initial commit

src/lib/HashComputer.ts

@@ -0,0 +1,28 @@
+import { FileIDComputer } from "./fileID/FileIDComputer.js";
+import {CID_ALGORITHM_NAMES, ComputeInterface, MultiHashData} from "./MultiHashData.js";
+
+export class HashComputer implements ComputeInterface{
+    private fileIDComputer = new FileIDComputer();
+
+    constructor(private targetHash: CID_ALGORITHM_NAMES[]) {
+    }
+
+    async computeMissingHash(filePath: string, metadata: MultiHashData): Promise<void> {
+        // Dynamically determine which hashes are needed
+        const neededHashes = this.targetHash.filter(hashName => !metadata[hashName]);
+
+        // If all hashes are already computed, skip the processing
+        if (neededHashes.length === 0) {
+            return;
+        }
+
+        // Compute only the needed CIDs
+        const cids = await this.fileIDComputer.computeCIDs(filePath, neededHashes);
+
+        // Map the computed CIDs back to their respective metadata properties
+        cids.forEach((cid, index) => {
+            const hashType = neededHashes[index];
+            metadata[hashType] = cid;
+        });
+    }
+}