RobcOS Termlink

os.pullEvent = os.pullEventRaw
--=================================
--FalloutLock created by Savior67
--Do not Redistribute
--=================================
--CONFIG OPTIONS-------------------
local output = "bottom"   --output side
local wordFile = "codes"  --where the words are stored
local textColor = colors.green
local attempts = 4        --how many attempts to guess the word?
local permLockout = true  --lock the terminal permanently?
local script = "RobcOS"
--only way to enter if permLockout==true is with disk
--then delete lock_status, or edit and set Locked=false
----------------------------------

local usedWords = {}
local status = {}

--check for advanced monitor
if not term.isColor() then
  term.clear()
  print("ERROR CODE 0x357C5001")
  print("Bad Sectors Found In Boot Block. Terminal Error.")
  return
end
--check for wordFile
if not fs.exists(wordFile) then
  print("The word file \""..wordFile.."\" is not populated.")
  return
end
--centers the x value of a string
function center(str,y)
  local maxX,maxY = term.getSize()
  term.setCursorPos(math.floor(maxX/2)-math.floor(string.len(str)/2),y)
  term.write(str)
end
--locks the terminal
function lockout()
  term.clear()
  term.setTextColor(textColor)
  center("TERMINAL LOCKED",8)
  center("PLEASE CONTACT AN ADMINISTRATOR",10)
  local h = fs.open("lock_status","w")
  h.writeLine("Locked: true")
  h.close()
  while true do
    sleep(1000)
  end
  os.reboot()
end
--check for permLock
if not fs.exists("lock_status") then
  local h = fs.open("lock_status","w")
  h.writeLine("Locked: false")
  h.close()
else
  local h = fs.open("lock_status","r")
  local isLocked = string.sub(h.readLine(),9)
  if isLocked=="true" and permLockout then
    lockout()
  end
end

function main()
  local rows=12
  local cols=10
  term.clear()
  term.setCursorPos(1,1)
  local dict = readWords(wordFile)
  local eString1 = getEncoded(rows*cols,dict)
  local eString2 = getEncoded(rows*cols,dict)
  drawTitle()
  drawAttempts(attempts)
  drawHex(2,7)
  drawHex(20,7)
  drawEncoded(9,7,rows,cols,eString1)
  drawEncoded(27,7,rows,cols,eString2)
  local password=getPass()
  eventListener(eString1,eString2,password)
  term.setCursorPos(1,1)
end

function getStatus(choice,pass)
  local sameChars = commonLetters(choice,pass)
  table.insert(status,string.upper(choice))
  if sameChars==#pass and string.len(choice)==string.len(pass) then
     table.insert(status,"Exact match!")
     table.insert(status,"Please wait")
     table.insert(status,"while system")
     table.insert(status,"is accessed.")
  else
     table.insert(status,"Entry denied")
     table.insert(status,sameChars.."/"..string.len(pass).." correct.")
     attempts=attempts-1
  end

  if attempts==0 then
    lockout()
  end
end



function drawStatus()
  local startX=38
  local startY=16
  local currentStat=#status
  repeat
    if status[currentStat]==nil then break end
    clearFrom(startX,startY)
    term.setCursorPos(startX,startY)
    term.write(">"..status[currentStat])
    currentStat=currentStat-1
    startY=startY-1
  until startY<=6
end

--highlights part of an eString

--detects keypresses
function eventListener(leftStr,rightStr,pass)
  local side="left"     --which eString is it
  local charPos=1       --which  number character
  local cmdLineX,cmdLineY=38,18
  local selection = string.sub(leftStr,1,1)
  local onWord=false
  local cursorX,cursorY=9,7
  local upperX,upperY=36,18 --upper limits
  local lowerX,lowerY=9,7   --lower limits
  local keys = {200,208,203,205}

  highlight(cursorX,cursorY,selection)
  while true do
    local ev,p1,p2,p3 = os.pullEventRaw()
    if ev=="key" then
      if inTable(p1,keys) and not onWord then
        lowlight(cursorX,cursorY,selection)
      elseif inTable(p1,keys) and onWord then
        if side=="left" then
          lowWord(selection,leftStr,side)
        else
          lowWord(selection,rightStr,side)
        end
      end

