Login client support multi-server

--changelog
--CURRENT: -  v0.3.4 - Security question!
--v0.3.3   -  updated something
--v0.3.2   -  Added line 18 - 24, Fixed error of nil, Fixed Lot of thing
--v0.3.1   -  Fixed serverID
--v0.3     -  NICKNAME!
--v0.2.1   -  Fixed serverID
--v0.2     -  allow to change username & password
--v0.1     -  Published

--Pre-Pre-Alpla version
--v0.05    -  Fixed some bug
--v0.01    -  Born

local serverID

print("serverID is?")
term.setCursorPos(1, 2)
serverID = read()
sleep(1)
term.clear()

local function enter(username)
local nick
repeat
rednet.send(serverID, "user")
sleep(0.5)
rednet.send(serverID, username)
sleep(0.5)
rednet.send(serverID, "check")
sleep(0.5)
rednet.send(serverID, "could")
local ID, MSG, DISTANCE = rednet.receive(10)
if MSG == "nope" or MSG == nil or MSG == "" then
print("Hello, "..username)
elseif MSG == "yes" then
local ID, MSG, DISTANCE = rednet.receive(10)
nick = MSG
print("Hello, "..nick)
end
print("(1)Edit username")
print("(2)Edit password")
print("(3)Edit nick")
print("(4)Edit Security question")
print("(5)Logout")
print("1, 2, 3 ,4 or 5?")
print(">")
term.setCursorPos(2, 8)
local num = read()

if num == "1" then
local nameuser
repeat
term.setCursorPos(1, 5)
print("                                                  ")
print("                                                  ")
term.setCursorPos(1, 3)
print("New username:")
print(">                                                 ")
term.setCursorPos(2, 4)
nameuser = read()
term.setCursorPos(1, 5)
print("Need to change? n for no, y for yes")
change = read()
until change == "n"
term.setCursorPos(1, 5)
print("                                                  ")
print("                                                  ")
term.setCursorPos(1, 5)
print("Please wait...")
rednet.send(serverID, "user")
sleep(0.5)
rednet.send(serverID, username)
sleep(0.5)
rednet.send(serverID, "user2")
sleep(0.5)
rednet.send(serverID, nameuser)
sleep(0.5)
rednet.send(serverID, "cn")
term.setCursorPos(3, 6)
print("Comfirming...")
sleep(0.5)
rednet.send(serverID, "could")
local ID, MSG, DISTANCE = rednet.receive(10)
if MSG == "finish" then
does = "no"
term.setCursorPos(1, 8)
print("Please login with your new username.")
sleep(3)
dooo = "yes"
elseif MSG == "nou" then
term.setCursorPos(1, 8)
print("New username exist.")
sleep(2)
else
term.setCursorPos(1, 8)
print("Server closed.")
sleep(2)
end

elseif num == "2" then
local password,wordpass
repeat
term.setCursorPos(1, 7)
print("                                                  ")
print("                                                  ")
term.setCursorPos(1, 3)
print("Old password:")
print(">                                              ")
print("New password:")
print(">                                              ")
term.setCursorPos(2, 4)
password = read("x")
term.setCursorPos(2, 6)
wordpass = read("x")
term.setCursorPos(1, 7)
print("Need to change? n for no, y for yes")
term.setCursorPos(1, 8)
change = read()
until change == "n"
term.setCursorPos(1, 7)
print("                                                  ")
print("                                                  ")
term.setCursorPos(1, 7)
print("Please wait...")
rednet.send(serverID, "user")
sleep(0.5)
rednet.send(serverID, username)
sleep(0.5)
rednet.send(serverID, "pass")
sleep(0.5)
rednet.send(serverID, password)
sleep(0.5)
rednet.send(serverID, "pass2")
sleep(0.5)
rednet.send(serverID, wordpass)
sleep(0.5)
rednet.send(serverID, "cp")
term.setCursorPos(1, 8)
print("Comfirming...")
sleep(0.5)
rednet.send(serverID, "could")
local ID, MSG, DISTANCE = rednet.receive(10)
if MSG == "finish" then
term.setCursorPos(1, 7)
print("Changed password.")
print("Please login with your new password.")
sleep(3)
dooo = "yes"
elseif MSG == "wrongp" then
term.setCursorPos(1, 7)
print("Wrong Old password.")
sleep(2)
else
term.setCursorPos(1, 7)
print("Server closed.")
sleep(2)
end

