Add custom erc20 contract to the EVM.

.github/workflows/lints.yml

@@ -34,8 +34,18 @@ jobs:
           toolchain: nightly-2021-03-25
           override: true
           components: clippy
+      - run: make etc/eth-contracts/res/EvmErc20.bin
       - name: Run cargo clippy
         uses: actions-rs/cargo@v1
         with:
           command: clippy
           args: --no-default-features --features=contract -- -D warnings
+  contracts:
+    name: eth-contracts
+    runs-on: ubuntu-latest
+    steps:
+      - name: Clone the repository
+        uses: actions/checkout@v2
+      - name: Run yarn lint
+        working-directory: etc/eth-contracts
+        run: yarn && yarn lint

.gitignore

@@ -13,3 +13,9 @@
 # Rust artifacts
 /*.wasm
 /target/
+
+# Solidity artifacts
+artifacts/
+cache/
+node_modules/
+res/

Makefile

@@ -13,9 +13,12 @@ release: release.wasm
 release.wasm: target/wasm32-unknown-unknown/release/aurora_engine.wasm
 	ln -sf $< $@
 
-target/wasm32-unknown-unknown/release/aurora_engine.wasm: Cargo.toml Cargo.lock $(wildcard src/*.rs)
+target/wasm32-unknown-unknown/release/aurora_engine.wasm: Cargo.toml Cargo.lock $(wildcard src/*.rs) etc/eth-contracts/res/EvmErc20.bin
 	RUSTFLAGS='-C link-arg=-s' $(CARGO) build --target wasm32-unknown-unknown --release --no-default-features --features=$(FEATURES) -Z avoid-dev-deps
 
+etc/eth-contracts/res/EvmErc20.bin: $(wildcard etc/eth-contracts/contracts/*.sol) etc/eth-contracts/package.json
+	cd etc/eth-contracts && yarn && yarn build
+
 debug: debug.wasm
 
 debug.wasm: target/wasm32-unknown-unknown/debug/aurora_engine.wasm

etc/eth-contracts/.eslintignore

@@ -0,0 +1 @@
+node_modules/

etc/eth-contracts/.eslintrc

@@ -0,0 +1,52 @@
+{
+  "extends" : [
+    "standard",
+    "plugin:promise/recommended"
+  ],
+  "plugins": [
+    "promise"
+  ],
+  "env": {
+    "browser" : true,
+    "node": true,
+    "mocha": true,
+    "jest": true
+  },
+  "globals" : {
+    "artifacts": false,
+    "contract": false,
+    "assert": false,
+    "web3": false
+  },
+  "rules": {
+
+    // Strict mode
+    "strict": [2, "global"],
+
+    // Code style
+    "indent": [2, 4],
+    "quotes": [2, "single"],
+    "semi": ["error", "always"],
+    "space-before-function-paren": ["error", "always"],
+    "no-use-before-define": 0,
+    "no-unused-expressions": "off",
+    "eqeqeq": [2, "smart"],
+    "dot-notation": [2, {"allowKeywords": true, "allowPattern": ""}],
+    "no-redeclare": [2, {"builtinGlobals": true}],
+    "no-trailing-spaces": [2, { "skipBlankLines": true }],
+    "eol-last": 1,
+    "comma-spacing": [2, {"before": false, "after": true}],
+    "camelcase": [2, {"properties": "always"}],
+    "no-mixed-spaces-and-tabs": [2, "smart-tabs"],
+    "comma-dangle": [1, "always-multiline"],
+    "no-dupe-args": 2,
+    "no-dupe-keys": 2,
+    "no-debugger": 0,
+    "no-undef": 2,
+    "object-curly-spacing": [2, "always"],
+    "max-len": [2, 200, 2],
+    "generator-star-spacing": ["error", "before"],
+    "promise/avoid-new": 0,
+    "promise/always-return": 0
+  }
+}

etc/eth-contracts/.soliumignore

@@ -0,0 +1 @@
+node_modules

etc/eth-contracts/.soliumrc.json

@@ -0,0 +1,23 @@
+{
+  "extends": "solium:all",
+  "plugins": ["security"],
+  "rules": {
+    "mixedcase": "off",
+    "error-reason": "off",
+    "indentation": ["error", 4],
+    "lbrace": "off",
+    "linebreak-style": ["error", "unix"],
+    "max-len": ["error", 139],
+    "no-constant": ["error"],
+    "no-empty-blocks": "off",
+    "quotes": ["error", "double"],
+    "uppercase": "off",
+    "visibility-first": "error",
+    "arg-overflow": ["error", 5],
+    "function-order": "off",
+
+    "security/enforce-explicit-visibility": ["error"],
+    "security/no-block-members": ["off"],
+    "security/no-inline-assembly": ["warning"]
+  }
+}

