+++ /dev/null
-"""
-The MIT License
-
-Copyright (c) 2007 Leah Culver
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
-"""
-
-import cgi
-import urllib
-import time
-import random
-import urlparse
-import hmac
-import binascii
-
-
-VERSION = '1.0' # Hi Blaine!
-HTTP_METHOD = 'GET'
-SIGNATURE_METHOD = 'PLAINTEXT'
-
-
-class OAuthError(RuntimeError):
- """Generic exception class."""
- def __init__(self, message='OAuth error occured.'):
- self.message = message
-
-def build_authenticate_header(realm=''):
- """Optional WWW-Authenticate header (401 error)"""
- return {'WWW-Authenticate': 'OAuth realm="%s"' % realm}
-
-def escape(s):
- """Escape a URL including any /."""
- return urllib.quote(s, safe='~')
-
-def _utf8_str(s):
- """Convert unicode to utf-8."""
- if isinstance(s, unicode):
- return s.encode("utf-8")
- else:
- return str(s)
-
-def generate_timestamp():
- """Get seconds since epoch (UTC)."""
- return int(time.time())
-
-def generate_nonce(length=8):
- """Generate pseudorandom number."""
- return ''.join([str(random.randint(0, 9)) for i in range(length)])
-
-def generate_verifier(length=8):
- """Generate pseudorandom number."""
- return ''.join([str(random.randint(0, 9)) for i in range(length)])
-
-
-class OAuthConsumer(object):
- """Consumer of OAuth authentication.
-
- OAuthConsumer is a data type that represents the identity of the Consumer
- via its shared secret with the Service Provider.
-
- """
- key = None
- secret = None
-
- def __init__(self, key, secret):
- self.key = key
- self.secret = secret
-
-
-class OAuthToken(object):
- """OAuthToken is a data type that represents an End User via either an access
- or request token.
-
- key -- the token
- secret -- the token secret
-
- """
- key = None
- secret = None
- callback = None
- callback_confirmed = None
- verifier = None
-
- def __init__(self, key, secret):
- self.key = key
- self.secret = secret
-
- def set_callback(self, callback):
- self.callback = callback
- self.callback_confirmed = 'true'
-
- def set_verifier(self, verifier=None):
- if verifier is not None:
- self.verifier = verifier
- else:
- self.verifier = generate_verifier()
-
- def get_callback_url(self):
- if self.callback and self.verifier:
- # Append the oauth_verifier.
- parts = urlparse.urlparse(self.callback)
- scheme, netloc, path, params, query, fragment = parts[:6]
- if query:
- query = '%s&oauth_verifier=%s' % (query, self.verifier)
- else:
- query = 'oauth_verifier=%s' % self.verifier
- return urlparse.urlunparse((scheme, netloc, path, params,
- query, fragment))
- return self.callback
-
- def to_string(self):
- data = {
- 'oauth_token': self.key,
- 'oauth_token_secret': self.secret,
- }
- if self.callback_confirmed is not None:
- data['oauth_callback_confirmed'] = self.callback_confirmed
- return urllib.urlencode(data)
-
- def from_string(s):
- """ Returns a token from something like:
- oauth_token_secret=xxx&oauth_token=xxx
- """
- params = cgi.parse_qs(s, keep_blank_values=False)
- key = params['oauth_token'][0]
- secret = params['oauth_token_secret'][0]
- token = OAuthToken(key, secret)
- try:
- token.callback_confirmed = params['oauth_callback_confirmed'][0]
- except KeyError:
- pass # 1.0, no callback confirmed.
- return token
- from_string = staticmethod(from_string)
-
- def __str__(self):
- return self.to_string()
-
-
-class OAuthRequest(object):
- """OAuthRequest represents the request and can be serialized.
-
- OAuth parameters:
- - oauth_consumer_key
- - oauth_token
- - oauth_signature_method
- - oauth_signature
- - oauth_timestamp
- - oauth_nonce
- - oauth_version
- - oauth_verifier
- ... any additional parameters, as defined by the Service Provider.
- """
- parameters = None # OAuth parameters.
