OAuth ile hesap bağlama

OAuth bağlama türü, sektör standardı olan iki OAuth 2.0 akışını (örtük ve yetkilendirme kod akışı) destekler.

In the implicit code 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 the Assistant to your Action.

In the authorization code flow, you need two endpoints:

  • The authorization endpoint, which is responsible for presenting the sign-in UI to your users that aren't already signed in and recording consent to the requested access in the form of a short-lived authorization code.
  • 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.

Although the implicit code flow is simpler to implement, Google recommends that access tokens issued using the implicit flow never expire, because using token expiration with the implicit flow forces the user to link their account again. If you need token expiration for security reasons, you should strongly consider using the auth code flow instead.

OAuth hesap bağlamayı uygulayın

Projeyi yapılandırma

Projenizi OAuth bağlantısını kullanacak şekilde yapılandırmak için aşağıdaki adımları uygulayın:

  1. Actions Console'u açın ve kullanmak istediğiniz projeyi seçin.
  2. Geliştirme sekmesini tıklayın ve Hesap bağlama'yı seçin.
  3. Hesap bağlama'nın yanındaki anahtarı etkinleştirin.
  4. Hesap oluşturma bölümünde Hayır, yalnızca web sitemde hesap oluşturulmasına izin vermek istiyorum'u seçin.
  5. Bağlantı türü bölümünde OAuth ve Yetkilendirme kodu seçeneklerini belirleyin.

  6. Müşteri Bilgileri bölümünde:

    • Google'dan gelen istekleri tanımlamak için Actions to Google'a (İşlemleriniz tarafından Google'a gönderilen) bir değer atayın.
    • Google tarafından İşlemlerinize verilen istemci kimliğinin değerini not edin;
    • Yetkilendirme ve Jeton Değişimi uç noktalarınızın URL'lerini ekleyin.
  1. Kaydet'i tıklayın.

OAuth sunucunuzu uygulama

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 the Action user to access your service.

When your Action 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.

OAuth 2.0 auth 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 would transfer 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 by redirecting 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 the Assistant to your fulfillment webhook contains an access token.

Handle authorization requests

When your Action needs to perform account linking via an 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 Google client ID you registered with 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 string code.

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

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

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

  1. Verify that the client_id matches the Google client ID you registered with 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 that Google will 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
    YOUR_PROJECT_ID is the ID found on the Project settings page of the Actions Console.

  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. Either authorization_code or refresh_token.
code When grant_type=authorization_code, 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, 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 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 the following:
    • The authorization code is valid and not expired, and the client ID specified in the request matches the client ID associated with the authorization code.
    • The URL specified by the redirect_uri parameter is identical to the value used in the initial authorization request.
  3. If you cannot verify all of the above criteria, return an HTTP 400 Bad Request error with {"error": "invalid_grant"} as the body.
  4. Otherwise, using the user ID from the authorization code, 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 (typically an hour after you issue the token). Refresh tokens do not expire.
  5. 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 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 cannot 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
    }

Kimlik doğrulama akışı için ses kullanıcı arayüzünü tasarlama

Kullanıcının doğrulanıp doğrulanmadığını kontrol etme ve hesap bağlama akışını başlatma

  1. Actions Console'da Actions Builder projenizi açın.
  2. İşleminizde hesap bağlamayı başlatmak için yeni bir sahne oluşturun:
    1. Sahneler'i tıklayın.
    2. Yeni bir sahne eklemek için ekle (+) simgesini tıklayın.
  3. Yeni oluşturulan sahnede Koşullar için ekle simgesini tıklayın.
  4. Görüşmeyle ilişkilendirilen kullanıcının doğrulanmış bir kullanıcı olup olmadığını kontrol eden bir koşul ekleyin. Kontrol başarısız olursa İşleminiz görüşme sırasında hesap bağlama işlemi gerçekleştiremez ve hesap bağlamayı gerektirmeyen işlevlere erişim sağlamaya devam etmelidir.
    1. Koşul bölümündeki Enter new expression alanına aşağıdaki mantığı girin: user.verificationStatus != "VERIFIED"
    2. Geçiş bölümünde, hesap bağlama gerektirmeyen bir düzen veya yalnızca konuklara özel işleve giriş noktası olan bir düzen seçin.

  1. Koşullar için ekle simgesini tıklayın.
  2. Kullanıcının ilişkili bir kimliği yoksa hesap bağlama akışını tetiklemek için bir koşul ekleyin.
    1. Koşul bölümündeki Enter new expression alanına aşağıdaki mantığı girin: user.verificationStatus == "VERIFIED"
    2. Geçiş bölümünde, Hesap Bağlama sistem sahnesini seçin.
    3. Kaydet'i tıklayın.

Kaydettikten sonra projenize <SceneName>_AccountLinking adlı yeni bir hesap bağlama sistemi düzeni eklenir.

Hesap bağlama sahnesini özelleştirin

  1. Sahneler bölümünde, hesap bağlama sistemi sahnesini seçin.
  2. İstem gönder'i tıklayın ve işlemin neden kimliğine erişmesi gerektiğini kullanıcıya açıklamak için kısa bir cümle ekleyin (örneğin, "Tercihlerinizi kaydetmek için").
  3. Kaydet'i tıklayın.

  1. Koşullar bölümünde, Kullanıcı hesap bağlamayı başarıyla tamamlarsa'yı tıklayın.
  2. Kullanıcı, hesabını bağlamayı kabul ederse akışın nasıl devam edeceğini yapılandırın. Örneğin, gerekli olan özel iş mantığını işlemesi ve kaynak sahneye geri dönmesi için webhook'u çağırın.
  3. Kaydet'i tıklayın.

  1. Koşullar bölümünde, Kullanıcı hesap bağlamayı iptal eder veya reddederse'yi tıklayın.
  2. Kullanıcı, hesabını bağlamayı kabul etmezse akışın nasıl devam edeceğini yapılandırın. Örneğin, onaylama mesajı gönderin ve kullanıcıları, hesap bağlamayı gerektirmeyen işlevler sunan sahnelere yönlendirin.
  3. Kaydet'i tıklayın.

  1. Koşullar bölümünde, Sistem veya ağ hatası oluşursa'yı tıklayın.
  2. Hesap bağlama akışı sistem veya ağ hataları nedeniyle tamamlanamıyorsa akışın nasıl devam edeceğini yapılandırın. Örneğin, onaylama mesajı gönderin ve kullanıcıları, hesap bağlamayı gerektirmeyen işlevler sunan sahnelere yönlendirin.
  3. Kaydet'i tıklayın.

Veri erişim isteklerini işleme

Asistan isteği erişim jetonu içeriyorsa öncelikle erişim jetonunun geçerli olduğundan (ve süresinin dolmamış olduğundan) emin olun, ardından veritabanınızdan ilişkili kullanıcı hesabını alın.