# SourceConfiguration.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 java.net.UnknownHostException;

    import org.apache.axis2.AxisFault;
    import org.apache.axis2.context.ConfigurationContext;
    import org.apache.axis2.description.Parameter;
    import org.apache.axis2.description.ParameterInclude;
    import org.apache.axis2.description.TransportInDescription;
    import org.apache.axis2.transport.TransportListener;
    import org.apache.axis2.transport.base.ParamUtils;
    import org.apache.axis2.transport.base.threads.WorkerPool;
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.http.HttpResponseFactory;
    import org.apache.http.HttpResponseInterceptor;
    import org.apache.http.impl.DefaultHttpResponseFactory;
    import org.apache.http.impl.nio.reactor.IOReactorConfig;
    import org.apache.http.params.HttpParams;
    import org.apache.http.protocol.HttpProcessor;
    import org.apache.http.protocol.ImmutableHttpProcessor;
    import org.apache.http.protocol.ResponseConnControl;
    import org.apache.http.protocol.ResponseContent;
    import org.apache.http.protocol.ResponseDate;
    import org.apache.http.protocol.ResponseServer;
    import org.apache.synapse.transport.http.conn.Scheme;
    import org.apache.synapse.transport.nhttp.NhttpConstants;
    import org.apache.synapse.transport.passthru.HttpGetRequestProcessor;
    import org.apache.synapse.transport.passthru.PassThroughConstants;
    import org.apache.synapse.transport.passthru.connections.SourceConnections;
    import org.apache.synapse.transport.passthru.jmx.PassThroughTransportMetricsCollector;

    /**
     * This class stores configurations specific to the Listeners
     */
    public class SourceConfiguration extends BaseConfiguration {

        private Log log = LogFactory.getLog(SourceConfiguration.class);

        /** This is used to process HTTP responses */
        private HttpProcessor httpProcessor = null;

        /** Response factory used for creating HTTP Responses */
        private HttpResponseFactory responseFactory = null;

        /** port of the listener */
        private int port = 8280;

        /** Object to manage the source connections */
        private SourceConnections sourceConnections = null;

        private TransportInDescription inDescription;
        private Scheme scheme;
        private String host;

        /** The EPR prefix for services available over this transport */
        private String serviceEPRPrefix;
        /** The EPR prefix for services with custom URI available over this transport */
        private String customEPRPrefix;

        /** WSDL processor for Get requests*/
        private HttpGetRequestProcessor httpGetRequestProcessor = null;

        public SourceConfiguration(ConfigurationContext configurationContext,
                                   TransportInDescription description,
                                   Scheme scheme,
                                   WorkerPool pool,
                                   PassThroughTransportMetricsCollector metrics) {
            super(configurationContext, description, pool, metrics);
            this.inDescription = description;
            this.scheme = scheme;
            httpProcessor = new ImmutableHttpProcessor(
                    new HttpResponseInterceptor[]{
                            new ResponseDate(),
                            new ResponseServer(),
                            new ResponseContent(),
                            new ResponseConnControl()});

            responseFactory = new DefaultHttpResponseFactory();

            sourceConnections = new SourceConnections();
        }

        public SourceConfiguration(WorkerPool pool,PassThroughTransportMetricsCollector metrics) {
            super(null, null, pool, metrics);
        }

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

            port = ParamUtils.getRequiredParamInt(parameters, "port");

            Parameter hostParameter = inDescription.getParameter(TransportListener.HOST_ADDRESS);
            if (hostParameter != null) {
                host = ((String) hostParameter.getValue()).trim();
            } else {
                try {
                    host = java.net.InetAddress.getLocalHost().getHostName();
                } catch (UnknownHostException e) {
                    log.warn("Unable to lookup local host name, using 'localhost'");
                }
            }

            Parameter param = inDescription.getParameter(PassThroughConstants.WSDL_EPR_PREFIX);
            if (param != null) {
                serviceEPRPrefix = getServiceEPRPrefix(configurationContext, (String) param.getValue());
                customEPRPrefix = (String) param.getValue();
            } else {
                serviceEPRPrefix = getServiceEPRPrefix(configurationContext, host, port);
                customEPRPrefix = scheme.getName() + "://" + host + ":" +
                        (port == scheme.getDefaultPort() ? "" : port) + "/";
            }

