91 lines
2.7 KiB
JavaScript
91 lines
2.7 KiB
JavaScript
const fs = require('fs').promises;
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const path = require('path');
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const process = require('process');
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const {authenticate} = require('@google-cloud/local-auth');
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const {google} = require('googleapis');
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// If modifying these scopes, delete token.json.
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const SCOPES = ['https://www.googleapis.com/auth/spreadsheets.readonly'];
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// The file token.json stores the user's access and refresh tokens, and is
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// created automatically when the authorization flow completes for the first
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// time.
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const TOKEN_PATH = path.join(process.cwd(), 'token.json');
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const CREDENTIALS_PATH = path.join(process.cwd(), 'credentials.json');
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/**
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* Reads previously authorized credentials from the save file.
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*
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* @return {Promise<OAuth2Client|null>}
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*/
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async function loadSavedCredentialsIfExist() {
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try {
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const content = await fs.readFile(TOKEN_PATH);
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const credentials = JSON.parse(content);
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return google.auth.fromJSON(credentials);
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} catch (err) {
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return null;
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}
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}
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/**
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* Serializes credentials to a file compatible with GoogleAuth.fromJSON.
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*
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* @param {OAuth2Client} client
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* @return {Promise<void>}
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*/
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async function saveCredentials(client) {
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const content = await fs.readFile(CREDENTIALS_PATH);
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const keys = JSON.parse(content);
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const key = keys.installed || keys.web;
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const payload = JSON.stringify({
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type: 'authorized_user',
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client_id: key.client_id,
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client_secret: key.client_secret,
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refresh_token: client.credentials.refresh_token,
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});
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await fs.writeFile(TOKEN_PATH, payload);
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}
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/**
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* Load or request or authorization to call APIs.
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*
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*/
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async function authorize() {
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let client = await loadSavedCredentialsIfExist();
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if (client) {
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return client;
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}
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client = await authenticate({
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scopes: SCOPES,
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keyfilePath: CREDENTIALS_PATH,
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});
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if (client.credentials) {
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await saveCredentials(client);
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}
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return client;
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}
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/**
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* Prints the names and majors of students in a sample spreadsheet:
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* @see https://docs.google.com/spreadsheets/d/1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms/edit
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* @param {google.auth.OAuth2} auth The authenticated Google OAuth client.
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*/
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async function listMajors(auth) {
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const sheets = google.sheets({version: 'v4', auth});
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const res = await sheets.spreadsheets.values.get({
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spreadsheetId: '1BxiMVs0XRA5nFMdKvBdBZjgmUUqptlbs74OgvE2upms',
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range: 'Class Data!A2:E',
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});
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const rows = res.data.values;
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if (!rows || rows.length === 0) {
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console.log('No data found.');
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return;
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}
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console.log('Name, Major:');
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rows.forEach((row) => {
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// Print columns A and E, which correspond to indices 0 and 4.
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console.log(`${row[0]}, ${row[4]}`);
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});
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}
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authorize().then(listMajors).catch(console.error); |