libs/http/luasrc/http/protocol/mime.lua

   1 --[[
   2
   3 HTTP protocol implementation for LuCI - mime handling
   4 (c) 2008 Freifunk Leipzig / Jo-Philipp Wich <xm@leipzig.freifunk.net>
   5
   6 Licensed under the Apache License, Version 2.0 (the "License");
   7 you may not use this file except in compliance with the License.
   8 You may obtain a copy of the License at
   9
  10         http://www.apache.org/licenses/LICENSE-2.0
  11
  12 $Id$
  13
  14 ]]--
  15
  16 module("luci.http.protocol.mime", package.seeall)
  17
  18 require("luci.util")
  19
  20
  21 -- MIME mapping
  22 MIME_TYPES = {
  23     ["txt"]   = "text/plain";
  24     ["js"]    = "text/javascript";
  25     ["css"]   = "text/css";
  26     ["htm"]   = "text/html";
  27     ["html"]  = "text/html";
  28     ["patch"] = "text/x-patch";
  29     ["c"]     = "text/x-csrc";
  30     ["h"]     = "text/x-chdr";
  31     ["o"]     = "text/x-object";
  32     ["ko"]    = "text/x-object";
  33
  34     ["bmp"]   = "image/bmp";
  35     ["gif"]   = "image/gif";
  36     ["png"]   = "image/png";
  37     ["jpg"]   = "image/jpeg";
  38     ["jpeg"]  = "image/jpeg";
  39     ["svg"]   = "image/svg+xml";
  40
  41     ["zip"]   = "application/zip";
  42     ["pdf"]   = "application/pdf";
  43     ["xml"]   = "application/xml";
  44     ["doc"]   = "application/msword";
  45     ["ppt"]   = "application/vnd.ms-powerpoint";
  46     ["xls"]   = "application/vnd.ms-excel";
  47     ["odt"]   = "application/vnd.oasis.opendocument.text";
  48     ["odp"]   = "application/vnd.oasis.opendocument.presentation";
  49     ["pl"]    = "application/x-perl";
  50     ["sh"]    = "application/x-shellscript";
  51     ["php"]   = "application/x-php";
  52     ["deb"]   = "application/x-deb";
  53     ["iso"]   = "application/x-cd-image";
  54     ["tgz"]   = "application/x-compressed-tar";
  55
  56     ["mp3"]   = "audio/mpeg";
  57     ["ogg"]   = "audio/x-vorbis+ogg";
  58     ["wav"]   = "audio/x-wav";
  59
  60     ["mpg"]   = "video/mpeg";
  61     ["mpeg"]  = "video/mpeg";
  62     ["avi"]   = "video/x-msvideo";
  63 }
  64
  65 -- extract extension from a filename and return corresponding mime-type or
  66 -- "application/octet-stream" if the extension is unknown
  67 function to_mime(filename)
  68         if type(filename) == "string" then
  69                 local ext = filename:match("[^%.]+$")
  70
  71                 if ext and MIME_TYPES[ext:lower()] then
  72                         return MIME_TYPES[ext:lower()]
  73                 end
  74         end
  75
  76         return "application/octet-stream"
  77 end
  78
  79 -- return corresponding extension for a given mime type or nil if the
  80 -- given mime-type is unknown
  81 function to_ext(mimetype)
  82         if type(mimetype) == "string" then
  83                 for ext, type in luci.util.kspairs( MIME_TYPES ) do
  84                         if type == mimetype then
  85                                 return ext
  86                         end
  87                 end
  88         end
  89
  90         return nil
  91 end