# TargetConfiguration.java

    /**
     *  Copyright (c) 2009, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
     *
     *  Licensed 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.synapse.transport.passthru.config;

    import org.apache.axis2.AxisFault;
    import org.apache.axis2.context.ConfigurationContext;
    import org.apache.axis2.description.ParameterInclude;
    import org.apache.axis2.transport.base.threads.WorkerPool;
    import org.apache.http.HttpRequestInterceptor;
    import org.apache.http.impl.nio.reactor.IOReactorConfig;
    import org.apache.http.params.HttpParams;
    import org.apache.http.protocol.HTTP;
    import org.apache.http.protocol.HttpProcessor;
    import org.apache.http.protocol.ImmutableHttpProcessor;
    import org.apache.http.protocol.RequestConnControl;
    import org.apache.http.protocol.RequestContent;
    import org.apache.http.protocol.RequestExpectContinue;
    import org.apache.http.protocol.RequestTargetHost;
    import org.apache.http.protocol.RequestUserAgent;
    import org.apache.synapse.transport.http.conn.ProxyAuthenticator;
    import org.apache.synapse.transport.passthru.connections.TargetConnections;
    import org.apache.synapse.transport.passthru.jmx.PassThroughTransportMetricsCollector;

    import java.util.ArrayList;
    import java.util.Arrays;
    import java.util.List;

    /**
     * This class stores configuration specific to HTTP Connectors (Senders)
     */
    public class TargetConfiguration extends BaseConfiguration {

        private HttpProcessor httpProcessor = null;

        private ProxyAuthenticator proxyAuthenticator = null;

        private int maxConnections = Integer.MAX_VALUE;

        /** Weather User-Agent header coming from client should be preserved */
        private boolean preserveUserAgentHeader = false;
        /** Weather Server header coming from server should be preserved */
        private boolean preserveServerHeader = true;
        /** Http headers which should be preserved */
        private List<String> preserveHttpHeaders;

        private TargetConnections connections = null;

        public TargetConfiguration(ConfigurationContext configurationContext,
                                   ParameterInclude parameters,
                                   WorkerPool pool,
                                   PassThroughTransportMetricsCollector metrics,
                                   ProxyAuthenticator proxyAuthenticator) {
            super(configurationContext, parameters, pool, metrics);

            httpProcessor = new ImmutableHttpProcessor(
                    new HttpRequestInterceptor[] {
                            new RequestContent(),
                            new RequestTargetHost(),
                            new RequestConnControl(),
                            new RequestUserAgent(),
                            new RequestExpectContinue()
             });
            this.proxyAuthenticator = proxyAuthenticator;
        }

        public void build() throws AxisFault {
            super.build();

            maxConnections = conf.getIntProperty(PassThroughConfigPNames.MAX_CONNECTION_PER_HOST_PORT,
                    Integer.MAX_VALUE);
            preserveUserAgentHeader = conf.isPreserveUserAgentHeader();
            preserveServerHeader = conf.isPreserveServerHeader();
            populatePreserveHttpHeaders(conf.getPreserveHttpHeaders());
        }

        public HttpParams getHttpParams() {
            return httpParams;
        }

        public IOReactorConfig getIOReactorConfig() {
            return ioReactorConfig;
        }

        public HttpProcessor getHttpProcessor() {
            return httpProcessor;
        }

        public ProxyAuthenticator getProxyAuthenticator() {
            return proxyAuthenticator;
        }

        public int getMaxConnections() {
            return maxConnections;
        }

        public TargetConnections getConnections() {
            return connections;
        }

        public void setConnections(TargetConnections connections) {
            this.connections = connections;
        }

        /**
         * Check preserving status of the given http header name
         *
         * @param headerName http header name which need to check preserving status
         * @return preserving status of the given http header
         */
        public boolean isPreserveHttpHeader(String headerName) {

            if (preserveHttpHeaders == null || preserveHttpHeaders.isEmpty() || headerName == null) {
                return false;
            }
            return preserveHttpHeaders.contains(headerName.toUpperCase());
        }

        public List<String> getPreserveHttpHeaders() {
            return preserveHttpHeaders;
        }

        /**
         * Populate preserve http headers from comma separate string
         *
         * @param preserveHeaders Comma separated preserve enable http headers
         */
        private void populatePreserveHttpHeaders(String preserveHeaders) {

            preserveHttpHeaders = new ArrayList<String>();
            if (preserveHeaders != null && !preserveHeaders.isEmpty()) {
                String[] presHeaders = preserveHeaders.trim().toUpperCase().split(",");
                if (presHeaders != null && presHeaders.length > 0) {
                    preserveHttpHeaders.addAll(Arrays.asList(presHeaders));
                }
            }

            if (preserveServerHeader && !preserveHttpHeaders.contains(HTTP.SERVER_HEADER.toUpperCase())) {
                preserveHttpHeaders.add(HTTP.SERVER_HEADER.toUpperCase());
            }

            if (preserveUserAgentHeader && !preserveHttpHeaders.contains(HTTP.USER_AGENT.toUpperCase())) {
                preserveHttpHeaders.add(HTTP.USER_AGENT.toUpperCase());
            }
        }

    }