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- -- 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("<html><head><title>" .. errorCode .. " - " .. errorString .. "</title></head><body><h1>" .. errorCode .. " - " .. errorString .. "</h1></body></html>\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")
- -- 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
- 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
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