fix: #188 で指定したエンドポイントでファイルを取得できない問題を修正

src/main/kotlin/dev/usbharu/hideout/application/config/SecurityConfig.kt

@@ -186,6 +186,7 @@ class SecurityConfig {
                 authorize(POST, "/api/v1/accounts", permitAll)
 
                 authorize("/auth/sign_up", hasRole("ANONYMOUS"))
+                authorize(GET, "/files", permitAll)
 
                 authorize(GET, "/api/v1/accounts/verify_credentials", hasAnyScope("read", "read:accounts"))
 

src/main/kotlin/dev/usbharu/hideout/core/interfaces/api/media/LocalFileController.kt

@@ -0,0 +1,40 @@
+package dev.usbharu.hideout.core.interfaces.api.media
+
+import dev.usbharu.hideout.application.config.LocalStorageConfig
+import dev.usbharu.hideout.core.service.media.FileTypeDeterminationService
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty
+import org.springframework.core.io.PathResource
+import org.springframework.core.io.Resource
+import org.springframework.http.MediaType
+import org.springframework.http.ResponseEntity
+import org.springframework.stereotype.Controller
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PathVariable
+import java.nio.file.Path
+import kotlin.io.path.name
+
+@Controller
+@ConditionalOnProperty("hideout.storage.type", havingValue = "local", matchIfMissing = true)
+class LocalFileController(
+    localStorageConfig: LocalStorageConfig,
+    private val fileTypeDeterminationService: FileTypeDeterminationService
+) {
+
+    private val savePath = Path.of(localStorageConfig.path).toAbsolutePath()
+
+    @GetMapping("/files/{id}")
+    fun files(@PathVariable("id") id: String): ResponseEntity<Resource> {
+
+        val name = Path.of(id).name
+        val path = savePath.resolve(name)
+
+        val mimeType = fileTypeDeterminationService.fileType(path, name)
+        val pathResource = PathResource(path)
+
+        return ResponseEntity
+            .ok()
+            .contentType(MediaType(mimeType.type, mimeType.subtype))
+            .contentLength(pathResource.contentLength())
+            .body(pathResource)
+    }
+}