d73bd73211
Reduced MIME types list to save memory Fixed argument parsing! this is biggie General cleanup and bugfixes
129 lines
4.2 KiB
Lua
129 lines
4.2 KiB
Lua
-- httpserver
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-- Author: Marcos Kirsch
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module("httpserver", package.seeall)
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-- Functions below aren't part of the public API
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-- Clients don't need to worry about them.
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-- given an HTTP method, returns it or if invalid returns nil
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local function validateMethod(method)
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local httpMethods = {GET=true, HEAD=true, POST=true, PUT=true, DELETE=true, TRACE=true, OPTIONS=true, CONNECT=true, PATCH=true}
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if httpMethods[method] then return method else return nil end
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end
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local function parseRequest(request)
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local e = request:find("\r\n", 1, true)
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if not e then return nil end
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local line = request:sub(1, e - 1)
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local r = {}
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_, i, r.method, r.uri = line:find("^([A-Z]+) (.-) HTTP/[1-9]+.[1-9]+$")
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return r
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end
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local function uriToFilename(uri)
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return "http/" .. string.sub(uri, 2, -1)
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end
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local function onError(connection, errorCode, errorString)
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print(errorCode .. ": " .. errorString)
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connection:send("HTTP/1.0 " .. errorCode .. " " .. errorString .. "\r\nContent-Type: text/html\r\nConnection: close\r\n\r\n")
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connection:send("<html><head><title>" .. errorCode .. " - " .. errorString .. "</title></head><body><h1>" .. errorCode .. " - " .. errorString .. "</h1></body></html>\r\n")
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end
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local function parseArgs(args)
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local r = {}; i=1
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if args == nil or args == "" then return r end
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for arg in string.gmatch(args, "([^&]+)") do
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local name, value = string.match(arg, "(.*)=(.*)")
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if name ~= nil then r[name] = value end
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i = i + 1
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end
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return r
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end
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local function parseUri(uri)
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local r = {}
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if uri == nil then return r end
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if uri == "/" then uri = "/index.html" end
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questionMarkPos, b, c, d, e, f = uri:find("?")
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if questionMarkPos == nil then
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r.file = uri:sub(1, questionMarkPos)
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r.args = {}
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else
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r.file = uri:sub(1, questionMarkPos - 1)
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r.args = parseArgs(uri:sub(questionMarkPos+1, #uri))
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end
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_, r.ext = r.file:match("(.+)%.(.+)")
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r.isScript = r.ext == "lua" or r.ext == "lc"
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r.file = uriToFilename(r.file)
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return r
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end
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local function getMimeType(ext)
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-- A few MIME types. No need to go crazy in this list. If you need something that is missing, let's add it.
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local mt = {}
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mt.css = "text/css"
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mt.gif = "image/gif"
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mt.html = "text/html"
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mt.ico = "image/x-icon"
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mt.jpeg = "image/jpeg"
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mt.jpg = "image/jpeg"
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mt.js = "application/javascript"
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mt.png = "image/png"
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if mt[ext] then return mt[ext] end
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-- default to text.
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return "text/plain"
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end
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local function onGet(connection, uri)
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local uri = parseUri(uri)
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local fileExists = file.open(uri.file, "r")
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if not fileExists then
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onError(connection, 404, "Not Found")
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else
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if uri.isScript then
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file.close()
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collectgarbage()
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dofile(uri.file)(connection, uri.args)
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else
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-- Use HTTP/1.0 to ensure client closes connection.
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connection:send("HTTP/1.0 200 OK\r\nContent-Type: " .. getMimeType(uri.ext) .. "\r\Cache-Control: private, no-store\r\n\r\n")
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-- Send file in little 128-byte chunks
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while true do
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local chunk = file.read(128)
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if chunk == nil then break end
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connection:send(chunk)
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end
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file.close()
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end
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end
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collectgarbage()
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end
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local function onReceive(connection, payload)
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--print(payload) -- for debugging
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-- parse payload and decide what to serve.
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local req = parseRequest(payload)
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print("Requested URI: " .. req.uri)
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req.method = validateMethod(req.method)
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if req.method == nil then onError(connection, 400, "Bad Request")
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elseif req.method == "GET" then onGet(connection, req.uri)
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else onError(connection, 501, "Not Implemented") end
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connection:close()
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end
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local function handleRequest(connection)
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connection:on("receive", onReceive)
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end
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-- Starts web server in the specified port.
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function httpserver.start(port, clientTimeoutInSeconds)
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s = net.createServer(net.TCP, clientTimeoutInSeconds)
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s:listen(port, handleRequest)
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print("nodemcu-httpserver running at " .. wifi.sta.getip() .. ":" .. port)
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return s
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end
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