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oauthlib
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oauth2
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rfc6749
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clients
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base.py
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# -*- coding: utf-8 -*- """ oauthlib.oauth2.rfc6749 ~~~~~~~~~~~~~~~~~~~~~~~ This module is an implementation of various logic needed for consuming OAuth 2.0 RFC6749. """ from __future__ import absolute_import, unicode_literals import time from oauthlib.common import generate_token from oauthlib.oauth2.rfc6749 import tokens from oauthlib.oauth2.rfc6749.parameters import parse_token_response from oauthlib.oauth2.rfc6749.parameters import prepare_token_request from oauthlib.oauth2.rfc6749.parameters import prepare_token_revocation_request from oauthlib.oauth2.rfc6749.errors import TokenExpiredError from oauthlib.oauth2.rfc6749.errors import InsecureTransportError from oauthlib.oauth2.rfc6749.utils import is_secure_transport AUTH_HEADER = 'auth_header' URI_QUERY = 'query' BODY = 'body' FORM_ENC_HEADERS = { 'Content-Type': 'application/x-www-form-urlencoded' } class Client(object): """Base OAuth2 client responsible for access token management. This class also acts as a generic interface providing methods common to all client types such as ``prepare_authorization_request`` and ``prepare_token_revocation_request``. The ``prepare_x_request`` methods are the recommended way of interacting with clients (as opposed to the abstract prepare uri/body/etc methods). They are recommended over the older set because they are easier to use (more consistent) and add a few additional security checks, such as HTTPS and state checking. Some of these methods require further implementation only provided by the specific purpose clients such as :py:class:`oauthlib.oauth2.MobileApplicationClient` and thus you should always seek to use the client class matching the OAuth workflow you need. For Python, this is usually :py:class:`oauthlib.oauth2.WebApplicationClient`. """ def __init__(self, client_id, default_token_placement=AUTH_HEADER, token_type='Bearer', access_token=None, refresh_token=None, mac_key=None, mac_algorithm=None, token=None, scope=None, state=None, redirect_url=None, state_generator=generate_token, **kwargs): """Initialize a client with commonly used attributes. :param client_id: Client identifier given by the OAuth provider upon registration. :param default_token_placement: Tokens can be supplied in the Authorization header (default), the URL query component (``query``) or the request body (``body``). :param token_type: OAuth 2 token type. Defaults to Bearer. Change this if you specify the ``access_token`` parameter and know it is of a different token type, such as a MAC, JWT or SAML token. Can also be supplied as ``token_type`` inside the ``token`` dict parameter. :param access_token: An access token (string) used to authenticate requests to protected resources. Can also be supplied inside the ``token`` dict parameter. :param refresh_token: A refresh token (string) used to refresh expired tokens. Can also be supplide inside the ``token`` dict parameter. :param mac_key: Encryption key used with MAC tokens. :param mac_algorithm: Hashing algorithm for MAC tokens. :param token: A dict of token attributes such as ``access_token``, ``token_type`` and ``expires_at``. :param scope: A list of default scopes to request authorization for. :param state: A CSRF protection string used during authorization. :param redirect_url: The redirection endpoint on the client side to which the user returns after authorization. :param state_generator: A no argument state generation callable. Defaults to :py:meth:`oauthlib.common.generate_token`. """ self.client_id = client_id self.default_token_placement = default_token_placement self.token_type = token_type self.access_token = access_token self.refresh_token = refresh_token self.mac_key = mac_key self.mac_algorithm = mac_algorithm self.token = token or {} self.scope = scope self.state_generator = state_generator self.state = state self.redirect_url = redirect_url self._expires_at = None self._populate_attributes(self.token) @property def token_types(self): """Supported token types and their respective methods Additional tokens can be supported by extending this dictionary. The Bearer token spec is stable and safe to use. The MAC token spec is not yet stable and support for MAC tokens is experimental and currently matching version 00 of the spec. """ return { 'Bearer': self._add_bearer_token, 'MAC': self._add_mac_token } def prepare_request_uri(self, *args, **kwargs): """Abstract method used to create request URIs.""" raise NotImplementedError("Must be implemented by inheriting classes.") def prepare_request_body(self, *args, **kwargs): """Abstract method used to create request bodies.""" raise NotImplementedError("Must be implemented by inheriting classes.") def parse_request_uri_response(self, *args, **kwargs): """Abstract method used to parse redirection responses.""" def add_token(self, uri, http_method='GET', body=None, headers=None, token_placement=None, **kwargs): """Add token to the request uri, body or authorization header. The access token type provides the client with the information required to successfully utilize the access token to make a protected resource request (along with type-specific attributes). The client MUST NOT use an access token if it does not understand the token type. For example, the "bearer" token type defined in [`I-D.ietf-oauth-v2-bearer`_] is utilized by simply