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#!/usr/bin/python
#
# Copyright (C) 2007 - 2009 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import cgi
import math
import random
import re
import time
import types
import urllib
import atom.http_interface
import atom.token_store
import atom.url
import gdata.oauth as oauth
import gdata.oauth.rsa as oauth_rsa
import gdata.tlslite.utils.keyfactory as keyfactory
import gdata.tlslite.utils.cryptomath as cryptomath
import gdata.gauth
__author__ = 'api.jscudder (Jeff Scudder)'
PROGRAMMATIC_AUTH_LABEL = 'GoogleLogin auth='
AUTHSUB_AUTH_LABEL = 'AuthSub token='
"""This module provides functions and objects used with Google authentication.
Details on Google authorization mechanisms used with the Google Data APIs can
be found here:
http://code.google.com/apis/gdata/auth.html
http://code.google.com/apis/accounts/
The essential functions are the following.
Related to ClientLogin:
generate_client_login_request_body: Constructs the body of an HTTP request to
obtain a ClientLogin token for a specific
service.
extract_client_login_token: Creates a ClientLoginToken with the token from a
success response to a ClientLogin request.
get_captcha_challenge: If the server responded to the ClientLogin request
with a CAPTCHA challenge, this method extracts the
CAPTCHA URL and identifying CAPTCHA token.
Related to AuthSub:
generate_auth_sub_url: Constructs a full URL for a AuthSub request. The
user's browser must be sent to this Google Accounts
URL and redirected back to the app to obtain the
AuthSub token.
extract_auth_sub_token_from_url: Once the user's browser has been
redirected back to the web app, use this
function to create an AuthSubToken with
the correct authorization token and scope.
token_from_http_body: Extracts the AuthSubToken value string from the
server's response to an AuthSub session token upgrade
request.
"""
def generate_client_login_request_body(email, password, service, source,
account_type='HOSTED_OR_GOOGLE', captcha_token=None,
captcha_response=None):
"""Creates the body of the autentication request
See http://code.google.com/apis/accounts/AuthForInstalledApps.html#Request
for more details.
Args:
email: str
password: str
service: str
source: str
account_type: str (optional) Defaul is 'HOSTED_OR_GOOGLE', other valid
values are 'GOOGLE' and 'HOSTED'
captcha_token: str (optional)
captcha_response: str (optional)
Returns:
The HTTP body to send in a request for a client login token.
"""
return gdata.gauth.generate_client_login_request_body(email, password,
service, source, account_type, captcha_token, captcha_response)
GenerateClientLoginRequestBody = generate_client_login_request_body
def GenerateClientLoginAuthToken(http_body):
"""Returns the token value to use in Authorization headers.
Reads the token from the server's response to a Client Login request and
creates header value to use in requests.
Args:
http_body: str The body of the server's HTTP response to a Client Login
request
Returns:
The value half of an Authorization header.
"""
token = get_client_login_token(http_body)
if token:
return 'GoogleLogin auth=%s' % token
return None
def get_client_login_token(http_body):
"""Returns the token value for a ClientLoginToken.
Reads the token from the server's response to a Client Login request and
creates the token value string to use in requests.
Args:
http_body: str The body of the server's HTTP response to a Client Login
request
Returns:
The token value string for a ClientLoginToken.
"""
return gdata.gauth.get_client_login_token_string(http_body)
def extract_client_login_token(http_body, scopes):
"""Parses the server's response and returns a ClientLoginToken.
Args:
http_body: str The body of the server's HTTP response to a Client Login
request. It is assumed that the login request was successful.
scopes: list containing atom.url.Urls or strs. The scopes list contains
all of the partial URLs under which the client login token is
valid. For example, if scopes contains ['http://example.com/foo']
then the client login token would be valid for
http://example.com/foo/bar/baz
Returns:
A ClientLoginToken which is valid for the specified scopes.
"""
token_string = get_client_login_token(http_body)
token = ClientLoginToken(scopes=scopes)
token.set_token_string(token_string)
return token
def get_captcha_challenge(http_body,
captcha_base_url='http://www.google.com/accounts/'):
"""Returns the URL and token for a CAPTCHA challenge issued by the server.
