feat(validation): add request and domain validation for email use case

infrastructure/src/main/java/com/pablotj/restemailbridge/infrastructure/config/UseCaseConfig.java

@@ -4,6 +4,7 @@ import com.pablotj.restemailbridge.application.port.in.EmailDefaultConfigPort;
 import com.pablotj.restemailbridge.application.port.out.EmailPort;
 import com.pablotj.restemailbridge.application.usecase.SendEmailUseCase;
 import com.pablotj.restemailbridge.domain.repository.EmailRepository;
+import com.pablotj.restemailbridge.domain.service.EmailValidatorService;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
@@ -12,6 +13,6 @@ public class UseCaseConfig {
 
     @Bean
     public SendEmailUseCase sendEmailUseCase(EmailDefaultConfigPort emailConfigurationPort, EmailPort emailService, EmailRepository emailRepository) {
-        return new SendEmailUseCase(emailConfigurationPort, emailService, emailRepository);
+        return new SendEmailUseCase(new EmailValidatorService(), emailConfigurationPort, emailService, emailRepository);
     }
 }

infrastructure/src/main/java/com/pablotj/restemailbridge/infrastructure/persistence/MailJpa.java

@@ -19,15 +19,15 @@ public class MailJpa {
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
-    @Column(nullable = false)
+    @Column(length = 100, nullable = false)
     private String sender;
 
-    @Column(nullable = false)
+    @Column(length = 100, nullable = false)
     private String recipient;
 
-    @Column(nullable = false)
+    @Column(length = 50, nullable = false)
     private String subjet;
 
-    @Column(nullable = false)
+    @Column(length = 40000, nullable = false)
     private String body;
 }

infrastructure/src/main/java/com/pablotj/restemailbridge/infrastructure/rest/GlobalExceptionHandler.java

@@ -0,0 +1,20 @@
+package com.pablotj.restemailbridge.infrastructure.rest;
+
+import java.util.HashMap;
+import java.util.Map;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<Map<String, String>> handleValidationExceptions(MethodArgumentNotValidException ex) {
+        Map<String, String> errors = new HashMap<>();
+        ex.getBindingResult().getFieldErrors().forEach(error ->
+                errors.put(error.getField(), error.getDefaultMessage()));
+        return ResponseEntity.badRequest().body(errors);
+    }
+}

infrastructure/src/main/java/com/pablotj/restemailbridge/infrastructure/rest/dto/SendMailRequest.java

@@ -1,8 +1,12 @@
 package com.pablotj.restemailbridge.infrastructure.rest.dto;
 
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotBlank;
+import org.hibernate.validator.constraints.Length;
+
 public record SendMailRequest(
-        String from,
-        String subject,
-        String body
+        @NotBlank @Email @Length(min = 4, max = 100) String from,
+        @NotBlank @Length(min=1, max = 30) String subject,
+        @NotBlank @Length(min=1, max = 4000) String body
 ) {
-}
+}