astakos: oa2 app

snf-astakos-app/astakos/oa2/backends/__init__.py

+from astakos.oa2.backends.base import SimpleBackend
+from astakos.oa2.backends.djangobackend import *

snf-astakos-app/astakos/oa2/backends/base.py

+import urllib
+import urlparse
+import uuid
+import datetime
+import json
+
+from base64 import b64encode, b64decode
+from hashlib import sha512
+
+import logging
+logger = logging.getLogger(__name__)
+
+
+def handles_oa2_requests(func):
+    def wrapper(self, *args, **kwargs):
+        if not self._errors_to_http:
+            return func(self, *args, **kwargs)
+        try:
+            return func(self, *args, **kwargs)
+        except OA2Error, e:
+            return self.build_response_from_error(e)
+    return wrapper
+
+
+class OA2Error(Exception):
+    error = None
+
+
+class InvalidClientID(OA2Error):
+    pass
+
+
+class NotAuthenticatedError(OA2Error):
+    pass
+
+
+class InvalidClientRedirectUrl(OA2Error):
+    pass
+
+
+class InvalidAuthorizationRequest(OA2Error):
+    pass
+
+
+class Response(object):
+
+    def __init__(self, status, body='', headers=None,
+                 content_type='plain/text'):
+        if not body:
+            body = ''
+        if not headers:
+            headers = {}
+
+        self.status = status
+        self.body = body
+        self.headers = headers
+        self.content_type = content_type
+
+    def __repr__(self):
+        return "%d RESPONSE (BODY: %r, HEADERS: %r)" % (self.status,
+                                                        self.body,
+                                                        self.headers)
+
+
+class Request(object):
+
+    def __init__(self, method, GET=None, POST=None, META=None, secure=False,
+                 user=None):
+        self.method = method
+
+        if not GET:
+            GET = {}
+        if not POST:
+            POST = {}
+        if not META:
+            META = {}
+
+        self.secure = secure
+        self.GET = GET
+        self.POST = POST
+        self.META = META
+        self.user = user
+
+    def __repr__(self):
+        prepend = ""
+        if self.secure:
+            prepend = "SECURE "
+        return "%s%s REQUEST (POST: %r, GET:%r, HEADERS:%r, " % (prepend,
+                                                                 self.method,
+                                                                 self.POST,
+                                                                 self.GET,
+                                                                 self.META)
+
+
+class ORMAbstractBase(type):
+
+    def __new__(cls, name, bases, attrs):
+        attrs['ENTRIES'] = {}
+        return super(ORMAbstractBase, cls).__new__(cls, name, bases, attrs)
+
+
+class ORMAbstract(object):
+
+    ENTRIES = {}
+
+    __metaclass__ = ORMAbstractBase
+
+    def __init__(self, **kwargs):
+        for key, value in kwargs.iteritems():
+            setattr(self, key, value)
+
+    @classmethod
+    def create(cls, id, **params):
+        params = cls.clean_params(params)
+        params['id'] = id
+        cls.ENTRIES[id] = cls(**params)
+        return cls.get(id)
+
+    @classmethod
+    def get(cls, pk):
+        return cls.ENTRIES.get(pk)
+
+    @classmethod
+    def clean_params(cls, params):
+        return params
+
+
+class Client(ORMAbstract):
+
+    def get_id(self):
+        return self.id
+
+    def get_redirect_uris(self):
+        return self.uris
+
+    def get_default_redirect_uri(self):
+        return self.uris[0]
+
+    def redirect_uri_is_valid(self, redirect_uri):
+        split = urlparse.urlsplit(redirect_uri)
+        if split.scheme not in urlparse.uses_query:
+            raise OA2Error("Invalid redirect url scheme")
+        uris = self.get_redirect_uris()
+        return redirect_uri in uris
+
+    def requires_auth(self):
+        if self.client_type == 'confidential':
+            return True
+        return 'secret' in dir(self)
+
+    def check_credentials(self, username, secret):
+        return username == self.id and secret == self.secret
+
+
+class Token(ORMAbstract):
+
+    def to_dict(self):
+        params = {
+            'access_token': self.token,
+            'token_type': self.token_type,
+            'expires_in': self.expires,
+        }
+        if self.refresh_token:
+            params['refresh_token'] = self.refresh_token
+        return params
+
+
+class AuthorizationCode(ORMAbstract):
+    pass
+
+
+class User(ORMAbstract):
+    pass
+
+
+class BackendBase(type):
+
+    def __new__(cls, name, bases, attrs):
+        super_new = super(BackendBase, cls).__new__
+        parents = [b for b in bases if isinstance(b, BackendBase)]
+        meta = attrs.pop('Meta', None)
+        return super_new(cls, name, bases, attrs)
+
+    @classmethod
+    def get_orm_options(cls, attrs):
+        meta = attrs.pop('ORM', None)
+        orm = {}
+        if meta:
+            for attr in dir(meta):
+                orm[attr] = getattr(meta, attr)
+        return orm
+