Args:
http_body: str The body of the HTTP response from the server which
contains the CAPTCHA challenge.
captcha_base_url: str This function returns a full URL for viewing the
challenge image which is built from the server's response. This
base_url is used as the beginning of the URL because the server
only provides the end of the URL. For example the server provides
'Captcha?ctoken=Hi...N' and the URL for the image is
'http://www.google.com/accounts/Captcha?ctoken=Hi...N'
Returns:
A dictionary containing the information needed to repond to the CAPTCHA
challenge, the image URL and the ID token of the challenge. The
dictionary is in the form:
{'token': string identifying the CAPTCHA image,
'url': string containing the URL of the image}
Returns None if there was no CAPTCHA challenge in the response.
"""
return gdata.gauth.get_captcha_challenge(http_body, captcha_base_url)
GetCaptchaChallenge = get_captcha_challenge
def GenerateOAuthRequestTokenUrl(
oauth_input_params, scopes,
request_token_url='https://www.google.com/accounts/OAuthGetRequestToken',
extra_parameters=None):
"""Generate a URL at which a request for OAuth request token is to be sent.
Args:
oauth_input_params: OAuthInputParams OAuth input parameters.
scopes: list of strings The URLs of the services to be accessed.
request_token_url: string The beginning of the request token URL. This is
normally 'https://www.google.com/accounts/OAuthGetRequestToken' or
'/accounts/OAuthGetRequestToken'
extra_parameters: dict (optional) key-value pairs as any additional
parameters to be included in the URL and signature while making a
request for fetching an OAuth request token. All the OAuth parameters
are added by default. But if provided through this argument, any
default parameters will be overwritten. For e.g. a default parameter
oauth_version 1.0 can be overwritten if
extra_parameters = {'oauth_version': '2.0'}
Returns:
atom.url.Url OAuth request token URL.
"""
scopes_string = ' '.join([str(scope) for scope in scopes])
parameters = {'scope': scopes_string}
if extra_parameters:
parameters.update(extra_parameters)
oauth_request = oauth.OAuthRequest.from_consumer_and_token(
oauth_input_params.GetConsumer(), http_url=request_token_url,
parameters=parameters)
oauth_request.sign_request(oauth_input_params.GetSignatureMethod(),
oauth_input_params.GetConsumer(), None)
return atom.url.parse_url(oauth_request.to_url())
def GenerateOAuthAuthorizationUrl(
request_token,
authorization_url='https://www.google.com/accounts/OAuthAuthorizeToken',
callback_url=None, extra_params=None,
include_scopes_in_callback=False, scopes_param_prefix='oauth_token_scope'):
"""Generates URL at which user will login to authorize the request token.
Args:
request_token: gdata.auth.OAuthToken OAuth request token.
authorization_url: string The beginning of the authorization URL. This is
normally 'https://www.google.com/accounts/OAuthAuthorizeToken' or
'/accounts/OAuthAuthorizeToken'
callback_url: string (optional) The URL user will be sent to after
logging in and granting access.
extra_params: dict (optional) Additional parameters to be sent.
include_scopes_in_callback: Boolean (default=False) if set to True, and
if 'callback_url' is present, the 'callback_url' will be modified to
include the scope(s) from the request token as a URL parameter. The
key for the 'callback' URL's scope parameter will be
OAUTH_SCOPE_URL_PARAM_NAME. The benefit of including the scope URL as
a parameter to the 'callback' URL, is that the page which receives
the OAuth token will be able to tell which URLs the token grants
access to.
scopes_param_prefix: string (default='oauth_token_scope') The URL
parameter key which maps to the list of valid scopes for the token.
This URL parameter will be included in the callback URL along with
the scopes of the token as value if include_scopes_in_callback=True.
Returns:
atom.url.Url OAuth authorization URL.
