アプリ Flip のサンプルアプリ
は、アプリ切り替えと互換性のある、iOS でのアカウント リンクの統合を示しています。
このアプリを使用すると、受信したアプリ切り替えユニバーサルへの応答方法を確認できます
Google モバイルアプリからリンクできます。
サンプルアプリは、App Flip Test Tool for
iOS、
これを使用して、事前に iOS アプリとアプリ切り替えとの統合を検証できます。
Google とのアカウントのリンクを設定します。このアプリはユニバーサル リンクをシミュレートします
アプリ切り替えが有効な場合に、Google モバイルアプリによってトリガーされます。
仕組み
Google アプリとアプリが行うフローステップは次のとおりです。
アプリ切り替えが発生するタイミング:
Google アプリがアプリのユニバーサル リンクを開こうとします。できること
そのアプリがユーザーのデバイスにインストールされていて、
説明します。詳しくは、ユニバーサル リンクのサポートをご覧ください。
client_id と redirect_uri パラメータがエンコードされていることをアプリで確認
想定される Google ユニバーサル リンクと一致する。
認証に成功したら、認証でリダイレクト URI を呼び出します。
できます。次のコードサンプルを使用します。
funcreturnAuthCode(code:String,state:String,redirectUri:String){varredirectURL=URL(string:redirectUri)varcomponents=URLComponents(url:redirectURL,resolvingAgainstBaseURL:false)// Return the authorization code and original stateletparamAuthCode=URLQueryItem(name:"code",value:code)letparamState=URLQueryItem(name:"state",value:state)components?.queryItems=[paramAuthCode,paramState]ifletresultURL=components?.url{UIApplication.shared.open(resultURL,options:[UIApplicationOpenURLOptionUniversalLinksOnly:true],completionHandler:nil)}}
エラーが発生した場合は、代わりにエラー結果をリダイレクト URI に添付します。
次のコードサンプルを使用します。
funcreturnError(redirectUri:String){varredirectURL=URL(string:redirectUri)varcomponents=URLComponents(url:redirectURL,resolvingAgainstBaseURL:false)// Return the authorization code and original stateletparamError=URLQueryItem(name:"error",value:"invalid_request")letparamDescription=URLQueryItem(name:"error_description",value:"Invalid Request")components?.queryItems=[paramError,paramDescription]ifletresultURL=components?.url{UIApplication.shared.open(resultURL,options:[UIApplicationOpenURLOptionUniversalLinksOnly:true],completionHandler:nil)}}
アプリのユニバーサル リンクのクエリ パラメータ
Google アプリでアプリを開くと、アプリのユニバーサル リンクには次のものが含まれます
クエリ パラメータ:
client_id（String）: アプリで登録されている Google client_id。
scope（List of String）: リクエストされたスペース区切りのスコープのリスト。
state（String）: 認証を検証するために Google が使用するノンス
Google の送信リクエストに対するレスポンスであることがわかります。
redirect_uri（String）: Google のユニバーサル リンク。「フリップ」開く URI
結果を渡します。
[null,null,["最終更新日 2025-07-25 UTC。"],[[["\u003cp\u003eOAuth-based App Flip linking simplifies account linking for Google app users by enabling them to seamlessly open your iOS app for authorization.\u003c/p\u003e\n"],["\u003cp\u003eTo support App Flip, you need to modify your iOS app to handle universal links, validate incoming parameters, and return authorization codes or errors to the Google app.\u003c/p\u003e\n"],["\u003cp\u003eYour authorization endpoint must be configured to accept Google's App Flip redirect URLs and perform client verification for incoming requests.\u003c/p\u003e\n"],["\u003cp\u003eThe App Flip sample app and test tool provide a practical demonstration and verification environment for your iOS app's integration with App Flip.\u003c/p\u003e\n"]]],[],null,["OAuth-based App Flip linking (App Flip) opens your iOS app from a Google app\nto help the Google app user link their account more easily. You need to make\nminor code changes to your iOS app to implement this feature.\n\nIn this document, you learn how to modify your iOS app to support App Flip.\n\nTry the sample\n\nThe App Flip [sample app](https://github.com/googlesamples/identity-appflip-ios)\ndemonstrates an account linking integration on iOS that's App Flip-compatible.\nYou can use this app to verify how to respond to an incoming App Flip universal\nlink from Google mobile apps.\n\nThe sample app is preconfigured to integrate with the [App Flip Test Tool for\niOS](https://github.com/googlesamples/identity-appflip-tester-ios),\nwhich you can use to verify your iOS app's integration with App Flip before\nyou configure account linking with Google. This app simulates the universal link\ntriggered by Google mobile apps when App Flip is enabled.