From 32d17447a258188b2d534bcb0bf65a659ba7b7d0 Mon Sep 17 00:00:00 2001 From: mcentner Date: Fri, 29 Aug 2008 12:11:34 +0000 Subject: Initial import. git-svn-id: https://joinup.ec.europa.eu/svn/mocca/trunk@1 8a26b1a7-26f0-462f-b9ef-d0e30c41f5a4 --- .../gv/egiz/bku/binding/HTTPBindingProcessor.java | 820 +++++++++++++++++++++ 1 file changed, 820 insertions(+) create mode 100644 bkucommon/src/main/java/at/gv/egiz/bku/binding/HTTPBindingProcessor.java (limited to 'bkucommon/src/main/java/at/gv/egiz/bku/binding/HTTPBindingProcessor.java') diff --git a/bkucommon/src/main/java/at/gv/egiz/bku/binding/HTTPBindingProcessor.java b/bkucommon/src/main/java/at/gv/egiz/bku/binding/HTTPBindingProcessor.java new file mode 100644 index 00000000..b79f7d55 --- /dev/null +++ b/bkucommon/src/main/java/at/gv/egiz/bku/binding/HTTPBindingProcessor.java @@ -0,0 +1,820 @@ +/* +* Copyright 2008 Federal Chancellery Austria and +* Graz University of Technology +* +* 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 at.gv.egiz.bku.binding; + +import java.io.IOException; +import java.io.InputStream; +import java.io.InputStreamReader; +import java.io.OutputStream; +import java.io.OutputStreamWriter; +import java.io.Reader; +import java.security.cert.X509Certificate; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collection; +import java.util.Collections; +import java.util.HashMap; +import java.util.Iterator; +import java.util.List; +import java.util.Locale; +import java.util.Map; + +import javax.net.ssl.SSLHandshakeException; +import javax.xml.transform.Transformer; +import javax.xml.transform.TransformerException; +import javax.xml.transform.TransformerFactory; +import javax.xml.transform.URIResolver; +import javax.xml.transform.stream.StreamResult; +import javax.xml.transform.stream.StreamSource; + +import org.apache.commons.logging.Log; +import org.apache.commons.logging.LogFactory; + +import at.gv.egiz.bku.slcommands.SLCommand; +import at.gv.egiz.bku.slcommands.SLCommandContext; +import at.gv.egiz.bku.slcommands.SLCommandFactory; +import at.gv.egiz.bku.slcommands.SLCommandInvoker; +import at.gv.egiz.bku.slcommands.SLResult; +import at.gv.egiz.bku.slcommands.SLSourceContext; +import at.gv.egiz.bku.slcommands.SLTargetContext; +import at.gv.egiz.bku.slcommands.impl.ErrorResultImpl; +import at.gv.egiz.bku.slexceptions.SLBindingException; +import at.gv.egiz.bku.slexceptions.SLCanceledException; +import at.gv.egiz.bku.slexceptions.SLException; +import at.gv.egiz.bku.slexceptions.SLRuntimeException; +import at.gv.egiz.bku.utils.StreamUtil; +import at.gv.egiz.bku.utils.binding.Protocol; +import at.gv.egiz.bku.utils.urldereferencer.FormDataURLSupplier; +import at.gv.egiz.bku.utils.urldereferencer.SimpleFormDataContextImpl; +import at.gv.egiz.bku.utils.urldereferencer.StreamData; +import at.gv.egiz.bku.utils.urldereferencer.URIResolverAdapter; +import at.gv.egiz.bku.utils.urldereferencer.URLDereferencer; +import at.gv.egiz.bku.utils.urldereferencer.URLDereferencerContext; +import at.gv.egiz.stal.QuitRequest; +import at.gv.egiz.stal.STALRequest; + +/** + * Class performing the HTTP binding as defined by the CCE specification. + * Currently a huge monolithic class. + * @TODO refactor + */ +@SuppressWarnings("unchecked") +public class HTTPBindingProcessor extends AbstractBindingProcessor implements + FormDataURLSupplier { + + private static Log log = LogFactory.getLog(HTTPBindingProcessor.class); + + private static enum State { + INIT, PROCESS, DATAURL, TRANSFORM, FINISHED + }; + + public final static Collection XML_REQ_TRANSFER_ENCODING = Arrays + .asList(new String[] { "binary" }); + + /** + * Defines the maximum number of dataurl connects that are allowed within a + * single SL Request processing. + */ + protected static int MAX_DATAURL_HOPS = 10; + + protected static String XML_MIME_TYPE = "text/xml"; + protected