--
-- lovebird
--
-- Copyright (c) 2017 rxi
--
-- This library is free software; you can redistribute it and/or modify it
-- under the terms of the MIT license. See LICENSE for details.
--
local socket = require "socket"
local lovebird = { _version = "0.4.3" }
lovebird.loadstring = loadstring or load
lovebird.inited = false
lovebird.host = "*"
lovebird.buffer = ""
lovebird.lines = {}
lovebird.connections = {}
lovebird.pages = {}
lovebird.wrapprint = true
lovebird.timestamp = true
lovebird.allowhtml = false
lovebird.echoinput = true
lovebird.port = 8000
lovebird.whitelist = { "127.0.0.1" }
lovebird.maxlines = 200
lovebird.updateinterval = .5
lovebird.pages["index"] = [[
lovebird
]]
lovebird.pages["buffer"] = [[ ]]
lovebird.pages["env.json"] = [[
{
"valid": true,
"path": "",
"vars": [
{
"key": "",
"value": ,
"type": "",
},
]
}
]]
function lovebird.init()
-- Init server
lovebird.server = assert(socket.bind(lovebird.host, lovebird.port))
lovebird.addr, lovebird.port = lovebird.server:getsockname()
lovebird.server:settimeout(0)
-- Wrap print
lovebird.origprint = print
if lovebird.wrapprint then
local oldprint = print
print = function(...)
oldprint(...)
lovebird.print(...)
end
end
-- Compile page templates
for k, page in pairs(lovebird.pages) do
lovebird.pages[k] = lovebird.template(page, "lovebird, req",
"pages." .. k)
end
lovebird.inited = true
end
function lovebird.template(str, params, chunkname)
params = params and ("," .. params) or ""
local f = function(x) return string.format(" echo(%q)", x) end
str = ("?>"..str.."(.-)<%?lua", f)
str = "local echo " .. params .. " = ..." .. str
local fn = assert(lovebird.loadstring(str, chunkname))
return function(...)
local output = {}
local echo = function(str) table.insert(output, str) end
fn(echo, ...)
return table.concat(lovebird.map(output, tostring))
end
end
function lovebird.map(t, fn)
local res = {}
for k, v in pairs(t) do res[k] = fn(v) end
return res
end
function lovebird.trace(...)
local str = "[lovebird] " .. table.concat(lovebird.map({...}, tostring), " ")
print(str)
if not lovebird.wrapprint then lovebird.print(str) end
end
function lovebird.unescape(str)
local f = function(x) return string.char(tonumber("0x"..x)) end
return (str:gsub("%+", " "):gsub("%%(..)", f))
end
function lovebird.parseurl(url)
local res = {}
res.path, res.search = url:match("/([^%?]*)%??(.*)")
res.query = {}
for k, v in res.search:gmatch("([^&^?]-)=([^&^#]*)") do
res.query[k] = lovebird.unescape(v)
end
return res
end
local htmlescapemap = {
["<"] = "<",
["&"] = "&",
['"'] = """,
["'"] = "'",
}
function lovebird.htmlescape(str)
return ( str:gsub("[<&\"']", htmlescapemap) )
end
function lovebird.truncate(str, len)
if #str <= len then
return str
end
return str:sub(1, len - 3) .. "..."
end
function lovebird.compare(a, b)
local na, nb = tonumber(a), tonumber(b)
if na then
if nb then return na < nb end
return false
elseif nb then
return true
end
return tostring(a) < tostring(b)
end
function lovebird.checkwhitelist(addr)
if lovebird.whitelist == nil then return true end
for _, a in pairs(lovebird.whitelist) do
local ptn = "^" .. a:gsub("%.", "%%."):gsub("%*", "%%d*") .. "$"
if addr:match(ptn) then return true end
end
return false
end
function lovebird.clear()
lovebird.lines = {}
lovebird.buffer = ""
end
function lovebird.pushline(line)
line.time = os.time()
line.count = 1
table.insert(lovebird.lines, line)
if #lovebird.lines > lovebird.maxlines then
table.remove(lovebird.lines, 1)
end
lovebird.recalcbuffer()
end
function lovebird.recalcbuffer()
local function doline(line)
local str = line.str
if not lovebird.allowhtml then
str = lovebird.htmlescape(line.str):gsub("\n", "
")
end
if line.type == "input" then
str = '' .. str .. ''
else
if line.type == "error" then
str = '! ' .. str
str = '' .. str .. ''
end
if line.count > 1 then
str = '' .. line.count .. ' ' .. str
end
if lovebird.timestamp then
str = os.date('%H:%M:%S ', line.time) ..
