feat: initial implementation of UserController class

Author: stark-cybertech

server/user/src/main/java/meet_at_mensa/user/controller/UserController.java

@@ -0,0 +1,109 @@
+package meet_at_mensa.user.controller;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.RestController;
+
+import meet_at_mensa.user.exception.UserNotFoundException;
+import meet_at_mensa.user.service.UserService;
+
+import org.openapitools.api.UserApi;
+import org.openapitools.model.User;
+import org.openapitools.model.UserNew;
+import org.openapitools.model.UserUpdate;
+
+import java.util.UUID;
+
+
+
+@RestController
+public class UserController implements UserApi {
+
+    // UserService handles database operations
+    @Autowired
+    private UserService userService;
+
+
+    // DELETE @ api/v2/user/{userID}
+    @Override
+    public ResponseEntity<Void> deleteApiV2UserUserID(UUID userID) {
+
+        try {
+            
+            // attempt to delete user with given ID
+            userService.deleteUser(userID);
+
+            // if delete operation succeeded, return 200
+            return ResponseEntity.ok().build();
+
+        } catch (UserNotFoundException e) {
+
+            // if user was not found, return 404
+            return ResponseEntity.notFound().build();
+
+        }
+    }
+
+
+    // GET @ api/v2/user/{userID}
+    @Override
+    public ResponseEntity<User> getApiV2UserUserID(UUID userID) {
+
+        try {
+        
+            // attempt to get user with the given ID
+            User user =  userService.getUser(userID);
+
+            // return 200 with User
+            return ResponseEntity.ok(user);
+        
+
+        } catch (UserNotFoundException e) {
+            
+            // if user was not found, return 404
+            return ResponseEntity.notFound().build();
+
+        }
+    }
+
+
+    // POST @ api/v2/user/register
+    @Override
+    public ResponseEntity<User> postApiV2UserRegister(UserNew userNew) {
+
+        try {
+
+            // attempt to register a new user
+            User newUser = userService.registerUser(userNew);
+
+            return ResponseEntity.status(201).body(newUser);
+
+        } catch (Exception e) {
+
+            // TODO fix signature to match API, this should not return 503
+            return ResponseEntity.internalServerError().build();
+        
+        }
+    }
+
+    // PUT @ api/v2/user/{userID}
+    @Override
+    public ResponseEntity<User> putApiV2UserUserID(UUID userID, UserUpdate userUpdate) {
+
+        try {
+            
+            // attempt to update User
+            User updatedUser = userService.updateUser(userID, userUpdate);
+
+            // return the updated user
+            return ResponseEntity.ok(updatedUser);
+
+        } catch (UserNotFoundException e) {
+            
+            // if user was not found, return 404
+            return ResponseEntity.notFound().build();
+        }
+
+    }
+
+}