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-- httpserver-request

-- Part of nodemcu-httpserver, parses incoming client requests.

-- Author: Marcos Kirsch

local function validateMethod(method)

local httpMethods = {GET=true, HEAD=true, POST=true, PUT=true, DELETE=true, TRACE=true, OPTIONS=true, CONNECT=true, PATCH=true}

-- default for non-existent attributes returns nil, which evaluates to false

return httpMethods[method]

end

local function uriToFilename(uri)

return "http/" .. string.sub(uri, 2, -1)

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 = {}

local filename

local ext

local fullExt = {}

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

filename = r.file

while filename:match("%.") do

filename,ext = filename:match("(.+)%.(.+)")

table.insert(fullExt,1,ext)

end

r.ext = table.concat(fullExt,".")

r.isScript = r.ext == "lua" or r.ext == "lc"

r.file = uriToFilename(r.file)

return r

end

-- Parses the client's request. Returns a dictionary containing pretty much everything

-- the server needs to know about the uri.

return function (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.request = line:find("^([A-Z]+) (.-) HTTP/[1-9]+.[0-9]+$")

r.methodIsValid = validateMethod(r.method)

r.uri = parseUri(r.request)

return r

end