我正在尝试使用node.js从google驱动器下载文件。这是我第一次尝试使用google sdks，所以我只是按照说明操作并复制了示例中的代码。我可以成功地从我的gdrive中存在的文件中获取元数据，但每当我尝试下载文件时，都会抛出错误。请在下面找到我正在使用的代码片段，它只是文档中提供的示例。
var fs = require('fs');
var readline = require('readline');
var google = require('googleapis');
var googleAuth = require('google-auth-library');
var request = require("request");
// If modifying these scopes, delete your previously saved credentials
// at ~/.credentials/drive-nodejs-quickstart.json
//var SCOPES = ['https://www.googleapis.com/auth/drive.metadata.readonly'];
var SCOPES = ['https://www.googleapis.com/auth/drive'];
/* var TOKEN_DIR = (process.env.HOME || process.env.HOMEPATH ||
process.env.USERPROFILE) + '/.credentials/'; */
var TOKEN_DIR = process.env.USERPROFILE + '/.credentials/';
var TOKEN_PATH = TOKEN_DIR + 'drive-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
// Drive API.
authorize(JSON.parse(content), listFiles);
});
/**
* 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 listFiles(auth) {
var service = google.drive('v3');
service.files.list({
auth: auth,
pageSize: 10,
fields: "nextPageToken, files(id, name)"
}, function(err, response) {
if (err) {
console.log('The API returned an error: ' + err);
return;
}
var files = response.files;
if (files.length == 0) {
console.log('No files found.');
} else {
for (var i = 0; i < files.length; i++) {
var file = files[i];
if(file.name.indexOf('Expense') > -1) {
downloadFile(file.id);
}
}
}
});
}
/**
* Download a file's content.
*
* @param {File} file Drive File instance.
* @param {Function} callback Function to call when the request is complete.
*/
function downloadFile(fileId) {
//file['exportLinks']['application/pdf'];
//var fileId = '0BwwA4oUTeiV1UVNwOHItT0xfa2M';
var service = google.drive('v3');
var dest = fs.createWriteStream('/test.doc');
service.files.get({
fileId: fileId,
alt: 'media'
})
.on('end', function() {
console.log('Done');
})
.on('error', function(err) {
console.log('Error during download', err);
})
.pipe(dest);
}
我在过去一小时内只尝试了17-20个请求，并且我认为我没有使用过所有配额。我已经检查过我的项目中启用了GDrive api。请帮忙。
答案 0 :(得分：0)
根据此documentation，错误403表示您已达到Google Drive API的最高请求率。限制因请求的类型而异。建议的操作是Batch the requests。尽量减少客户端必须进行的HTTP连接数量。
另一种解决方法是在开发者控制台中查看Google+ API的状态。它应该设置为ON。打开后等待几分钟，确保获得新的令牌。
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