Added userDAO

Check for unique logins

server/build.gradle

@@ -18,18 +18,12 @@ dependencies {
 	runtimeOnly 'mysql:mysql-connector-java'
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 
-	// Spring security
-	//implementation 'org.springframework.boot:spring-boot-starter-security'
-	//implementation 'org.springframework.security:spring-security-test'
-
 	// JSON web token
 	implementation 'io.jsonwebtoken:jjwt-api:0.11.2'
 	runtimeOnly 'io.jsonwebtoken:jjwt-impl:0.11.2',
-			// Uncomment the next line if you want to use RSASSA-PSS (PS256, PS384, PS512) algorithms:
-			//'org.bouncycastle:bcprov-jdk15on:1.60',
-			'io.jsonwebtoken:jjwt-jackson:0.11.2' // or 'io.jsonwebtoken:jjwt-gson:0.11.2' for gson
+			'io.jsonwebtoken:jjwt-jackson:0.11.2'
 }
 
 test {
 	useJUnitPlatform()
-}
+}

server/src/main/java/com/vpr/server/controller/AuthController.java

@@ -0,0 +1,18 @@
+package com.vpr.server.controller;
+
+import com.vpr.server.data.User;
+import com.vpr.server.repository.UserRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+public class AuthController {
+
+    public User getAuthUserFromHeader(String authorizationHeader, UserRepository userRepository){
+        String[] splitAuthHeader = authorizationHeader.split("\\s");
+        if(splitAuthHeader.length == 2){
+            return userRepository.findByToken(splitAuthHeader[1]);
+        }
+        return null;
+    }
+}

server/src/main/java/com/vpr/server/controller/EventController.java

@@ -3,20 +3,19 @@ package com.vpr.server.controller;
 import com.vpr.server.data.Event;
 import com.vpr.server.data.User;
 import com.vpr.server.data.UserEvent;
+import com.vpr.server.dao.interfaces.EventDAO;
+import com.vpr.server.json.JSONMapper;
+import com.vpr.server.json.Validator;
 import com.vpr.server.repository.EventRepository;
 import com.vpr.server.repository.UserEventRepository;
 import com.vpr.server.repository.UserRepository;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Controller;
-import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RequestParam;
-import org.springframework.web.bind.annotation.ResponseBody;
-import org.springframework.web.server.ResponseStatusException;
+import org.springframework.web.bind.annotation.*;
 
-import java.sql.Time;
-import java.text.SimpleDateFormat;
+import java.util.List;
 
 @Controller
 @RequestMapping(path = "/event")
@@ -28,90 +27,144 @@ public class EventController {
     @Autowired
     private UserEventRepository userEventRepository;
 
+    @Autowired
+    private EventDAO eventDAO;
+
     /******************
      * POST-ENDPOINTS *
      ******************/
 
     @PostMapping(path = "/add")
     public @ResponseBody
-    String addEvent(
-            @RequestParam Integer userId,
+    ResponseEntity<String> addEvent(
+            @RequestHeader("Authorization") String authorizationHeader,
+            @RequestParam long userId,
             @RequestParam String date,
             @RequestParam String name,
             @RequestParam String start,
             @RequestParam String end,
-            @RequestParam Integer prority,
+            @RequestParam Integer priority,
             @RequestParam Boolean isFullDay,
             @RequestParam Boolean isPrivate
     ) {
-        String errorString = "";
-
-        Event event = new Event();
-
-        System.out.println(name.length() + ". name " + name);
-        if (name.length() > 3) {
-            event.setName(name);
-        } else {
-            System.out.println("NAME IST ZU KURZ");
-            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Format nicht korrekt");
+        User authUser = userRepository.findByToken(authorizationHeader.split("\\s")[1]);
+        if (authUser == null || (!authUser.isAdmin() && authUser.getId() != userId)) {
+            return new ResponseEntity<>("Du hast keine Rechte um den Termin zu erstellen", HttpStatus.UNAUTHORIZED);
         }
 
