refactoring

Resolve #7779

packages/backend/src/server/file/index.ts

@@ -0,0 +1,41 @@
+/**
+ * File Server
+ */
+
+import * as fs from 'fs';
+import { fileURLToPath } from 'url';
+import { dirname } from 'path';
+import * as Koa from 'koa';
+import * as cors from '@koa/cors';
+import * as Router from '@koa/router';
+import sendDriveFile from './send-drive-file';
+
+//const _filename = fileURLToPath(import.meta.url);
+const _filename = __filename;
+const _dirname = dirname(_filename);
+
+// Init app
+const app = new Koa();
+app.use(cors());
+app.use(async (ctx, next) => {
+	ctx.set('Content-Security-Policy', `default-src 'none'; style-src 'unsafe-inline'`);
+	await next();
+});
+
+// Init router
+const router = new Router();
+
+router.get('/app-default.jpg', ctx => {
+	const file = fs.createReadStream(`${_dirname}/assets/dummy.png`);
+	ctx.body = file;
+	ctx.set('Content-Type', 'image/jpeg');
+	ctx.set('Cache-Control', 'max-age=31536000, immutable');
+});
+
+router.get('/:key', sendDriveFile);
+router.get('/:key/(.*)', sendDriveFile);
+
+// Register router
+app.use(router.routes());
+
+module.exports = app;