- http_method = HTTP_METHOD
- http_url = None
- version = VERSION
-
- def __init__(self, http_method=HTTP_METHOD, http_url=None, parameters=None):
- self.http_method = http_method
- self.http_url = http_url
- self.parameters = parameters or {}
-
- def set_parameter(self, parameter, value):
- self.parameters[parameter] = value
-
- def get_parameter(self, parameter):
- try:
- return self.parameters[parameter]
- except:
- raise OAuthError('Parameter not found: %s' % parameter)
-
- def _get_timestamp_nonce(self):
- return self.get_parameter('oauth_timestamp'), self.get_parameter(
- 'oauth_nonce')
-
- def get_nonoauth_parameters(self):
- """Get any non-OAuth parameters."""
- parameters = {}
- for k, v in self.parameters.iteritems():
- # Ignore oauth parameters.
- if k.find('oauth_') < 0:
- parameters[k] = v
- return parameters
-
- def to_header(self, realm=''):
- """Serialize as a header for an HTTPAuth request."""
- auth_header = 'OAuth realm="%s"' % realm
- # Add the oauth parameters.
- if self.parameters:
- for k, v in self.parameters.iteritems():
- if k[:6] == 'oauth_':
- auth_header += ', %s="%s"' % (k, escape(str(v)))
- return {'Authorization': auth_header}
-
- def to_postdata(self):
- """Serialize as post data for a POST request."""
- return '&'.join(['%s=%s' % (escape(str(k)), escape(str(v))) \
- for k, v in self.parameters.iteritems()])
-
- def to_url(self):
- """Serialize as a URL for a GET request."""
- return '%s?%s' % (self.get_normalized_http_url(), self.to_postdata())
-
- def get_normalized_parameters(self):
- """Return a string that contains the parameters that must be signed."""
- params = self.parameters
- try:
- # Exclude the signature if it exists.
- del params['oauth_signature']
- except:
- pass
- # Escape key values before sorting.
- key_values = [(escape(_utf8_str(k)), escape(_utf8_str(v))) \
- for k,v in params.items()]
- # Sort lexicographically, first after key, then after value.
- key_values.sort()
- # Combine key value pairs into a string.
- return '&'.join(['%s=%s' % (k, v) for k, v in key_values])
-
- def get_normalized_http_method(self):
- """Uppercases the http method."""
- return self.http_method.upper()
-
- def get_normalized_http_url(self):
- """Parses the URL and rebuilds it to be scheme://host/path."""
- parts = urlparse.urlparse(self.http_url)
- scheme, netloc, path = parts[:3]
- # Exclude default port numbers.
- if scheme == 'http' and netloc[-3:] == ':80':
- netloc = netloc[:-3]
- elif scheme == 'https' and netloc[-4:] == ':443':
- netloc = netloc[:-4]
- return '%s://%s%s' % (scheme, netloc, path)
-
- def sign_request(self, signature_method, consumer, token):
- """Set the signature parameter to the result of build_signature."""
- # Set the signature method.
- self.set_parameter('oauth_signature_method',
- signature_method.get_name())
- # Set the signature.
- self.set_parameter('oauth_signature',
- self.build_signature(signature_method, consumer, token))
-
- def build_signature(self, signature_method, consumer, token):
- """Calls the build signature method within the signature method."""
- return signature_method.build_signature(self, consumer, token)
-
- def from_request(http_method, http_url, headers=None, parameters=None,
- query_string=None):
- """Combines multiple parameter sources."""
- if parameters is None:
- parameters = {}
-
- # Headers
- if headers and 'Authorization' in headers:
- auth_header = headers['Authorization']
- # Check that the authorization header is OAuth.
- if auth_header[:6] == 'OAuth ':
- auth_header = auth_header[6:]
- try:
- # Get the parameters from the header.
- header_params = OAuthRequest._split_header(auth_header)
- parameters.update(header_params)
- except:
- raise OAuthError('Unable to parse OAuth parameters from '
- 'Authorization header.')
-
- # GET or POST query string.
