-- 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)
-- HTTP Request Methods.
-- HTTP servers are required to implement at least the GET and HEAD methods
-- http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol#Request_methods
local httpMethods = {"GET", "HEAD", "POST", "PUT", "DELETE", "TRACE", "OPTIONS", "CONNECT", "PATCH"}
for i=1,#httpMethods do
if httpMethods[i] == method then
return method
end
end
return nil
end
local function parseRequest(request)
local result = {}
local matchEnd = 0
local matchBegin = matchEnd + 1
matchEnd = string.find (request, " ", matchBegin)
result.method = string.sub(request, matchBegin, matchEnd-1)
matchBegin = matchEnd + 1
matchEnd = string.find(request, " ", matchBegin)
result.uri = string.sub(request, matchBegin, matchEnd-1)
matchBegin = matchEnd + 1
matchEnd = string.find(request, "\r\n", matchBegin)
result.version = string.sub(request, matchBegin, matchEnd-1)
return result
end
local function uriToFilename(uri)
if uri == "/" then return "http/index.html" end
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")
connection:close()
end
local function onGet(connection, uri)
print("onGet: requested uri is: " .. uri)
local fileExists = file.open(uriToFilename(uri), "r")
if not fileExists then
onError(connection, 404, "Not Found")
else
-- Use HTTP/1.0 to ensure client closes connection.
connection:send("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\Cache-Control: private, no-store\r\n\r\n")
connection:send(file.read())
connection:close()
file.close()
end
end
local function onReceive(connection, payload)
print ("onReceive: We have a customer!")
--print(payload) -- for debugging
-- parse payload and decide what to serve.
parsedRequest = parseRequest(payload)
method = validateMethod(parsedRequest.method)
if method == nil then
onError(connection, 400, "Bad Request")
return
end
if method == "GET" then
onGet(connection, parsedRequest.uri)
return
end
onNotImplemented(connection, 501, "Not Implemented")
end
local function onSent(connection)
print ("onSent: Thank you, come again.")
end
local function handleRequest(connection)
connection:on("receive", onReceive)
connection:on("sent", onSent)
end
-- Starts web server in the specified port.
function httpserver.start(port, clientTimeoutInSeconds)
server = net.createServer(net.TCP, clientTimeoutInSeconds)
server:listen(port, handleRequest)
print("nodemcu-httpserver running at " .. port .. ":" .. wifi.sta.getip())
return server
end
-- Stops the server.
function httpserver.stop(server)
server:close()
end