From 2cca2719b38d9e8a59c174f3f00d8143e0a5a556 Mon Sep 17 00:00:00 2001
From: Caroline Larimore <caroline@larimo.re>
Date: Thu, 27 Nov 2025 14:34:10 -0800
Subject: feat: check client jar hash before re-downloading

---
 mcsh.sh | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/mcsh.sh b/mcsh.sh
index ed3092a..ad330dd 100755
--- a/mcsh.sh
+++ b/mcsh.sh
@@ -239,6 +239,7 @@ function update_version (
 				"asset_index": .assetIndex.url,
 				"java_version": .javaVersion.majorVersion,
 				"client_url": .downloads.client.url,
+				"client_hash": .downloads.client.sha1,
 				"main_class": .mainClass,
 				"logging_config": .logging.client.file.url
 			}
@@ -291,9 +292,13 @@ function update_version (
 	}
 	export -f download_asset
 
-	#TODO: check hash
 	version="$(<<<"$meta" jq -r '.version')"
-	if ! [[ -e "$VERSIONS_DIR/$version/client.jar" ]]; then
+	hash=""
+	if [[ -e "$VERSIONS_DIR/$version/client.jar" ]]; then
+		hash="$(sha1sum "$VERSIONS_DIR/$version/client.jar")"
+		hash="${hash%%[[:space:]]*}"
+	fi
+	if ! [[ "$hash" == "$(<<<"$meta" jq -r '.client_hash')" ]]; then
 		printf 'downloading %s client jar...\n' "$version" >&2
 		<<<"$meta" jq -r '.client_url' | xargs curl --silent -o "$VERSIONS_DIR/$version/client.jar"
 	fi
-- 
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