Merge pull request #17 from schoolzone06/refactor/#14

�파일 도메인 리팩토링

src/main/java/schoolzone/schoolzone_backend_v2/domain/file/implementation/FileCreator.java

@@ -0,0 +1,33 @@
+package schoolzone.schoolzone_backend_v2.domain.file.implementation;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.multipart.MultipartFile;
+import schoolzone.schoolzone_backend_v2.global.annotation.Implementation;
+import schoolzone.schoolzone_backend_v2.global.config.file.FileProperties;
+import schoolzone.schoolzone_backend_v2.global.error.exception.ErrorCode;
+import schoolzone.schoolzone_backend_v2.global.error.exception.SchoolzoneException;
+
+import java.io.IOException;
+import java.nio.file.*;
+import java.util.UUID;
+
+@Implementation
+@RequiredArgsConstructor
+public class FileCreator {
+    private final FileProperties fileProperties;
+
+    public String upload(MultipartFile file) {
+        return fileProperties.serverUrl() + save(file);
+    }
+
+    private String save(MultipartFile file) {
+        String filename = UUID.randomUUID() + file.getOriginalFilename();
+        Path path = fileProperties.path().resolve(filename);
+        try {
+            Files.copy(file.getInputStream(), path, StandardCopyOption.REPLACE_EXISTING);
+        } catch (IOException e) {
+            throw new SchoolzoneException(ErrorCode.FILE_SAVE_ERROR);
+        }
+        return path.toString();
+    }
+}

src/main/java/schoolzone/schoolzone_backend_v2/domain/file/implementation/FileReader.java

@@ -0,0 +1,33 @@
+package schoolzone.schoolzone_backend_v2.domain.file.implementation;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.UrlResource;
+import schoolzone.schoolzone_backend_v2.global.annotation.Implementation;
+import schoolzone.schoolzone_backend_v2.global.config.file.FileProperties;
+import schoolzone.schoolzone_backend_v2.global.error.exception.ErrorCode;
+import schoolzone.schoolzone_backend_v2.global.error.exception.SchoolzoneException;
+
+import java.net.MalformedURLException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+@Implementation
+@RequiredArgsConstructor
+public class FileReader {
+    private final FileProperties fileProperties;
+
+    public Resource loadFileAsResource(String fileName) {
+        Path path = Paths.get(fileProperties.path() + fileName).normalize();
+        try {
+            Resource resource = new UrlResource(path.toUri());
+            if (!resource.exists()) {
+                return resource;
+            } else {
+                throw new SchoolzoneException(ErrorCode.FILE_NOT_FOUND);
+            }
+        } catch (MalformedURLException e) {
+            throw new SchoolzoneException(ErrorCode.INVALID_URL_FORMAT);
+        }
+    }
+}

src/main/java/schoolzone/schoolzone_backend_v2/domain/file/presentation/FileController.java

@@ -3,30 +3,35 @@
 import jakarta.servlet.http.HttpServletRequest;
 import lombok.RequiredArgsConstructor;
 import org.springframework.core.io.Resource;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.multipart.MultipartFile;
-import schoolzone.schoolzone_backend_v2.domain.file.presentation.dto.response.FileResponse;
-import schoolzone.schoolzone_backend_v2.domain.file.service.GetFileService;
-import schoolzone.schoolzone_backend_v2.domain.file.service.PostFileService;
-
-import java.io.IOException;
+import schoolzone.schoolzone_backend_v2.domain.file.presentation.dto.response.FileResponseDto;
+import schoolzone.schoolzone_backend_v2.domain.file.presentation.dto.response.FileUrlResponseDto;
+import schoolzone.schoolzone_backend_v2.domain.file.service.CommandFileService;
+import schoolzone.schoolzone_backend_v2.domain.file.service.QueryFileService;
 
 @RestController
 @RequiredArgsConstructor
 @RequestMapping("/file")
 public class FileController {
-    private final PostFileService postFileService;
-    private final GetFileService getFileService;
+    private final CommandFileService commandFileService;
+    private final QueryFileService queryFileService;
 
     @PostMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
-    public ResponseEntity<FileResponse> postFile(@RequestPart(value = "file") MultipartFile file) {
-        return postFileService.execute(file);
+    @ResponseStatus(HttpStatus.CREATED)
+    public FileUrlResponseDto postFile(@RequestPart(value = "file") MultipartFile file) {
+        return FileUrlResponseDto.from(commandFileService.create(file));
     }
 
