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index.js
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index.js
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/**
* Copyright 2022 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* eslint-disable camelcase */
// [START docs_quickstart]
const fs = require('fs').promises;
const path = require('path');
const process = require('process');
const {authenticate} = require('@google-cloud/local-auth');
const {google} = require('googleapis');
// If modifying these scopes, delete token.json.
const SCOPES = ['https://www.googleapis.com/auth/documents.readonly'];
// The file token.json stores the user's access and refresh tokens, and is
// created automatically when the authorization flow completes for the first
// time.
const TOKEN_PATH = path.join(process.cwd(), 'token.json');
const CREDENTIALS_PATH = path.join(process.cwd(), 'credentials.json');
/**
* Reads previously authorized credentials from the save file.
*
* @return {Promise<OAuth2Client|null>}
*/
async function loadSavedCredentialsIfExist() {
try {
const content = await fs.readFile(TOKEN_PATH);
const credentials = JSON.parse(content);
return google.auth.fromJSON(credentials);
} catch (err) {
return null;
}
}
/**
* Serializes credentials to a file compatible with GoogleAuth.fromJSON.
*
* @param {OAuth2Client} client
* @return {Promise<void>}
*/
async function saveCredentials(client) {
const content = await fs.readFile(CREDENTIALS_PATH);
const keys = JSON.parse(content);
const key = keys.installed || keys.web;
const payload = JSON.stringify({
type: 'authorized_user',
client_id: key.client_id,
client_secret: key.client_secret,
refresh_token: client.credentials.refresh_token,
});
await fs.writeFile(TOKEN_PATH, payload);
}
/**
* Load or request or authorization to call APIs.
*
*/
async function authorize() {
let client = await loadSavedCredentialsIfExist();
if (client) {
return client;
}
client = await authenticate({
scopes: SCOPES,
keyfilePath: CREDENTIALS_PATH,
});
if (client.credentials) {
await saveCredentials(client);
}
return client;
}
/**
* Prints the title of a sample doc:
* https://docs.google.com/document/d/195j9eDD3ccgjQRttHhJPymLJUCOUjs-jmwTrekvdjFE/edit
* @param {google.auth.OAuth2} auth The authenticated Google OAuth 2.0 client.
*/
async function printDocTitle(auth) {
const docs = google.docs({version: 'v1', auth});
const res = await docs.documents.get({
documentId: '195j9eDD3ccgjQRttHhJPymLJUCOUjs-jmwTrekvdjFE',
});
console.log(`The title of the document is: ${res.data.title}`);
}
authorize().then(printDocTitle).catch(console.error);
// [END docs_quickstart]