diff --git a/api/__init__.py b/api/__init__.py
index 433d2ac..fd8a89e 100755
--- a/api/__init__.py
+++ b/api/__init__.py
@@ -45,7 +45,7 @@ def authorize():
 	if decoded_pass.startswith('enc:'):
 		decoded_pass = hexdecode(decoded_pass[4:])
 	
-	if UserManager.try_auth(username, decoded_pass)[0] != UserManager.LOGIN_SUCCESS:
+	if UserManager.try_auth(username, decoded_pass)[0] != UserManager.SUCCESS:
 		return error
 
 @app.after_request
diff --git a/user.py b/user.py
index 2248660..c37ba98 100755
--- a/user.py
+++ b/user.py
@@ -34,11 +34,11 @@ def add_user():
 
 	if not error:
 		status = UserManager.add(name, passwd, mail, admin)
-		if status == UserManager.ADD_SUCCESS:
+		if status == UserManager.SUCCESS:
 			flash("User '%s' successfully added" % name)
 			return redirect(url_for('user_index'))
-		elif status == UserManager.ADD_NAME_EXISTS:
-			flash('There is already a user with that name. Please pick another one.')
+		else:
+			flash(UserManager.error_str(status))
 
 	return render_template('adduser.html')
 
@@ -46,14 +46,10 @@ def add_user():
 @app.route('/user/del/<uid>')
 def del_user(uid):
 	status = UserManager.delete(uid)
-	if status == UserManager.DEL_SUCCESS:
+	if status == UserManager.SUCCESS:
 		flash('Deleted user')
-	elif status == UserManager.DEL_INVALID_ID:
-		flash('Invalid user id')
-	elif status == UserManager.DEL_NO_SUCH_USER:
-		flash('No such user')
 	else:
-		flash('Unknown error')
+		flash(UserManager.error_str(status))
 
 	return redirect(url_for('user_index'))
 
@@ -78,16 +74,12 @@ def login():
 
 	if not error:
 		status, user = UserManager.try_auth(name, password)
-		if status == UserManager.LOGIN_SUCCESS:
+		if status == UserManager.SUCCESS:
 			session['userid'] = str(user.id)
 			flash('Logged in!')
 			return redirect(return_url)
-		elif status == UserManager.LOGIN_NO_SUCH_USER:
-			flash('Unknown user')
-		elif status == UserManager.LOGIN_WRONG_PASS:
-			flash('Wrong password')
 		else:
-			flash('Unknown error')
+			flash(UserManager.error_str(status))
 
 	return render_template('login.html')
 
diff --git a/user_manager.py b/user_manager.py
index ccb931f..637d875 100755
--- a/user_manager.py
+++ b/user_manager.py
@@ -6,59 +6,77 @@ import uuid
 from db import User, session
 
 class UserManager:
-	ADD_SUCCESS = 0
-	ADD_NAME_EXISTS = 1
+	SUCCESS = 0
+	INVALID_ID = 1
+	NO_SUCH_USER = 2
+	NAME_EXISTS = 3
+	WRONG_PASS = 4
 
-	DEL_SUCCESS = 0
-	DEL_INVALID_ID = 1
-	DEL_NO_SUCH_USER = 2
+	@staticmethod
+	def get(uid):
+		if type(uid) in (str, unicode):
+			try:
+				uid = uuid.UUID(uid)
+			except:
+				return UserManager.INVALID_ID, None
+		elif type(uid) is uuid.UUID:
+			pass
+		else:
+			return UserManager.INVALID_ID, None
 
-	LOGIN_SUCCESS = 0
-	LOGIN_NO_SUCH_USER = 1
-	LOGIN_WRONG_PASS = 2
+		user = User.query.get(uid)
+		if user is None:
+			return UserManager.NO_SUCH_USER, None
+
+		return UserManager.SUCCESS, user
 
 	@staticmethod
 	def add(name, password, mail, admin):
 		if User.query.filter(User.name == name).first():
-			return UserManager.ADD_NAME_EXISTS
+			return UserManager.NAME_EXISTS
 
 		crypt, salt = UserManager.__encrypt_password(password)
 		user = User(name = name, mail = mail, password = crypt, salt = salt, admin = admin)
 		session.add(user)
 		session.commit()
 
-		return UserManager.ADD_SUCCESS
+		return UserManager.SUCCESS
 
 	@staticmethod
 	def delete(uid):
-		if type(uid) in (str, unicode):
-			try:
-				uid = uuid.UUID(uid)
-			except:
-				return UserManager.DEL_INVALID_ID
-		elif type(uid) is uuid.UUID:
-			pass
-		else:
-			return UserManager.DEL_INVALID_ID
-
-		user = User.query.get(uid)
-		if user is None:
-			return UserManager.DEL_NO_SUCH_USER
+		status, user = UserManager.get(uid)
+		if status != UserManager.SUCCESS:
+			return status
 
 		session.delete(user)
 		session.commit()
 
-		return UserManager.DEL_SUCCESS
+		return UserManager.SUCCESS
 
 	@staticmethod
 	def try_auth(name, password):
 		user = User.query.filter(User.name == name).first()
 		if not user:
-			return UserManager.LOGIN_NO_SUCH_USER, None
+			return UserManager.NO_SUCH_USER, None
 		elif UserManager.__encrypt_password(password, user.salt)[0] != user.password:
-			return UserManager.LOGIN_WRONG_PASS, None
+			return UserManager.WRONG_PASS, None
 		else:
-			return UserManager.LOGIN_SUCCESS, user
+			return UserManager.SUCCESS, user
+
+	@staticmethod
+	def error_str(err):
+		if err == UserManager.SUCCESS:
+			return 'No error'
+		elif err == UserManager.INVALID_ID:
+			return 'Invalid user id'
+		elif err == UserManager.NO_SUCH_USER:
+			return 'No such user'
+		elif err == UserManager.NAME_EXISTS:
+			return 'There is already a user with that name'
+		elif err == UserManager.WRONG_PASS:
+			return 'Wrong password'
+		else:
+			return 'Unkown error'
 
 	@staticmethod
 	def __encrypt_password(password, salt = None):