TypeError：无法读取未定义的属性“client_secret”

Question

我正在尝试按照 Google 的 Node API 访问 gmail here。

以node quickstart.js 运行他们的示例快速入门时，我收到以下错误：

TypeError: Cannot read property 'client_secret' of undefined
    at authorize (/home/user/example/quickstart.js:32:43)
    at processClientSecrets (/home/example/bstick/quickstart.js:21:3)
    at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:439:3)

• 我已下载密钥并将其重命名为client_secret.json，并将其复制到quickstart.js 的工作目录中
• node --version = 7.8.0，package.json 有 "google-auth-library": "^0.10.0", "googleapis": "^19.0.0"

源代码（谷歌的例子）：

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/gmail-nodejs-quickstart.json
var SCOPES = ['https://www.googleapis.com/auth/gmail.readonly'];
var TOKEN_DIR = (process.env.HOME || process.env.HOMEPATH ||
    process.env.USERPROFILE) + '/.credentials/';
var TOKEN_PATH = TOKEN_DIR + 'gmail-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
  // Gmail API.
  authorize(JSON.parse(content), listLabels);
});

/**
 * 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 labels in the user's account.
 *
 * @param {google.auth.OAuth2} auth An authorized OAuth2 client.
 */
function listLabels(auth) {
  var gmail = google.gmail('v1');
  gmail.users.labels.list({
    auth: auth,
    userId: 'me',
  }, function(err, response) {
    if (err) {
      console.log('The API returned an error: ' + err);
      return;
    }
    var labels = response.labels;
    if (labels.length == 0) {
      console.log('No labels found.');
    } else {
      console.log('Labels:');
      for (var i = 0; i < labels.length; i++) {
        var label = labels[i];
        console.log('- %s', label.name);
      }
    }
  });
}

Answer 1

您在生成凭据时似乎必须选择 OAuth 以外的其他内容。

所以按照步骤 你的配置文件应该是这样的

{"installed": //whatever

但是如果你选择Web，那么你的配置文件会是这样的

{"web":{ //whatever

所以打开您的配置文件并根据该更改此行。

  var clientSecret = credentials.installed.client_secret;
//it should be credentials.whatever-key.client_secret.
//Example : If its web then this line should be credentials.web.client_secret.

Answer 2

2020 更新： “其他”应用程序类型不再存在。但是“桌面”选项提供了相同的结果。

Answer 3

您要么生成了错误类型的凭据（请参阅 Parth Ghiya 的回答），要么选择了错误类型的应用程序。

执行以下操作：

1. 转到https://console.developers.google.com/apis/credentials
   然后点击Create credentials按钮。
2. 选择OAuth client ID 选项
3. 选择应用程序类型：Other
   （不是Web application！）
4. 为其命名并单击Create
5. 关闭弹出窗口（显示客户端 ID 和客户端密码）
6. 在OAuth 2.0 客户端 ID 列表中单击您新创建的凭据上的下载图标
7. 将下载的.json文件移动到你的项目文件夹中
8. 将文件重命名为client_secret.json
9. 运行node quickstart.js

你应该很高兴。