"""
scopes = request_token.scopes
if isinstance(scopes, list):
scopes = ' '.join(scopes)
if include_scopes_in_callback and callback_url:
if callback_url.find('?') > -1:
callback_url += '&'
else:
callback_url += '?'
callback_url += urllib.urlencode({scopes_param_prefix:scopes})
oauth_token = oauth.OAuthToken(request_token.key, request_token.secret)
oauth_request = oauth.OAuthRequest.from_token_and_callback(
token=oauth_token, callback=callback_url,
http_url=authorization_url, parameters=extra_params)
return atom.url.parse_url(oauth_request.to_url())
def GenerateOAuthAccessTokenUrl(
authorized_request_token,
oauth_input_params,
access_token_url='https://www.google.com/accounts/OAuthGetAccessToken',
oauth_version='1.0',
oauth_verifier=None):
"""Generates URL at which user will login to authorize the request token.
Args:
authorized_request_token: gdata.auth.OAuthToken OAuth authorized request
token.
oauth_input_params: OAuthInputParams OAuth input parameters.
access_token_url: string The beginning of the authorization URL. This is
normally 'https://www.google.com/accounts/OAuthGetAccessToken' or
'/accounts/OAuthGetAccessToken'
oauth_version: str (default='1.0') oauth_version parameter.
oauth_verifier: str (optional) If present, it is assumed that the client
will use the OAuth v1.0a protocol which includes passing the
oauth_verifier (as returned by the SP) in the access token step.
Returns:
atom.url.Url OAuth access token URL.
"""
oauth_token = oauth.OAuthToken(authorized_request_token.key,
authorized_request_token.secret)
parameters = {'oauth_version': oauth_version}
if oauth_verifier is not None:
parameters['oauth_verifier'] = oauth_verifier
oauth_request = oauth.OAuthRequest.from_consumer_and_token(
oauth_input_params.GetConsumer(), token=oauth_token,
http_url=access_token_url, parameters=parameters)
oauth_request.sign_request(oauth_input_params.GetSignatureMethod(),
oauth_input_params.GetConsumer(), oauth_token)
return atom.url.parse_url(oauth_request.to_url())
def GenerateAuthSubUrl(next, scope, secure=False, session=True,
request_url='https://www.google.com/accounts/AuthSubRequest',
domain='default'):
"""Generate a URL at which the user will login and be redirected back.
Users enter their credentials on a Google login page and a token is sent
to the URL specified in next. See documentation for AuthSub login at:
http://code.google.com/apis/accounts/AuthForWebApps.html
Args:
request_url: str The beginning of the request URL. This is normally
'http://www.google.com/accounts/AuthSubRequest' or
'/accounts/AuthSubRequest'
next: string The URL user will be sent to after logging in.
scope: string The URL of the service to be accessed.
secure: boolean (optional) Determines whether or not the issued token
is a secure token.
session: boolean (optional) Determines whether or not the issued token
can be upgraded to a session token.
domain: str (optional) The Google Apps domain for this account. If this
is not a Google Apps account, use 'default' which is the default
value.
"""
# Translate True/False values for parameters into numeric values acceoted
# by the AuthSub service.
if secure:
secure = 1
else:
secure = 0
if session:
session = 1
else:
session = 0
request_params = urllib.urlencode({'next': next, 'scope': scope,
'secure': secure, 'session': session,
'hd': domain})
if request_url.find('?') == -1:
return '%s?%s' % (request_url, request_params)
else:
# The request URL already contained url parameters so we should add
# the parameters using the & seperator
return '%s&%s' % (request_url, request_params)
def generate_auth_sub_url(next, scopes, secure=False, session=True,
request_url='https://www.google.com/accounts/AuthSubRequest',
domain='default', scopes_param_prefix='auth_sub_scopes'):
"""Constructs a URL string for requesting a multiscope AuthSub token.
The generated token will contain a URL parameter to pass along the
requested scopes to the next URL. When the Google Accounts page
redirects the broswser to the 'next' URL, it appends the single use
AuthSub token value to the URL as a URL parameter with the key 'token'.
However, the information about which scopes were requested is not
included by Google Accounts. This method adds the scopes to the next
URL before making the request so that the redirect will be sent to
a page, and both the token value and the list of scopes can be
extracted from the request URL.
