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; import org.apache.axiom.om.*; 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.Parameter; import org.apache.axis2.transport.MessageFormatter; import org.apache.axis2.transport.http.HTTPConstants; import org.apache.axis2.transport.http.SOAPMessageFormatter; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import javax.activation.DataHandler; import javax.activation.DataSource; import javax.xml.stream.XMLStreamException; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.OutputStream; import java.net.URL; import java.util.Map; public class ExpandingMessageFormatter extends SOAPMessageFormatter { private Log log = LogFactory.getLog(ExpandingMessageFormatter.class); private static final String MESSAGE_AS_BYTES = "MESSAGE_AS_BYTES"; @Override public byte[] getBytes(MessageContext messageContext, OMOutputFormat format) throws AxisFault { SOAPEnvelope envelope = messageContext.getEnvelope(); if (hasASoapMessageEmbeded(envelope)) { ByteArrayOutputStream out = new ByteArrayOutputStream(); findAndWrite2OutputStream(messageContext, out, false); return out.toByteArray(); } else { return super.getBytes(messageContext, format); } } @Override public String getContentType(MessageContext msgCtxt, OMOutputFormat format, String soapActionString) { String contentType = (String) msgCtxt.getProperty(Constants.Configuration.CONTENT_TYPE); if (contentType == null) { MessageFormatter formatter = getMessageFormatter(msgCtxt); if (formatter != null) { contentType = formatter.getContentType(msgCtxt, format, soapActionString); } else { String messageType = getMessageFormatterProperty(msgCtxt); if (messageType.equals(HTTPConstants.MEDIA_TYPE_X_WWW_FORM)) { contentType = messageType; String encoding = format.getCharSetEncoding(); if (encoding != null) { contentType += "; charset=" + encoding; } } else { contentType = super.getContentType(msgCtxt, format, soapActionString); } } } return contentType; } @Override public void writeTo(MessageContext messageContext, OMOutputFormat format, OutputStream outputStream, boolean preserve) throws AxisFault { try { byte[] messageAsBytes = (byte[]) messageContext.getOperationContext().getProperty(MESSAGE_AS_BYTES); if (messageAsBytes != null) { outputStream.write(messageAsBytes); } else { SOAPEnvelope envelope = messageContext.getEnvelope(); Object forcedFormatter; if (hasASoapMessageEmbeded(envelope)) { findAndWrite2OutputStream(messageContext, outputStream, preserve); } else if ((forcedFormatter = messageContext .getProperty(MessageBuilder.FORCED_RELAY_FORMATTER)) != null) { /** If a formatter is forced by the builder mediator or some other means, * it gets preference */ if (forcedFormatter instanceof MessageFormatter) { ((MessageFormatter) forcedFormatter).writeTo(messageContext, format, outputStream, preserve); } else { String msg = "Invalid formatter is forced by " + MessageBuilder.FORCED_RELAY_FORMATTER + " property."; log.error(msg); throw new AxisFault(msg); } } else { // try to get the formatters from the map set by the builder mediator or // SkipAdminHandler MessageFormatter formatter = getMessageFormatter(messageContext); if (formatter != null) { formatter.writeTo(messageContext, format, outputStream, preserve); } else { super.writeTo(messageContext, format, outputStream, preserve); } } } } catch (IOException e) { throw AxisFault.makeFault(e); } } @Override public URL getTargetAddress(MessageContext msgCtxt, OMOutputFormat format, URL targetURL) throws AxisFault { if (!msgCtxt.isDoingREST()) { return super.getTargetAddress(msgCtxt, format, targetURL); } return targetURL; } public void writeAsREST(MessageContext messageContext, OMOutputFormat format, OutputStream outputStream, boolean preserve) throws AxisFault { OMElement element = messageContext.getEnvelope().getBody().getFirstElement(); try { if (element != null) { if (preserve) { element.serialize(outputStream, format); } else { element.serializeAndConsume(outputStream, format); } } outputStream.flush(); } catch (XMLStreamException e) { String msg = "Error writing Rest message"; log.error(msg, e); throw new AxisFault(msg, e); } catch (IOException e) { String msg = "Error writing text message to stream"; log.error(msg); throw new AxisFault(msg, e); } } private boolean hasASoapMessageEmbeded(SOAPEnvelope envelope) { OMElement contentEle = envelope.getBody().getFirstElement(); return contentEle != null && contentEle.getQName().equals(RelayConstants.BINARY_CONTENT_QNAME); } private void findAndWrite2OutputStream(MessageContext messageContext, OutputStream out, boolean preserve) throws AxisFault { try { SOAPEnvelope envelope = messageContext.getEnvelope(); OMElement contentEle = envelope.getBody().getFirstElement(); if (contentEle != null) { OMNode node = contentEle.getFirstOMChild(); if (!(node instanceof OMText)) { String msg = "Wrong Input for the Validator, " + "the content of the first child element of the Body " + "should have the zip file"; log.error(msg); throw new AxisFault(msg); } OMText binaryDataNode = (OMText) node; DataHandler dh = (DataHandler) binaryDataNode.getDataHandler(); DataSource dataSource = dh.getDataSource(); if (dataSource instanceof StreamingOnRequestDataSource) { if (((StreamingOnRequestDataSource) dataSource).isConsumed()) { Object httpMethodObj = messageContext.getProperty(Constants.Configuration.HTTP_METHOD); if ((httpMethodObj instanceof String) && Constants.Configuration.HTTP_METHOD_POST.equals(httpMethodObj)) { log.warn("Attempting to send an already consumed request [" + messageContext.getTo().getAddress() + " POST/Empty Message Body]"); } //Ask the data source to stream, if it has not already cached the request if (!preserve) { ((StreamingOnRequestDataSource) dataSource).setLastUse(true); } } } dh.writeTo(out); } } catch (OMException e) { log.error(e); throw AxisFault.makeFault(e); } catch (IOException e) { log.error(e); throw AxisFault.makeFault(e); } } private static String getMessageFormatterProperty(MessageContext msgContext) { String messageFormatterProperty = null; Object property = msgContext.getProperty(Constants.Configuration.MESSAGE_TYPE); if (property != null) { messageFormatterProperty = (String) property; } if (messageFormatterProperty == null) { Parameter parameter = msgContext.getParameter(Constants.Configuration.MESSAGE_TYPE); if (parameter != null) { messageFormatterProperty = (String) parameter.getValue(); } } return messageFormatterProperty; } private static MessageFormatter getMessageFormatter(MessageContext messageContext) { Object o = messageContext.getProperty(MessageBuilder.RELAY_FORMATTERS_MAP); if (o != null && o instanceof Map) { Map map = (Map) o; String messageFormatString = getMessageFormatterProperty(messageContext); if (messageFormatString != null) { return (MessageFormatter) map.get(messageFormatString); } } return null; } }