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security: check crypto.randomUUID availability in canMove

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This commit is contained in:
Dylan M. Taylor
2026-10-22 19:19:19 -04:00
parent 887fe3a3a8
commit 6871aa2236
1 changed files with 5 additions and 1 deletions
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apps/effectcraft-web/js/host.js
+5 -1
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@@ -494,7 +494,11 @@ export async function cacheRead(name) {
/// resolves with its size.
export async function cacheWrite(fullName, bytes) {
const [dir, name] = await entryDir(fullName);
const canMove = typeof FileSystemHandle !== "undefined" && "move" in FileSystemHandle.prototype;
const canMove =
typeof FileSystemHandle !== "undefined" &&
"move" in FileSystemHandle.prototype &&
typeof crypto !== "undefined" &&
typeof crypto.randomUUID === "function";
const tmp = canMove ? `${name}.tmp.${crypto.randomUUID()}` : name;
const fh = await dir.getFileHandle(tmp, { create: true });
if (fh.createSyncAccessHandle) {