Args:
next: atom.url.URL or string The URL user will be sent to after
authorizing this web application to access their data.
scopes: list containint strings The URLs of the services to be accessed.
secure: boolean (optional) Determines whether or not the issued token
is a secure token.
session: boolean (optional) Determines whether or not the issued token
can be upgraded to a session token.
request_url: atom.url.Url or str The beginning of the request URL. This
is normally 'http://www.google.com/accounts/AuthSubRequest' or
'/accounts/AuthSubRequest'
domain: The domain which the account is part of. This is used for Google
Apps accounts, the default value is 'default' which means that the
requested account is a Google Account (@gmail.com for example)
scopes_param_prefix: str (optional) The requested scopes are added as a
URL parameter to the next URL so that the page at the 'next' URL can
extract the token value and the valid scopes from the URL. The key
for the URL parameter defaults to 'auth_sub_scopes'
Returns:
An atom.url.Url which the user's browser should be directed to in order
to authorize this application to access their information.
"""
if isinstance(next, (str, unicode)):
next = atom.url.parse_url(next)
scopes_string = ' '.join([str(scope) for scope in scopes])
next.params[scopes_param_prefix] = scopes_string
if isinstance(request_url, (str, unicode)):
request_url = atom.url.parse_url(request_url)
request_url.params['next'] = str(next)
request_url.params['scope'] = scopes_string
if session:
request_url.params['session'] = 1
else:
request_url.params['session'] = 0
if secure:
request_url.params['secure'] = 1
else:
request_url.params['secure'] = 0
request_url.params['hd'] = domain
return request_url
def AuthSubTokenFromUrl(url):
"""Extracts the AuthSub token from the URL.
Used after the AuthSub redirect has sent the user to the 'next' page and
appended the token to the URL. This function returns the value to be used
in the Authorization header.
Args:
url: str The URL of the current page which contains the AuthSub token as
a URL parameter.
"""
token = TokenFromUrl(url)
if token:
return 'AuthSub token=%s' % token
return None
def TokenFromUrl(url):
"""Extracts the AuthSub token from the URL.
Returns the raw token value.
Args:
url: str The URL or the query portion of the URL string (after the ?) of
the current page which contains the AuthSub token as a URL parameter.
"""
if url.find('?') > -1:
query_params = url.split('?')[1]
else:
query_params = url
for pair in query_params.split('&'):
if pair.startswith('token='):
return pair[6:]
return None
def extract_auth_sub_token_from_url(url,
scopes_param_prefix='auth_sub_scopes', rsa_key=None):
"""Creates an AuthSubToken and sets the token value and scopes from the URL.
After the Google Accounts AuthSub pages redirect the user's broswer back to
the web application (using the 'next' URL from the request) the web app must
extract the token from the current page's URL. The token is provided as a
URL parameter named 'token' and if generate_auth_sub_url was used to create
the request, the token's valid scopes are included in a URL parameter whose
name is specified in scopes_param_prefix.
Args:
url: atom.url.Url or str representing the current URL. The token value
and valid scopes should be included as URL parameters.
scopes_param_prefix: str (optional) The URL parameter key which maps to
the list of valid scopes for the token.
Returns:
An AuthSubToken with the token value from the URL and set to be valid for
the scopes passed in on the URL. If no scopes were included in the URL,
the AuthSubToken defaults to being valid for no scopes. If there was no
'token' parameter in the URL, this function returns None.
"""
if isinstance(url, (str, unicode)):
url = atom.url.parse_url(url)
if 'token' not in url.params:
return None
scopes = []
if scopes_param_prefix in url.params:
scopes = url.params[scopes_param_prefix].split(' ')
token_value = url.params['token']
if rsa_key:
token = SecureAuthSubToken(rsa_key, scopes=scopes)
else:
token = AuthSubToken(scopes=scopes)
token.set_token_string(token_value)
return token
def AuthSubTokenFromHttpBody(http_body):
"""Extracts the AuthSub token from an HTTP body string.
