[ios] Open cre "learn how" though app group

Use AppGround to open "learn how" link.

Bug: 1045455
Change-Id: Ic9c8bb4c12a51804f2d95510d401777fa576da87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2115543
Commit-Queue: David Jean <djean@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753546}

ios/chrome/common/app_group/app_group_constants.h

@@ -118,6 +118,7 @@ extern NSString* const kOpenCommandSourceTodayExtension;
 extern NSString* const kOpenCommandSourceContentExtension;
 extern NSString* const kOpenCommandSourceSearchExtension;
 extern NSString* const kOpenCommandSourceShareExtension;
+extern NSString* const kOpenCommandSourceCredentialsExtension;
 
 // The value of the key for the sharedDefaults used by the Content Widget.
 extern NSString* const kSuggestedItems;

ios/chrome/common/app_group/app_group_constants.mm

@@ -58,6 +58,8 @@ NSString* const kOpenCommandSourceTodayExtension = @"ChromeTodayExtension";
 NSString* const kOpenCommandSourceContentExtension = @"ChromeContentExtension";
 NSString* const kOpenCommandSourceSearchExtension = @"ChromeSearchExtension";
 NSString* const kOpenCommandSourceShareExtension = @"ChromeShareExtension";
+NSString* const kOpenCommandSourceCredentialsExtension =
+    @"ChromeCredentialsExtension";
 
 NSString* const kSuggestedItems = @"SuggestedItems";
 

ios/chrome/credential_provider_extension/BUILD.gn

@@ -51,6 +51,7 @@ ios_appex_bundle("credential_provider_extension") {
   deps = [
     ":system_strings",
     "//base",
+    "//ios/chrome/common/app_group:command",
     "//ios/chrome/common/ui/colors",
     "//ios/chrome/common/ui/reauthentication",
     "//ios/chrome/credential_provider_extension/resources",
@@ -68,6 +69,7 @@ ios_appex_bundle("credential_provider_extension") {
   ]
 
   extra_substitutions = [
+    "CHROME_CHANNEL_SCHEME=$url_channel_scheme",
     "CHROMIUM_SHORT_NAME=$chromium_short_name",
     "CREDENTIAL_PROVIDER_EXTENSION_BUNDLE_ID=$chromium_bundle_id.CredentialProviderExtension",
   ]

ios/chrome/credential_provider_extension/Info.plist

@@ -32,5 +32,7 @@
 		<key>NSExtensionPointIdentifier</key>
 		<string>com.apple.authentication-services-credential-provider-ui</string>
 	</dict>
+	<key>KSChannelChromeScheme</key>
+	<string>${CHROME_CHANNEL_SCHEME}</string>
 </dict>
 </plist>

ios/chrome/credential_provider_extension/entitlements/external/credential_provider_extension.appex.entitlements

@@ -8,7 +8,7 @@
 	<string>$(AppIdentifierPrefix)$(CFBundleIdentifier)</string>
 	<key>com.apple.security.application-groups</key>
 	<array>
-		<string>group.${IOS_BUNDLE_ID_PREFIX}.CredentialProvider</string>
+		<string>group.${IOS_BUNDLE_ID_PREFIX}.chrome</string>
 	</array>
 </dict>
 </plist>

ios/chrome/credential_provider_extension/reauthentication_handler.mm

@@ -6,6 +6,8 @@
 
 #import "base/logging.h"
 #include "base/strings/sys_string_conversions.h"
+#import "ios/chrome/common/app_group/app_group_command.h"
+#import "ios/chrome/common/app_group/app_group_constants.h"
 #import "ios/chrome/common/ui/reauthentication/reauthentication_module.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ -59,6 +61,7 @@
                                    @"passcode on your device.")
                 preferredStyle:UIAlertControllerStyleAlert];
 
+  __weak UIResponder* opener = [self openerFromViewController:viewController];
   UIAlertAction* learnAction = [UIAlertAction
       actionWithTitle:
           NSLocalizedString(
@@ -66,19 +69,10 @@
               @"Learn How")
                 style:UIAlertActionStyleDefault
               handler:^(UIAlertAction*) {
-                UIResponder* responder = viewController;
-                while (responder) {
-                  if ([responder respondsToSelector:@selector(openURL:)]) {
-                    [responder
-                        performSelector:@selector(openURL:)
-                             withObject:
-                                 [NSURL URLWithString:base::SysUTF8ToNSString(
-                                                          kPasscodeArticleURL)]
-                             afterDelay:0];
-                    break;
-                  }
-                  responder = responder.nextResponder;
-                }
+                [self openAppWithURL:[NSURL
+                                         URLWithString:base::SysUTF8ToNSString(
+                                                           kPasscodeArticleURL)]
+                              opener:opener];
                 completionHandler(ReauthenticationResult::kFailure);
               }];
   [alertController addAction:learnAction];
@@ -96,4 +90,34 @@
                              completion:nil];
 }
 
+#pragma mark - Private
+
+// Returns first responder up the chain that can open a URL.
+- (UIResponder*)openerFromViewController:(UIViewController*)viewController {
+  UIResponder* responder = viewController;
+  while (responder) {
+    if ([responder respondsToSelector:@selector(openURL:)]) {
+      return responder;
+    }
+    responder = responder.nextResponder;
+  }
+  return nil;
+}
+
+// Open URL through app group commands.
+- (void)openAppWithURL:(NSURL*)URL opener:(UIResponder*)opener {
+  AppGroupCommand* command = [[AppGroupCommand alloc]
+      initWithSourceApp:app_group::kOpenCommandSourceCredentialsExtension
+         URLOpenerBlock:^(NSURL* openURL) {
+           if ([opener respondsToSelector:@selector(openURL:)]) {
+             [opener performSelector:@selector(openURL:)
+                          withObject:openURL
+                          afterDelay:0];
+           }
+         }];
+
+  [command prepareToOpenURL:URL];
+  [command executeInApp];
+}
+
 @end