            // create http Get processor
            param = inDescription.getParameter(NhttpConstants.HTTP_GET_PROCESSOR);
            if (param != null && param.getValue() != null) {
                httpGetRequestProcessor = createHttpGetProcessor(param.getValue().toString());
                if (httpGetRequestProcessor == null) {
                    handleException("Cannot create HttpGetRequestProcessor");
                }
            }
            populatePreserveHttpHeaders(conf.getResponsePreseveHttpHeaders());
        }

        public HttpParams getHttpParams() {
            return httpParams;
        }

        public IOReactorConfig getIOReactorConfig() {
            return ioReactorConfig;
        }

        public HttpProcessor getHttpProcessor() {
            return httpProcessor;
        }

        public HttpResponseFactory getResponseFactory() {
            return responseFactory;
        }

        public String getHostname() {
            return host;
        }

        public int getPort() {
            return port;
        }

        public SourceConnections getSourceConnections() {
            return sourceConnections;
        }

        public TransportInDescription getInDescription() {
            return inDescription;
        }

        public Scheme getScheme() {
            return scheme;
        }

        public String getServiceEPRPrefix() {
            return serviceEPRPrefix;
        }

        public String getCustomEPRPrefix() {
            return customEPRPrefix;
        }

    	public HttpGetRequestProcessor getHttpGetRequestProcessor() {
    		return httpGetRequestProcessor;
    	}

    	/**
         * Return the EPR prefix for services made available over this transport
         * @param cfgCtx configuration context to retrieve the service context path
         * @param wsdlEPRPrefix specified wsdlPrefix
         *
         * @return wsdlEPRPrefix for the listener
         */
        protected String getServiceEPRPrefix(ConfigurationContext cfgCtx, String wsdlEPRPrefix) {
            return wsdlEPRPrefix +
                (!cfgCtx.getServiceContextPath().startsWith("/") ? "/" : "") +
                cfgCtx.getServiceContextPath() +
                (!cfgCtx.getServiceContextPath().endsWith("/") ? "/" : "");
        }

        /**
         * Return the EPR prefix for services made available over this transport
         * @param cfgCtx configuration context to retrieve the service context path
         * @param host name of the host
         * @param port listening port
         * @return wsdlEPRPrefix for the listener
         */
    	protected String getServiceEPRPrefix(ConfigurationContext cfgCtx,
    			String host, int port) {
            return scheme.getName() + "://"
                + host
                + (port == scheme.getDefaultPort() ? "" : ":" + port)
                + (!cfgCtx.getServiceContextPath().startsWith("/") ? "/" : "")
                + cfgCtx.getServiceContextPath()
                + (!cfgCtx.getServiceContextPath().endsWith("/") ? "/" : "");
    	}

        private HttpGetRequestProcessor createHttpGetProcessor(String str) throws AxisFault {
            Object obj = null;
            try {
                obj = Class.forName(str).newInstance();
            } catch (ClassNotFoundException e) {
                handleException("Error creating WSDL processor", e);
            } catch (InstantiationException e) {
                handleException("Error creating WSDL processor", e);
            } catch (IllegalAccessException e) {
                handleException("Error creating WSDL processor", e);
            }

            if (obj instanceof HttpGetRequestProcessor) {
                return (HttpGetRequestProcessor) obj;
            } else {
                handleException("Error creating WSDL processor. The HttpProcessor should be of type " +
                        "org.apache.synapse.transport.nhttp.HttpGetRequestProcessor");
            }

            return null;
        }

        private void handleException(String msg, Exception e) throws AxisFault {
            log.error(msg, e);
            throw new AxisFault(msg, e);
        }

        private void handleException(String msg) throws AxisFault {
            log.error(msg);
            throw new AxisFault(msg);
        }

        /**
         * return boolean value of the given property else return default value.
         * @param name Name of the Property
         * @param def Default value
         * @return
         */
        public boolean getBooleanValue(String name, boolean def) {
            String val = System.getProperty(name);
            if (val == null) {
                val =PassThroughConfiguration.getInstance().getStringProperty(name,String.valueOf(def));
            }
            if (val != null && Boolean.parseBoolean(val)) {
                if (log.isDebugEnabled()) {
                    log.debug("Using Passthru http tuning parameter : " + name);
                }
                return true;
            } else if (val != null && !Boolean.parseBoolean(val)) {
                if (log.isDebugEnabled()) {
                    log.debug("Using Passthru http tuning parameter : " + name);
                }
                return false;
            }
            return def;
        }
    }