使用JavaScript的Google云端硬盘：处理文件内容 [英] Google Drive using JavaScript: Handling file content

问题描述

两个月前，在使用JavaScript的Google云端硬盘授权，
@Nivco 撰写关于处理文件内容的文章，这非常诱人：

我们也可以改进文件内容服务器，以便它支持XHR
请求。

<所以，我们在哪里可以找到有关此功能的新闻或路线图，信息等等？

---

^{实际上，这个问题是答复...（ 另一个问题）}

rel =nofollow> CORS 。

文件的ID存储在变量< theID >;这个ID是唯一的，只要文件没有被删除就不会改变（a
$ b

• 第一个 gapi.client.request 检索downloadUrl属性;返回的值是一个短暂的值;
  
• 然后， callback：function 发送一个认证请求以检索该文件感谢它的< downloadUrl>;


• 赢家是......通过返回onreadystatechange = function（theProgressEvent） / li>
  

。

  gapi.client .request（{
'path'：'/ drive / v2 / files /'+ theID，
'method'：'GET'，
 callback：function（theResponseJS，theResponseTXT）{
 var myToken = gapi.auth.getToken（）; 
 var myXHR = new XMLHttpRequest（）; 
 myXHR.open（'GET'，theResponseJS.downloadUrl，true）; 
 myXHR .setRequestHeader（'Authorization'，'Bearer'+ myToken.access_token）; 
 myXHR.onreadystatechange = function（theProgressEvent）{
 if（myXHR.readyState == 4）{
 // 1 =连接正常，2 =收到请求，3 =正在运行， 4 =终止
 if（myXHR.status == 200）{
 // 200 = OK 
 console.log（myXHR.response）; 
} 
} 
} 
 myXHR.send（）; 
} 
}）;使用Chrome 20.0.1132.57 m和Firefox 14.0.1进行测试的
  

^sup>

Two months ago, in Authorization of Google Drive using JavaScript,
@Nivco was writing about "Handling file content", a very tantalizing:

We could also improve the file content server so that it supports XHR requests.

So, where could "we" find news or roadmaps, information et coetera about this feature?

---

^{Actually, this question is a reply... (to another question)}

解决方案

Here is a short example using CORS.
The ID of the file is stored in variable <theID> ; this ID is unique and won't change as long as the file is not deleted (a trashed file is not deleted).

• First gapi.client.request retrieves the downloadUrl property ; the returned value is a short lived value ;
• Then, the callback: function sends an authenticated request in order to retrieve the contents of the file, thanks to its <downloadUrl> ;
• And the winner is… returned via onreadystatechange = function( theProgressEvent ).

.

gapi.client.request({
    'path': '/drive/v2/files/'+theID,
    'method': 'GET',
    callback: function ( theResponseJS, theResponseTXT ) {
        var myToken = gapi.auth.getToken();
        var myXHR   = new XMLHttpRequest();
        myXHR.open('GET', theResponseJS.downloadUrl, true );
        myXHR.setRequestHeader('Authorization', 'Bearer ' + myToken.access_token );
        myXHR.onreadystatechange = function( theProgressEvent ) {
            if (myXHR.readyState == 4) {
//          1=connection ok, 2=Request received, 3=running, 4=terminated
                if ( myXHR.status == 200 ) {
//              200=OK
                    console.log( myXHR.response );
                }
            }
        }
        myXHR.send();
    }
});

^{tested with "Chrome 20.0.1132.57 m" and "Firefox 14.0.1"}

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