elseif num == "3" then
local nick2
repeat
term.setCursorPos(1, 5)
print("                                                  ")
print("                                                  ")
term.setCursorPos(1, 3)
print("Nickname:")
print(">                                               ")
term.setCursorPos(2, 4)
nick2 = read()
term.setCursorPos(1, 5)
print("Need to change? n for no, y for yes")
term.setCursorPos(1, 6)
change = read()
until change == "n"
term.setCursorPos(1, 5)
print("                                                  ")
print("                                                  ")
term.setCursorPos(1, 5)
print("Please wait...")
rednet.send(serverID, "user")
sleep(0.5)
rednet.send(serverID, username)
sleep(0.5)
rednet.send(serverID, "nick")
sleep(0.5)
rednet.send(serverID, nick2)
sleep(0.5)
rednet.send(serverID, "nc")
term.setCursorPos(1, 6)
print("Comfirming...")
sleep(0.5)
rednet.send(serverID, "could")
local ID, MSG, DISTANCE = rednet.receive(10)
if MSG == "finishn" then
does = "no"
term.setCursorPos(1, 8)
print("You have changed your nickname.")
sleep(3)
elseif MSG == "non" then
term.setCursorPos(1, 8)
print("New nickname exist.")
sleep(2)
else
term.setCursorPos(1, 7)
print("Server closed.")
sleep(2)
end


elseif num == "4" then
drawmenu()
local question,answer
repeat
term.setCursorPos(1, 7)
print("|                                                |")
print("|                                                |")
term.setCursorPos(1, 3)
print("Security Question:")
print(">                                              |")
print("Answer:")
print(">                                              |")
term.setCursorPos(2, 4)
question = read()
term.setCursorPos(2, 6)
answer = read()
term.setCursorPos(1, 7)
print("Need to change? n for no, y for yes")
term.setCursorPos(1, 8)
change = read()
until change == "n"
term.setCursorPos(1, 7)
print("|                                                |")
print("|                                                |")
term.setCursorPos(1, 7)
print("Please wait...")
rednet.send(serverID, "user")
sleep(0.5)
rednet.send(serverID, username)
sleep(0.5)
rednet.send(serverID, "ques")
sleep(0.5)
rednet.send(serverID, question)
sleep(0.5)
rednet.send(serverID, "ans")
sleep(0.5)
rednet.send(serverID, answer)
sleep(0.5)
rednet.send(serverID, "secur")
print("Comfirming...")
sleep(0.5)
rednet.send(serverID, "could")
local ID, MSG, DISTANCE = rednet.receive(10)
if MSG == "qdone" then
print("Updated Security Question")
sleep(3)
else
print("Server Closed")
sleep(2)
end


elseif num == "5" then
drawmenu()
term.setCursorPos(3, 3)
if nick == nil or nick == "" then
print("Bye, "..username)
else
print("Bye, "..nick)
end
sleep(2)
dooo = "yes"
end

local function login(rl)
local username,password
repeat
term.setCursorPos(1, 9)
print("                                                  ")
print("                                                  ")
term.setCursorPos(1, 7)
print("Username:                                       ")
print("Password:                                       ")

term.setCursorPos(10, 7)
username = read()
term.setCursorPos(10, 8)
password = read("x")
term.setCursorPos(1, 9)
print("need to change? y for yes, n for no")
term.setCursorPos(1, 10)
local change = read()

until change == "n"
term.setCursorPos(1, 9)
print("                                                  ")
print("                                                  ")
term.setCursorPos(1, 10)
print("Please wait while we sending your username..")
rednet.send(serverID, "user")
sleep(1)
print("Done.")
rednet.send(serverID, username)
sleep(0.5)
print("Please wait while we sending your password..")
rednet.send(serverID, "pass")
sleep(1)
print("Done.")
rednet.send(serverID, password)
sleep(0.5)
rednet.send(serverID, rl)
sleep(0.5)
rednet.send(serverID, "could")
term.setCursorPos(3, 14)
print("Completed.")

local ID, MSG, DISTANCE = rednet.receive(10)
if MSG == "complete" then
term.setCursorPos(1, 15)
print("You have registered.")
sleep(3)

elseif MSG == "correct" then
term.setCursorPos(1, 15)
print("You have logged in.")
sleep(3)
enter(username)

elseif MSG == "pass" then
term.setCursorPos(1, 15)
print("Invalid password.")
sleep(3)

elseif MSG == "wrong" then
term.setCursorPos(1, 15)
print("Invalid username.")
sleep(3)

elseif MSG == "no" then
term.setCursorPos(1, 15)
print("Username exist.")
sleep(3)

else
term.setCursorPos(1, 15)
print("Server closed.")
sleep(3)

end
end

term.setCursorPos(1, 1)
print("Register or login?(type r/l)")
term.setCursorPos(1, 2)
rl = read()
term.setCursorPos(1, 4)
if rl == "r" then
print("register:")
login(rl)

elseif rl == "l" then
print("login:")
login(rl)

else
print("what is "..rl.."?")
term.setCursorPos(3, 7)
print("r for register, l for login")
term.setCursorPos(3, 8)
print("back to menu")
sleep(1)
end