带有 Google 云打印的 OAuth2

Question

我写了一个 Google Apps 脚本连接到 Google Cloud Print 来自动化一些打印。该脚本会按时间间隔自动运行，搜索相关文件，如果找到，它会将它们发送到我的打印机。我的代码使用 OAuthConfig 并且运行良好，但现在 class 已被弃用，经过一个周末的反复试验和搜索互联网后，我 不能'它无法与 OAuth2 一起使用。

这是工作正常的 OAuthConfig 代码：

function printDoc(docId, docTitle, myPrinterId) {

  var scope = 'https://www.googleapis.com/auth/cloudprint';
  var url = 'https://www.google.com/cloudprint/submit'; 
  var payloadOfSubmit = {
    "printerid" : myPrinterId, 
    "title" : docTitle,
    "content"  : docId, 
    "contentType" : "google.kix"  
  };

  var fetchArgs = googleOAuth_('google', scope, payloadOfSubmit); 
  fetchArgs.method = 'POST';
  var responseOfSubmit = UrlFetchApp.fetch(url, fetchArgs);
  var jsonOfSubmit = JSON.parse(responseOfSubmit.getContentText()); 

  return jsonOfSubmit;
}

function googleOAuth_(name, scope, payloadData) {
  var oAuthConfig = UrlFetchApp.addOAuthService(name);
  oAuthConfig.setAuthorizationUrl("https://www.google.com/accounts/OAuthAuthorizeToken");
  oAuthConfig.setRequestTokenUrl("https://www.google.com/accounts/OAuthGetRequestToken?scope="+scope);
  oAuthConfig.setAccessTokenUrl("https://www.google.com/accounts/OAuthGetAccessToken");
  oAuthConfig.setConsumerKey("anonymous");
  oAuthConfig.setConsumerSecret("anonymous");
  return {
    oAuthServiceName:name, 
    oAuthUseToken:"always", 
    muteHttpExceptions:true, 
    payload:payloadData
  }; 
}

我已成功连接 github library for OAuth2。但是，那里提供的说明与许多其他网站上的说明不同的是，它们假设代码将部署为 Web 服务，提示用户手动单击以授权请求。在我的例子中，代码将保存在 Google Apps 脚本文件中，并且云打印机在同一个 Google 帐户中，所以我从来不需要这种手动干预或来回使用我的原始 OAuthconfig。

我调整说明的第一次尝试是：

function printDoc2(docId, docTitle, myPrinterId) {

  var url = 'https://www.google.com/cloudprint/submit';
  var scope = 'https://www.googleapis.com/auth/cloudprint'; 
  var payloadOfSubmit = {
    "printerid" : myPrinterId, 
    "title" : docTitle,
    "content"  : docId, 
    "contentType" : "google.kix",
  };

  var accessToken = googleOAuth_('google', scope).getAccessToken();

  var params = {
    method:"POST",
    headers: {"Authorization": "Bearer " + accessToken},
    muteHttpExceptions:true,
    payload:payloadOfSubmit
  };

  var responseOfSubmit = UrlFetchApp.fetch(url, params);
  //Logger.log(responseOfSubmit);
  var jsonOfSubmit = JSON.parse(responseOfSubmit.getContentText()); 

  return jsonOfSubmit;
}

function googleOAuth2_(name, scope) {

  return OAuth2.createService(name)
    .setAuthorizationBaseUrl('https://accounts.google.com/o/oauth2/auth')
    .setTokenUrl('https://accounts.google.com/o/oauth2/token')
    .setClientId("anonymous")
    .setClientSecret("anonymous")
    .setProjectKey(ScriptApp.getProjectKey())
    .setPropertyStore(PropertiesService.getUserProperties())
    .setScope(scope)
    .setCallbackFunction('authCallback');
}

function authCallback(request) {
  var driveService = getDriveService();
  var isAuthorized = driveService.handleCallback(request);
  if (isAuthorized) {
    return HtmlService.createHtmlOutput('Success! You can close this tab.');
  } else {
    return HtmlService.createHtmlOutput('Denied. You can close this tab');
  }
}

但这给了我一个错误 "Access not granted or expired" 当它试图运行行：

var accessToken = googleOAuth_('google', scope).getAccessToken();

所以我找到了一个应用程序 ScriptApp 方法 getOAuthToken，它似乎可以为我提供所需的令牌。我将上面的行替换为：

var accessToken = ScriptApp.getOAuthToken();

代码执行了，但服务器的响应是 "Error 403 User credentials required"。

这是我根据@Mogsdad 的建议进行的第三次尝试：

function sendPrintJob(docId,myPrinterId,docTitle) {

  var payloadOfSubmit = {
            "printerid" : myPrinterId, 
            "title" : docTitle,
            "content"  : docId, 
            "contentType" : "google.kix" ,
  };

  var request = {
    "method": "POST",
    "headers":{"Authorization": "Bearer "+ScriptApp.getOAuthToken()},    
    "muteHttpExceptions": true
  };

  var responseOfSubmit = UrlFetchApp.fetch("https://www.google.com/cloudprint/submit", request);
  Logger.log(responseOfSubmit);
}

我尝试了多种变体，包括创建开发人员控制台项目和使用那里提供的客户端 ID，但我一直被这两个问题所困（未授予访问权限，或需要凭据）。如果有人能提供任何帮助，我将不胜感激。