static String BINARY_MIME_TYPE = "application/octet-stream"; + + /** + * If null everything is ok and the result is taken from the command invoker. + */ + protected SLException bindingProcessorError; + protected SLCommandInvoker commandInvoker; + protected DataUrlResponse dataUrlResponse; + protected Map headerMap = Collections.EMPTY_MAP; + protected SLCommand slCommand; + protected Map formParameterMap = new HashMap(); + protected SLSourceContext srcContex = new SLSourceContext(); + protected SLTargetContext targetContext = new SLTargetContext(); + protected Protocol protocol; + protected State currentState = State.INIT; + protected Transformer transformer = null; + protected String resultContentType = null; + protected SLResult slResult = null; + protected int responseCode = 200; + protected Map responseHeaders = Collections.EMPTY_MAP; + protected Locale locale = Locale.getDefault(); + + /** + * + * @param id + * may be null. In this case a new session id will be created. + * @param cmdInvoker + * must not be null; + */ + public HTTPBindingProcessor(String id, SLCommandInvoker cmdInvoker, + Protocol protocol) { + super(id); + if ((protocol != Protocol.HTTP) && (protocol != Protocol.HTTPS)) { + throw new SLRuntimeException("Protocol not supported: " + protocol); + } + if (cmdInvoker == null) { + throw new NullPointerException("Commandinvoker cannot be set to null"); + } + commandInvoker = cmdInvoker; + this.protocol = protocol; + srcContex.setSourceProtocol(protocol); + srcContex.setSourceIsDataURL(false); + } + + //---------------------------------------------------------------------------- + // ----------- BEGIN CONVENIENCE METHODS ----------- + + protected void sendSTALQuit() { + log.info("Sending QUIT command to STAL"); + List quit = new ArrayList(1); + quit.add(new QuitRequest()); + getSTAL().handleRequest(quit); + } + + protected String getFormParameterAsString(String formParameterName) { + FormParameter fp = formParameterMap.get(formParameterName); + return getFormParameterAsString(fp); + } + + protected String getFormParameterAsString(FormParameter fp) { + if (fp == null) { + return null; + } + try { + return StreamUtil.asString(fp.getFormParameterValue(), HttpUtil + .getCharset(fp.getFormParameterContentType(), true)); + } catch (IOException e) { + return null; + } + } + + protected String getDataUrl() { + return getFormParameterAsString(FixedFormParameters.DATAURL); + } + + protected String getStyleSheetUrl() { + return getFormParameterAsString(FixedFormParameters.STYLESHEETURL); + } + + protected List getFormParameters(String parameterNamePostfix) { + List resultList = new ArrayList(); + for (Iterator fpi = formParameterMap.keySet().iterator(); fpi + .hasNext();) { + String paramName = fpi.next(); + if (paramName.endsWith(parameterNamePostfix)) { + resultList.add(formParameterMap.get(paramName)); + } + } + return resultList; + } + + protected List getTransferHeaders() { + return getFormParameters("__"); + } + + protected List getTransferForms() { + List resultList = new ArrayList(); + for (Iterator fpi = formParameterMap.keySet().iterator(); fpi + .hasNext();) { + String paramName = fpi.next(); + if ((paramName.endsWith("_")) && (!paramName.endsWith("__"))) { + resultList.add(formParameterMap.get(paramName)); + } + } + return resultList; + } + + protected void closeDataUrlConnection() { + log.debug("Closing data url input stream"); + if (dataUrlResponse == null) { + return; + } + InputStream is = dataUrlResponse.getStream(); + if (is != null) { + try { + is.close(); + } catch (IOException e) { + log.info("Error closing input stream to dataurl server:" + e); + } + } + } + + //---------------------------------------------------------------------------- + // ----------- END CONVENIENCE METHODS ----------- + + //---------------------------------------------------------------------------- + // -- BEGIN