Vinculación de cuentas con OAuth y Acceso con Google (Dialogflow)

El tipo de vinculación OAuth y Acceso con Google agrega el Acceso con Google además del acceso basado en OAuth vinculación de cuentas. Esto proporciona un vínculo basado en la voz sin inconvenientes para los usuarios de Google. y, al mismo tiempo, habilitar la vinculación de cuentas para los usuarios que se registraron en tu servicio con una identidad ajena a Google.

Este tipo de vinculación comienza con el Acceso con Google, que te permite verificar si el La información del perfil de Google ya existe en tu sistema. Si la información del usuario no se encuentra en tu sistema, se inicia un flujo estándar de OAuth. El usuario también puede elige crear una cuenta nueva con la información de su perfil de Google.

Figura 1: Después de que la acción obtiene acceso al perfil de Google del usuario puedes usarlo para encontrar una coincidencia del usuario en tu sistema de autenticación.

Para vincular las cuentas con OAuth y el Acceso con Google, sigue estas indicaciones generales pasos:

  1. En primer lugar, solicita al usuario que dé su consentimiento para acceder a su perfil de Google.
  2. Utilizar la información de su perfil para identificar al usuario
  3. Si no encuentras una coincidencia para el usuario de Google en tu sistema de autenticación, el flujo procede dependiendo de si configuraste tu proyecto de acciones en la Consola de Actions para permitir la creación de cuentas de usuario por voz o solo tu sitio web.
    • Si permites la creación de cuentas mediante la voz, valida el ID token recibido de Google. Luego, puedes crear un usuario basado en el la información de perfil contenida en el token de ID.
    • Si no permites la creación de cuentas mediante la voz, se transferirá al usuario a un navegador donde puedan cargar su página de autorización y completar la de tu flujo de creación.
Si permites la creación de cuentas mediante la voz y no encuentras una coincidencia para
            el perfil de Google en tu sistema de autenticación, debes
            validar el token de ID que se recibió de Google. Luego, puedes crear
            usuario según la información de perfil que se encuentra en el token de ID.
            Si no permites la creación de cuentas de usuario con la voz,
            transferirse a un navegador donde puedan cargar la página de autorización
            y completar el flujo.
Figura 2: Una representación visual de los componentes de OAuth y de Google Flujo de acceso cuando no se encuentra la información de un usuario en tu sistema.

Compatibilidad con la creación de cuentas mediante comandos de voz

Si permites la creación de cuentas de usuario con la voz, Asistente le preguntará al usuario si quieren hacer lo siguiente:

  • Crear una cuenta nueva en tu sistema con la información de su Cuenta de Google
  • Accede a tu sistema de autenticación con una cuenta diferente si tiene una una cuenta existente que no es de Google.

Te recomendamos que permitas la creación de cuentas por voz si deseas minimizar el en el flujo de creación de la cuenta. El usuario solo debe salir del flujo de voz. si quiere acceder con una cuenta que no es de Google.

No permitir la creación de cuentas por voz

Si inhabilitaste la creación de cuentas de usuario por voz, el Asistente abrirá la URL en que proporcionaste para la autenticación de usuarios. Si la interacción ocurre En un dispositivo que no tiene pantalla, el Asistente dirige al usuario a un teléfono para continuar con el flujo de vinculación de cuentas.

Se recomienda inhabilitar la creación en los siguientes casos:

  • No quieres permitir que los usuarios que tienen cuentas ajenas a Google creen una cuenta nueva usuario existente y quieres que se vinculen a sus cuentas de usuario existentes en tu de autenticación de la organización. Por ejemplo, si ofreces un programa de lealtad, puede asegurarse de que el usuario no pierda los puntos acumulados con una cuenta existente.

  • Debes tener el control total del flujo de creación de la cuenta. Por ejemplo, podrías inhabilitar la creación si necesitas mostrar tus condiciones del servicio al usuario durante la creación de una cuenta.

.

Implementa la vinculación de cuentas de OAuth y Acceso con Google

Las cuentas están vinculadas con flujos de OAuth 2.0 estándar de la industria. Actions on Google admite los flujos de código implícito y de autorización.

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.

Configura el proyecto

Para configurar tu proyecto de modo que use OAuth y cuentas de Acceso con Google la vinculación, sigue estos pasos:

  1. Abre la Consola de Actions y selecciona el proyecto que deseas usar.
  2. Haz clic en la pestaña Desarrollar y selecciona Vinculación de cuentas.
  3. Habilita el interruptor junto a Vinculación de cuentas.
  4. En la sección Creación de la cuenta, selecciona .

