modules/luci-base/luasrc/http/protocol/mime.lua

   1 -- Copyright 2008 Freifunk Leipzig / Jo-Philipp Wich <xm@leipzig.freifunk.net>
   2 -- Licensed to the public under the Apache License 2.0.
   3
   4 --- LuCI http protocol implementation - mime helper class.
   5 -- This class provides functions to guess mime types from file extensions and
   6 -- vice versa.
   7 module("luci.http.protocol.mime", package.seeall)
   8
   9 require("luci.util")
  10
  11 --- MIME mapping table containg extension - mimetype relations.
  12 -- @class table
  13 MIME_TYPES = {
  14     ["txt"]   = "text/plain";
  15     ["js"]    = "text/javascript";
  16     ["css"]   = "text/css";
  17     ["htm"]   = "text/html";
  18     ["html"]  = "text/html";
  19     ["patch"] = "text/x-patch";
  20     ["c"]     = "text/x-csrc";
  21     ["h"]     = "text/x-chdr";
  22     ["o"]     = "text/x-object";
  23     ["ko"]    = "text/x-object";
  24
  25     ["bmp"]   = "image/bmp";
  26     ["gif"]   = "image/gif";
  27     ["png"]   = "image/png";
  28     ["jpg"]   = "image/jpeg";
  29     ["jpeg"]  = "image/jpeg";
  30     ["svg"]   = "image/svg+xml";
  31
  32     ["zip"]   = "application/zip";
  33     ["pdf"]   = "application/pdf";
  34     ["xml"]   = "application/xml";
  35     ["xsl"]   = "application/xml";
  36     ["doc"]   = "application/msword";
  37     ["ppt"]   = "application/vnd.ms-powerpoint";
  38     ["xls"]   = "application/vnd.ms-excel";
  39     ["odt"]   = "application/vnd.oasis.opendocument.text";
  40     ["odp"]   = "application/vnd.oasis.opendocument.presentation";
  41     ["pl"]    = "application/x-perl";
  42     ["sh"]    = "application/x-shellscript";
  43     ["php"]   = "application/x-php";
  44     ["deb"]   = "application/x-deb";
  45     ["iso"]   = "application/x-cd-image";
  46     ["tgz"]   = "application/x-compressed-tar";
  47
  48     ["mp3"]   = "audio/mpeg";
  49     ["ogg"]   = "audio/x-vorbis+ogg";
  50     ["wav"]   = "audio/x-wav";
  51
  52     ["mpg"]   = "video/mpeg";
  53     ["mpeg"]  = "video/mpeg";
  54     ["avi"]   = "video/x-msvideo";
  55 }
  56
  57 --- Extract extension from a filename and return corresponding mime-type or
  58 -- "application/octet-stream" if the extension is unknown.
  59 -- @param filename      The filename for which the mime type is guessed
  60 -- @return                      String containign the determined mime type
  61 function to_mime(filename)
  62         if type(filename) == "string" then
  63                 local ext = filename:match("[^%.]+$")
  64
  65                 if ext and MIME_TYPES[ext:lower()] then
  66                         return MIME_TYPES[ext:lower()]
  67                 end
  68         end
  69
  70         return "application/octet-stream"
  71 end
  72
  73 --- Return corresponding extension for a given mime type or nil if the
  74 -- given mime-type is unknown.
  75 -- @param mimetype      The mimetype to retrieve the extension from
  76 -- @return                      String with the extension or nil for unknown type
  77 function to_ext(mimetype)
  78         if type(mimetype) == "string" then
  79                 for ext, type in luci.util.kspairs( MIME_TYPES ) do
  80                         if type == mimetype then
  81                                 return ext
  82                         end
  83                 end
  84         end
  85
  86         return nil
  87 end