+
+class SimpleBackend(object):
+
+    __metaclass__ = BackendBase
+
+    base_url = ''
+    endpoints_prefix = '/oa2/'
+
+    token_endpoint = 'token/'
+    token_length = 30
+    token_expires = 3600
+
+    authorization_endpoint = 'auth/'
+    authorization_code_length = 60
+    authorization_response_types = ['code', 'token']
+
+    grant_types = ['authorization_code', 'implicit']
+
+    response_cls = Response
+    request_cls = Request
+
+    client_model = Client
+    token_model = Token
+    code_model = AuthorizationCode
+    user_model = User
+
+    def __init__(self, base_url='', endpoints_prefix='/oa2/', id='oa2',
+                 **kwargs):
+        self.base_url = base_url
+        self.endpoints_prefix = endpoints_prefix
+        self.id = id
+        self._errors_to_http = kwargs.get('errors_to_http', True)
+
+    # Request/response builders
+    def build_request(self, method, get, post, meta):
+        return self.request_cls(method=method, GET=get, POST=post, META=meta)
+
+    def build_response(self, status, headers=None, body=''):
+        return self.response_cls(status=status, headers=headers, body=body)
+
+    # ORM Methods
+    def create_authorization_code(self, client, code, redirect_uri, scope,
+                                  state, **kwargs):
+        code_params = {
+            'code': code,
+            'redirect_uri': redirect_uri,
+            'client_id': client.get_id(),
+            'scope': scope,
+            'state': state
+        }
+        code_params.update(kwargs)
+        return self.code_model.create(code, **code_params)
+
+    def _token_params(self, value, token_type, client, scope):
+        created_at = datetime.datetime.now()
+        expires = self.token_expires
+        expires_at = created_at + datetime.timedelta(seconds=expires)
+        token_params = {
+            'token': value,
+            'token_type': token_type,
+            'client': client,
+            'scope': scope,
+            'created_at': created_at,
+            'expires': expires,
+            'expires_at': expires_at
+        }
+        return token_params
+
+    def create_token(self, value, token_type, client, scope, refresh=False):
+        params = self._token_params(value, token_type, client, scope)
+        if refresh:
+            refresh_token = self.generate_token()
+            params['refresh_token'] = refresh_token
+            # TODO: refresh token expires ???
+        token = self.token_model.create(value, **params)
+
+    def delete_authorization_code(self, code):
+        del self.code_model.ENTRIES[code]
+
+    def get_client_by_id(self, client_id):
+        return self.client_model.get(client_id)
+
+    def get_client_by_credentials(self, username, password):
+        return None
+
+    def get_authorization_code(self, code):
+        return self.code_model.get(code)
+
+    def get_client_authorization_code(self, client, code):
+        code_instance = self.get_authorization_code(code)
+        if not code_instance:
+            raise OA2Error("Invalid code", code)
+
+        if client.id != code_instance.client_id:
+            raise OA2Error("Invalid code for client", code, client)
+        return code_instance
+
+    def client_id_exists(self, client_id):
+        return bool(self.get_client_by_id(client_id))
+
+    def build_site_url(self, prefix='', **params):
+        params = urllib.urlencode(params)
+        return "%s%s%s%s" % (self.base_url, self.endpoints_prefix, prefix,
+                             params)
+
+    def _get_uri_base(self, uri):
+        split = urlparse.urlsplit(uri)
+        return "%s://%s%s" % (split.scheme, split.netloc, split.path)
+
+    def build_client_redirect_uri(self, client, uri, **params):
+        if not client.redirect_uri_is_valid(uri):
+            raise OA2Error("Invalid redirect uri")
+        params = urllib.urlencode(params)
+        uri = self._get_uri_base(uri)
+        return "%s?%s" % (uri, params)
+
+    def generate_authorization_code(self):
+        dg64 = b64encode(sha512(str(uuid.uuid4())).hexdigest())
+        return dg64[:self.authorization_code_length]
+
+    def generate_token(self, *args, **kwargs):
+        dg64 = b64encode(sha512(str(uuid.uuid4())).hexdigest())
+        return dg64[:self.token_length]
+
+    def add_authorization_code(self, user, client, redirect_uri, scope, state,
+                               **kwargs):
+        code = self.generate_authorization_code()
+        self.create_authorization_code(user, client, code, redirect_uri, scope,
+                                       state, **kwargs)
+        return code
+
+    #
+    # Response helpers
+    #
+
+    def grant_accept_response(self, client, redirect_uri, scope, state,
+                              request):
+        context = {'client': client.get_id(), 'redirect_uri': redirect_uri,
+                   'scope': scope, 'state': state, 'url': url}
+        json_content = json.dumps(context)
+        return self.response_cls(status=200, body=json_content)
