ربط حساب Google باستخدام OAuth

ويتم ربط الحسابات باستخدام مساري OAuth 2.0 الضمني ورمز التفويض القياسي في المجال. يجب أن تتوافق خدمتك مع نقاط نهاية التفويض والتبادل المميز المتوافقة مع OAuth 2.0.

In the implicit flow, Google opens your authorization endpoint in the user's browser. After successful sign in, you return a long-lived access token to Google. This access token is now included in every request sent from Google.

In the authorization code flow, you need two endpoints:

  • The authorization endpoint, which presents the sign-in UI to your users that aren't already signed in. The authorization endpoint also creates a short-lived authorization code to record users' consent to the requested access.

  • The token exchange endpoint, which is responsible for two types of exchanges:

    1. Exchanges an authorization code for a long-lived refresh token and a short-lived access token. This exchange happens when the user goes through the account linking flow.
    2. Exchanges a long-lived refresh token for a short-lived access token. This exchange happens when Google needs a new access token because the one it had expired.

Choose an OAuth 2.0 flow

Although the implicit flow is simpler to implement, Google recommends that access tokens issued by the implicit flow never expire. This is because the user is forced to link their account again after a token expires with the implicit flow. If you need token expiration for security reasons, we strongly recommend that you use the authorization code flow instead.

Design guidelines

This section describes the design requirements and recommendations for the user screen that you host for OAuth linking flows. After it's called by Google's app, your platform displays a sign in to Google page and account linking consent screen to the user. The user is directed back to Google's app after giving their consent to link accounts.

This figure shows the steps for a user to link their Google account to your authentication system. The first screenshot shows user-initiated linking from your platform. The second image shows user sign-in to Google, while the third shows the user consent and confirmation for linking their Google account with your app. The final screenshot shows a successfully linked user account in the Google app.
Figure 1. Account linking user sign in to Google and consent screens.

Requirements

  1. You must communicate that the user’s account will be linked to Google, not a specific Google product like Google Home or Google Assistant.

Recommendations

We recommend that you do the following:

  1. Display Google's Privacy Policy. Include a link to Google’s Privacy Policy on the consent screen.

  2. Data to be shared. Use clear and concise language to tell the user what data of theirs Google requires and why.

  3. Clear call-to-action. State a clear call-to-action on your consent screen, such as “Agree and link.” This is because users need to understand what data they're required to share with Google to link their accounts.

  4. Ability to cancel. Provide a way for users to go back or cancel, if they choose not to link.

  5. Clear sign-in process. Ensure that users have clear method for signing in to their Google account, such as fields for their username and password or Sign in with Google.

  6. Ability to unlink. Offer a mechanism for users to unlink, such as a URL to their account settings on your platform. Alternatively, you can include a link to Google Account where users can manage their linked account.

  7. Ability to change user account. Suggest a method for users to switch their account(s). This is especially beneficial if users tend to have multiple accounts.

    • If a user must close the consent screen to switch accounts, send a recoverable error to Google so the user can sign in to the desired account with OAuth linking and the implicit flow.

  8. Include your logo. Display your company logo on the consent screen. Use your style guidelines to place your logo. If you wish to also display Google's logo, see Logos and trademarks.

Create the project

To create your project to use account linking:

  1. Go to the Google API Console.
  2. انقر فوق إنشاء مشروع .
  3. أدخل اسمًا أو اقبل الاقتراح الذي تم إنشاؤه.
  4. قم بتأكيد أو تحرير أي حقول متبقية.
  5. انقر فوق إنشاء .

لعرض معرف المشروع الخاص بك:

  1. Go to the Google API Console.
  2. ابحث عن مشروعك في الجدول على الصفحة المقصودة. يظهر معرف المشروع في عمود المعرف .

The Google Account Linking process includes a consent screen which tells users the application requesting access to their data, what kind of data they are asking for and the terms that apply. You will need to configure your OAuth consent screen before generating a Google API client ID.

  1. Open the OAuth consent screen page of the Google APIs console.
  2. If prompted, select the project you just created.

  3. On the "OAuth consent screen" page, fill out the form and click the “Save” button.

    Application name: The name of the application asking for consent. The name should accurately reflect your application and be consistent with the application name users see elsewhere. The application name will be shown on the Account Linking consent screen.

    Application logo: An image on the consent screen that will help users recognize your app. The logo is shown on Account linking consent screen and on account settings

    Support email: For users to contact you with questions about their consent.

    Scopes for Google APIs: Scopes allow your application to access your user's private Google data. For the Google Account Linking use case, default scope (email, profile, openid) is sufficient, you don’t need to add any sensitive scopes. It is generally a best practice to request scopes incrementally, at the time access is required, rather than up front. Learn more.

