() {
+        Task {
+            switch await clientProxy.sessionVerificationControllerProxy() {
+            case .success(let sessionVerificationController):
+                tearDownSessionVerificationControllerWatchdog()
+                
+                if !sessionVerificationController.isVerified {
+                    callbacks.send(.sessionVerificationNeeded)
+                }
+                
+                self.sessionVerificationController = sessionVerificationController
+                
+                sessionVerificationController.callbacks.sink { callback in
+                    switch callback {
+                    case .finished:
+                        self.callbacks.send(.didVerifySession)
+                    default:
+                        break
+                    }
+                }.store(in: &cancellables)
+                
+            case .failure(let error):
+                MXLog.error("Failed getting session verification controller with error: \(error). Will retry on the next sync update.")
+            }
+        }
+    }
+    
+    private func tearDownSessionVerificationControllerWatchdog() {
+        checkForSessionVerificationControllerCancellable = nil
     }
 }

ElementX/Sources/Services/Session/UserSessionProtocol.swift

@@ -7,8 +7,18 @@
 //
 
 import Foundation
+import Combine
+
+enum UserSessionCallback {
+    case sessionVerificationNeeded
+    case didVerifySession
+}
 
 protocol UserSessionProtocol {
     var clientProxy: ClientProxyProtocol { get }
     var mediaProvider: MediaProviderProtocol { get }
+    
+    var sessionVerificationController: SessionVerificationControllerProxyProtocol? { get }
+    
+    var callbacks: PassthroughSubject<UserSessionCallback, Never> { get }
 }

ElementX/Sources/Services/SessionVerification/MockSessionVerificationControllerProxy.swift

@@ -0,0 +1,62 @@
+//
+//  MockSessionVerificationControllerProxy.swift
+//  ElementX
+//
+//  Created by Stefan Ceriu on 07/06/2022.
+//  Copyright © 2022 Element. All rights reserved.
+//
+
+import Foundation
+import MatrixRustSDK
+import Combine
+
+struct MockSessionVerificationControllerProxy: SessionVerificationControllerProxyProtocol {
+    var callbacks = PassthroughSubject<SessionVerificationControllerProxyCallback, Never>()
+    
+    var isVerified: Bool = false
+    
+    func requestVerification() async -> Result<Void, SessionVerificationControllerProxyError> {
+        DispatchQueue.global(qos: .background).asyncAfter(deadline: .now() + 2.0) {
+            callbacks.send(.receivedVerificationData(Self.emojis))
+        }
+        
+        return .success(())
+    }
+    
+    func approveVerification() async -> Result<Void, SessionVerificationControllerProxyError> {
+        DispatchQueue.global(qos: .background).asyncAfter(deadline: .now() + 2.0) {
+            callbacks.send(.finished)
+        }
+        
+        return .success(())
+    }
+    
+    func declineVerification() async -> Result<Void, SessionVerificationControllerProxyError> {
+        DispatchQueue.global(qos: .background).asyncAfter(deadline: .now() + 2.0) {
+            callbacks.send(.cancelled)
+        }
+        
+        return .success(())
+    }
+    
+    func cancelVerification() async -> Result<Void, SessionVerificationControllerProxyError> {
+        DispatchQueue.global(qos: .background).asyncAfter(deadline: .now() + 2.0) {
+            callbacks.send(.cancelled)
+        }
+        
+        return .success(())
+    }
+    
+    // MARK: - Private
+    
+    static var emojis: [SessionVerificationEmoji] {
+        [SessionVerificationEmoji(symbol: "🦋", description: "Butterfly"),
+         SessionVerificationEmoji(symbol: "🐘", description: "Elephant"),
+         SessionVerificationEmoji(symbol: "🦋", description: "Butterfly"),
+         SessionVerificationEmoji(symbol: "🎂", description: "Cake"),
+         SessionVerificationEmoji(symbol: "🎂", description: "Cake"),
+         SessionVerificationEmoji(symbol: "🏁", description: "Flag"),
+         SessionVerificationEmoji(symbol: "🌏", description: "Globe")
+        ]
+    }
+}

ElementX/Sources/Services/SessionVerification/SessionVerificationControllerProxy.swift

