Week 4 Solution done

9.1.0

@@ -0,0 +1,18 @@
+
+added 809 packages, and audited 845 packages in 2m
+
+143 packages are looking for funding
+  run `npm fund` for details
+
+57 vulnerabilities (35 low, 7 moderate, 9 high, 6 critical)
+
+To address issues that do not require attention, run:
+  npm audit fix
+
+To address all issues possible (including breaking changes), run:
+  npm audit fix --force
+
+Some issues need review, and may require choosing
+a different dependency.
+
+Run `npm audit` for details.

README.md

@@ -1,127 +1,13 @@
-# 📝 Assignment for Week 4: NFTs and the Metaverse
+# Sample Hardhat Project
 
-In this week's assignment, we will work on building a simple NFT contract, setting up Hardhat tasks, and creating test cases to ensure proper functionality. The tasks involve deploying, minting, and interacting with an NFT smart contract, which we'll build using OpenZeppelin and Hardhat.
+This project demonstrates a basic Hardhat use case. It comes with a sample contract, a test for that contract, and a Hardhat Ignition module that deploys that contract.
 
-## Exercise Breakdown
+Try running some of the following tasks:
 
-
-### Exercise 0 : Initialise your Hardhat project
-
-   ```
-   mkdir nft-project
-   cd nft-project
-   npx hardhat
-   ```
-
-make sure to use  `.env` file for sensetive info.
-
-
-#### IMPORTANT : The given files are just for helping purposes and giving idea of the structure of the project. 
-This repo contains  Demo codes for the files without the depandancies.
-
-### Exercise 1: Create Your Solidity Contract
-You will write a simple ERC721-based contract for minting NFTs using OpenZeppelin libraries.
-
-The contract file is located at:
-
-- [contracts/MyNFT.sol](contracts/MyNFT.sol)
-
-### Exercise 2: Create Hardhat Tasks for Deploying and Minting NFTs
-We will create tasks to deploy the NFT contract and mint NFTs using Hardhat.
-
-The task file is located at:
-
-- [tasks/nft.ts](tasks/nft.ts)
-
-### Exercise 3: Create Helpers
-The helpers for interacting with our contract and environment variables are implemented in the following files:
-
-- [lib/contract.ts](lib/contract.ts)
-- [lib/env.ts](lib/env.ts)
-- [lib/provider.ts](lib/provider.ts)
-- [lib/wallet.ts](lib/wallet.ts)
-
-### Exercise 4: Create Tests
-We will write unit and integration tests to validate the NFT contract functionality. The tests will check minting functionality and balance tracking.
-
-Test files:
-
-- [test/MyNFT.spec.ts](test/MyNFT.spec.ts) – Unit tests for the NFT contract.
-- [test/tasks.spec.ts](test/tasks.spec.ts) – Integration tests for Hardhat tasks.
-- [test/test-helpers.ts](test/test-helpers.ts) – Helpers used in the tests.
-
-### Exercise 5: Hardhat Configuration
-We will configure Hardhat to use the Alchemy API and connect to the Sepolia test network.
-
-Configuration file:
-
-- [hardhat.config.ts](hardhat.config.ts)
-
----
-
-## Useful Commands
-
-
-- Compile the smart contracts:
-
-   ```bash
-   npx hardhat compile
-   ```
-
--  Deploy the contract:
-
-   ```bash
-   npx hardhat deploy-contract
-   ```
-
-- Mint an NFT:
-
-   ```bash
-   npx hardhat mint-nft --tokenUri "https://example.com/token-metadata"
-   ```
-
----
-
-## Running Tests
-
-To run the test cases, execute:
-
-```bash
+```shell
+npx hardhat help
 npx hardhat test
+REPORT_GAS=true npx hardhat test
+npx hardhat node
+npx hardhat ignition deploy ./ignition/modules/Lock.js
 ```
-
-Example output:
-
-```
-mintNft
-  ✓ calls through and returns the transaction object (60ms)
-
-MyNFT
-  mintNft
-    ✓ emits the Transfer event (60ms)
-    ✓ returns the new item ID
-    ✓ increments the item ID (57ms)
-    ✓ cannot mint to address zero
-  balanceOf
-    ✓ gets the count of NFTs for this address
-
-6 passing (2s)
-✨  Done in 5.66s.