    Authorized domains: To protect you and your users, Google only allows applications that authenticate using OAuth to use Authorized Domains. Your applications' links must be hosted on Authorized Domains. Learn more.

    Application Homepage link: Home page for your application. Must be hosted on an Authorized Domain.

    Application Privacy Policy link: Shown on Google Account Linking consent screen. Must be hosted on an Authorized Domain.

    Application Terms of Service link (Optional): Must be hosted on an Authorized Domain.

    Figure 1. Google Account Linking Consent Screen for a fictitious Application, Tunery

  4. Check "Verification Status", if your application needs verification then click the "Submit For Verification" button to submit your application for verification. Refer to OAuth verification requirements for details.

تنفيذ خادم OAuth

An OAuth 2.0 server implementation of the authorization code flow consists of two endpoints, which your service makes available by HTTPS. The first endpoint is the authorization endpoint, which is responsible for finding or obtaining consent from users for data access. The authorization endpoint presents a sign-in UI to your users that aren't already signed in and records consent to the requested access. The second endpoint is the token exchange endpoint, which is used to obtain encrypted strings, called tokens, that authorize a user to access your service.

When a Google application needs to call one of your service's APIs, Google uses these endpoints together to get permission from your users to call these APIs on their behalf.

An OAuth 2.0 authorization code flow session initiated by Google has the following flow:

  1. Google opens your authorization endpoint in the user's browser. If the flow started on a voice-only device for an Action, Google transfers the execution to a phone.
  2. The user signs in, if not signed in already, and grants Google permission to access their data with your API, if they haven't already granted permission.
  3. Your service creates an authorization code and returns it to Google. To do so, redirect the user's browser back to Google with the authorization code attached to the request.
  4. Google sends the authorization code to your token exchange endpoint, which verifies the authenticity of the code and returns an access token and a refresh token. The access token is a short-lived token that your service accepts as credentials to access APIs. The refresh token is a long-lived token that Google can store and use to acquire new access tokens when they expire.
  5. After the user has completed the account linking flow, every subsequent request sent from Google contains an access token.

Handle authorization requests

When you need to perform account linking using the OAuth 2.0 authorization code flow, Google sends the user to your authorization endpoint with a request that includes the following parameters:

Authorization endpoint parameters
client_id The Client ID you assigned to Google.
redirect_uri The URL to which you send the response to this request.
state A bookkeeping value that is passed back to Google unchanged in the redirect URI.
scope Optional: A space-delimited set of scope strings that specify the data Google is requesting authorization for.
response_type The type of value to return in the response. For the OAuth 2.0 authorization code flow, the response type is always code.
user_locale The Google Account language setting in RFC5646 format, used to localize your content in the user's preferred language.

For example, if your authorization endpoint is available at https://myservice.example.com/auth, a request might look like the following:

GET https://myservice.example.com/auth?client_id=GOOGLE_CLIENT_ID&redirect_uri=REDIRECT_URI&state=STATE_STRING&scope=REQUESTED_SCOPES&response_type=code&user_locale=LOCALE

For your authorization endpoint to handle sign-in requests, do the following steps:

  1. Verify that the client_id matches the Client ID you assigned to Google, and that the redirect_uri matches the redirect URL provided by Google for your service. These checks are important to prevent granting access to unintended or misconfigured client apps. If you support multiple OAuth 2.0 flows, also confirm that the response_type is code.
  2. Check if the user is signed in to your service. If the user isn't signed in, complete your service's sign-in or sign-up flow.
  3. Generate an authorization code for Google to use to access your API. The authorization code can be any string value, but it must uniquely represent the user, the client the token is for, and the code's expiration time, and it must not be guessable. You typically issue authorization codes that expire after approximately 10 minutes.
  4. Confirm that the URL specified by the redirect_uri parameter has the following form: 
      https://oauth-redirect.googleusercontent.com/r/YOUR_PROJECT_ID
  https://oauth-redirect-sandbox.googleusercontent.com/r/YOUR_PROJECT_ID
  5. Redirect the user's browser to the URL specified by the redirect_uri parameter. Include the authorization code you just generated and the original, unmodified state value when you redirect by appending the code and state parameters. The following is an example of the resulting URL: 
    https://oauth-redirect.googleusercontent.com/r/YOUR_PROJECT_ID?code=AUTHORIZATION_CODE&state=STATE_STRING

Handle token exchange requests

Your service's token exchange endpoint is responsible for two kinds of token exchanges:

