rest-api-blueprint / restapiblueprint / lib /

"""2-legged OAuth 1.0 utilities.

Simplifies usage to signing and verifying.

The signature parameters can be carried either in the URL or in the HTTP
Authorization header (two functions provided). The Verify function looks in both
places. No support is provided for carrying or verifing the OAuth parameters in
the body.

The body is NOT included in the signature. Also, no body hash is created and so
there is no oauth_body_hash parameter. This is because it is not part of the
specification and because it has a performance impact with large messages. We
trick the oauth2 library into not hashing the body by setting


import oauth2
import time
import urlparse

# Declared oauth2 Signature method (standard HMAC_SHA1).
SIGNATURE_METHOD = oauth2.SignatureMethod_HMAC_SHA1()

# A "server" to sign requests.
oauth_server = oauth2.Server()

def verify(get_secret, url, method, headers):
    """Verify (2-legged) oauth request.

    The get_secret function should take a consumer key and return the consumer
    secret or raise a KeyError.

    The oauth parameters can be in the "Authorization" header (found in headers)
    or in the URL parameters.

    Return the consumer secret key if verified ok, otherwise returns None. This
    is because the Python caller is very likely to go on to check that the
    verified HTTP caller is allowed to perform the action.

    # We will build a set of all parameters...
    parameters = {}

    # Merge in parameters from the header, if defined.
    if 'Authorization' in headers:
        auth_header = headers['Authorization']
        if auth_header[:6] == 'OAuth ':
            auth_header = auth_header[6:]
                # Get the parameters from the header.
                header_params = oauth2.Request._split_header(auth_header)
                raise ValueError(
                    'Unable to parse OAuth parameters from header.')

    # Merge in parameters from the URL.
    param_str = urlparse.urlparse(url)[4]
    url_params = oauth2.Request._split_url_string(param_str)

    # Make the oauth2.Consumer object (key and secret).
        key = parameters['oauth_consumer_key']
        secret = get_secret(key)
        consumer = oauth2.Consumer(key, secret)
    except KeyError:
        return None  # Missing consumer key or secret

    # Create the oauth Request.
    (scheme, netloc, path, params, query, fragment) = urlparse.urlparse(url)
    base_url = urlparse.urlunparse((scheme, netloc, path, None, None, None))
    req = oauth2.Request(method, base_url, parameters, is_form_encoded=True)

    # Verify signature.
        oauth_server.verify_request(req, consumer, None)
        return key
    except oauth2.Error:
        return None

def get_HMAC_SHA1_signature_as_url(key, secret, url, http_method):
    """Create a two legged oauth HMAC_SHA1 signature.

    The key and secret are oauth consumer pairs.

    The created oauth signature parameters are included in the returned URL.

    return _sign(SIGNATURE_METHOD, key, secret, url, http_method).to_url()

def get_HMAC_SHA1_signature_as_header(key, secret, url, http_method):
    """Create a two legged oauth HMAC_SHA1 signature.

    The key and secret are oauth consumer pairs.

    The created oauth signature parameters are included in the returned headers

    return _sign(SIGNATURE_METHOD, key, secret, url, http_method).to_header()

def _sign(signature_method, key, secret, url, http_method):
    """Sign and return details in an oauth2.Request object."""
    parameters = {}
        'oauth_version': "1.0",
        'oauth_nonce': oauth2.generate_nonce(),
        'oauth_timestamp': int(time.time()),
        'oauth_consumer_key': key,
        'oauth_token': ''
    consumer = oauth2.Consumer(key, secret)
    req = oauth2.Request(
        url=url, method=http_method, parameters=parameters,
    req.sign_request(signature_method, consumer, None)
    return req
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