Vinculação de contas com o OAuth (Dialogflow)

O tipo de vinculação OAuth é compatível com dois fluxos do OAuth 2.0 padrão do setor, o implícito e fluxos de código de autorização.

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.

Note: Please choose which OAuth2 flow you want to implement. If needed, the content of this guide reloads to adapt to your choice.

Auth code Implicit flow

Implementar a vinculação de conta OAuth

Observação :se você estiver implementando a vinculação de contas para gerenciar informações financeiras, outras políticas podem ser aplicadas à sua Ação. Isso pode levar até seis semanas para analisar uma ação com vinculação de contas para conseguir informações financeiras. considere esse tempo ao planejar sua programação de lançamentos. Para facilitar a revisão siga as políticas de serviços financeiros. antes de enviar sua Ação para revisão.

Configurar o projeto

Para configurar seu projeto para usar a vinculação de conta OAuth, siga estas etapas:

1. Abra o Console do Actions e selecione o projeto que você quer usar.
2. Clique na guia Desenvolver e escolha Vinculação de contas.
3. Ative a chave ao lado de Vinculação de contas.
4. Na seção Criação de conta, selecione Não, só quero permitir a criação de contas no meu site.

5. Em Tipo de vinculação, selecione OAuth e Implícito.

   

6. Em Informações do cliente:

   • Atribua um valor ao ID do cliente emitido pelas suas ações para o Google para identificar solicitações vindas do Google.
   • Insira os URLs dos endpoints de autorização e de troca de token.

.

Observação :se você quiser que seu ID do cliente seja enviado como um formato codificado em base64 string, clique na seta suspensa ao lado de Configure your client (optional) e marque a caixa Google to transmit clientID and secret via HTTP Basic cabeçalho de autenticação.

6. Clique em Salvar.

Implementar seu servidor 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.

Iniciar o fluxo de autenticação

Aviso: não envie aos usuários uma solicitação de vinculação de conta no início da conversa com sua ação. Em vez disso, forneça um fluxo de convidado aos usuários não autenticados para mostrar como sua ação funciona e só peça a vinculação de contas se for necessário continuar. Se os usuários estiverem saindo da ação com frequência por causa de problemas com a vinculação da conta, o Google não a promoverá ativamente, o que pode diminuir o tráfego de usuários dela.

usar a intent do Assistente de login da conta; para iniciar o fluxo de autenticação. Os snippets de código a seguir descrevem como envie uma resposta no Dialogflow e no SDK do Actions para usar este auxiliar.

Dialogflow:

Node.js

.

const {dialogflow, SignIn} = require('actions-on-google');
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'));
});

Java

.

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

JSON

{
  "payload": {
    "google": {
      "expectUserResponse": true,
      "richResponse": {
        "items": [
          {
            "simpleResponse": {
              "textToSpeech": "PLACEHOLDER"
            }
          }
        ]
      },
      "userStorage": "{\"data\":{}}",
      "systemIntent": {
        "intent": "actions.intent.SIGN_IN",
        "data": {
          "@type": "type.googleapis.com/google.actions.v2.SignInValueSpec",
          "optContext": "To get your account details"
        }
      }
    }
  },
  "outputContexts": [
    {
      "name": "/contexts/_actions_on_google",
      "lifespanCount": 99,
      "parameters": {
        "data": "{}"
      }
    }
  ]
}

SDK do Actions:

Node.js

.

const {actionssdk, SignIn} = require('actions-on-google');
const app = actionssdk({
  // REPLACE THE PLACEHOLDER WITH THE CLIENT_ID OF YOUR ACTIONS PROJECT
  clientId: CLIENT_ID,
});
// Intent that starts the account linking flow.
app.intent('actions.intent.TEXT', (conv) => {
  conv.ask(new SignIn('To get your account details'));
});

Java

.

@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();
}

JSON

{
  "expectUserResponse": true,
  "expectedInputs": [
    {
      "inputPrompt": {
        "richInitialPrompt": {
          "items": [
            {
              "simpleResponse": {
                "textToSpeech": "PLACEHOLDER"
              }
            }
          ]
        }
      },
      "possibleIntents": [
        {
          "intent": "actions.intent.SIGN_IN",
          "inputValueData": {
            "@type": "type.googleapis.com/google.actions.v2.SignInValueSpec",
            "optContext": "To get your account details"
          }
        }
      ]
    }
  ],
  "conversationToken": "{\"data\":{}}",
  "userStorage": "{\"data\":{}}"
}

Processar solicitações de acesso a dados

Se a solicitação do Assistente tiver um token de acesso, faça o seguinte: verifique primeiro se o token de acesso é válido (e não expirado) e, em seguida, recupere a conta de usuário associada do seu banco de dados.