@@ -0,0 +1,124 @@
+//
+//  SessionVerificationControllerProxy.swift
+//  ElementX
+//
+//  Created by Stefan Ceriu on 06/06/2022.
+//  Copyright © 2022 Element. All rights reserved.
+//
+
+import Foundation
+import MatrixRustSDK
+import Combine
+
+private class WeakSessionVerificationControllerProxy: SessionVerificationControllerDelegate {
+    private weak var proxy: SessionVerificationControllerProxy?
+    
+    init(proxy: SessionVerificationControllerProxy) {
+        self.proxy = proxy
+    }
+    
+    // MARK: - SessionVerificationControllerDelegate
+    
+    func didReceiveVerificationData(data: [MatrixRustSDK.SessionVerificationEmoji]) {
+        proxy?.didReceiveData(data)
+    }
+    
+    func didFail() {
+        proxy?.didFail()
+    }
+    
+    func didCancel() {
+        proxy?.didCancel()
+    }
+    
+    func didFinish() {
+        proxy?.didFinish()
+    }
+}
+
+class SessionVerificationControllerProxy: SessionVerificationControllerProxyProtocol {
+    private let sessionVerificationController: SessionVerificationController
+    
+    init(sessionVerificationController: SessionVerificationController) {
+        self.sessionVerificationController = sessionVerificationController
+        sessionVerificationController.setDelegate(delegate: WeakSessionVerificationControllerProxy(proxy: self))
+    }
+    
+    deinit {
+        sessionVerificationController.setDelegate(delegate: nil)
+    }
+    
+    let callbacks = PassthroughSubject<SessionVerificationControllerProxyCallback, Never>()
+    
+    var isVerified: Bool {
+        sessionVerificationController.isVerified()
+    }
+    
+    func requestVerification() async -> Result<Void, SessionVerificationControllerProxyError> {
+        await Task.detached {
+            do {
+                try self.sessionVerificationController.requestVerification()
+                return .success(())
+            } catch {
+                return .failure(.failedRequestingVerification)
+            }
+        }
+        .value
+    }
+    
+    func approveVerification() async -> Result<Void, SessionVerificationControllerProxyError> {
+        await Task.detached {
+            do {
+                try self.sessionVerificationController.approveVerification()
+                return .success(())
+            } catch {
+                return .failure(.failedApprovingVerification)
+            }
+        }
+        .value
+    }
+    
+    func declineVerification() async -> Result<Void, SessionVerificationControllerProxyError> {
+        await Task.detached {
+            do {
+                try self.sessionVerificationController.declineVerification()
+                return .success(())
+            } catch {
+                return .failure(.failedDecliningVerification)
+            }
+        }
+        .value
+    }
+    
+    func cancelVerification() async -> Result<Void, SessionVerificationControllerProxyError> {
+        await Task.detached {
+            do {
+                try self.sessionVerificationController.cancelVerification()
+                return .success(())
+            } catch {
+                return .failure(.failedCancellingVerification)
+            }
+        }
+        .value
+    }
+    
+    // MARK: - Private
+    
+    fileprivate func didReceiveData(_ data: [MatrixRustSDK.SessionVerificationEmoji]) {
+        callbacks.send(.receivedVerificationData(data.map { emoji in
+            SessionVerificationEmoji(symbol: emoji.symbol(), description: emoji.description())
+        }))
+    }
+    
+    fileprivate func didFail() {
+        callbacks.send(.failed)
+    }
+    
+    fileprivate func didFinish() {
+        callbacks.send(.finished)
+    }
+    
+    fileprivate func didCancel() {
+        callbacks.send(.cancelled)
+    }
+}

ElementX/Sources/Services/SessionVerification/SessionVerificationControllerProxyProtocol.swift

