| /* |
| * |
| * 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.qpid.server.exchange; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.qpid.server.filter.AMQInvalidArgumentException; |
| import org.apache.qpid.server.filter.FilterManager; |
| import org.apache.qpid.server.filter.FilterSupport; |
| import org.apache.qpid.server.filter.Filterable; |
| import org.apache.qpid.server.filter.MessageFilter; |
| import org.apache.qpid.server.message.AMQMessageHeader; |
| import org.apache.qpid.server.model.Binding; |
| |
| /** |
| * Defines binding and matching based on a set of headers. |
| */ |
| class HeadersBinding |
| { |
| private static final Logger LOGGER = LoggerFactory.getLogger(HeadersBinding.class); |
| |
| private final Map<String,Object> _mappings; |
| private final AbstractExchange.BindingIdentifier _binding; |
| private final Set<String> required = new HashSet<>(); |
| private final Map<String,Object> matches = new HashMap<>(); |
| private final String _replacementRoutingKey; |
| private boolean matchAny; |
| private FilterManager _filter; |
| |
| /** |
| * Creates a header binding for a set of mappings. Those mappings whose value is |
| * null or the empty string are assumed only to be required headers, with |
| * no constraint on the value. Those with a non-null value are assumed to |
| * define a required match of value. |
| * |
| * @param binding the binding to create a header binding using |
| */ |
| public HeadersBinding(AbstractExchange.BindingIdentifier binding, Map<String,Object> arguments) |
| throws AMQInvalidArgumentException |
| { |
| _binding = binding; |
| arguments = arguments == null ? Collections.emptyMap() : arguments; |
| if(_binding != null) |
| { |
| _mappings = arguments; |
| initMappings(); |
| } |
| else |
| { |
| _mappings = null; |
| } |
| Object key = arguments.get(Binding.BINDING_ARGUMENT_REPLACEMENT_ROUTING_KEY); |
| _replacementRoutingKey = key == null ? null : String.valueOf(key); |
| } |
| |
| private void initMappings() throws AMQInvalidArgumentException |
| { |
| if(FilterSupport.argumentsContainFilter(_mappings)) |
| { |
| _filter = FilterSupport.createMessageFilter(_mappings, _binding.getDestination()); |
| } |
| for(Map.Entry<String, Object> entry : _mappings.entrySet()) |
| { |
| String propertyName = entry.getKey(); |
| Object value = entry.getValue(); |
| if (isSpecial(propertyName)) |
| { |
| processSpecial(propertyName, value); |
| } |
| else if (value == null || value.equals("")) |
| { |
| required.add(propertyName); |
| } |
| else |
| { |
| matches.put(propertyName,value); |
| } |
| } |
| } |
| |
| public AbstractExchange.BindingIdentifier getBinding() |
| { |
| return _binding; |
| } |
| |
| /** |
| * Checks whether the supplied headers match the requirements of this binding |
| * @param headers the headers to check |
| * @return true if the headers define any required keys and match any required |
| * values |
| */ |
| public boolean matches(AMQMessageHeader headers) |
| { |
| if(headers == null) |
| { |
| return required.isEmpty() && matches.isEmpty(); |
| } |
| else |
| { |
| return matchAny ? or(headers) : and(headers); |
| } |
| } |
| |
| public boolean matches(Filterable message) |
| { |
| return matches(message.getMessageHeader()) && (_filter == null || _filter.allAllow(message)); |
| } |
| |
| private boolean and(AMQMessageHeader headers) |
| { |
| if(headers.containsHeaders(required)) |
| { |
| for(Map.Entry<String, Object> e : matches.entrySet()) |
| { |
| if(!e.getValue().equals(headers.getHeader(e.getKey()))) |
| { |
| return false; |
| } |
| } |
| return true; |
| } |
| else |
| { |
| return false; |
| } |
| } |
| |
| |
| private boolean or(final AMQMessageHeader headers) |
| { |
| if(required.isEmpty()) |
| { |
| return matches.isEmpty() || passesMatchesOr(headers); |
| } |
| else |
| { |
| if(!passesRequiredOr(headers)) |
| { |
| return !matches.isEmpty() && passesMatchesOr(headers); |
| } |
| else |
| { |
| return true; |
| } |
| |
| } |
| } |
| |
| private boolean passesMatchesOr(AMQMessageHeader headers) |
| { |
| for(Map.Entry<String,Object> entry : matches.entrySet()) |
| { |
| if(headers.containsHeader(entry.getKey()) |
| && ((entry.getValue() == null && headers.getHeader(entry.getKey()) == null) |
| || (entry.getValue().equals(headers.getHeader(entry.getKey()))))) |
| { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private boolean passesRequiredOr(AMQMessageHeader headers) |
| { |
| for(String name : required) |
| { |
| if(headers.containsHeader(name)) |
| { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private void processSpecial(String key, Object value) |
| { |
| if("X-match".equalsIgnoreCase(key)) |
| { |
| matchAny = isAny(value); |
| } |
| else |
| { |
| LOGGER.warn("Ignoring special header: " + key); |
| } |
| } |
| |
| private boolean isAny(Object value) |
| { |
| if(value instanceof String) |
| { |
| if("any".equalsIgnoreCase((String) value)) |
| { |
| return true; |
| } |
| if("all".equalsIgnoreCase((String) value)) |
| { |
| return false; |
| } |
| } |
| LOGGER.warn("Ignoring unrecognised match type: " + value); |
| return false;//default to all |
| } |
| |
| static boolean isSpecial(Object key) |
| { |
| return key instanceof String && isSpecial((String) key); |
| } |
| |
| static boolean isSpecial(String key) |
| { |
| return key.startsWith("X-") || key.startsWith("x-"); |
| } |
| |
| @Override |
| public boolean equals(final Object o) |
| { |
| if (this == o) |
| { |
| return true; |
| } |
| |
| if (o == null || getClass() != o.getClass()) |
| { |
| return false; |
| } |
| |
| final HeadersBinding hb = (HeadersBinding) o; |
| |
| if(_binding == null) |
| { |
| if(hb.getBinding() != null) |
| { |
| return false; |
| } |
| } |
| else if (!_binding.equals(hb.getBinding())) |
| { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return _binding == null ? 0 : _binding.hashCode(); |
| } |
| |
| public String getReplacementRoutingKey() |
| { |
| return _replacementRoutingKey; |
| } |
| |
| private static class ExcludeAllFilter implements MessageFilter |
| { |
| @Override |
| public String getName() |
| { |
| return ""; |
| } |
| |
| @Override |
| public boolean startAtTail() |
| { |
| return false; |
| } |
| |
| @Override |
| public boolean matches(Filterable message) |
| { |
| return false; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "ExcludeAllFilter[]"; |
| } |
| } |
| } |