Add UserNotFoundException and validate user in deleteUser

Author: vstanchev

src/main/java/com/helioauth/passkeys/api/service/UserAccountManager.java

@@ -17,6 +17,7 @@
 package com.helioauth.passkeys.api.service;
 
 import com.helioauth.passkeys.api.domain.UserRepository;
+import com.helioauth.passkeys.api.service.exception.UserNotFoundException;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
@@ -33,6 +34,10 @@ public class UserAccountManager {
     private final UserRepository userRepository;
 
     public void deleteUser(UUID userUuid) {
+        if (userUuid == null || !userRepository.existsById(userUuid)) {
+            throw new UserNotFoundException();
+        }
+
         userRepository.deleteById(userUuid);
     }
 }

src/main/java/com/helioauth/passkeys/api/service/exception/UserNotFoundException.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.helioauth.passkeys.api.service.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+/**
+ * @author Viktor Stanchev
+ */
+@ResponseStatus(value = HttpStatus.NOT_FOUND, reason = "User not found")
+public class UserNotFoundException extends RuntimeException {
+
+}