Methods that handle the http binding activities as defined in the + // activity diagram -- + + protected void init() { + log.info("Starting Bindingprocessor in Thread: " + + Thread.currentThread().getId()); + if (bindingProcessorError != null) { + log.debug("Detected binding processor error, sending quit command"); + // sendSTALQuit(); + currentState = State.FINISHED; + } else if (slCommand == null) { + log.error("SLCommand not set (consumeRequest not called ??)"); + bindingProcessorError = new SLException(2000); + // sendSTALQuit(); + currentState = State.FINISHED; + } else { + currentState = State.PROCESS; + } + } + + protected void processRequest() { + log.debug("Entered State: " + State.PROCESS); + log.debug("Processing command: " + slCommand); + commandInvoker.setCommand(slCommand); + responseCode = 200; + responseHeaders = Collections.EMPTY_MAP; + try { + commandInvoker.invoke(srcContex); + } catch (SLCanceledException e) { + log.info("Caught exception: " + e); + bindingProcessorError = e; + currentState = State.TRANSFORM; + } + dataUrlResponse = null; + if (getDataUrl() != null) { + log.debug("Data Url set to: " + getDataUrl()); + currentState = State.DATAURL; + } else { + log.debug("No data url set"); + currentState = State.TRANSFORM; + } + } + + protected void handleDataUrl() { + log.debug("Entered State: " + State.DATAURL); + try { + DataUrl dataUrl = new DataUrl(getDataUrl()); + DataUrlConnection conn = dataUrl.openConnection(); + + // set transfer headers + for (FormParameter fp : getTransferHeaders()) { + String paramString = getFormParameterAsString(fp); + if (paramString == null) { + log.error("Got empty transfer header, ignoring this"); + } else { + String[] keyVal = paramString.split(":", 2); + String key = keyVal[0]; + String val = null; + if (keyVal.length == 2) { + val = keyVal[1]; + } + val = val.trim(); + log.debug("Setting header " + key + " to value " + val); + conn.setHTTPHeader(key, val); + } + } + + // set transfer form parameters + for (FormParameter fp : getTransferForms()) { + String contentTransferEncoding = null; + String contentType = fp.getFormParameterContentType(); + String charSet = HttpUtil.getCharset(contentType, false); + if (charSet != null) { + contentType = contentType.substring(0, contentType + .lastIndexOf(HttpUtil.SEPERATOR[0])); + } + for (Iterator header = fp.getHeaderNames(); header.hasNext();) { + if (HttpUtil.CONTENT_TRANSFER_ENCODING + .equalsIgnoreCase(header.next())) { + contentTransferEncoding = getFormParameterAsString(fp); + } + } + log.debug("Setting form: " + fp.getFormParameterName() + + " contentType: " + contentType + " charset: " + charSet + + " contentTransferEncoding: " + contentTransferEncoding); + conn.setHTTPFormParameter(fp.getFormParameterName(), fp + .getFormParameterValue(), contentType, charSet, + contentTransferEncoding); + } + + // connect + conn.connect(); + // fetch and set SL result + targetContext.setTargetIsDataURL(true); + targetContext.setTargetCertificate(conn.getServerCertificate()); + targetContext.setTargetProtocol(conn.getProtocol()); + SLResult result = commandInvoker.getResult(targetContext); + + // transfer result + conn.transmit(result); + + // process Dataurl response + dataUrlResponse = conn.getResponse(); + log.debug("Received data url response code: " + + dataUrlResponse.getResponseCode()); + protocol = Protocol.fromString(conn.getProtocol()); + + switch (dataUrlResponse.getResponseCode()) { + case 200: + String contentType = dataUrlResponse.getContentType(); + log.debug("Got dataurl response content type: " + contentType); + if (contentType != null) { + if ((contentType.startsWith(HttpUtil.APPLICATION_URL_ENCODED)) + || (contentType.startsWith(HttpUtil.MULTIPART_FOTMDATA))) { + log.debug("Detected SL Request in dataurl response"); + // process headers