1/* Part of SWI-Prolog 2 3 Author: Jan Wielemaker 4 E-mail: J.Wielemaker@vu.nl 5 WWW: http://www.swi-prolog.org 6 Copyright (c) 2002-2014, University of Amsterdam 7 VU University Amsterdam 8 All rights reserved. 9 10 Redistribution and use in source and binary forms, with or without 11 modification, are permitted provided that the following conditions 12 are met: 13 14 1. Redistributions of source code must retain the above copyright 15 notice, this list of conditions and the following disclaimer. 16 17 2. Redistributions in binary form must reproduce the above copyright 18 notice, this list of conditions and the following disclaimer in 19 the documentation and/or other materials provided with the 20 distribution. 21 22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 28 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 29 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 30 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 32 ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 POSSIBILITY OF SUCH DAMAGE. 34*/ 35 36:- module(mimetype, 37 [ file_mime_type/2 % +Path, -Type 38 ]). 39 40/** <module> Determine mime-type for a file 41 42Simple library to guess the mime-type from the extension of a file. As 43various applications need to do this type ofinferencing it seems 44worthwhile to place this functionality in an extensible library. 45 46@tbd Consider content handling (using the Unix file command) 47@tbd Allow parameters? (e.g. text/html; charset=UTF-8) 48*/ 49 50%! file_mime_type(+FileName, -MimeType) is semidet. 51% 52% True when MimeType is the mime-type to be used for sending 53% FileName. The default rules can be overridden and extended using 54% the hook mime:mime_extension/2. 55% 56% @param MimeType is a compound term of the form Type/SubType. 57 58file_mime_type(File, MimeType) :- 59 file_name_extension(_, Ext, File), 60 ( current_prolog_flag(windows, true) 61 -> downcase_atom(Ext, Lower), 62 mime_extension(Lower, MimeType) 63 ; mime_extension(Ext, M0) 64 -> MimeType = M0 65 ; downcase_atom(Ext, Lower), 66 mime_extension(Lower, MimeType) 67 ), 68 !. 69file_mime_type(File, MimeType) :- 70 file_base_name(File, Base), 71 downcase_atom(Base, Lower), 72 name_mimetype(Lower, Mime), 73 !, 74 MimeType = Mime. 75file_mime_type(_, MimeType) :- 76 default_mimetype(MimeType). 77 78%! mime:mime_extension(+Ext, -MimeType) is semidet. 79% 80% Hook that is called by file_mime_type/2 before the default table 81% is examined. 82 83:- multifile 84 mime:mime_extension/2. 85 86mime_extension(Ext, MimeType) :- 87 ( mime:mime_extension(Ext, Mime) 88 -> MimeType = Mime 89 ; ext_mimetype(Ext, Mime) 90 -> MimeType = Mime 91 ). 92 93%! default_mimetype(-MimeType) is semidet. 94% 95% If the mime-type cannot be determined from the file extension, 96% this predicate is used as fallback. It takes the value from the 97% Prolog flag =default_mimetype=. To change the default, use e.g., 98% 99% == 100% :- set_prolog_flag(default_mimetype, text/plain). 101% == 102% 103% The initial default mime-type is =|application/unknown|=. Use 104% the value =|-|= to denote there is no default. 105 106:- create_prolog_flag(default_mimetype, application/unknown, []). 107 108default_mimetype(MimeType) :- 109 current_prolog_flag(default_mimetype, MimeType), 110 MimeType = _/_. 111 112 113%! ext_mimetype(+Extension, -MimeType) is semidet. 114% 115% Built-in table of file-name extension to mime-type mappings. 116% 117% @tbd Update this list, e.g., from 118% http://www.webmaster-toolkit.com/mime-types.shtml 119 120 % plain text 121ext_mimetype(txt, text/plain). 122 % markup 123ext_mimetype(htm, text/html). 124ext_mimetype(html, text/html). 125ext_mimetype(xhtml, application/'xhtml+xml'). 126ext_mimetype(sgml, text/'x-sgml'). 127ext_mimetype(sgm, text/'x-sgml'). 128ext_mimetype(xml, text/xml). 129ext_mimetype(css, text/css). 130ext_mimetype(xsl, text/xml). % Unclear what this should be. 131ext_mimetype(md, text/'x-markdown'). 132 % semantic web stuff 133ext_mimetype(rdf, application/'rdf+xml'). 134ext_mimetype(rdfs, application/'rdf+xml'). 135ext_mimetype(owl, application/'rdf+xml'). 136ext_mimetype(ttl, application/turtle). 137ext_mimetype(nt, application/'n-triples'). 138ext_mimetype(nq, application/'n-quads'). 139 % Prolog source 140ext_mimetype(pl, text/plain). 141 % Other languages 142ext_mimetype(c, text/'x-c'). 143ext_mimetype(h, text/'x-c'). 144ext_mimetype(cc, text/'x-c'). 145ext_mimetype(py, text/'x-python'). 146ext_mimetype(java, text/'x-java'). 147ext_mimetype(sh, text/plain). 148 % Packaged formats 149ext_mimetype(gz, application/'x-gzip'). 150ext_mimetype(zip, application/zip). 151ext_mimetype(tgz, application/'x-gtar'). 152 % Some document formats 153ext_mimetype(pdf, application/pdf). 154ext_mimetype(doc, application/msword). 155 % Java classes 156ext_mimetype(class, application/'octet-stream'). 157ext_mimetype(jar, application/'x-java-archive'). 158 % JavaScript 159ext_mimetype(js, text/javascript). 160 % Visual Basic Script :-( 161ext_mimetype(vbs, text/vbscript). 162 % Some image formats 163ext_mimetype(jpg, image/jpeg). 164ext_mimetype(jpeg, image/jpeg). 165ext_mimetype(gif, image/gif). 166ext_mimetype(png, image/png). 167ext_mimetype(tif, image/tiff). 168ext_mimetype(tiff, image/tiff). 169ext_mimetype(xpm, image/'x-xpixmap'). 170ext_mimetype(ico, image/'x-ico'). 171ext_mimetype(svg, image/'svg+xml'). 172 % Google earth 173ext_mimetype(kml, application/'vnd.google-earth.kml+xml'). 174ext_mimetype(kmz, application/'vnd.google-earth.kmz'). 175 176 % Flash 177ext_mimetype(swf, application/'x-shockwave-flash'). 178ext_mimetype(flv, video/'x-flv'). 179 % MP3 180ext_mimetype(mp3, audio/mpeg). 181 % Downloads 182ext_mimetype(rpm, application/'x-rpm'). 183ext_mimetype(exe, application/'x-executable'). 184 185%! name_mimetype(+DownCaseFileName, -MimeType) is semidet. 186% 187% Determine the mime-type of files based on the entire filename. 188 189name_mimetype(makefile, text/plain). 190name_mimetype(configure, text/plain). 191name_mimetype('configure.in', text/plain). 192name_mimetype('makefile.in', text/plain). 193name_mimetype('readme.in', text/plain).