카카오 파일 링크 추출 api 구현 Merge

#63 카카오 파일 링크 추출 api 구현

linknamu/src/main/java/com/kakao/linknamu/_core/exception/GlobalExceptionHandler.java

@@ -11,6 +11,7 @@
 import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
 import org.springframework.web.method.annotation.MethodArgumentTypeMismatchException;
+import org.springframework.web.multipart.support.MissingServletRequestPartException;
 
 import java.util.List;
 
@@ -36,6 +37,11 @@ public ResponseEntity<?> dtoTypeMismatchException(Exception e) {
         return new ResponseEntity<>(ApiUtils.error("입력의 타입이 올바르지 않습니다.", HttpStatus.BAD_REQUEST.value()), HttpStatus.BAD_REQUEST);
     }
 
+    @ExceptionHandler({MissingServletRequestPartException.class})
+    public ResponseEntity<?> requestPartMissingException(Exception e) {
+        return new ResponseEntity<>(ApiUtils.error("form-data 형식에 file이라는 이름이 존재하지 않습니다.", HttpStatus.BAD_REQUEST.value()), HttpStatus.BAD_REQUEST);
+    }
+
     @ExceptionHandler({Exception400.class, Exception401.class, Exception403.class, Exception404.class})
     public ResponseEntity<?> clientException(ClientException e) {
         return new ResponseEntity<>(e.body(), e.status());

linknamu/src/main/java/com/kakao/linknamu/kakao/KakaoExceptionStatus.java

@@ -0,0 +1,19 @@
+package com.kakao.linknamu.category;
+
+import com.kakao.linknamu._core.exception.BaseExceptionStatus;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public enum KakaoExceptionStatus implements BaseExceptionStatus {
+
+    FILE_INVALID_FORMAT("파일이 txt 또는 csv 형식이 아닙니다.", 400),
+    FILE_NOTFOUND("파일이 존재하지 않습니다.", 400),
+    FILE_READ_FAILED("파일을 읽는 과정에서 오류가 발생했습니다.", 500);
+
+
+    @Getter
+    private final String message;
+    @Getter
+    private final int status;
+}

linknamu/src/main/java/com/kakao/linknamu/kakao/controller/KakaoSendMeController.java

@@ -0,0 +1,35 @@
+package com.kakao.linknamu.kakao.controller;
+
+import com.kakao.linknamu._core.util.ApiUtils;
+import com.kakao.linknamu.kakao.dto.KakaoSendMeResponseDto;
+import com.kakao.linknamu.kakao.service.KaKaoSendMeService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestPart;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.util.List;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/api/kakao")
+public class KakaoSendMeController {
+
+    private final KaKaoSendMeService kaKaoSendMeService;
+
+
+    //1. 단순히 file만 요청 받을 경우 => @RequestParam 어노테이션과 MultipartFile 객체사용
+    //2, file과 json 을 같이 받을 경우 => @RequestPart 어노테이션과 json을 받을 DTO에 key 값을 지정
+
+    @PostMapping("/send-me")
+    public ResponseEntity<?> getKaKaoSendMeText(@RequestPart(value = "file") MultipartFile multipartFile) {
+
+        List<KakaoSendMeResponseDto> responseDtos = kaKaoSendMeService.extractLink(multipartFile);
+
+
+        return ResponseEntity.ok(ApiUtils.success(responseDtos));
+    }
+}

linknamu/src/main/java/com/kakao/linknamu/kakao/dto/KakaoSendMeResponseDto.java

@@ -0,0 +1,9 @@
+package com.kakao.linknamu.kakao.dto;
+
+public record KakaoSendMeResponseDto(
+        String link
+
+) {
+
+
+}

linknamu/src/main/java/com/kakao/linknamu/kakao/service/KaKaoSendMeService.java

@@ -0,0 +1,60 @@
+package com.kakao.linknamu.kakao.service;
+
+import com.kakao.linknamu._core.exception.Exception400;
+import com.kakao.linknamu._core.exception.Exception500;
+import com.kakao.linknamu.category.KakaoExceptionStatus;
+import com.kakao.linknamu.kakao.dto.KakaoSendMeResponseDto;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+@Transactional(readOnly = true)
+@RequiredArgsConstructor
+@Service
+public class KaKaoSendMeService {
+
+
+    public List<KakaoSendMeResponseDto> extractLink(MultipartFile multipartFile) {
+
+        List<KakaoSendMeResponseDto> responseDtos = new ArrayList<>();
+
+        if (multipartFile.isEmpty()) throw new Exception400(KakaoExceptionStatus.FILE_NOTFOUND);
+
+        String contentType = multipartFile.getContentType();
+
+        boolean isSupportedFormat = (contentType.equals("text/plain")) || (contentType.equals("text/csv"));
+
+        if (isSupportedFormat == false) throw new Exception400(KakaoExceptionStatus.FILE_INVALID_FORMAT);
+
+
+        try {
+            byte[] fileBytes = multipartFile.getBytes();
+            String fileContent = new String(fileBytes, StandardCharsets.UTF_8); // byte 배열을 문자열로 변환
+
+//          https 링크를 추출하기 위한 정규 표현식
+            String regex = "https?://[a-zA-Z0-9\\-\\.]+(\\:[0-9]+)?\\.[a-zA-Z]{2,3}(\\S*)?";
+
+
+//        \bhttps?://\S+   => 모든 http, https 도메인 검출
+            Pattern pattern = Pattern.compile(regex);
+            Matcher matcher = pattern.matcher(fileContent);
+            while (matcher.find()) {
+                String httpsLink = matcher.group();
+                responseDtos.add(new KakaoSendMeResponseDto(httpsLink));
+            }
+            return responseDtos;
+        } catch (IOException e) {
+            throw new Exception500(KakaoExceptionStatus.FILE_READ_FAILED);
+        }
+
+
+    }
+}