Java tutorial
/* * Copyright 2005,2006 WSO2, Inc. http://www.wso2.org * * 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.wso2.carbon.relay.module.handler; import java.io.IOException; import java.io.InputStream; import javax.activation.DataHandler; import javax.activation.DataSource; import javax.xml.stream.XMLStreamException; import org.apache.axiom.om.OMElement; import org.apache.axiom.om.OMException; import org.apache.axiom.om.OMNode; import org.apache.axiom.om.OMText; import org.apache.axiom.soap.SOAPEnvelope; import org.apache.axis2.AxisFault; import org.apache.axis2.Constants; import org.apache.axis2.context.MessageContext; import org.apache.axis2.description.AxisService; import org.apache.axis2.description.AxisServiceGroup; import org.apache.axis2.description.HandlerDescription; import org.apache.axis2.description.Parameter; import org.apache.axis2.handlers.AbstractHandler; import org.apache.axis2.transport.TransportUtils; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.wso2.carbon.relay.StreamingOnRequestDataSource; import org.wso2.carbon.relay.RelayConstants; import org.wso2.carbon.relay.MessageBuilder; import org.wso2.carbon.relay.module.RelayConfiguration; /** * This is a protection against the relay to make sure it does not interfere with other things. Basically, this hander * will undo the wrapping done by the relay for certain services/patterns. * * @author Srinath Perera (srinath@wso2.com) */ public class SkipAdminServiceHandler extends AbstractHandler { private static final Log log = LogFactory.getLog(TransportUtils.class); public static final String ADMIN_SERVICE_PARAM_NAME = "adminService"; public static final String HIDDEN_SERVICE_PARAM_NAME = "hiddenService"; public InvocationResponse invoke(MessageContext msgContext) throws AxisFault { try { Parameter relayParam = msgContext.getParameter(RelayConstants.RELAY_CONFIG_PARAM); if (relayParam == null) { handleException("Relay not initialized"); } RelayConfiguration relConf = (RelayConfiguration) relayParam.getValue(); if (relConf == null) { handleException("Relay not initialized"); } if (isFilteredOutService(msgContext.getAxisService(), relConf)) { SOAPEnvelope envelope = msgContext.getEnvelope(); OMElement contentEle = envelope.getBody() .getFirstChildWithName(RelayConstants.BINARY_CONTENT_QNAME); if (contentEle != null) { OMNode node = contentEle.getFirstOMChild(); if (node != null && (node instanceof OMText)) { OMText binaryDataNode = (OMText) node; DataHandler dh = (DataHandler) binaryDataNode.getDataHandler(); if (dh == null) { if (log.isDebugEnabled()) { log.warn("Message has the Binary content element. " + "But doesn't have binary content embedded within it"); } return InvocationResponse.CONTINUE; } DataSource dataSource = dh.getDataSource(); //Ask the data source to stream, if it has not alredy cached the request if (dataSource instanceof StreamingOnRequestDataSource) { ((StreamingOnRequestDataSource) dataSource).setLastUse(true); } InputStream in = dh.getInputStream(); //extract the wrapped binary content //Select the right builder, create the envelope and stick it in. String contentType = (String) msgContext.getProperty(Constants.Configuration.CONTENT_TYPE); OMElement element = relConf.getMessageBuilder().getDocument(contentType, msgContext, in); if (element != null) { msgContext.setEnvelope(TransportUtils.createSOAPEnvelope(element)); msgContext.setProperty(MessageBuilder.RELAY_FORMATTERS_MAP, relConf.getMessageBuilder().getFormatters()); } else { log.warn("Error building the message, skipping message building"); } //now we have undone thing done by Relay if (log.isDebugEnabled()) { log.debug("Undo wrapping done by Relay"); } } else { //if is not wrapped binary content, there is nothing to be done if (log.isDebugEnabled()) { log.debug("not wrapped binary content, there is nothing to be done"); } } } else { //there is no body content, we will let it go if (log.isDebugEnabled()) { log.debug("Body of the Soap Envelope is empty, nothing to unwrap"); } } } else { if (log.isDebugEnabled()) { log.debug("Not a admin service, nothing to be done"); } } return InvocationResponse.CONTINUE; } catch (OMException e) { throw AxisFault.makeFault(e); } catch (IOException e) { throw AxisFault.makeFault(e); } catch (XMLStreamException e) { throw AxisFault.makeFault(e); } } @Override public void init(HandlerDescription handlerdesc) { } public boolean isFilteredOutService(AxisService service, RelayConfiguration relConf) { if (relConf.getServices().contains(service.getName())) { return true; } if ("__SynapseService".equals(service.getName())) { return false; } else if ("__MultitenantDispatcherService".equals(service.getName())) { return false; } AxisServiceGroup axisServiceGroup = (AxisServiceGroup) service.getParent(); String adminParamValue = (String) axisServiceGroup.getParameterValue(ADMIN_SERVICE_PARAM_NAME); if (adminParamValue == null) { adminParamValue = (String) service.getParameterValue(ADMIN_SERVICE_PARAM_NAME); } String hiddenParamValue = (String) axisServiceGroup.getParameterValue(HIDDEN_SERVICE_PARAM_NAME); if (hiddenParamValue == null) { hiddenParamValue = (String) service.getParameterValue(HIDDEN_SERVICE_PARAM_NAME); } if (Boolean.parseBoolean(adminParamValue)) { return true; } else if (relConf.isIncludeHiddenServices() && Boolean.parseBoolean(hiddenParamValue)) { return true; } else { return false; } } private void handleException(String msg) throws AxisFault { log.error(msg); throw new AxisFault(msg); } }