-- httpserver
-- Author: Marcos Kirsch
module("httpserver", package.seeall)
-- Functions below aren't part of the public API
-- Clients don't need to worry about them.
-- given an HTTP method, returns it or if invalid returns nil
local function validateMethod(method)
local httpMethods = {GET=true, HEAD=true, POST=true, PUT=true, DELETE=true, TRACE=true, OPTIONS=true, CONNECT=true, PATCH=true}
if httpMethods[method] then return method else return nil end
end
local function parseRequest(request)
local e = request:find("\r\n", 1, true)
if not e then return nil end
local line = request:sub(1, e - 1)
local r = {}
_, i, r.method, r.uri = line:find("^([A-Z]+) (.-) HTTP/[1-9]+.[1-9]+$")
return r
end
local function uriToFilename(uri)
return "http/" .. string.sub(uri, 2, -1)
end
local function onError(connection, errorCode, errorString)
print(errorCode .. ": " .. errorString)
connection:send("HTTP/1.0 " .. errorCode .. " " .. errorString .. "\r\nContent-Type: text/html\r\nConnection: close\r\n\r\n")
connection:send("" .. errorCode .. " - " .. errorString .. "" .. errorCode .. " - " .. errorString .. "
\r\n")
end
local function parseArgs(args)
local r = {}; i=1
if args == nil or args == "" then return r end
for arg in string.gmatch(args, "([^&]+)") do
local name, value = string.match(arg, "(.*)=(.*)")
if name ~= nil then r[name] = value end
i = i + 1
end
return r
end
local function parseUri(uri)
local r = {}
if uri == nil then return r end
if uri == "/" then uri = "/index.html" end
questionMarkPos, b, c, d, e, f = uri:find("?")
if questionMarkPos == nil then
r.file = uri:sub(1, questionMarkPos)
r.args = {}
else
r.file = uri:sub(1, questionMarkPos - 1)
r.args = parseArgs(uri:sub(questionMarkPos+1, #uri))
end
_, r.ext = r.file:match("(.+)%.(.+)")
r.isScript = r.ext == "lua" or r.ext == "lc"
r.file = uriToFilename(r.file)
return r
end
local function getMimeType(ext)
-- A few MIME types. No need to go crazy in this list. If you need something that is missing, let's add it.
local mt = {}
mt.css = "text/css"
mt.gif = "image/gif"
mt.html = "text/html"
mt.ico = "image/x-icon"
mt.jpeg = "image/jpeg"
mt.jpg = "image/jpeg"
mt.js = "application/javascript"
mt.png = "image/png"
if mt[ext] then return mt[ext] end
-- default to text.
return "text/plain"
end
local function onGet(connection, uri)
local uri = parseUri(uri)
local fileExists = file.open(uri.file, "r")
if not fileExists then
onError(connection, 404, "Not Found")
else
if uri.isScript then
file.close()
collectgarbage()
dofile(uri.file)(connection, uri.args)
else
-- Use HTTP/1.0 to ensure client closes connection.
connection:send("HTTP/1.0 200 OK\r\nContent-Type: " .. getMimeType(uri.ext) .. "\r\Cache-Control: private, no-store\r\n\r\n")
-- Send file in little 128-byte chunks
while true do
local chunk = file.read(128)
if chunk == nil then break end
connection:send(chunk)
end
file.close()
end
end
collectgarbage()
end
local function onReceive(connection, payload)
--print(payload) -- for debugging
-- parse payload and decide what to serve.
local req = parseRequest(payload)
print("Requested URI: " .. req.uri)
req.method = validateMethod(req.method)
if req.method == nil then onError(connection, 400, "Bad Request")
elseif req.method == "GET" then onGet(connection, req.uri)
else onError(connection, 501, "Not Implemented") end
connection:close()
end
local function handleRequest(connection)
connection:on("receive", onReceive)
end
-- Starts web server in the specified port.
function httpserver.start(port, clientTimeoutInSeconds)
s = net.createServer(net.TCP, clientTimeoutInSeconds)
s:listen(port, handleRequest)
print("nodemcu-httpserver running at " .. wifi.sta.getip() .. ":" .. port)
return s
end