Added loginsecurity module

Added to make an easily adjustible version of LoginSecurity.
LoginSecurity does not (seem to) support name changes since it retrieves
the UUID used from a byte[] of "OfflinePlayer:<username>" which means
the UUID changes when a player changes their name. This should fix
/rmpass. It uses BCrypt. I'll test this on the dev server (hoping bcrypt
is installed)

loginsecurity.py

@@ -0,0 +1,121 @@
+from helpers import *
+from basecommands import simplecommand
+import bcrypt
+from time import time as now
+import thread
+
+
+wait_time       = 60 #seconds
+admin_perm      = "utils.loginsecurity.admin"
+min_pass_length = 6
+
+run_kick_thread = True
+blocked_events  = ["block.BlockBreakEvent", "block.BlockPlaceEvent", "player.PlayerMoveEvent"]
+passwords       = open_json_file("loginpasswords", {})
+
+#if passwords == None: (set default value to None  ^^)
+#    Keep everyone from playing? (Insecure)
+
+withholdings    = {} #pname : jointime
+
+
+def save_passwords():
+    save_json_file("loginpasswords", passwords)
+
+
+def matches(password, user):
+    hashed = passwords.get(uid(user))
+    return bcrypt.hashpw(password, hashed) == hashed
+
+
+@simplecommand("login",
+        usage       = "<password>", 
+        description = "Logs you in if <password> matches your password.",
+        senderLimit = 0, 
+        helpNoargs  = True)
+def login_command(sender, command, label, args):
+    password = " ".join(args)
+    if matches(password, sender):
+        del withholdings[sender.getName()]
+        return "&aLogged in successfully!"
+    return "&cInvalid password"
+
+
+@simplecommand("register",
+        usage       = "<password>",
+        description = "Registers you with <password>. Next time you join, log in with /login",
+        senderLimit = 0,
+        helpNoArgs  = True)
+def register_command(sender, command, label, args):
+    uuid = uid(sender)
+    if uuid in passwords:
+        return "&cYou are already registered!"
+    password = " ".join(args)
+    if len(password) < min_pass_length:
+        return "&cThe password has to be made up of at least 8 characters!"
+    hashed = bcrypt.hashpw(password, bcrypt.gensalt(16))
+    passwords[uuid] = hashed
+    return "&cPassword set. Use /login <password> upon join."
+
+
+@simplecommand("rmpass",
+        usage       = "<password>",
+        description = "Removes your password if the password matches",
+        senderLimit = 0,
+        helpNoArgs  = True)
+def rmpass_command(sender, command, label, args):
+    password = " ".join(args)
+    if matches(password, sender):
+        del passwords[uuid(sender)]
+        return "&aPassword removed successfully. You will not be prompted anymore."
+    return "&cInvalid password"
+
+
+@simplecommand("rmotherpass",
+        aliases     = ["lacrmpass"],
+        usage       = "<user>",
+        description = "Removes password of <user> and sends them a notification",
+        helpNoArgs  = True)
+def rmotherpass_command(sender, command, label, args):
+    user = server.getOfflinePlayer(args[0])
+    if user:
+        del passwords[uid(user)]
+        runas(server.getConsoleSender(), colorify("mail send %s &cYour password was reset by a staff member. Use &o/register&c to set a new one."))
+        return "&sPassword of %s reset successfully" % user.getName()
+    return "&cThat player could not be found"
+
+
+@hook.event("player.PlayerJoinEvent", "highest")
+def on_join(event):
+    user = event.getPlayer()
+    if get_id(user) in passwords:
+        withholdings[user.getName()] = now()
+
+
+@hook.event("player.PlayerQuitEvent", "normal")
+def on_quit(event):
+    del withholdings[event.getPlayer().getName()]
+
+
+def kick_thread():
+    wait_time_millis = wait_time * 1000
+    while True:
+        if not run_kick_thread:
+            info("Exiting LoginSecurity kicking thread!")
+            thread.exit()
+        time.sleep(1)
+        moment = now()
+        for name, jointime in withholdings.iteritems():
+            if moment - jointime > wait_time_millis:
+                server.getPlayer(name).kickPlayer(colorify("&cLogin timed out"))
+
+
+thread.start_new_thread(kick_thread, ())
+
+for blocked_event in blocked_events:
+    @hook.event(blocked_event, "low")
+    def on_blocked_event(event):
+        user = event.getPlayer()
+        if user.getName() in withholdings:
+            event.setCancelled(True)
+            msg(user, "&cYou have to log in first! Use /login <password>")