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) 2016, VU University Amsterdam 7 All rights reserved. 8 9 Redistribution and use in source and binary forms, with or without 10 modification, are permitted provided that the following conditions 11 are met: 12 13 1. Redistributions of source code must retain the above copyright 14 notice, this list of conditions and the following disclaimer. 15 16 2. Redistributions in binary form must reproduce the above copyright 17 notice, this list of conditions and the following disclaimer in 18 the documentation and/or other materials provided with the 19 distribution. 20 21 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 29 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 31 ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 POSSIBILITY OF SUCH DAMAGE. 33*/ 34 35:- module(rdf_sandbox, []). 36 37/** <module> Declare RDF API sandbox-safe 38 39This module provides clauses for the multifile predicate 40sandbox:safe_primitive/1 defined in library(sandbox) that make all 41predicates of the RDF API that have no permanent side effects safe. To 42have an affect, this module must be *loaded after the modules it 43declares safe*. Thus, when using the sequence below, `rdf11` is safe, 44while `sparql_client` is not (unless sparql_client was already loaded 45before this sequence). 46 47 ``` 48 :- use_module(library(semweb/rdf11)). % safe 49 :- use_module(library(semweb/rdf_sandbox)). 50 :- use_module(library(semweb/sparql_client)). % Not safe 51 ``` 52 53Normally, sandbox declarations live in the module in which the safe 54predicates are defined, so we are sure we are making declarations about 55this specific version of a predicate. For RDF we decoupled the sandbox 56declarations from the implementation because although rdf/3 is 57technically safe to use (calling it has no side effects), it may _make 58information accessible_ that is not supposed to be. 59 60Loading this library makes all side-effect-free predicates considered 61safe. If some of your RDF needs to remain hidden, you should *not* load 62this file and instead use your own version that project your data. The 63example below defines a wrapper around rdf/4 that provides safe access 64to certain graphs. 65 66``` :- module(rdf_api, 67 [ rdf/4 68 ]). 69:- use_module(library(semweb/rdf11)). 70 71:- rdf_meta rdf(r,r,o,r). 72 73rdf(S,P,O,G) :- 74 public_graph(G), !, 75 rdf11:rdf(S,P,O,G). 76rdf(S,P,O,G) :- 77 permission_error(access, graph, G). 78 79:- multifile sandbox:safe_primitive/1. 80 81sandbox:safe_primitive(rdf_api:rdf(_,_,_,_)). 82*/ 83 84:- multifile 85 sandbox:safe_primitive/1, 86 sandbox:safe_meta_predicate/1. 87 88 89 /******************************* 90 * RDF_DB * 91 *******************************/ 92 93:- if(current_predicate(rdf_db:rdf/3)). 94sandbox:safe_primitive(rdf_db:rdf(_,_,_)). 95sandbox:safe_primitive(rdf_db:rdf(_,_,_,_)). 96sandbox:safe_primitive(rdf_db:rdf_has(_,_,_)). 97sandbox:safe_primitive(rdf_db:rdf_has(_,_,_,_)). 98sandbox:safe_primitive(rdf_db:rdf_reachable(_,_,_)). 99sandbox:safe_primitive(rdf_db:rdf_reachable(_,_,_,_,_)). 100sandbox:safe_primitive(rdf_db:rdf_resource(_)). 101sandbox:safe_primitive(rdf_db:rdf_subject(_)). 102sandbox:safe_primitive(rdf_db:rdf_predicate_property(_,_)). 103sandbox:safe_primitive(rdf_db:rdf_current_predicate(_)). 104sandbox:safe_primitive(rdf_db:rdf_current_literal(_)). 105sandbox:safe_primitive(rdf_db:rdf_graph(_)). 106sandbox:safe_primitive(rdf_db:rdf_generation(_)). 107sandbox:safe_primitive(rdf_db:rdf_estimate_complexity(_,_,_,_)). 108sandbox:safe_primitive(rdf_db:rdf_statistics(_)). 109sandbox:safe_primitive(rdf_db:lang_matches(_,_)). 110sandbox:safe_primitive(rdf_db:lang_equal(_,_)). 111sandbox:safe_primitive(rdf_db:rdf_version(_)). 112sandbox:safe_primitive(rdf_db:rdf_md5(_,_)). 113sandbox:safe_primitive(rdf_db:rdf_graph_modified_(_,_,_)). 114sandbox:safe_primitive(rdf_db:rdf_graph_source_(_,_,_)). 115sandbox:safe_primitive(rdf_db:rdf_graph_(_,_)). 116sandbox:safe_primitive(rdf_db:rdf_find_literal_map(_,_,_)). 117sandbox:safe_primitive(rdf_db:rdf_keys_in_literal_map(_,_,_)). 118sandbox:safe_primitive(rdf_db:rdf_statistics_literal_map(_,_)). 119 120sandbox:safe_meta_predicate(rdf_db:rdf_current_prefix/2). 121sandbox:safe_meta_predicate(rdf_db:rdf_global_id/2). 122:- endif. 123 124 125 /******************************* 126 * RDF11 * 127 *******************************/ 128 129:- if(current_predicate(rdf11:in_xml_literal/3)). 130sandbox:safe_primitive(rdf11:in_xml_literal(_,_,_)). 131sandbox:safe_primitive(rdf11:pre_object(_,_)). 132sandbox:safe_primitive(rdf11:post_object(_,_)). 133:- endif. 134 135 136 /******************************* 137 * RDF-LITINDEX * 138 *******************************/ 139 140:- if(current_predicate(rdf_litindex:rdf_find_literals/2)). 141sandbox:safe_primitive(rdf_litindex:rdf_find_literals(_,_)). 142sandbox:safe_primitive(rdf_litindex:rdf_tokenize_literal(_,_)). 143sandbox:safe_primitive(rdf_litindex:rdf_literal_index(_,_)). 144:- endif. 145 146 /******************************* 147 * SPARQL-CLIENT * 148 *******************************/ 149 150:- if(current_predicate(sparql_client:sparql_query/3)). 151sandbox:safe_primitive(sparql_client:sparql_query(_,_,_)). 152:- endif.