-        try {
-            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("hh:mm");
-            long ms = simpleDateFormat.parse(start).getTime();
-            event.setStart(new Time(ms));
-        } catch (Exception e) {
-            event.setStart(null);
-        }
+        ResponseEntity<String> BAD_REQUEST = createEventAndUserEvent(userId, date, name, start, end, priority, isFullDay, isPrivate);
+        if (BAD_REQUEST != null) return BAD_REQUEST;
 
-        try {
-            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("hh:mm");
-            long ms = simpleDateFormat.parse(end).getTime();
-            event.setEnd(new Time(ms));
-        } catch (Exception e) {
-            event.setEnd(null);
-        }
-
-        event.setPriority(prority);
-        event.setFullDay(isFullDay);
-        event.setPrivate(isPrivate);
-
-        UserEvent userEvent = new UserEvent();
-
-        try {
-            System.out.println("date " + date);
-            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
-            userEvent.setDate(new java.sql.Date(simpleDateFormat.parse(date).getTime()));
-        } catch (Exception e) {
-            System.out.println("DATE FORMAT NOT CORRECT");
-            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Format nicht korrekt");
-        }
-
-        userEvent.setEvent(event);
-        long uId = Long.valueOf(userId);
-        User user = userRepository.findById(uId);
-        userEvent.setUser(user);
-
-        System.out.println(userEvent);
-        System.out.println(user);
-
-        eventRepository.save(event);
-        userEventRepository.save(userEvent);
-        return "";
+        return new ResponseEntity<>("", HttpStatus.OK);
     }
 
     @PostMapping(path = "/del")
     public @ResponseBody
-    String addEvent(@RequestParam Integer eventId) {
-        eventRepository.deleteUserEventsById(Long.valueOf(eventId));
-        eventRepository.deleteById(Long.valueOf(eventId));
-        return "Deleted";
+    ResponseEntity<String> delEvent(
+            @RequestHeader("Authorization") String authorizationHeader,
+            @RequestParam long eventId,
+            @RequestParam long userId,
+            @RequestParam String date
+    ) {
+        User authUser = userRepository.findByToken(authorizationHeader.split("\\s")[1]);
+        if (authUser == null || (!authUser.isAdmin() && authUser.getId() != userId)) {
+            return new ResponseEntity<>("Du hast keine Rechte um den Termin zu löschen", HttpStatus.UNAUTHORIZED);
+        }
+
+        eventRepository.deleteUserEventsById(userId, eventId, date);
+        if(eventDAO.getAllEventsWithId(eventId).size() == 0){
+            eventRepository.deleteById(eventId);
+        }
+
+        return new ResponseEntity<>("", HttpStatus.OK);
     }
 
+
     @PostMapping(path = "/all")
     public @ResponseBody
-    Object[] getAllEvents(@RequestParam long userId) {
-        return eventRepository.findAllVisibleByUserId(userId);
+    ResponseEntity<String> getAllEvents(
+            @RequestHeader("Authorization") String authorizationHeader,
+            @RequestParam String startDate,
+            @RequestParam String endDate
+    ) {
+        User authUser = userRepository.findByToken(authorizationHeader.split("\\s")[1]);
+        if (authUser == null) {
+            return new ResponseEntity<>("Bitte erneut einloggen", HttpStatus.UNAUTHORIZED);
+        }
+
+        List<Event> eventList = eventDAO.getAllEventsInTimespan(authUser.getId(), startDate, endDate);
+
+        return new ResponseEntity<>(JSONMapper.eventListToJSON(eventList), HttpStatus.OK);
     }
 