etc/eth-contracts/contracts/AdminControlled.sol

@@ -0,0 +1,46 @@
+pragma solidity ^0.8.0;
+
+
+contract AdminControlled {
+    address public admin;
+    uint public paused;
+
+    constructor(address _admin, uint flags) {
+        admin = _admin;
+
+        // Add the possibility to set pause flags on the initialization
+        paused = flags;
+    }
+
+    modifier onlyAdmin {
+        require(msg.sender == admin);
+        _;
+    }
+
+    modifier pausable(uint flag) {
+        require((paused & flag) == 0 || msg.sender == admin);
+        _;
+    }
+
+    function adminPause(uint flags) public onlyAdmin {
+        paused = flags;
+    }
+
+    function adminSstore(uint key, uint value) public onlyAdmin {
+        assembly {
+            sstore(key, value)
+        }
+    }
+
+    function adminSendEth(address payable destination, uint amount) public onlyAdmin {
+        destination.transfer(amount);
+    }
+
+    function adminReceiveEth() public payable onlyAdmin {}
+
+    function adminDelegatecall(address target, bytes memory data) public payable onlyAdmin returns (bytes memory) {
+        (bool success, bytes memory rdata) = target.delegatecall(data);
+        require(success);
+        return rdata;
+    }
+}

etc/eth-contracts/contracts/EvmErc20.sol

@@ -0,0 +1,28 @@
+pragma solidity ^0.8.0;
+
+import "@openzeppelin/contracts/utils/Context.sol";
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "./AdminControlled.sol";
+
+
+/**
+ * @title SimpleToken
+ * @dev Very simple ERC20 Token example, where all tokens are pre-assigned to the creator.
+ * Note they can later distribute these tokens as they wish using `transfer` and other
+ * `ERC20` functions.
+ */
+contract EvmErc20 is Context, ERC20, AdminControlled {
+    uint8 private _decimals;
+
+    constructor (string memory name, string memory symbol, uint8 decimal)  ERC20(name, symbol) AdminControlled(address(0), 0) {
+        _decimals = decimal;
+    }
+
+    function decimals() public view override returns (uint8) {
+        return _decimals;
+    }
+
+    function mint(address account, uint256 amount) public onlyAdmin {
+        _mint(account, amount);
+    }
+}

etc/eth-contracts/hardhat.config.js

@@ -0,0 +1,17 @@
+require('@nomiclabs/hardhat-ethers');
+require('solidity-coverage');
+
+/**
+ * @type import('hardhat/config').HardhatUserConfig
+ */
+module.exports = {
+    solidity: {
+        version: '0.8.3',
+        settings: {
+            optimizer: {
+                enabled: true,
+                runs: 1000,
+            },
+        },
+    },
+};

etc/eth-contracts/main.js

@@ -0,0 +1,7 @@
+const fs = require('fs');
+const path = require('path');
+const artifact = require(process.argv[2]);
+if (!fs.existsSync('res')) {
+    fs.mkdirSync('res');
+}
+fs.writeFileSync(path.join('res', 'EvmErc20.bin'), artifact.bytecode.substring(2));

etc/eth-contracts/package.json

@@ -0,0 +1,37 @@
+{
+  "name": "vanilla-erc20-token",
+  "version": "0.1.0",
+  "description": "ERC20 token implementation on EVM mapped from Native NEP-141",
+  "dependencies": {
+    "@openzeppelin/contracts": "^4.1.0"
+  },
+  "devDependencies": {
+    "@nomiclabs/hardhat-ethers": "^2.0.1",
+    "chai": "^4.3.3",
+    "eslint": "^6.3.0",
+    "eslint-config-standard": "^14.1.0",
+    "eslint-plugin-import": "^2.14.0",
+    "eslint-plugin-node": "^11.0.0",
+    "eslint-plugin-promise": "^4.0.1",
+    "eslint-plugin-standard": "^4.0.0",
+    "eth-gas-reporter": "^0.2.11",
+    "ethers": "^5.0.31",
+    "hardhat": "^2.1.1",
+    "rainbow-bridge-lib": "^2.0.0",
+    "solc": "0.8.3",
+    "solidity-coverage": "^0.7.16",
+    "solium": "^1.2.5"
+  },
+  "scripts": {
+    "compile": "hardhat compile",
+    "build": "yarn compile && node main.js ./artifacts/contracts/EvmErc20.sol/EvmErc20.json",
+    "test": "hardhat test",
+    "coverage": "hardhat coverage",
+    "lint:js": "eslint .",
+    "lint:js:fix": "eslint . --fix",
+    "lint:sol": "solium -d .",
+    "lint:sol:fix": "solium -d . --fix",
+    "lint": "yarn lint:js && yarn lint:sol",
+    "lint:fix": "yarn lint:js:fix && yarn lint:sol:fix"
+  }
+}