add strategy for controller

src/main/java/ru/soune/no_copy/handler/RegRequestHandler.java

@@ -0,0 +1,59 @@
+package ru.soune.no_copy.handler;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+import org.springframework.validation.BeanPropertyBindingResult;
+import org.springframework.validation.BindingResult;
+import ru.soune.no_copy.dto.BaseRequest;
+import ru.soune.no_copy.dto.MessageCode;
+import ru.soune.no_copy.dto.RegRequest;
+import ru.soune.no_copy.exception.NotValidFieldException;
+import ru.soune.no_copy.exception.ValidationException;
+import ru.soune.no_copy.repository.UserRepository;
+import ru.soune.no_copy.service.AuthService;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class RegRequestHandler implements RequestHandler {
+
+    private final UserRepository userRepository;
+    private final RegRequestValidator regRequestValidator;
+    private final AuthService authService;
+    private final ObjectMapper objectMapper;
+
+    @Override
+    public Map<String, Object> handle(BaseRequest request) throws ValidationException {
+        RegRequest regRequest = objectMapper.convertValue(request.getMessageBody(), RegRequest.class);
+
+        if (userRepository.existsByEmail(regRequest.getEmail())) {
+            throw new NotValidFieldException("User already exists with email: " + regRequest.getEmail(),
+                    request.getMsgId(), MessageCode.REG_EMAIL_EXISTS.getCode(),
+                    MessageCode.REG_EMAIL_EXISTS.getDescription());
+        }
+
+        BindingResult bindingResult = new BeanPropertyBindingResult(regRequest, "regRequest");
+        regRequestValidator.validate(regRequest, bindingResult);
+
+        if (bindingResult.hasErrors()) {
+            throw new ValidationException(bindingResult, request.getMsgId());
+        }
+
+        authService.register(regRequest);
+        return fillResponseInfo(request.getMsgId(), MessageCode.SUCCESS.getCode(),
+                MessageCode.SUCCESS.getDescription());
+    }
+
+    private Map<String, Object> fillResponseInfo(Integer msgId, Integer messageCode, String messageDesc) {
+        Map<String, Object> response = new HashMap<>();
+        response.put("msg_id", msgId);
+        response.put("message_code", messageCode);
+        response.put("message_desc", messageDesc);
+        return response;
+    }
+}