\n\nHow it works\n\nThe following are the flow steps that the Google app and your app take when\nApp Flip occurs:\n\n1. The Google app attempts to open your app's universal link. It's able to\n open your app if it's installed on the user's device and associated with\n the universal link. See [Supporting Universal Links](https://developer.apple.com/documentation/uikit/inter-process_communication/allowing_apps_and_websites_to_link_to_your_content) for details.\n\n2. Your app checks that the `client_id` and `redirect_uri` parameter encoded\n in the incoming URL matches the expected Google universal link.\n\n3. Your app requests an authorization code from your OAuth2 server. At the end\n of this flow, your app returns either an authorization code or an error to\n the Google app. To do this, it opens Google's universal link with appended\n parameters for the authorization code or error.\n\n4. The Google app handles the incoming Google universal link and continues with\n the rest of the flow. If an authorization code is provided, the linking is\n completed immediately. The token exchange happens server-to-server, the same\n way it does in the browser-based OAuth linking flow. If an error code is\n returned, the linking flow continues with the alternative options.\n\nModify your iOS app to support App Flip\n\nTo support App Flip, make the following code changes to your iOS app:\n\n1. Handle `NSUserActivityTypeBrowsingWeb` in your App Delegate.\n2. Capture `redirect_uri` and `state` parameters from the URL to use later.\n3. Check that `redirect_uri` matches this format: \n\n ```\n https://oauth-redirect.googleusercontent.com/a/GOOGLE_APP_BUNDLE_ID\n https://oauth-redirect-sandbox.googleusercontent.com/a/GOOGLE_APP_BUNDLE_ID\n ```\n4. Verify that the client ID matches the expected value. Use the following\n code sample:\n\n func application(_ application: UIApplication,\n continue userActivity: NSUserActivity,\n restorationHandler: @escaping ([Any]?) -\u003e Void) -\u003e Bool\n {\n guard userActivity.activityType == NSUserActivityTypeBrowsingWeb,\n let incomingURL = userActivity.webpageURL,\n let components = URLComponents(url: incomingURL, resolvingAgainstBaseURL: false),\n let params = components.queryItems else {\n return false\n }\n\n if let clientId = params.filter({$0.name == \"client_id\"}).first?.value,\n let state = params.filter({$0.name == \"state\"}).first?.value,\n let redirectUri = params.filter({$0.name == \"redirect_uri\"}).first?.value {\n\n // Save the redirect_uri and state for later...\n\n // Verify the client id\n return (clientId == GOOGLE_CLIENT_ID)\n } else {\n // Missing required parameters\n return false\n }\n }\n\n5. Upon successful authorization, call the redirect URI with the authorization\n code. Use the following code sample:\n\n func returnAuthCode(code: String, state: String, redirectUri: String) {\n var redirectURL = URL(string: redirectUri)\n var components = URLComponents(url: redirectURL, resolvingAgainstBaseURL: false)\n\n // Return the authorization code and original state\n let paramAuthCode = URLQueryItem(name: \"code\", value: code)\n let paramState = URLQueryItem(name: \"state\", value: state)\n components?.queryItems = [paramAuthCode, paramState]\n if let resultURL = components?.url {\n UIApplication.shared.open(\n resultURL,\n options: [UIApplicationOpenURLOptionUniversalLinksOnly : true],\n completionHandler: nil)\n }\n }\n\n6. If an error occurred, attach an error result to the redirect URI instead.