BOTO3 - generate_presigned_url for `put_object` return `The request signature we calculated does not match the signature you provided`

Question

I'm trying to create a presigned url that will help some customers to upload files . Here my test script that is currently working

# Get the service client.
s3 = boto3.client('s3')
boto3.set_stream_logger(name='botocore')

# Generate the URL to get 'key-name' from 'bucket-name'
url = s3.generate_presigned_url(
    ClientMethod='put_object',
    Params={
        'Bucket': s3_bucket_name,
        'Key': test_key,
    }    
)

files = StringIO("asdfasdfasdf")
response = requests.put(url, data=files)

print(str(response.content))

But if I'm adding:

`ACL': 'public-read' 

to Params (or add some metadata following the information in the put_object documentation I receive back from the server:

The request signature we calculated does not match the signature you provided. Check your key and signing method.

---

I've open also a issue on BOTO3: https://github.com/boto/boto3/issues/1722

Answer 1

在 Dell ECS 对象存储上使用 S3 时遇到同样的问题。S3 协议已部分实现，因此不支持 ECS 的 POST 方法。解决方法是在 PUT 方法中使用正确的标头，然后在服务器上正确设置对象的 ACL。

    # Get the service client.
    s3 = boto3.client('s3')
    boto3.set_stream_logger(name='botocore')

    # Generate the URL to get 'key-name' from 'bucket-name'
    url = s3.generate_presigned_url(
        ClientMethod='put_object',
        Params={
            'Bucket': s3_bucket_name,
            'Key': test_key,
            'ACL': 'public-read'
        }    
    )

    files = StringIO("asdfasdfasdf")
    headers = {'x-amz-acl': 'public-read'}
    response = requests.put(url, data=files, headers=headers)

    print(str(response.content))

Answer 2

这在 github 问题https://github.com/boto/boto3/issues/934 中有介绍

要上传对象，您应该使用generate_presigned_post。有几个参数不能嵌入到 url 中，这些参数会通过该方法返回给您。