IRC Turtle Bot Loadstring

--[[
IRC Controlled Turtle Scipt
Lion4ever, 2014
http://pastebin.com/sPpkBP9v


Heavyly base on the CC IRC Client from:
Matti Vapa, 2014
https://github.com/mattijv/IRCCC/
http://pastebin.com/gaSL8HZC

This program is released under the MIT license.

]]--

--Preventing second instance (but not third):
if isRunning then
    isRunning = false --leaving no traces
    return false
end
isRunning = true

-- look at the source of the qwebirc webchat login page and take the values
-- for baseUrl and dynamicBaseUrl for use here
-- examples for espernet and quakenet

local baseUrl = "http://webchat.esper.net/"
local dynamicUrl = ""
--local baseUrl = "http://webchat.quakenet.org/"
--local dynamicUrl = "dynamic/leibniz/"


--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
-- JSON4Lua: JSON encoding / decoding support for the Lua language.
-- json Module.
-- Author: Craig Mason-Jones
-- Homepage: http://json.luaforge.net/
-- Version: 0.9.40
-- This module is released under the MIT License (MIT).

-- edited for brevity

local base = _G
local decode_scanArray
local decode_scanComment
local decode_scanConstant
local decode_scanNumber
local decode_scanObject
local decode_scanString
local decode_scanWhitespace
local encodeString
local isArray
local isEncodable
local function encode (v)
  -- Handle nil values
  if v==nil then
    return "null"
  end

  local vtype = base.type(v)

  -- Handle strings
  if vtype=='string' then
    return '"' .. encodeString(v) .. '"'            -- Need to handle encoding in string
  end

  -- Handle booleans
  if vtype=='number' or vtype=='boolean' then
    return base.tostring(v)
  end

  -- Handle tables
  if vtype=='table' then
    local rval = {}
    -- Consider arrays separately
    local bArray, maxCount = isArray(v)
    if bArray then
      for i = 1,maxCount do
        table.insert(rval, encode(v[i]))
      end
    else        -- An object, not an array
      for i,j in base.pairs(v) do
        if isEncodable(i) and isEncodable(j) then
          table.insert(rval, '"' .. encodeString(i) .. '":' .. encode(j))
        end
      end
    end
    if bArray then
      return '[' .. table.concat(rval,',') ..']'
    else
      return '{' .. table.concat(rval,',') .. '}'
    end
  end

  -- Handle null values
  if vtype=='function' and v==null then
    return 'null'
  end

  base.assert(false,'encode attempt to encode unsupported type ' .. vtype .. ':' .. base.tostring(v))
end

local function decode(s, startPos)
  startPos = startPos and startPos or 1
  startPos = decode_scanWhitespace(s,startPos)
  base.assert(startPos<=string.len(s), 'Unterminated JSON encoded object found at position in [' .. s .. ']')
  local curChar = string.sub(s,startPos,startPos)
  -- Object
  if curChar=='{' then
    return decode_scanObject(s,startPos)
  end
  -- Array
  if curChar=='[' then
    return decode_scanArray(s,startPos)
  end
  -- Number
  if string.find("+-0123456789.e", curChar, 1, true) then
    return decode_scanNumber(s,startPos)
  end
  -- String
  if curChar==[["]] or curChar==[[']] then
    return decode_scanString(s,startPos)
  end
  if string.sub(s,startPos,startPos+1)=='/*' then
    return decode(s, decode_scanComment(s,startPos))
  end
  -- Otherwise, it must be a constant
  return decode_scanConstant(s,startPos)
end

local function null()
  return null -- so json.null() will also return null ;-)
end


function decode_scanArray(s,startPos)
  local array = {}      -- The return value
  local stringLen = string.len(s)
  base.assert(string.sub(s,startPos,startPos)=='[','decode_scanArray called but array does not start at position ' .. startPos .. ' in string:\n'..s )
  startPos = startPos + 1
  -- Infinite loop for array elements
  repeat
    startPos = decode_scanWhitespace(s,startPos)
    base.assert(startPos<=stringLen,'JSON String ended unexpectedly scanning array.')
    local curChar = string.sub(s,startPos,startPos)
    if (curChar==']') then
      return array, startPos+1
    end
    if (curChar==',') then
      startPos = decode_scanWhitespace(s,startPos+1)
    end
    base.assert(startPos<=stringLen, 'JSON String ended unexpectedly scanning array.')
    object, startPos = decode(s,startPos)
    table.insert(array,object)
  until false
end

function decode_scanComment(s, startPos)
  base.assert( string.sub(s,startPos,startPos+1)=='/*', "decode_scanComment called but comment does not start at position " .. startPos)
  local endPos = string.find(s,'*/',startPos+2)
  base.assert(endPos~=nil, "Unterminated comment in string at " .. startPos)
  return endPos+2
end

function decode_scanConstant(s, startPos)
  local consts = { ["true"] = true, ["false"] = false, ["null"] = nil }
  local constNames = {"true","false","null"}