including the access token string in the request: .. code-block:: http GET /resource/1 HTTP/1.1 Host: example.com Authorization: Bearer mF_9.B5f-4.1JqM while the "mac" token type defined in [`I-D.ietf-oauth-v2-http-mac`_] is utilized by issuing a MAC key together with the access token which is used to sign certain components of the HTTP requests: .. code-block:: http GET /resource/1 HTTP/1.1 Host: example.com Authorization: MAC id="h480djs93hd8", nonce="274312:dj83hs9s", mac="kDZvddkndxvhGRXZhvuDjEWhGeE=" .. _`I-D.ietf-oauth-v2-bearer`: http://tools.ietf.org/html/rfc6749#section-12.2 .. _`I-D.ietf-oauth-v2-http-mac`: http://tools.ietf.org/html/rfc6749#section-12.2 """ if not is_secure_transport(uri): raise InsecureTransportError() token_placement = token_placement or self.default_token_placement case_insensitive_token_types = dict( (k.lower(), v) for k, v in self.token_types.items()) if not self.token_type.lower() in case_insensitive_token_types: raise ValueError("Unsupported token type: %s" % self.token_type) if not self.access_token: raise ValueError("Missing access token.") if self._expires_at and self._expires_at < time.time(): raise TokenExpiredError() return case_insensitive_token_types[self.token_type.lower()](uri, http_method, body, headers, token_placement, **kwargs) def prepare_authorization_request(self, authorization_url, state=None, redirect_url=None, scope=None, **kwargs): """Prepare the authorization request. This is the first step in many OAuth flows in which the user is redirected to a certain authorization URL. This method adds required parameters to the authorization URL. :param authorization_url: Provider authorization endpoint URL. :param state: CSRF protection string. Will be automatically created if not provided. The generated state is available via the ``state`` attribute. Clients should verify that the state is unchanged and present in the authorization response. This verification is done automatically if using the ``authorization_response`` parameter with ``prepare_token_request``. :param redirect_url: Redirect URL to which the user will be returned after authorization. Must be provided unless previously setup with the provider. If provided then it must also be provided in the token request. :param kwargs: Additional parameters to included in the request. :returns: The prepared request tuple with (url, headers, body). """ if not is_secure_transport(authorization_url): raise InsecureTransportError() self.state = state or self.state_generator() self.redirect_url = redirect_url or self.redirect_url self.scope = scope or self.scope auth_url = self.prepare_request_uri( authorization_url, redirect_uri=self.redirect_url, scope=self.scope, state=self.state, **kwargs) return auth_url, FORM_ENC_HEADERS, '' def prepare_token_request(self, token_url, authorization_response=None, redirect_url=None, state=None, body='', **kwargs): """Prepare a token creation request. Note that these requests usually require client authentication, either by including client_id or a set of provider specific authentication credentials. :param token_url: Provider token creation endpoint URL. :param authorization_response: The full redirection URL string, i.e. the location to which the user was redirected after successfull authorization. Used to mine credentials needed to obtain a token in this step, such as authorization code. :param redirect_url: The redirect_url supplied with the authorization request (if there was one). :param body: Request body (URL encoded string). :param kwargs: Additional parameters to included in the request. :returns: The prepared request tuple with (url, headers, body). """ if not is_secure_transport(token_url): raise InsecureTransportError() state = state or self.state if authorization_response: self.parse_request_uri_response( authorization_response, state=state) self.redirect_url = redirect_url or self.redirect_url body = self.prepare_request_body(body=body, redirect_uri=self.redirect_url, **kwargs) return token_url, FORM_ENC_HEADERS, body def prepare_refresh_token_request(self, token_url, refresh_token=None, body='', scope=None, **kwargs): """Prepare an access token refresh request. Expired access tokens can be replaced by new access tokens without going through the OAuth dance if the client obtained a refresh token. This refresh token and authentication credentials can be used to obtain a new access token, and possibly a new refresh token. :param token_url: Provider token refresh endpoint URL. :param refresh_token: Refresh token string. :param body: Request body (URL encoded string). :param scope: List of scopes to request. Must be equal to or a subset of the scopes granted when obtaining the refresh token. :param kwargs: Additional parameters to included in the request. :returns: The prepared request tuple with (url, headers, body). """ if not is_secure_transport(token_url): raise InsecureTransportError() self.scope = scope or self.scope body = self.prepare_refresh_body(body=body, refresh_token=refresh_token, scope=self.scope, **kwargs) return token_url, FORM_ENC_HEADERS, body def prepare_token_revocation_request(self, revocation_url, token, token_type_hint="access_token", body='', callback=None, **kwargs): """Prepare a token revocation request. :param revocation_url: Provider token revocation endpoint URL. :param token: The access or refresh token to be revoked (string). :param token_type_hint: ``"access_token"`` (default) or ``"refresh_token"``. This is optional and if you wish to not pass it you must provide ``token_type_hint=None``. :param callback: A jsonp callback such as ``package.callback`` to be invoked upon receiving the