str
end
end
return str
end
lovebird.buffer = table.concat(lovebird.map(lovebird.lines, doline), "
")
end
function lovebird.print(...)
local t = {}
for i = 1, select("#", ...) do
table.insert(t, tostring(select(i, ...)))
end
local str = table.concat(t, " ")
local last = lovebird.lines[#lovebird.lines]
if last and str == last.str then
-- Update last line if this line is a duplicate of it
last.time = os.time()
last.count = last.count + 1
lovebird.recalcbuffer()
else
-- Create new line
lovebird.pushline({ type = "output", str = str })
end
end
function lovebird.onerror(err)
lovebird.pushline({ type = "error", str = err })
if lovebird.wrapprint then
lovebird.origprint("[lovebird] ERROR: " .. err)
end
end
function lovebird.onrequest(req, client)
local page = req.parsedurl.path
page = page ~= "" and page or "index"
-- Handle "page not found"
if not lovebird.pages[page] then
return "HTTP/1.1 404\r\nContent-Length: 8\r\n\r\nBad page"
end
-- Handle page
local str
xpcall(function()
local data = lovebird.pages[page](lovebird, req)
local contenttype = "text/html"
if string.match(page, "%.json$") then
contenttype = "application/json"
end
str = "HTTP/1.1 200 OK\r\n" ..
"Content-Type: " .. contenttype .. "\r\n" ..
"Content-Length: " .. #data .. "\r\n" ..
"\r\n" .. data
end, lovebird.onerror)
return str
end
function lovebird.receive(client, pattern)
while 1 do
local data, msg = client:receive(pattern)
if not data then
if msg == "timeout" then
-- Wait for more data
coroutine.yield(true)
else
-- Disconnected -- yielding nil means we're done
coroutine.yield(nil)
end
else
return data
end
end
end
function lovebird.send(client, data)
local idx = 1
while idx < #data do
local res, msg = client:send(data, idx)
if not res and msg == "closed" then
-- Handle disconnect
coroutine.yield(nil)
else
idx = idx + res
coroutine.yield(true)
end
end
end
function lovebird.onconnect(client)
-- Create request table
local requestptn = "(%S*)%s*(%S*)%s*(%S*)"
local req = {}
req.socket = client
req.addr, req.port = client:getsockname()
req.request = lovebird.receive(client, "*l")
req.method, req.url, req.proto = req.request:match(requestptn)
req.headers = {}
while 1 do
local line, msg = lovebird.receive(client, "*l")
if not line or #line == 0 then break end
local k, v = line:match("(.-):%s*(.*)$")
req.headers[k] = v
end
if req.headers["Content-Length"] then
req.body = lovebird.receive(client, req.headers["Content-Length"])
end
-- Parse body
req.parsedbody = {}
if req.body then
for k, v in req.body:gmatch("([^&]-)=([^&^#]*)") do
req.parsedbody[k] = lovebird.unescape(v)
end
end
-- Parse request line's url
req.parsedurl = lovebird.parseurl(req.url)
-- Handle request; get data to send and send
local data = lovebird.onrequest(req)
lovebird.send(client, data)
-- Clear up
client:close()
end
function lovebird.update()
if not lovebird.inited then lovebird.init() end
-- Handle new connections
while 1 do
-- Accept new connections
local client = lovebird.server:accept()
if not client then break end
client:settimeout(0)
local addr = client:getsockname()
if lovebird.checkwhitelist(addr) then
-- Connection okay -- create and add coroutine to set
local conn = coroutine.wrap(function()
xpcall(function() lovebird.onconnect(client) end, function() end)
end)
lovebird.connections[conn] = true
else
-- Reject connection not on whitelist
lovebird.trace("got non-whitelisted connection attempt: ", addr)
client:close()
end
end
-- Handle existing connections
for conn in pairs(lovebird.connections) do
-- Resume coroutine, remove if it has finished
local status = conn()
if status == nil then
lovebird.connections[conn] = nil
end
end
end
return lovebird