Answer 1

以下是允许我将 Google Apps 脚本连接到 Google Cloud Print 的步骤，这样我就可以提交 GCP 作业（这些步骤都是从 Google 中开始的应用程序脚本):

添加 OAuth2 库 (https://github.com/googlesamples/apps-script-oauth2) 给你的 Google Apps 脚本，方法是转到：资源 > 库 > 查找库 MswhXl8fVhTFUH_Q3UOJbXvxhMjh3Sh48 > Select
在 Developer Console Resources > Developer Console Project > 单击项目 link > APIs & Auth > 创建新的 Web 应用程序凭据 > 添加凭据 > OAuth2.0 客户端 ID > Web Application > Set Authorized redirect URIs to the format
https://script.google.com/macros/d/{PROJECT KEY}/usercallback 项目密钥位于文件 > 项目属性下并复制您的客户端 ID 和客户端密码
将 ID 和 Secret 添加到下面的 "getCloudPrintService()" 代码中（替换 client_id 和 client_secret）
转到运行 > 显示URL 并授权脚本。
打开记录器（Cmd + Enter），复制URL并粘贴到新的浏览器选项卡中以完成授权。
转到 https://www.google.com/cloudprint/#printers，select 您的打印机，单击详细信息，展开高级详细信息，然后复制您的 Printer ID（格式为 555aa555-5a55-5555-5555-55555a55a555）
将打印机 ID 添加到下面的 "printGoogleDocument()" 代码中（替换 myPrinterId）

此资源有助于确定步骤：http://ctrlq.org/code/20061-google-cloud-print-with-apps-script，您可能还会发现这些 link 有帮助：

function showURL() {
  var cpService = getCloudPrintService();
  if (!cpService.hasAccess()) {
    Logger.log(cpService.getAuthorizationUrl());
  } else {
    Logger.log("You already have access to this service.");
  }
}
 
function getCloudPrintService() {
  return OAuth2.createService('print')
    .setAuthorizationBaseUrl('https://accounts.google.com/o/oauth2/auth')
    .setTokenUrl('https://accounts.google.com/o/oauth2/token')
    .setClientId(client_id)
    .setClientSecret(client_secret)
    .setCallbackFunction('authCallback')
    .setPropertyStore(PropertiesService.getUserProperties())
    .setScope('https://www.googleapis.com/auth/cloudprint')
    .setParam('login_hint', Session.getActiveUser().getEmail())
    .setParam('access_type', 'offline')
    .setParam('approval_prompt', 'force');
}
 
function authCallback(request) {
  var isAuthorized = getCloudPrintService().handleCallback(request);
  if (isAuthorized) {
    return HtmlService.createHtmlOutput('You can now use Google Cloud Print from Apps Script.');
  } else {
    return HtmlService.createHtmlOutput('Cloud Print Error: Access Denied');
  }
}

function getPrinterList() {
  var response = UrlFetchApp.fetch('https://www.google.com/cloudprint/search', {
    headers: {
      Authorization: 'Bearer ' + getCloudPrintService().getAccessToken()
    },
    muteHttpExceptions: true
  }).getContentText();
 
  var printers = JSON.parse(response).printers;
 
  for (var p in printers) {
    Logger.log("%s %s %s", printers[p].id, printers[p].name, printers[p].description);
  }
}

function printGoogleDocument(docId, docTitle) {  
  // For notes on ticket options see https://developers.google.com/cloud-print/docs/cdd?hl=en
  var ticket = {
    version: "1.0",
    print: {
      color: {
        type: "STANDARD_COLOR"
      },
      duplex: {
        type: "NO_DUPLEX"
      },
    }
  };
   
  var payload = {
    "printerid" : myPrinterId,
    "content"   : docId,
    "title"  : docTitle,
    "contentType" : "google.kix", // allows you to print google docs
    "ticket"    : JSON.stringify(ticket),
  };
 
  var response = UrlFetchApp.fetch('https://www.google.com/cloudprint/submit', {
    method: "POST",
    payload: payload,
    headers: {
      Authorization: 'Bearer ' + getCloudPrintService().getAccessToken()
    },
    "muteHttpExceptions": true
  });
 
  // If successful, should show a job here: https://www.google.com/cloudprint/#jobs

  response = JSON.parse(response);
  if (response.success) {
    Logger.log("%s", response.message);
  } else {
    Logger.log("Error Code: %s %s", response.errorCode, response.message);
  }
  return response;
}

Answer 2

范围“https://www.googleapis.com/auth/cloudprint" has to be included explicitly在 manifest file

appscript.json（查看 > 显示清单文件）

{
  "timeZone": "Europe/Paris",
  "dependencies": {
  },
  "oauthScopes": [
    "https://www.googleapis.com/auth/documents",
    "https://www.googleapis.com/auth/drive",
    "https://www.googleapis.com/auth/script.container.ui",
    "https://www.googleapis.com/auth/script.external_request",
    "https://www.googleapis.com/auth/spreadsheets",
    "https://www.googleapis.com/auth/cloudprint"
  ],
  "exceptionLogging": "STACKDRIVER"
}

Code.gs

function listPrinters() {
  var options = {
    headers: {
      authorization: 'OAuth ' + ScriptApp.getOAuthToken()
    }
  }
  var response = UrlFetchApp.fetch('https://www.google.com/cloudprint/search', options);
  Logger.log(response);
}

带有 Google 云打印的 OAuth2

OAuth2 with Google Cloud Print

google-apps-script

oauth-2.0

google-cloud-print

google-oauth