How can I generate an S3 signed URL for a custom domain mapped via CNAME?

[crowdwave]

This issue explains precisely how to do it for JavaScript, but how to do it in Python/boto3?

aws/aws-sdk-js#891

I can't find any documentation that explains how to do what the JavaScript SDK does.

thanks

[joguSD]

I think you should be able to do this by setting the endpoint_url when creating a client to your domain. You'll also need to add a config for S3 by passing config=Config(s3={'addressing_style': 'path'})

import boto3
from botocore.client import Config

s3 = boto3.client('s3', endpoint_url='https://yoururl.com', config=Config(s3={'addressing_style': 'path'}))
url = s3.generate_presigned_url(ClientMethod='get_object', Params={'Bucket':'bucket', 'Key':'key'})

[crowdwave]

Thanks for this answer which is correct, but in the end I had to go for a solution implementing CloudFront private content because you can only do HTTP if you get signed URLs for S3, not hTTPS.

[joguSD]

Good catch on the HTTP(S) thing. I'm glad you got something working for your use case!