fix: download bunny materials through academy

server/src/providers/bunny-storage.ts

@@ -73,6 +73,29 @@ export async function uploadBunnyAsset(asset: StoredAsset) {
   return { key, assetUrl: `${cdnHost}/${key}` };
 }
 
+export function bunnyAssetKeyFromUrl(url: string) {
+  if (!config.BUNNY_STORAGE_CDN_HOST) return null;
+  const cdnHost = config.BUNNY_STORAGE_CDN_HOST.replace(/\/$/, '');
+  if (!url.startsWith(`${cdnHost}/materials/`)) return null;
+  const key = url.slice(cdnHost.length + 1);
+  return /^materials\/[0-9a-f-]{36}\.(?:pdf|docx|doc|xlsx|xls|csv|zip)$/i.test(key) ? key : null;
+}
+
+export async function downloadBunnyAsset(key: string) {
+  const { zone, password, endpoint } = bunnyStorageConfiguration();
+  const response = await fetch(`${endpoint}/${encodeURIComponent(zone)}/${key}`, {
+    headers: { AccessKey: password },
+  });
+  if (!response.ok) {
+    const detail = await response.text().catch(() => '');
+    throw new BunnyStorageRequestError(`Bunny Storage download failed (${response.status})${detail ? `: ${detail.slice(0, 250)}` : ''}`);
+  }
+  return {
+    body: Buffer.from(await response.arrayBuffer()),
+    contentType: response.headers.get('content-type') || 'application/octet-stream',
+  };
+}
+
 export async function downloadBunnyCover(filename: string) {
   const { zone, password, endpoint } = bunnyStorageConfiguration();
   const response = await fetch(`${endpoint}/${encodeURIComponent(zone)}/covers/${encodeURIComponent(filename)}`, {

server/src/routes/courses.ts

@@ -2,7 +2,7 @@ import type { FastifyPluginAsync } from 'fastify';
 import { z } from 'zod';
 import { pool } from '../db/pool.js';
 import { signedBunnyEmbedUrl, BunnyConfigurationError } from '../providers/bunny.js';
-import { BunnyStorageConfigurationError, BunnyStorageRequestError, downloadBunnyCover } from '../providers/bunny-storage.js';
+import { BunnyStorageConfigurationError, BunnyStorageRequestError, bunnyAssetKeyFromUrl, downloadBunnyAsset, downloadBunnyCover } from '../providers/bunny-storage.js';
 
 const paramsSchema = z.object({
   courseId: z.string().uuid(),
@@ -14,6 +14,7 @@ const playbackParamsSchema = z.object({
 const coverParamsSchema = z.object({
   filename: z.string().regex(/^[0-9a-f]{8}-[0-9a-f-]{27}\.(?:jpg|png|webp)$/i),
 });
+const assetParamsSchema = z.object({ assetId: z.string().uuid() });
 
 export const courseSelect = (publicOnly = false, includeUnreadyMedia = false) => `
   select
@@ -133,6 +134,36 @@ export const courseRoutes: FastifyPluginAsync = async (app) => {
     }
   });
 
+  app.get('/assets/:assetId/download', { preHandler: app.authenticate }, async (request, reply) => {
+    const { assetId } = assetParamsSchema.parse(request.params);
+    const result = await pool.query<{ name: string; url: string; status: string; instructor_id: string }>(
+      `select a.name, a.url, c.status, c.instructor_id
+         from assets a
+         join courses c on c.id = coalesce(a.course_id, (select lesson.course_id from lessons lesson where lesson.id = a.lesson_id))
+        where a.id = $1`,
+      [assetId],
+    );
+    const asset = result.rows[0];
+    if (!asset || (asset.status !== 'published' && request.user.role !== 'admin' && asset.instructor_id !== request.user.id)) {
+      return reply.code(404).send({ error: 'Material não encontrado.' });
+    }
+    const key = bunnyAssetKeyFromUrl(asset.url);
+    if (!key) return reply.redirect(asset.url);
+    try {
+      const file = await downloadBunnyAsset(key);
+      const filename = asset.name.replace(/[\\/\r\n"]/g, '_');
+      reply.header('Content-Type', file.contentType);
+      reply.header('Content-Disposition', `attachment; filename="${filename}"; filename*=UTF-8''${encodeURIComponent(filename)}`);
+      reply.header('Cache-Control', 'private, no-store');
+      return reply.send(file.body);
+    } catch (error) {
+      if (error instanceof BunnyStorageConfigurationError || error instanceof BunnyStorageRequestError) {
+        return reply.code(404).send({ error: 'Material não encontrado.' });
+      }
+      throw error;
+    }
+  });
+
   app.get('/', async (request) => {
     const authenticated = await hasSession(request);
     const result = await pool.query(