+
+    @PostMapping(path = "/edit")
+    public @ResponseBody
+    ResponseEntity<String> editEvent(
+            @RequestHeader("Authorization") String authorizationHeader,
+            @RequestParam Long eventId,
+            @RequestParam Long userId,
+            @RequestParam String date,
+            @RequestParam String newDate,
+            @RequestParam String newName,
+            @RequestParam String newStart,
+            @RequestParam String newEnd,
+            @RequestParam Integer newPriority,
+            @RequestParam Boolean newIsFullDay,
+            @RequestParam Boolean newIsPrivate
+    ) {
+        User authUser = userRepository.findByToken(authorizationHeader.split("\\s")[1]);
+        if (authUser == null || (!authUser.isAdmin() && authUser.getId() != userId)) {
+            return new ResponseEntity<>("Du hast keine Rechte um den Termin zu bearbeiten", HttpStatus.UNAUTHORIZED);
+        }
+
+        List<Event> eventList = eventDAO.getAllEventsWithIdAndDate(userId, eventId, date);
+
+        if (eventList == null || eventList.size() == 0) {
+            return new ResponseEntity<>("Der Termin exestiert nicht in der Datenbank", HttpStatus.BAD_REQUEST);
+        }
+        if (eventList.size() > 1) {
+            return new ResponseEntity<>("Drr Termin ist doppelt vorhanden. (Um das zu lösen versuche den Termin zu löschen und erneut zu erstellen)", HttpStatus.BAD_REQUEST);
+        }
+
+        eventRepository.deleteUserEventsById(userId, eventId, date);
+        if(eventDAO.getAllEventsWithId(eventId).size() == 0){
+            eventRepository.deleteById(eventId);
+        }
+
+        ResponseEntity<String> BAD_REQUEST = createEventAndUserEvent(userId, newDate, newName, newStart, newEnd, newPriority, newIsFullDay, newIsPrivate);
+        if (BAD_REQUEST != null) return BAD_REQUEST;
+
+        return new ResponseEntity<>("", HttpStatus.OK);
+    }
+
+    private ResponseEntity<String> createEventAndUserEvent(long userId, String date, String name, String start, String end, Integer priority, Boolean isFullDay, Boolean isPrivate) {
+        User user = userRepository.findById(userId);
+        if(user == null){
+            return new ResponseEntity<>("UserId nicht korrekt", HttpStatus.BAD_REQUEST);
+        }
+
+        try {
+            Event event = new Event();
+
+            event.setName(Validator.ValidateEventName(name));
+            event.setStart(Validator.ValidateEventTime(start));
+            event.setEnd(Validator.ValidateEventTime(end));
+            event.setPriority(priority);
+            event.setFullDay(isFullDay);
+            event.setPrivate(isPrivate);
+
+            UserEvent userEvent = new UserEvent();
+
+            userEvent.setDate(Validator.ValidateEventDate(date));
+            userEvent.setEvent(event);
+            userEvent.setUser(user);
+
+            eventRepository.save(event);
+            userEventRepository.save(userEvent);
+        }catch (IllegalArgumentException exception){
+            return new ResponseEntity<>(exception.getMessage(), HttpStatus.BAD_REQUEST);
+        }
+        return null;
+    }
 }

server/src/main/java/com/vpr/server/controller/MainController.java

@@ -33,4 +33,10 @@ public class MainController {
     public String statusTest(){
         throw new ResponseStatusException(HttpStatus.I_AM_A_TEAPOT, "TestTestTest");
     }
+
+    @PostMapping(path = "/header-test")
+    public ResponseEntity<String> headerTest(@RequestHeader("Authorization") String authorizationHeader){
+        System.out.println("authorizationHeader: " + authorizationHeader);
+        return new ResponseEntity<>(authorizationHeader, HttpStatus.OK);
+    }
 }

server/src/main/java/com/vpr/server/controller/UserController.java

@@ -1,24 +1,36 @@
 package com.vpr.server.controller;
 
+import com.vpr.server.dao.interfaces.UserDAO;
+import com.vpr.server.data.Event;
 import com.vpr.server.data.User;
+import com.vpr.server.json.JSONMapper;
 import com.vpr.server.repository.UserRepository;
 import com.vpr.server.security.Hasher;
 import com.vpr.server.security.Token;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.*;
-import org.springframework.web.server.ResponseStatusException;
 
 import java.security.NoSuchAlgorithmException;
 import java.security.spec.InvalidKeySpecException;
 import java.util.Arrays;
+import java.util.List;
 
 @Controller
 @RequestMapping(path = "/user")
 public class UserController {
     @Autowired
     private UserRepository userRepository;
+    @Autowired
+    private UserDAO userDAO;
+
+    private final AuthController authController;
+
+    public UserController() {
+        this.authController = new AuthController();
+    }
 
