| /* |
| * Copyright 2003-2007 the original author or authors. |
| * |
| * 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 groovy.servlet; |
| |
| import groovy.lang.Binding; |
| import groovy.lang.Closure; |
| import groovy.util.GroovyScriptEngine; |
| import groovy.util.ResourceException; |
| import groovy.util.ScriptException; |
| |
| import java.io.IOException; |
| |
| import javax.servlet.ServletConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.codehaus.groovy.runtime.GroovyCategorySupport; |
| |
| /** |
| * This servlet will run Groovy scripts as Groovlets. Groovlets are scripts |
| * with these objects implicit in their scope: |
| * |
| * <ul> |
| * <li>request - the HttpServletRequest</li> |
| * <li>response - the HttpServletResponse</li> |
| * <li>application - the ServletContext associated with the servlet</li> |
| * <li>session - the HttpSession associated with the HttpServletRequest</li> |
| * <li>out - the PrintWriter associated with the ServletRequest</li> |
| * </ul> |
| * |
| * <p>Your script sources can be placed either in your web application's normal |
| * web root (allows for subdirectories) or in /WEB-INF/groovy/* (also allows |
| * subdirectories). |
| * |
| * <p>To make your web application more groovy, you must add the GroovyServlet |
| * to your application's web.xml configuration using any mapping you like, so |
| * long as it follows the pattern *.* (more on this below). Here is the |
| * web.xml entry: |
| * |
| * <pre> |
| * <servlet> |
| * <servlet-name>Groovy</servlet-name> |
| * <servlet-class>groovy.servlet.GroovyServlet</servlet-class> |
| * </servlet> |
| * |
| * <servlet-mapping> |
| * <servlet-name>Groovy</servlet-name> |
| * <url-pattern>*.groovy</url-pattern> |
| * <url-pattern>*.gdo</url-pattern> |
| * </servlet-mapping> |
| * </pre> |
| * |
| * <p>The URL pattern does not require the "*.groovy" mapping. You can, for |
| * example, make it more Struts-like but groovy by making your mapping "*.gdo". |
| * |
| * @author Sam Pullara |
| * @author Mark Turansky (markturansky at hotmail.com) |
| * @author Guillaume Laforge |
| * @author Christian Stein |
| * |
| * @see groovy.servlet.ServletBinding |
| */ |
| public class GroovyServlet extends AbstractHttpServlet { |
| |
| /** |
| * The script engine executing the Groovy scripts for this servlet |
| */ |
| private static GroovyScriptEngine gse; |
| |
| /** |
| * Initialize the GroovyServlet. |
| * |
| * @throws ServletException |
| * if this method encountered difficulties |
| */ |
| public void init(ServletConfig config) throws ServletException { |
| super.init(config); |
| |
| // Set up the scripting engine |
| gse = new GroovyScriptEngine(this); |
| |
| servletContext.log("Groovy servlet initialized on " + gse + "."); |
| } |
| |
| /** |
| * Handle web requests to the GroovyServlet |
| */ |
| public void service(HttpServletRequest request, HttpServletResponse response) throws IOException { |
| |
| // Get the script path from the request - include aware (GROOVY-815) |
| final String scriptUri = getScriptUri(request); |
| |
| // Set it to HTML by default |
| response.setContentType("text/html"); |
| |
| // Set up the script context |
| final Binding binding = new ServletBinding(request, response, servletContext); |
| |
| // Run the script |
| try { |
| Closure closure = new Closure(gse) { |
| |
| public Object call() { |
| try { |
| return ((GroovyScriptEngine) getDelegate()).run(scriptUri, binding); |
| } catch (ResourceException e) { |
| throw new RuntimeException(e); |
| } catch (ScriptException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| }; |
| GroovyCategorySupport.use(ServletCategory.class, closure); |
| /* |
| * Set reponse code 200. |
| */ |
| response.setStatus(HttpServletResponse.SC_OK); |
| } catch (RuntimeException runtimeException) { |
| StringBuffer error = new StringBuffer("GroovyServlet Error: "); |
| error.append(" script: '"); |
| error.append(scriptUri); |
| error.append("': "); |
| Throwable e = runtimeException.getCause(); |
| /* |
| * Null cause?! |
| */ |
| if (e == null) { |
| error.append(" Script processing failed."); |
| error.append(runtimeException.getMessage()); |
| error.append(runtimeException.getStackTrace()[0].toString()); |
| servletContext.log(error.toString()); |
| System.err.println(error.toString()); |
| runtimeException.printStackTrace(System.err); |
| response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, error.toString()); |
| return; |
| } |
| /* |
| * Resource not found. |
| */ |
| if (e instanceof ResourceException) { |
| error.append(" Script not found, sending 404."); |
| servletContext.log(error.toString()); |
| System.err.println(error.toString()); |
| response.sendError(HttpServletResponse.SC_NOT_FOUND); |
| return; |
| } |
| /* |
| * Other internal error. Perhaps syntax?! |
| */ |
| servletContext.log("An error occurred processing the request", runtimeException); |
| error.append(e.getMessage()); |
| error.append(e.getStackTrace()[0].toString()); |
| servletContext.log(e.toString()); |
| System.err.println(e.toString()); |
| runtimeException.printStackTrace(System.err); |
| response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e.toString()); |
| } finally { |
| /* |
| * Finally, flush the response buffer. |
| */ |
| response.flushBuffer(); |
| // servletContext.log("Flushed response buffer."); |
| } |
| } |
| |
| } |