      if p1==200 and cursorY>lowerY then  --up arrow
         cursorY=cursorY-1
      elseif p1==208 and cursorY<upperY then --down arrow
         cursorY=cursorY+1
      elseif p1==203 and cursorX>lowerX then --left arrow
         if cursorX==27 then
           side="left"
           cursorX=cursorX-9
         else
           cursorX=cursorX-1
         end
      elseif p1==205 and cursorX<upperX then --right arrow
         if cursorX==18 then
           side="right"
           cursorX=cursorX+9
         else
           cursorX=cursorX+1
         end
      elseif p1==28 then                     --enter key
        getStatus(selection,pass)
        drawStatus()
        drawAttempts(attempts)
    if selection==pass then
          os.sleep(2)
          shell.run(script)
        end
      end
    --elseif ev=="mouse_click" and p1==1 then --left mouse button
    --  if lowerX<=p2 and p2<=upperX and lowerY<=p3 and p3<=upperY then
    --    cursorX,cursorY=p2,p3
    --  end
    end

    if side=="left" then
      charPos=math.floor(((cursorY-7)*10)+(cursorX-9)+1)
      selection=string.sub(leftStr,charPos,charPos)
    else
      charPos=math.floor(((cursorY-7)*10)+(cursorX-27)+1)
      selection=string.sub(rightStr,charPos,charPos)
    end

    if isalpha(selection) and side=="left" then
      selection = findWord(cursorX,cursorY,charPos,leftStr,side)
      lightWord(selection,leftStr,side)
      onWord=true
    elseif isalpha(selection) and side=="right" then
      selection = findWord(cursorX,cursorY,charPos,rightStr,side)
      lightWord(selection,rightStr,side)
      onWord=true
    else
      onWord=false
      highlight(cursorX,cursorY,selection)
    end
    clearFrom(cmdLineX,cmdLineY)
    term.setCursorPos(cmdLineX,cmdLineY)
    term.write(">"..selection)
  end
end

function lightWord(sel,eString,side)
  local j=1
  local l,r = string.find(eString,sel)
  for i=l,r do
    local x,y=posToCoords(i,side)
    highlight(x,y,string.sub(sel,j,j))
    j=j+1
  end
end

function lowWord(sel,eString,side)
  local j=1
  local l,r = string.find(eString,sel)
  for i=l,r do
    local x,y = posToCoords(i,side)
    lowlight(x,y,string.sub(sel,j,j))
    j=j+1
  end
end

function findWord(x,y,charPos,eString,side)
  --check left and right
  local left = charPos
  local right = charPos
  while isalpha(string.sub(eString,left-1,left-1)) do
    left=left-1
  end
  while isalpha(string.sub(eString,right+1,right+1)) do
    right=right+1
  end
  --highlight the word
  for i=left,right do
    local x,y = posToCoords(i,side)
    highlight(x,y,string.sub(eString,i,i))
  end
  return(string.sub(eString,left,right))
end

function posToCoords(pos,side)
  local x,y=0,0
  if side=="left" then
    if pos%10~=0 then
      x=pos%10+8
      y=math.floor(pos/10)+7
    else
      x=10+8
      y=math.floor(pos/10)+6
    end
  else
    if pos%10~=0 then
      x=pos%10+26
      y=math.floor(pos/10)+7
    else
      x=10+26
      y=math.floor(pos/10)+6
    end
  end
  return x,y
end

function highlight(x,y,sel)
  term.setBackgroundColor(textColor)
  term.setTextColor(colors.black)
  term.setCursorPos(x,y)
  term.write(sel)
  term.setBackgroundColor(colors.black)
  term.setTextColor(textColor)
end

function lowlight(x,y,sel)
  term.setBackgroundColor(colors.black)
  term.setTextColor(textColor)
  term.setCursorPos(x,y)
  term.write(sel)
end