  for i,k in base.pairs(constNames) do
    --print ("[" .. string.sub(s,startPos, startPos + string.len(k) -1) .."]", k)
    if string.sub(s,startPos, startPos + string.len(k) -1 )==k then
      return consts[k], startPos + string.len(k)
    end
  end
  base.assert(nil, 'Failed to scan constant from string ' .. s .. ' at starting position ' .. startPos)
end

function decode_scanNumber(s,startPos)
  local endPos = startPos+1
  local stringLen = string.len(s)
  local acceptableChars = "+-0123456789.e"
  while (string.find(acceptableChars, string.sub(s,endPos,endPos), 1, true)
        and endPos<=stringLen
        ) do
    endPos = endPos + 1
  end
  local stringValue = 'return ' .. string.sub(s,startPos, endPos-1)
  local stringEval = base.loadstring(stringValue)
  base.assert(stringEval, 'Failed to scan number [ ' .. stringValue .. '] in JSON string at position ' .. startPos .. ' : ' .. endPos)
  return stringEval(), endPos
end

function decode_scanObject(s,startPos)
  local object = {}
  local stringLen = string.len(s)
  local key, value
  base.assert(string.sub(s,startPos,startPos)=='{','decode_scanObject called but object does not start at position ' .. startPos .. ' in string:\n' .. s)
  startPos = startPos + 1
  repeat
    startPos = decode_scanWhitespace(s,startPos)
    base.assert(startPos<=stringLen, 'JSON string ended unexpectedly while scanning object.')
    local curChar = string.sub(s,startPos,startPos)
    if (curChar=='}') then
      return object,startPos+1
    end
    if (curChar==',') then
      startPos = decode_scanWhitespace(s,startPos+1)
    end
    base.assert(startPos<=stringLen, 'JSON string ended unexpectedly scanning object.')
    -- Scan the key
    key, startPos = decode(s,startPos)
    base.assert(startPos<=stringLen, 'JSON string ended unexpectedly searching for value of key ' .. key)
    startPos = decode_scanWhitespace(s,startPos)
    base.assert(startPos<=stringLen, 'JSON string ended unexpectedly searching for value of key ' .. key)
    base.assert(string.sub(s,startPos,startPos)==':','JSON object key-value assignment mal-formed at ' .. startPos)
    startPos = decode_scanWhitespace(s,startPos+1)
    base.assert(startPos<=stringLen, 'JSON string ended unexpectedly searching for value of key ' .. key)
    value, startPos = decode(s,startPos)
    object[key]=value
  until false   -- infinite loop while key-value pairs are found
end

function decode_scanString(s,startPos)
  base.assert(startPos, 'decode_scanString(..) called without start position')
  local startChar = string.sub(s,startPos,startPos)
  base.assert(startChar==[[']] or startChar==[["]],'decode_scanString called for a non-string')
  local escaped = false
  local endPos = startPos + 1
  local bEnded = false
  local stringLen = string.len(s)
  repeat
    local curChar = string.sub(s,endPos,endPos)
    -- Character escaping is only used to escape the string delimiters
    if not escaped then
      if curChar==[[\]] then
        escaped = true
      else
        bEnded = curChar==startChar
      end
    else
      -- If we're escaped, we accept the current character come what may
      escaped = false
    end
    endPos = endPos + 1
    base.assert(endPos <= stringLen+1, "String decoding failed: unterminated string at position " .. endPos)
  until bEnded
  local stringValue = 'return ' .. string.sub(s, startPos, endPos-1)
  local stringEval = base.loadstring(stringValue)
  base.assert(stringEval, 'Failed to load string [ ' .. stringValue .. '] in JSON4Lua.decode_scanString at position ' .. startPos .. ' : ' .. endPos)
  return stringEval(), endPos
end

function decode_scanWhitespace(s,startPos)
  local whitespace=" \n\r\t"
  local stringLen = string.len(s)
  while ( string.find(whitespace, string.sub(s,startPos,startPos), 1, true)  and startPos <= stringLen) do
    startPos = startPos + 1
  end
  return startPos
end

function encodeString(s)
  s = string.gsub(s,'\\','\\\\')
  s = string.gsub(s,'"','\\"')
  s = string.gsub(s,'\n','\\n')
  s = string.gsub(s,'\t','\\t')
  return s
end

function isArray(t)
  -- Next we count all the elements, ensuring that any non-indexed elements are not-encodable
  -- (with the possible exception of 'n')
  local maxIndex = 0
  for k,v in base.pairs(t) do
    if (base.type(k)=='number' and math.floor(k)==k and 1<=k) then      -- k,v is an indexed pair
      if (not isEncodable(v)) then return false end     -- All array elements must be encodable
      maxIndex = math.max(maxIndex,k)
    else
      if (k=='n') then
        if v ~= table.getn(t) then return false end  -- False if n does not hold the number of elements
      else -- Else of (k=='n')
        if isEncodable(v) then return false end
      end  -- End of (k~='n')
    end -- End of k,v not an indexed pair
  end  -- End of loop across all pairs
  return true, maxIndex
end

function isEncodable(o)
  local t = base.type(o)
  return (t=='string' or t=='boolean' or t=='number' or t=='nil' or t=='table') or (t=='function' and o==null)
end