- if query_string:
- query_params = OAuthRequest._split_url_string(query_string)
- parameters.update(query_params)
-
- # URL parameters.
- param_str = urlparse.urlparse(http_url)[4] # query
- url_params = OAuthRequest._split_url_string(param_str)
- parameters.update(url_params)
-
- if parameters:
- return OAuthRequest(http_method, http_url, parameters)
-
- return None
- from_request = staticmethod(from_request)
-
- def from_consumer_and_token(oauth_consumer, token=None,
- callback=None, verifier=None, http_method=HTTP_METHOD,
- http_url=None, parameters=None):
- if not parameters:
- parameters = {}
-
- defaults = {
- 'oauth_consumer_key': oauth_consumer.key,
- 'oauth_timestamp': generate_timestamp(),
- 'oauth_nonce': generate_nonce(),
- 'oauth_version': OAuthRequest.version,
- }
-
- defaults.update(parameters)
- parameters = defaults
-
- if token:
- parameters['oauth_token'] = token.key
- if token.callback:
- parameters['oauth_callback'] = token.callback
- # 1.0a support for verifier.
- if verifier:
- parameters['oauth_verifier'] = verifier
- elif callback:
- # 1.0a support for callback in the request token request.
- parameters['oauth_callback'] = callback
-
- return OAuthRequest(http_method, http_url, parameters)
- from_consumer_and_token = staticmethod(from_consumer_and_token)
-
- def from_token_and_callback(token, callback=None, http_method=HTTP_METHOD,
- http_url=None, parameters=None):
- if not parameters:
- parameters = {}
-
- parameters['oauth_token'] = token.key
-
- if callback:
- parameters['oauth_callback'] = callback
-
- return OAuthRequest(http_method, http_url, parameters)
- from_token_and_callback = staticmethod(from_token_and_callback)
-
- def _split_header(header):
- """Turn Authorization: header into parameters."""
- params = {}
- parts = header.split(',')
- for param in parts:
- # Ignore realm parameter.
- if param.find('realm') > -1:
- continue
- # Remove whitespace.
- param = param.strip()
- # Split key-value.
- param_parts = param.split('=', 1)
- # Remove quotes and unescape the value.
- params[param_parts[0]] = urllib.unquote(param_parts[1].strip('\"'))
- return params
- _split_header = staticmethod(_split_header)
-
- def _split_url_string(param_str):
- """Turn URL string into parameters."""
- parameters = cgi.parse_qs(param_str, keep_blank_values=False)
- for k, v in parameters.iteritems():
- parameters[k] = urllib.unquote(v[0])
- return parameters
- _split_url_string = staticmethod(_split_url_string)
-
-class OAuthServer(object):
- """A worker to check the validity of a request against a data store."""
- timestamp_threshold = 300 # In seconds, five minutes.
- version = VERSION
- signature_methods = None
- data_store = None
-
- def __init__(self, data_store=None, signature_methods=None):
- self.data_store = data_store
- self.signature_methods = signature_methods or {}
-
- def set_data_store(self, data_store):
- self.data_store = data_store
-
- def get_data_store(self):
- return self.data_store
-
- def add_signature_method(self, signature_method):
- self.signature_methods[signature_method.get_name()] = signature_method
- return self.signature_methods
-
- def fetch_request_token(self, oauth_request):
- """Processes a request_token request and returns the
- request token on success.
- """
- try:
- # Get the request token for authorization.
- token = self._get_token(oauth_request, 'request')
- except OAuthError:
- # No token required for the initial token request.
- version = self._get_version(oauth_request)
- consumer = self._get_consumer(oauth_request)
- try:
- callback = self.get_callback(oauth_request)
- except OAuthError:
- callback = None # 1.0, no callback specified.
- self._check_signature(oauth_request, consumer, None)
- # Fetch a new token.
- token = self.data_store.fetch_request_token(consumer, callback)
- return token
-
- def fetch_access_token(self, oauth_request):
- """Processes an access_token request and returns the
- access token on success.