  5. En Tipo de vinculación, selecciona OAuth & Acceso con Google e Implícito.

  6. En Client Information, haz lo siguiente:

    • Asigna un valor al ID de cliente emitido por tus acciones a Google para identificarlo. solicitudes provenientes de Google.
    • Inserta las URLs para los extremos de autorización y intercambio de tokens.
  7. Haz clic en Guardar.

Implementa tu servidor de OAuth

To support the OAuth 2.0 implicit flow, your service makes an authorization endpoint available by HTTPS. This endpoint is responsible for authenticating and 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.

When your Action needs to call one of your service's authorized APIs, Google uses this endpoint to get permission from your users to call these APIs on their behalf.

A typical OAuth 2.0 implicit flow session initiated by Google has the following flow:

  1. Google opens your authorization endpoint in the user's browser. 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.
  2. Your service creates an access token and returns it to Google by redirecting the user's browser back to Google with the access token attached to the request.
  3. Google calls your service's APIs, and attaches the access token with each request. Your service verifies that the access token grants Google authorization to access the API and then completes the API call.

Handle authorization requests

When your Action needs to perform account linking via an OAuth2 implicit 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.
response_type The type of value to return in the response. For the OAuth 2.0 implicit flow, the response type is always token.

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&response_type=token

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

  1. Verify the client_id and redirect_uri values to prevent granting access to unintended or misconfigured client apps:

    • Confirm that the client_id matches the client ID you assigned to Google.
    • 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.
  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 access token that Google will use to access your API. The access token can be any string value, but it must uniquely represent the user and the client the token is for and must not be guessable.

  4. Send an HTTP response that redirects the user's browser to the URL specified by the redirect_uri parameter. Include all of the following parameters in the URL fragment:

    • access_token: the access token you just generated
    • token_type: the string bearer
    • state: the unmodified state value from the original request The following is an example of the resulting URL:
      https://oauth-redirect.googleusercontent.com/r/YOUR_PROJECT_ID#access_token=ACCESS_TOKEN&token_type=bearer&state=STATE_STRING

Google's OAuth 2.0 redirect handler will receive the access token and confirm that the state value hasn't changed. After Google has obtained an access token for your service, Google will attach the token to subsequent calls to your Action as part of the AppRequest.

Handle automatic linking

After the user gives your Action consent to access their Google profile, Google sends a request that contains a signed assertion of the Google user's identity. The assertion contains information that includes the user's Google Account ID, name, and email address. The token exchange endpoint configured for your project handles that request.

If the corresponding Google account is already present in your authentication system, your token exchange endpoint returns a token for the user. If the Google account doesn't match an existing user, your token exchange endpoint returns a user_not_found error.

The request has the following form:

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

grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer&intent=get&assertion=JWT&consent_code=CONSENT_CODE&scope=SCOPES

Your token exchange endpoint must be able to handle the following parameters:

Token endpoint parameters
grant_type The type of token being exchanged. For these requests, this parameter has the value urn:ietf:params:oauth:grant-type:jwt-bearer.
intent For these requests, the value of this parameter is `get`.
assertion A JSON Web Token (JWT) that provides a signed assertion of the Google user's identity. The JWT contains information that includes the user's Google Account ID, name, and email address.
consent_code Optional: When present, a one-time code that indicates that the user has granted consent for your Action to access the specified scopes.
scope Optional: Any scopes you configured Google to request from users.

When your token exchange endpoint receives the linking request, it should do the following:

Validate and decode the JWT assertion

You can validate and decode the JWT assertion by using a JWT-decoding library for your language. Use Google's public keys (available in JWK or PEM format) to verify the token's signature.

When decoded, the JWT assertion looks like the following example:

{
  "sub": 1234567890,        // The unique ID of the user's Google Account
  "iss": "https://accounts.google.com",        // The assertion's issuer
  "aud": "123-abc.apps.googleusercontent.com", // Your server's client ID
  "iat": 233366400,         // Unix timestamp of the assertion's creation time
  "exp": 233370000,         // Unix timestamp of the assertion's expiration time
  "name": "Jan Jansen",
  "given_name": "Jan",
  "family_name": "Jansen",
  "email": "jan@gmail.com", // If present, the user's email address
  "locale": "en_US"
}

In addition to verifying the token's signature, verify that the assertion's issuer (iss field) is https://accounts.google.com and that the audience (aud field) is the client ID assigned to your Action.

Check if the Google account is already present in your authentication system

Check whether either of the following conditions are true:

  • The Google Account ID, found in the assertion's sub field, is in your user database.
  • The email address in the assertion matches a user in your user database.

If either condition is true, the user has already signed up and you can issue an access token.

