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/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@vu.nl
WWW: http://www.swi-prolog.org
Copyright (c) 2009-2014, VU University, Amsterdam
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
:- module(http_server_files,
[ serve_files_in_directory/2 % +Alias, +HTTPRequest
]).
:- use_module(library(http/http_path)).
:- use_module(library(http/http_dispatch)).
/** <module> Serve files needed by modules from the server
This module provides an infrastructure for serving resource-files such
as icons, JavaScript, CSS files, etc. The default configuration serves
the HTTP locations =icons=, =css= and =js= (see
http_absolute_location/3)
The location for these services can be changed by adding rules for
http:location/3. Directories providing additional or alternative
resources can be achieved by adding rules for user:file_search_path/2.
*/
:- multifile
http:location/3. % Alias, Expansion, Options
:- dynamic
http:location/3. % Alias, Expansion, Options
http:location(icons, root(icons), [ priority(-100) ]).
http:location(css, root(css), [ priority(-100) ]).
http:location(js, root(js), [ priority(-100) ]).
:- multifile
user:file_search_path/2.
:- dynamic
user:file_search_path/2.
user:file_search_path(icons, library('http/web/icons')).
user:file_search_path(css, library('http/web/css')).
user:file_search_path(js, library('http/web/js')).
:- http_handler(icons(.), serve_files_in_directory(icons),
[prefix, priority(-100)]).
:- http_handler(css(.), serve_files_in_directory(css),
[prefix, priority(-100)]).
:- http_handler(js(.), serve_files_in_directory(js),
[prefix, priority(-100)]).
%! serve_files_in_directory(+Alias, +Request)
%
% Serve files from the directory Alias from the path-info from
% Request. This predicate is used together with
% file_search_path/2. Note that multiple clauses for the same
% file_search_path alias can be used to merge files from different
% physical locations onto the same HTTP directory. Note that the
% handler must be declared as =prefix=. Below is an example
% serving images from http://<host>/img/... from the directory
% =http/web/icons=.
%
% ==
% http:location(img, root(img), []).
% user:file_search_path(icons, library('http/web/icons')).
%
% :- http_handler(img(.), serve_files_in_directory(icons), [prefix]).
% ==
%
% This predicate calls http_404/2 if the physical file cannot be
% located. If the requested path-name is unsafe (i.e., points
% outside the hierarchy defines by the file_search_path/2
% declaration), this handlers returns a _403 Forbidden_ page.
%
% @see http_reply_file/3
serve_files_in_directory(Alias, Request) :-
memberchk(path_info(PathInfo), Request),
!,
Term =.. [Alias,PathInfo],
( catch(http_safe_file(Term, []),
error(permission_error(read, file, _), _),
fail)
-> ( absolute_file_name(Term, Path,
[ access(read),
file_errors(fail)
])
-> http_reply_file(Path,
[ unsafe(true),
static_gzip(true)
], Request)
; http_404([], Request)
)
; memberchk(path(Path), Request),
throw(http_reply(forbidden(Path)))
).
serve_files_in_directory(_Alias, Request) :-
memberchk(path(Path), Request),
throw(http_reply(forbidden(Path))).
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