tgbotapi.lua

local requests = require 'requests'

local url = 'https://api.telegram.org/bot%s/%s'

local mt = {}

-- http://lua-users.org/wiki/CopyTable
local function shallowcopy(orig)
  local orig_type = type(orig)
  local copy
  if orig_type == 'table' then
      copy = {}
      for orig_key, orig_value in pairs(orig) do
          copy[orig_key] = orig_value
      end
  else -- number, string, boolean, etc
      copy = orig
  end
  return copy
end

function mt.__call(self, data)
  assert(self.method, 'self.method == nil')
  local res = requests.post{ url:format(self.token, self.method), params = data }
  return res.json()
end

function mt.__index(self, index)
  local v = rawget(self, index)
  if v ~= nil then return v end

  local t = shallowcopy(self)
  t.method = index

  local mtt = shallowcopy(getmetatable(self))
  mtt.__index = nil
  
  return setmetatable(t, mtt)
end

local function new(token)
  local bot = { token = token, method = nil }
  return setmetatable(bot, mt)
end

local token = 'your token'
local bot = new(token)
local res, err = assert(bot.getMe())
if not res.ok then
  error(tostring(res.error_code) .. ': ' .. res.description)
end
for i, k in pairs(res.result) do
  print(i, k)
end