[xOS] Add Accounts

--[[
Add Accounts File
Written by TheShadow989
]]--

os.pullEvent = os.pullEventRaw
os.loadAPI("xos/api/sha256")

local verNumber = "Alpha 1.24"
local x = term.getSize()

rRead = fs.open("xos/.usertable", "r")
users = textutils.unserialize(rRead.readAll())
rRead.close()
cu = tonumber(users[1])
cs = tonumber(users[cu+1])
cp = tonumber(users[cu+2])

local function cPrint(string)
    x, _ = term.getSize()
    _, y = term.getCursorPos()
    term.setCursorPos((x-#string)/2,y)
    textutils.slowPrint(string)

end

local function kPrint(string)
    x, _ = term.getSize()
    _, y = term.getCursorPos()
    term.setCursorPos((x-#string)/2,y)
    print(string)
end

local function errormsg()
    term.clear()
    term.setCursorPos(1,19)
    term.write("xOS "..verNumber.." by TheShadow989")
    term.setCursorPos(1,3)
    kPrint("Create Account")
    term.setCursorPos(11,8)
end

term.clear()
term.setCursorPos(1,19)

term.write("xOS "..verNumber.." by TheShadow989")

term.setCursorPos(1,3)
cPrint("Create Account")
sleep(2)

while true do
    term.setCursorPos(17,8)
    write("Username: ")
    newuser = read()
    userlenght = string.len(newuser)

    if userlenght >= 10 then
        errormsg()
        term.setTextColor( colors.red )
        kPrint("Username must be between 1-9 characters!")
        term.setTextColor( colors.white )
        sleep(3)
        errormsg()
    else
        break
    end
end


while true do
    term.setCursorPos(17,8)
    write("Username: "..newuser)

    term.setCursorPos(17,10)
    write("Password: ")
    newpass = read('*')

    term.setCursorPos(17,12)
    write("Re-enter Password: ")
    newpass2 = read('*')

    if newpass ~= newpass2 then
        errormsg()
        term.setTextColor( colors.red )
        kPrint("Passwords entered do not match!")
        term.setTextColor( colors.white )
        sleep(3)
        errormsg()
    else
        break
    end
end

newseclvl = "1"

if users[5] == nil then
    users[5] = newuser
    users[6] = newseclvl
    users[7] = sha256.sha256(newpass)
elseif users[8] == nil then
    users[8] = newuser
    users[9] = newseclvl
    users[10] = sha256.sha256(newpass)
elseif users[11] == nil then
    users[11] = newuser
    users[12] = newseclvl
    users[13] = sha256.sha256(newpass)
end

rWrite = fs.open("xos/.usertable", "w")
rWrite.write(textutils.serialize(users))
rWrite.close()

term.clear()
term.setTextColor(colors.green)
term.setCursorPos(11,8)
kPrint("Account Created, Rebooting!")
sleep(3)
os.reboot()