--returns a password from the usedWords list
function getPass()
  return(usedWords[math.random(1,#usedWords)])
end

function drawTitle()
  term.setCursorPos(2,2)
  term.setTextColor(textColor)
  term.write("ROBCO INDUSTRIES (TM) TERMLINK PROTOCOL")
  term.setCursorPos(2,3)
  term.write("ENTER PASSWORD NOW")
end

function drawAttempts(a)
  term.setCursorPos(2,5)
  term.setTextColor(textColor)
  term.clearLine()
  term.write(a.." ATTEMPT(S) LEFT: ")
  local x = 21
  for i=1,a do
    term.setBackgroundColor(textColor)
    term.setCursorPos(x,5)
    term.write(" ")
    x = x + 2
  end
  term.setBackgroundColor(colors.black)
end

function drawHex(x,y)
  local rows = 12
  term.setTextColor(textColor)
  for i=1,rows do
    term.setCursorPos(x,y)
    local hstring="0x"
    for j=1,4 do hstring=hstring..randomHex() end
    term.write(hstring)
    y = y + 1
  end
end

--returns string containing random nonletter characters
--and various words. does not have '\n' included
function getEncoded(size,words)
  local step = 1
  local totalWords=0
  local curWord = nil
  local onWord = false
  local charIter = 1 --what letter in curWord are we at?
  local chance = 0
  local encodedString=nonletter()
  local lastIsWord=false

  --fills encodedString with nonletter chars and words
  repeat
    step=step+1
    chance = math.random(1,13)
    if chance==6 and not onWord and not lastIsWord and totalWords<=8 then
      local reps=0
      repeat
        if reps>20 then break end
        curWord=words[math.random(1,#words)]
        reps=reps+1
      until not inTable(curWord,usedWords) and step+#curWord<size
      if reps<=20 then onWord=true end
    end
    --determines whether to add random nonletter or char from curWord
    if onWord then
      encodedString=encodedString..string.sub(curWord,charIter,charIter)
      charIter=charIter+1
      if charIter>#curWord then
         table.insert(usedWords,curWord)
         onWord=false
         totalWords=totalWords+1
         lastIsWord=true
         charIter=1
       end
    else
      encodedString=encodedString..nonletter()
      lastIsWord=false
    end
  until string.len(encodedString)==size
  return encodedString
end

function isalpha(char)
  local alpha="abcdefghijklmnopqrstuvwxyz"
  for i=1,string.len(alpha) do
    if string.sub(alpha,i,i)==char then return true end
  end
  return false
end
--lightS is a table {x1,y1} and lightE is table {x2,y2}
function drawEncoded(x,y,rows,cols,eString,lightS,lightE)
  term.setTextColor(textColor)
  local curX=x
  local curY=y
  for i=1,rows*cols do
    term.setCursorPos(curX,curY)
    term.write(string.sub(eString,i,i))
    if i%cols==0 then
       curY=curY+1
       curX=x
    else
       curX=curX+1
    end
  end
end

--read the codewords from the file
--returns list
function readWords(fileName)
  local dict = {}
  local h = fs.open(fileName,"r")
  for word in string.gmatch(h.readAll(), "%a+") do table.insert(dict,word) end
  return dict
end


function findPattern(text,pattern,start)
  return string.sub(text,string.find(text,pattern,start))
end

--returns one nonletter char (random)
function nonletter()
  local possible = {'!','@','#','$','%','^','&','*',
                   '(',')','_','-','+','=','[','{',
                   ']','|',',','\'','\"','}',
                   ';',':','.','>','<','?'}
  return(possible[math.random(1,#possible)])
end

--returns one valid hex num (random)
function randomHex()
  local possible = {'A','B','C','D','E','F'}
  for i=0,9 do
    table.insert(possible,i)
  end
  return(possible[math.random(1,#possible)])
end

--returns int of same letters in same positions in two strings.
function commonLetters(s1,s2)
  charsInCommon=0
  local long,short=nil,nil
  if string.len(s1)>=string.len(s2) then long,short=s1,s2
  else long,short=s2,s1 end
  for i=1,#long do
    if string.sub(long,i,i)==string.sub(short,i,i) then
      charsInCommon=charsInCommon+1
    elseif string.sub(short,i,i)==nil then
      break
    end
  end
  return charsInCommon
end

--clears a line from x,y till the end of the screen
function clearFrom(x,y)
  term.setCursorPos(x,y)
  for i=0,51-x do
    term.setCursorPos(x+i,y)
    term.write(" ")
  end
end

--checks if a value is in a given table
function inTable(val,t)
  for k,v in ipairs(t) do
    if v==val then
      return true
    end
  end
  return false
end

main()