feat/OPS-390: NEWS API 수정 추가 사항 반영.

Author: Kimgooner

src/main/java/org/tuna/zoopzoop/backend/domain/news/controller/ApiV1NewsController.java

@@ -26,6 +26,7 @@ public class ApiV1NewsController {
     private final NewsAPIService newsSearchService;
     private final NewsService newsService;
 
+
     /**
      * 최신 뉴스 목록을 조회하는 API
      * 한번에 100개를 조회 합니다.
@@ -98,4 +99,33 @@ public Mono<ResponseEntity<RsData<ResBodyForNaverNews>>> searchNewsByRecommends(
                                 response
                         )));
     }
+
+    /**
+     * 공유 아카이브의 폴더 내부의 자료를 기반으로 키워드를 추천해서 검색하는 뉴스 API
+     * HTTP METHOD: GET
+     * 한번에 100개를 조회 합니다.
+     * @param userDetails 로그인한 사용자
+     * @param spaceId 대상 스페이스 id
+     * @param folderId 대상 폴더 id
+     */
+    @GetMapping("/recommends/shared/{spaceId}/{folderId}")
+    @Operation(summary = "개인 아카이브 뉴스 추천")
+    public Mono<ResponseEntity<RsData<ResBodyForNaverNews>>> searchNewsByRecommends(
+            @AuthenticationPrincipal CustomUserDetails userDetails,
+            @PathVariable Integer spaceId,
+            @PathVariable Integer folderId
+    ) {
+        Member member = userDetails.getMember();
+        List<String> frequency = newsService.getTagFrequencyFromFilesInSharing(spaceId, member.getId(), folderId);
+        String query = String.join(" ", frequency);
+
+        return newsSearchService.searchNews(query, "sim")
+                .map(response -> ResponseEntity
+                        .status(HttpStatus.OK)
+                        .body(new RsData<>(
+                                "200",
+                                "키워드 기반 뉴스 목록을 조회했습니다.",
+                                response
+                        )));
+    }
 }

src/main/java/org/tuna/zoopzoop/backend/domain/news/service/NewsService.java

@@ -5,6 +5,9 @@
 import org.tuna.zoopzoop.backend.domain.archive.folder.service.PersonalArchiveFolderService;
 import org.tuna.zoopzoop.backend.domain.datasource.dto.FileSummary;
 import org.tuna.zoopzoop.backend.domain.datasource.dto.FolderFilesDto;
+import org.tuna.zoopzoop.backend.domain.member.entity.Member;
+import org.tuna.zoopzoop.backend.domain.member.service.MemberService;
+import org.tuna.zoopzoop.backend.domain.space.archive.service.SpaceArchiveFolderService;
 
 import java.util.Comparator;
 import java.util.List;
@@ -15,6 +18,8 @@
 @RequiredArgsConstructor
 public class NewsService {
     private final PersonalArchiveFolderService folderService;
+    private final SpaceArchiveFolderService spaceArchiveFolderService;
+    private final MemberService memberService;
 
     public List<String> getTagFrequencyFromFiles(Integer memberId, Integer folderId) {
         FolderFilesDto folderFilesDto = folderService.getFilesInFolder(memberId, folderId);
@@ -39,4 +44,29 @@ public List<String> getTagFrequencyFromFiles(Integer memberId, Integer folderId)
 
         return frequency;
     }
+
+    public List<String> getTagFrequencyFromFilesInSharing(Integer spaceId, Integer memberId, Integer folderId) {
+        Member member = memberService.findById(memberId);
+        FolderFilesDto folderFilesDto = spaceArchiveFolderService.getFilesInFolder(spaceId, member, folderId);
+
+        List<FileSummary> files = folderFilesDto.files();
+
+        Map<String, Long> tags = files.stream()
+                .flatMap(file -> {
+                    List<String> ts = file.tags();
+                    return (ts == null ? List.<String>of() : ts).stream();
+                })
+                .collect(Collectors.groupingBy(
+                        tagName -> tagName,
+                        Collectors.counting()
+                ));
+
+        List<String> frequency = tags.entrySet().stream()
+                .sorted(Map.Entry.comparingByValue(Comparator.reverseOrder()))
+                .limit(3)
+                .map(Map.Entry::getKey)
+                .toList();
+
+        return frequency;
+    }
 }