上传到Google Cloud Storage时获得403 SignatureDoesNotMatch？

我正在尝试将客户端上的音频文件直接上传到我的Google Cloud Storage存储桶，目的是避免服务器端上传（文件大小受限制）。

我的问题：上传时出现403 SignatureDoesNotMatch错误。

这是响应中的错误：

<Error>
<Code>SignatureDoesNotMatch</Code>
<Message> The request signature we calculated does not match the signature you provided. Check your Google secret key and signing method</Message>
<StringToSign>
PUT

audio/mp3
1511112552
/bucketname/pathtofile/019%20-%20top%20cntndr%20V1.mp3
</StringToSign>
</Error>

我已经创建了一个签名的URL。看起来像这样：

https://storage.googleapis.com/google-testbucket/testdata.txt?GoogleAccessId=
[email protected]&Expires=1331155464&Signature=BCl
z9e4UA2MRRDX62TPd8sNpUCxVsqUDG3YGPWvPcwN%2BmWBPqwgUYcOSszCPlgWREeF7oPGowkeKk
7J4WApzkzxERdOQmAdrvshKSzUHg8Jqp1lw9tbiJfE2ExdOOIoJVmGLoDeAGnfzCd4fTsWcLbal9
sFpqXsQI8IQi1493mw%3D

签名的网址是根据此处的Google文档中的指南构建的：https：//cloud.google.com/storage/docs/access-control/create-signed-urls-program

但是，在文档中非常不清楚处理该签名url的客户端javascript部分。

这是我的python代码，用于创建并返回已签名的url。

GOOGLE_SERVICE_CREDENTIALS = 'google-service-credentials.json'

def get_signed_url(request):
    filename = request.GET.get('filename')
    expiration = request.GET.get('expiration')
    type = request.GET.get('type')
    signed_url = CloudStorageSignedURL(
                method='PUT',
                file_name=filename,
                expiration_m=expiration,
                content_type=type
                )
    signed_url = signed_url.sign_url()


    return JsonResponse({ 'signed_url': signed_url })






class CloudStorageSignedURL(object):


    def __init__(self, method, file_name, expiration_m, content_type):
        self.HTTP_method = method
        self.content_type = 'content-type: ' + content_type
        self.expiration = int(expiration_m)
        self.file_name = file_name


    def sign_url(self):


        expiration_dt = datetime.utcnow() + timedelta(minutes=self.expiration)
        expiration = int(time.mktime( expiration_dt.timetuple() ))
        bucket_path = '/' + settings.CLOUD_STORAGE_BUCKET + '/dev/tests/' + self.file_name
        signature_string = self.HTTP_method + '\n' + '\n' + self.content_type + "\n" + str(expiration) + '\n' + bucket_path
        print(signature_string)
        creds = ServiceAccountCredentials.from_json_keyfile_name(GOOGLE_SERVICE_CREDENTIALS)
        client_email = creds.service_account_email
        signature = creds.sign_blob(signature_string)[1]
        encoded_signature = base64.urlsafe_b64encode(signature).decode('utf-8')
        base_url = settings.CLOUD_STORAGE_ROOT + 'dev/tests/' + self.file_name


        return base_url + '?GoogleAccessId=' + client_email + '&Expires=' + str(expiration) + '&Signature=' + encoded_signature

客户端Javascript上传文件

import $ from 'jquery';
import axios from 'axios';



$("document").ready( () => {
  console.log('window loaded');


  $("#id_audio_file").change(function() {

    const file = this.files[0]

    const url = window.location.href.replace('submit/', 'upload/');
    $.get(url + `?filename=${file.name}&expiration=10&type=${file.type}`, (data) => {
      upload(data.signed_url, file);
    })

  });
});



function upload(url, file) {

  const config = {
    headers: {
      'Content-Type': file.type,
    }
  }

  axios.put(url, file, config)
    .then(function (res) {
      console.log(res);
    })
    .catch(function (err) {
      console.log(err);
    });
}

我真的觉得我已经涵盖了这里的所有基础，但是显然我错过了几分钟。任何帮助将不胜感激！