diff --git a/migrations/1_initial_migration.js b/migrations/1_initial_migration.js index ee2135d29..a664edda6 100644 --- a/migrations/1_initial_migration.js +++ b/migrations/1_initial_migration.js @@ -2,4 +2,4 @@ const Migrations = artifacts.require("Migrations"); module.exports = function(deployer) { deployer.deploy(Migrations); -}; +}; \ No newline at end of file diff --git a/migrations/2_deploy_contracts.js b/migrations/2_deploy_contracts.js new file mode 100644 index 000000000..f481958e2 --- /dev/null +++ b/migrations/2_deploy_contracts.js @@ -0,0 +1,15 @@ +const Token = artifacts.require("Token"); +const EthSwap = artifacts.require("EthSwap"); + +module.exports = async function(deployer) { + //deploy Token + await deployer.deploy(Token); + const token = await Token.deployed(); + + //deploy EthSwap + await deployer.deploy(EthSwap, token.address); + const ethSwap = await EthSwap.deployed(); + + //transfer all tokens to EthSwap (1 million) + token.transfer(ethSwap.address, "1000000000000000000000000"); +}; diff --git a/package.json b/package.json index 6c1ffc537..37642031e 100644 --- a/package.json +++ b/package.json @@ -1,7 +1,7 @@ { - "name": "eth-marketplace", + "name": "eth-swap", "version": "0.1.0", - "description": "An Ethereum Marketplace", + "description": "An instant ERC20 crypto exchange", "author": "gregory@dappuniversity.com", "dependencies": { "babel-polyfill": "6.26.0", @@ -14,11 +14,12 @@ "chai": "4.2.0", "chai-as-promised": "7.1.1", "chai-bignumber": "3.0.0", + "identicon.js": "^2.3.3", "react": "16.8.4", "react-bootstrap": "1.0.0-beta.5", "react-dom": "16.8.4", "react-scripts": "2.1.3", - "truffle": "5.0.5", + "truffle": "^5.1.66", "web3": "1.0.0-beta.55" }, "scripts": { diff --git a/src/abis/EthSwap.json b/src/abis/EthSwap.json new file mode 100644 index 000000000..5a3da3f53 --- /dev/null +++ b/src/abis/EthSwap.json @@ -0,0 +1,4259 @@ +{ + "contractName": "EthSwap", + "abi": [ + { + "inputs": [ + { + "internalType": "contract Token", + "name": "_token", + "type": "address" + } + ], + "payable": false, + "stateMutability": "nonpayable", + "type": "constructor" + }, + { + "anonymous": false, + "inputs": [ + { + "indexed": false, + "internalType": "address", + "name": "account", + "type": "address" + }, + { + "indexed": false, + "internalType": "address", + "name": "token", + "type": "address" + }, + { + "indexed": false, + "internalType": "uint256", + "name": "amount", + "type": "uint256" + }, + { + "indexed": false, + "internalType": "uint256", + "name": "rate", + "type": "uint256" + } + ], + "name": "TokensPurchase", + "type": "event" + }, + { + "anonymous": false, + "inputs": [ + { + "indexed": false, + "internalType": "address", + "name": "account", + "type": "address" + }, + { + "indexed": false, + "internalType": "address", + "name": "token", + "type": "address" + }, + { + "indexed": false, + "internalType": "uint256", + "name": "amount", + "type": "uint256" + }, + { + "indexed": false, + "internalType": "uint256", + "name": "rate", + "type": "uint256" + } + ], + "name": "TokensSold", + "type": "event" + }, + { + "constant": true, + "inputs": [], + "name": "name", + "outputs": [ + { + "internalType": "string", + "name": "", + "type": "string" + } + ], + "payable": false, + "stateMutability": "view", + "type": "function" + }, + { + "constant": true, + "inputs": [], + "name": "token", + "outputs": [ + { + "internalType": "contract Token", + "name": "", + "type": "address" + } + ], + "payable": false, + "stateMutability": "view", + "type": "function" + }, + { + "constant": false, + "inputs": [], + "name": "buyTokens", + "outputs": [], + "payable": true, + "stateMutability": "payable", + "type": "function" + }, + { + "constant": false, + "inputs": [ + { + "internalType": "uint256", + "name": "_amount", + "type": "uint256" + } + ], + "name": "sellTokens", + "outputs": [], + "payable": false, + "stateMutability": "nonpayable", + "type": "function" + } + ], + "metadata": "{\"compiler\":{\"version\":\"0.5.16+commit.9c3226ce\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"contract Token\",\"name\":\"_token\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"address\",\"name\":\"token\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"rate\",\"type\":\"uint256\"}],\"name\":\"TokensPurchase\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"address\",\"name\":\"token\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"rate\",\"type\":\"uint256\"}],\"name\":\"TokensSold\",\"type\":\"event\"},{\"constant\":false,\"inputs\":[],\"name\":\"buyTokens\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"_amount\",\"type\":\"uint256\"}],\"name\":\"sellTokens\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"token\",\"outputs\":[{\"internalType\":\"contract 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+ "source": "pragma solidity ^0.5.0;\n\nimport \"./Token.sol\";\n\ncontract EthSwap {\n string public name = \"EthSwap Instants exchange\";\n Token public token;\n uint256 rate = 100;\n event TokensPurchase(\n address account,\n address token,\n uint256 amount,\n uint256 rate\n );\n\n event TokensSold(\n address account,\n address token,\n uint256 amount,\n uint256 rate\n );\n\n constructor(Token _token) public {\n token = _token;\n }\n\n function buyTokens() public payable {\n //calculate the number of tokens to buy\n uint256 tokenAmount = rate * msg.value;\n \n // requires that EthSwap has enough tokens\n require(token.balanceOf(address(this)) >= tokenAmount);// note the 'this' refferences the contract address (ie EthSwap address)\n \n //transfer token to user\n token.transfer(msg.sender, tokenAmount);\n \n //Emit an event\n emit TokensPurchase(msg.sender, address(token), tokenAmount, rate);\n }\n \n function sellTokens(uint _amount) public {\n // users can't sell more tokens than they have\n require(token.balanceOf(msg.sender) >= _amount);\n //calculate the number of ether to redeem\n uint256 etheAmount = _amount / rate;\n \n // requires that EthSwap has enough ethers\n require(address(this).balance >= etheAmount);// note the 'this' refferences the contract address (ie EthSwap address)\n \n //transfer token to user\n token.transferFrom(msg.sender, address(this), _amount);\n msg.sender.transfer(etheAmount);\n\n //Emit an event\n emit TokensSold(msg.sender, address(token), _amount, rate);\n }\n}\n", + "sourcePath": "/Users/Izuking/Desktop/solidity_practice/eth_swap/src/contracts/EthSwap.sol", + "ast": { + "absolutePath": "/Users/Izuking/Desktop/solidity_practice/eth_swap/src/contracts/EthSwap.sol", + "exportedSymbols": { + "EthSwap": [ + 141 + ] + }, + "id": 142, + "nodeType": "SourceUnit", + "nodes": [ + { + "id": 1, + "literals": [ + "solidity", + "^", + "0.5", + ".0" + ], + "nodeType": "PragmaDirective", + "src": "0:23:0" + }, + { + "absolutePath": 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+ "source": "pragma solidity ^0.5.0;\n\ncontract Token {\n string public name = \"DApp Token\";\n string public symbol = \"DAPP\";\n uint256 public totalSupply = 1000000000000000000000000; // 1 million tokens\n uint8 public decimals = 18;\n\n event Transfer(\n address indexed _from,\n address indexed _to,\n uint256 _value\n );\n\n event Approval(\n address indexed _owner,\n address indexed _spender,\n uint256 _value\n );\n\n mapping(address => uint256) public balanceOf;\n mapping(address => mapping(address => uint256)) public allowance;\n\n constructor() public {\n balanceOf[msg.sender] = totalSupply;\n }\n\n function