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Diffstat (limited to 'sca-java-1.x/branches/sca-java-1.6.2/modules/binding-rss-rome/src/main/java/org/apache/tuscany/sca/binding/rss/provider/RSSBindingListenerServlet.java')
| -rw-r--r-- | sca-java-1.x/branches/sca-java-1.6.2/modules/binding-rss-rome/src/main/java/org/apache/tuscany/sca/binding/rss/provider/RSSBindingListenerServlet.java | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/sca-java-1.x/branches/sca-java-1.6.2/modules/binding-rss-rome/src/main/java/org/apache/tuscany/sca/binding/rss/provider/RSSBindingListenerServlet.java b/sca-java-1.x/branches/sca-java-1.6.2/modules/binding-rss-rome/src/main/java/org/apache/tuscany/sca/binding/rss/provider/RSSBindingListenerServlet.java new file mode 100644 index 0000000000..96493a5150 --- /dev/null +++ b/sca-java-1.x/branches/sca-java-1.6.2/modules/binding-rss-rome/src/main/java/org/apache/tuscany/sca/binding/rss/provider/RSSBindingListenerServlet.java @@ -0,0 +1,397 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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.tuscany.sca.binding.rss.provider; + +import java.io.IOException; +import java.io.OutputStreamWriter; +import java.io.UnsupportedEncodingException; +import java.io.Writer; +import java.net.URLDecoder; +import java.util.ArrayList; +import java.util.Date; +import java.util.List; +import java.util.StringTokenizer; +import java.util.logging.Logger; + +import javax.servlet.ServletException; +import javax.servlet.http.HttpServlet; +import javax.servlet.http.HttpServletRequest; +import javax.servlet.http.HttpServletResponse; +import javax.xml.namespace.QName; + +import org.apache.commons.codec.binary.Base64; +import org.apache.tuscany.sca.data.collection.Item; +import org.apache.tuscany.sca.databinding.Mediator; +import org.apache.tuscany.sca.interfacedef.DataType; +import org.apache.tuscany.sca.interfacedef.Operation; +import org.apache.tuscany.sca.interfacedef.impl.DataTypeImpl; +import org.apache.tuscany.sca.interfacedef.util.XMLType; +import org.apache.tuscany.sca.invocation.InvocationChain; +import org.apache.tuscany.sca.invocation.Invoker; +import org.apache.tuscany.sca.invocation.Message; +import org.apache.tuscany.sca.invocation.MessageFactory; +import org.apache.tuscany.sca.runtime.RuntimeWire; + +import com.sun.syndication.feed.synd.SyndContent; +import com.sun.syndication.feed.synd.SyndContentImpl; +import com.sun.syndication.feed.synd.SyndEntry; +import com.sun.syndication.feed.synd.SyndEntryImpl; +import com.sun.syndication.feed.synd.SyndFeed; +import com.sun.syndication.feed.synd.SyndFeedImpl; +import com.sun.syndication.feed.synd.SyndLink; +import com.sun.syndication.feed.synd.SyndLinkImpl; +import com.sun.syndication.io.FeedException; +import com.sun.syndication.io.SyndFeedOutput; + +/** + * An RSS binding listener, implemented as a Servlet and + * registered in a Servlet host provided by the SCA hosting runtime. + * + * @version $Rev$ $Date$ + */ +class RSSBindingListenerServlet extends HttpServlet { + private static final Logger logger = Logger.getLogger(RSSBindingListenerServlet.class.getName()); + private static final long serialVersionUID = 1L; + + private RuntimeWire wire; + private Invoker getFeedInvoker; + private Invoker getAllInvoker; + private Invoker queryInvoker; + private MessageFactory messageFactory; + private Mediator mediator; + private DataType<?> itemClassType; + private DataType<?> itemXMLType; + private boolean supportsFeedEntries; + + /** + * Constructs a new binding listener. + * + * @param wire + * @param messageFactory + */ + RSSBindingListenerServlet(RuntimeWire wire, MessageFactory messageFactory, Mediator mediator) { + this.wire = wire; + this.messageFactory = messageFactory; + this.mediator = mediator; + + // Get the invokers for the supported operations + Operation getOperation = null; + for (InvocationChain invocationChain : this.wire.getInvocationChains()) { + invocationChain.setAllowsPassByReference(true); + Operation operation = invocationChain.getTargetOperation(); + String operationName = operation.getName(); + if (operationName.equals("getFeed")) { + getFeedInvoker = invocationChain.getHeadInvoker(); + } else if (operationName.equals("getAll")) { + getAllInvoker = invocationChain.getHeadInvoker(); + } else if (operationName.equals("query")) { + queryInvoker = invocationChain.getHeadInvoker(); + } else if (operationName.equals("get")) { + getOperation = operation; + } + } + + // Determine the collection item type + if (getOperation != null) { + itemXMLType = new DataTypeImpl<Class<?