     /******************
      * POST-ENDPOINTS *
@@ -26,47 +38,57 @@ public class UserController {
 
     @PostMapping(path = "/add")
     public @ResponseBody
-    String addNewUser(
+    ResponseEntity<String> addNewUser(
+            @RequestHeader("Authorization") String authorizationHeader,
             @RequestParam String name,
             @RequestParam String forename,
             @RequestParam String login,
             @RequestParam String password,
-            @RequestParam String isAdmin
+            @RequestParam Boolean isAdmin
     ) {
+        User authUser = authController.getAuthUserFromHeader(authorizationHeader, userRepository);
+        if(authUser == null || !authUser.isAdmin()){
+            return new ResponseEntity<>( "Du hast keine Rechte um einen User an zu legen", HttpStatus.UNAUTHORIZED);
+        }
+
+        if(userRepository.findByLogin(login) != null){
+            return new ResponseEntity<>( "Login exestiert bereits", HttpStatus.BAD_REQUEST);
+        }
+
         byte[] salt = Hasher.GenerateSalt();
         byte[] hash;
         try {
             hash = Hasher.HashPassword(password, salt);
         } catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
             e.printStackTrace();
-            throw new ResponseStatusException(HttpStatus.INTERNAL_SERVER_ERROR, "Fehler beim hashen");
+            return new ResponseEntity<>( "Fehler beim hashen", HttpStatus.INTERNAL_SERVER_ERROR);
         }
 
         User user = new User();
 
-        // TODO set correct token and password
         user.setName(name);
         user.setForename(forename);
         user.setLogin(login);
         user.setPassword(hash);
         user.setSalt(salt);
-        user.setToken("test");
-        user.setAdmin(isAdmin.equals("1"));
+        user.setToken("");
+        user.setAdmin(isAdmin);
 
         userRepository.save(user);
-        return "" + user.getId();
+        return new ResponseEntity<>( "" + user.getId(), HttpStatus.OK);
     }
 
     @PostMapping(path = "/login")
     public @ResponseBody
-    String login(
+    ResponseEntity<String> login(
             @RequestParam String login,
             @RequestParam String password
     ) {
-        System.out.println("LOGIN");
+        System.out.println(login + " tries to login.");
         User user = userRepository.findByLogin(login);
         if (user == null) {
-            throw new ResponseStatusException(HttpStatus.UNAUTHORIZED, "Falscher login");
+            System.out.println("Login for " + login + " failed.");
+            return new ResponseEntity<>( "Falscher login", HttpStatus.UNAUTHORIZED);
         }
 
         byte[] salt = user.getSalt();
@@ -75,26 +97,52 @@ public class UserController {
             hash = Hasher.HashPassword(password, salt);
         } catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
             e.printStackTrace();
-            throw new ResponseStatusException(HttpStatus.INTERNAL_SERVER_ERROR, "Fehler beim hashen");
+            return new ResponseEntity<>( "Fehler beim hashen", HttpStatus.INTERNAL_SERVER_ERROR);
         }
 
         if (Arrays.equals(user.getPassword(), hash)) {
+            String token = Token.Generate(user.getLogin());
+            user.setToken(token);
+            userRepository.save(user);
+
             System.out.println(user.getLogin() + " is now logged in.");
-            System.out.println(Token.Generate(user.getLogin()));
             System.out.println(Token.Verify(Token.Generate(user.getLogin()), user.getLogin()));
-            return "" + user.getId();
+
+            return new ResponseEntity<>( token + " " + user.getId(), HttpStatus.OK);
         }
         System.out.println(user.getLogin() + " failed to logged in.");
         System.out.println("entered : " + javax.xml.bind.DatatypeConverter.printHexBinary(hash));
         System.out.println("required: " + javax.xml.bind.DatatypeConverter.printHexBinary(user.getPassword()));
 