@@ -0,0 +1,43 @@
+//
+//  SessionVerificationControllerProxyProtocol.swift
+//  ElementX
+//
+//  Created by Stefan Ceriu on 07/06/2022.
+//  Copyright © 2022 Element. All rights reserved.
+//
+
+import Foundation
+import Combine
+
+enum SessionVerificationControllerProxyError: Error {
+    case failedRequestingVerification
+    case failedApprovingVerification
+    case failedDecliningVerification
+    case failedCancellingVerification
+}
+
+enum SessionVerificationControllerProxyCallback {
+    case receivedVerificationData([SessionVerificationEmoji])
+    case finished
+    case cancelled
+    case failed
+}
+
+struct SessionVerificationEmoji: Hashable {
+    let symbol: String
+    let description: String
+}
+
+protocol SessionVerificationControllerProxyProtocol {
+    var callbacks: PassthroughSubject<SessionVerificationControllerProxyCallback, Never> { get }
+    
+    var isVerified: Bool { get }
+        
+    func requestVerification() async -> Result<Void, SessionVerificationControllerProxyError>
+    
+    func approveVerification() async -> Result<Void, SessionVerificationControllerProxyError>
+    
+    func declineVerification() async -> Result<Void, SessionVerificationControllerProxyError>
+    
+    func cancelVerification() async -> Result<Void, SessionVerificationControllerProxyError>
+}

ElementX/Sources/Services/Timeline/RoomTimelineProvider.swift

@@ -18,7 +18,9 @@ class RoomTimelineProvider: RoomTimelineProviderProtocol {
     init(roomProxy: RoomProxyProtocol) {
         self.roomProxy = roomProxy
         
-        self.roomProxy.callbacks.sink { [weak self] callback in
+        self.roomProxy.callbacks
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] callback in
             guard let self = self else { return }
             
             switch callback {

ElementX/Sources/UITestScreenIdentifier.swift

@@ -20,6 +20,7 @@ enum UITestScreenIdentifier: String {
     case splash
     case roomPlainNoAvatar
     case roomEncryptedWithAvatar
+    case sessionVerification
 }
 
 extension UITestScreenIdentifier: CustomStringConvertible {

ElementX/Sources/UITestsAppCoordinator.swift

@@ -22,13 +22,13 @@ class UITestsAppCoordinator: Coordinator {
         window.tintColor = .element.accent
         
         let screens = mockScreens()
-        screens.forEach { $0.coordinator.start() }
-        
         let rootView = UITestsRootView(mockScreens: screens) { id in
             guard let screen = screens.first(where: { $0.id == id }) else {
                 fatalError()
             }
             
+            screen.coordinator.start()
+            
             self.mainNavigationController.pushViewController(screen.coordinator.toPresentable(), animated: true)
         }
         
@@ -45,9 +45,9 @@ class UITestsAppCoordinator: Coordinator {
 }
 
 @MainActor
-struct MockScreen: Identifiable {
+class MockScreen: Identifiable {
     let id: UITestScreenIdentifier
-    var coordinator: Coordinator & Presentable {
+    lazy var coordinator: Coordinator & Presentable = {
         switch id {
         case .login:
             let router = NavigationRouter(navigationController: ElementNavigationController())
@@ -78,17 +78,24 @@ struct MockScreen: Identifiable {
         case .splash:
             return SplashScreenCoordinator()
         case .roomPlainNoAvatar:
-            let params = RoomScreenCoordinatorParameters(timelineController: MockRoomTimelineController(),
+            let parameters = RoomScreenCoordinatorParameters(timelineController: MockRoomTimelineController(),
                                                              roomName: "Some room name",
                                                              roomAvatar: nil,
                                                              roomEncryptionBadge: nil)
-            return RoomScreenCoordinator(parameters: params)
+            return RoomScreenCoordinator(parameters: parameters)
         case .roomEncryptedWithAvatar:
-            let params = RoomScreenCoordinatorParameters(timelineController: MockRoomTimelineController(),
+            let parameters = RoomScreenCoordinatorParameters(timelineController: MockRoomTimelineController(),
                                                              roomName: "Some room name",
                                                              roomAvatar: Asset.Images.appLogo.image,
                                                              roomEncryptionBadge: Asset.Images.encryptionTrusted.image)
-            return RoomScreenCoordinator(parameters: params)
+            return RoomScreenCoordinator(parameters: parameters)
+        case .sessionVerification:
+            let parameters = SessionVerificationCoordinatorParameters(sessionVerificationControllerProxy: MockSessionVerificationControllerProxy())
+            return SessionVerificationCoordinator(parameters: parameters)
         }
+    }()
+    
+    init(id: UITestScreenIdentifier) {
+        self.id = id
     }
 }