transfer(address _to, uint256 _value) public returns (bool success) {\n require(balanceOf[msg.sender] >= _value);\n balanceOf[msg.sender] -= _value;\n balanceOf[_to] += _value;\n emit Transfer(msg.sender, _to, _value);\n return true;\n }\n\n function approve(address _spender, uint256 _value) public returns (bool success) {\n allowance[msg.sender][_spender] = _value;\n emit Approval(msg.sender, _spender, _value);\n return true;\n }\n\n function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {\n require(_value <= balanceOf[_from]);\n require(_value <= allowance[_from][msg.sender]);\n balanceOf[_from] -= _value;\n balanceOf[_to] += _value;\n allowance[_from][msg.sender] -= _value;\n emit Transfer(_from, _to, _value);\n return true;\n }\n}", + "sourcePath": "/Users/Izuking/Desktop/solidity_practice/eth_swap/src/contracts/Token.sol", + "ast": { + "absolutePath": "/Users/Izuking/Desktop/solidity_practice/eth_swap/src/contracts/Token.sol", + "exportedSymbols": { + "Token": [ + 379 + ] + }, + "id": 380, + "nodeType": "SourceUnit", + "nodes": [ + { + "id": 200, + "literals": [ + "solidity", + "^", + "0.5", + ".0" + ], + "nodeType": "PragmaDirective", + "src": "0:23:2" + }, + { + "baseContracts": [], + "contractDependencies": [], + "contractKind": "contract", + "documentation": null, + "fullyImplemented": true, + "id": 379, + "linearizedBaseContracts": [ + 379 + ], + "name": "Token", + "nodeType": "ContractDefinition", + "nodes": [ + { + "constant": false, + "id": 203, + "name": "name", + "nodeType": "VariableDeclaration", + "scope": 379, + "src": "46:34:2", + "stateVariable": true, + "storageLocation": "default", + "typeDescriptions": { + "typeIdentifier": "t_string_storage", + "typeString": "string" + }, + "typeName": { + "id": 201, + "name": "string", + "nodeType": "ElementaryTypeName", + "src": "46:6:2", + "typeDescriptions": { + "typeIdentifier": "t_string_storage_ptr", + "typeString": "string" + } + }, + "value": { + "argumentTypes": null, + "hexValue": "4441707020546f6b656e", + "id": 202, + "isConstant": false, + "isLValue": false, + "isPure": true, + "kind": "string", + "lValueRequested": false, + "nodeType": "Literal", + "src": "68:12:2", + "subdenomination": null, + "typeDescriptions": { + "typeIdentifier": "t_stringliteral_4bb1c77e58fe7915ae82d4848a9c7f3a9bd772743e283b0e9e22385825f37dce", + "typeString": "literal_string \"DApp Token\"" + }, + "value": "DApp Token" + }, + "visibility": "public" + }, + { + "constant": false, + "id": 206, + "name": "symbol", + "nodeType": "VariableDeclaration", + "scope": 379, + "src": "86:30:2", + "stateVariable": true, + "storageLocation": "default", + "typeDescriptions": { + "typeIdentifier": "t_string_storage", + "typeString": "string" + }, + "typeName": { + "id": 204, + "name": "string", + "nodeType": "ElementaryTypeName", + "src": "86:6:2", + "typeDescriptions": { + "typeIdentifier": "t_string_storage_ptr", + "typeString": "string" + } + }, + "value": { + "argumentTypes": null, + "hexValue": "44415050", + "id": 205, + "isConstant": false, + "isLValue": false, + "isPure": true, + "kind": "string", + "lValueRequested": false, + "nodeType": "Literal", + "src": "110:6:2", + "subdenomination": null, + "typeDescriptions": { + "typeIdentifier": "t_stringliteral_2f0440134a0794b969e8c19364bb3c2fbe91c99bfae2a18a4a19e46c2cead377", + "typeString": "literal_string \"DAPP\"" + }, + "value": "DAPP" + }, + "visibility": "public" + }, + { + "constant": false, + "id": 209, + "name": "totalSupply", + "nodeType": "VariableDeclaration", + "scope": 379, + "src": "122:54:2", + "stateVariable": true, + "storageLocation": "default", + "typeDescriptions": { + "typeIdentifier": "t_uint256", + "typeString": "uint256" + }, + "typeName": { + "id": 