Used to find the new session token after making a request to upgrade a
single use AuthSub token.
Args:
http_body: str The repsonse from the server which contains the AuthSub
key. For example, this function would find the new session token
from the server's response to an upgrade token request.
Returns:
The header value to use for Authorization which contains the AuthSub
token.
"""
token_value = token_from_http_body(http_body)
if token_value:
return '%s%s' % (AUTHSUB_AUTH_LABEL, token_value)
return None
def token_from_http_body(http_body):
"""Extracts the AuthSub token from an HTTP body string.
Used to find the new session token after making a request to upgrade a
single use AuthSub token.
Args:
http_body: str The repsonse from the server which contains the AuthSub
key. For example, this function would find the new session token
from the server's response to an upgrade token request.
Returns:
The raw token value to use in an AuthSubToken object.
"""
for response_line in http_body.splitlines():
if response_line.startswith('Token='):
# Strip off Token= and return the token value string.
return response_line[6:]
return None
TokenFromHttpBody = token_from_http_body
def OAuthTokenFromUrl(url, scopes_param_prefix='oauth_token_scope'):
"""Creates an OAuthToken and sets token key and scopes (if present) from URL.
After the Google Accounts OAuth pages redirect the user's broswer back to
the web application (using the 'callback' URL from the request) the web app
can extract the token from the current page's URL. The token is same as the
request token, but it is either authorized (if user grants access) or
unauthorized (if user denies access). The token is provided as a
URL parameter named 'oauth_token' and if it was chosen to use
GenerateOAuthAuthorizationUrl with include_scopes_in_param=True, the token's
valid scopes are included in a URL parameter whose name is specified in
scopes_param_prefix.
Args:
url: atom.url.Url or str representing the current URL. The token value
and valid scopes should be included as URL parameters.
scopes_param_prefix: str (optional) The URL parameter key which maps to
the list of valid scopes for the token.
Returns:
An OAuthToken with the token key from the URL and set to be valid for
the scopes passed in on the URL. If no scopes were included in the URL,
the OAuthToken defaults to being valid for no scopes. If there was no
'oauth_token' parameter in the URL, this function returns None.
"""
if isinstance(url, (str, unicode)):
url = atom.url.parse_url(url)
if 'oauth_token' not in url.params:
return None
scopes = []
if scopes_param_prefix in url.params:
scopes = url.params[scopes_param_prefix].split(' ')
token_key = url.params['oauth_token']
token = OAuthToken(key=token_key, scopes=scopes)
return token
def OAuthTokenFromHttpBody(http_body):
"""Parses the HTTP response body and returns an OAuth token.
The returned OAuth token will just have key and secret parameters set.
It won't have any knowledge about the scopes or oauth_input_params. It is
your responsibility to make it aware of the remaining parameters.
Returns:
OAuthToken OAuth token.
"""
token = oauth.OAuthToken.from_string(http_body)
oauth_token = OAuthToken(key=token.key, secret=token.secret)
return oauth_token
class OAuthSignatureMethod(object):
"""Holds valid OAuth signature methods.
RSA_SHA1: Class to build signature according to RSA-SHA1 algorithm.
HMAC_SHA1: Class to build signature according to HMAC-SHA1 algorithm.
"""
HMAC_SHA1 = oauth.OAuthSignatureMethod_HMAC_SHA1
class RSA_SHA1(oauth_rsa.OAuthSignatureMethod_RSA_SHA1):
"""Provides implementation for abstract methods to return RSA certs."""
def __init__(self, private_key, public_cert):
self.private_key = private_key
self.public_cert = public_cert
def _fetch_public_cert(self, unused_oauth_request):
return self.public_cert
def _fetch_private_cert(self, unused_oauth_request):
return self.private_key
class OAuthInputParams(object):
"""Stores OAuth input parameters.
This class is a store for OAuth input parameters viz. consumer key and secret,
signature method and RSA key.
"""
def __init__(self, signature_method, consumer_key, consumer_secret=None,
rsa_key=None, requestor_id=None):
"""Initializes object with parameters required for using OAuth mechanism.
