From 6c5bbfbd14ba1b8fe95bcbc82d9477b05e43ce0c Mon Sep 17 00:00:00 2001
From: rudaev <daniel@rudaev.co.il>
Date: Thu, 2 Apr 2026 19:18:08 +0700
Subject: [PATCH] fix(noweb): use stream mode for media download to fix 0-byte
 audio files

The 'buffer' mode in Baileys' downloadMediaMessage() silently returns
an empty buffer for audio/voice messages (PTT, OGG Opus), while images
download correctly. Switching to 'stream' mode and collecting chunks
manually resolves the issue.

Tested in production (WAHA Plus 2026.3.4, NOWEB engine, S3 storage):
- Before: voice messages saved as 0 bytes in S3
- After: voice messages saved with correct size (58,005 bytes confirmed)

Fixes #1996
---
 src/core/engines/noweb/session.noweb.core.ts | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/core/engines/noweb/session.noweb.core.ts b/src/core/engines/noweb/session.noweb.core.ts
index d5b850a9..56baedc6 100644
--- a/src/core/engines/noweb/session.noweb.core.ts
+++ b/src/core/engines/noweb/session.noweb.core.ts
@@ -2848,9 +2848,12 @@ export class NOWEBEngineMediaProcessor implements IMediaEngineProcessor<any> {
       content.url = null;
     }
 
-    return (await downloadMediaMessage(
+    // Use 'stream' mode instead of 'buffer' to fix 0-byte audio files
+    // 'buffer' mode silently returns empty buffer for audio/voice messages
+    // See: https://github.com/devlikeapro/waha/issues/1996
+    const stream = await downloadMediaMessage(
       message,
-      'buffer',
+      'stream',
       {},
       {
         logger: this.logger,
@@ -2859,7 +2862,12 @@ export class NOWEBEngineMediaProcessor implements IMediaEngineProcessor<any> {
     ).finally(() => {
       // Set url back in case we removed it
       content.url = url;
-    })) as Buffer;
+    });
+    const chunks: Buffer[] = [];
+    for await (const chunk of stream) {
+      chunks.push(chunk);
+    }
+    return Buffer.concat(chunks);
   }
 
   getFilename(message: any): string | null {