  • Exchange authorization codes for access tokens and refresh tokens
  • Exchange refresh tokens for access tokens

Token exchange requests include the following parameters:

Token exchange endpoint parameters
client_id A string that identifies the request origin as Google. This string must be registered within your system as Google's unique identifier.
client_secret A secret string that you registered with Google for your service.
grant_type The type of token being exchanged. It's either authorization_code or refresh_token.
code When grant_type=authorization_code, this parameter is the code Google received from either your sign-in or token exchange endpoint.
redirect_uri When grant_type=authorization_code, this parameter is the URL used in the initial authorization request.
refresh_token When grant_type=refresh_token, this parameter is the refresh token Google received from your token exchange endpoint.
Exchange authorization codes for access tokens and refresh tokens

After the user signs in and your authorization endpoint returns a short-lived authorization code to Google, Google sends a request to your token exchange endpoint to exchange the authorization code for an access token and a refresh token.

For these requests, the value of grant_type is authorization_code, and the value of code is the value of the authorization code you previously granted to Google. The following is an example of a request to exchange an authorization code for an access token and a refresh token:

POST /token HTTP/1.1
Host: oauth2.example.com
Content-Type: application/x-www-form-urlencoded

client_id=GOOGLE_CLIENT_ID&client_secret=GOOGLE_CLIENT_SECRET&grant_type=authorization_code&code=AUTHORIZATION_CODE&redirect_uri=REDIRECT_URI

To exchange authorization codes for an access token and a refresh token, your token exchange endpoint responds to POST requests by executing the following steps:

  1. Verify that the client_id identifies the request origin as an authorized origin, and that the client_secret matches the expected value.
  2. Verify that the authorization code is valid and not expired, and that the client ID specified in the request matches the client ID associated with the authorization code.
  3. Confirm that the URL specified by the redirect_uri parameter is identical to the value used in the initial authorization request.
  4. If you can't verify all of the above criteria, return an HTTP 400 Bad Request error with {"error": "invalid_grant"} as the body.
  5. Otherwise, use the user ID from the authorization code to generate a refresh token and an access token. These tokens can be any string value, but they must uniquely represent the user and the client the token is for, and they must not be guessable. For access tokens, also record the expiration time of the token, which is typically an hour after you issue the token. Refresh tokens don't expire.
  6. Return the following JSON object in the body of the HTTPS response: 
    {
"token_type": "Bearer",
"access_token": "ACCESS_TOKEN",
"refresh_token": "REFRESH_TOKEN",
"expires_in": SECONDS_TO_EXPIRATION
}

Google stores the access token and the refresh token for the user and records the expiration of the access token. When the access token expires, Google uses the refresh token to get a new access token from your token exchange endpoint.

Exchange refresh tokens for access tokens

When an access token expires, Google sends a request to your token exchange endpoint to exchange a refresh token for a new access token.

For these requests, the value of grant_type is refresh_token, and the value of refresh_token is the value of the refresh token you previously granted to Google. The following is an example of a request to exchange a refresh token for an access token:

POST /token HTTP/1.1
Host: oauth2.example.com
Content-Type: application/x-www-form-urlencoded

client_id=GOOGLE_CLIENT_ID&client_secret=GOOGLE_CLIENT_SECRET&grant_type=refresh_token&refresh_token=REFRESH_TOKEN

To exchange a refresh token for an access token, your token exchange endpoint responds to POST requests by executing the following steps:

  1. Verify that the client_id identifies the request origin as Google, and that the client_secret matches the expected value.
  2. Verify that the refresh token is valid, and that the client ID specified in the request matches the client ID associated with the refresh token.
  3. If you can't verify all of the above criteria, return an HTTP 400 Bad Request error with {"error": "invalid_grant"} as the body.
  4. Otherwise, use the user ID from the refresh token to generate an access token. These tokens can be any string value, but they must uniquely represent the user and the client the token is for, and they must not be guessable. For access tokens, also record the expiration time of the token, typically an hour after you issue the token.
  5. Return the following JSON object in the body of the HTTPS response: 
    {
"token_type": "Bearer",
"access_token": "ACCESS_TOKEN",
"expires_in": SECONDS_TO_EXPIRATION
}
التعامل مع طلبات معلومات المستخدم

و نقطة النهاية المعلومات حول المستخدم موردا محمية أوث 2.0 المطالبات عودة عن المستخدم المرتبطة. يعد تنفيذ واستضافة نقطة نهاية معلومات المستخدم أمرًا اختياريًا ، باستثناء حالات الاستخدام التالية:

بعد أن يتم استرداد رمز الوصول بنجاح من نقطة نهاية الرمز المميز ، ترسل Google طلبًا إلى نقطة نهاية معلومات المستخدم الخاصة بك لاسترداد معلومات الملف الشخصي الأساسية حول المستخدم المرتبط.

