Added /api/v1/auth endpoint for server-handled auth

src/main/java/me/imsonmia/epqapi/controller/AuthController.java

@@ -0,0 +1,73 @@
+package me.imsonmia.epqapi.controller;
+
+import java.util.Date;
+import java.util.Optional;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+import io.micrometer.common.lang.Nullable;
+import me.imsonmia.epqapi.repository.UserRepository;
+
+@RequestMapping("/api/v1")
+public class AuthController {
+    private UserRepository userRepository;
+    private Logger logger = LoggerFactory.getLogger(getClass());
+
+    /**
+     * AuthData
+     */
+    public class AuthData {
+
+        private boolean success;
+        private boolean hasProfile;
+        private boolean exists;
+        private String authMessage;
+        private long authResponseTimestampMillis;
+
+        public AuthData(boolean success, boolean hasProfile, @Nullable String authMessage) {
+            this.success = success;
+            this.hasProfile = hasProfile;
+            this.authMessage = authMessage == null ? "" : authMessage;
+            this.authResponseTimestampMillis = new Date().getTime();
+        }
+    }
+
+    public abstract class AuthRequestData {
+        private String userName;
+        private String userPasswordHash;
+
+        public AuthRequestData(String userName, String userPasswordHash) {
+            this.userName = userName;
+            this.userPasswordHash = userPasswordHash;
+        }
+    }
+
+    /**
+     * Authentication HTTPS endpoint used instead of client-side verification which
+     * is unsafe
+     */
+    @PostMapping("/auth")
+    public ResponseEntity<AuthData> authLogin(@RequestBody AuthRequestData authRequestData) {
+        if (!userRepository.existsByUserName(authRequestData.userName)) {
+
+            logger.info("Invalid login since user doesn't exist");
+            return new ResponseEntity<AuthData>(new AuthData(
+                    false,
+                    false,
+                    "Login invalid: User doesn't exist in database."),
+                    null,
+                    200);
+        }
+        String pwdHash = userRepository.findByUserName(authRequestData.userName).get().getPasswordHash();
+        if (pwdHash != authRequestData.userPasswordHash) {
+            return new ResponseEntity<>(new AuthData(false, true, "Login invalid: Password incorrect."), null, 200);
+        } else {
+            return new ResponseEntity<>(new AuthData(true, true, "Authentication success"), null, 200);
+        }
+    }
+}