-        throw new ResponseStatusException(HttpStatus.UNAUTHORIZED, "Falscher login");
+        return new ResponseEntity<>( "Falscher login", HttpStatus.UNAUTHORIZED);
+    }
+
+    @PostMapping(path = "/login-with-token")
+    public @ResponseBody ResponseEntity<String> loginWithToken(
+            @RequestHeader("Authorization") String authorizationHeader,
+            @RequestParam long userId
+    ){
+        User authUser = authController.getAuthUserFromHeader(authorizationHeader, userRepository);
+        if(authUser == null || authUser.getId() != userId){
+            return new ResponseEntity<>( "Falscher auth-token", HttpStatus.UNAUTHORIZED);
+        }
+        return new ResponseEntity<>("", HttpStatus.OK);
     }
 
     @PostMapping(path = "/del")
-    public @ResponseBody String deleteUser(@RequestParam Integer userId) {
-        userRepository.deleteById(Long.valueOf(userId));
-        return "Deleted";
+    public @ResponseBody ResponseEntity<String> deleteUser(
+            @RequestHeader("Authorization") String authorizationHeader,
+            @RequestParam long userId
+    ) {
+        User authUser = authController.getAuthUserFromHeader(authorizationHeader, userRepository);
+        if(authUser == null || !authUser.isAdmin()){
+            return new ResponseEntity<>( "Du hast keine Rechte um den Termin zu löschen", HttpStatus.UNAUTHORIZED);
+        }
+        User user = userRepository.findById(userId);
+        if(user == null){
+            return new ResponseEntity<>( "User nicht in der Datenbank vorhanden", HttpStatus.BAD_REQUEST);
+        }
+        return new ResponseEntity<>( "", HttpStatus.OK);
     }
 
     /*****************
@@ -103,7 +151,9 @@ public class UserController {
 
     @GetMapping(path = "/all")
     public @ResponseBody
-    Object[] getAllUsers() {
-        return userRepository.findAllUsernames();
+    ResponseEntity<String> getAllUser() {
+        List<User> userList = userDAO.getAllUser();
+
+        return new ResponseEntity<>(JSONMapper.userListToJSON(userList), HttpStatus.OK);
     }
 }

server/src/main/java/com/vpr/server/dao/implementation/EventDAOImplementation.java

@@ -0,0 +1,48 @@
+package com.vpr.server.dao.implementation;
+
+import com.vpr.server.dao.interfaces.EventDAO;
+import com.vpr.server.data.Event;
+import org.springframework.stereotype.Repository;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.transaction.Transactional;
+import java.util.List;
+
+@Repository
+@Transactional
+public class EventDAOImplementation implements EventDAO {
+
+    @PersistenceContext
+    private EntityManager manager;
+
+    @Override
+    public List<Event> getAllEvents() {
+        return manager.createNamedQuery("getAllEvents", Event.class).getResultList();
+    }
+
+    @Override
+    public List<Event> getAllEventsWithId(long eventId) {
+        return manager.createNamedQuery("getAllEventsWithId", Event.class)
+                .setParameter("eventId", eventId)
+                .getResultList();
+    }
+
+    @Override
+    public List<Event> getAllEventsInTimespan(long userId, String startDate, String endDate) {
+        return manager.createNamedQuery("getAllEventsInTimespan", Event.class)
+                .setParameter("userId", userId)
+                .setParameter("startDate", startDate)
+                .setParameter("endDate", endDate)
+                .getResultList();
+    }
+
+    @Override
+    public List<Event> getAllEventsWithIdAndDate(long userId, long eventId, String date) {
+        return manager.createNamedQuery("getAllEventsWithIdAndDate", Event.class)
+                .setParameter("userId", userId)
+                .setParameter("eventId", eventId)
+                .setParameter("date", date)
+                .getResultList();
+    }
+}

server/src/main/java/com/vpr/server/dao/implementation/UserDAOImplementation.java