UITests/Sources/SessionVerificationUITests.swift

@@ -0,0 +1,103 @@
+//
+// Copyright 2021 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 XCTest
+import ElementX
+
+class SessionVerificationUITests: XCTestCase {
+    
+    func testChallengeMatches() {
+        let app = Application.launch()
+        app.goToScreenWithIdentifier(.sessionVerification)
+        
+        XCTAssert(app.navigationBars["Verify this session"].exists)
+        
+        XCTAssert(app.buttons["startButton"].exists)
+        XCTAssert(app.buttons["dismissButton"].exists)
+        XCTAssert(app.staticTexts["titleLabel"].exists)
+        
+        app.buttons["startButton"].tap()
+        
+        XCTAssert(app.activityIndicators["requestingVerificationProgressView"].exists)
+        XCTAssert(app.buttons["cancelButton"].exists)
+        
+        XCTAssert(app.buttons["challengeAcceptButton"].waitForExistence(timeout: 5.0))
+        XCTAssert(app.buttons["challengeDeclineButton"].waitForExistence(timeout: 5.0))
+        XCTAssert(app.buttons["cancelButton"].waitForExistence(timeout: 5.0))
+        
+        app.buttons["challengeAcceptButton"].tap()
+                  
+        XCTAssert(app.activityIndicators["acceptingChallengeProgressView"].exists)
+        XCTAssert(app.buttons["cancelButton"].exists)
+        
+        XCTAssert(app.images["sessionVerificationSucceededIcon"].waitForExistence(timeout: 5.0))
+        
+        XCTAssert(app.buttons["dismissButton"].exists)
+        app.buttons["dismissButton"].tap()
+    }
+    
+    func testChallengeDoesNotMatch() {
+        let app = Application.launch()
+        app.goToScreenWithIdentifier(.sessionVerification)
+        
+        XCTAssert(app.navigationBars["Verify this session"].exists)
+        
+        XCTAssert(app.buttons["startButton"].exists)
+        XCTAssert(app.buttons["dismissButton"].exists)
+        XCTAssert(app.staticTexts["titleLabel"].exists)
+        
+        app.buttons["startButton"].tap()
+        
+        XCTAssert(app.activityIndicators["requestingVerificationProgressView"].exists)
+        XCTAssert(app.buttons["cancelButton"].exists)
+        
+        XCTAssert(app.buttons["challengeAcceptButton"].waitForExistence(timeout: 5.0))
+        XCTAssert(app.buttons["challengeDeclineButton"].waitForExistence(timeout: 5.0))
+        XCTAssert(app.buttons["cancelButton"].waitForExistence(timeout: 5.0))
+        
+        app.buttons["challengeDeclineButton"].tap()
+                          
+        XCTAssert(app.images["sessionVerificationFailedIcon"].exists)
+        XCTAssert(app.buttons["restartButton"].exists)
+        
+        XCTAssert(app.buttons["dismissButton"].exists)
+        app.buttons["dismissButton"].tap()
+    }
+    
+    func testSessionVerificationCancelation() {
+        let app = Application.launch()
+        app.goToScreenWithIdentifier(.sessionVerification)
+        
+        XCTAssert(app.navigationBars["Verify this session"].exists)
+        
+        XCTAssert(app.buttons["startButton"].exists)
+        XCTAssert(app.buttons["dismissButton"].exists)
+        XCTAssert(app.staticTexts["titleLabel"].exists)
+        
+        app.buttons["startButton"].tap()
+        
+        XCTAssert(app.activityIndicators["requestingVerificationProgressView"].exists)
+        XCTAssert(app.buttons["cancelButton"].exists)
+        
+        app.buttons["cancelButton"].tap()
+        
+        XCTAssert(app.images["sessionVerificationFailedIcon"].exists)
+        XCTAssert(app.buttons["restartButton"].exists)
+        
+        XCTAssert(app.buttons["dismissButton"].exists)
+        app.buttons["dismissButton"].tap()
+    }
+}

