類型錯誤：無法讀取的不確定

Question

我試圖效仿谷歌的節點API訪問Gmail here財產「client_secret」。

當運行他們的樣品快速入門爲node quickstart.js，我提示以下錯誤：

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) 

• 我已經下載了鑰匙，並更名爲client_secret.json，並將其複製到的quickstart.js
• node --version工作目錄= 7.8.0，package.json有"google-auth-library": "^0.10.0", "googleapis": "^19.0.0"

的源代碼（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

看來你必須選定了OAuth的其他東西，而產生的憑據。

所以按步驟 您的配置文件應該是這樣的

{"installed": //whatever 

但如果U選擇網絡，那麼你的配置文件看起來像這樣

{"web":{ //whatever 

所以打開你的配置文件&根據這個改變這一行。

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

您生成了錯誤的憑證類型（請參見Parth Ghiya的回答）或選擇了錯誤的應用程序類型。

執行以下操作：

1. 轉到https://console.developers.google.com/apis/credentials
   並單擊Create credentials按鈕。
2. 選擇OAuth client ID選項
3. 選擇應用程序類型：Other
   （！不Web application）
4. 給它一個名稱，然後單擊Create
5. 關閉彈出窗口（這表明用戶端編號和密碼）
6. 點擊下載圖標在您剛創建的證書在的OAuth 2.0客戶端ID列表
7. 下載以.json文件移動到項目文件夾
8. 的文件重命名爲client_secret.json
9. 運行node quickstart.js

你應該是好去。