rdf_sandbox.pl

/*  Part of SWI-Prolog

    Author:        Jan Wielemaker
    E-mail:        J.Wielemaker@vu.nl
    WWW:           http://www.swi-prolog.org
    Copyright (c)  2016, VU University Amsterdam
    All rights reserved.

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       notice, this list of conditions and the following disclaimer.

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    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/

:- module(rdf_sandbox, []).

/** <module> Declare RDF API sandbox-safe

This   module   provides   clauses   for     the   multifile   predicate
sandbox:safe_primitive/1  defined  in  library(sandbox)  that  make  all
predicates of the RDF API that have   no permanent side effects safe. To
have an affect, this  module  must  be   *loaded  after  the  modules it
declares safe*. Thus, when using the   sequence  below, `rdf11` is safe,
while `sparql_client` is not (unless   sparql_client  was already loaded
before this sequence).

  ```
  :- use_module(library(semweb/rdf11)).         % safe
  :- use_module(library(semweb/rdf_sandbox)).
  :- use_module(library(semweb/sparql_client)). % Not safe
  ```

Normally, sandbox declarations live in  the   module  in  which the safe
predicates are defined, so we are sure  we are making declarations about
this specific version of a predicate. For   RDF we decoupled the sandbox
declarations  from  the  implementation  because    although   rdf/3  is
technically safe to use (calling it has   no side effects), it may _make
information accessible_ that is not supposed to be.

Loading this library makes all   side-effect-free  predicates considered
safe. If some of your RDF needs to  remain hidden, you should *not* load
this file and instead use your own   version that project your data. The
example below defines a wrapper around   rdf/4 that provides safe access
to certain graphs.

``` :- module(rdf_api,
          [ rdf/4
          ]).
:- use_module(library(semweb/rdf11)).

:- rdf_meta rdf(r,r,o,r).

rdf(S,P,O,G) :-
        public_graph(G), !,
        rdf11:rdf(S,P,O,G).
rdf(S,P,O,G) :-
        permission_error(access, graph, G).

:- multifile sandbox:safe_primitive/1.

sandbox:safe_primitive(rdf_api:rdf(_,_,_,_)).
*/

:- multifile
    sandbox:safe_primitive/1,
    sandbox:safe_meta_predicate/1.


                 /*******************************
                 *             RDF_DB           *
                 *******************************/

:- if(current_predicate(rdf_db:rdf/3)).
sandbox:safe_primitive(rdf_db:rdf(_,_,_)).
sandbox:safe_primitive(rdf_db:rdf(_,_,_,_)).
sandbox:safe_primitive(rdf_db:rdf_has(_,_,_)).
sandbox:safe_primitive(rdf_db:rdf_has(_,_,_,_)).
sandbox:safe_primitive(rdf_db:rdf_reachable(_,_,_)).
sandbox:safe_primitive(rdf_db:rdf_reachable(_,_,_,_,_)).
sandbox:safe_primitive(rdf_db:rdf_resource(_)).
sandbox:safe_primitive(rdf_db:rdf_subject(_)).
sandbox:safe_primitive(rdf_db:rdf_predicate_property(_,_)).
sandbox:safe_primitive(rdf_db:rdf_current_predicate(_)).
sandbox:safe_primitive(rdf_db:rdf_current_literal(_)).
sandbox:safe_primitive(rdf_db:rdf_graph(_)).
sandbox:safe_primitive(rdf_db:rdf_generation(_)).
sandbox:safe_primitive(rdf_db:rdf_estimate_complexity(_,_,_,_)).
sandbox:safe_primitive(rdf_db:rdf_statistics(_)).
sandbox:safe_primitive(rdf_db:lang_matches(_,_)).
sandbox:safe_primitive(rdf_db:lang_equal(_,_)).
sandbox:safe_primitive(rdf_db:rdf_version(_)).
sandbox:safe_primitive(rdf_db:rdf_md5(_,_)).
sandbox:safe_primitive(rdf_db:rdf_graph_modified_(_,_,_)).
sandbox:safe_primitive(rdf_db:rdf_graph_source_(_,_,_)).
sandbox:safe_primitive(rdf_db:rdf_graph_(_,_)).
sandbox:safe_primitive(rdf_db:rdf_find_literal_map(_,_,_)).
sandbox:safe_primitive(rdf_db:rdf_keys_in_literal_map(_,_,_)).
sandbox:safe_primitive(rdf_db:rdf_statistics_literal_map(_,_)).

sandbox:safe_meta_predicate(rdf_prefixes:rdf_current_prefix/2).
sandbox:safe_meta_predicate(rdf_prefixes:rdf_global_id/2).
:- endif.


                 /*******************************
                 *            RDF11             *
                 *******************************/

:- if(current_predicate(rdf11:in_xml_literal/3)).
sandbox:safe_primitive(rdf11:in_xml_literal(_,_,_)).
sandbox:safe_primitive(rdf11:pre_object(_,_,_,_)).
sandbox:safe_primitive(rdf11:post_object(_,_)).
sandbox:safe_primitive(rdf11:rdf_where(_)).
:- endif.


                 /*******************************
                 *         RDF-LITINDEX         *
                 *******************************/

:- if(current_predicate(rdf_litindex:rdf_find_literals/2)).
sandbox:safe_primitive(rdf_litindex:rdf_find_literals(_,_)).
sandbox:safe_primitive(rdf_litindex:rdf_tokenize_literal(_,_)).
sandbox:safe_primitive(rdf_litindex:rdf_literal_index(_,_)).
:- endif.

                 /*******************************
                 *         SPARQL-CLIENT        *
                 *******************************/

:- if(current_predicate(sparql_client:sparql_query/3)).
sandbox:safe_primitive(sparql_client:sparql_query(_,_,_)).
:- endif.