@@ -0,0 +1,24 @@
+package com.vpr.server.dao.implementation;
+
+import com.vpr.server.dao.interfaces.UserDAO;
+import com.vpr.server.data.Event;
+import com.vpr.server.data.User;
+import org.springframework.stereotype.Repository;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.transaction.Transactional;
+import java.util.List;
+
+@Repository
+@Transactional
+public class UserDAOImplementation implements UserDAO {
+
+    @PersistenceContext
+    private EntityManager manager;
+
+    @Override
+    public List<User> getAllUser() {
+        return manager.createNamedQuery("getAllUser", User.class).getResultList();
+    }
+}

server/src/main/java/com/vpr/server/dao/interfaces/EventDAO.java

@@ -0,0 +1,16 @@
+package com.vpr.server.dao.interfaces;
+
+import com.vpr.server.data.Event;
+
+import java.util.List;
+
+public interface EventDAO {
+
+    List<Event> getAllEvents();
+
+    List<Event> getAllEventsInTimespan(long userId, String startDate, String endDate);
+
+    List<Event> getAllEventsWithIdAndDate(long userId, long eventId, String date);
+
+    List<Event> getAllEventsWithId(long eventId);
+}

server/src/main/java/com/vpr/server/dao/interfaces/UserDAO.java

@@ -0,0 +1,9 @@
+package com.vpr.server.dao.interfaces;
+
+import com.vpr.server.data.User;
+
+import java.util.List;
+
+public interface UserDAO {
+    List<User> getAllUser();
+}

server/src/main/java/com/vpr/server/data/Event.java

@@ -1,33 +1,73 @@
 package com.vpr.server.data;
 
 import javax.persistence.*;
+import java.io.Serializable;
 import java.sql.Time;
 import java.util.List;
 
-// @Entity creates a table out of this class with Hibernate
-@Entity(name = "Event")
-public class Event {
+@Entity(name = "Event") // @Entity creates a table out of this class with Hibernate
+@Table(name = "event")
+@NamedNativeQueries({
+    @NamedNativeQuery(
+        name = "getAllEvents",
+        query = "SELECT * FROM event",
+        resultClass = Event.class
+    ),
+    @NamedNativeQuery(
+            name = "getAllEventsInTimespan",
+            query = "SELECT * " +
+                    "FROM event e " +
+                    "INNER JOIN user_event ue " +
+                    "ON e.id = ue.event_id " +
+                    "WHERE (ue.user_id = :userId OR e.is_private = 0) " +
+                    "AND ue.date >= :startDate " +
+                    "AND ue.date < :endDate " +
+                    "ORDER BY ue.date, e.priority DESC, e.start",
+            resultClass = Event.class
+    ),
+    @NamedNativeQuery(
+            name = "getAllEventsWithIdAndDate",
+            query = "SELECT * " +
+                    "FROM event e " +
+                    "INNER JOIN user_event ue " +
+                    "ON e.id = ue.event_id " +
+                    "WHERE ue.user_id = :userId " +
+                    "AND ue.event_id = :eventId " +
+                    "AND ue.date = :date",
+            resultClass = Event.class
+    ),
+    @NamedNativeQuery(
+            name = "getAllEventsWithId",
+            query = "SELECT * " +
+                    "FROM event e " +
+                    "INNER JOIN user_event ue " +
+                    "ON e.id = ue.event_id " +
+                    "WHERE ue.event_id = :eventId",
+            resultClass = Event.class
+    )
+})
+public class Event implements Serializable {
     // Generate the primary key
     @Id
-    @GeneratedValue(strategy=GenerationType.IDENTITY)
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private long id;
 
-    @Column(name="name", nullable=false)
+    @Column(name = "name", nullable = false)
     private String name;
 
-    @Column(name="priority", nullable=false)
+    @Column(name = "priority", nullable = false)
     private Integer priority;
 
-    @Column(name="is_full_day", nullable=false)
+    @Column(name = "is_full_day", nullable = false)
     private boolean isFullDay;
 
-    @Column(name="is_private", nullable=false)
+    @Column(name = "is_private", nullable = false)
     private boolean isPrivate;
 
-    @Column(name="start")
+    @Column(name = "start")
     private Time start;
 
-    @Column(name="end")
+    @Column(name = "end")
     private Time end;
 
     @OneToMany(mappedBy = "event")

server/src/main/java/com/vpr/server/data/User.java

@@ -4,7 +4,15 @@ import javax.persistence.*;
 import java.util.List;
 
