opensea.ts

import { OpenSeaSDK, Chain, OrderSide } from "opensea-js";
import { SEPOLIA_CHAIN_ID, setupNearEthAdapter, sleep } from "./setup";
import * as readline from "readline";
import { ethers } from "ethers";
import { Address, Hex, encodeFunctionData } from "viem";
import seaportABI from "./abis/Seaport.json";

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
});

// This script uses the OpenSea SDK:
// https://github.com/ProjectOpenSea/opensea-js/blob/main/developerDocs/advanced-use-cases.md
const run = async (slug: string): Promise<void> => {
  const evm = await setupNearEthAdapter();
  // This fake provider is required to construct an openseaSDK instance (although we do not make use of it).
  const dummyProvider = new ethers.JsonRpcProvider("fakeURL", 11155111);
  const openseaSDK = new OpenSeaSDK(dummyProvider, {
    chain: Chain.Sepolia,
    // apiKey: YOUR_API_KEY,
  });
  // const slug = "mintbase-chain-abstraction-v2";

  console.log("Retrieving Listings for...");
  const listings = (await openseaSDK.api.getAllListings(slug)).listings;
  if (listings.length === 0) {
    console.log(`No available listings for collection: ${slug}`);
    return;
  }
  listings.sort((a, b) =>
    a.price.current.value.localeCompare(b.price.current.value)
  );
  const cheapestAvailable = listings[0];
  console.log(
    `Got ${listings.length} Listings, purchasing the cheapest available`
  );

  // This sleep is due to free-tier testnet rate limiting.
  await sleep(1000);
  const data = await openseaSDK.api.generateFulfillmentData(
    evm.address,
    cheapestAvailable.order_hash,
    cheapestAvailable.protocol_address,
    OrderSide.ASK
  );

  const tx = data.fulfillment_data.transaction;
  const input_data = tx.input_data;

  // TODO - report or fix these bugs with OpenseaSDK
  // @ts-expect-error: Undocumented field on type FulfillmentData within FulfillmentDataResponse
  const order = input_data.parameters;
  // @ts-expect-error: Undocumented field on type FulfillmentData within FulfillmentDataResponse
  const fulfillerConduitKey = input_data.fulfillerConduitKey;

  let callData = "0x";
  if (tx.function.includes("fulfillOrder")) {
    console.log("Using fulfillOrder");
    callData = encodeFunctionData({
      abi: seaportABI,
      functionName: "fulfillOrder",
      args: [order, fulfillerConduitKey],
    });
  } else {
    console.log("Using fulfillBasicOrder_efficient_6GL6yc");
    callData = encodeFunctionData({
      abi: seaportABI,
      functionName: "fulfillBasicOrder_efficient_6GL6yc",
      args: [order],
    });
  }
  await evm.signAndSendTransaction({
    to: tx.to as Address,
    value: BigInt(tx.value),
    data: callData as Hex,
    chainId: SEPOLIA_CHAIN_ID,
  });
};

rl.question("Provide collection slug: ", (input) => {
  run(input);
});