Fixed an issue that cause user sessions to not be properly associated

Sessions could get duplicated, wrongly saved etc. The reason was not
persisting the actual user object to the internal session map (but the
LocalProxy instead). That could lead to multiple sessions being
created for one login, or the session user being set to an
anonymous user, or various other odd effects depending on timing.

src/octoprint/server/util/flask.py

@@ -227,8 +227,10 @@ def passive_login():
 		user = flask.ext.login.current_user
 
 	if user is not None and not user.is_anonymous():
-		flask.g.user = user
 		flask.ext.principal.identity_changed.send(flask.current_app._get_current_object(), identity=flask.ext.principal.Identity(user.get_id()))
+		if hasattr(user, "get_session"):
+			flask.session["usersession.id"] = user.get_session()
+		flask.g.user = user
 		return flask.jsonify(user.asDict())
 	elif settings().getBoolean(["accessControl", "autologinLocal"]) \
 			and settings().get(["accessControl", "autologinAs"]) is not None \
@@ -252,7 +254,7 @@ def passive_login():
 			logger = logging.getLogger(__name__)
 			logger.exception("Could not autologin user %s for networks %r" % (autologinAs, localNetworks))
 
-	return ("", 204)
+	return "", 204
 
 
 #~~ cache decorator for cacheable views

src/octoprint/users.py

@@ -28,13 +28,18 @@ class UserManager(object):
 	def login_user(self, user):
 		self._cleanup_sessions()
 
-		if user is None \
-		        or (isinstance(user, LocalProxy) and not isinstance(user._get_current_object(), User)) \
-		        or (not isinstance(user, LocalProxy) and not isinstance(user, User)):
+		if user is None:
+			return
+
+		if isinstance(user, LocalProxy):
+			user = user._get_current_object()
+
+		if not isinstance(user, User):
 			return None
 
 		if not isinstance(user, SessionUser):
 			user = SessionUser(user)
+
 		self._session_users_by_session[user.get_session()] = user
 
 		if not user.get_name() in self._session_users_by_username:
@@ -49,6 +54,9 @@ class UserManager(object):
 		if user is None:
 			return
 
+		if isinstance(user, LocalProxy):
+			user = user._get_current_object()
+
 		if not isinstance(user, SessionUser):
 			return
 
@@ -146,12 +154,10 @@ class UserManager(object):
 			del self._session_users_by_username[username]
 
 	def findUser(self, username=None, session=None):
-		if session is not None:
-			for session in self._session_users_by_session:
-				user = self._session_users_by_session[session]
-				if username is None or username == user.get_id():
-					return user
-				break
+		if session is not None and session in self._session_users_by_session:
+			user = self._session_users_by_session[session]
+			if username is None or username == user.get_id():
+				return user
 
 		return None