-```
-
----
-
-## Resources
-
-- [OpenZeppelin Documentation](https://docs.openzeppelin.com/)
-- [Hardhat Documentation](https://hardhat.org/getting-started/)
-
-## What to Submit
-
-- A link to your GitHub Pull Request with the implemented contract and tasks.
-
-- Head over to the Coursework submission link: [Google Form](https://docs.google.com/forms/d/e/1FAIpQLScspmFUymr7wMW9HxjwRSlSa1Zxnnj9H3LJK6Y9xsPeus-iCw/viewform?usp=sf_link) to submit your work.
-
-Inform your UniDAO lead once the submission has been made.
-
-Feel free to ask any questions or seek clarification on Discord.

contracts/Lock.sol

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+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.27;
+
+// Uncomment this line to use console.log
+// import "hardhat/console.sol";
+
+contract Lock {
+    uint public unlockTime;
+    address payable public owner;
+
+    event Withdrawal(uint amount, uint when);
+
+    constructor(uint _unlockTime) payable {
+        require(
+            block.timestamp < _unlockTime,
+            "Unlock time should be in the future"
+        );
+
+        unlockTime = _unlockTime;
+        owner = payable(msg.sender);
+    }
+
+    function withdraw() public {
+        // Uncomment this line, and the import of "hardhat/console.sol", to print a log in your terminal
+        // console.log("Unlock time is %o and block timestamp is %o", unlockTime, block.timestamp);
+
+        require(block.timestamp >= unlockTime, "You can't withdraw yet");
+        require(msg.sender == owner, "You aren't the owner");
+
+        emit Withdrawal(address(this).balance, block.timestamp);
+
+        owner.transfer(address(this).balance);
+    }
+}

contracts/MyNFT.sol

@@ -23,4 +23,4 @@ contract MyNFT is ERC721URIStorage {
 
         return newItemId;
     }
-}
+}

declarations.d.ts

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+declare module 'sinon';

hardhat.config.ts

@@ -1,22 +1,27 @@
-import("@nomiclabs/hardhat-ethers");
-import("@nomiclabs/hardhat-waffle");
-import dotenv from "dotenv";
-
-const argv = JSON.parse(env("npm_config_argv"));
-if (argv.original !== ["hardhat", "test"]) {
-  require('dotenv').config();
-}
-
-import("./tasks/nft");
-
 import { HardhatUserConfig } from "hardhat/config";
+import "@nomiclabs/hardhat-ethers";
+import "@nomiclabs/hardhat-waffle";
+import * as dotenv from "dotenv";
+import "./tasks/nft";  // Make sure tasks are correctly imported
+
+// Load environment variables
+dotenv.config();
 
 const config: HardhatUserConfig = {
-  solidity: "0.8.0",
+  solidity: {
+    compilers: [
+      {
+        version: "0.8.27", // Your main contract version
+      },
+      {
+        version: "0.8.1", // OpenZeppelin dependencies
+      },
+    ],
+  },
   networks: {
     sepolia: {
-      url: `https://eth-sepolia.alchemyapi.io/v2/${process.env.ALCHEMY_API_KEY}`,
-      accounts: [process.env.ETH_PRIVATE_KEY],
+      url: `https://eth-sepolia.g.alchemy.com/v2/${process.env.ALCHEMY_API_KEY}`,
+      accounts: process.env.ETH_PRIVATE_KEY ? [process.env.ETH_PRIVATE_KEY] : [],
     },
   },
 };

ignition/modules/Lock.js

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+// This setup uses Hardhat Ignition to manage smart contract deployments.
+// Learn more about it at https://hardhat.org/ignition
+
+const { buildModule } = require("@nomicfoundation/hardhat-ignition/modules");
+
+const JAN_1ST_2030 = 1893456000;
+const ONE_GWEI = 1_000_000_000n;
+
+module.exports = buildModule("LockModule", (m) => {
+  const unlockTime = m.getParameter("unlockTime", JAN_1ST_2030);
+  const lockedAmount = m.getParameter("lockedAmount", ONE_GWEI);
+
+  const lock = m.contract("Lock", [unlockTime], {
+    value: lockedAmount,
+  });
+
+  return { lock };
+});