115 lines
3.3 KiB
Lua
115 lines
3.3 KiB
Lua
-- httpserver-request
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-- Part of nodemcu-httpserver, parses incoming client requests.
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-- Author: Marcos Kirsch
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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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-- default for non-existent attributes returns nil, which evaluates to false
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return httpMethods[method]
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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 hex_to_char(x)
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return string.char(tonumber(x, 16))
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end
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local function uri_decode(input)
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return input:gsub("%+", " "):gsub("%%(%x%x)", hex_to_char)
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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] = uri_decode(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 parseFormData(body)
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local data = {}
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print("Parsing Form Data")
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for kv in body.gmatch(body, "%s*&?([^=]+=[^&]+)") do
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local key, value = string.match(kv, "(.*)=(.*)")
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print("Parsed: " .. key .. " => " .. value)
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data[key] = uri_decode(value)
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end
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return data
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end
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local function getRequestData(payload)
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local requestData
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return function ()
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print("Getting Request Data")
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if requestData then
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return requestData
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else
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local mimeType = string.match(payload, "Content%-Type: (%S+)\r\n")
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local body_start = payload:find("\r\n\r\n", 1, true)
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local body = payload:sub(body_start, #payload)
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payload = nil
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collectgarbage()
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-- print("mimeType = [" .. mimeType .. "]")
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if mimeType == "application/json" then
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print("JSON: " .. body)
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requestData = cjson.decode(body)
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elseif mimeType == "application/x-www-form-urlencoded" then
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requestData = parseFormData(body)
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else
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requestData = {}
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end
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return requestData
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end
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end
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end
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local function parseUri(uri)
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local r = {}
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local filename
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local ext
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local fullExt = {}
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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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filename = r.file
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while filename:match("%.") do
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filename,ext = filename:match("(.+)%.(.+)")
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table.insert(fullExt,1,ext)
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end
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r.ext = table.concat(fullExt,".")
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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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-- Parses the client's request. Returns a dictionary containing pretty much everything
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-- the server needs to know about the uri.
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return function (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.request = line:find("^([A-Z]+) (.-) HTTP/[1-9]+.[0-9]+$")
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r.methodIsValid = validateMethod(r.method)
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r.uri = parseUri(r.request)
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r.getRequestData = getRequestData(request)
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return r
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end
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