feat: add search module

src/main/java/com/openisle/controller/SearchController.java

@@ -0,0 +1,96 @@
+package com.openisle.controller;
+
+import com.openisle.model.Post;
+import com.openisle.model.Comment;
+import com.openisle.model.User;
+import com.openisle.service.SearchService;
+import lombok.Data;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+@RestController
+@RequestMapping("/api/search")
+@RequiredArgsConstructor
+public class SearchController {
+    private final SearchService searchService;
+
+    @GetMapping("/users")
+    public List<UserDto> searchUsers(@RequestParam String keyword) {
+        return searchService.searchUsers(keyword).stream()
+                .map(this::toUserDto)
+                .collect(Collectors.toList());
+    }
+
+    @GetMapping("/posts")
+    public List<PostDto> searchPosts(@RequestParam String keyword) {
+        return searchService.searchPosts(keyword).stream()
+                .map(this::toPostDto)
+                .collect(Collectors.toList());
+    }
+
+    @GetMapping("/posts/content")
+    public List<PostDto> searchPostsByContent(@RequestParam String keyword) {
+        return searchService.searchPostsByContent(keyword).stream()
+                .map(this::toPostDto)
+                .collect(Collectors.toList());
+    }
+
+    @GetMapping("/posts/title")
+    public List<PostDto> searchPostsByTitle(@RequestParam String keyword) {
+        return searchService.searchPostsByTitle(keyword).stream()
+                .map(this::toPostDto)
+                .collect(Collectors.toList());
+    }
+
+    @GetMapping("/global")
+    public List<SearchResultDto> global(@RequestParam String keyword) {
+        return searchService.globalSearch(keyword).stream()
+                .map(r -> {
+                    SearchResultDto dto = new SearchResultDto();
+                    dto.setType(r.type());
+                    dto.setId(r.id());
+                    dto.setText(r.text());
+                    return dto;
+                })
+                .collect(Collectors.toList());
+    }
+
+    private UserDto toUserDto(User user) {
+        UserDto dto = new UserDto();
+        dto.setId(user.getId());
+        dto.setUsername(user.getUsername());
+        return dto;
+    }
+
+    private PostDto toPostDto(Post post) {
+        PostDto dto = new PostDto();
+        dto.setId(post.getId());
+        dto.setTitle(post.getTitle());
+        return dto;
+    }
+
+    @Data
+    private static class UserDto {
+        private Long id;
+        private String username;
+    }
+
+    @Data
+    private static class PostDto {
+        private Long id;
+        private String title;
+    }
+
+    @Data
+    private static class SearchResultDto {
+        private String type;
+        private Long id;
+        private String text;
+    }
+}