[dotnet] macOS/MacCatalyst Archive and publishing support (#15720)

These changes are required to support Archive and Publishing for .NET macOS/MacCatalyst projects from VS for Mac.

Co-authored-by: Alex Soto <alex@alexsoto.me>

msbuild/Xamarin.MacDev.Tasks.Core/Tasks/ArchiveTaskBase.cs

@@ -42,7 +42,6 @@ namespace Xamarin.MacDev.Tasks
 
 		public string SolutionPath { get; set; }
 
-		[Required]
 		public string SigningKey { get; set; }
 
 		public ITaskItem [] WatchAppReferences { get; set; }
@@ -205,7 +204,8 @@ namespace Xamarin.MacDev.Tasks
 				if (icons.Count > 0)
 					props.Add ("IconPaths", icons);
 
-				props.Add ("SigningIdentity", SigningKey);
+				if (!string.IsNullOrEmpty (SigningKey))
+					props.Add ("SigningIdentity", SigningKey);
 
 				arInfo.Add ("ApplicationProperties", props);
 				arInfo.Add ("ArchiveVersion", new PNumber (2));

msbuild/Xamarin.Shared/Xamarin.Shared.targets

@@ -289,7 +289,7 @@ Copyright (C) 2018 Microsoft. All rights reserved.
 		<Delete SessionId="$(BuildSessionId)" Condition="'$(IsMacEnabled)' == 'true'" Files="$(DeviceSpecificOutputPath)bundler.stamp" />
 	</Target>
 
-	<Target Name="_CleanAppBundleRootDirectory" Condition="'$(_PlatformName)' == 'MacCatalyst' Or '$(_PlatformName)' == 'macOS'">
+	<Target Name="_CleanAppBundleRootDirectory" Condition="'$(_PlatformName)' == 'MacCatalyst' Or '$(_PlatformName)' == 'macOS'" DependsOnTargets="_GenerateBundleName">
 		<!-- There shouldn't be any files in the root directory of the app bundle for macOS or Mac Catalyst (signing will fail) -->
 
 		<!-- Delete any crash dumps in the app bundle that might exist. Ref: https://github.com/xamarin/xamarin-macios/issues/12320 -->
@@ -1425,6 +1425,7 @@ Copyright (C) 2018 Microsoft. All rights reserved.
 			<_AppBundleManifestPath>$(_AppBundlePath)$(_AppBundleManifestRelativePath)Info.plist</_AppBundleManifestPath>
 			<!-- We should only write out a compiled app manifest if we're creating an app bundle -->
 			<_CreateAppManifest>$(_CanOutputAppBundle)</_CreateAppManifest>
+			<_CreateAppManifest Condition="'$(IsAppDistribution)' == 'true'">false</_CreateAppManifest>
 			<_TemporaryAppManifest>$(DeviceSpecificIntermediateOutputPath)AppManifest.plist</_TemporaryAppManifest>
 		</PropertyGroup>
 	</Target>
@@ -1829,6 +1830,7 @@ Copyright (C) 2018 Microsoft. All rights reserved.
 
 		<_CodesignAppBundleDependsOn>
 			$(_CodesignAppBundleDependsOn);
+			_DetectSigningIdentity;
 			_CleanAppBundleRootDirectory;
 			_EmbedProvisionProfile;
 			_CollectCodesigningData;
@@ -2728,7 +2730,17 @@ Copyright (C) 2018 Microsoft. All rights reserved.
 		</CompileProductDefinition>
 	</Target>
 
-	<Target Name="_CreateInstaller" Condition="'$(CreatePackage)' == 'true' And '$(_CanOutputAppBundle)' == 'true'" DependsOnTargets="Codesign;_CompileProductDefinition;_WriteAppManifest">
+	<PropertyGroup>
+		<_CreateInstallerDependsOn>
+			_GenerateBundleName;
+			_GetAppBundleEntitlements;
+			Codesign;
+			_CompileProductDefinition;
+			_WriteAppManifest
+		</_CreateInstallerDependsOn>
+	</PropertyGroup>
+
+	<Target Name="_CreateInstaller" Condition="'$(CreatePackage)' == 'true' And '$(_CanOutputAppBundle)' == 'true'" DependsOnTargets="$(_CreateInstallerDependsOn)">
 		<PropertyGroup>
 			<PkgPackageDir Condition="'$(PkgPackageDir)' == ''">$(TargetDir)</PkgPackageDir>
 		</PropertyGroup>
@@ -2751,6 +2763,25 @@ Copyright (C) 2018 Microsoft. All rights reserved.
 		</CreateInstallerPackage>
 	</Target>
 
+	<!-- 
+		Creates a plist with the entitlements used to sign the App bundle.
+		MacCatalyst apps don't have a compiled entitlements file in the app bundle, 
+		so to re-sign the app we need to reuse the entitlements that were originally used to sign it
+	-->
+	<Target Name="_GetAppBundleEntitlements" Condition="'$(IsAppDistribution)' == 'true' And '$(CodesignEntitlements)' == '' And Exists('$(AppBundleDir)\Contents\_CodeSignature')">
+		<PropertyGroup>
+			<_CompiledCodesignEntitlements>$(DeviceSpecificIntermediateOutputPath)AppBundleEntitlements.plist</_CompiledCodesignEntitlements>
+		</PropertyGroup>
+
+		<Delete SessionId="$(BuildSessionId)" Condition="'$(IsMacEnabled)' == 'true'" Files="$(_CompiledCodesignEntitlements)" />
+		
+		<!-- The following command grabs the entitlements that are part of the signature of the app bundle, and creates a plist containing those -->
+		<Exec 
+			SessionId="$(BuildSessionId)"
+			Condition="'$(IsMacEnabled)' == 'true'"
+			Command="codesign --display --entitlements '$(_CompiledCodesignEntitlements)' --xml '$(AppBundleDir)'" />
+	</Target>
+
 	<PropertyGroup>
 		<!-- Extensibility point for VS Publishing Workflow -->
 		<_BeforeCreateIpaForDistributionDependsOn />