add commitment.ts

ts/src/commitment.ts

@@ -0,0 +1,29 @@
+import { ZkWasmServiceHelper, ZkWasmUtil } from "zkwasm-service-helper";
+
+export const endpoint = "https://rpc.zkwasmhub.com:8090";
+
+export function commitmentHexToHexString(x: string, y: string): string[] {
+    const hexString1 = "0x" + x.slice(12, 66);
+    const hexString2 = "0x" + y.slice(39) + "00000000000000000" + x.slice(2, 12);
+    const hexString3 = "0x" + y.slice(2, 39);
+    return [hexString1, hexString2, hexString3];
+}
+
+
+export async function getImageCommitmentHexStrings(imageHash: string): Promise<string[]> {
+    const helper = new ZkWasmServiceHelper(endpoint, "", "");
+    const imageInfo = await helper.queryImage(imageHash);
+
+    if (!imageInfo || !imageInfo.checksum) {
+        throw new Error(`Image not found: ${imageHash}`);
+    }
+
+    const { x, y } = imageInfo.checksum;
+    const xHexString = ZkWasmUtil.bytesToHexStrings(x);
+    const yHexString = ZkWasmUtil.bytesToHexStrings(y);
+
+    return commitmentHexToHexString(
+        "0x" + xHexString[0].slice(2).padStart(64, "0"),
+        "0x" + yHexString[0].slice(2).padStart(64, "0")
+    );
+}