 // @Entity creates a table out of this class with Hibernate
-@Entity
+@Entity(name = "User")
+@Table(name = "user")
+@NamedNativeQueries({
+        @NamedNativeQuery(
+                name = "getAllUser",
+                query = "SELECT * FROM user",
+                resultClass = User.class
+        )
+})
 public class User {
     // Generate the primary key
     @Id

server/src/main/java/com/vpr/server/json/JSONMapper.java

@@ -0,0 +1,80 @@
+package com.vpr.server.json;
+
+import com.vpr.server.data.Event;
+import com.vpr.server.data.User;
+import com.vpr.server.data.UserEvent;
+
+import java.sql.Time;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class JSONMapper {
+
+    public static String userToJSON(User user) {
+        return "{" +
+                "\"userId\": " + user.getId() + ", " +
+                "\"forename\": \"" + user.getForename() + "\", " +
+                "\"name\": \"" + user.getName() + "\", " +
+                "\"login\": \"" + user.getLogin() + "\"," +
+                "\"isAdmin\": " + user.isAdmin() +
+                "}";
+    }
+
+    public static String userListToJSON(List<User> userList) {
+        StringBuilder userListJSON = new StringBuilder();
+        for (User user : userList) {
+            userListJSON.append(", ");
+            userListJSON.append(userToJSON(user));
+        }
+        userListJSON.delete(0, 2);
+
+        return "[" + userListJSON + "]";
+    }
+
+    public static List<String> eventToJSON(Event event) {
+        List<String> eventListJSON = new ArrayList<>();
+
+        for (UserEvent userEvent : event.getUserEvent()) {
+
+            String eventJSON = "{" +
+                    "\"ownerId\": " + userEvent.getUser().getId() + ", " +
+                    "\"ownerName\": \"" + userEvent.getUser().getForename() + " " + userEvent.getUser().getName() + "\", " +
+                    "\"date\": \"" + userEvent.getDate() + "\", " +
+                    "\"id\": " + event.getId() + "," +
+                    "\"name\": \"" + event.getName() + "\"," +
+                    "\"priority\": " + event.getPriority() + "," +
+                    "\"fullDay\": " + event.isFullDay() + "," +
+                    "\"private\": " + event.isPrivate() + "," +
+                    "\"start\": " + timeToJSON(event.getStart()) + "," +
+                    "\"end\": " + timeToJSON(event.getEnd()) +
+                    "}";
+
+            eventListJSON.add(eventJSON);
+        }
+
+        return eventListJSON;
+    }
+
+    public static String eventListToJSON(List<Event> eventList) {
+        StringBuilder eventListJSON = new StringBuilder();
+        for (Event event : eventList) {
+            List<String> eventsJSON = eventToJSON(event);
+            for (String eventJSON : eventsJSON) {
+                eventListJSON.append(", ");
+                eventListJSON.append(eventJSON);
+            }
+        }
+        eventListJSON.delete(0, 2);
+
+        return "[" + eventListJSON + "]";
+    }
+
+    public static String timeToJSON(Time time) {
+        if (time == null) {
+            return "null";
+        }
+
+        return "\"" + time + "\"";
+    }
+}

server/src/main/java/com/vpr/server/json/Validator.java

@@ -0,0 +1,47 @@
+package com.vpr.server.json;
+
+import com.vpr.server.data.UserEvent;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+
+import java.sql.Date;
+import java.sql.Time;
+import java.text.SimpleDateFormat;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class Validator {
+    public static String ValidateEventName(String name) throws IllegalArgumentException {
+        if (name.length() < 3) {
+            System.out.println("NAME TO SHORT");
+            throw new IllegalArgumentException("Der Name ist zu kurz");
+        }
+        Pattern pattern = Pattern.compile("[A-Za-z\u00e4\u00f6\u00fc\u00c4\u00d6\u00dc\u00df0-9 =!?+*/$.:,;_<>()-]*");
+        Matcher matcher = pattern.matcher(name);
+        if(!matcher.matches()){
+            System.out.println("NAME HAS ILLEGALCHARS");
+            throw new IllegalArgumentException("Der Name enthält nicht erlaubte Zeichen");
+        }
+        return name;
+    }
+
+    public static Time ValidateEventTime(String time) throws IllegalArgumentException {
+        try {
+            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("hh:mm");
+            long ms = simpleDateFormat.parse(time).getTime();
+            return new Time(ms);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    public static Date ValidateEventDate(String date) throws IllegalArgumentException {
+        try {
+            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
+            return new Date(simpleDateFormat.parse(date).getTime());
+        } catch (Exception e) {
+            System.out.println("DATE FORMAT NOT CORRECT");
+            throw new IllegalArgumentException("Datumformat nicht korrekt");
+        }
+    }
+}

