feat: implement caching for .ts files in HLS proxy middleware

server/middleware/proxy-m3u8.ts

@@ -1,3 +1,28 @@
+import { createHash } from 'crypto'
+import { useRedis } from '../utils/redis'
+
+const CACHE_TTL = 86400 // 1 ngày cho .ts files
+const CACHE_PREFIX = 'hls:'
+
+async function getCachedFile(redis: any, url: string): Promise<Buffer | null> {
+  const key = CACHE_PREFIX + createHash('md5').update(url).digest('hex')
+  try {
+    const cached = await redis.getBuffer(key)
+    return cached || null
+  } catch {
+    return null
+  }
+}
+
+async function setCachedFile(redis: any, url: string, data: Buffer): Promise<void> {
+  const key = CACHE_PREFIX + createHash('md5').update(url).digest('hex')
+  try {
+    await redis.set(key, data, 'EX', CACHE_TTL)
+  } catch {
+    // Ignore cache write errors
+  }
+}
+
 export default defineEventHandler(async (event) => {
   const path = event.path || event.node?.req?.url || ''
   
@@ -25,6 +50,22 @@ export default defineEventHandler(async (event) => {
   }
 
   try {
+    const isTsFile = url.includes('.ts')
+    const redis = useRedis()
+    
+    // Check cache for .ts files
+    if (isTsFile) {
+      const cached = await getCachedFile(redis, url)
+      if (cached) {
+        setHeader(event, 'access-control-allow-origin', '*')
+        setHeader(event, 'cache-control', 'public, max-age=31536000, immutable')
+        setHeader(event, 'content-type', 'video/mp2t')
+        setHeader(event, 'content-length', cached.length.toString())
+        setHeader(event, 'x-cache', 'HIT')
+        return cached
+      }
+    }
+
     const response = await fetch(url, {
       headers: {
         'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',
@@ -43,7 +84,6 @@ export default defineEventHandler(async (event) => {
 
     setHeader(event, 'access-control-allow-origin', '*')
     setHeader(event, 'access-control-allow-methods', 'GET, OPTIONS')
-    setHeader(event, 'cache-control', 'public, max-age=3600')
 
     if (isM3u8) {
       let body = await response.text()
@@ -64,13 +104,26 @@ export default defineEventHandler(async (event) => {
       })
       
       setHeader(event, 'content-type', 'application/vnd.apple.mpegurl')
+      setHeader(event, 'cache-control', 'public, max-age=300')
+      setHeader(event, 'x-cache', 'MISS')
       return body
+    } else if (isTsFile) {
+      // Cache .ts files in Redis
+      const buffer = Buffer.from(await response.arrayBuffer())
+      await setCachedFile(redis, url, buffer)
+      
+      setHeader(event, 'content-type', 'video/mp2t')
+      setHeader(event, 'cache-control', 'public, max-age=31536000, immutable')
+      setHeader(event, 'content-length', buffer.length.toString())
+      setHeader(event, 'x-cache', 'MISS')
+      return buffer
     } else {
       setHeader(event, 'content-type', contentType)
       const contentLength = response.headers.get('content-length')
       if (contentLength) {
         setHeader(event, 'content-length', contentLength)
       }
+      setHeader(event, 'cache-control', 'public, max-age=3600')
       return response.body
     }
   } catch (error: any) {