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jena-fuseki-access - Dynamic Graph selection at query time
- "#pragma acl.graphs" preamble can be used to specify one or more graphs to restriction query exectution to - The functionality is only enabled if an access:entry for a specific user contains just <urn:jena:accessGraphsDynamic> - Requires context propagation patch (see apache#1291), since query is stored in request-specific context
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...ena-fuseki-access/src/main/java/org/apache/jena/fuseki/access/SecurityContextDynamic.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| package org.apache.jena.fuseki.access; | ||
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| import java.util.Collection; | ||
| import java.util.Collections; | ||
| import java.util.function.Predicate; | ||
| import java.util.regex.Matcher; | ||
| import java.util.regex.Pattern; | ||
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| import org.apache.jena.graph.Node; | ||
| import org.apache.jena.graph.NodeFactory; | ||
| import org.apache.jena.query.QueryExecution; | ||
| import org.apache.jena.sparql.core.DatasetGraph; | ||
| import org.apache.jena.sparql.core.Quad; | ||
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| /** A {@link SecurityContext} that provides no access itself but indicates that the set of visible graphs should be | ||
| * constructed from a set embedded in the query. Use {@link SecurityContextDynamic#instantiateFromQuery} to create the | ||
| * query-specific set of graphs to filter. | ||
| * This context is not meant to be used directly by end users: The initial query has a list of visible graphs prepended | ||
| * before execution based on use-case specific criteria, with the following format: | ||
| * | ||
| * #pragma acl.graphs <graph1>|<graph2>|..|<graphN> | ||
| * | ||
| */ | ||
| public class SecurityContextDynamic implements SecurityContext { | ||
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| public static final Node dynamicAccess = NodeFactory.createURI("urn:jena:accessGraphsDynamic"); | ||
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| private static final Pattern GRAPH_PRAGMA_DELIMITER_PATTERN = Pattern.compile("\\|"); | ||
| private static final String GRAPH_PRAGMA_PATTERN_GROUP = "graphs"; | ||
| private static final Pattern GRAPH_PRAGMA_PATTERN = Pattern.compile( | ||
| "^" + | ||
| // Leading whitespace | ||
| "\\s*" + | ||
| // For simplicity, expect pragma on first non-whitespace line | ||
| "#pragma acl\\.graphs\\h+(?<" + GRAPH_PRAGMA_PATTERN_GROUP + ">\\S*)\\h*\\v" + | ||
| // Anything else | ||
| ".*", | ||
| Pattern.DOTALL | ||
| ); | ||
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| public SecurityContextDynamic() {} | ||
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| @Override | ||
| public Collection<Node> visibleGraphs() { | ||
| return Collections.emptyList(); | ||
| } | ||
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| @Override | ||
| public boolean visableDefaultGraph() { return false; } | ||
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| @Override | ||
| public Predicate<Quad> predicateQuad() { return q -> false; } | ||
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| @Override | ||
| public void filterTDB(DatasetGraph dsg, QueryExecution qExec) { | ||
| Predicate<?> pred = tuple->false; | ||
| qExec.getContext().set(GraphFilter.getContextKey(dsg), pred); | ||
| } | ||
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| public SecurityContext instantiateFromQuery(String queryString) { | ||
| if ( queryString != null ) { | ||
| Matcher m = GRAPH_PRAGMA_PATTERN.matcher(queryString); | ||
| if ( m.matches() ) { | ||
| String[] graphs = GRAPH_PRAGMA_DELIMITER_PATTERN | ||
| .splitAsStream(m.group(GRAPH_PRAGMA_PATTERN_GROUP)) | ||
| .map(String::trim) | ||
| .toArray(String[]::new); | ||
| return new SecurityContextView(graphs); | ||
| } | ||
| } | ||
| return new SecurityContextAllowNone(); | ||
| } | ||
| } |