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 --- LuCI http protocol implementation - mime helper class.
  17 -- This class provides functions to guess mime types from file extensions and
  18 -- vice versa.
  19 module("luci.http.protocol.mime", package.seeall)
  20
  21 require("luci.util")
  22
  23 --- MIME mapping table containg extension - mimetype relations.
  24 -- @class table
  25 MIME_TYPES = {
  26     ["txt"]   = "text/plain";
  27     ["js"]    = "text/javascript";
  28     ["css"]   = "text/css";
  29     ["htm"]   = "text/html";
  30     ["html"]  = "text/html";
  31     ["patch"] = "text/x-patch";
  32     ["c"]     = "text/x-csrc";
  33     ["h"]     = "text/x-chdr";
  34     ["o"]     = "text/x-object";
  35     ["ko"]    = "text/x-object";
  36
  37     ["bmp"]   = "image/bmp";
  38     ["gif"]   = "image/gif";
  39     ["png"]   = "image/png";
  40     ["jpg"]   = "image/jpeg";
  41     ["jpeg"]  = "image/jpeg";
  42     ["svg"]   = "image/svg+xml";
  43
  44     ["zip"]   = "application/zip";
  45     ["pdf"]   = "application/pdf";
  46     ["xml"]   = "application/xml";
  47     ["doc"]   = "application/msword";
  48     ["ppt"]   = "application/vnd.ms-powerpoint";
  49     ["xls"]   = "application/vnd.ms-excel";
  50     ["odt"]   = "application/vnd.oasis.opendocument.text";
  51     ["odp"]   = "application/vnd.oasis.opendocument.presentation";
  52     ["pl"]    = "application/x-perl";
  53     ["sh"]    = "application/x-shellscript";
  54     ["php"]   = "application/x-php";
  55     ["deb"]   = "application/x-deb";
  56     ["iso"]   = "application/x-cd-image";
  57     ["tgz"]   = "application/x-compressed-tar";
  58
  59     ["mp3"]   = "audio/mpeg";
  60     ["ogg"]   = "audio/x-vorbis+ogg";
  61     ["wav"]   = "audio/x-wav";
  62
  63     ["mpg"]   = "video/mpeg";
  64     ["mpeg"]  = "video/mpeg";
  65     ["avi"]   = "video/x-msvideo";
  66 }
  67
  68 --- Extract extension from a filename and return corresponding mime-type or
  69 -- "application/octet-stream" if the extension is unknown.
  70 -- @param filename      The filename for which the mime type is guessed
  71 -- @return                      String containign the determined mime type
  72 function to_mime(filename)
  73         if type(filename) == "string" then
  74                 local ext = filename:match("[^%.]+$")
  75
  76                 if ext and MIME_TYPES[ext:lower()] then
  77                         return MIME_TYPES[ext:lower()]
  78                 end
  79         end
  80
  81         return "application/octet-stream"
  82 end
  83
  84 --- Return corresponding extension for a given mime type or nil if the
  85 -- given mime-type is unknown.
  86 -- @param mimetype      The mimetype to retrieve the extension from
  87 -- @return                      String with the extension or nil for unknown type
  88 function to_ext(mimetype)
  89         if type(mimetype) == "string" then
  90                 for ext, type in luci.util.kspairs( MIME_TYPES ) do
  91                         if type == mimetype then
  92                                 return ext
  93                         end
  94                 end
  95         end
  96
  97         return nil
  98 end