Java tutorial
/******************************************************************************* * Copyright (c) 2015 The Board of Trustees of the Leland Stanford Junior University * BY CLICKING ON "ACCEPT," DOWNLOADING, OR OTHERWISE USING EPAD, YOU AGREE TO THE FOLLOWING TERMS AND CONDITIONS: * STANFORD ACADEMIC SOFTWARE SOURCE CODE LICENSE FOR * "ePAD Annotation Platform for Radiology Images" * * This Agreement covers contributions to and downloads from the ePAD project ("ePAD") maintained by The Board of Trustees * of the Leland Stanford Junior University ("Stanford"). * * * Part A applies to downloads of ePAD source code and/or data from ePAD. * * * Part B applies to contributions of software and/or data to ePAD (including making revisions of or additions to code * and/or data already in ePAD), which may include source or object code. * * Your download, copying, modifying, displaying, distributing or use of any ePAD software and/or data from ePAD * (collectively, the "Software") is subject to Part A. 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(By way * of non-limiting example, you will not contribute any code obtained by you under the GNU General Public License or other * so-called "reciprocal" license.) *******************************************************************************/ package edu.stanford.epad.epadws.handlers.dicom; import java.io.IOException; import java.net.URLDecoder; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.httpclient.HttpException; import org.eclipse.jetty.server.Request; import org.eclipse.jetty.server.handler.AbstractHandler; import edu.stanford.epad.common.util.EPADConfig; import edu.stanford.epad.common.util.EPADLogger; import edu.stanford.epad.epadws.handlers.HandlerUtil; import edu.stanford.epad.epadws.security.EPADSessionOperations; import edu.stanford.epad.epadws.service.SessionService; /** * WADO Handler */ public class WadoHandler extends AbstractHandler { private static final EPADLogger log = EPADLogger.getInstance(); private static final String INTERNAL_EXCEPTION_MESSAGE = "Internal error in WADO route"; private static final String MISSING_QUERY_MESSAGE = "No query in WADO request"; private static final String INVALID_METHOD = "Only GET methods valid for the WADO route"; private static final String INVALID_SESSION_TOKEN_MESSAGE = "Session token is invalid on WADO route"; @Override public void handle(String s, Request request, HttpServletRequest httpRequest, HttpServletResponse httpResponse) { ServletOutputStream responseStream = null; String origin = httpRequest.getHeader("Origin"); // CORS request should have Origin header int statusCode; // Origin header indicates a possible CORS requests if (origin != null) { httpResponse.setHeader("Access-Control-Allow-Origin", origin); httpResponse.setHeader("Access-Control-Allow-Credentials", "true"); // Needed to allow cookies } else { httpResponse.setHeader("Access-Control-Allow-Origin", "*"); } if (httpRequest.getQueryString().indexOf("dicom") != -1) httpResponse.setContentType("application/octet-stream"); else httpResponse.setContentType("image/jpeg"); if (request != null) // In case handler is not called thru jetty request.setHandled(true); String method = httpRequest.getMethod(); if ("GET".equalsIgnoreCase(method)) { try { String sessionID = SessionService.getJSessionIDFromRequest(httpRequest); if (sessionID == null || sessionID.length() == 0) { log.warning("JSESSIONID is Missing in client request"); //statusCode = HandlerUtil.invalidTokenJSONResponse(INVALID_SESSION_TOKEN_MESSAGE, httpResponse.getWriter(), log); } String username = httpRequest.getParameter("username"); responseStream = httpResponse.getOutputStream(); // if (XNATOperations.hasValidXNATSessionID(httpRequest)) { if (dummy()) { // TODO Re-enable authentication String queryString = httpRequest.getQueryString(); queryString = URLDecoder.decode(queryString, "UTF-8"); if (queryString != null) { statusCode = performWADOQuery(queryString, responseStream, username, sessionID); } else { statusCode = HandlerUtil.badRequestResponse(MISSING_QUERY_MESSAGE, log); log.warning("Missing Wado query"); } } else { statusCode = HandlerUtil.invalidTokenResponse(INVALID_SESSION_TOKEN_MESSAGE, log); } //} } catch (Throwable t) { statusCode = HandlerUtil.internalErrorResponse(INTERNAL_EXCEPTION_MESSAGE, log); log.warning("Error is Wado query", t); } } else { httpResponse.setHeader("Access-Control-Allow-Methods", "GET"); statusCode = HandlerUtil.warningResponse(HttpServletResponse.SC_METHOD_NOT_ALLOWED, INVALID_METHOD, log); } httpResponse.setStatus(statusCode); } private boolean dummy() { return true; } private int performWADOQuery(String queryString, ServletOutputStream outputStream, String username, String sessionID) { String wadoHost = EPADConfig.dcm4CheeServer; int wadoPort = EPADConfig.dcm4cheeServerWadoPort; String wadoBase = EPADConfig.wadoURLExtension; if (queryString.toLowerCase().indexOf("dicom") != -1) { log.info("User:" + username + " host:" + EPADSessionOperations.getSessionHost(sessionID) + " Wado Request to download dicom:" + queryString); } String wadoURL = buildWADOURL(wadoHost, wadoPort, wadoBase, queryString); int statusCode; try { statusCode = HandlerUtil.streamGetResponse(wadoURL, outputStream, log); if (statusCode != HttpServletResponse.SC_OK) log.warning("Unexpected response " + statusCode + " to WADO request " + wadoURL); } catch (HttpException e) { statusCode = HandlerUtil.internalErrorResponse(INTERNAL_EXCEPTION_MESSAGE, log); } catch (IOException e) { statusCode = HandlerUtil.internalErrorResponse(INTERNAL_EXCEPTION_MESSAGE, log); } return statusCode; } private String buildWADOURL(String host, int port, String base, String queryString) { StringBuilder sb = new StringBuilder(); sb.append("http://").append(host); sb.append(":").append(port); sb.append(base); sb.append(queryString); return sb.toString(); } }