-    @GetMapping
-    public ResponseEntity<Resource> getFile(@RequestParam Long fileId, HttpServletRequest httpServletRequest) throws IOException {
-        return getFileService.execute(fileId, httpServletRequest);
+    @GetMapping("/{fileName}")
+    public ResponseEntity<Resource> getFile(@PathVariable String fileName, HttpServletRequest request) {
+        FileResponseDto dto = queryFileService.getFile(fileName, request);
+        return ResponseEntity.ok()
+                .contentType(MediaType.parseMediaType(dto.contentType()))
+                .header("Content-Type", dto.contentType())
+                .body(dto.resource());
     }
 }

src/main/java/schoolzone/schoolzone_backend_v2/domain/file/presentation/dto/response/FileResponseDto.java

@@ -0,0 +1,9 @@
+package schoolzone.schoolzone_backend_v2.domain.file.presentation.dto.response;
+
+import org.springframework.core.io.Resource;
+
+public record FileResponseDto(
+        Resource resource,
+        String contentType
+) {
+}

src/main/java/schoolzone/schoolzone_backend_v2/domain/file/presentation/dto/response/FileUrlResponseDto.java

@@ -0,0 +1,9 @@
+package schoolzone.schoolzone_backend_v2.domain.file.presentation.dto.response;
+
+public record FileUrlResponseDto(
+    String url
+) {
+    public static FileUrlResponseDto from(String url) {
+        return new FileUrlResponseDto(url);
+    }
+}

src/main/java/schoolzone/schoolzone_backend_v2/domain/file/service/CommandFileService.java

@@ -0,0 +1,18 @@
+package schoolzone.schoolzone_backend_v2.domain.file.service;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.web.multipart.MultipartFile;
+import schoolzone.schoolzone_backend_v2.domain.file.implementation.FileCreator;
+
+@Service
+@Transactional
+@RequiredArgsConstructor
+public class CommandFileService {
+    private final FileCreator fileCreator;
+
+    public String create(MultipartFile file) {
+        return fileCreator.upload(file);
+    }
+}

src/main/java/schoolzone/schoolzone_backend_v2/domain/file/service/QueryFileService.java

@@ -0,0 +1,36 @@
+package schoolzone.schoolzone_backend_v2.domain.file.service;
+
+import jakarta.servlet.http.HttpServletRequest;
+import lombok.RequiredArgsConstructor;
+import org.springframework.core.io.Resource;
+import org.springframework.stereotype.Service;
+import schoolzone.schoolzone_backend_v2.domain.file.implementation.FileReader;
+import schoolzone.schoolzone_backend_v2.domain.file.presentation.dto.response.FileResponseDto;
+
+import java.io.IOException;
+
+@Service
+@RequiredArgsConstructor
+public class QueryFileService {
+    private final FileReader fileReader;
+
+    public FileResponseDto getFile(String fileName, HttpServletRequest request) {
+        Resource resource = fileReader.loadFileAsResource(fileName);
+        String contentType = getContentType(resource, request);
+        return new FileResponseDto(resource, contentType);
+    }
+
+    private String getContentType(Resource resource, HttpServletRequest request) {
+        String contentType = "application/octet-stream";
+        try {
+            String mimeType = request.getServletContext().getMimeType(resource.getFile().getAbsolutePath());
+            if (mimeType != null) {
+                contentType = mimeType;
+            }
+        }
+        catch (IOException ignored) {
+        }
+        return contentType;
+    }
+
+}

src/main/java/schoolzone/schoolzone_backend_v2/global/config/file/FileProperties.java

@@ -0,0 +1,21 @@
+package schoolzone.schoolzone_backend_v2.global.config.file;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.context.properties.bind.ConstructorBinding;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+@ConfigurationProperties(prefix = "file")
+public record FileProperties(
+    Path path,
+    String serverUrl
+) {
+    @ConstructorBinding
+    public FileProperties(String path, String serverUrl) {
+        this(
+                Paths.get(path),
+                serverUrl
+        );
+    }
+}

src/main/java/schoolzone/schoolzone_backend_v2/global/error/exception/ErrorCode.java

@@ -35,7 +35,8 @@ public enum ErrorCode {
 
     // file
     FILE_SAVE_ERROR(500, "FILE-500-1", "파일 저장 중 오류가 발생했습니다."),
-    FILE_NOT_FOUND(404, "FILE-404-1", "파일을 찾을 수 없습니다.");
+    FILE_NOT_FOUND(404, "FILE-404-1", "파일을 찾을 수 없습니다."),
+    INVALID_URL_FORMAT(400, "FILE-400-1", "유효하지 않은 URL 형식입니다");
 
     private final int status;
     private final String code;