UnitTests/Sources/SessionVerificationStateMachineTests.swift

@@ -0,0 +1,94 @@
+//
+//  SessionVerificationStateMachineTests.swift
+//  UnitTests
+//
+//  Created by Stefan Ceriu on 28/06/2022.
+//  Copyright © 2022 Element. All rights reserved.
+//
+
+import XCTest
+
+@testable import ElementX
+
+@MainActor
+class SessionVerificationStateMachineTests: XCTestCase {
+    private var stateMachine: SessionVerificationStateMachine!
+    
+    @MainActor
+    override func setUpWithError() throws {
+        stateMachine = SessionVerificationStateMachine()
+    }
+    
+    func testAcceptChallenge() {
+        XCTAssertEqual(stateMachine.state, .initial)
+        
+        stateMachine.processEvent(.requestVerification)
+        XCTAssertEqual(stateMachine.state, .requestingVerification)
+        
+        stateMachine.processEvent(.didReceiveChallenge(emojis: MockSessionVerificationControllerProxy.emojis))
+        XCTAssertEqual(stateMachine.state, .showingChallenge(emojis: MockSessionVerificationControllerProxy.emojis))
+        
+        stateMachine.processEvent(.acceptChallenge)
+        XCTAssertEqual(stateMachine.state, .acceptingChallenge(emojis: MockSessionVerificationControllerProxy.emojis))
+        
+        stateMachine.processEvent(.didAcceptChallenge)
+        XCTAssertEqual(stateMachine.state, .verified)
+    }
+    
+    func testDeclineChallenge() {
+        XCTAssertEqual(stateMachine.state, .initial)
+        
+        stateMachine.processEvent(.requestVerification)
+        XCTAssertEqual(stateMachine.state, .requestingVerification)
+        
+        stateMachine.processEvent(.didReceiveChallenge(emojis: MockSessionVerificationControllerProxy.emojis))
+        XCTAssertEqual(stateMachine.state, .showingChallenge(emojis: MockSessionVerificationControllerProxy.emojis))
+        
+        stateMachine.processEvent(.declineChallenge)
+        XCTAssertEqual(stateMachine.state, .decliningChallenge(emojis: MockSessionVerificationControllerProxy.emojis))
+        
+        stateMachine.processEvent(.didCancel)
+        XCTAssertEqual(stateMachine.state, .cancelled)
+        
+        stateMachine.processEvent(.restart)
+        XCTAssertEqual(stateMachine.state, .initial)
+    }
+    
+    func testCancellation() {
+        XCTAssertEqual(stateMachine.state, .initial)
+        
+        stateMachine.processEvent(.requestVerification)
+        XCTAssertEqual(stateMachine.state, .requestingVerification)
+        
+        stateMachine.processEvent(.cancel)
+        XCTAssertEqual(stateMachine.state, .cancelling)
+        
+        stateMachine.processEvent(.didCancel)
+        XCTAssertEqual(stateMachine.state, .cancelled)
+        
+        // This duplication is intentional
+        stateMachine.processEvent(.didCancel)
+        XCTAssertEqual(stateMachine.state, .cancelled)
+        
+        stateMachine.processEvent(.restart)
+        XCTAssertEqual(stateMachine.state, .initial)
+        
+        stateMachine.processEvent(.requestVerification)
+        XCTAssertEqual(stateMachine.state, .requestingVerification)
+        
+        stateMachine.processEvent(.didReceiveChallenge(emojis: MockSessionVerificationControllerProxy.emojis))
+        XCTAssertEqual(stateMachine.state, .showingChallenge(emojis: MockSessionVerificationControllerProxy.emojis))
+        
+        stateMachine.processEvent(.cancel)
+        XCTAssertEqual(stateMachine.state, .cancelling)
+        
+        stateMachine.processEvent(.didCancel)
+        XCTAssertEqual(stateMachine.state, .cancelled)
+        
+        stateMachine.processEvent(.restart)
+        XCTAssertEqual(stateMachine.state, .initial)
+        
+        stateMachine.processEvent(.restart)
+        XCTAssertEqual(stateMachine.state, .initial)
+    }
+}

