Node.jsでGoogle Slides APIを触ってみる

$ mkdir slidesapitest
$ cd slidesapitest

$ npm init -y$ npm i googleapis@39

$ touch app.js

constfs=require('fs');constreadline=require('readline');const{google}=require('googleapis');// If modifying these scopes, delete token.json.constSCOPES=['https://www.googleapis.com/auth/presentations.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.constTOKEN_PATH='token.json';// Load client secrets from a local file.fs.readFile('credentials.json',(err,content)=>{if(err)returnconsole.log('Error loading client secret file:',err);// Authorize a client with credentials, then call the Google Slides API.authorize(JSON.parse(content),listSlides);});/**
 * 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.
 */functionauthorize(credentials,callback){const{client_secret,client_id,redirect_uris}=credentials.installed;constoAuth2Client=newgoogle.auth.OAuth2(client_id,client_secret,redirect_uris[0]);// Check if we have previously stored a token.fs.readFile(TOKEN_PATH,(err,token)=>{if(err)returngetNewToken(oAuth2Client,callback);oAuth2Client.setCredentials(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 for the authorized client.
 */functiongetNewToken(oAuth2Client,callback){constauthUrl=oAuth2Client.generateAuthUrl({access_type:'offline',scope:SCOPES,});console.log('Authorize this app by visiting this url:',authUrl);constrl=readline.createInterface({input:process.stdin,output:process.stdout,});rl.question('Enter the code from that page here: ',(code)=>{rl.close();oAuth2Client.getToken(code,(err,token)=>{if(err)returnconsole.error('Error retrieving access token',err);oAuth2Client.setCredentials(token);// Store the token to disk for later program executionsfs.writeFile(TOKEN_PATH,JSON.stringify(token),(err)=>{if(err)returnconsole.error(err);console.log('Token stored to',TOKEN_PATH);});callback(oAuth2Client);});});}/**
 * Prints the number of slides and elements in a sample presentation:
 * https://docs.google.com/presentation/d/1EAYk18WDjIG-zp_0vLm3CsfQh_i8eXc67Jo2O9C6Vuc/edit
 * @param {google.auth.OAuth2} auth The authenticated Google OAuth client.
 */functionlistSlides(auth){constslides=google.slides({version:'v1',auth});slides.presentations.get({presentationId:'1EAYk18WDjIG-zp_0vLm3CsfQh_i8eXc67Jo2O9C6Vuc',},(err,res)=>{if(err)returnconsole.log('The API returned an error: '+err);constlength=res.data.slides.length;console.log('The presentation contains %s slides:',length);res.data.slides.map((slide,i)=>{console.log(`- Slide #${i+1} contains ${slide.pageElements.length} elements.`);});});}

$ node app.js

Authorize this app by visiting this url: https://accounts.google.com/o/oauth2/v2/auth?access_type=offline&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fpresentations.readonly&response_type=code&client_id=xxxxxxxxxxxx.apps.googleusercontent.com&redirect_uri=urn%3Aietf%3Awg%3Aoauth%3A2.0%3Aoob
Enter the code from that page here: <ここにコードをペースト>

Token stored to token.json
The presentation contains 5 slides:
- Slide #1 contains 4 elements.
- Slide #2 contains 11 elements.
- Slide #3 contains 9 elements.
- Slide #4 contains 5 elements.
- Slide #5 contains 12 elements.

//省略slides.presentations.get({presentationId:'1EAYk18WDjIG-zp_0vLm3CsfQh_i8eXc67Jo2O9C6Vuc',}//省略

The presentation contains 5 slides:
- Slide #1 contains 4 elements.
- Slide #2 contains 11 elements.
- Slide #3 contains 9 elements.
- Slide #4 contains 5 elements.
- Slide #5 contains 12 elements.