从谷歌驱动 API 获取图像 [英] Get images from google drive API

问题描述

我正在使用 node.js 尝试从我的谷歌驱动器中获取图像.我已经完成了入门并尝试使用下载将其放入文件中.我的代码显示我成功下载了它，但我看不到文件的图像.我对 API 还很陌生.我只想获取我的图像并能够将其渲染到我的页面以供查看.任何帮助将不胜感激.

I am using node.js to try and get the images out of my google drive. I’ve finished the the getting started and tried to use download to put it in a file. My code is showing that I successfully downloaded it but I can’t see the image the file. I’m fairly new to API’s. I just want to get my image and be able to render it to my page to be viewed. Any help would be very appreciated.

const express = require("express");
const path = require ("path");
const bodyParser = require("body-parser");
const ejs = require("ejs");
const app = express();
app.use(express.static(path.join(__dirname, 'public')));



// Google getting started section
const fs = require('fs');
const readline = require('readline');
const {google} = require('googleapis');

// If modifying these scopes, delete token.json.
const SCOPES = ['https://www.googleapis.com/auth/drive.readonly',
                               'https://www.googleapis.com/auth/drive.metadata.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 = 'token.json';

// Load client secrets from a local file.
fs.readFile('credentials.json', (err, content) => {
  if (err) return console.log('Error loading client secret file:', err);
  // Authorize a client with credentials, then call the Google Drive API.
  authorize(JSON.parse(content), listFiles,downloadFile);
});

/**
 * 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) {
  const {client_secret, client_id, redirect_uris} = credentials.installed;
  const oAuth2Client = new google.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) return getAccessToken(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.
 */
function getAccessToken(oAuth2Client, callback) {
  const authUrl = oAuth2Client.generateAuthUrl({
    access_type: 'offline',
    scope: SCOPES,
  });
  console.log('Authorize this app by visiting this url:', authUrl);
  const rl = 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) return console.error('Error retrieving access token', err);
      oAuth2Client.setCredentials(token);
      // Store the token to disk for later program executions
      fs.writeFile(TOKEN_PATH, JSON.stringify(token), (err) => {
        if (err) return console.error(err);
        console.log('Token stored to', TOKEN_PATH);
      });
      callback(oAuth2Client);
    });
  });
}

/**
 * Lists the names and IDs of up to 10 files.
 * @param {google.auth.OAuth2} auth An authorized OAuth2 client.
 */
function listFiles(auth) {
  const drive = google.drive({version: 'v3', auth});

  drive.files.list({
    pageSize: 10,
    fields: 'nextPageToken, files(id, name)',
  }, (err, res) => {
    if (err) return console.log('The API returned an error: ' + err);
    const files = res.data.files;
    if (files.length) {

      console.log('Files:');
      files.map((file) => {

        downloadFile(auth);

      });
    } else {
      console.log('No files found.');
    }
  });
}

// download to local file  
function downloadFile(auth) {const drive = google.drive({version: "v3", 
  auth});
 var fileId = "######";

 var dest = fs.createWriteStream("public/images/photo.jpg");

 drive.files.get({fileId: fileId, alt: "media"}, {responseType: "stream"},
 function(err, res){
    res.data
    .on("end", () => {

    })
    .on("error", err => {
       console.log("Error", err);
    })
    .pipe(dest);

// I am geeting success but I cant find the Image
    console.log("success");
 });
}

推荐答案

不确定这是否能解决问题，但我的猜测是问题在于将文件写入的path.代码本身似乎直接来自 API 文档，并且似乎是正确的.

Not sure if this will solve the issue, but my guess is that the problem is the path where to write the file to. The code itself seems to come straight from the API docs, and seems to be correct.

基于官方文档，相对路径以斜线 (/).

Based on the official documentation, relative paths start with a slash (/).

所以尝试改变这个:

var dest = fs.createWriteStream("public/images/photo.jpg");

有了这个:

var dest = fs.createWriteStream("/public/images/photo.jpg");

参考:

• Node.js:文件系统 > 文件路径

这篇关于从谷歌驱动 API 获取图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！