رؤوس طلب نقطة نهاية userinfo
Authorization header رمز الوصول من نوع Bearer.

على سبيل المثال، إذا كان لديك المعلومات حول المستخدم نقطة النهاية هي متوفرة في https://myservice.example.com/userinfo ، قد طلب تبدو كما يلي:

GET /userinfo HTTP/1.1
Host: myservice.example.com
Authorization: Bearer ACCESS_TOKEN

لكي تتعامل نقطة نهاية معلومات المستخدم مع الطلبات ، قم بالخطوات التالية:

  1. استخراج رمز الوصول من رأس التفويض وإرجاع المعلومات للمستخدم المرتبط برمز الوصول.
  2. إذا كان رمز وصول غير صالح، بإرجاع خطأ غير مصرح HTTP 401 مع استخدام WWW-Authenticate رأس استجابة. وفيما يلي مثال على استجابة خطأ المعلومات حول المستخدم:
    HTTP/1.1 401 Unauthorized
WWW-Authenticate: error="invalid_token",
error_description="The Access Token expired"
    إذا 401 يتم إرجاع غير مصرح بها، أو أي استجابة خطأ فاشلة أخرى خلال عملية الربط، سوف يكون من الخطأ غير قابل للاسترداد، سيتم تجاهل الرموز التي تم استردادها وسيكون المستخدم لبدء عملية الربط مرة أخرى.

  3. إذا كان رمز وصول غير صالحة، وعودة وHTTP 200 استجابة مع كائن JSON التالية في الجسم للاستجابة HTTPS: 

    {
"sub": "USER_UUID",
"email": "EMAIL_ADDRESS",
"given_name": "FIRST_NAME",
"family_name": "LAST_NAME",
"name": "FULL_NAME",
"picture": "PROFILE_PICTURE",
}
    إذا كان لديك المعلومات حول المستخدم نقطة النهاية عوائد استجابة نجاح HTTP 200، واسترجاع رمز ويتم تسجيل الدعاوى المرفوعة ضد جوجل الخاص بالمستخدم الحساب.

    استجابة نقطة نهاية userinfo
    sub معرّف فريد يعرّف المستخدم في نظامك.
    email عنوان البريد الإلكتروني للمستخدم.
    given_name اختياري: الاسم الأول للمستخدم.
    family_name اختياري: اسم العائلة للمستخدم.
    name اختياري: الاسم الكامل للمستخدم.
    picture اختياري: الصورة الشخصية للمستخدم.

التحقّق من صحة عملية التنفيذ

يمكنك التحقق من صحة التطبيق الخاص بك باستخدام ملعب أوث 2.0 الأداة.

في الأداة ، قم بالخطوات التالية:

  1. انقر فوق تكوين لفتح نافذة تكوين أوث 2.0.
  2. في مجال تدفق أوث، اختر من جانب العميل.
  3. في مجال أوث النهايات، حدد مخصص.
  4. حدد نقطة نهاية OAuth 2.0 ومعرف العميل الذي عينته لـ Google في الحقول المقابلة.
  5. في القسم الخطوة 1، لا تحدد أي نطاقات جوجل. بدلاً من ذلك ، اترك هذا الحقل فارغًا أو اكتب نطاقًا صالحًا لخادمك (أو سلسلة عشوائية إذا كنت لا تستخدم نطاقات OAuth). عند الانتهاء من ذلك، انقر فوق تخويل واجهات برمجة التطبيقات.
  6. في الأقسام الخطوة 2 و الخطوة 3، انتقل من خلال تدفق أوث 2.0 والتحقق من أن كل خطوة تعمل على النحو المنشود.

يمكنك التحقق من صحة التطبيق الخاص بك باستخدام حساب Google ربط تجريبي الأداة.

في الأداة ، قم بالخطوات التالية:

  1. انقر على تسجيل الدخول باستخدام زر جوجل.
  2. اختر الحساب الذي ترغب في ربطه.
  3. أدخل معرف الخدمة.
  4. اختياريًا ، أدخل نطاقًا واحدًا أو أكثر ستطلب الوصول إليه.
  5. انقر فوق ابدأ تجريبي.
  6. عند المطالبة ، أكد أنه يمكنك الموافقة ورفض طلب الربط.
  7. تأكد من إعادة توجيهك إلى النظام الأساسي الخاص بك.