feat: support local storage

app/utils/local_file_storage.ts

@@ -0,0 +1,29 @@
+import fs from "fs";
+import path from "path";
+
+export default class LocalFileStorage {
+  static async get(fileName: string) {
+    const filePath = path.resolve(`./uploads`, fileName);
+    const file = fs.readFileSync(filePath);
+    if (!file) {
+      throw new Error("not found.");
+    }
+    return file;
+  }
+
+  static async put(fileName: string, data: Buffer) {
+    try {
+      const filePath = path.resolve(`./uploads`, fileName);
+      const dir = path.dirname(filePath);
+      if (!fs.existsSync(dir)) {
+        fs.mkdirSync(dir, { recursive: true });
+      }
+      await fs.promises.writeFile(filePath, data);
+      console.log("[LocalFileStorage]", filePath);
+      return `/api/file/${fileName}`;
+    } catch (e) {
+      console.error("[LocalFileStorage]", e);
+      throw e;
+    }
+  }
+}