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# -- coding: utf-8 -- """ oauthlib.oauth2.rfc6749.parameters ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This module contains methods related to `Section 4`_ of the OAuth 2 RFC. .. _`Section 4`: http://tools.ietf.org/html/rfc6749#section-4 """ from __future__ import absolute_import, unicode_literals import json import os import time from oauthlib.common import add_params_to_qs, add_params_to_uri, unicode_type from oauthlib.signals import scope_changed from .errors import (InsecureTransportError, MismatchingStateError, MissingCodeError, MissingTokenError, MissingTokenTypeError, raise_from_error) from .tokens import OAuth2Token from .utils import is_secure_transport, list_to_scope, scope_to_list try: import urlparse except ImportError: import urllib.parse as urlparse def prepare_grant_uri(uri, client_id, response_type, redirect_uri=None, scope=None, state=None, kwargs): """Prepare the authorization grant request URI. The client constructs the request URI by adding the following parameters to the query component of the authorization endpoint URI using the ``application/x-www-form-urlencoded`` format as defined by [`W3C.REC-html401-19991224`_]: :param response_type: To indicate which OAuth 2 grant/flow is required, "code" and "token". :param client_id: The client identifier as described in `Section 2.2`_. :param redirect_uri: The client provided URI to redirect back to after authorization as described in `Section 3.1.2`_. :param scope: The scope of the access request as described by `Section 3.3`_. :param state: An opaque value used by the client to maintain state between the request and callback. The authorization server includes this value when redirecting the user-agent back to the client. The parameter SHOULD be used for preventing cross-site request forgery as described in `Section 10.12`_. :param kwargs: Extra arguments to embed in the grant/authorization URL. An example of an authorization code grant authorization URL: .. code-block:: http GET /authorize?response_type=code&client_id=s6BhdRkqt3&state=xyz &redirect_uri=https%3A%2F%2Fclient%2Eexample%2Ecom%2Fcb HTTP/1.1 Host: server.example.com .. _`W3C.REC-html401-19991224`: http://tools.ietf.org/html/rfc6749#ref-W3C.REC-html401-19991224 .. _`Section 2.2`: http://tools.ietf.org/html/rfc6749#section-2.2 .. _`Section 3.1.2`: http://tools.ietf.org/html/rfc6749#section-3.1.2 .. _`Section 3.3`: http://tools.ietf.org/html/rfc6749#section-3.3 .. _`section 10.12`: http://tools.ietf.org/html/rfc6749#section-10.12 """ if not is_secure_transport(uri): raise InsecureTransportError() params = [(('response_type', response_type)), (('client_id', client_id))] if redirect_uri: params.append(('redirect_uri', redirect_uri)) if scope: params.append(('scope', list_to_scope(scope))) if state: params.append(('state', state)) for k in kwargs: if kwargs[k]: params.append((unicode_type(k), kwargs[k])) return add_params_to_uri(uri, params) def prepare_token_request(grant_type, body='', kwargs): """Prepare the access token request. The client makes a request to the token endpoint by adding the following parameters using the ``application/x-www-form-urlencoded`` format in the HTTP request entity-body: :param grant_type: To indicate grant type being used, i.e. "password", "authorization_code" or "client_credentials". :param body: Existing request body to embed parameters in. :param code: If using authorization code grant, pass the previously obtained authorization code as the ``code`` argument. :param redirect_uri: If the "redirect_uri" parameter was included in the authorization request as described in `Section 4.1.1`_, and their values MUST be identical. :param kwargs: Extra arguments to embed in the request body. An example of an authorization code token request body: .. code-block:: http grant_type=authorization_code&code=SplxlOBeZQQYbYS6WxSbIA &redirect_uri=https%3A%2F%2Fclient%2Eexample%2Ecom%2Fcb .. _`Section 4.1.1`: http://tools.ietf.org/html/rfc6749#section-4.1.1 """ params = [('grant_type', grant_type)] if 'scope' in kwargs: kwargs['scope'] = list_to_scope(kwargs['scope']) for k in kwargs: if kwargs[k]: params.append((unicode_type(k), kwargs[k])) return add_params_to_qs(body, params) def prepare_token_revocation_request(url, token, token_type_hint="access_token", callback=None, body='', *kwargs): """Prepare a token revocation request. The client constructs the request by including the following parameters using the "application/x-www-form-urlencoded" format in the HTTP request entity-body: token