response. Not that it should not include a () suffix. :param kwargs: Additional parameters to included in the request. :returns: The prepared request tuple with (url, headers, body). Note that JSONP request may use GET requests as the parameters will be added to the request URL query as opposed to the request body. An example of a revocation request .. code-block: http POST /revoke HTTP/1.1 Host: server.example.com Content-Type: application/x-www-form-urlencoded Authorization: Basic czZCaGRSa3F0MzpnWDFmQmF0M2JW token=45ghiukldjahdnhzdauz&token_type_hint=refresh_token An example of a jsonp revocation request .. code-block: http GET /revoke?token=agabcdefddddafdd&callback=package.myCallback HTTP/1.1 Host: server.example.com Content-Type: application/x-www-form-urlencoded Authorization: Basic czZCaGRSa3F0MzpnWDFmQmF0M2JW and an error response .. code-block: http package.myCallback({"error":"unsupported_token_type"}); Note that these requests usually require client credentials, client_id in the case for public clients and provider specific authentication credentials for confidential clients. """ if not is_secure_transport(revocation_url): raise InsecureTransportError() return prepare_token_revocation_request(revocation_url, token, token_type_hint=token_type_hint, body=body, callback=callback, **kwargs) def parse_request_body_response(self, body, scope=None, **kwargs): """Parse the JSON response body. If the access token request is valid and authorized, the authorization server issues an access token as described in `Section 5.1`_. A refresh token SHOULD NOT be included. If the request failed client authentication or is invalid, the authorization server returns an error response as described in `Section 5.2`_. :param body: The response body from the token request. :param scope: Scopes originally requested. :return: Dictionary of token parameters. :raises: Warning if scope has changed. OAuth2Error if response is invalid. These response are json encoded and could easily be parsed without the assistance of OAuthLib. However, there are a few subtle issues to be aware of regarding the response which are helpfully addressed through the raising of various errors. A successful response should always contain **access_token** The access token issued by the authorization server. Often a random string. **token_type** The type of the token issued as described in `Section 7.1`_. Commonly ``Bearer``. While it is not mandated it is recommended that the provider include **expires_in** 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** Providers may supply this in all responses but are required to only if it has changed since the authorization request. .. _`Section 5.1`: http://tools.ietf.org/html/rfc6749#section-5.1 .. _`Section 5.2`: http://tools.ietf.org/html/rfc6749#section-5.2 .. _`Section 7.1`: http://tools.ietf.org/html/rfc6749#section-7.1 """ self.token = parse_token_response(body, scope=scope) self._populate_attributes(self.token) return self.token def prepare_refresh_body(self, body='', refresh_token=None, scope=None, **kwargs): """Prepare an access token request, using a refresh token. If the authorization server issued a refresh token to the client, the client makes a refresh request to the token endpoint by adding the following parameters using the "application/x-www-form-urlencoded" format in the HTTP request entity-body: grant_type REQUIRED. Value MUST be set to "refresh_token". refresh_token REQUIRED. The refresh token issued to the client. scope OPTIONAL. The scope of the access request as described by Section 3.3. The requested scope MUST NOT include any scope not originally granted by the resource owner, and if omitted is treated as equal to the scope originally granted by the resource owner. """ refresh_token = refresh_token or self.refresh_token return prepare_token_request('refresh_token', body=body, scope=scope, refresh_token=refresh_token, **kwargs) def _add_bearer_token(self, uri, http_method='GET', body=None, headers=None, token_placement=None): """Add a bearer token to the request uri, body or authorization header.""" if token_placement == AUTH_HEADER: headers = tokens.prepare_bearer_headers(self.access_token, headers) elif token_placement == URI_QUERY: uri = tokens.prepare_bearer_uri(self.access_token, uri) elif token_placement == BODY: body = tokens.prepare_bearer_body(self.access_token, body) else: raise ValueError("Invalid token placement.") return uri, headers, body def _add_mac_token(self, uri, http_method='GET', body=None, headers=None, token_placement=AUTH_HEADER, ext=None, **kwargs): """Add a MAC token to the request authorization header. Warning: MAC token support is experimental as the spec is not yet stable. """ headers = tokens.prepare_mac_header(self.access_token, uri, self.mac_key, http_method, headers=headers, body=body, ext=ext, hash_algorithm=self.mac_algorithm, **kwargs) return uri, headers, body def _populate_attributes(self, response): """Add commonly used values such as access_token to self.""" if 'access_token' in response: self.access_token = response.get('access_token') if 'refresh_token' in response: self.refresh_token = response.get('refresh_token') if 'token_type' in response: self.token_type = response.get('token_type') if 'expires_in' in response: self.expires_in = response.get('expires_in') self._expires_at = time.time() + int(self.expires_in) if 'expires_at' in response: self._expires_at = int(response.get('expires_at')) if 'code' in response: self.code = response.get('code') if 'mac_key' in response: self.mac_key = response.get('mac_key') if 'mac_algorithm' in response: self.mac_algorithm = response.get('mac_algorithm')