Simple script to upload a file to S3 using a pre-signed URL

s3upload.py

#!/usr/bin/env python
# Reference: http://docs.aws.amazon.com/AmazonS3/latest/dev/PresignedUrlUploadObject.html
import argparse
import os

import boto
import requests


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Upload file to S3 using signed URL.')
    parser.add_argument('filepath', help='File to be uploaded.')
    parser.add_argument('bucket', help='Bucket name.')
    parser.add_argument('key', help='Key to be used.')
    parser.add_argument('--region', default='us-east-1', help='AWS bucket region.')
    args = parser.parse_args()

    s3 = boto.s3.connect_to_region(args.region)
    content_length = os.stat(args.filepath).st_size
    signed_url = s3.generate_url(30, 'PUT', args.bucket, args.key, headers={'Content-Length': str(content_length)})
    print('Using URL "%s"' % signed_url)

    with open(args.filepath) as fp:
        requests.put(signed_url, data=fp, headers={'Content-Length': content_length})

    key = s3.get_bucket(args.bucket).get_key(args.key)
    print('Uploaded %s bytes to s3://%s/%s' % (key.size, args.bucket, args.key))