Dialogflow easy way for authorization

Question

Does exist an easy way to connect Dialogflow agent to node.js code? When I use this code with the correct projectID taken from the Dialogflow agent's settings page, I have the following error:

Error: Unexpected error while acquiring application default credentials: Could not load the default credentials. Browse to https://developers.google.com/accounts/docs/application-default-credentials for more information.

const sessionClient = new dialogflow.SessionsClient();
const sessionPath = sessionClient.sessionPath(projectId, sessionId);

I visited the page, but for what I want I think is quite confused (they quotes other API and a lot of setting), how can I solve this?

I want to take informations from a file and loading all without installing third party APIs.

Answer 1

I am writing the code, which worked for me. Please follow all the steps provided in Reference link 2 and for coding purpose you can use the snippet provided.

I have also added the sample JSON of Google Cloud Oauth

References:

1. https://www.npmjs.com/package/dialogflow#samples
2. https://medium.com/@tzahi/how-to-setup-dialogflow-v2-authentication-programmatically-with-node-js-b37fa4815d89

//Downloaded JSON format

{
  "type": "service_account",
  "project_id": "mybot",
  "private_key_id": "123456asd",
  "private_key": "YOURKEY",
  "client_email": "[email protected]",
  "client_id": "098091234",
  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
  "token_uri": "https://oauth2.googleapis.com/token",
  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/yourID%40mybot.iam.gserviceaccount.com"
}


//------*********************---------------------------
//
const projectId = 'mybot';

//https://dialogflow.com/docs/agents#settings
// generate session id (currently hard coded)
const sessionId = '981dbc33-7c54-5419-2cce-edf90efd2170';
const query = 'hello';
const languageCode = 'en-US';

// Instantiate a DialogFlow client.
const dialogflow = require('dialogflow');
let privateKey = 'YourKey';

// as per goolgle json
let clientEmail = "[email protected]";
let config = {
  credentials: {
    private_key: privateKey,
    client_email: clientEmail
  }
}
const sessionClient = new dialogflow.SessionsClient(config);

// Define session path
const sessionPath = sessionClient.sessionPath(projectId, sessionId);

// The text query request.
const request = {
  session: sessionPath,
  queryInput: {
    text: {
      text: query,
      languageCode: languageCode,
    },
  },
};

// Send request and log result
sessionClient
  .detectIntent(request)
  .then(responses => {
    console.log('Detected intent');
    const result = responses[0].queryResult;
    console.log(`  Query: ${result.queryText}`);
    console.log(`  Response: ${result.fulfillmentText}`);
    if (result.intent) {
      console.log(`  Intent: ${result.intent.displayName}`);
    } else {
      console.log(`  No intent matched.`);
    }
  })
  .catch(err => {
    console.error('ERROR:', err);
  });