1 files changed, 117 insertions, 0 deletions
diff --git a/service/src/pixelated/resources/auth.py b/service/src/pixelated/resources/auth.py
new file mode 100644
index 00000000..adac985f
--- /dev/null
+++ b/service/src/pixelated/resources/auth.py
@@ -0,0 +1,117 @@
+#
+# Copyright (c) 2016 ThoughtWorks, Inc.
+#
+# Pixelated is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Pixelated is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with Pixelated. If not, see <http://www.gnu.org/licenses/>.
+
+import re
+
+from pixelated.resources import IPixelatedSession
+from twisted.cred import error
+from twisted.cred import portal, checkers
+from twisted.cred.checkers import ANONYMOUS
+from twisted.cred.credentials import ICredentials
+from twisted.internet import defer
+from twisted.logger import Logger
+from twisted.web import util
+from twisted.web._auth.wrapper import UnauthorizedResource
+from twisted.web.error import UnsupportedMethod
+from twisted.web.resource import IResource, ErrorPage
+from zope.interface import implements, implementer, Attribute
+
+
+log = Logger()
+
+
+class ISessionCredential(ICredentials):
+
+    request = Attribute('the current request')
+
+
+@implementer(ISessionCredential)
+class SessionCredential(object):
+    def __init__(self, request):
+        self.request = request
+
+
+@implementer(checkers.ICredentialsChecker)
+class SessionChecker(object):
+    credentialInterfaces = (ISessionCredential,)
+
+    def __init__(self, services_factory):
+        self._services_factory = services_factory
+
+    def requestAvatarId(self, credentials):
+        session = self.get_session(credentials.request)
+        if session.is_logged_in() and self._services_factory.has_session(session.user_uuid):
+            return defer.succeed(session.user_uuid)
+        return defer.succeed(ANONYMOUS)
+
+    def get_session(self, request):
+        return IPixelatedSession(request.getSession())
+
+
+class PixelatedRealm(object):
+    implements(portal.IRealm)
+
+    def requestAvatar(self, avatarId, mind, *interfaces):
+        if IResource in interfaces:
+            return IResource, avatarId, lambda: None
+        raise NotImplementedError()
+
+
+@implementer(IResource)
+class PixelatedAuthSessionWrapper(object):
+
+    isLeaf = False
+
+    def __init__(self, portal, root_resource, anonymous_resource, credentialFactories):
+        self._portal = portal
+        self._credentialFactories = credentialFactories
+        self._root_resource = root_resource
+        self._anonymous_resource = anonymous_resource
+
+    def render(self, request):
+        raise UnsupportedMethod(())
+
+    def getChildWithDefault(self, path, request):
+        request.postpath.insert(0, request.prepath.pop())
+        return self._authorizedResource(request)
+
+    def _authorizedResource(self, request):
+        creds = SessionCredential(request)
+        return util.DeferredResource(self._login(creds, request))
+
+    def _login(self, credentials, request):
+        pattern = re.compile("^/sandbox/")
+
+        def loginSucceeded(args):
+            interface, avatar, logout = args
+            if avatar == checkers.ANONYMOUS and not pattern.match(request.path):
+                return self._anonymous_resource
+            else:
+                return self._root_resource
+
+        def loginFailed(result):
+            if result.check(error.Unauthorized, error.LoginFailed):
+                return UnauthorizedResource(self._credentialFactories)
+            else:
+                log.err(
+                    result,
+                    "HTTPAuthSessionWrapper.getChildWithDefault encountered "
+                    "unexpected error")
+                return ErrorPage(500, None, None)
+
+        d = self._portal.login(credentials, None, IResource)
+        d.addCallbacks(loginSucceeded, loginFailed)
+        return d