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
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Answer
This is covered in the github issue https://github.com/boto/boto3/issues/934
For uploading an object, you should use generate_presigned_post. There are several parameters that cannot be embedded within the url, and those are returned to you by that method.