make prototype exportsession (code in couchdbdao needs to be written)

src/main/java/de/thm/arsnova/controller/SessionController.java

@@ -17,6 +17,7 @@
  */
 package de.thm.arsnova.controller;
 
+import org.springframework.context.annotation.Import;
 import de.thm.arsnova.connector.model.Course;
 import de.thm.arsnova.entities.Session;
 import de.thm.arsnova.entities.SessionFeature;
@@ -268,6 +269,26 @@ public class SessionController extends PaginationController {
 		return sessionService.importSession(session);
 	}
 
+	@ApiOperation(value = "export sessions", nickname = "exportSession")
+	@RequestMapping(value = "/export", method = RequestMethod.GET)
+	public List<ImportExportSession> exportSession(
+			@ApiParam(value = "comma seperated list of sessionkeys", required = true) @PathVariable final String sessionkeys,
+			@ApiParam(value = "http servlet response", required = true) final HttpServletResponse response
+		) {
+		List<ImportExportSession> sessions = new ArrayList<ImportExportSession>();
+		ImportExportSession temp;
+		String[] splittedKeys = sessionkeys.split(",");
+		for (String key : splittedKeys) {
+			sessionService.setActive(key, false);
+			temp = sessionService.exportSession(key);
+			if (temp != null) {
+				sessions.add(temp);
+			}
+			sessionService.setActive(key, true);
+		}
+		return sessions;
+	}
+
 	@ApiOperation(value = "Locks or unlocks a Session",
 			nickname = "lockSession")
 	@ApiResponses(value = {

src/main/java/de/thm/arsnova/dao/CouchDBDao.java

@@ -2188,6 +2188,11 @@ public class CouchDBDao implements IDatabaseDao, ApplicationEventPublisherAware
 		return info;
 	}
 
+	@Override
+	public ImportExportQuestion exportSession(String sessionkey) {
+
+	}
+
 	@Override
 	public List<String> getSubjects(Session session, String questionVariant) {
 		String viewString = "";

src/main/java/de/thm/arsnova/dao/IDatabaseDao.java

@@ -205,6 +205,8 @@ public interface IDatabaseDao {
 
 	SessionInfo importSession(User user, ImportExportSession importSession);
 
+	ImportExportSession exportSession(String sessionkey);
+
 	Statistics getStatistics();
 
 	List<String> getSubjects(Session session, String questionVariant);

src/main/java/de/thm/arsnova/services/ISessionService.java

@@ -74,6 +74,8 @@ public interface ISessionService {
 
 	SessionInfo importSession(ImportExportSession session);
 
+	ImportExportSession exportSession(String sessionkey);
+
 	SessionFeature getSessionFeatures(String sessionkey);
 
 	SessionFeature changeSessionFeatures(String sessionkey, SessionFeature features);

src/main/java/de/thm/arsnova/services/SessionService.java

@@ -404,6 +404,12 @@ public class SessionService implements ISessionService, ApplicationEventPublishe
 		return info;
 	}
 
+	@Override
+	@PreAuthorize("isAuthenticated() and hasPermission(#sessionkey, 'session', 'owner')")
+	public ImportExportSession exportSession(String sessionkey) {
+		return databaseDao.exportSession(sessionkey);
+	}
+
 	@Override
 	public void setApplicationEventPublisher(ApplicationEventPublisher publisher) {
 		this.publisher = publisher;