[feat] 게시물 좋아요 기능 구현

src/main/java/wanted/media/exception/CustomException.java

@@ -0,0 +1,15 @@
+package wanted.media.exception;
+
+import lombok.Getter;
+
+@Getter
+public class CustomException extends RuntimeException {
+    private final ErrorCode errorCode;
+    private String customMessage;
+
+    public CustomException(ErrorCode errorCode) {
+        super(errorCode.getMessage());
+        this.errorCode = errorCode;
+        this.customMessage = errorCode.getMessage();
+    }
+}

src/main/java/wanted/media/exception/ErrorCode.java

@@ -1,15 +1,16 @@
 package wanted.media.exception;
 
-import org.springframework.http.HttpStatus;
-
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
 
 @Getter
 @RequiredArgsConstructor
 public enum ErrorCode {
-	ENTITY_NOT_FOUND(HttpStatus.NOT_FOUND, "존재하지 않는 엔티티입니다.");
+    ENTITY_NOT_FOUND(HttpStatus.NOT_FOUND, "존재하지 않는 엔티티입니다."),
+    // 클라이언트의 입력 값에 대한 일반적인 오류 (@PathVariable, @RequestParam가 잘못되었을 때)
+    INVALID_INPUT_VALUE(HttpStatus.BAD_REQUEST, "클라이언트의 입력 값을 확인해주세요.");
 
-	private final HttpStatus status;
-	private final String message;
+    private final HttpStatus status;
+    private final String message;
 }

src/main/java/wanted/media/exception/handler/GlobalExceptionHandler.java

@@ -4,15 +4,22 @@
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
-
+import wanted.media.exception.CustomException;
 import wanted.media.exception.ErrorResponse;
 
 @RestControllerAdvice
 public class GlobalExceptionHandler {
 
-	@ExceptionHandler(BadRequestException.class)
-	public ResponseEntity<ErrorResponse> handleBadRequestException(BadRequestException e) {
-		return ResponseEntity.badRequest()
-			.body(new ErrorResponse(400, e.getMessage()));
-	}
+    @ExceptionHandler(BadRequestException.class)
+    public ResponseEntity<ErrorResponse> handleBadRequestException(BadRequestException e) {
+        return ResponseEntity.badRequest()
+                .body(new ErrorResponse(400, e.getMessage()));
+    }
+
+    @ExceptionHandler(CustomException.class)
+    protected ResponseEntity<ErrorResponse> handleCustomException(final CustomException e) {
+        return ResponseEntity
+                .status(e.getErrorCode().getStatus().value())
+                .body(new ErrorResponse(e.getErrorCode().getStatus().value(), e.getCustomMessage()));
+    }
 }

src/main/java/wanted/media/post/controller/PostController.java

@@ -0,0 +1,31 @@
+package wanted.media.post.controller;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import wanted.media.post.dto.PostIdResponse;
+import wanted.media.post.service.PostService;
+
+@RestController
+@RequestMapping("/api/posts")
+@RequiredArgsConstructor
+public class PostController {
+    private final PostService postService;
+
+    @PostMapping("/likes/{postId}")
+    public ResponseEntity getLikes(@PathVariable(name = "postId") String postId) {
+        if (postId == null) {
+            return ResponseEntity.badRequest().body("잘못된 요청입니다.");
+        }
+
+        try {
+            String id = postService.increaseLike(postId);
+            return ResponseEntity.ok().body(new PostIdResponse(id, "좋아요 수 증가 완료"));
+        } catch (Exception e) {
+            return ResponseEntity.internalServerError().body("좋아요 수 증가 실패 : " + e.getMessage());
+        }
+    }
+}

src/main/java/wanted/media/content/domain/Content.java → src/main/java/wanted/media/post/domain/Post.java

@@ -1,4 +1,4 @@
-package wanted.media.content.domain;
+package wanted.media.post.domain;
 
 import jakarta.persistence.*;
 import jakarta.validation.constraints.NotNull;
@@ -13,16 +13,15 @@
 
 @Entity
 @Getter
-@Table(name = "contents")
+@Table(name = "posts")
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
 @AllArgsConstructor
 @Builder
 @EntityListeners(AuditingEntityListener.class)
-public class Content {
+public class Post {
     @Id
-    @GeneratedValue(strategy = GenerationType.IDENTITY)
-    @Column(name = "content_id", nullable = false)
-    private Long id;
+    @Column(name = "post_id", nullable = false)
+    private String id;
 
     @Column(name = "like_count")
     private Long likeCount;
@@ -54,4 +53,7 @@ public class Content {
     @NotNull
     private User user;
 
+    public void addLikeCount() {
+        this.likeCount++;
+    }
 }

src/main/java/wanted/media/content/domain/Type.java → src/main/java/wanted/media/post/domain/Type.java

@@ -1,4 +1,4 @@
-package wanted.media.content.domain;
+package wanted.media.post.domain;
 
 public enum Type {
     FACEBOOK, TWITTER, INSTAGRAM, THREADS;

src/main/java/wanted/media/post/dto/PostIdResponse.java

@@ -0,0 +1,11 @@
+package wanted.media.post.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class PostIdResponse {
+    private final String postId;
+    private final String messgae;
+}

src/main/java/wanted/media/post/repository/PostRepository.java

@@ -0,0 +1,7 @@
+package wanted.media.post.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import wanted.media.post.domain.Post;
+
+public interface PostRepository extends JpaRepository<Post, String> {
+}

src/main/java/wanted/media/post/service/PostService.java

@@ -0,0 +1,60 @@
+package wanted.media.post.service;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import wanted.media.exception.CustomException;
+import wanted.media.exception.ErrorCode;
+import wanted.media.post.domain.Post;
+import wanted.media.post.repository.PostRepository;
+
+@Service
+@RequiredArgsConstructor
+public class PostService {
+    private final PostRepository postRepository;
+
+    @Transactional
+    public String increaseLike(String postId) {
+        if (postId == null) {
+            new CustomException(ErrorCode.INVALID_INPUT_VALUE);
+        }
+
+        // contentId를 통해 게시물의 SNS 유형 조회
+        Post post = postRepository.findById(postId).orElseThrow(() -> new CustomException(ErrorCode.ENTITY_NOT_FOUND));
+
+        String snsType = post.getType().name();
+        // 외부 SNS API 호출 부분 (기능 개발을 위한 요소로, 실제 동작하지 않음)
+        snsApi(snsType, postId);
+
+        // 좋아요 수 증가
+        post.addLikeCount();
+        return postId;
+    }
+
+    // 외부 SNS API 호출 부분 (기능 개발을 위한 요소로, 실제 동작하지 않음)
+    public void snsApi(String snsType, String postId) {
+        String endpoint = "";
+
+        // SNS 유형에 따른 외부 엔드포인트 구성
+        switch (snsType.toLowerCase()) {
+            case "facebook":
+                endpoint = "https://www.facebook.com/likes/" + postId;
+                break;
+            case "twitter":
+                endpoint = "https://www.twitter.com/likes/" + postId;
+                break;
+            case "instagram":
+                endpoint = "https://www.instagram.com/likes/" + postId;
+                break;
+            case "threads":
+                endpoint = "https://www.threads.net/likes/" + postId;
+                break;
+            default:
+                endpoint = null;
+        }
+
+        // 요구사항 시나리오에 따라 필요하지만 실제 동작하지 않기에 주석 처리함
+//        RestTemplate restTemplate = new RestTemplate();
+//        String response = restTemplate.postForObject(endpoint, null, String.class);
+    }
+}