NOTE: Though consumer_secret and rsa_key are optional, either of the two
is required depending on the value of the signature_method.
Args:
signature_method: class which provides implementation for strategy class
oauth.oauth.OAuthSignatureMethod. Signature method to be used for
signing each request. Valid implementations are provided as the
constants defined by gdata.auth.OAuthSignatureMethod. Currently
they are gdata.auth.OAuthSignatureMethod.RSA_SHA1 and
gdata.auth.OAuthSignatureMethod.HMAC_SHA1. Instead of passing in
the strategy class, you may pass in a string for 'RSA_SHA1' or
'HMAC_SHA1'. If you plan to use OAuth on App Engine (or another
WSGI environment) I recommend specifying signature method using a
string (the only options are 'RSA_SHA1' and 'HMAC_SHA1'). In these
environments there are sometimes issues with pickling an object in
which a member references a class or function. Storing a string to
refer to the signature method mitigates complications when
pickling.
consumer_key: string Domain identifying third_party web application.
consumer_secret: string (optional) Secret generated during registration.
Required only for HMAC_SHA1 signature method.
rsa_key: string (optional) Private key required for RSA_SHA1 signature
method.
requestor_id: string (optional) User email adress to make requests on
their behalf. This parameter should only be set when performing
2 legged OAuth requests.
"""
if (signature_method == OAuthSignatureMethod.RSA_SHA1
or signature_method == 'RSA_SHA1'):
self.__signature_strategy = 'RSA_SHA1'
elif (signature_method == OAuthSignatureMethod.HMAC_SHA1
or signature_method == 'HMAC_SHA1'):
self.__signature_strategy = 'HMAC_SHA1'
else:
self.__signature_strategy = signature_method
self.rsa_key = rsa_key
self._consumer = oauth.OAuthConsumer(consumer_key, consumer_secret)
self.requestor_id = requestor_id
def __get_signature_method(self):
if self.__signature_strategy == 'RSA_SHA1':
return OAuthSignatureMethod.RSA_SHA1(self.rsa_key, None)
elif self.__signature_strategy == 'HMAC_SHA1':
return OAuthSignatureMethod.HMAC_SHA1()
else:
return self.__signature_strategy()
def __set_signature_method(self, signature_method):
if (signature_method == OAuthSignatureMethod.RSA_SHA1
or signature_method == 'RSA_SHA1'):
self.__signature_strategy = 'RSA_SHA1'
elif (signature_method == OAuthSignatureMethod.HMAC_SHA1
or signature_method == 'HMAC_SHA1'):
self.__signature_strategy = 'HMAC_SHA1'
else:
self.__signature_strategy = signature_method
_signature_method = property(__get_signature_method, __set_signature_method,
doc="""Returns object capable of signing the request using RSA of HMAC.
Replaces the _signature_method member to avoid pickle errors.""")
def GetSignatureMethod(self):
"""Gets the OAuth signature method.
Returns:
object of supertype <oauth.oauth.OAuthSignatureMethod>
"""
return self._signature_method
def GetConsumer(self):
"""Gets the OAuth consumer.
Returns:
object of type <oauth.oauth.Consumer>
"""
return self._consumer
class ClientLoginToken(atom.http_interface.GenericToken):
"""Stores the Authorization header in auth_header and adds to requests.
This token will add it's Authorization header to an HTTP request
as it is made. Ths token class is simple but
some Token classes must calculate portions of the Authorization header
based on the request being made, which is why the token is responsible
for making requests via an http_client parameter.
