| /* |
| * 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.pig.validator; |
| |
| import java.util.Set; |
| |
| import org.apache.pig.PigConfiguration; |
| import org.apache.pig.PigServer; |
| import org.apache.pig.impl.PigContext; |
| import org.apache.pig.impl.logicalLayer.FrontendException; |
| import com.google.common.base.Splitter; |
| import com.google.common.collect.Sets; |
| |
| /** |
| * |
| * This Filter handles black and whitelisting of Pig commands. |
| */ |
| public final class BlackAndWhitelistFilter implements PigCommandFilter { |
| private static final int BLACKANDWHITELIST_ERROR_CODE = 1856; |
| private static final Splitter SPLITTER = Splitter.on(',').trimResults() |
| .omitEmptyStrings(); |
| |
| private final PigContext context; |
| private final Set<String> whitelist; |
| private final Set<String> blacklist; |
| |
| public BlackAndWhitelistFilter(PigServer pigServer) { |
| this(pigServer.getPigContext()); |
| } |
| |
| public BlackAndWhitelistFilter(PigContext context) { |
| this.context = context; |
| |
| whitelist = Sets.newHashSet(); |
| blacklist = Sets.newHashSet(); |
| |
| init(); |
| } |
| |
| private void init() { |
| String whitelistConfig = context.getProperties().getProperty(PigConfiguration.PIG_WHITELIST); |
| |
| if (whitelistConfig != null) { |
| Iterable<String> iter = SPLITTER.split(whitelistConfig); |
| for (String elem : iter) { |
| whitelist.add(elem.toUpperCase()); |
| } |
| } |
| |
| String blacklistConfig = context.getProperties().getProperty(PigConfiguration.PIG_BLACKLIST); |
| if (blacklistConfig != null) { |
| Iterable<String> iter = SPLITTER.split(blacklistConfig); |
| for(String elem : iter) { |
| String uElem = elem.toUpperCase(); |
| if(whitelist.contains(uElem)) { |
| throw new IllegalStateException("Conflict between whitelist and blacklist. '"+elem+"' appears in both."); |
| } |
| blacklist.add(uElem); |
| } |
| } |
| } |
| |
| @Override |
| public void validate(Command command) throws FrontendException { |
| if (blacklist.contains(command.name())) { |
| throw new FrontendException(command.name() + " command is not permitted. ", BLACKANDWHITELIST_ERROR_CODE); |
| } |
| |
| // check for size of whitelist as an empty whitelist should not disallow using Pig commands altogether. |
| if (whitelist.size() > 0 && !whitelist.contains(command.name())) { |
| throw new FrontendException(command.name() + " command is not permitted. ", BLACKANDWHITELIST_ERROR_CODE); |
| } |
| } |
| |
| } |