Signing AWS requests

amazon_signing.py

def _sign_params(self, params, host, uri="/", action="GET"):
    buffer = "%s\n" % action
    buffer += "%s\n" % host
    buffer += "%s\n" % uri
    buffer += '&'.join("%s=%s" % (self._quote(i[0]), self._quote(i[1])) for i in sorted(params.items()))
    signature = base64.b64encode(
      hmac.new(self.secret_access_key, buffer, hashlib.sha256).digest()
    )
    return signature

def _quote(self, obj):
    return urllib.quote(str(obj), '')