Socket Debuggerを使ってみる！ ポート：１１！Mime Typeの簡単な実装

SocketDebugger
こことか、 https://www.udom.co.jp/sdg/
こことか、 http://sdg.ex-group.jp/lua.html
をまず見てね！

前回まででは、コンテンツはhtml文として決め打ちでしたが、今回はmime typeを指定していろいろなファイルの転送を可能とします。


これにより、ブラウザの左上にfaviconが表示されるようになったり、


CSVファイルのダウンロードなんかもできますね。


変更部分のみ

---------------------------------------------
-- http request
---------------------------------------------
function httpRequest( request )
  local len = #request
  if len < 4 then return 0 end

  local result = 0
  if request[len - 3] == 0x0D and
     request[len - 2] == 0x0A and 
     request[len - 1] == 0x0D and 
     request[len - 0] == 0x0A then
    Logput( 1, 'end of the request message.' )


    local reqStr = CharFromTbl( request )
    local lineTbl = strSplit( reqStr, "\r\n" )
    local line1Tbl = strSplit( lineTbl[1], " " )

    local methodStr = line1Tbl[1]
    local urlStr = line1Tbl[2]
    local httpVersionStr = line1Tbl[3]

    if strCmp( methodStr, 'GET' ) == 0 then
      local fileData = {}
      local mimeType = ""
      fileData, mimeType = methodGet( urlStr, httpVersionStr )
      if fileData ~= nil and mimeType ~= "" then 
        index200( fileData, mimeType )
        result = 200
      else
        index404()
        result = 404
      end
    elseif strCmp( methodStr, 'PUT' ) == 0 then
      index405()
      result = 405
    elseif strCmp( methodStr, 'POST' ) == 0 then
      index405()
      result = 405
    elseif strCmp( methodStr, 'DELETE' ) == 0 then
      index405()
      result = 405
    else
      index400()
      result = 400
    end

  end

  return result
end


---------------------------------------------
-- method get
---------------------------------------------
function methodGet( urlStr, verStr )
  local file = {}
  local methodTbl = 
  {
    { url = "/",           path = "D:\\temp\\index.html", mime = "text/html" },
    { url = "/index.html", path = "D:\\temp\\index.html", mime = "text/html" },
    { url = "/index.htm",  path = "D:\\temp\\index.html", mime = "text/html" },
    { url = "/favicon.ico",  path = "D:\\temp\\favicon.ico", mime = "image/png" },
    { url = "/text.txt",  path = "D:\\temp\\text.txt", mime = "text/plain" },
    { url = "/photo1.jpg",  path = "D:\\temp\\photo1.jpg", mime = "image/jpeg" },
    { url = "/image1.png",  path = "D:\\temp\\image1.png", mime = "image/png" },
    { url = "/image2.bmp",  path = "D:\\temp\\image2.bmp", mime = "image/bmp" },
    { url = "/test.csv",  path = "D:\\temp\\test.csv", mime = "text/csv" },
--    { url = "/test.bin",  path = "D:\\temp\\test.bin", mime = "application/octet-stream" },
  }


  for i = 1, #methodTbl do
    if strCmp( urlStr, methodTbl[i].url ) == 0 then
      file = FileRead( methodTbl[i].path )
      return file, methodTbl[i].mime
    end
  end


  return nil,""
end


---------------------------------------------
-- http request status code = 200
---------------------------------------------
function index200( data, mimeType )
  local contentLength = #data
  local contentHeader = 'HTTP/1.1 200 OK\r\n'
    .. 'Server: SocketeEbugger Web Server/ ver.0.1\r\n'
    .. 'Content-Type: ' .. mimeType .. ' charset=UTF-8\r\n'
    .. 'Content-Length: ' .. contentLength
    .. '\r\n'
    .. 'Connection: close\r\n\r\n'

  SendData( contentHeader )
  SendData( data )
end

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