s3_client.py

import sys
import mimetypes
import requests
import requests_aws4auth as aws4auth
import xml.etree.ElementTree as ET
import xml.dom.minidom as minidom

access_id = ''
access_key = ''
region = 'us-west-1'
endpoint = 's3-{}.amazonaws.com'.format(region)
auth = aws4auth.AWS4Auth(access_id, access_key, region, 's3')
ns = 'http://s3.amazonaws.com/doc/2006-03-01/'

def create_bucket(bucket):
    #create the XML needed for the request
    XML = ET.Element('CreateBucketConfiguration')
    XML.attrib['xmlns'] = ns
    location = ET.SubElement(XML, 'LocationConstraint')
    location.text = auth.region
    data = ET.tostring(XML, encoding='utf-8')

    #make the request
    url = 'http://{}.{}'.format(bucket, endpoint)
    r = requests.put(url, data=data, auth=auth)
    if r.ok:
        print('Created bucket {} OK'.format(bucket))
    else:
        handle_error(r)

def upload_file(bucket, s3_name, local_path, acl='private'):
    data = open(local_path, 'rb').read()
    url = 'http://{}.{}/{}'.format(bucket, endpoint, s3_name)
    headers = {'x-amz-acl': acl}
    mimetype = mimetypes.guess_type(local_path)[0]
    if mimetype:
        headers['Content-Type'] = mimetype
    r = requests.put(url, data=data, headers=headers, auth=auth)
    if r.ok:
        print('Uploaded {} OK'.format(local_path))
    else:
        handle_error(r)

def download_file(bucket, s3_name, local_path):
    url = 'http://{}.{}/{}'.format(bucket, endpoint, s3_name)
    r = requests.get(url, auth=auth)
    if r.ok:
        open(local_path, 'wb').write(r.content)
        print('Downloaded {} OK'.format(s3_name))
    else:
        handle_error(r)

def handle_error(response):
    output = 'Status code: {}\n'.format(response.status_code)
    root = ET.fromstring(response.text)
    code =  root.find('Code').text
    output += 'Error code: {}\n'.format(code)
    message = root.find('Message').text
    output += 'Message: {}\n'.format(message)
    print(output)

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if __name__ == '__main__':
    cmd, *args = sys.argv[1:]
    globals()[cmd](*args)