If neither the Google Account ID nor the email address specified in the assertion matches a user in your database, the user hasn't signed up yet. In this case, your token exchange endpoint should reply with a HTTP 401 error, that specifies error=user_not_found, as in the following example:

HTTP/1.1 401 Unauthorized
Content-Type: application/json;charset=UTF-8

{
  "error":"user_not_found",
}
When Google receives the 401 error response with a user_not_found error, Google calls your token exchange endpoint with the value of the intent parameter set to create and sending an ID token that contains the user's profile information with the request.

Handle account creation via Google Sign-In

When a user needs to create an account on your service, Google makes a request to your token exchange endpoint that specifies intent=create, as in the following example:

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

response_type=token&grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer&scope=SCOPES&intent=create&consent_code=CONSENT_CODE&assertion=JWT[&NEW_ACCOUNT_INFO]

The assertion parameter contains A JSON Web Token (JWT) that provides a signed assertion of the Google user's identity. The JWT contains information that includes the user's Google Account ID, name, and email address, which you can use to create a new account on your service.

To respond to account creation requests, your token exchange endpoint must do the following:

Validate and decode the JWT assertion

You can validate and decode the JWT assertion by using a JWT-decoding library for your language. Use Google's public keys (available in JWK or PEM format) to verify the token's signature.

When decoded, the JWT assertion looks like the following example:

{
  "sub": 1234567890,        // The unique ID of the user's Google Account
  "iss": "https://accounts.google.com",        // The assertion's issuer
  "aud": "123-abc.apps.googleusercontent.com", // Your server's client ID
  "iat": 233366400,         // Unix timestamp of the assertion's creation time
  "exp": 233370000,         // Unix timestamp of the assertion's expiration time
  "name": "Jan Jansen",
  "given_name": "Jan",
  "family_name": "Jansen",
  "email": "jan@gmail.com", // If present, the user's email address
  "locale": "en_US"
}

In addition to verifying the token's signature, verify that the assertion's issuer (iss field) is https://accounts.google.com and that the audience (aud field) is the client ID assigned to your Action.

Validate user information and create new account

Check whether either of the following conditions are true:

  • The Google Account ID, found in the assertion's sub field, is in your user database.
  • The email address in the assertion matches a user in your user database.

If either condition is true, prompt the user to link their existing account with their Google Account by responding to the request with an HTTP 401 error, specifying error=linking_error and the user's email address as the login_hint, as in the following example:

HTTP/1.1 401 Unauthorized
Content-Type: application/json;charset=UTF-8

{
  "error":"linking_error",
  "login_hint":"foo@bar.com"
}

If neither condition is true, create a new user account using the information provided in the JWT. New accounts do not typically have a password set. It is recommended that you add Google Sign In to other platforms to enable users to log in via Google across the surfaces of your application. Alternatively, you can email the user a link that starts your password recovery flow to allow the user to set a password for signing in on other platforms.

When the creation is completed, issue an access token and return the values in a JSON object in the body of your HTTPS response, like in the following example:

{
  "token_type": "Bearer",
  "access_token": "ACCESS_TOKEN",
  
  "expires_in": SECONDS_TO_EXPIRATION
}

Inicia el flujo de autenticación

Usa el intent del asistente para el acceso a la cuenta para iniciar el flujo de autenticación.

Dialogflow (Node.js)
const app = dialogflow({
  // REPLACE THE PLACEHOLDER WITH THE CLIENT_ID OF YOUR ACTIONS PROJECT
  clientId: CLIENT_ID,
})

// Intent that starts the account linking flow.
app.intent('Start Signin', conv => {
  conv.ask(new SignIn('To get your account details'))
})
.
.
Dialogflow (Java)
private String clientId = "<your_client_id>";

@ForIntent("Start Signin")
public ActionResponse text(ActionRequest request) {
  ResponseBuilder rb = getResponseBuilder(request);
  return rb.add(new SignIn().setContext("To get your account details")).build();
}
.
.
SDK de Actions (Node.js)
const app = actionssdk({
  clientId: CLIENT_ID,
})

app.intent('Start Signin', conv => {
  conv.ask(new SignIn('To get your account details'))
})
.
.
SDK de Actions (Java)
private String clientId = "<your_client_id>";

@ForIntent("actions.intent.TEXT")
public ActionResponse text(ActionRequest request) {
  ResponseBuilder rb = getResponseBuilder(request);
  return rb.add(new SignIn().setContext("To get your account details")).build();
}

Maneja solicitudes de acceso a los datos

Si la solicitud del Asistente contiene un token de acceso, Comprueba primero que el token de acceso sea válido y no haya vencido, y luego recupéralo desde tu base de datos de la cuenta de usuario, la cuenta de usuario asociada con el token.