and request + setHTTPHeaders(dataUrlResponse.getResponseHeaders()); + consumeRequestStream(dataUrlResponse.getStream()); + closeDataUrlConnection(); + srcContex.setSourceCertificate(conn.getServerCertificate()); + srcContex.setSourceIsDataURL(true); + srcContex + .setSourceProtocol(Protocol.fromString(conn.getProtocol())); + currentState = State.PROCESS; + } else if (((contentType.startsWith(HttpUtil.TXT_HTML)) + || (contentType.startsWith(HttpUtil.TXT_PLAIN)) || (contentType + .startsWith(HttpUtil.TXT_XML))) + && (dataUrlResponse.isHttpResponseXMLOK())) { + log.info("Dataurl response matches with content type: " + + contentType); + currentState = State.TRANSFORM; + + } else if ((contentType.startsWith(HttpUtil.TXT_XML)) + && (!dataUrlResponse.isHttpResponseXMLOK())) { + log + .debug("Detected text/xml dataurl response with content != "); + headerMap.put(HttpUtil.HTTP_HEADER_CONTENT_TYPE, contentType); + assignXMLRequest(dataUrlResponse.getStream(), HttpUtil.getCharset( + contentType, true)); + closeDataUrlConnection(); + srcContex.setSourceCertificate(conn.getServerCertificate()); + srcContex.setSourceIsDataURL(true); + srcContex + .setSourceProtocol(Protocol.fromString(conn.getProtocol())); + currentState = State.PROCESS; + // just to be complete, actually not used + srcContex.setSourceHTTPReferer(dataUrlResponse.getResponseHeaders() + .get(HttpUtil.HTTP_HEADER_REFERER)); + } else { + resultContentType = contentType; + responseHeaders = dataUrlResponse.getResponseHeaders(); + responseCode = dataUrlResponse.getResponseCode(); + currentState = State.FINISHED; + } + } else { + log.debug("Content type not set in dataurl response"); + closeDataUrlConnection(); + throw new SLBindingException(2007); + } + + break; + case 307: + contentType = dataUrlResponse.getContentType(); + if ((contentType != null) && (contentType.startsWith(HttpUtil.TXT_XML))) { + log.debug("Received dataurl response code 307 with XML content"); + String location = dataUrlResponse.getResponseHeaders().get( + HttpUtil.HTTP_HEADER_LOCATION); + if (location == null) { + log + .error("Did not get a location header for a 307 data url response"); + throw new SLBindingException(2003); + } + // consumeRequestStream(dataUrlResponse.getStream()); + FormParameterStore fp = new FormParameterStore(); + fp.init(location.getBytes(HttpUtil.DEFAULT_CHARSET), + FixedFormParameters.DATAURL, null, null); + formParameterMap.put(FixedFormParameters.DATAURL, fp); + headerMap.put(HttpUtil.HTTP_HEADER_CONTENT_TYPE, contentType); + assignXMLRequest(dataUrlResponse.getStream(), HttpUtil.getCharset( + dataUrlResponse.getContentType(), true)); + closeDataUrlConnection(); + srcContex.setSourceCertificate(conn.getServerCertificate()); + srcContex.setSourceIsDataURL(true); + srcContex.setSourceProtocol(Protocol.fromString(conn.getProtocol())); + currentState = State.PROCESS; + // just to be complete, actually not used + srcContex.setSourceHTTPReferer(dataUrlResponse.getResponseHeaders() + .get(HttpUtil.HTTP_HEADER_REFERER)); + + } else { + log.debug("Received dataurl response code 307 non XML content: " + + dataUrlResponse.getContentType()); + resultContentType = dataUrlResponse.getContentType(); + currentState = State.FINISHED; + } + responseHeaders = dataUrlResponse.getResponseHeaders(); + responseCode = dataUrlResponse.getResponseCode(); + break; + + case 301: + case 302: + case 303: + responseHeaders = dataUrlResponse.getResponseHeaders(); + responseCode = dataUrlResponse.getResponseCode(); + resultContentType = dataUrlResponse.getContentType(); + currentState = State.FINISHED; + break; + + default: + // issue error + log.info("Unexpected response code from dataurl server: " + + dataUrlResponse.getResponseCode()); + throw new SLBindingException(2007); + } + + } catch (SLException slx) { + bindingProcessorError = slx; + log.error("Error during dataurl communication"); + resultContentType = HttpUtil.TXT_XML; + currentState = State.TRANSFORM; + } catch (SSLHandshakeException hx) { + bindingProcessorError = new SLException(2010); + log.info("Error during dataurl communication", hx); + resultContentType = HttpUtil.TXT_XML; + currentState = State.TRANSFORM; + } catch (IOException e) { + bindingProcessorError = new SLBindingException(2001); + log.error("Error while data url handling", e); + resultContentType = HttpUtil.TXT_XML; + currentState = State.TRANSFORM; + return; + } + } + + protected void transformResult() { + log.debug("Entered State: " + State.TRANSFORM); + if (bindingProcessorError != null) { + resultContentType = HttpUtil.TXT_XML; + } else if (dataUrlResponse != null) { + resultContentType = dataUrlResponse.getContentType(); + } else { + targetContext.setTargetIsDataURL(false); + targetContext.setTargetProtocol(protocol.toString()); + try { + slResult = commandInvoker.getResult(targetContext); + resultContentType = slResult.getMimeType(); + log + .debug("Successfully got SLResult from commandinvoker, setting mimetype to: " + + resultContentType); + } catch (SLCanceledException e) { + log.info("Cannot get result from invoker:", e); + bindingProcessorError = new SLException(6002); + resultContentType = HttpUtil.TXT_XML; + } + } + transformer = getTransformer(getStyleSheetUrl()); + if (transformer != null) { + log.debug("Output transformation required"); + resultContentType = transformer.getOutputProperty("media-type"); + log.debug("Got media type from stylesheet: " + resultContentType); + if (resultContentType == null) { + log.debug("Setting to default text/xml result conent type"); + resultContentType = "text/xml"; + } + log.debug("Deferring sytylesheet processing"); + } + currentState = State.FINISHED; + } + + protected void finished() { + log.debug("Entered State: " + State.FINISHED); + if (bindingProcessorError != null) { + log.debug("Binding processor error, sending quit command"); + resultContentType = HttpUtil.TXT_XML; + } + sendSTALQuit(); + log.info("Terminating Bindingprocessor; Thread: " + + Thread.currentThread().getId()); + } + + // -- END Methods that handle the http binding activities as defined in the + // activity diagram -- + //---------------------------------------------------------------------------- + + /** + * Sets the headers of the SL Request. IMPORTANT: make sure to set all headers + * before invoking {@link #consumeRequestStream(InputStream)} + * + * @param aHeaderMap + * if null all header will be cleared. + */ + public void setHTTPHeaders(Map aHeaderMap) { + headerMap = new HashMap(); + // ensure lowercase keys + if (aHeaderMap != null) { + for (String s : aHeaderMap.keySet()) { + if (s != null) { + headerMap.put(s.toLowerCase(), aHeaderMap.get(s)); + if (s.equalsIgnoreCase(HttpUtil.HTTP_HEADER_REFERER)) { + String referer = aHeaderMap.get(s); + log.debug("Got referer header: " + referer); + srcContex.setSourceHTTPReferer(referer); + } + } + } + } + } + + public void setSourceCertificate(X509Certificate aCert) { + srcContex.setSourceCertificate(aCert); + } + + /** + * The HTTPBindingProcessor does not handle redirect URLs. It only provides + * the parameter. + * + * @return null if redirect url is not set. + */ + public String getRedirectURL() { + return getFormParameterAsString(FixedFormParameters.REDIRECTURL); + } + + public String getFormDataContentType(String aParameterName) { + FormParameter fp = formParameterMap.get(aParameterName); + if (fp != null) { + return fp.getFormParameterContentType(); + } + return null; + } + + public InputStream getFormData(String aParameterName) { + FormParameter fp = formParameterMap.get(aParameterName); + if (fp != null) { + return fp.getFormParameterValue(); + } + return null; + } + + protected void assignXMLRequest(InputStream is, String