+
+    def build_redirect_to_login_response(self, request):
+        return Response(302, headers={'Location': '/login'})
+
+    def build_response_from_error(self, exception):
+        response = Response(400)
+        logger.exception(exception)
+        error = 'generic_error'
+        if exception.error:
+            error = exception.error
+        body = {
+            'error': error,
+            'exception': exception.message,
+        }
+        response.body = json.dumps(body)
+        response.content_type = "application/json"
+        return response
+
+    #
+    # Processor methods
+    #
+
+    def grant_authorization_code(self, user, client, code, redirect_uri,
+                                 scope):
+        code = self.get_client_authorization_code(client, code)
+        if code.scope != scope:
+            raise OA2Error("Invalid scope")
+        token = self.add_token_for_client(client, "Bearer", code.scope,
+                                          refresh=True)
+        self.delete_authorization_code(code.code)
+        return token
+
+
+    #
+    # Helpers
+    #
+
+    def _get_credentials(self, params, headers):
+        if 'HTTP_AUTHORIZATION' in headers:
+            scheme, b64credentials = headers.get(
+                'HTTP_AUTHORIZATION').split(" ")
+            credentials = b64decode(b64credentials).split(":")
+            return scheme, credentials
+        else:
+            return None, None
+        pass
+
+    def get_redirect_uri_from_params(self, client, params, default=True):
+        """
+        Accepts a client instance and request parameters.
+        """
+        redirect_uri = params.get('redirect_uri', None)
+        if not redirect_uri and default:
+            redirect_uri = client.get_default_redirect_uri()
+        else:
+            # TODO: sanitize redirect_uri (self.clean_redirect_uri ???)
+            # clean and validate
+            if not client.redirect_uri_is_valid(redirect_uri):
+                raise OA2Error("Invalid client redirect uri")
+        return redirect_uri
+
+    #
+    # Parameters validation methods
+    #
+
+    def validate_client(params, meta, requires_auth=False):
+        raise OA2Error("Invalid client")
+
+    def validate_redirect_uri(client, params, headers, allow_default=True):
+        raise OA2Error("Invalid redirect uri")
+
+    def validate_state(params, meta):
+        raise OA2Error("Invalid state")
+
+    def validate_scope(client, params, headers):
+        raise OA2Error("Invalid state")
+
+    #
+    # Requests validation methods
+    #
+
+    def validate_code_request(params, headers):
+        client = self.validate_client(params, headers, False)
+        redirect_uri = self.validate_redirect_uri(client, params, headers)
+        scope = self.validate_scope(client, params, headers)
+        state = self.validate_state(client, params, headers)
+        return client, redirect_uri, scope, state
+
+    def validate_token_request(params, headers):
+        client = self.validate_client(params, headers, False)
+        redirect_uri = self.validate_redirect_uri(client, params, headers)
+        scope = self.validate_scope(client, params, headers)
+        state = self.validate_state(client, params, headers)
+        return client, redirect_uri, scope, state
+
+    #
+    # Endpoint methods
+    #
+
+    @handles_oa2_requests
+    def authorize(self, request, **extra):
+        """
+        Used in the following cases
+        """
+        if not request.secure:
+            raise OA2Error("Secure request required")
+
+        # identify
+        request_params = request.GET
+        if request.method == "POST":
+            request_params = request.POST
+
+        auth_type, params = self.identify_authorize_request(request_params,
+                                                            request.META)
+
+        if auth_type == 'code':
+            client, uri, scope, state = \
+                    self.validate_code_request(params, request.META)
+        elif auth_type == 'token':
+            client, uri, scope, state = \
+                self.validate_token_request(params, request.META)
+        else:
+            #TODO: handle custom type
+            raise OA2Error("Invalid authorization type")
+
+        user = self.get_user_from_request(request)
+        if not user:
+            return self.redirect_to_login_response(request)
+
+        if request.method == 'POST':
+            if auth_type == 'code':
+                return self.process_code_request(user, client, uri, scope,
+                                                 state)
+            elif auth_type == 'token':
+                return self.process_code_request(user, client, uri, scope,
+                                                 state)
+            else:
+                #TODO: handle custom type
+                raise OA2Error("Invalid authorization type")
+        else:
+            return self.grant_accept_response()

