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) 2002-2018, 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 file_content_type/2, % +Path, -Type 39 file_content_type/3 % +Path, ?MediaType, -Type 40 ]).
52:- multifile
53 mime:mime_extension/2,
54 mime:text_mimetype/1,
55 mime:charset/3.65file_mime_type(File, MimeType) :- 66 file_name_extension(_, Ext, File), 67 ( current_prolog_flag(windows, true) 68 -> downcase_atom(Ext, Lower), 69 mime_extension(Lower, MimeType) 70 ; mime_extension(Ext, M0) 71 -> MimeType = M0 72 ; downcase_atom(Ext, Lower), 73 mime_extension(Lower, MimeType) 74 ), 75 !. 76file_mime_type(File, MimeType) :- 77 file_base_name(File, Base), 78 downcase_atom(Base, Lower), 79 name_mimetype(Lower, Mime), 80 !, 81 MimeType = Mime. 82file_mime_type(_, MimeType) :- 83 default_mimetype(MimeType).
90mime_extension(Ext, MimeType) :-
91 ( mime:mime_extension(Ext, Mime)
92 -> MimeType = Mime
93 ; ext_mimetype(Ext, Mime)
94 -> MimeType = Mime
95 ).default_mimetype. To change the default, use e.g.,
:- set_prolog_flag(default_mimetype, text/plain).
The initial default mime-type is application/unknown. Use
the value - to denote there is no default.
110:- create_prolog_flag(default_mimetype, application/unknown, [keep(true)]). 111 112default_mimetype(MimeType) :- 113 current_prolog_flag(default_mimetype, MimeType), 114 MimeType = _/_.
124 % plain text 125ext_mimetype(txt, text/plain). 126 % markup 127ext_mimetype(htm, text/html). 128ext_mimetype(html, text/html). 129ext_mimetype(xhtml, application/'xhtml+xml'). 130ext_mimetype(sgml, text/'x-sgml'). 131ext_mimetype(sgm, text/'x-sgml'). 132ext_mimetype(xml, text/xml). 133ext_mimetype(css, text/css). 134ext_mimetype(xsl, text/xml). % Unclear what this should be. 135ext_mimetype(md, text/markdown). 136 % Other data markup 137ext_mimetype(json, application/json). 138ext_mimetype(yaml, application/yaml). % Not official 139 % semantic web stuff 140ext_mimetype(rdf, application/'rdf+xml'). 141ext_mimetype(rdfs, application/'rdf+xml'). 142ext_mimetype(owl, application/'rdf+xml'). 143ext_mimetype(ttl, application/turtle). 144ext_mimetype(nt, application/'n-triples'). 145ext_mimetype(nq, application/'n-quads'). 146 % Prolog source 147ext_mimetype(pl, text/plain). 148 % Other languages 149ext_mimetype(c, text/'x-c'). 150ext_mimetype(h, text/'x-c'). 151ext_mimetype(cc, text/'x-c'). 152ext_mimetype(py, text/'x-python'). 153ext_mimetype(java, text/'x-java'). 154ext_mimetype(sh, text/plain). 155 % Packaged formats 156ext_mimetype(gz, application/'x-gzip'). 157ext_mimetype(zip, application/zip). 158ext_mimetype(tgz, application/'x-gtar'). 159 % Some document formats 160ext_mimetype(pdf, application/pdf). 161ext_mimetype(doc, application/msword). 162 % Java classes 163ext_mimetype(class, application/'octet-stream'). 164ext_mimetype(jar, application/'x-java-archive'). 165 % JavaScript and WASM 166ext_mimetype(js, text/javascript). 167ext_mimetype(wasm, application/wasm). 168ext_mimetype(data, application/'octet-stream'). 169 % Visual Basic Script :-( 170ext_mimetype(vbs, text/vbscript). 171 % Some image formats 172ext_mimetype(jpg, image/jpeg). 173ext_mimetype(jpeg, image/jpeg). 174ext_mimetype(gif, image/gif). 175ext_mimetype(png, image/png). 176ext_mimetype(tif, image/tiff). 177ext_mimetype(tiff, image/tiff). 178ext_mimetype(xpm, image/'x-xpixmap'). 179ext_mimetype(ico, image/'x-ico'). 180ext_mimetype(svg, image/'svg+xml'). 181 % Google earth 182ext_mimetype(kml, application/'vnd.google-earth.kml+xml'). 183ext_mimetype(kmz, application/'vnd.google-earth.kmz'). 184 185 % Flash 186ext_mimetype(swf, application/'x-shockwave-flash'). 187ext_mimetype(flv, video/'x-flv'). 188 % MP3 189ext_mimetype(mp3, audio/mpeg). 190 % Downloads 191ext_mimetype(rpm, application/'x-rpm'). 192ext_mimetype(exe, application/'x-executable').
198name_mimetype(makefile, text/plain). 199name_mimetype(configure, text/plain). 200name_mimetype('configure.in', text/plain). 201name_mimetype('configure.ac', text/plain). 202name_mimetype('makefile.in', text/plain). 203name_mimetype('makefile.am', text/plain). 204name_mimetype('readme.in', text/plain).
211text_mimetype(MimeType) :- 212 mime:text_mimetype(MimeType), 213 !. 214text_mimetype(text/_).
ContentType: ContentType. It
takes the following steps:
default_charsetThe behavior is controlled by several hooks and a flag.
default_charset defines the charset unless it is set
to -. The flag set by default to UTF-8 if the Prolog
flag encoding is set to utf8.239file_content_type(File, ContentType) :- 240 file_content_type(File, _, ContentType). 241file_content_type(File, MediaType, ContentType) :- 242 ( ground(MediaType) 243 -> true 244 ; file_mime_type(File, MediaType) 245 ), 246 ( text_mimetype(MediaType), 247 ( mime:charset(File, MediaType, Charset0) 248 -> Charset = Charset0 249 ; default_charset(Charset) 250 ) 251 -> format(atom(ContentType), '~w; charset=~w', [MediaType, Charset]) 252 ; format(atom(ContentType), '~w', [MediaType]) 253 ).
262default_charset(Charset) :- 263 current_prolog_flag(default_charset, Charset), 264 Charset \== (-). 265 266set_default_charset :- 267 current_prolog_flag(default_charset, _), 268 !. 269set_default_charset :- 270 current_prolog_flag(encoding, utf8), 271 !, 272 set_prolog_flag(default_charset, 'UTF-8'). 273set_default_charset. 274 275:- initialization(set_default_charset).
Determine mime-type for a file
Simple library to guess the mime-type from the extension of a file. As various applications need to do this type ofinferencing it seems worthwhile to place this functionality in an extensible library.