Args:
auth_header: str The value for the Authorization header.
scopes: list of str or atom.url.Url specifying the beginnings of URLs
for which this token can be used. For example, if scopes contains
'http://example.com/foo', then this token can be used for a request to
'http://example.com/foo/bar' but it cannot be used for a request to
'http://example.com/baz'
"""
def __init__(self, auth_header=None, scopes=None):
self.auth_header = auth_header
self.scopes = scopes or []
def __str__(self):
return self.auth_header
def perform_request(self, http_client, operation, url, data=None,
headers=None):
"""Sets the Authorization header and makes the HTTP request."""
if headers is None:
headers = {'Authorization':self.auth_header}
else:
headers['Authorization'] = self.auth_header
return http_client.request(operation, url, data=data, headers=headers)
def get_token_string(self):
"""Removes PROGRAMMATIC_AUTH_LABEL to give just the token value."""
return self.auth_header[len(PROGRAMMATIC_AUTH_LABEL):]
def set_token_string(self, token_string):
self.auth_header = '%s%s' % (PROGRAMMATIC_AUTH_LABEL, token_string)
def valid_for_scope(self, url):
"""Tells the caller if the token authorizes access to the desired URL.
"""
if isinstance(url, (str, unicode)):
url = atom.url.parse_url(url)
for scope in self.scopes:
if scope == atom.token_store.SCOPE_ALL:
return True
if isinstance(scope, (str, unicode)):
scope = atom.url.parse_url(scope)
if scope == url:
return True
# Check the host and the path, but ignore the port and protocol.
elif scope.host == url.host and not scope.path:
return True
elif scope.host == url.host and scope.path and not url.path:
continue
elif scope.host == url.host and url.path.startswith(scope.path):
return True
return False
class AuthSubToken(ClientLoginToken):
def get_token_string(self):
"""Removes AUTHSUB_AUTH_LABEL to give just the token value."""
return self.auth_header[len(AUTHSUB_AUTH_LABEL):]
def set_token_string(self, token_string):
self.auth_header = '%s%s' % (AUTHSUB_AUTH_LABEL, token_string)
class OAuthToken(atom.http_interface.GenericToken):
"""Stores the token key, token secret and scopes for which token is valid.
This token adds the authorization header to each request made. It
re-calculates authorization header for every request since the OAuth
signature to be added to the authorization header is dependent on the
request parameters.
Attributes:
key: str The value for the OAuth token i.e. token key.
secret: str The value for the OAuth token secret.
scopes: list of str or atom.url.Url specifying the beginnings of URLs
for which this token can be used. For example, if scopes contains
'http://example.com/foo', then this token can be used for a request to
'http://example.com/foo/bar' but it cannot be used for a request to
'http://example.com/baz'
oauth_input_params: OAuthInputParams OAuth input parameters.
"""
def __init__(self, key=None, secret=None, scopes=None,
oauth_input_params=None):
self.key = key
self.secret = secret
self.scopes = scopes or []
self.oauth_input_params = oauth_input_params
def __str__(self):
return self.get_token_string()
def get_token_string(self):
"""Returns the token string.
The token string returned is of format
oauth_token=[0]&oauth_token_secret=[1], where [0] and [1] are some strings.
Returns:
A token string of format oauth_token=[0]&oauth_token_secret=[1],
where [0] and [1] are some strings. If self.secret is absent, it just
returns oauth_token=[0]. If self.key is absent, it just returns
oauth_token_secret=[1]. If both are absent, it returns None.
"""
if self.key and self.secret:
return urllib.urlencode({'oauth_token': self.key,
'oauth_token_secret': self.secret})
elif self.key:
return 'oauth_token=%s' % self.key
elif self.secret:
return 'oauth_token_secret=%s' % self.secret
else:
return None
def set_token_string(self, token_string):
"""Sets the token key and secret from the token string.
Args:
token_string: str Token string of form
oauth_token=[0]&oauth_token_secret=[1]. If oauth_token is not present,
self.key will be None. If oauth_token_secret is not present,
self.secret will be None.
"""
token_params = cgi.parse_qs(token_string, keep_blank_values=False)
if 'oauth_token' in token_params:
self.key = token_params['oauth_token'][0]
if 'oauth_token_secret' in token_params:
self.secret = token_params['oauth_token_secret'][0]
def GetAuthHeader(self, http_method, http_url, realm=''):
"""Get the authentication header.
Args:
http_method: string HTTP method i.e. operation e.g. GET, POST, PUT, etc.
http_url: string or atom.url.Url HTTP URL to which request is made.
realm: string (default='') realm parameter to be included in the
authorization header.
