| /* |
| * 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. |
| */ |
| package org.apache.rya.mongodb.document.operators.aggregation; |
| |
| import static org.apache.rya.mongodb.document.operators.aggregation.PipelineOperators.redact; |
| import static org.apache.rya.mongodb.document.operators.aggregation.SetOperators.anyElementTrue; |
| import static org.apache.rya.mongodb.document.operators.aggregation.SetOperators.setIsSubsetNullSafe; |
| import static org.apache.rya.mongodb.document.operators.aggregation.VariableOperators.map; |
| import static org.apache.rya.mongodb.document.operators.query.ArrayOperators.size; |
| import static org.apache.rya.mongodb.document.operators.query.ComparisonOperators.eq; |
| import static org.apache.rya.mongodb.document.operators.query.LogicalOperators.or; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.accumulo.core.security.Authorizations; |
| import org.apache.rya.mongodb.MongoDbRdfConstants; |
| import org.apache.rya.mongodb.dao.SimpleMongoDBStorageStrategy; |
| import org.apache.rya.mongodb.document.operators.aggregation.PipelineOperators.RedactAggregationResult; |
| import org.apache.rya.mongodb.document.util.AuthorizationsUtil; |
| import org.bson.Document; |
| |
| import com.google.common.collect.Lists; |
| |
| /** |
| * Utility methods for MongoDB aggregation. |
| */ |
| public final class AggregationUtil { |
| /** |
| * Private constructor to prevent instantiation. |
| */ |
| private AggregationUtil() { |
| } |
| |
| /** |
| * Creates a MongoDB $redact aggregation pipeline that only include |
| * documents whose document visibility match the provided authorizations. |
| * All other documents are excluded. |
| * @param authorizations the {@link Authorization}s to include in the |
| * $redact. Only documents that match the authorizations will be returned. |
| * @return the {@link List} of {@link Document}s that represents the $redact |
| * aggregation pipeline. |
| */ |
| public static List<Document> createRedactPipeline(final Authorizations authorizations) { |
| if (MongoDbRdfConstants.ALL_AUTHORIZATIONS.equals(authorizations)) { |
| return Lists.newArrayList(); |
| } |
| |
| final List<String> authList = AuthorizationsUtil.getAuthorizationsStrings(authorizations); |
| |
| final String documentVisibilityField = "$" + SimpleMongoDBStorageStrategy.DOCUMENT_VISIBILITY; |
| |
| final String mapVariableCursorName = "dvItemCursorTag"; |
| |
| final Document anyElementTrue = |
| anyElementTrue( |
| map( |
| documentVisibilityField, |
| mapVariableCursorName, |
| setIsSubsetNullSafe( |
| "$$" + mapVariableCursorName, |
| authList |
| ) |
| ) |
| ); |
| |
| // If the field is empty then there are no authorizations required, |
| // so all users should be able to view it when they query. |
| final Document isFieldSizeZero = |
| eq( |
| size(documentVisibilityField), |
| 0 |
| ); |
| |
| final Document orExpression = or(anyElementTrue, isFieldSizeZero); |
| |
| final List<Document> pipeline = new ArrayList<>(); |
| pipeline.add( |
| redact( |
| orExpression, |
| RedactAggregationResult.DESCEND, |
| RedactAggregationResult.PRUNE |
| ) |
| ); |
| |
| return pipeline; |
| } |
| } |