207, + "name": "uint256", + "nodeType": "ElementaryTypeName", + "src": "122:7:2", + "typeDescriptions": { + "typeIdentifier": "t_uint256", + "typeString": "uint256" + } + }, + "value": { + "argumentTypes": null, + "hexValue": "31303030303030303030303030303030303030303030303030", + "id": 208, + "isConstant": false, + "isLValue": false, + "isPure": true, + "kind": "number", + "lValueRequested": false, + "nodeType": "Literal", + "src": "151:25:2", + "subdenomination": null, + "typeDescriptions": { + "typeIdentifier": "t_rational_1000000000000000000000000_by_1", + "typeString": "int_const 1000000000000000000000000" + }, + "value": "1000000000000000000000000" + }, + "visibility": "public" + }, + { + "constant": false, + "id": 212, + "name": "decimals", + "nodeType": "VariableDeclaration", + "scope": 379, + "src": "202:28:2", + "stateVariable": true, + "storageLocation": "default", + "typeDescriptions": { + "typeIdentifier": "t_uint8", + "typeString": "uint8" + }, + "typeName": { + "id": 210, + "name": "uint8", + "nodeType": "ElementaryTypeName", + "src": "202:5:2", + "typeDescriptions": { + "typeIdentifier": "t_uint8", + "typeString": "uint8" + } + }, + "value": { + "argumentTypes": null, + "hexValue": "3138", + "id": 211, + "isConstant": false, + "isLValue": false, + "isPure": true, + "kind": "number", + "lValueRequested": false, + "nodeType": "Literal", + "src": "228:2:2", + "subdenomination": null, + "typeDescriptions": { + "typeIdentifier": "t_rational_18_by_1", + "typeString": "int_const 18" + }, + "value": "18" + }, + "visibility": "public" + }, + { + "anonymous": false, + "documentation": null, + "id": 220, + "name": "Transfer", + "nodeType": "EventDefinition", + "parameters": { + "id": 219, + "nodeType": "ParameterList", + "parameters": [ + { + "constant": false, + "id": 214, + "indexed": true, + "name": "_from", + "nodeType": "VariableDeclaration", + "scope": 220, + "src": "261:21:2", + "stateVariable": false, + "storageLocation": "default", + "typeDescriptions": { + "typeIdentifier": "t_address", + "typeString": "address" + }, + "typeName": { + "id": 213, + "name": "address", + "nodeType": "ElementaryTypeName", + "src": "261:7:2", + "stateMutability": "nonpayable", + "typeDescriptions": { + "typeIdentifier": "t_address", + "typeString": "address" + } + }, + "value": null, + "visibility": "internal" + }, + { + "constant": false, + "id": 216, + "indexed": true, + "name": "_to", + "nodeType": "VariableDeclaration", + "scope": 220, + "src": "292:19:2", + "stateVariable": false, + "storageLocation": "default", + "typeDescriptions": { + "typeIdentifier": "t_address", + "typeString": "address" + }, + "typeName": { + "id": 215, + "name": "address", + "nodeType": "ElementaryTypeName", + "src": "292:7:2", + "stateMutability": "nonpayable", + "typeDescriptions": { + "typeIdentifier": "t_address", + "typeString": "address" + } + }, + "value": null, + "visibility": "internal" + }, + { + "constant": false, + "id": 218, + "indexed": false, + "name": "_value", + "nodeType": "VariableDeclaration", + "scope": 220, + "src": "321:14:2", + "stateVariable": false, + "storageLocation": "default", + "typeDescriptions": { + "typeIdentifier": "t_uint256", + "typeString": "uint256" + }, + "typeName": { + "id": 217, + "name": "uint256", + "nodeType": "ElementaryTypeName", + "src": "321:7:2", + "typeDescriptions": { + "typeIdentifier": "t_uint256", + "typeString": "uint256" + } + }, + "value": null, + "visibility": "internal" + } + ], + "src": "251:90:2" + }, + "src": "237:105:2" + }, + { + "anonymous": false, + "documentation": null, + "id": 228, + "name": "Approval", + "nodeType": "EventDefinition", + "parameters": { + "id": 227, + "nodeType": "ParameterList", + "parameters": [ + { + "constant": false, + "id": 