use cacheKey in generating chunk hash

Author: aaronshaf

packages/idb-cache/src/index.ts

@@ -8,7 +8,6 @@ import type {
 import {
   generateChunkKey,
   openDatabase,
-  computeChunkHash,
   parseChunkIndexFromKey,
   getAllChunkKeysForBaseKey,
   deterministicUUID,
@@ -419,7 +418,9 @@ export class IDBCache implements AsyncStorage {
         const chunk = value.slice(i, i + this.chunkSize);
         const chunkIndex = Math.floor(i / this.chunkSize);
 
-        const chunkHash = await computeChunkHash(chunk, this.cacheBuster);
+        const chunkHash = await deterministicUUID(
+          `${this.cacheKey}:${this.cacheBuster}:${chunk}`
+        );
         const chunkKey = generateChunkKey(baseKey, chunkIndex, chunkHash);
         newChunkKeys.add(chunkKey);
 

packages/idb-cache/src/utils.ts

@@ -55,20 +55,6 @@ export function generateChunkKey(
   return `${baseKey}-chunk-${String(chunkIndex).padStart(6, "0")}-${chunkHash}`;
 }
 
-export async function computeChunkHash(
-  chunk: string,
-  cacheBuster: string
-): Promise<string> {
-  const encoder = new TextEncoder();
-  const data = encoder.encode(`${cacheBuster}:${chunk}`);
-  const hashBuffer = await crypto.subtle.digest("SHA-512", data);
-  const hashArray = Array.from(new Uint8Array(hashBuffer));
-  const hashHex = hashArray
-    .map((b) => b.toString(16).padStart(2, "0"))
-    .join("");
-  return generateUUIDFromHash(hashHex);
-}
-
 export function parseChunkIndexFromKey(chunkKey: string): number {
   const parts = chunkKey.split("-chunk-");
   if (parts.length < 2) return -1;