- """
- version = self._get_version(oauth_request)
- consumer = self._get_consumer(oauth_request)
- try:
- verifier = self._get_verifier(oauth_request)
- except OAuthError:
- verifier = None
- # Get the request token.
- token = self._get_token(oauth_request, 'request')
- self._check_signature(oauth_request, consumer, token)
- new_token = self.data_store.fetch_access_token(consumer, token, verifier)
- return new_token
-
- def verify_request(self, oauth_request):
- """Verifies an api call and checks all the parameters."""
- # -> consumer and token
- version = self._get_version(oauth_request)
- consumer = self._get_consumer(oauth_request)
- # Get the access token.
- token = self._get_token(oauth_request, 'access')
- self._check_signature(oauth_request, consumer, token)
- parameters = oauth_request.get_nonoauth_parameters()
- return consumer, token, parameters
-
- def authorize_token(self, token, user):
- """Authorize a request token."""
- return self.data_store.authorize_request_token(token, user)
-
- def get_callback(self, oauth_request):
- """Get the callback URL."""
- return oauth_request.get_parameter('oauth_callback')
-
- def build_authenticate_header(self, realm=''):
- """Optional support for the authenticate header."""
- return {'WWW-Authenticate': 'OAuth realm="%s"' % realm}
-
- def _get_version(self, oauth_request):
- """Verify the correct version request for this server."""
- try:
- version = oauth_request.get_parameter('oauth_version')
- except:
- version = VERSION
- if version and version != self.version:
- raise OAuthError('OAuth version %s not supported.' % str(version))
- return version
-
- def _get_signature_method(self, oauth_request):
- """Figure out the signature with some defaults."""
- try:
- signature_method = oauth_request.get_parameter(
- 'oauth_signature_method')
- except:
- signature_method = SIGNATURE_METHOD
- try:
- # Get the signature method object.
- signature_method = self.signature_methods[signature_method]
- except:
- signature_method_names = ', '.join(self.signature_methods.keys())
- raise OAuthError('Signature method %s not supported try one of the '
- 'following: %s' % (signature_method, signature_method_names))
-
- return signature_method
-
- def _get_consumer(self, oauth_request):
- consumer_key = oauth_request.get_parameter('oauth_consumer_key')
- consumer = self.data_store.lookup_consumer(consumer_key)
- if not consumer:
- raise OAuthError('Invalid consumer.')
- return consumer
-
- def _get_token(self, oauth_request, token_type='access'):
- """Try to find the token for the provided request token key."""
- token_field = oauth_request.get_parameter('oauth_token')
- token = self.data_store.lookup_token(token_type, token_field)
- if not token:
- raise OAuthError('Invalid %s token: %s' % (token_type, token_field))
- return token
-
- def _get_verifier(self, oauth_request):
- return oauth_request.get_parameter('oauth_verifier')
-
- def _check_signature(self, oauth_request, consumer, token):
- timestamp, nonce = oauth_request._get_timestamp_nonce()
- self._check_timestamp(timestamp)
- self._check_nonce(consumer, token, nonce)
- signature_method = self._get_signature_method(oauth_request)
- try:
- signature = oauth_request.get_parameter('oauth_signature')
- except:
- raise OAuthError('Missing signature.')
- # Validate the signature.
- valid_sig = signature_method.check_signature(oauth_request, consumer,
- token, signature)
- if not valid_sig:
- key, base = signature_method.build_signature_base_string(
- oauth_request, consumer, token)
- raise OAuthError('Invalid signature. Expected signature base '
- 'string: %s' % base)
- built = signature_method.build_signature(oauth_request, consumer, token)
-
- def _check_timestamp(self, timestamp):
- """Verify that timestamp is recentish."""
- timestamp = int(timestamp)
- now = int(time.time())
- lapsed = abs(now - timestamp)
- if lapsed > self.timestamp_threshold:
- raise OAuthError('Expired timestamp: given %d and now %s has a '
- 'greater difference than threshold %d' %
- (timestamp, now, self.timestamp_threshold))
-
- def _check_nonce(self, consumer, token, nonce):
- """Verify that the nonce is uniqueish."""
