Week7

Week7/project/.editorconfig

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+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.{js,json,yml}]
+charset = utf-8
+indent_style = space
+indent_size = 2

Week7/project/.gitignore

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+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
+
+# Swap the comments on the following lines if you don't wish to use zero-installs
+# Documentation here: https://yarnpkg.com/features/zero-installs
+!.yarn/cache
+#.pnp.*
+
+node_modules
+.env
+coverage
+coverage.json
+typechain
+typechain-types
+
+# Hardhat files
+cache
+artifacts
+

Week7/project/.mocharc.json

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+{
+    "require": "hardhat/register",
+    "timeout": 40000,
+    "_": ["tests/**/*.ts"]
+  }

Week7/project/.yarnrc.yml

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+nodeLinker: node-modules
+
+yarnPath: .yarn/releases/yarn-3.5.1.cjs

Week7/project/README.md

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+# Sample Hardhat Project
+
+This project demonstrates a basic Hardhat use case. It comes with a sample contract, a test for that contract, and a script that deploys that contract.
+
+Try running some of the following tasks:
+
+```shell
+npx hardhat help
+npx hardhat test
+REPORT_GAS=true npx hardhat test
+npx hardhat node
+npx hardhat run scripts/deploy.ts
+```

Week7/project/contracts/Ballot.sol

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+// SPDX-License-Identifier: GPL-3.0
+pragma solidity >=0.7.0 <0.9.0;
+/// @title Voting with delegation.
+contract Ballot {
+    // This declares a new complex type which will
+    // be used for variables later.
+    // It will represent a single voter.
+    struct Voter {
+        uint weight; // weight is accumulated by delegation
+        bool voted;  // if true, that person already voted
+        address delegate; // person delegated to
+        uint vote;   // index of the voted proposal
+    }
+
+    // This is a type for a single proposal.
+    struct Proposal {
+        bytes32 name;   // short name (up to 32 bytes)
+        uint voteCount; // number of accumulated votes
+    }
+
+    address public chairperson;
+
+    // This declares a state variable that
+    // stores a `Voter` struct for each possible address.
+    mapping(address => Voter) public voters;
+
+    // A dynamically-sized array of `Proposal` structs.
+    Proposal[] public proposals;
+
+    /// Create a new ballot to choose one of `proposalNames`.
+    constructor(bytes32[] memory proposalNames) {
+        chairperson = msg.sender;
+        voters[chairperson].weight = 1;
+
+        // For each of the provided proposal names,
+        // create a new proposal object and add it
+        // to the end of the array.
+        for (uint i = 0; i < proposalNames.length; i++) {
+            // `Proposal({...})` creates a temporary
+            // Proposal object and `proposals.push(...)`
+            // appends it to the end of `proposals`.
+            proposals.push(Proposal({
+                name: proposalNames[i],
+                voteCount: 0
+            }));
+        }
+    }
+
+    // Give `voter` the right to vote on this ballot.
+    // May only be called by `chairperson`.
+    function giveRightToVote(address voter) external {
+        // If the first argument of `require` evaluates
+        // to `false`, execution terminates and all
+        // changes to the state and to Ether balances
+        // are reverted.
+        // This used to consume all gas in old EVM versions, but
+        // not anymore.
+        // It is often a good idea to use `require` to check if
+        // functions are called correctly.
+        // As a second argument, you can also provide an
+        // explanation about what went wrong.
+        require(
+            msg.sender == chairperson,
+            "Only chairperson can give right to vote."
+        );
+        require(
+            !voters[voter].voted,
+            "The voter already voted."
+        );
+        require(voters[voter].weight == 0);
+        voters[voter].weight = 1;
+    }
+
+    /// Delegate your vote to the voter `to`.
+    function delegate(address to) external {
+        // assigns reference
+        Voter storage sender = voters[msg.sender];
+        require(sender.weight != 0, "You have no right to vote");
+        require(!sender.voted, "You already voted.");
+
+        require(to != msg.sender, "Self-delegation is disallowed.");
+
+        // Forward the delegation as long as
+        // `to` also delegated.
+        // In general, such loops are very dangerous,
+        // because if they run too long, they might
+        // need more gas than is available in a block.
+        // In this case, the delegation will not be executed,
+        // but in other situations, such loops might
+        // cause a contract to get "stuck" completely.
+        while (voters[to].delegate != address(0)) {
+            to = voters[to].delegate;
+
+            // We found a loop in the delegation, not allowed.
+            require(to != msg.sender, "Found loop in delegation.");
+        }
+
+        Voter storage delegate_ = voters[to];
+
+        // Voters cannot delegate to accounts that cannot vote.
+        require(delegate_.weight >= 1);
+
+        // Since `sender` is a reference, this
+        // modifies `voters[msg.sender]`.
+        sender.voted = true;
+        sender.delegate = to;
+
+        if (delegate_.voted) {
+            // If the delegate already voted,
+            // directly add to the number of votes
+            proposals[delegate_.vote].voteCount += sender.weight;
+        } else {
+            // If the delegate did not vote yet,
+            // add to her weight.
+            delegate_.weight += sender.weight;
+        }
+    }
+
+    /// Give your vote (including votes delegated to you)
+    /// to proposal `proposals[proposal].name`.
+    function vote(uint proposal) external {
+        Voter storage sender = voters[msg.sender];
+        require(sender.weight != 0, "Has no right to vote");
+        require(!sender.voted, "Already voted.");
+        sender.voted = true;
+        sender.vote = proposal;
+
+        // If `proposal` is out of the range of the array,
+        // this will throw automatically and revert all
+        // changes.
+        proposals[proposal].voteCount += sender.weight;
+    }
+
+    /// @dev Computes the winning proposal taking all
+    /// previous votes into account.
+    function winningProposal() public view
+            returns (uint winningProposal_)
+    {
+        uint winningVoteCount = 0;
+        for (uint p = 0; p < proposals.length; p++) {
+            if (proposals[p].voteCount > winningVoteCount) {
+                winningVoteCount = proposals[p].voteCount;
+                winningProposal_ = p;
+            }
+        }
+    }
+
+    // Calls winningProposal() function to get the index
+    // of the winner contained in the proposals array and then
+    // returns the name of the winner
+    function winnerName() external view
+            returns (bytes32 winnerName_)
+    {
+        winnerName_ = proposals[winningProposal()].name;
+    }
+}

