从javascript调用Google云打印/搜索API

Question

有没有人使用JavaScript的Google Cloud Print(特别是/ search)API取得了成功？

我尝试了很多方法,但不断收到以下错误.

XMLHttpRequest无法加载https://www.google.com/cloudprint/search.请求的资源上不存在"Access-Control-Allow-Origin"标头.因此,不允许来源" http:// localhost:8080 "访问.

代码段:

    var search = new XMLHttpRequest();

    search.open('POST', 'https://www.google.com/cloudprint/search', true);
    search.withCredentials = true;          
    search.setRequestHeader("X-Cloud-Print", "Google-JS");

    search.onreadystatechange = function(response){
            console.log(response);
    };

    search.send();

我可以使用演示表格帖子:

    <form action="https://www.google.com/cloudprint/search" method="post" enctype="multipart/form-data" id="submitForm">
      <input type="submit" value="Search"/>
    </form>     

从完全相同的网页,它是成功的; 我花了很长时间确保这两个请求在提交的数据和标题方面看起来完全相同但无济于事.我不愿意用Java写这个(试图避免服务器后端参与)并欢迎任何帮助.

Answer 1

验证.html:

<a href='<?!= getAuthURL(); ?>' target='_blank'>
<button>Authorize!</button>
</a>

授权。

  function test() {
  var html = HtmlService.createTemplateFromFile("Auth").evaluate().setSandboxMode(HtmlService.SandboxMode.NATIVE).setTitle("Test");
  SpreadsheetApp.getUi().showModalDialog(html, "Test");
}
function getAuthURL() {
  var options= {
    client_id : "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com", // your id
    scope : "https://www.googleapis.com/auth/cloudprint",
    redirect_uri : "https://script.google.com/macros/d/MDYeOxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/usercallback", // your uri
    state : ScriptApp.newStateToken().withMethod("getAuthResponse").createToken()
  };
  var url = "https://accounts.google.com/o/oauth2/auth?response_type=code&access_type=offline";
  for(var i in options) 
    url += "&"+i+"="+encodeURIComponent(options[i]);
  return url;
}

获取 oAuth 令牌并调用 Google 云打印

function getAuthResponse(q) {
  var options = {
    method: "post",
    muteHttpExceptions: true,
    payload: {
      code: q.parameter.code,
      client_id : "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com", // your id 
      client_secret : "xxxxxxxxxxxxxxxxxxxxxxxx", // your secret
      redirect_uri: "https://script.google.com/macros/d/MDYeOxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/usercallback", // your uri
      grant_type: "authorization_code"
    }
  }
  var response = JSON.parse(UrlFetchApp.fetch("https://accounts.google.com/o/oauth2/token", options));
  var auth_string = response.token_type+" "+response.access_token;
  options.method = "get";
  options.payload = null;
  options.headers = {Authorization: auth_string};
  response = UrlFetchApp.fetch("https://www.google.com/cloudprint/search",options);
  return ContentService.createTextOutput(response.getContentText());
}