snf-astakos-app/astakos/oa2/backends/djangobackend.py

+from astakos.oa2.backends import base as oa2base
+from astakos.oa2.backends import base as errors
+from astakos.oa2.models import *
+
+from django.conf.urls.defaults import patterns, url
+from django import http
+
+
+class DjangoViewsMixin(object):
+
+    def auth_view(self, request):
+        oa2request = self.build_request(request)
+        response = self.authorize(oa2request, accept=False)
+        return self._build_response(response)
+
+    def token_view(self, request):
+        return http.HttpResponse("token view")
+
+
+class DjangoBackendORMMixin(object):
+
+    def get_client_by_credentials(self, username, password):
+        try:
+            return Client.objects.get(identifier=username, secret=password)
+        except Client.DoesNotExist:
+            raise errors.InvalidClientID("No such client found")
+
+    def get_client_by_id(self, clientid):
+        try:
+            return Client.objects.get(identifier=clientid)
+        except Client.DoesNotExist:
+            raise errors.InvalidClientID("No such client found")
+
+    def create_authorization_code(self, client, code, redirect_uri, scope,
+                                  state, **kwargs):
+        return AuthorizationCode.objects.create(**{
+            'code': code,
+            'client_id': client.get_id(),
+            'redirect_uri': redirect_uri,
+            'scope': scope,
+            'state': state
+        })
+
+    def create_token(self, value, token_type, client, scope, refresh=False):
+        params = self._token_params(value, token_type, client, scope)
+        if refresh:
+            refresh_token = self.generate_token()
+            params['refresh_token'] = refresh_token
+            # TODO: refresh token expires ???
+        token = self.token_model.create(value, **params)
+
+    def delete_authorization_code(self, code):
+        del self.code_model.ENTRIES[code]
+
+
+class DjangoBackend(DjangoBackendORMMixin, oa2base.SimpleBackend,
+                    DjangoViewsMixin):
+
+    code_model = AuthorizationCode
+
+    def _build_response(self, oa2response):
+        response = http.HttpResponse()
+        response.status_code = oa2response.status
+        response.content = oa2response.body
+        for key, value in oa2response.headers.iteritems():
+            response[key] = value
+        return response
+
+    def build_request(self, django_request):
+        params = {
+            'method': django_request.method,
+            'GET': django_request.GET,
+            'POST': django_request.POST,
+            'META': django_request.META,
+            'secure': django_request.is_secure(),
+        }
+        if django_request.user.is_authenticated():
+            params['user'] = django_request.user
+        return oa2base.Request(**params)
+
+    def get_url_patterns(self):
+        _patterns = patterns(
+            '',
+            url(r'^%s/auth/?$' % self.endpoints_prefix, self.auth_view,
+                name='%s_authenticate' % self.id),
+            url(r'^%s/token/?$' % self.endpoints_prefix, self.token_view,
+                name='%s_token' % self.id),
+        )
+        return _patterns
+
+
+class AstakosBackend(DjangoBackend):
+    pass

snf-astakos-app/astakos/oa2/models.py

+from django.db import models
+from django.utils.translation import ugettext_lazy as _
+
+from astakos.oa2 import settings
+
+CLIENT_TYPES = (
+    ('confidential', _('Confidential')),
+    ('public', _('Public'))
+)
+
+CONFIDENTIAL_TYPES = ['confidential']
+
+
+class RedirectUrl(models.Model):
+    client = models.ForeignKey('oa2.Client')
+    default = models.BooleanField(default=True)
+    url = models.URLField(unique=True)
+
+    class Meta:
+        ordering = ('default', )