Week7/project/hardhat.config.ts

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+import { HardhatUserConfig, task } from "hardhat/config";
+import "@nomicfoundation/hardhat-toolbox";
+
+task("accounts", "Prints the list of accounts", async (taskArgs, hre) => {
+  const accounts = await hre.ethers.getSigners();
+
+  for (const account of accounts) {
+    console.log(account.address);
+    console.log(await account.getBalance());
+  }
+});
+
+const config: HardhatUserConfig = {
+  solidity: "0.8.18",
+  paths: { tests: "tests" },
+};
+
+export default config;
+

Week7/project/package.json

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+{
+  "name": "project",
+  "packageManager": "[email protected]",
+  "devDependencies": {
+    "@nomicfoundation/hardhat-chai-matchers": "1.0.0",
+    "@nomicfoundation/hardhat-network-helpers": "1.0.0",
+    "@nomicfoundation/hardhat-toolbox": "2.0.0",
+    "@nomiclabs/hardhat-ethers": "2.0.0",
+    "@nomiclabs/hardhat-etherscan": "3.0.0",
+    "@types/chai": "^4.3.5",
+    "chai": "4.2.0",
+    "ethers": "5.4.7",
+    "hardhat": "^2.14.0",
+    "hardhat-gas-reporter": "1.0.8",
+    "mocha": "^10.2.0"
+  },
+  "dependencies": {
+    "@ethersproject/abi": "^5.7.0",
+    "@ethersproject/providers": "^5.7.2",
+    "@typechain/ethers-v5": "^10.2.0",
+    "@typechain/hardhat": "^6.1.5",
+    "@types/mocha": "^10.0.1",
+    "@types/node": "^18.16.3",
+    "solidity-coverage": "^0.8.2",
+    "ts-node": "^10.9.1",
+    "typechain": "^8.1.1",
+    "typescript": "^5.0.4"
+  }
+}

Week7/project/scripts/deploy.ts

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+import { ethers } from "hardhat";
+
+async function main() {
+  const currentTimestampInSeconds = Math.round(Date.now() / 1000);
+  const unlockTime = currentTimestampInSeconds + 60;
+
+  const lockedAmount = ethers.utils.parseEther("0.001");
+
+  const Lock = await ethers.getContractFactory("Lock");
+  const lock = await Lock.deploy(unlockTime, { value: lockedAmount });
+
+  await lock.deployed();
+
+  console.log(
+    `Lock with ${ethers.utils.formatEther(lockedAmount)}ETH and unlock timestamp ${unlockTime} deployed to ${lock.address}`
+  );
+}
+
+// We recommend this pattern to be able to use async/await everywhere
+// and properly handle errors.
+main().catch((error) => {
+  console.error(error);
+  process.exitCode = 1;
+});