- nonce = self.data_store.lookup_nonce(consumer, token, nonce)
- if nonce:
- raise OAuthError('Nonce already used: %s' % str(nonce))
-
-
-class OAuthClient(object):
- """OAuthClient is a worker to attempt to execute a request."""
- consumer = None
- token = None
-
- def __init__(self, oauth_consumer, oauth_token):
- self.consumer = oauth_consumer
- self.token = oauth_token
-
- def get_consumer(self):
- return self.consumer
-
- def get_token(self):
- return self.token
-
- def fetch_request_token(self, oauth_request):
- """-> OAuthToken."""
- raise NotImplementedError
-
- def fetch_access_token(self, oauth_request):
- """-> OAuthToken."""
- raise NotImplementedError
-
- def access_resource(self, oauth_request):
- """-> Some protected resource."""
- raise NotImplementedError
-
-
-class OAuthDataStore(object):
- """A database abstraction used to lookup consumers and tokens."""
-
- def lookup_consumer(self, key):
- """-> OAuthConsumer."""
- raise NotImplementedError
-
- def lookup_token(self, oauth_consumer, token_type, token_token):
- """-> OAuthToken."""
- raise NotImplementedError
-
- def lookup_nonce(self, oauth_consumer, oauth_token, nonce):
- """-> OAuthToken."""
- raise NotImplementedError
-
- def fetch_request_token(self, oauth_consumer, oauth_callback):
- """-> OAuthToken."""
- raise NotImplementedError
-
- def fetch_access_token(self, oauth_consumer, oauth_token, oauth_verifier):
- """-> OAuthToken."""
- raise NotImplementedError
-
- def authorize_request_token(self, oauth_token, user):
- """-> OAuthToken."""
- raise NotImplementedError
-
-
-class OAuthSignatureMethod(object):
- """A strategy class that implements a signature method."""
- def get_name(self):
- """-> str."""
- raise NotImplementedError
-
- def build_signature_base_string(self, oauth_request, oauth_consumer, oauth_token):
- """-> str key, str raw."""
- raise NotImplementedError
-
- def build_signature(self, oauth_request, oauth_consumer, oauth_token):
- """-> str."""
- raise NotImplementedError
-
- def check_signature(self, oauth_request, consumer, token, signature):
- built = self.build_signature(oauth_request, consumer, token)
- return built == signature
-
-
-class OAuthSignatureMethod_HMAC_SHA1(OAuthSignatureMethod):
-
- def get_name(self):
- return 'HMAC-SHA1'
-
- def build_signature_base_string(self, oauth_request, consumer, token):
- sig = (
- escape(oauth_request.get_normalized_http_method()),
- escape(oauth_request.get_normalized_http_url()),
- escape(oauth_request.get_normalized_parameters()),
- )
-
- key = '%s&' % escape(consumer.secret)
- if token:
- key += escape(token.secret)
- raw = '&'.join(sig)
- return key, raw
-
- def build_signature(self, oauth_request, consumer, token):
- """Builds the base signature string."""
- key, raw = self.build_signature_base_string(oauth_request, consumer,
- token)
-
- # HMAC object.
- try:
- import hashlib # 2.5
- hashed = hmac.new(key, raw, hashlib.sha1)
- except:
- import sha # Deprecated
- hashed = hmac.new(key, raw, sha)
-
- # Calculate the digest base 64.
- return binascii.b2a_base64(hashed.digest())[:-1]
-
-
-class OAuthSignatureMethod_PLAINTEXT(OAuthSignatureMethod):
-
- def get_name(self):
- return 'PLAINTEXT'
-
- def build_signature_base_string(self, oauth_request, consumer, token):
- """Concatenates the consumer key and secret."""
- sig = '%s&' % escape(consumer.secret)
- if token:
- sig = sig + escape(token.secret)
- return sig, sig
-
- def build_signature(self, oauth_request, consumer, token):
- key, raw = self.build_signature_base_string(oauth_request, consumer,
- token)
- return key
\ No newline at end of file
projects / twitter-api-cdsw / blobdiff