Add script to update nft metadata

Add utility to get applied validator from json file

off-chain/update-nft.ts

@@ -0,0 +1,60 @@
+import { Constr, Data, fromText, toUnit } from "lucid";
+import {
+  createLucidInstance,
+  getAppliedValidator,
+  getCredential,
+  getUtxoWithAssets,
+} from "./utils/lucid/utils.ts";
+import { REFERENCE_TOKEN_LABEL } from "./common/constants.ts";
+import { MetaDatum } from "./common/types.ts";
+
+const lucid = await createLucidInstance();
+lucid.selectWalletFromPrivateKey(await getCredential("issuer.sk"));
+
+const storeValidator = await getAppliedValidator("reference_store.store.json");
+const storeUtxos = await lucid.utxosAt(storeValidator.lockAddress);
+const mintValidator = await getAppliedValidator("mint.mint.json");
+
+const assetNameSuffix =
+  "004e80f65697e1332fbb75f5a4a0927f5856ade4df76b64bd762a2f6";
+const refToken = toUnit(
+  mintValidator.policyId,
+  assetNameSuffix,
+  REFERENCE_TOKEN_LABEL,
+);
+const refUtxo = getUtxoWithAssets(storeUtxos, { [refToken]: 1n });
+
+let metaDatum: MetaDatum;
+try {
+  metaDatum = Data.from<MetaDatum>(refUtxo.datum!, MetaDatum);
+  const metadata = metaDatum?.metadata;
+  metadata?.set(fromText("name"), fromText("BlockOwls Telly Updated"));
+  metadata?.set(fromText("power"), 1000n);
+} catch (error) {
+  console.error(
+    `Error occured while deserializing UTxO datum at refToken(${refToken} to MetaDatum. 
+    Datum: ${refUtxo.datum}` + error.message,
+  );
+}
+
+const rdmr = Data.to(new Constr(0, []));
+
+const tx = await lucid
+  .newTx()
+  .collectFrom([refUtxo], rdmr)
+  .payToContract(storeValidator.lockAddress, {
+    inline: Data.to<MetaDatum>(metaDatum!, MetaDatum),
+  }, { [refToken]: 1n })
+  .attachSpendingValidator(storeValidator.validator)
+  .addSigner(await lucid.wallet.address())
+  .complete();
+
+const signedTx = await tx.sign().complete();
+const txHash = await signedTx.submit();
+
+console.log(
+  `Successfully updated CIP-68 Reference NFT: ${refToken},
+  storeAddress: ${storeValidator.lockAddress},
+  token: ${mintValidator.policyId},
+  txHash: ${txHash}`,
+);

off-chain/utils/lucid/utils.ts

@@ -119,6 +119,14 @@ export function parseValidator(validators: any, title: string): Script {
   };
 }
 
+export async function getAppliedValidator(
+  validatorName: string,
+  filePath?: string,
+): Promise<AppliedValidator> {
+  const validatorPath = filePath ? filePath : APPLIED_VALIDATOR_PATH;
+  return JSON.parse(await Deno.readTextFile(validatorPath + validatorName));
+}
+
 export function parseValidatorAndApplyParameters(
   validators: any,
   params: Data[],