如何从Google Picker JavaScript API获取直接下载网址? [英] How to get a direct download URL from Google Picker JavaScript API?
问题描述
我试图使用Google Picker API获取文件的直接下载网址,以便我可以选择文件并将此网址传递给服务器端代码,以便将该文件的副本下载并存储在服务器上。
我可以通过选取器API进行授权,并获取包括文件名和预览网址在内的所选文件的信息(它被简单地称为URL此项目在JSON响应文档中:
您可能想要尝试此文档。注意 url
在之前被初始化,如果
语句:
函数pickerCallback(data){
var url ='nothing';
if(data [google.picker.Response.ACTION] == google.picker.Action.PICKED){
var doc = data [google.picker.Response.DOCUMENTS] [0];
url = doc [google.picker.Document.URL];
}
var message ='您选择了:'+ url;
document.getElementById('result')。innerHTML = message;
}
另外,在授权中,设置 AppId
值,然后选择具有该应用当前OAuth 2.0令牌的用户帐户。请注意,
AppId
集合和用于授权访问用户文件的客户端ID必须包含在同一个应用程序中。然后,在成功获取 fileId
后,您可以使用 files.get
。默认情况下,响应主体会响应一个文件资源,其中包括 downloadUrl
。
有关更多见解,请参阅相关的 SO贴子。
I'm trying to get a direct download URL for a file using Google's Picker API so that I can choose a file and pass this URL to server side code to download and store a copy of the item on the server.
I'm able to authorize through the picker API and get info of a picked file including the file name and preview URL (which is confusingly referred to as simply "A URL to this item" in the JSON response docs: https://developers.google.com/picker/docs/results)
I noticed that there is a post about using the Drive API to get a direct download URL here: Get google drive file download URL
However when I do this in my picker callback function (based on the docs here: https://developers.google.com/picker/docs/)
I get an error of:
"Project [number here] is not found and cannot be used for API calls. If it is recently created, enable Drive API by visiting https://console.developers.google.com/apis/api/drive.googleapis.com/overview?project=[project number here] then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry."
I have the API enabled in my developer console and the URL added to the JS allowed origins.
The documentation is very confusing and there seems to be 3 versions of the REST API to use with Drive which is based on an gapi.auth2 object whereas the picker api uses gapi.auth object.
I'm not sure if I need to authenticate again using the Google Drive API before performing the GET request. This all seems very messy and I believe there must be an easier approach for what is a simple request!
My picker callback function:
pickerCallback: function(data) {
if (data[google.picker.Response.ACTION] == google.picker.Action.PICKED) {
var doc = data[google.picker.Response.DOCUMENTS][0];
var fileName = doc[google.picker.Document.NAME];
var url = doc[google.picker.Document.URL];
var docId = doc[google.picker.Document.ID];
var request = null;
gapi.client.load('drive', 'v2', function() {
request = gapi.client.drive.files.get({
'fileId': docId
});
request.execute(function(resp){
console.log(resp);
});
});
//Write upload details to page
//Populate hidden field
}
Developer console screen - The first app is the picker API the second is for the Drive API:
You may want to try the simple callback implementation shown in this documentation. Notice that url
was initialized before the if
statement:
function pickerCallback(data) {
var url = 'nothing';
if (data[google.picker.Response.ACTION] == google.picker.Action.PICKED) {
var doc = data[google.picker.Response.DOCUMENTS][0];
url = doc[google.picker.Document.URL];
}
var message = 'You picked: ' + url;
document.getElementById('result').innerHTML = message;
}
Also, in authorizing, set the AppId
value and choose the user account with the app's current OAuth 2.0 token. Note that the AppId
set and the client ID used for authorizing access to a user's files must be contained in the same app. Then, after successfully obtaining the fileId
, you can then send request using files.get
. By default, this responds with a Files resource in the response body which includes downloadUrl
.
For additional insights, see this related SO post.
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