REQUIRED. The token that the client wants to get revoked. token_type_hint OPTIONAL. A hint about the type of the token submitted for revocation. Clients MAY pass this parameter in order to help the authorization server to optimize the token lookup. If the server is unable to locate the token using the given hint, it MUST extend its search across all of its supported token types. An authorization server MAY ignore this parameter, particularly if it is able to detect the token type automatically. This specification defines two such values: access_token: An access token as defined in [RFC6749], `Section 1.4`_ * refresh_token: A refresh token as defined in [RFC6749], `Section 1.5`_ Specific implementations, profiles, and extensions of this specification MAY define other values for this parameter using the registry defined in `Section 4.1.2`_. .. _`Section 1.4`: http://tools.ietf.org/html/rfc6749#section-1.4 .. _`Section 1.5`: http://tools.ietf.org/html/rfc6749#section-1.5 .. _`Section 4.1.2`: http://tools.ietf.org/html/rfc7009#section-4.1.2 """ if not is_secure_transport(url): raise InsecureTransportError() params = [('token', token)] if token_type_hint: params.append(('token_type_hint', token_type_hint)) for k in kwargs: if kwargs[k]: params.append((unicode_type(k), kwargs[k])) headers = {'Content-Type': 'application/x-www-form-urlencoded'} if callback: params.append(('callback', callback)) return add_params_to_uri(url, params), headers, body else: return url, headers, add_params_to_qs(body, params) def parse_authorization_code_response(uri, state=None): """Parse authorization grant response URI into a dict. If the resource owner grants the access request, the authorization server issues an authorization code and delivers it to the client by adding the following parameters to the query component of the redirection URI using the ``application/x-www-form-urlencoded`` format: code REQUIRED. The authorization code generated by the authorization server. The authorization code MUST expire shortly after it is issued to mitigate the risk of leaks. A maximum authorization code lifetime of 10 minutes is RECOMMENDED. The client MUST NOT use the authorization code more than once. If an authorization code is used more than once, the authorization server MUST deny the request and SHOULD revoke (when possible) all tokens previously issued based on that authorization code. The authorization code is bound to the client identifier and redirection URI. state REQUIRED if the "state" parameter was present in the client authorization request. The exact value received from the client. :param uri: The full redirect URL back to the client. :param state: The state parameter from the authorization request. For example, the authorization server redirects the user-agent by sending the following HTTP response: .. code-block:: http HTTP/1.1 302 Found Location: https://client.example.com/cb?code=SplxlOBeZQQYbYS6WxSbIA &state=xyz """ if not is_secure_transport(uri): raise InsecureTransportError() query = urlparse.urlparse(uri).query params = dict(urlparse.parse_qsl(query)) if not 'code' in params: raise MissingCodeError("Missing code parameter in response.") if state and params.get('state', None) != state: raise MismatchingStateError() return params def parse_implicit_response(uri, state=None, scope=None): """Parse the implicit token response URI into a dict. If the resource owner grants the access request, the authorization server issues an access token and delivers it to the client by adding the following parameters to the fragment component of the redirection URI using the ``application/x-www-form-urlencoded`` format: access_token REQUIRED. The access token issued by the authorization server. token_type REQUIRED. The type of the token issued as described in Section 7.1. Value is case insensitive. expires_in RECOMMENDED. The lifetime in seconds of the access token. For example, the value "3600" denotes that the access token will expire in one hour from the time the response was generated. If omitted, the authorization server SHOULD provide the expiration time via other means or document the default value. scope OPTIONAL, if identical to the scope requested by the client, otherwise REQUIRED. The scope of the access token as described by Section 3.3. state REQUIRED if the "state" parameter was present in the client authorization request. The exact value received from the client. Similar to the authorization code response, but with a full token provided in the URL fragment: .. code-block:: http HTTP/1.1 302 Found Location: http://example.com/cb#access_token=2YotnFZFEjr1zCsicMWpAA &state=xyz&token_type=example&expires_in=3600 """ if not is_secure_transport(uri): raise InsecureTransportError() fragment = urlparse.urlparse(uri).fragment params = dict(urlparse.parse_qsl(fragment, keep_blank_values=True)) if 'scope' in params: params['scope'] = scope_to_list(params['scope']) if 'expires_in' in params: params['expires_at'] = time.time() + int(params['expires_in']) if state and params.get('state', None) != state: raise ValueError("Mismatching or missing state in params.") params = OAuth2Token(params, old_scope=scope) validate_token_parameters(params) return params def parse_token_response(body, scope=None): """Parse the JSON token response body into a dict. The authorization server issues an access token and optional refresh token, and constructs the response by adding the following parameters to the entity body of the HTTP response with a 200 (OK) status code: access_token REQUIRED. The access token issued by the authorization server. token_type REQUIRED. The type of the token issued as described in `Section 7.1`_. Value is case insensitive. expires_in RECOMMENDED. The lifetime in seconds of the access token. For example, the value "3600" denotes that the access token will expire in one hour from the time the response was generated. If omitted, the authorization server SHOULD provide the expiration time via other means or document the default value. refresh_token OPTIONAL. The refresh token which can be used to obtain new access tokens using the same authorization grant as described in `Section 6`_. scope OPTIONAL, if identical to the scope requested by the client, otherwise REQUIRED. The scope of the access token as described by `Section 3.3`_. The parameters are included in the entity body of the HTTP response using the "application/json" media type as defined by [`RFC4627`_]. The parameters are serialized into a JSON structure by adding each parameter at the highest structure level. Parameter names and string values are included as JSON strings. Numerical values are included as JSON numbers. The order of parameters does not matter and can vary. :param body: The full json encoded response body. :param scope: The scope requested during authorization. For example: .. code-block:: http HTTP/1.1 200 OK Content-Type: application/json Cache-Control: no-store Pragma: no-cache { "access_token":"2YotnFZFEjr1zCsicMWpAA", "token_type":"example", "expires_in":3600, "refresh_token":"tGzv3JOkF0XG5Qx2TlKWIA", "example_parameter":"example_value" } .. _`Section 7.1`: http://tools.ietf.org/html/rfc6749#section-7.1 .. _`Section 6`: http://tools.ietf.org/html/rfc6749#section-6 .. _`Section 3.3`: http://tools.ietf.org/html/rfc6749#section-3.3 .. _`RFC4627`: http://tools.ietf.org/html/rfc4627 """ try: params = json.loads(body) except ValueError: # Fall back to URL-encoded string, to support old implementations, # including (at time of writing) Facebook. See: # https://github.com/idan/oauthlib/issues/267 params = dict(urlparse.parse_qsl(body)) for key in ('expires_in', 'expires'): if key in params: # cast a couple things to int params[key] = int(params[key]) if 'scope' in params: params['scope'] = scope_to_list(params['scope']) if 'expires' in params: params['expires_in'] = params.pop('expires') if 'expires_in' in params: params['expires_at'] = time.time() + int(params['expires_in']) params = OAuth2Token(params, old_scope=scope) validate_token_parameters(params) return params def validate_token_parameters(params): """Ensures token precence, token type, expiration and scope in params.""" if 'error' in params: raise_from_error(params.get('error'), params) if not 'access_token' in params: raise MissingTokenError(description="Missing access token parameter.") if not 'token_type' in params: if os.environ.get('OAUTHLIB_STRICT_TOKEN_TYPE'): raise MissingTokenTypeError() # If the issued access token scope is different from the one requested by # the client, the authorization server MUST include the "scope" response # parameter to inform the client of the actual scope granted. # http://tools.ietf.org/html/rfc6749#section-3.3 if params.scope_changed: message = 'Scope has changed from "{old}" to "{new}".'.format( old=params.old_scope, new=params.scope, ) scope_changed.send(message=message, old=params.old_scopes, new=params.scopes) if not os.environ.get('OAUTHLIB_RELAX_TOKEN_SCOPE', None): w = Warning(message) w.token = params w.old_scope = params.old_scopes w.new_scope = params.scopes raise w

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