python - 如何使用 Python 请求在 Amazon S3 上执行 `PUT`

Question

我正在尝试使用 Python 请求将文件上传到 Amazon S3(Python 是 v2.7.9，请求是 v2.7)。遵循完美运行的 curl 命令:

curl --request PUT --upload-file img.png https://mybucket-dev.s3.amazonaws.com/6b89e187-26fa-11e5-a04f-a45e60d45b53?Signature=Ow%3D&Expires=1436595966&AWSAccessKeyId=AQ

但是当我对请求执行相同操作时，它会失败。这是我尝试过的:

url = https://mybucket-dev.s3.amazonaws.com/6b89e187-26fa-11e5-a04f-a45e60d45b53?Signature=Ow%3D&Expires=1436595966&AWSAccessKeyId=AQ
requests.put(url, files={'file': base64_encoded_image})
requests.put(url, files={'upload_file': base64_encoded_image})

它失败并显示 403，我得到的响应是:

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

然后我以详细模式运行 curl:

* Hostname was NOT found in DNS cache
*   Trying 54.231.168.134...
* Connected to mybucket-dev.s3.amazonaws.com (54.231.168.134) port 443 (#0)
* TLS 1.2 connection using TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA
* Server certificate: *.s3.amazonaws.com
* Server certificate: VeriSign Class 3 Secure Server CA - G3
* Server certificate: VeriSign Class 3 Public Primary Certification Authority - G5
> PUT /6b89e187-26fa-11e5-a04f-a45e60d45b53?Signature=Ow%3D&Expires=1436595966&AWSAccessKeyId=AQ HTTP/1.1
> User-Agent: curl/7.37.1
> Host: mybucket-dev.s3.amazonaws.com
> Accept: */*
> Content-Length: 52369
> Expect: 100-continue
>
< HTTP/1.1 100 Continue
* We are completely uploaded and fine
< HTTP/1.1 200 OK
< x-amz-id-2: 5lLCQ3FVrTBg2vkyk44E+MecQJb2OGiloO0+2pKePtxPgZptKECNlUyYN43sl4LBNe9f8idh/cc=
< x-amz-request-id: 636A24D53DEB5215
< Date: Fri, 10 Jul 2015 12:04:44 GMT
< ETag: "5802130d4320b56a72afe720e2c323a7"
< Content-Length: 0
* Server AmazonS3 is not blacklisted
< Server: AmazonS3
<
* Connection #0 to host mybucket-dev.s3.amazonaws.com left intact

然后我添加了headers

headers = {'Content-Length': '52369', 'Host': 'mybucket-dev.s3.amazonaws.com', 'Expect': '100-continue', 'Accept': '*/*', 'User-Agent': 'curl/7.37.1'}
requests.put(url, files={'file': base64_encoded_image}, headers=headers)

我尝试了不同的 header 组合，但仍然会抛出相同的错误。然后我也尝试发送查询参数:

payload={'Expires': '1436595966', 'AWSAccessKeyId': 'AQ', 'Signature': 'Ow%3D'}
requests.put(url, files={'file': base64_encoded_image}, headers=headers, data=payload)

它仍然失败并出现同样的错误。我尝试了不带查询参数的 URL，并将它们作为 data=payload 发送给请求，它失败并出现同样的错误。

Answer 1

requests 的工程师帮助我:

with open('img.png', 'rb') as data:
    requests.put(url, data=data)