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

-- ComputerCraft IRC bot code begins here

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
local exeTime = 120
local defaultNick = "cc-turtle-bot"..tostring(math.random(1,1000))
local nick = defaultNick
local newNick = ""

local counter = 0 -- used by the qwebirc protocol for something
local sessionID = "" -- as is this, although a bit more self evident

local currentChannel = "#cctesting"
local quitReason = ""


local split
local writeResult
local send
local runCode = function(code)
        local result = "Everything went fine"
    local exe = function()
        local func,err = loadstring("return "..code)
                local succ
                if not func then
                     func,err = loadstring(code)
                end
        if func then
                     succ,err = pcall(func)
                end
        result = (succ and "Success: " or "Failed: ")..tostring(err)
    end
    local timeout = function()
        sleep(exeTime)
        result = "Operation timeout of "..tostring(exeTime).." exceeded!"
    end
    parallel.waitForAny(exe,timeout)
    return result
end


local post = function(url,data)
    local cacheAvoidance = "abc"..tostring(math.random(0,10000)) -- not sure if this is needed...
    local resp = http.post(baseUrl..dynamicUrl.."e/"..url,"r="..cacheAvoidance.."&t="..tostring(counter)..data)
    counter = counter + 1
    return resp
end

-- better responsiveness with asynchronous methods as we usually let the recv couroutine handle the responses
local request = function(url,data)
    local cacheAvoidance = "abc"..tostring(math.random(0,10000)) -- not sure if this is needed...
    http.request(baseUrl..dynamicUrl.."e/"..url,"r="..cacheAvoidance.."&t="..tostring(counter)..data)
    counter = counter + 1
end

-- these special URLs are used by the webchat server for different methods
send = function(data)
    return request("p","&s="..sessionID.."&c="..textutils.urlEncode(data))
end

local recv = function()
    return post("s","&s="..sessionID)
end

local connect = function()
    return post("n","&nick="..nick)
end

-- some helper functions
local pong = function(data)
    return send("PONG :"..data)
end

local quit = function(_reason)
    local reason = _reason or ""
    return send("QUIT :"..reason)
end

-- lua default string methods suck :/
split = function(str,sep)
        local sep, fields = sep or ":", {}
        local pattern = string.format("([^%s]+)", sep)
        str:gsub(pattern, function(c) fields[#fields+1] = c end)
        return fields
end


-- for debug

writeResult = function(data,line)
    if not (type(data) == "table") then
        return tostring(data)
    end
    for i,j in pairs(data) do
        if type(j) == "table" then
            line = writeResult(j,line.."(").."), "
        else
            line = line..tostring(j)..", "
        end
    end
    return line:sub(1,-3)
end
local lastSwitch = 0
local handleResponse = function(data)
    for i = 1, #data do
        local id = type(data) =="table" and type(data[i]) =="table" and data[i][2] or sessionID
        if id == "PING" then
            pong(data[i][4][1])
        elseif id == "PRIVMSG" then
            local senderDetails = data[i][3]
            local sender = senderDetails:sub(1,senderDetails:find("!")-1)
            local channel = data[i][4][1]:lower()
            local msg = data[i][4][2]
            if msg:sub(1,32) == "change channel of turtle bot to " and lastSwitch ~= os.day() then
                local oldChannel = currentChannel
                currentChannel = msg:sub(33,33) == "#" and msg:sub(33) or "#"..msg:sub(33)
                send("JOIN "..currentChannel)
                send("PART "..oldChannel.." [Changing channel to "..currentChannel.."]")
            end
            if msg == "update this minecraft irc bot" then
                send("QUIT Updating")
                shell.run("pastebin get 4KnCPupW .ircbot2")
                if fs.exists(".ircbot2") then
                    if fs.exists(".ircbot") then
                        fs.delete(".ircbot")
                    end
                    fs.move(".ircbot2",".ircbot")
                end
                os.reboot()
            else
                local r = runCode(msg)
                send("PRIVMSG "..currentChannel.." :"..tostring(r or "Operation successful"))
            end
            --print("<"..sender.."> "..msg)
        elseif id == "376" then
            send("JOIN "..currentChannel)
        end
    end
end

local receive = function()
    local resp = connect()
    if not resp then print(os.version()) return end
    local _data = resp.readAll()
    local data = decode(_data)
    sessionID = data[2]
    resp = recv()
    while resp do
        _data = resp.readAll()
        if #_data > 0 then
            data = decode(_data)
            handleResponse(data)
        end
        resp = recv()
    end
    quitReason = "Disconnected!"
end


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