222, + "indexed": true, + "name": "_owner", + "nodeType": "VariableDeclaration", + "scope": 228, + "src": "372:22:2", + "stateVariable": false, + "storageLocation": "default", + "typeDescriptions": { + "typeIdentifier": "t_address", + "typeString": "address" + }, + "typeName": { + "id": 221, + "name": "address", + "nodeType": "ElementaryTypeName", + "src": "372:7:2", + "stateMutability": "nonpayable", + "typeDescriptions": { + "typeIdentifier": "t_address", + "typeString": "address" + } + }, + "value": null, + "visibility": "internal" + }, + { + "constant": false, + "id": 224, + "indexed": true, + "name": "_spender", + "nodeType": "VariableDeclaration", + "scope": 228, + "src": "404:24:2", + "stateVariable": false, + "storageLocation": "default", + "typeDescriptions": { + "typeIdentifier": "t_address", + "typeString": "address" + }, + "typeName": { + "id": 223, + "name": "address", + "nodeType": "ElementaryTypeName", + "src": "404:7:2", + "stateMutability": "nonpayable", + "typeDescriptions": { + "typeIdentifier": "t_address", + "typeString": "address" + } + }, + "value": null, + "visibility": "internal" + }, + { + "constant": false, + "id": 226, + "indexed": false, + "name": "_value", + "nodeType": "VariableDeclaration", + "scope": 228, + "src": "438:14:2", + "stateVariable": false, + "storageLocation": "default", + "typeDescriptions": { + "typeIdentifier": "t_uint256", + "typeString": "uint256" + }, + "typeName": { + "id": 225, + "name": "uint256", + "nodeType": "ElementaryTypeName", + "src": "438:7:2", + "typeDescriptions": { + "typeIdentifier": "t_uint256", + "typeString": "uint256" + } + }, + "value": null, + "visibility": "internal" + } + ], + "src": "362:96:2" + }, + "src": "348:111:2" + }, + { + "constant": false, + "id": 232, + "name": "balanceOf", + "nodeType": 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"internalType": "address", + "name": "_from", + "type": "address" + }, + { + "indexed": true, + "internalType": "address", + "name": "_to", + "type": "address" + }, + { + "indexed": false, + "internalType": "uint256", + "name": "_value", + "type": "uint256" + } + ], + "name": "Transfer", + "type": "event" + } + }, + "links": {}, + "address": "0x26B17441cF82809Aeb93634720D640f4ce364B78", + "transactionHash": "0x24f0621d93503359995b7aab948edc8df0fb55db667cd0313445fb57f38c8801" + } + }, + "schemaVersion": "3.3.4", + "updatedAt": "2021-02-21T16:03:22.180Z", + "networkType": "ethereum", + "devdoc": { + "methods": {} + }, + "userdoc": { + "methods": {} + } +} \ No newline at end of file diff --git a/src/components/App.js b/src/components/App.js index 588f6251f..37aa38887 100755 --- a/src/components/App.js +++ b/src/components/App.js @@ -1,51 +1,145 @@ -import React, { Component } from 'react'; -import logo from '../logo.png'; -import './App.css'; - -class App extends Component { - render() { - return ( -
- -
-
-
-
- - logo - -

Dapp University Starter Kit

-

- Edit src/components/App.js and save to reload. -

- - LEARN BLOCKCHAIN NOW! - -
-
-
+
+ + {content} +
+
- ); - } -} + + ); +}; export default App; diff --git a/src/components/BuyForm.js b/src/components/BuyForm.js new file mode 100644 index 000000000..e9dd47a37 --- /dev/null +++ b/src/components/BuyForm.js @@ -0,0 +1,79 @@ +import React, { useRef, useState } from "react"; +import tokenLogo from "../token-logo.png"; +import ethLogo from "../eth-logo.png"; + +function BuyForm(props) { + const ref = useRef({ input: null }); + const [state, setState] = useState({ input: "0" }); + + return ( +
{ + event.preventDefault(); + let etherAmount; + etherAmount = ref.current.input.value.toString(); + etherAmount = window.web3.utils.toWei(etherAmount, "Ether"); + props.buyTokens(etherAmount); + }} + > +
