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httpserver.lua
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httpserver.lua
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-- httpserver
-- Author: Marcos Kirsch
-- Starts web server in the specified port.
return function (port)
local s = net.createServer(net.TCP, 10) -- 10 seconds client timeout
s:listen(
port,
function (connection)
-- This variable holds the thread (actually a Lua coroutine) used for sending data back to the user.
-- We do it in a separate thread because we need to send in little chunks and wait for the onSent event
-- before we can send more, or we risk overflowing the mcu's buffer.
local connectionThread
local allowStatic = {GET=true, HEAD=true, POST=false, PUT=false, DELETE=false, TRACE=false, OPTIONS=false, CONNECT=false, PATCH=false}
-- Pretty log function.
local function log(connection, msg, optionalMsg)
local port, ip = connection:getpeer()
if(optionalMsg == nil) then
print(ip .. ":" .. port, msg)
else
print(ip .. ":" .. port, msg, optionalMsg)
end
end
local function startServing(fileServeFunction, connection, req, args)
connectionThread = coroutine.create(function(fileServeFunction, bufferedConnection, req, args)
fileServeFunction(bufferedConnection, req, args)
-- The bufferedConnection may still hold some data that hasn't been sent. Flush it before closing.
if not bufferedConnection:flush() then
log(connection, "closing connection", "no (more) data")
connection:close()
connectionThread = nil
collectgarbage()
end
end)
local BufferedConnectionClass = dofile("httpserver-connection.lc")
local bufferedConnection = BufferedConnectionClass:new(connection)
local status, err = coroutine.resume(connectionThread, fileServeFunction, bufferedConnection, req, args)
if not status then
log(connection, "Error: "..err)
log(connection, "closing connection", "error")
connection:close()
connectionThread = nil
collectgarbage()
end
end
local function handleRequest(connection, req)
collectgarbage()
local method = req.method
local uri = req.uri
local fileServeFunction = nil
if #(uri.file) > 32 then
-- nodemcu-firmware cannot handle long filenames.
uri.args = {code = 400, errorString = "Bad Request", logFunction = log}
fileServeFunction = dofile("httpserver-error.lc")
else
local fileExists = false
if not file.exists(uri.file) then
-- print(uri.file .. " not found, checking gz version...")
-- gzip check
if file.exists(uri.file .. ".gz") then
-- print("gzip variant exists, serving that one")
uri.file = uri.file .. ".gz"
uri.isGzipped = true
fileExists = true
end
else
fileExists = true
end
if not fileExists then
uri.args = {code = 404, errorString = "Not Found", logFunction = log}
fileServeFunction = dofile("httpserver-error.lc")
elseif uri.isScript then
fileServeFunction = dofile(uri.file)
else
if allowStatic[method] then
uri.args = {file = uri.file, ext = uri.ext, isGzipped = uri.isGzipped}
fileServeFunction = dofile("httpserver-static.lc")
else
uri.args = {code = 405, errorString = "Method not supported", logFunction = log}
fileServeFunction = dofile("httpserver-error.lc")
end
end
end
startServing(fileServeFunction, connection, req, uri.args)
end
local function onReceive(connection, payload)
collectgarbage()
local conf = dofile("httpserver-conf.lc")
local auth
local user = "Anonymous"
-- as suggest by anyn99 (https://github.com/marcoskirsch/nodemcu-httpserver/issues/36#issuecomment-167442461)
-- Some browsers send the POST data in multiple chunks.
-- Collect data packets until the size of HTTP body meets the Content-Length stated in header
if payload:find("Content%-Length:") or bBodyMissing then
if fullPayload then fullPayload = fullPayload .. payload else fullPayload = payload end
if (tonumber(string.match(fullPayload, "%d+", fullPayload:find("Content%-Length:")+16)) > #fullPayload:sub(fullPayload:find("\r\n\r\n", 1, true)+4, #fullPayload)) then
bBodyMissing = true
return
else
--print("HTTP packet assembled! size: "..#fullPayload)
payload = fullPayload
fullPayload, bBodyMissing = nil
end
end
collectgarbage()
-- parse payload and decide what to serve.
local req = dofile("httpserver-request.lc")(payload)
log(connection, req.method, req.request)
if conf.auth.enabled then
auth = dofile("httpserver-basicauth.lc")
user = auth.authenticate(payload) -- authenticate returns nil on failed auth
end
if user and req.methodIsValid and (req.method == "GET" or req.method == "POST" or req.method == "PUT") then
req.user = user
handleRequest(connection, req, handleError)
else
local args = {}
local fileServeFunction = dofile("httpserver-error.lc")
if not user then
args = {code = 401, errorString = "Not Authorized", headers = {auth.authErrorHeader()}, logFunction = log}
elseif req.methodIsValid then
args = {code = 501, errorString = "Not Implemented", logFunction = log}
else
args = {code = 400, errorString = "Bad Request", logFunction = log}
end
startServing(fileServeFunction, connection, req, args)
end
end
local function onSent(connection, payload)
collectgarbage()
if connectionThread then
local connectionThreadStatus = coroutine.status(connectionThread)
if connectionThreadStatus == "suspended" then
-- Not finished sending file, resume.
local status, err = coroutine.resume(connectionThread)
if not status then
log(connection, "Error: "..err)
log(connection, "closing connection", "error")
connection:close()
connectionThread = nil
collectgarbage()
end
elseif connectionThreadStatus == "dead" then
-- We're done sending file.
log(connection, "closing connection","thread is dead")
connection:close()
connectionThread = nil
collectgarbage()
end
end
end
local function onDisconnect(connection, payload)
-- this should rather be a log call, but log is not available here
-- print("disconnected")
if connectionThread then
connectionThread = nil
collectgarbage()
end
end
connection:on("receive", onReceive)
connection:on("sent", onSent)
connection:on("disconnection", onDisconnect)
end
)
return s
end