Returns:
dict Header to be sent with every subsequent request after
authentication.
"""
if isinstance(http_url, types.StringTypes):
http_url = atom.url.parse_url(http_url)
header = None
token = None
if self.key or self.secret:
token = oauth.OAuthToken(self.key, self.secret)
oauth_request = oauth.OAuthRequest.from_consumer_and_token(
self.oauth_input_params.GetConsumer(), token=token,
http_url=str(http_url), http_method=http_method,
parameters=http_url.params)
oauth_request.sign_request(self.oauth_input_params.GetSignatureMethod(),
self.oauth_input_params.GetConsumer(), token)
header = oauth_request.to_header(realm=realm)
header['Authorization'] = header['Authorization'].replace('+', '%2B')
return header
def perform_request(self, http_client, operation, url, data=None,
headers=None):
"""Sets the Authorization header and makes the HTTP request."""
if not headers:
headers = {}
if self.oauth_input_params.requestor_id:
url.params['xoauth_requestor_id'] = self.oauth_input_params.requestor_id
headers.update(self.GetAuthHeader(operation, url))
return http_client.request(operation, url, data=data, headers=headers)
def valid_for_scope(self, url):
if isinstance(url, (str, unicode)):
url = atom.url.parse_url(url)
for scope in self.scopes:
if scope == atom.token_store.SCOPE_ALL:
return True
if isinstance(scope, (str, unicode)):
scope = atom.url.parse_url(scope)
if scope == url:
return True
# Check the host and the path, but ignore the port and protocol.
elif scope.host == url.host and not scope.path:
return True
elif scope.host == url.host and scope.path and not url.path:
continue
elif scope.host == url.host and url.path.startswith(scope.path):
return True
return False
class SecureAuthSubToken(AuthSubToken):
"""Stores the rsa private key, token, and scopes for the secure AuthSub token.
This token adds the authorization header to each request made. It
re-calculates authorization header for every request since the secure AuthSub
signature to be added to the authorization header is dependent on the
request parameters.
Attributes:
rsa_key: string The RSA private key in PEM format that the token will
use to sign requests
token_string: string (optional) The value for the AuthSub token.
scopes: list of str or atom.url.Url specifying the beginnings of URLs
for which this token can be used. For example, if scopes contains
'http://example.com/foo', then this token can be used for a request to
'http://example.com/foo/bar' but it cannot be used for a request to
'http://example.com/baz'
"""
def __init__(self, rsa_key, token_string=None, scopes=None):
self.rsa_key = keyfactory.parsePEMKey(rsa_key)
self.token_string = token_string or ''
self.scopes = scopes or []
def __str__(self):
return self.get_token_string()
def get_token_string(self):
return str(self.token_string)
def set_token_string(self, token_string):
self.token_string = token_string
def GetAuthHeader(self, http_method, http_url):
"""Generates the Authorization header.
The form of the secure AuthSub Authorization header is
Authorization: AuthSub token="token" sigalg="sigalg" data="data" sig="sig"
and data represents a string in the form
data = http_method http_url timestamp nonce
Args:
http_method: string HTTP method i.e. operation e.g. GET, POST, PUT, etc.
http_url: string or atom.url.Url HTTP URL to which request is made.
Returns:
dict Header to be sent with every subsequent request after authentication.
"""
timestamp = int(math.floor(time.time()))
nonce = '%lu' % random.randrange(1, 2**64)
data = '%s %s %d %s' % (http_method, str(http_url), timestamp, nonce)
sig = cryptomath.bytesToBase64(self.rsa_key.hashAndSign(data))
header = {'Authorization': '%s"%s" data="%s" sig="%s" sigalg="rsa-sha1"' %
(AUTHSUB_AUTH_LABEL, self.token_string, data, sig)}
return header
def perform_request(self, http_client, operation, url, data=None,
headers=None):
"""Sets the Authorization header and makes the HTTP request."""
if not headers:
headers = {}
headers.update(self.GetAuthHeader(operation, url))
return http_client.request(operation, url, data=data, headers=headers)