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diff --git a/fg21sim/webui/handlers/login.py b/fg21sim/webui/handlers/login.py
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+# Copyright (c) 2016 Weitian LI <liweitianux@live.com>
+# MIT license
+
+"""
+Login handler
+"""
+
+from tornado.options import options
+from tornado.escape import xhtml_escape
+
+from .base import BaseRequestHandler
+
+
+class LoginHandler(BaseRequestHandler):
+ """
+ Login page handler of the Web UI.
+
+ NOTE
+ ----
+ Only check the password to authenticate the access, therefore, the
+ default username "FG21SIM" is used.
+ """
+ def get(self):
+ if (options.password is None) or (options.password == ""):
+ # Password is not set, just allow
+ self.redirect(self.reverse_url("index"))
+ elif self.current_user:
+ # Already authenticated
+ self.redirect(self.reverse_url("index"))
+ else:
+ self.render("login.html", error="")
+
+ def post(self):
+ password = xhtml_escape(self.get_argument("password"))
+ if password == options.password:
+ self.set_secure_cookie("user", "FG21SIM")
+ self.redirect(self.reverse_url("index"))
+ else:
+ # Password incorrect
+ self.render("login.html", error="Incorrect password!")