[wip]: add contract package

package.json

@@ -69,6 +69,7 @@
     "lerna": "4.0.0",
     "lint-staged": "^10.2.11",
     "prettier": "^2.0.5",
+    "ts-node": "^10.2.1",
     "typescript": "~3.9.5"
   },
   "private": true

packages/contracts/.gitignore

@@ -0,0 +1,107 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+
+# Next.js build output
+.next
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and *not* Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+artifacts/
+cache/

packages/contracts/.prettierrc

@@ -0,0 +1,10 @@
+{
+  "printWidth": 120,
+  "singleQuote": true,
+  "trailingComma": "all",
+  "bracketSpacing": true,
+  "arrowParens": "avoid",
+  "semi": true,
+  "useTabs": false,
+  "tabWidth": 2
+}

packages/contracts/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 AMIS
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

packages/contracts/contracts/metatx/ERC2771Context.sol

@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v4.5.0) (metatx/ERC2771Context.sol)
+
+pragma solidity ^0.8.9;
+
+import '@openzeppelin/contracts/utils/Context.sol';
+
+/**
+ * @dev Context variant with ERC2771 support.
+ */
+abstract contract ERC2771Context is Context {
+  /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
+  address private immutable _trustedForwarder;
+
+  /// @custom:oz-upgrades-unsafe-allow constructor
+  constructor(address trustedForwarder) {
+    _trustedForwarder = trustedForwarder;
+  }
+
+  function isTrustedForwarder(address forwarder) public view virtual returns (bool) {
+    return forwarder == _trustedForwarder;
+  }
+
+  function _msgSender() internal view virtual override returns (address sender) {
+    if (isTrustedForwarder(msg.sender)) {
+      // The assembly code is more direct than the Solidity version using `abi.decode`.
+      assembly {
+        sender := shr(96, calldataload(sub(calldatasize(), 20)))
+      }
+    } else {
+      return super._msgSender();
+    }
+  }
+
+  function _msgData() internal view virtual override returns (bytes calldata) {
+    if (isTrustedForwarder(msg.sender)) {
+      return msg.data[:msg.data.length - 20];
+    } else {
+      return super._msgData();
+    }
+  }
+}

packages/contracts/contracts/metatx/ERC2771ContextUpgradeable.sol

@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v4.5.0) (metatx/ERC2771Context.sol)
+
+pragma solidity ^0.8.9;
+
+import '@openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol';
+import '@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol';
+
+/**
+ * @dev Context variant with ERC2771 support.
+ */
+abstract contract ERC2771ContextUpgradeable is Initializable, ContextUpgradeable {
+  /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
+  address private immutable _trustedForwarder;
+
+  /// @custom:oz-upgrades-unsafe-allow constructor
+  constructor(address trustedForwarder) {
+    _trustedForwarder = trustedForwarder;
+  }
+
+  function isTrustedForwarder(address forwarder) public view virtual returns (bool) {
+    return forwarder == _trustedForwarder;
+  }
+
+  function _msgSender() internal view virtual override returns (address sender) {
+    if (isTrustedForwarder(msg.sender)) {
+      // The assembly code is more direct than the Solidity version using `abi.decode`.
+      assembly {
+        sender := shr(96, calldataload(sub(calldatasize(), 20)))
+      }
+    } else {
+      return super._msgSender();
+    }
+  }
+
+  function _msgData() internal view virtual override returns (bytes calldata) {
+    if (isTrustedForwarder(msg.sender)) {
+      return msg.data[:msg.data.length - 20];
+    } else {
+      return super._msgData();
+    }
+  }
+
+  /**
+   * @dev This empty reserved space is put in place to allow future versions to add new
+   * variables without shifting down storage in the inheritance chain.
+   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
+   */
+  uint256[50] private __gap;
+}

