Java tutorial
/** * Copyright (C) 2013, Moss Computing Inc. * * This file is part of bdbadmin. * * bdbadmin is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * bdbadmin is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with bdbadmin; see the file COPYING. If not, write to the * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301 USA. * * Linking this library statically or dynamically with other modules is * making a combined work based on this library. Thus, the terms and * conditions of the GNU General Public License cover the whole * combination. * * As a special exception, the copyright holders of this library give you * permission to link this library with independent modules to produce an * executable, regardless of the license terms of these independent * modules, and to copy and distribute the resulting executable under * terms of your choice, provided that you also meet, for each linked * independent module, the terms and conditions of the license of that * module. An independent module is a module which is not derived from * or based on this library. If you modify this library, you may extend * this exception to your version of the library, but you are not * obligated to do so. If you do not wish to do so, delete this * exception statement from your version. */ package com.moss.bdbadmin.openejb; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import javax.servlet.ServletException; import org.apache.commons.httpclient.HttpStatus; import org.apache.openejb.server.httpd.HttpListener; import org.apache.openejb.server.httpd.HttpRequest; import org.apache.openejb.server.httpd.HttpResponse; import com.moss.bdbadmin.api.util.AuthenticationHeader; import com.moss.bdbadmin.core.BdbCategory; import com.moss.bdbadmin.core.BdbDb; import com.moss.bdbadmin.core.BdbEntityResource; import com.moss.bdbadmin.core.BdbEnv; import com.moss.bdbadmin.core.BdbMapResource; import com.moss.bdbadmin.core.BdbService; import com.moss.bdbadmin.core.NotAuthorizedException; import com.moss.bdbadmin.core.ResourcePathException; import com.moss.bdbadmin.core.ServiceResource; import com.moss.bdbadmin.core.ServiceResourceVisitor; import com.moss.identity.IdProof; import com.moss.identity.tools.IdProovingException; public class BdbAdminOpenEjbAdapter implements HttpListener { private final String contextPath; private final BdbService service; public BdbAdminOpenEjbAdapter(String contextPath, BdbService service) { this.contextPath = contextPath; this.service = service; } public void onMessage(final HttpRequest request, final HttpResponse response) throws Exception { final IdProof assertion; { IdProof a = null; String value = request.getHeader(AuthenticationHeader.HEADER_NAME); if (value != null && value.length() > 0) { try { a = AuthenticationHeader.decode(value); } catch (Exception ex) { ex.printStackTrace(); a = null; } } else { System.out.println("No assertion included in request header"); a = null; } assertion = a; } final ServiceResource resource; { String path; if (request.getURI().getPath().length() >= contextPath.length()) { path = request.getURI().getPath().substring(contextPath.length()).trim(); } else { path = request.getURI().getPath(); } ServiceResource r = null; ; try { r = service.resolve(path); } catch (ResourcePathException ex) { ex.printStackTrace(); } resource = r; } if (assertion == null || resource == null) { response.setStatusCode(HttpStatus.SC_BAD_REQUEST); } else { abstract class Handler { abstract void handle() throws Exception; } Handler handler = resource.acceptVisitor(new ServiceResourceVisitor<Handler>() { public Handler visit(BdbMapResource map) { return new Handler() { public void handle() throws IdProovingException, NotAuthorizedException, IOException { if ("OPTIONS".equals(request.getMethod().name())) { byte[] data = service.map(assertion); response.setHeader("Content-Length", Integer.toString(data.length)); response.getOutputStream().write(data); response.setStatusCode(HttpStatus.SC_OK); } else { response.setStatusCode(HttpStatus.SC_METHOD_NOT_ALLOWED); } } }; } public Handler visit(BdbCategory category) { return null; } public Handler visit(BdbEnv env) { return null; } public Handler visit(final BdbDb db) { return new Handler() { public void handle() throws IdProovingException, NotAuthorizedException, IOException { if ("GET".equals(request.getMethod().name())) { byte[] data = service.dbInfo(assertion, db); response.setHeader("Content-Length", Integer.toString(data.length)); response.getOutputStream().write(data); response.setStatusCode(HttpStatus.SC_OK); } else if ("DELETE".equals(request.getMethod().name())) { service.clearDb(assertion, db); response.setStatusCode(HttpStatus.SC_OK); } else { response.setStatusCode(HttpStatus.SC_METHOD_NOT_ALLOWED); } } }; } public Handler visit(final BdbEntityResource entity) { return new Handler() { public void handle() throws IdProovingException, NotAuthorizedException, IOException { if ("OPTIONS".equals(request.getMethod().name())) { byte[] data = service.entryInfo(assertion, entity); if (data == null) { response.setStatusCode(HttpStatus.SC_NOT_FOUND); } else { response.setHeader("Content-Length", Integer.toString(data.length)); response.getOutputStream().write(data); response.setStatusCode(HttpStatus.SC_OK); } } else if ("GET".equals(request.getMethod().name())) { byte[] data = service.getEntry(assertion, entity); if (data == null) { response.setStatusCode(HttpStatus.SC_NOT_FOUND); } else { response.setHeader("Content-Length", Integer.toString(data.length)); response.getOutputStream().write(data); response.setStatusCode(HttpStatus.SC_OK); } } else if ("HEAD".equals(request.getMethod().name())) { byte[] data = service.getEntry(assertion, entity); if (data == null) { response.setStatusCode(HttpStatus.SC_NOT_FOUND); } else { response.setStatusCode(HttpStatus.SC_OK); } } else if ("PUT".equals(request.getMethod().name())) { byte[] input; { InputStream in = request.getInputStream(); ByteArrayOutputStream out = new ByteArrayOutputStream(); byte[] buffer = new byte[1023 * 10]; //10k buffer for (int numRead = in.read(buffer); numRead != -1; numRead = in.read(buffer)) { out.write(buffer, 0, numRead); } in.close(); out.close(); input = out.toByteArray(); } service.putEntry(assertion, entity, input); response.setStatusCode(HttpStatus.SC_OK); } else if ("DELETE".equals(request.getMethod().name())) { if (service.deleteEntry(assertion, entity)) { response.setStatusCode(HttpStatus.SC_OK); } else { response.setStatusCode(HttpStatus.SC_NOT_FOUND); } } else { response.setStatusCode(HttpStatus.SC_METHOD_NOT_ALLOWED); } } }; } }); if (handler == null) { System.out.println("Cannot perform any methods on requested path"); response.setStatusCode(HttpStatus.SC_METHOD_NOT_ALLOWED); } else { try { handler.handle(); } catch (IdProovingException ex) { ex.printStackTrace(); response.setStatusCode(HttpStatus.SC_BAD_REQUEST); } catch (NotAuthorizedException ex) { ex.printStackTrace(); response.setStatusCode(HttpStatus.SC_UNAUTHORIZED); } catch (Exception ex) { throw new ServletException(ex); } } } response.getOutputStream().close(); } }