+ + + Balance: {window.web3.utils.fromWei(props.ethBalance, "Ether")} + +
+
+ { + const etherAmount = ref.current.input.value.toString(); + setState({ ...state, output: etherAmount * 100 }); + }} + ref={(input) => { + ref.current.input = input; + }} + className="form-control form-control-lg" + placeholder="0" + required + /> +
+ +
    ETH
+
+
+
+ + + Balance: {window.web3.utils.fromWei(props.tokenBalance, "Ether")} + +
+
+ +
+ +
  DApp
+
+
+
+ Exchange Rate + 1 ETH = 100 DApp +
+ +
+ ); +} + +export default BuyForm; diff --git a/src/components/Main.js b/src/components/Main.js new file mode 100644 index 000000000..985a6b0f1 --- /dev/null +++ b/src/components/Main.js @@ -0,0 +1,56 @@ +import React, { useState, useRef } from "react"; +import BuyForm from "./BuyForm"; +import SellForm from "./SellForm"; + +function Main(props) { + const [state, setState] = useState({ currentForm: "buy" }); + + let content; + if (state.currentForm === "buy") { + content = ( + + ); + } else { + content = ( + + ); + } + + return ( +
+
+ + <   > + +
+ +
+
{content}
+
+
+ ); +} + +export default Main; diff --git a/src/components/Navbar.js b/src/components/Navbar.js new file mode 100644 index 000000000..3e30443ca --- /dev/null +++ b/src/components/Navbar.js @@ -0,0 +1,38 @@ +import React from 'react' +import Identicon from 'identicon.js'; +function Navbar(props) { + return ( + + ) +} + +export default Navbar diff --git a/src/components/SellForm.js b/src/components/SellForm.js new file mode 100644 index 000000000..bcaff97cc --- /dev/null +++ b/src/components/SellForm.js @@ -0,0 +1,85 @@ +import React, { useRef, useState } from "react"; +import tokenLogo from "../token-logo.png"; +import ethLogo from "../eth-logo.png"; + +function SellForm(props) { + const ref = useRef({ input: null }); + const [state, setState] = useState({ input: "0" }); + + return ( +
{ + event.preventDefault(); + let etherAmount; + etherAmount = ref.current.input.value.toString(); + etherAmount = window.web3.utils.toWei(etherAmount, "Ether"); + props.sellTokens(etherAmount); + }} + > +
+ + + Balance: {window.web3.utils.fromWei(props.tokenBalance, "Ether")} + +
+
+ { + const tokenAmount = ref.current.input.value.toString(); + setState({ + output: tokenAmount / 100, + }); + }} + ref={(input) => { + ref.current.input = input; + }} + className="form-control form-control-lg" + placeholder="0" + required + /> +
+
+ +   DApp +
+
+
+
+ + + Balance: {window.web3.utils.fromWei(props.ethBalance, "Ether")} + +
+
+ +
+
+ +     ETH +
+
+
+
+ Exchange Rate + 100 DApp = 1 ETH +
+ +
+ ); +} + +export default SellForm; diff --git a/src/contracts/EthSwap.sol b/src/contracts/EthSwap.sol new file mode 100644 index 000000000..b1c5d9a85 --- /dev/null +++ b/src/contracts/EthSwap.sol @@ -0,0 +1,57 @@ +pragma solidity ^0.5.0; + +import "./Token.sol"; + +contract EthSwap { + string public name = "EthSwap Instants exchange"; + Token public token; + uint256 rate = 100; + event TokensPurchase( + address account, + address token, + uint256 amount, + uint256 rate + ); + + event TokensSold( + address account, + address token, + uint256 amount, + uint256 rate + ); + + constructor(Token _token) public { + token = _token; + } + + function buyTokens() public payable { + //calculate the number of tokens to buy + uint256 tokenAmount = rate * msg.value; + + // requires that EthSwap has enough tokens + require(token.balanceOf(address(this)) >= tokenAmount);// note the 'this' refferences the contract address (ie EthSwap address) + + //transfer token to user + token.transfer(msg.sender, tokenAmount); + + //Emit an event + emit TokensPurchase(msg.sender, address(token), tokenAmount, rate); + } + + function sellTokens(uint _amount) public { + // users can't sell more tokens than they have + require(token.balanceOf(msg.sender) >= _amount); + //calculate the number of ether to redeem + uint256 etheAmount = _amount / rate; + + // requires that EthSwap has enough ethers + require(address(this).balance >= etheAmount);// note the 'this' refferences the contract address (ie EthSwap address) + + //transfer token to user + token.transferFrom(msg.sender, address(this), _amount); + msg.sender.transfer(etheAmount); + + //Emit an event + emit TokensSold(msg.sender, address(token), _amount, rate); + } +} diff --git a/src/contracts/Migrations.sol b/src/contracts/Migrations.sol index c378ffb02..74ecda2f0 100644 --- a/src/contracts/Migrations.sol +++ b/src/contracts/Migrations.sol @@ -1,23 +1,23 @@ pragma solidity >=0.4.21 <0.6.0; contract Migrations { - address public owner; - uint public last_completed_migration; + address public owner; + uint256 public last_completed_migration; - constructor() public { - owner = msg.sender; - } + constructor() public { + owner = msg.sender; + } - modifier restricted() { - if (msg.sender == owner) _; - } + modifier restricted() { + if (msg.sender == owner) _; + } - function setCompleted(uint completed) public restricted { - last_completed_migration = completed; - } + function setCompleted(uint256 completed) public restricted { + last_completed_migration = completed; + } - function upgrade(address new_address) public restricted { - Migrations upgraded = Migrations(new_address); - upgraded.setCompleted(last_completed_migration); - } + function upgrade(address new_address) public restricted { + Migrations upgraded = Migrations(new_address); + upgraded.setCompleted(last_completed_migration); + } } diff --git a/src/contracts/Token.sol b/src/contracts/Token.sol new file mode 100644 index 000000000..0c99ffdf1 --- /dev/null +++ b/src/contracts/Token.sol @@ -0,0 +1,51 @@ +pragma solidity ^0.5.0; + +contract Token { + string public name = "DApp Token"; + string public symbol = "DAPP"; + uint256 public totalSupply = 1000000000000000000000000; // 1 million tokens + uint8 public decimals = 18; + + event Transfer( + address indexed _from, + address indexed _to, + uint256 _value + ); + + event Approval( + address indexed _owner, + address indexed _spender, + uint256 _value + ); + + mapping(address => uint256) public balanceOf; + mapping(address => mapping(address => uint256)) public allowance; + + constructor() public { + balanceOf[msg.sender] = totalSupply; + } + + function transfer(address _to, uint256 _value) public returns (bool success) { + require(balanceOf[msg.sender] >= _value); + balanceOf[msg.sender] -= _value; + balanceOf[_to] += _value; + emit Transfer(msg.sender, _to, _value); + return true; + } + + function approve(address _spender, uint256 _value) public returns (bool success) { + allowance[msg.sender][_spender] = _value; + emit Approval(msg.sender, _spender, _value); + return true; + } + + function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) { + require(_value <= balanceOf[_from]); + require(_value <= allowance[_from][msg.sender]); + balanceOf[_from] -= _value; + balanceOf[_to] += _value; + allowance[_from][msg.sender] -= _value; + emit Transfer(_from, _to, _value); + return true; + } +} \ No newline at end of file diff --git a/src/eth-logo.png b/src/eth-logo.png new file mode 100644 index 000000000..b5fe9f6b8 Binary files /dev/null and b/src/eth-logo.png differ diff --git a/src/token-logo.png b/src/token-logo.png new file mode 100644 index 000000000..67fbf18b3 Binary files /dev/null and b/src/token-logo.png differ diff --git a/test/ethSwap.test.js b/test/ethSwap.test.js new file mode 100644 index 000000000..f7273cbfa --- /dev/null +++ b/test/ethSwap.test.js @@ -0,0 +1,92 @@ +const Token = artifacts.require("Token"); +const EthSwap = artifacts.require("EthSwap"); + +require("chai") + .use(require("chai-as-promised")) + .should(); + +function etherToWei(n) { + return web3.utils.toWei(n, "ether"); +} + +contract("EthSwap", ([deployer, investor]) => { + let token, ethSwap; + const tokenValue = etherToWei("1000000"); + before(async () => { + token = await Token.new(); + ethSwap = await EthSwap.new(token.address); + // ethSwap = await EthSwap.new(token.address); + await token.transfer(ethSwap.address, tokenValue); //transfer 1 million tokens + }); + describe("Token deployment", async () => { + it("contract has a name", async () => { + const name = await token.name(); + assert.equal(name, "DApp Token"); + }); + }); + describe("EthSwap deployment", async () => { + it("contract has a name", async () => { + const name = await ethSwap.name(); + assert.equal(name, "EthSwap Instants exchange"); + }); + it("contract has token", async () => { + let balance = await token.balanceOf(ethSwap.address); + assert.equal(balance.toString(), tokenValue); + }); + }); + describe('buyTokens()', async() => { + let result; + before(async()=>{ + //purchase tokens before each example + result = await ethSwap.buyTokens({from:investor, value:etherToWei('1')}) + }) + it('Allows users to instantly purchase tokens from ethSwap for a fixed price', async()=>{ + // check investor's token balance after purchase + const investorBalance = await token.balanceOf(investor); + assert.equal(investorBalance.toString(), etherToWei('100')); + + //check EthSwap balance after purchase + const ethSwapTokenBalance = await token.balanceOf(ethSwap.address); + assert.equal(ethSwapTokenBalance.toString(), etherToWei('999900')); + const ethSwapEtherBalance = await web3.eth.getBalance(ethSwap.address); + assert.equal(ethSwapEtherBalance.toString(), etherToWei('1')) + + // check logs to ensure events was emitted with correct data + const events = result.logs[0].args; + assert.equal(events.account,investor); + assert.equal(events.token,token.address); + assert.equal(events.amount.toString(), etherToWei('100').toString()); + assert.equal(events.rate.toString(),"100") + }) + }); + describe('sellTokens()', async() => { + let soldTokenResult; + before(async()=>{ + // Investor must approve tokens before the seeling them. + await token.approve(ethSwap.address,etherToWei('100'), {from:investor}); + // Investor sells tokens + soldTokenResult = await ethSwap.sellTokens(etherToWei('100'), {from:investor}); + }) + it('Allows users to instantly sell tokens from ethSwap for a fixed price', async()=>{ + // check investor's balance + const investorBalance = await token.balanceOf(investor); + assert.equal(investorBalance.toString(), etherToWei('0')); + + //check EthSwap balance after purchase + const ethSwapTokenBalance = await token.balanceOf(ethSwap.address); + assert.equal(ethSwapTokenBalance.toString(), etherToWei('1000000')); + const ethSwapEtherBalance = await web3.eth.getBalance(ethSwap.address); + assert.equal(ethSwapEtherBalance.toString(), etherToWei('0')) + + // check logs to ensure events was emitted with correct data + const events = soldTokenResult.logs[0].args; + assert.equal(events.account,investor); + assert.equal(events.token,token.address); + assert.equal(events.amount.toString(), etherToWei('100').toString()); + assert.equal(events.rate.toString(),"100"); + + // FAILUR: Investor can't sell more tokens than they have + await ethSwap.sellTokens(etherToWei('500'), {from:investor}).should.be.rejected + }) + }); +}); diff --git a/truffle-config.js b/truffle-config.js index 92b5ae506..a1bcdfe32 100644 --- a/truffle-config.js +++ b/truffle-config.js @@ -16,7 +16,8 @@ module.exports = { optimizer: { enabled: true, runs: 200 - } + }, + evmVersion: "petersburg" } } }