Generate a S3 PreSigned URL for uploading files

presigned.py

#!/usr/bin/env python3
# /// script
# requires-python = ">=3.13"
# dependencies = [
#     "boto3",
# ]
# ///

import argparse
import boto3
import sys

def main():
    parser = argparse.ArgumentParser(
            prog='s3_upload_presigned_url',
            description='Generate a S3 PreSigned URL for uploading files')

    parser.add_argument('-r', '--region', default=None)
    parser.add_argument('-b', '--bucket', required=True, help='Name of S3 Bucket')
    parser.add_argument('-p', '--path', required=True, help='A path in Bucket to upload file(s) to.')
    parser.add_argument('-e', '--expires', default=3600, help='Seconds to expires. Default to 3600')

    args = parser.parse_args()

    s3 = boto3.client('s3', region_name=args.region)

    presigned_url = s3.generate_presigned_url(
        ClientMethod='put_object',
        Params={ 'Bucket': args.bucket, 'Key': args.path },
        ExpiresIn=args.expires,
        HttpMethod='PUT')

    print(presigned_url)

if __name__ == '__main__':
    main()