UnitTests/Sources/SessionVerificationViewModelTests.swift

@@ -0,0 +1,154 @@
+// 
+// Copyright 2021 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 XCTest
+import Combine
+
+@testable import ElementX
+
+@MainActor
+class SessionVerificationViewModelTests: XCTestCase {
+    
+    var viewModel: SessionVerificationViewModelProtocol!
+    var context: SessionVerificationViewModelType.Context!
+    var sessionVerificationController: SessionVerificationControllerProxyProtocol!
+    
+    @MainActor
+    override func setUpWithError() throws {
+        sessionVerificationController = MockSessionVerificationControllerProxy()
+        viewModel = SessionVerificationViewModel(sessionVerificationControllerProxy: sessionVerificationController)
+        context = viewModel.context
+    }
+    
+    func testRequestVerification() async {
+        XCTAssertEqual(context.viewState.verificationState, .initial)
+        
+        context.send(viewAction: .start)
+        
+        await Task.yield()
+        
+        XCTAssertEqual(context.viewState.verificationState, .requestingVerification)
+    }
+    
+    func testVerificationCancellation() async {
+        XCTAssertEqual(context.viewState.verificationState, .initial)
+        
+        context.send(viewAction: .start)
+        
+        context.send(viewAction: .cancel)
+        
+        await Task.yield()
+        
+        XCTAssertEqual(context.viewState.verificationState, .cancelling)
+        
+        await Task.yield()
+        
+        XCTAssertEqual(context.viewState.verificationState, .cancelled)
+        
+        context.send(viewAction: .restart)
+        
+        await Task.yield()
+        
+        XCTAssertEqual(context.viewState.verificationState, .initial)
+    }
+    
+    func testReceiveChallenge() {
+        setupChallengeReceived()
+    }
+    
+    func testAcceptChallenge() {
+        
+        setupChallengeReceived()
+        
+        let waitForAcceptance = XCTestExpectation(description: "Wait for acceptance")
+        
+        let cancellable = sessionVerificationController.callbacks
+            .debounce(for: .seconds(2.0), scheduler: DispatchQueue.main)
+            .sink { callback in
+                switch callback {
+                case .finished:
+                    waitForAcceptance.fulfill()
+                default:
+                    XCTFail("Unexpected session verification controller callback")
+                }
+            }
+        
+        defer {
+            cancellable.cancel()
+        }
+                
+        context.send(viewAction: .accept)
+        
+        wait(for: [waitForAcceptance], timeout: 10.0)
+        
+        XCTAssertEqual(context.viewState.verificationState, .verified)
+    }
+    
+    func testDeclineChallenge() {
+        
+        setupChallengeReceived()
+        
+        let expectation = XCTestExpectation(description: "Wait for cancellation")
+        
+        let cancellable = sessionVerificationController.callbacks
+            .debounce(for: .seconds(2.0), scheduler: DispatchQueue.main)
+            .sink { callback in
+                switch callback {
+                case .cancelled:
+                    expectation.fulfill()
+                default:
+                    XCTFail("Unexpected session verification controller callback")
+                }
+            }
+        
+        defer {
+            cancellable.cancel()
+        }
+                
+        context.send(viewAction: .decline)
+        
+        wait(for: [expectation], timeout: 10.0)
+        
+        XCTAssertEqual(context.viewState.verificationState, .cancelled)
+    }
+    
+    // MARK: - Private
+    
+    private func setupChallengeReceived() {
+        let expectation = XCTestExpectation(description: "Wait for challenge")
+        
+        let cancellable = sessionVerificationController.callbacks
+            .debounce(for: .seconds(2.0), scheduler: DispatchQueue.main)
+            .sink { callback in
+                switch callback {
+                case .receivedVerificationData:
+                    expectation.fulfill()
+                default:
+                    break
+                }
+            }
+        
+        defer {
+            cancellable.cancel()
+        }
+        
+        context.send(viewAction: .start)
+        
+        wait(for: [expectation], timeout: 10.0)
+        
+        XCTAssertEqual(context.viewState.verificationState, .showingChallenge(emojis: MockSessionVerificationControllerProxy.emojis))
+    }
+}

project.yml

@@ -32,6 +32,7 @@ packages:
   MatrixRustSDK:
     url: https://github.com/matrix-org/matrix-rust-components-swift.git
     exactVersion: 1.0.11-alpha
+    # path: ../matrix-rust-components-swift
   DesignKit:
     path: ./
   DTCoreText: