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Diffstat (limited to 'sca-java-1.x/branches/sca-java-1.0.1/modules/binding-feed/src/main/java/org/apache/tuscany/sca/binding/feed/provider/FeedBindingListenerServlet.java')
| -rw-r--r-- | sca-java-1.x/branches/sca-java-1.0.1/modules/binding-feed/src/main/java/org/apache/tuscany/sca/binding/feed/provider/FeedBindingListenerServlet.java | 534 |
1 files changed, 534 insertions, 0 deletions
diff --git a/sca-java-1.x/branches/sca-java-1.0.1/modules/binding-feed/src/main/java/org/apache/tuscany/sca/binding/feed/provider/FeedBindingListenerServlet.java b/sca-java-1.x/branches/sca-java-1.0.1/modules/binding-feed/src/main/java/org/apache/tuscany/sca/binding/feed/provider/FeedBindingListenerServlet.java new file mode 100644 index 0000000000..dc4606fd45 --- /dev/null +++ b/sca-java-1.x/branches/sca-java-1.0.1/modules/binding-feed/src/main/java/org/apache/tuscany/sca/binding/feed/provider/FeedBindingListenerServlet.java @@ -0,0 +1,534 @@ +/* + * 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.feed.provider; + +import java.io.IOException; +import java.io.OutputStreamWriter; +import java.io.UnsupportedEncodingException; +import java.io.Writer; +import java.util.StringTokenizer; +import java.util.logging.Logger; + +import javax.servlet.ServletConfig; +import javax.servlet.ServletException; +import javax.servlet.http.HttpServlet; +import javax.servlet.http.HttpServletRequest; +import javax.servlet.http.HttpServletResponse; + +import org.apache.commons.codec.binary.Base64; +import org.apache.tuscany.sca.binding.feed.collection.NotFoundException; +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 org.jdom.Document; +import org.jdom.Element; +import org.jdom.JDOMException; +import org.jdom.Namespace; +import org.jdom.output.Format; +import org.jdom.output.XMLOutputter; + +import com.sun.syndication.feed.atom.Entry; +import com.sun.syndication.feed.atom.Feed; +import com.sun.syndication.feed.atom.Link; +import com.sun.syndication.feed.synd.SyndFeed; +import com.sun.syndication.feed.synd.SyndFeedImpl; +import com.sun.syndication.io.FeedException; +import com.sun.syndication.io.SyndFeedOutput; +import com.sun.syndication.io.WireFeedOutput; + +/** + * A resource collection binding listener, implemented as a servlet and + * registered in a servlet host provided by the SCA hosting runtime. + */ +class FeedBindingListenerServlet extends HttpServlet { + private static final Logger logger = Logger.getLogger(FeedBindingListenerServlet.class.getName()); + private static final long serialVersionUID = 1L; + + private final static Namespace APP_NS = Namespace.getNamespace("app", "http://purl.org/atom/app#"); + private final static Namespace ATOM_NS = Namespace.getNamespace("atom", "http://www.w3.org/2005/Atom"); + + private RuntimeWire wire; + private Invoker getFeedInvoker; + private Invoker getInvoker; + private Invoker postInvoker; + private Invoker postMediaInvoker; + private Invoker putInvoker; + private Invoker putMediaInvoker; + private Invoker deleteInvoker; + private MessageFactory messageFactory; + private String feedType; + + /** + * Constructs a new binding listener. + * + * @param wire + * @param messageFactory + * @param feedType + */ + FeedBindingListenerServlet(RuntimeWire wire, MessageFactory messageFactory, String feedType) { + this.wire = wire; + this.messageFactory = messageFactory; + this.feedType = feedType; + + // Get the invokers for the supported operations + for (InvocationChain invocationChain : this.wire.getInvocationChains()) { + String operationName = invocationChain.getSourceOperation().getName(); + if (operationName.equals("getFeed")) { + getFeedInvoker = invocationChain.getHeadInvoker(); + } else if (operationName.equals("get")) { + getInvoker = invocationChain.getHeadInvoker(); + } else if (operationName.equals("put")) { + putInvoker = invocationChain.getHeadInvoker(); + } else if (operationName.equals("putMedia")) { + putMediaInvoker = invocationChain.getHeadInvoker(); + } else if (operationName.equals("post")) { + postInvoker = invocationChain.getHeadInvoker(); + } else if (operationName.equals("postMedia")) { + postMediaInvoker = invocationChain.getHeadInvoker(); + } else if (operationName.equals("delete")) { + deleteInvoker = invocationChain.getHeadInvoker(); + } + } + } + + @Override + public void init(ServletConfig config) { + } + + @Override + protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + + // No authentication required for a get request + + // Get the request path + String path = request.getPathInfo(); + + // The feedType parameter is used to override what type of feed is going + // to + // be produced + String requestFeedType = request.getParameter("feedType"); + if (requestFeedType == null) + requestFeedType = feedType; + + logger.info(">>> FeedEndPointServlet (" + requestFeedType + ") " + request.getRequestURI()); + + // Handle an Atom request + if (requestFeedType.startsWith("atom_")) { + + if (path != null && path.equals("/atomsvc")) { + + // Return the Atom service document + response.setContentType("application/atomsvc+xml; charset=utf-8"); + Document document = new Document(); + Element service = new Element("service", APP_NS); + document.setRootElement(service); + + Element workspace = new Element("workspace", APP_NS); + Element title = new Element("title", ATOM_NS); + title.setText("resource"); + workspace.addContent(title); + service.addContent(workspace); + + Element collection = new Element("collection", APP_NS); + String href = request.getRequestURL().toString(); + href = href.substring(0, href.length() - "/atomsvc".length()); + collection.setAttribute("href", href); + Element collectionTitle = new Element("title", ATOM_NS); + collectionTitle.setText("entries"); + collection.addContent(collectionTitle); + workspace.addContent(collection); + + XMLOutputter outputter = new XMLOutputter(); + Format format = Format.getPrettyFormat(); + format.setEncoding("UTF-8"); + outputter.setFormat(format); + outputter.output(document, getWriter(response)); + + } else if (path == null || path.length() == 0 || path.equals("/")) { + + // Return a feed containing the entries in the collection + + // Get the Feed from the service implementation + Message requestMessage = messageFactory.createMessage(); + Message responseMessage = getFeedInvoker.invoke(requestMessage); + if (responseMessage.isFault()) { + throw new ServletException((Throwable)responseMessage.getBody()); + } + Feed feed = (Feed)responseMessage.getBody(); + if (feed != null) { + + // Write the Atom feed + response.setContentType("application/atom+xml; charset=utf-8"); + feed.setFeedType(requestFeedType); + WireFeedOutput feedOutput = new WireFeedOutput(); + try { + feedOutput.output(feed, getWriter(response)); + } catch (FeedException e) { + throw new ServletException(e); + } + } else { + response.sendError(HttpServletResponse.SC_NOT_FOUND); + } + } else if (path.startsWith("/")) { + + // Return a specific entry in the collection + + // Get the entry from the service implementation + Message requestMessage = messageFactory.createMessage(); + String id = path.substring(1); + requestMessage.setBody(new Object[] {id}); + Message responseMessage = getInvoker.invoke(requestMessage); + if (responseMessage.isFault()) { + throw new ServletException((Throwable)responseMessage.getBody()); + } + Entry entry = responseMessage.getBody(); + + // Write the Atom entry + if (entry != null) { + response.setContentType("application/atom+xml; charset=utf-8"); + try { + AtomEntryUtil.writeEntry(entry, feedType, getWriter(response)); + } catch (FeedException e) { + throw new ServletException(e); + } + } else { + response.sendError(HttpServletResponse.SC_NOT_FOUND); + } + + } else { + + // Path doesn't match any known pattern + response.sendError(HttpServletResponse.SC_NOT_FOUND); + } + } else { + + // Handle an RSS request + + if (path == null || path.length() == 0 || path.equals("/")) { + + // Get the Feed from the service + Message requestMessage = messageFactory.createMessage(); + Message responseMessage = getFeedInvoker.invoke(requestMessage); + if (responseMessage.isFault()) { + throw new ServletException((Throwable)responseMessage.getBody()); + } + Feed feed = (Feed)responseMessage.getBody(); + if (feed != null) { + + // Convert to an RSS feed + response.setContentType("application/rss+xml; charset=utf-8"); + feed.setFeedType("atom_1.0"); + SyndFeed syndFeed = new SyndFeedImpl(feed); + syndFeed.setFeedType(requestFeedType); + SyndFeedOutput syndOutput = new SyndFeedOutput(); + try { + syndOutput.output(syndFeed, getWriter(response)); + } catch (FeedException e) { + throw new ServletException(e); + } + } else { + response.sendError(HttpServletResponse.SC_NOT_FOUND); + } + } else { + response.sendError(HttpServletResponse.SC_NOT_FOUND); + } + } + } + + @Override + protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, + IOException { + + // Authenticate the user + String user = processAuthorizationHeader(request); + if (user == null) { + unauthorized(response); + return; + } + + // Get the request path + String path = request.getPathInfo(); + + if (path == null || path.length() == 0 || path.equals("/")) { + Entry createdEntry = null; + + // Create a new Atom entry + String contentType = request.getContentType(); + if (contentType.startsWith("application/atom+xml")) { + + // Read the entry from the request + Entry entry; + try { + entry = AtomEntryUtil.readEntry(feedType, request.getReader()); + } catch (JDOMException e) { + throw new ServletException(e); + } catch (FeedException e) { + throw new ServletException(e); + } + + // Let the component implementation create it + Message requestMessage = messageFactory.createMessage(); + requestMessage.setBody(new Object[] {entry}); + Message responseMessage = postInvoker.invoke(requestMessage); + if (responseMessage.isFault()) { + throw new ServletException((Throwable)responseMessage.getBody()); + } + createdEntry = responseMessage.getBody(); + + } else if (contentType != null) { + + // Create a new media entry + + // Get incoming headers + String title = request.getHeader("Title"); + String slug = request.getHeader("Slug"); + + // Let the component implementation create the media entry + Message requestMessage = messageFactory.createMessage(); + requestMessage.setBody(new Object[] {title, slug, contentType, request.getInputStream()}); + Message responseMessage = postMediaInvoker.invoke(requestMessage); + if (responseMessage.isFault()) { + throw new ServletException((Throwable)responseMessage.getBody()); + } + createdEntry = responseMessage.getBody(); + } else { + response.sendError(HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE); + } + + // A new entry was created successfully + if (createdEntry != null) { + + // Set location of the created entry in the Location header + for (Object l : createdEntry.getOtherLinks()) { + Link link = (Link)l; + if (link.getRel() == null || "edit".equals(link.getRel())) { + response.addHeader("Location", link.getHref()); + break; + } + } + + // Write the created Atom entry + response.setStatus(HttpServletResponse.SC_CREATED); + response.setContentType("application/atom+xml; charset=utf-8"); + try { + AtomEntryUtil.writeEntry(createdEntry, feedType, getWriter(response)); + } catch (FeedException e) { + throw new ServletException(e); + } + + } else { + response.sendError(HttpServletResponse.SC_NOT_FOUND); + } + + } else { + response.sendError(HttpServletResponse.SC_NOT_FOUND); + } + } + + private Writer getWriter(HttpServletResponse response) throws UnsupportedEncodingException, IOException { + Writer writer = new OutputStreamWriter(response.getOutputStream(), "UTF-8"); + return writer; + } + + @Override + protected void doPut(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + + // Authenticate the user + String user = processAuthorizationHeader(request); + if (user == null) { + unauthorized(response); + return; + } + + // Get the request path + String path = request.getPathInfo(); + + if (path != null && path.startsWith("/")) { + String id = path.substring(1); + Entry updatedEntry = null; + + // Update an Atom entry + String contentType = request.getContentType(); + if (contentType.startsWith("application/atom+xml")) { + + // Read the entry from the request + Entry entry; + try { + entry = AtomEntryUtil.readEntry(feedType, request.getReader()); + } catch (JDOMException e) { + throw new ServletException(e); + } catch (FeedException e) { + throw new ServletException(e); + } + + // Let the component implementation create it + Message requestMessage = messageFactory.createMessage(); + requestMessage.setBody(new Object[] {id, entry}); + Message responseMessage = putInvoker.invoke(requestMessage); + if (responseMessage.isFault()) { + Object body = responseMessage.getBody(); + if (body instanceof NotFoundException) { + response.sendError(HttpServletResponse.SC_NOT_FOUND); + } else { + throw new ServletException((Throwable)responseMessage.getBody()); + } + } else { + updatedEntry = responseMessage.getBody(); + } + + } else if (contentType != null) { + + // Updated a media entry + + // Let the component implementation create the media entry + Message requestMessage = messageFactory.createMessage(); + requestMessage.setBody(new Object[] {id, contentType, request.getInputStream()}); + Message responseMessage = putMediaInvoker.invoke(requestMessage); + Object body = responseMessage.getBody(); + if (body instanceof NotFoundException) { + if (body instanceof NotFoundException) { + response.sendError(HttpServletResponse.SC_NOT_FOUND); + } else { + throw new ServletException((Throwable)responseMessage.getBody()); + } + } else { + updatedEntry = (Entry) body; + } + + } else { + response.sendError(HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE); + } + + // The entry was successfully updated + if (updatedEntry != null) { + + // Write the updated Atom entry + response.setContentType("application/atom+xml; charset=utf-8"); + try { + AtomEntryUtil.writeEntry(updatedEntry, feedType, getWriter(response)); + } catch (FeedException e) { + throw new ServletException(e); + } + + } else { + response.sendError(HttpServletResponse.SC_NOT_FOUND); + } + + } else { + response.sendError(HttpServletResponse.SC_NOT_FOUND); + } + } + + @Override + protected void doDelete(HttpServletRequest request, HttpServletResponse response) throws ServletException, + IOException { + + // Authenticate the user + String user = processAuthorizationHeader(request); + if (user == null) { + unauthorized(response); + return; + } + + // Get the request path + String path = request.getPathInfo(); + + String id; + if (path != null && path.startsWith("/")) { + id = path.substring(1); + } else { + id = ""; + } + + // Delete a specific entry from the collection + Message requestMessage = messageFactory.createMessage(); + requestMessage.setBody(new Object[] {id}); + Message responseMessage = deleteInvoker.invoke(requestMessage); + if (responseMessage.isFault()) { + Object body = responseMessage.getBody(); + if (body instanceof NotFoundException) { + response.sendError(HttpServletResponse.SC_NOT_FOUND); + } else { + throw new ServletException((Throwable)responseMessage.getBody()); + } + } + } + + /** + * 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); + } +} |