charset) + throws IOException, SLException { + Reader r = new InputStreamReader(is, charset); + StreamSource source = new StreamSource(r); + SLCommandContext commandCtx = new SLCommandContext(); + commandCtx.setSTAL(getSTAL()); + commandCtx.setURLDereferencerContext(new SimpleFormDataContextImpl(this)); + slCommand = SLCommandFactory.getInstance().createSLCommand(source, + commandCtx); + log.debug("Created new command: " + slCommand); + } + + @Override + public void run() { + boolean done = false; + int hopcounter = 0; + if (bindingProcessorError != null) { + currentState = State.FINISHED; + } + try { + while (!done) { + try { + switch (currentState) { + case INIT: + init(); + break; + case PROCESS: + processRequest(); + break; + case DATAURL: + handleDataUrl(); + if (++hopcounter > MAX_DATAURL_HOPS) { + log.error("Maximum number of dataurl hops reached"); + bindingProcessorError = new SLBindingException(2000); + currentState = State.FINISHED; + } + break; + case TRANSFORM: + transformResult(); + break; + case FINISHED: + done = true; + finished(); + break; + } + } catch (RuntimeException rte) { + throw rte; + } catch (Exception t) { + log.error("Caught unexpected exception", t); + responseCode = 200; + resultContentType = HttpUtil.TXT_XML; + responseHeaders = Collections.EMPTY_MAP; + bindingProcessorError = new SLException(2000); + currentState = State.FINISHED; + } + } + } catch (Throwable t) { + log.error("Caught unexpected exception", t); + responseCode = 200; + resultContentType = HttpUtil.TXT_XML; + responseHeaders = Collections.EMPTY_MAP; + bindingProcessorError = new SLException(2000); + currentState = State.FINISHED; + } + log.debug("Terminated http binding processor"); + } + + @Override + public void consumeRequestStream(InputStream is) { + try { + log.debug("Start consuming request stream"); + formParameterMap.clear(); + String cl = headerMap + .get(HttpUtil.HTTP_HEADER_CONTENT_TYPE.toLowerCase()); + if (cl == null) { + log.info("No content type set in http header"); + throw new SLBindingException(2006); + } + InputDecoder id = InputDecoderFactory.getDecoder(cl, is); + id.setContentType(cl); + if (id == null) { + log.error("Cannot get inputdecoder for is"); + throw new SLException(2006); + } + for (Iterator fpi = id.getFormParameterIterator(); fpi + .hasNext();) { + FormParameter fp = fpi.next(); + log.debug("Got request parameter with name: " + + fp.getFormParameterName()); + if (fp.getFormParameterName().equals(FixedFormParameters.XMLREQUEST)) { + log.debug("Creating XML Request"); + for (Iterator headerIterator = fp.getHeaderNames(); headerIterator + .hasNext();) { + String headerName = headerIterator.next(); + if (HttpUtil.CONTENT_TRANSFER_ENCODING.equalsIgnoreCase(headerName)) { + String transferEncoding = fp.getHeaderValue(headerName); + log.debug("Got transfer encoding for xmlrequest: " + + transferEncoding); + if (XML_REQ_TRANSFER_ENCODING.contains(transferEncoding)) { + log.debug("Supported transfer encoding: " + transferEncoding); + } else { + log + .error("Transferencoding not supported: " + + transferEncoding); + throw new SLBindingException(2005); + } + } + } + String charset = HttpUtil.getCharset(cl, true); + assignXMLRequest(fp.getFormParameterValue(), charset); + } else { + FormParameterStore fps = new FormParameterStore(); + fps.init(fp); + if (!fps.isEmpty()) { + log.debug("Setting from parameter: " + fps.getFormParameterName()); + formParameterMap.put(fps.getFormParameterName(), fps); + } + } + } + if (slCommand == null) { + throw new SLBindingException(2004); + } + if (is.read() != -1) { + log.error("Request input stream not completely read"); + // consume rest of stream, should never occur + throw new SLRuntimeException( + "request input stream not consumed till end"); + } + } catch (SLException slx) { + log.info("Error while consuming input stream " + slx); + bindingProcessorError = slx; + } catch (Throwable t) { + log.info("Error while consuming input stream " + t, t); + bindingProcessorError = new SLException(2000); + } finally { + try { + while (is.read() != -1) + ; + } catch (IOException e) { + log.error(e); + } + } + } + + @Override + public String getResultContentType() { + return resultContentType; + } + + protected Transformer getTransformer(String styleSheetURL) { + if (styleSheetURL == null) { + log.debug("Stylesheet URL not set"); + return null; + } + try { + URLDereferencerContext urlCtx = new SimpleFormDataContextImpl(this); + URIResolver resolver = new URIResolverAdapter(URLDereferencer + .getInstance(), urlCtx); + TransformerFactory factory = TransformerFactory.newInstance(); + StreamData sd = URLDereferencer.getInstance().dereference(styleSheetURL, + urlCtx); + Transformer t = factory.newTransformer(new StreamSource(sd.getStream())); + t.setURIResolver(resolver); + return t; + } catch (Exception ex) { + log.info("Cannot instantiate transformer", ex); + bindingProcessorError = new SLException(2002); + return null; + } + } + + protected void handleBindingProcessorError(OutputStream os, String encoding, + Transformer transformer) throws IOException { + log.debug("Writing error as result"); + ErrorResultImpl error = new ErrorResultImpl(bindingProcessorError); + try { + error.writeTo(new StreamResult(new OutputStreamWriter(os, encoding)), + transformer); + } catch (TransformerException e) { + log.fatal("Cannot write error result to stream", e); + } + } + + @Override + public void writeResultTo(OutputStream os, String encoding) + throws IOException { + if (encoding == null) { + encoding = HttpUtil.DEFAULT_CHARSET; + } + if (bindingProcessorError != null) { + log.debug("Detected error in binding processor, writing error as result"); + handleBindingProcessorError(os, encoding, transformer); + return; + } else if (dataUrlResponse != null) { + log.debug("Writing data url response as result"); + String charEnc = HttpUtil.getCharset(dataUrlResponse.getContentType(), + true); + InputStreamReader isr = new InputStreamReader( + dataUrlResponse.getStream(), charEnc); + OutputStreamWriter osw = new OutputStreamWriter(os, encoding); + if (transformer == null) { + StreamUtil.copyStream(isr, osw); + } else { + try { + transformer.transform(new StreamSource(isr), new StreamResult(osw)); + } catch (TransformerException e) { + log.fatal("Exception occured during result transformation", e); + // bindingProcessorError = new SLException(2008); + // handleBindingProcessorError(os, encoding, null); + return; + } + } + osw.flush(); + isr.close(); + } else if (slResult == null) { + // result not yet assigned -> must be a cancel + bindingProcessorError = new SLException(6001); + handleBindingProcessorError(os, encoding, transformer); + return; + } else { + log.debug("Getting result from invoker"); + OutputStreamWriter osw = new OutputStreamWriter(os, encoding); + try { + slResult.writeTo(new StreamResult(osw), transformer); + } catch (TransformerException e) { + log.fatal("Cannot write result to stream", e); + // bindingProcessorError = new SLException(2008); + // handleBindingProcessorError(os, encoding, transformer); + } + osw.flush(); + } + } + + /** + * The response code from the dataurl server or 200 if no dataurl server + * created the result + * + * @return + */ + public int getResponseCode() { + return responseCode; + } + + /** + * All headers from the data url server in case of a direct forward from the + * dataurl server. + * + * @return + */ + public Map getResponseHeaders() { + return responseHeaders; + } + + @Override + public void setLocale(Locale locale) { + if (locale == null) { + throw new NullPointerException("Locale must not be set to null"); + } + this.locale = locale; + } + +} \ No newline at end of file -- cgit v1.2.3