Add file for coming-soon node.js quickstart guide.

youtube · Apr 25, 2017 · 954f7e0 · 954f7e0
1 parent 47c49fe
commit 954f7e0
Showing 1 changed file with 124 additions and 0 deletions.
diff --git a/javascript/nodejs-quickstart.js b/javascript/nodejs-quickstart.js
@@ -0,0 +1,124 @@
+var fs = require('fs');
+var readline = require('readline');
+var google = require('googleapis');
+var googleAuth = require('google-auth-library');
+
+// If modifying these scopes, delete your previously saved credentials
+// at ~/.credentials/youtube-nodejs-quickstart.json
+var SCOPES = ['https://www.googleapis.com/auth/youtube.readonly'];
+var TOKEN_DIR = (process.env.HOME || process.env.HOMEPATH ||
+ process.env.USERPROFILE) + '/.credentials/';
+var TOKEN_PATH = TOKEN_DIR + 'youtube-nodejs-quickstart.json';
+
+// Load client secrets from a local file.
+fs.readFile('client_secret.json', function processClientSecrets(err, content) {
+ if (err) {
+ console.log('Error loading client secret file: ' + err);
+ return;
+ }
+ // Authorize a client with the loaded credentials, then call the YouTube API.
+ authorize(JSON.parse(content), getChannel);
+});
+
+/**
+ * Create an OAuth2 client with the given credentials, and then execute the
+ * given callback function.
+ *
+ * @param {Object} credentials The authorization client credentials.
+ * @param {function} callback The callback to call with the authorized client.
+ */
+function authorize(credentials, callback) {
+ var clientSecret = credentials.installed.client_secret;
+ var clientId = credentials.installed.client_id;
+ var redirectUrl = credentials.installed.redirect_uris[0];
+ var auth = new googleAuth();
+ var oauth2Client = new auth.OAuth2(clientId, clientSecret, redirectUrl);
+
+ // Check if we have previously stored a token.
+ fs.readFile(TOKEN_PATH, function(err, token) {
+ if (err) {
+ getNewToken(oauth2Client, callback);
+ } else {
+ oauth2Client.credentials = JSON.parse(token);
+ callback(oauth2Client);
+ }
+ });
+}
+
+/**
+ * Get and store new token after prompting for user authorization, and then
+ * execute the given callback with the authorized OAuth2 client.
+ *
+ * @param {google.auth.OAuth2} oauth2Client The OAuth2 client to get token for.
+ * @param {getEventsCallback} callback The callback to call with the authorized
+ * client.
+ */
+function getNewToken(oauth2Client, callback) {
+ var authUrl = oauth2Client.generateAuthUrl({
+ access_type: 'offline',
+ scope: SCOPES
+ });
+ console.log('Authorize this app by visiting this url: ', authUrl);
+ var rl = readline.createInterface({
+ input: process.stdin,
+ output: process.stdout
+ });
+ rl.question('Enter the code from that page here: ', function(code) {
+ rl.close();
+ oauth2Client.getToken(code, function(err, token) {
+ if (err) {
+ console.log('Error while trying to retrieve access token', err);
+ return;
+ }
+ oauth2Client.credentials = token;
+ storeToken(token);
+ callback(oauth2Client);
+ });
+ });
+}
+
+/**
+ * Store token to disk be used in later program executions.
+ *
+ * @param {Object} token The token to store to disk.
+ */
+function storeToken(token) {
+ try {
+ fs.mkdirSync(TOKEN_DIR);
+ } catch (err) {
+ if (err.code != 'EEXIST') {
+ throw err;
+ }
+ }
+ fs.writeFile(TOKEN_PATH, JSON.stringify(token));
+ console.log('Token stored to ' + TOKEN_PATH);
+}
+
+/**
+ * Lists the names and IDs of up to 10 files.
+ *
+ * @param {google.auth.OAuth2} auth An authorized OAuth2 client.
+ */
+function getChannel(auth) {
+ var service = google.youtube('v3');
+ service.channels.list({
+ auth: auth,
+ part: 'snippet,contentDetails,statistics',
+ forUsername: 'GoogleDevelopers'
+ }, function(err, response) {
+ if (err) {
+ console.log('The API returned an error: ' + err);
+ return;
+ }
+ var channels = response.items;
+ if (channels.length == 0) {
+ console.log('No channel found.');
+ } else {
+ console.log('This channel\'s ID is %s. Its title is \'%s\', and ' +
+ 'it has %s views.',
+ channels[0].id,
+ channels[0].snippet.title,
+ channels[0].statistics.viewCount);
+ }
+ });
+}