Generate signed request for amazon s3 upload

s3_sign.py

#!/usr/bin/env python

import json

from boto.s3.connection import S3Connection

AWS_ACCESS_KEY_ID = '<your key id here>'
AWS_SECRET_ACCESS_KEY = '<your access key here>'


def sign(bucket_name, key_name=None, expires_in=None, size=None):
    conditions = [
        '["starts-with", "$Content-Type", ""]'
    ]

    if not key_name:
        key_name = '${filename}'
    elif '${filename}' not in key_name:
        key_name += '/${filename}'

    if not size:
        size = 1 * 1000 * 1000 * 100  # 100M

    if not expires_in:
        expires_in = 1 * 60 * 60 * 24 * 365 * 2  # 2 years

    conn = S3Connection(AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY)

    p = conn.build_post_form_args(bucket_name, key_name, acl='bucket-owner-full-control',
                                  max_content_length=size, conditions=conditions,
                                  http_method='http', expires_in=expires_in)

    params = {}

    for field in p['fields']:
        params[field['name']] = field['value']

    params['url'] = p['action']

    return json.dumps(params)


if __name__ == '__main__':
    bucket_name = 'pydocx'
    key_name = 'pydocx'

    data = sign(bucket_name, key_name)

    print data