\n Use the following code sample:\n\n **Note:** Do not handle the error directly within your app, instead return the error result to the `REDIRECT_URL`. This ensures that the appropriate fallback method is trigerred if the app linking flow fails. \n\n func returnError(redirectUri: String) {\n var redirectURL = URL(string: redirectUri)\n var components = URLComponents(url: redirectURL, resolvingAgainstBaseURL: false)\n\n // Return the authorization code and original state\n let paramError = URLQueryItem(name: \"error\", value: \"invalid_request\")\n let paramDescription = URLQueryItem(name: \"error_description\", value: \"Invalid Request\")\n components?.queryItems = [paramError, paramDescription]\n if let resultURL = components?.url {\n UIApplication.shared.open(\n resultURL,\n options: [UIApplicationOpenURLOptionUniversalLinksOnly : true],\n completionHandler: nil)\n }\n }\n\nQuery parameters for your app's universal link\n\nWhen opened by the Google app, your app's universal link includes the following\nquery parameters:\n\n- `client_id` (`String`): Google `client_id` that's registered under your app.\n- `scope` (`List of String`): A list of space-separated scopes requested.\n- `state` (`String`): A nonce used by Google to verify that the authorization result is in response to Google's outgoing request.\n- `redirect_uri` (`String`): Google's universal link. The \"flip\" URI to open the Google app and pass results.\n\nQuery parameters for Google's universal link\n\nParameters used when the authorization result is returned successfully:\n\n- `code` (`String`): The value of the authorization code, if available.\n- `state` (`String`): The exact value received from the incoming universal link.\n\nParameters used when the authorization result is returned unsuccessfully:\n\n- `error` (`String`), with the following values:\n\n - `cancelled`: A recoverable error. The Google app will attempt account linking using the authorization URL. Some examples are the user failing to sign in, a device being offline or a connection timing out.\n - `unrecoverable`: An unrecoverable error. For example, the user attempts to link with a disabled account.The Google app will abort account linking.\n - `invalid_request`: The request parameters are invalid or missing. This is a recoverable error. The Google app will attempt account linking using the authorization URL.\n - `access_denied`: The user rejects the consent request. This is a non-recoverable error; the Google app aborts linking.\n- `error_description` (`String`, optional): A user-friendly error message.\n\n | **Note:** For more information on [possible errors](https://www.oauth.com/oauth2-servers/server-side-apps/possible-errors/) and the optional contents of the `error_description` field, see the OAuth 2.0 standard.\n\nFor all error types, you must return the response data to the specified\n`REDIRECT_URI` to ensure the appropriate fallback is trigerred.\n\nModify your authorization endpoint to support App Flip\n\nConfigure your platform to accept requests using Google's App Flip redirect URLs:\n\n- Google Home app \n\n ```\n https://oauth-redirect.googleusercontent.com/a/com.google.Chromecast.dev\n https://oauth-redirect.googleusercontent.com/a/com.google.Chromecast.enterprise\n https://oauth-redirect.googleusercontent.com/a/com.google.Chromecast\n https://oauth-redirect-sandbox.googleusercontent.com/a/com.google.Chromecast.dev\n https://oauth-redirect-sandbox.googleusercontent.com/a/com.google.Chromecast.enterprise\n https://oauth-redirect-sandbox.googleusercontent.com/a/com.google.Chromecast\n ```\n- Google Assistant app \n\n ```\n https://oauth-redirect.googleusercontent.com/a/com.google.OPA.dev\n https://oauth-redirect.googleusercontent.com/a/com.google.OPA.enterprise\n https://oauth-redirect.googleusercontent.com/a/com.google.OPA\n https://oauth-redirect-sandbox.googleusercontent.com/a/com.google.OPA.dev\n https://oauth-redirect-sandbox.googleusercontent.com/a/com.google.OPA.enterprise\n https://oauth-redirect-sandbox.googleusercontent.com/a/com.google.OPA\n ```\n\nCheck that `client_id` and the URL specified by the `redirect_uri` parameter\nmatch the expected values when a request is received. if the client verification\nfails, return the error `invalid_request` to the `redirect_uri`."]]
