Initial Commit

backend/common/src/main/java/dev/rheinsw/shared/entity/BaseEntity.java

@@ -0,0 +1,37 @@
+package dev.rheinsw.shared.entity;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.MappedSuperclass;
+import jakarta.persistence.PrePersist;
+import jakarta.persistence.PreUpdate;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.time.LocalDateTime;
+
+/**
+ * @author Thatsaphorn Atchariyaphap
+ * @since 26.04.25
+ */
+
+@Getter
+@Setter
+@MappedSuperclass
+public abstract class BaseEntity {
+
+    @Column(name = "createdDateTime", nullable = false, updatable = false)
+    private LocalDateTime createdDateTime;
+
+    @Column(name = "modifiedDateTime")
+    private LocalDateTime modifiedDateTime;
+
+    @PrePersist
+    protected void onCreate() {
+        createdDateTime = LocalDateTime.now();
+    }
+
+    @PreUpdate
+    protected void onUpdate() {
+        modifiedDateTime = LocalDateTime.now();
+    }
+}

backend/common/src/main/java/dev/rheinsw/shared/mail/MailServiceClient.java

@@ -0,0 +1,50 @@
+package dev.rheinsw.shared.mail;
+
+import dev.rheinsw.shared.mail.dto.MailRequest;
+import lombok.RequiredArgsConstructor;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.scheduling.annotation.Async;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * @author Thatsaphorn Atchariyaphap
+ * @since 22.04.25
+ */
+@Service
+@RequiredArgsConstructor
+public class MailServiceClient {
+
+    private static final Logger log = LoggerFactory.getLogger(MailServiceClient.class);
+
+    private final RestTemplate restTemplate;
+
+    private static final String MAIL_ENDPOINT = "http://gateway/api/mail";
+
+    @Value("${INTERNAL_API_KEY}")
+    private String internalApiKey;
+
+    @Async
+    public void sendMail(String email, String subject, String userMessage) {
+        MailRequest request = new MailRequest(email, subject, userMessage);
+        postEmail(request);
+    }
+
+    private void postEmail(MailRequest request) {
+        try {
+            HttpHeaders headers = new HttpHeaders();
+            headers.set("X-Internal-Auth", internalApiKey);
+
+            HttpEntity<MailRequest> entity = new HttpEntity<>(request, headers);
+
+            restTemplate.postForEntity(MAIL_ENDPOINT + "/send", entity, String.class);
+        } catch (Exception e) {
+            log.error("Failed to send email to {}: {}", request.getTo(), e.getMessage());
+        }
+    }
+
+}

backend/common/src/main/java/dev/rheinsw/shared/mail/dto/MailRequest.java

@@ -0,0 +1,20 @@
+package dev.rheinsw.shared.mail.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+/**
+ * @author Thatsaphorn Atchariyaphap
+ * @since 22.04.25
+ */
+@Data
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
+public class MailRequest {
+    private String to;
+    private String subject;
+    private String message;
+}

backend/common/src/main/java/dev/rheinsw/shared/rest/RestTemplateConfig.java

@@ -0,0 +1,20 @@
+package dev.rheinsw.shared.rest;
+
+import org.springframework.cloud.client.loadbalancer.LoadBalanced;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * @author Thatsaphorn Atchariyaphap
+ * @since 23.04.25
+ */
+@Configuration
+public class RestTemplateConfig {
+
+    @LoadBalanced
+    @Bean
+    public RestTemplate mailRestTemplate() {
+        return new RestTemplate();
+    }
+}

backend/common/src/main/java/dev/rheinsw/shared/transport/Dto.java

@@ -0,0 +1,10 @@
+package dev.rheinsw.shared.transport;
+
+import java.io.Serializable;
+
+/**
+ * @author Bummsa / BoomerHD / Thatsaphorn Atchariyaphap
+ * @since 21.04.25
+ */
+public interface Dto extends Serializable {
+}