| /* |
| * 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.knox.gateway.svcregfunc.impl; |
| |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteEnvironment; |
| import org.apache.knox.gateway.filter.rewrite.spi.UrlRewriteContext; |
| import org.apache.knox.gateway.filter.rewrite.spi.UrlRewriteFunctionProcessor; |
| import org.apache.knox.gateway.services.ServiceType; |
| import org.apache.knox.gateway.services.hostmap.HostMapper; |
| import org.apache.knox.gateway.services.hostmap.HostMapperService; |
| import org.apache.knox.gateway.svcregfunc.api.ServiceMappedAddressFunctionDescriptor; |
| import org.apache.knox.gateway.util.urltemplate.Host; |
| import org.apache.knox.gateway.util.urltemplate.Parser; |
| import org.apache.knox.gateway.util.urltemplate.Port; |
| import org.apache.knox.gateway.util.urltemplate.Template; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriter; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class ServiceMappedAddressFunctionProcessor |
| extends ServiceRegistryFunctionProcessorBase<ServiceMappedAddressFunctionDescriptor> |
| implements UrlRewriteFunctionProcessor<ServiceMappedAddressFunctionDescriptor> { |
| |
| private HostMapper hostmap; |
| |
| @Override |
| public String name() { |
| return ServiceMappedAddressFunctionDescriptor.FUNCTION_NAME; |
| } |
| |
| @Override |
| public void initialize( UrlRewriteEnvironment environment, ServiceMappedAddressFunctionDescriptor descriptor ) throws Exception { |
| super.initialize( environment, descriptor ); |
| HostMapperService hostmapService = services().getService( ServiceType.HOST_MAPPING_SERVICE ); |
| if( hostmapService != null ) { |
| hostmap = hostmapService.getHostMapper( cluster() ); |
| } |
| } |
| |
| @Override |
| public List<String> resolve( UrlRewriteContext context, List<String> parameters ) throws Exception { |
| List<String> results = null; |
| if( parameters != null ) { |
| UrlRewriter.Direction direction = context.getDirection(); |
| results = new ArrayList<>( parameters.size() ); |
| for( String parameter : parameters ) { |
| parameter = resolve( direction, parameter ); |
| results.add( parameter ); |
| } |
| } |
| return results; |
| } |
| |
| public String resolve( UrlRewriter.Direction direction, String parameter ) throws Exception { |
| String addr = parameter; |
| String url = lookupServiceUrl( parameter ); |
| if( url != null ) { |
| Template template = Parser.parseLiteral( url ); |
| Host host = template.getHost(); |
| String hostStr = null; |
| if( host != null ) { |
| hostStr = host.getFirstValue().getPattern(); |
| if( hostmap != null ) { |
| switch( direction ) { |
| case IN: |
| hostStr = hostmap.resolveInboundHostName( hostStr ); |
| break; |
| case OUT: |
| hostStr = hostmap.resolveOutboundHostName( hostStr ); |
| break; |
| } |
| } |
| } |
| |
| Port port = template.getPort(); |
| String portStr = null; |
| if( port != null ) { |
| portStr = port.getFirstValue().getPattern(); |
| } |
| |
| if( hostStr != null && portStr != null ) { |
| addr = hostStr + ":" + portStr; |
| } else if( host != null && port == null ) { |
| addr = hostStr; |
| } else if( host == null && port != null ) { |
| addr = ":" + portStr; |
| } |
| } |
| return addr; |
| } |
| |
| } |
| |