feat: 파일 서빙, 다운로드, 삭제 API

src/main/kotlin/com/wafflestudio/csereal/core/resource/mainImage/api/FileController.kt

@@ -0,0 +1,68 @@
+package com.wafflestudio.csereal.core.resource.mainImage.api
+
+import jakarta.servlet.http.HttpServletRequest
+import org.springframework.beans.factory.annotation.Value
+import org.springframework.core.io.Resource
+import org.springframework.core.io.UrlResource
+import org.springframework.http.HttpHeaders
+import org.springframework.http.HttpStatus
+import org.springframework.http.ResponseEntity
+import org.springframework.web.bind.annotation.*
+import java.net.URLEncoder
+import java.nio.file.Files
+import java.nio.file.Paths
+import kotlin.text.Charsets.UTF_8
+
+
+@RequestMapping("/file")
+@RestController
+class FileController(
+    @Value("\${csereal.upload.path}")
+    private val uploadPath: String
+) {
+
+    @GetMapping("/{filename:.+}")
+    fun serveFile(
+        @PathVariable filename: String,
+        @RequestParam(defaultValue = "false") download: Boolean,
+        request: HttpServletRequest
+    ): ResponseEntity<Resource> {
+        val file = Paths.get(uploadPath, filename)
+        val resource = UrlResource(file.toUri())
+
+        if (resource.exists() || resource.isReadable) {
+            val contentType: String? = request.servletContext.getMimeType(resource.file.absolutePath)
+            val headers = HttpHeaders()
+
+            headers.contentType =
+                org.springframework.http.MediaType.parseMediaType(contentType ?: "application/octet-stream")
+
+            if (download) {
+                val originalFilename = filename.substringAfter("_")
+
+                val encodedFilename = URLEncoder.encode(originalFilename, UTF_8.toString()).replace("+", "%20")
+
+                headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename*=UTF-8''$encodedFilename")
+            }
+
+            return ResponseEntity.ok()
+                .headers(headers)
+                .body(resource)
+        } else {
+            return ResponseEntity.status(HttpStatus.NOT_FOUND).build()
+        }
+    }
+
+    @DeleteMapping("/{filename:.+}")
+    fun deleteFile(@PathVariable filename: String): ResponseEntity<Any> {
+        val file = Paths.get(uploadPath, filename)
+
+        if (Files.exists(file)) {
+            Files.delete(file)
+            return ResponseEntity.status(HttpStatus.NO_CONTENT).build()
+        } else {
+            return ResponseEntity.status(HttpStatus.NOT_FOUND).body("파일을 찾을 수 없습니다.")
+        }
+    }
+
+}

src/main/kotlin/com/wafflestudio/csereal/core/resource/mainImage/service/MainImageService.kt

@@ -58,11 +58,11 @@ class ImageServiceImpl(
 
         val filename = "${timeMillis}_${requestImage.originalFilename}"
         val totalFilename = path + filename
-        val saveFile = Paths.get("$totalFilename.$extension")
+        val saveFile = Paths.get(totalFilename)
         requestImage.transferTo(saveFile)
 
         val totalThumbnailFilename = "${path}thumbnail_$filename"
-        val thumbnailFile = Paths.get("$totalThumbnailFilename.$extension")
+        val thumbnailFile = Paths.get(totalThumbnailFilename)
         Thumbnailator.createThumbnail(saveFile.toFile(), thumbnailFile.toFile(), 100, 100);
 
         val image = MainImageEntity(
@@ -91,7 +91,7 @@ class ImageServiceImpl(
     @Transactional
     override fun createImageURL(image: MainImageEntity?): String? {
         return if (image != null) {
-            "${endpointProperties.backend}/image/${image.filename}"
+            "${endpointProperties.backend}/file/${image.filename}"
         } else null
     }