packages/contracts/contracts/metatx/Forwarder.sol

@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.9;
+
+import '@openzeppelin/contracts/access/Ownable.sol';
+import '@openzeppelin/contracts/utils/math/SafeMath.sol';
+import '@openzeppelin/contracts/utils/cryptography/ECDSA.sol';
+import '@openzeppelin/contracts/utils/cryptography/draft-EIP712.sol';
+
+/**
+ * @dev Simple minimal forwarder to be used together with an ERC2771 compatible contract. See {ERC2771Context}.
+ */
+contract Forwarder is Ownable, EIP712 {
+  using ECDSA for bytes32;
+  using SafeMath for uint256;
+
+  struct ForwardRequest {
+    address from;
+    address to;
+    uint256 value;
+    uint256 gas;
+    uint256 nonce;
+    bytes data;
+  }
+
+  bytes32 private constant _TYPEHASH =
+    keccak256('ForwardRequest(address from,address to,uint256 value,uint256 gas,uint256 nonce,bytes data)');
+
+  mapping(address => uint256) private _nonces;
+
+  constructor(string memory name, string memory version) EIP712(name, version) {}
+
+  function getNonce(address from) public view returns (uint256) {
+    return _nonces[from];
+  }
+
+  function verify(ForwardRequest calldata req, bytes calldata signature) public view returns (bool) {
+    address signer = _hashTypedDataV4(
+      keccak256(abi.encode(_TYPEHASH, req.from, req.to, req.value, req.gas, req.nonce, keccak256(req.data)))
+    ).recover(signature);
+    return _nonces[req.from] == req.nonce && signer == req.from;
+  }
+
+  function execute(ForwardRequest calldata req, bytes calldata signature)
+    public
+    payable
+    onlyOwner
+    returns (bool, bytes memory)
+  {
+    require(verify(req, signature), 'Forwarder: signature does not match request');
+    _nonces[req.from] = req.nonce.add(1);
+
+    (bool success, bytes memory returndata) = req.to.call{ gas: req.gas, value: req.value }(
+      abi.encodePacked(req.data, req.from)
+    );
+
+    // Validate that the relayer has sent enough gas for the call.
+    // See https://ronan.eth.link/blog/ethereum-gas-dangers/
+    if (gasleft() <= req.gas / 63) {
+      // We explicitly trigger invalid opcode to consume all gas and bubble-up the effects, since
+      // neither revert or assert consume all gas since Solidity 0.8.0
+      // https://docs.soliditylang.org/en/v0.8.0/control-structures.html#panic-via-assert-and-error-via-require
+      assembly {
+        invalid()
+      }
+    }
+
+    return (success, returndata);
+  }
+}

packages/contracts/contracts/metatx/ForwarderUpgradeable.sol

@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v4.5.0) (metatx/MinimalForwarder.sol)
+
+pragma solidity ^0.8.0;
+
+import '@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol';
+import '@openzeppelin/contracts-upgradeable/utils/cryptography/ECDSAUpgradeable.sol';
+import '@openzeppelin/contracts-upgradeable/utils/math/SafeMathUpgradeable.sol';
+import '@openzeppelin/contracts-upgradeable/utils/cryptography/draft-EIP712Upgradeable.sol';
+import '@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol';
+
+contract ForwarderUpgradeable is Initializable, OwnableUpgradeable, EIP712Upgradeable {
+  using ECDSAUpgradeable for bytes32;
+  using SafeMathUpgradeable for uint256;
+
+  struct ForwardRequest {
+    address from;
+    address to;
+    uint256 value;
+    uint256 gas;
+    uint256 nonce;
+    bytes data;
+  }
+
+  bytes32 private constant _TYPEHASH =
+    keccak256('ForwardRequest(address from,address to,uint256 value,uint256 gas,uint256 nonce,bytes data)');
+
+  mapping(address => uint256) private _nonces;
+
+  function __Forwarder_init(string memory name, string memory version) internal onlyInitializing {
+    __Ownable_init_unchained();
+    __EIP712_init_unchained(name, version);
+  }
+
+  function __Forwarder_init_unchained() internal onlyInitializing {}
+
+  function getNonce(address from) public view returns (uint256) {
+    return _nonces[from];
+  }
+
+  function verify(ForwardRequest calldata req, bytes calldata signature) public view returns (bool) {
+    address signer = _hashTypedDataV4(
+      keccak256(abi.encode(_TYPEHASH, req.from, req.to, req.value, req.gas, req.nonce, keccak256(req.data)))
+    ).recover(signature);
+    return _nonces[req.from] == req.nonce && signer == req.from;
+  }
+
+  function execute(ForwardRequest calldata req, bytes calldata signature)
+    public
+    payable
+    onlyOwner
+    returns (bool, bytes memory)
+  {
+    require(verify(req, signature), 'Forwarder: signature does not match request');
+    _nonces[req.from] = req.nonce.add(1);
+
+    (bool success, bytes memory returndata) = req.to.call{ gas: req.gas, value: req.value }(
+      abi.encodePacked(req.data, req.from)
+    );
+
+    // Validate that the relayer has sent enough gas for the call.
+    // See https://ronan.eth.link/blog/ethereum-gas-dangers/
+    if (gasleft() <= req.gas / 63) {
+      // We explicitly trigger invalid opcode to consume all gas and bubble-up the effects, since
+      // neither revert or assert consume all gas since Solidity 0.8.0
+      // https://docs.soliditylang.org/en/v0.8.0/control-structures.html#panic-via-assert-and-error-via-require
+      assembly {
+        invalid()
+      }
+    }
+
+    return (success, returndata);
+  }
+
+  /**
+   * @dev This empty reserved space is put in place to allow future versions to add new
+   * variables without shifting down storage in the inheritance chain.
+   * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
+   */
+  uint256[48] private __gap;
+}