From 3e813ca2513ac02c15e819bc659ee8e63fd02b5c Mon Sep 17 00:00:00 2001
From: DebaucheryLibrarian <moonloop.adult@protonmail.com>
Date: Fri, 5 Feb 2021 03:13:10 +0100
Subject: [PATCH] Prevent writing to media hasher when hasher stream has
 closed.

---
 src/media.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/media.js b/src/media.js
index 05642a56..a6258360 100644
--- a/src/media.js
+++ b/src/media.js
@@ -504,10 +504,10 @@ async function fetchSource(source, baseMedia) {
 	const maxAttempts = source.attempts || 3;
 
 	logger.silly(`Fetching media from ${source.src}`);
-	// attempts
 
 	async function attempt(attempts = 1) {
 		const hasher = new blake2.Hash('blake2b', { digestLength: 24 });
+		let hasherReady = true;
 		hasher.setEncoding('hex');
 
 		try {
@@ -519,7 +519,10 @@ async function fetchSource(source, baseMedia) {
 
 			hashStream.on('data', (chunk) => {
 				size += chunk.length;
-				hasher.write(chunk);
+
+				if (hasherReady) {
+					hasher.write(chunk);
+				}
 			});
 
 			const { mimetype } = source.stream
@@ -551,6 +554,7 @@ async function fetchSource(source, baseMedia) {
 				},
 			};
 		} catch (error) {
+			hasherReady = false;
 			hasher.end();
 
 			if (error.code !== 'VERIFY_TYPE') {