>>(String.class.getName(), String.class, String.class); + Class<?> itemClass = getOperation.getOutputType().getPhysical(); + if (itemClass == SyndEntry.class) { + supportsFeedEntries = true; + } + DataType<XMLType> outputType = getOperation.getOutputType(); + QName qname = outputType.getLogical().getElementName(); + qname = new QName(qname.getNamespaceURI(), itemClass.getSimpleName()); + itemClassType = new DataTypeImpl<XMLType>("java:complexType", itemClass, new XMLType(qname, null)); + } + } + + @Override + protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + + // No authentication required for a get request + + // Get the request path + String path = URLDecoder.decode(request.getRequestURI().substring(request.getServletPath().length()), "UTF-8"); + + logger.fine("get " + request.getRequestURI()); + + // Handle an RSS request + if (path == null || path.length() == 0 || path.equals("/")) { + + // Return an RSS feed containing the entries in the collection + SyndFeed feed = null; + if (supportsFeedEntries) { + + // The service implementation supports feed entries, invoke its getFeed operation + Message requestMessage = messageFactory.createMessage(); + Message responseMessage = getFeedInvoker.invoke(requestMessage); + if (responseMessage.isFault()) { + throw new ServletException((Throwable)responseMessage.getBody()); + } + feed = (SyndFeed)responseMessage.getBody(); + + } else { + + // The service implementation does not support feed entries, invoke its + // getAll operation to get the data item collection. then create feed entries + // from the data items + Message requestMessage = messageFactory.createMessage(); + Message responseMessage; + if (request.getQueryString() != null) { + requestMessage.setBody(new Object[] {request.getQueryString()}); + responseMessage = queryInvoker.invoke(requestMessage); + } else { + responseMessage = getAllInvoker.invoke(requestMessage); + } + if (responseMessage.isFault()) { + throw new ServletException((Throwable)responseMessage.getBody()); + } + org.apache.tuscany.sca.data.collection.Entry<Object, Object>[] collection = + (org.apache.tuscany.sca.data.collection.Entry<Object, Object>[])responseMessage.getBody(); + if (collection != null) { + // Create the feed + feed = new SyndFeedImpl(); + feed.setTitle("Feed"); + feed.setDescription("Feed description"); + + for (org.apache.tuscany.sca.data.collection.Entry<Object, Object> entry: collection) { + SyndEntry feedEntry = createFeedEntry(entry); + feed.getEntries().add(feedEntry); + } + } + } + + // Convert to an RSS feed + if (feed != null) { + response.setContentType("application/rss+xml; charset=utf-8"); + feed.setFeedType("rss_2.0"); + feed.setLink(path); + SyndFeedOutput syndOutput = new SyndFeedOutput(); + try { + syndOutput.output(feed, getWriter(response)); + } catch (FeedException e) { + throw new ServletException(e); + } + } else { + response.sendError(HttpServletResponse.SC_NOT_FOUND); + } + } else { + response.sendError(HttpServletResponse.SC_NOT_FOUND); + } + + } + + /** + * Create an RSS entry from a data collection entry. + * @param entry + * @return + */ + private SyndEntry createFeedEntry(org.apache.tuscany.sca.data.collection.Entry<Object, Object> entry) { + Object key = entry.getKey(); + Object data = entry.getData(); + if (data instanceof Item) { + Item item = (Item)data; + + SyndEntry feedEntry = new SyndEntryImpl(); + feedEntry.setUri(key.toString()); + feedEntry.setTitle(item.getTitle()); + + String value = item.getContents(); + if (value != null) { + SyndContent content = new SyndContentImpl(); + content.setType("text/xml"); + content.setValue(value); + List<SyndContent> contents = new ArrayList<SyndContent>(); + contents.add(content); + feedEntry.setContents(contents); + } + + String href = item.getLink(); + if (href == null) { + href = key.toString(); + } + SyndLink link = new SyndLinkImpl(); + link.setRel("edit"); + link.setHref(href); + feedEntry.getLinks().add(link); + link = new SyndLinkImpl(); + link.setRel("alternate"); + link.setHref(href); + feedEntry.getLinks().add(link); + feedEntry.setLink(href); + + Date date = item.getDate(); + if (date == null) { + date = new Date(); + } + feedEntry.setPublishedDate(date); + return feedEntry; + + } else if (data != null) { + SyndEntry feedEntry = new SyndEntryImpl(); + feedEntry.setUri(key.toString()); + feedEntry.setTitle("item"); + + // Convert the item to XML + String value = mediator.mediate(data, itemClassType, itemXMLType, null).toString(); + + SyndContent content = new SyndContentImpl(); + content.setType("text/xml"); + content.setValue(value); + List<SyndContent> contents = new ArrayList<SyndContent>(); + contents.add(content); + feedEntry.setContents(contents); + + SyndLink link = new SyndLinkImpl(); + link.setRel("edit"); + link.setHref(key.toString()); + feedEntry.getLinks().add(link); + link = new SyndLinkImpl(); + link.setRel("alternate"); + link.setHref(key.toString()); + feedEntry.getLinks().add(link); + + feedEntry.setPublishedDate(new Date()); + return feedEntry; + } else { + return null; + } + } + + /** + * Create a data collection entry from an RSS entry. + * @param feedEntry + * @return + */ + private org.apache.tuscany.sca.data.collection.Entry<Object, Object> createEntry(SyndEntry feedEntry) { + if (feedEntry != null) { + if (itemClassType.getPhysical() == Item.class) { + String key = feedEntry.getUri(); + + Item item = new Item(); + item.setTitle(feedEntry.getTitle()); + + List<?> contents = feedEntry.getContents(); + if (!contents.isEmpty()) { + SyndContent content = (SyndContent)contents.get(0); + String value = content.getValue(); + item.setContents(value); + } + + for (Object l : feedEntry.getLinks()) { + SyndLink link = (SyndLink)l; + if (link.getRel() == null || "edit".equals(link.getRel())) { + String href = link.getHref(); + if (href.startsWith("null/")) { + href = href.substring(5); + } + item.setLink(href); + break; + } + } + + item.setDate(feedEntry.getPublishedDate()); + + return new org.apache.tuscany.sca.data.collection.Entry<Object, Object>(key, item); + + } else { + String key = feedEntry.getUri(); + + // Create the item from XML + List<?> contents = feedEntry.getContents(); + if (contents.isEmpty()) { + return null; + } + SyndContent content = (SyndContent)contents.get(0); + String value = content.getValue(); + Object data = mediator.mediate(value, itemXMLType, itemClassType, null); + + return new org.apache.tuscany.sca.data.collection.Entry<Object, Object>(key, data); + } + } else { + return null; + } + } + + + private Writer getWriter(HttpServletResponse response) throws UnsupportedEncodingException, IOException { + Writer writer = new OutputStreamWriter(response.getOutputStream(), "UTF-8"); + return writer; + } + + /** + * Process the authorization header + * + * @param request + * @return + * @throws ServletException + */ + private String processAuthorizationHeader(HttpServletRequest request) throws ServletException { + try { + String authorization = request.getHeader("Authorization"); + if (authorization != null) { + StringTokenizer tokens = new StringTokenizer(authorization); + if (tokens.hasMoreTokens()) { + String basic = tokens.nextToken(); + if (basic.equalsIgnoreCase("Basic")) { + String credentials = tokens.nextToken(); + String userAndPassword = new String(Base64.decodeBase64(credentials.getBytes())); + int colon = userAndPassword.indexOf(":"); + if (colon != -1) { + String user = userAndPassword.substring(0, colon); + String password = userAndPassword.substring(colon + 1); + + // Authenticate the User. + if (authenticate(user, password)) { + return user; + } + } + } + } + } + } catch (Exception e) { + throw new ServletException(e); + } + return null; + } + + /** + * Authenticate a user. + * + * @param user + * @param password + * @return + */ + private boolean authenticate(String user, String password) { + + // TODO Handle this using SCA security policies + //FIXME Why are we using endsWith instead of equals here?? + return ("admin".endsWith(user) && "admin".equals(password)); + } + + /** + * Reject an unauthorized request. + * + * @param response + */ + private void unauthorized(HttpServletResponse response) throws IOException { + response.setHeader("WWW-Authenticate", "BASIC realm=\"Tuscany\""); + response.sendError(HttpServletResponse.SC_UNAUTHORIZED); + } +} |