server/src/main/java/com/vpr/server/repository/EventRepository.java

@@ -1,17 +1,25 @@
 package com.vpr.server.repository;
 
 import com.vpr.server.data.Event;
+import com.vpr.server.data.UserEvent;
 import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.CrudRepository;
 
+import javax.persistence.ColumnResult;
+import javax.persistence.ConstructorResult;
+import javax.persistence.NamedNativeQuery;
+import javax.persistence.SqlResultSetMapping;
 import javax.transaction.Transactional;
+import java.util.List;
+import java.util.Optional;
 
 // This will be AUTO IMPLEMENTED by Spring into a Bean called eventRepository
 // CRUD refers Create, Read, Update, Delete
 
 public interface EventRepository extends CrudRepository<Event, Integer> {
-    @Query(value = "SELECT e.id AS eid, e.name AS ename, e.start, e.end, e.priority , e.is_full_day, " +
+    @Query(
+            value = "SELECT e.id AS eid, e.name AS ename, e.start, e.end, e.priority , e.is_full_day, " +
             "ue.date, " +
             "u.id AS uid, u.forename, u.name AS uname " +
             "FROM event e " +
@@ -21,27 +29,53 @@ public interface EventRepository extends CrudRepository<Event, Integer> {
             "ON ue.user_id = u.id " +
             "WHERE u.id = ?1 " +
             "OR e.is_private = 0",
-            nativeQuery = true)
+            nativeQuery = true
+    )
     Object[] findAllVisibleByUserId(long id);
 
-    @Query(value = "SELECT * " +
+    @Query(
+            value = "SELECT * " +
             "FROM event e " +
             "INNER JOIN user_event ue " +
             "ON e.id = ue.event_id " +
             "WHERE ue.user_id = ?1",
-            nativeQuery = true)
+            nativeQuery = true
+    )
     Object[] findAllByUserId(long id);
 
+
+    @Query(
+            value = "SELECT ue.user_id as userId, ue.event_id as eventId, ue.date as date " +
+                    "FROM event e " +
+                    "INNER JOIN user_event ue " +
+                    "ON e.id = ue.event_id " +
+                    "WHERE ue.event_id = ?1 " +
+                    "AND ue.user_id = ?2 " +
+                    "AND ue.date = ?3",
+            nativeQuery = true
+    )
+    UserEventInterface findUserEventByEventIdUserIdAndDate(long eventId, long userId, String date);
+
+    interface UserEventInterface{
+        long getEventId();
+        long getUserId();
+        long getDate();
+    }
+
     @Modifying
     @Transactional
-    @Query(value = "DELETE ue FROM user_event ue WHERE ue.event_id = ?1",
-    nativeQuery = true)
-    void deleteUserEventsById(long id);
+    @Query(
+            value = "DELETE ue FROM user_event ue WHERE ue.event_id = :eventId AND ue.user_id = :userId AND ue.date = :date",
+            nativeQuery = true
+    )
+    void deleteUserEventsById(long userId, long eventId, String date);
 
 
     @Modifying
     @Transactional
-    @Query(value = "DELETE e FROM event e WHERE e.id = ?1",
-            nativeQuery = true)
+    @Query(
+            value = "DELETE e FROM event e WHERE e.id = ?1",
+            nativeQuery = true
+    )
     void deleteById(long id);
 }

server/src/main/java/com/vpr/server/repository/UserRepository.java

@@ -20,4 +20,6 @@ public interface UserRepository extends CrudRepository<User, Integer> {
     User findByLoginAndPassword(String login, byte[] password);
 
     void deleteById(long id);
+
+    User findByToken(String token);
 }