在 BlobBuilder 中更改文件名以作为 XHR 上的 FormData 传递

2022-01-15 00:00:00 mime-types multipartform-data xmlhttprequest javascript

我目前正在尝试将 ArrayBuffer 上传到服务器(我无法更改)，该服务器期望我上传的文件采用 multipart/form-data 格式.服务器从 Content-Disposition 部分中提取将被保存的 filename 并在 Content-type 下提取服务时将使用的 MIME 类型文件.目前，我已成功上传文件:

I'm currently trying to upload an ArrayBuffer to a server (which i can't change) that expects the file i'm uploading on a multipart/form-data format. The server extracts from the Content-Disposition part the filename that will be saved and under Content-type the MIME type which will be used when serving the file. Currently, i'm succesful on uploading the file with:

var xhr = new XMLHttpRequest();
var fdata = new FormData();
var bb;

if (WebKitBlobBuilder) {
    bb = new WebKitBlobBuilder();
} else if (MozBlobBuilder) {
    bb = new MozBlobBuilder();
} else if (BlobBuilder) {
    bb = new BlobBuilder();
}

bb.append(obj.array);

fdata.append('file', bb.getBlob("application/octet-stream"));

xhr.open("POST", url, true);
xhr.send(fdata);

但标头是按照浏览器的喜好发送的，例如在 Chrome 上:

But the headers are sent as the browser likes, on Chrome for example:

Content-Disposition: form-data; name="file"; filename="blob"
Content-Type: application/octet-stream;

我曾考虑使用 FileWriter API 将其保存到临时文件中，然后上传，但这是不对的.

I've contemplated saving it to a temporary file with FileWriter API and then upload it, but that just isn't right.

回答时要考虑:

  • 服务器无法修改，我也不愿意选择其他服务器提供商.
  • 它必须至少在 Firefox 和 Chrome 上运行(我的应用已经仅限于这两种浏览器).

推荐答案

刚刚自己解决了，感谢 Chromium 问题指出 w3c 标准草案的答案 XMLHttpRequest.基本上我应该改变:

Just solved it myself, thanks to a Chromium issue pointing me to the answer on w3c standard draft XMLHttpRequest. Basically i should change:

fdata.append('file', bb.getBlob("application/octet-stream"));

到:

fdata.append('file', bb.getBlob("application/octet-stream"), obj.filename);

它给出了想要的结果.

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