feat: 画像読み込みに対応

hideout-core/src/main/kotlin/dev/usbharu/hideout/core/config/SecurityConfig.kt

@@ -82,6 +82,7 @@ class SecurityConfig {
                 authorize(GET, "/auth/sign_up", hasRole("ANONYMOUS"))
                 authorize(POST, "/auth/sign_up", permitAll)
                 authorize(GET, "/users/{username}/posts/{postId}", permitAll)
+                authorize(GET, "/files/*", permitAll)
 
                 authorize(anyRequest, authenticated)
             }

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

@@ -16,21 +16,44 @@
 
 package dev.usbharu.hideout.core.interfaces.api.media
 
+import dev.usbharu.hideout.core.config.LocalStorageConfig
+import dev.usbharu.hideout.core.external.media.FileTypeDeterminer
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty
 import org.springframework.core.io.ClassPathResource
+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)
-interface LocalFileController {
+class LocalFileController(
+    localStorageConfig: LocalStorageConfig,
+    private val fileTypeDeterminationService: FileTypeDeterminer
+) {
+
+    private val savePath = Path.of(localStorageConfig.path).toAbsolutePath()
 
     @GetMapping("/files/{id}")
-    fun files(@PathVariable("id") id: String): ResponseEntity<Resource>
+    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)
+    }
 
     @GetMapping("/users/{user}/icon.jpg", "/users/{user}/header.jpg")
     fun icons(): ResponseEntity<Resource> {