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contracts/goerli/0c/0Cc893De41c14D696C2786bFE9f6b70d24E3cFCc_L1GovernanceRelay.sol

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+// SPDX-License-Identifier: AGPL-3.0-or-later
+// Copyright (C) 2021 Dai Foundation
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+pragma solidity ^0.7.6;
+
+import "./L1DAIBridge.sol";
+
+contract L1GovernanceRelay {
+  // --- Auth ---
+  mapping(address => uint256) public wards;
+  function rely(address usr) external auth {
+    wards[usr] = 1;
+    emit Rely(usr);
+  }
+  function deny(address usr) external auth {
+    wards[usr] = 0;
+    emit Deny(usr);
+  }
+  modifier auth() {
+    require(wards[msg.sender] == 1, "L1GovernanceRelay/not-authorized");
+    _;
+  }
+
+  event Rely(address indexed usr);
+  event Deny(address indexed usr);
+
+  uint256 constant RELAY_SELECTOR = 300224956480472355485152391090755024345070441743081995053718200325371913697;
+
+  address public immutable starkNet;
+  uint256 public immutable l2GovernanceRelay;
+
+  constructor(address _starkNet, uint256 _l2GovernanceRelay) {
+    wards[msg.sender] = 1;
+    emit Rely(msg.sender);
+
+    starkNet = _starkNet;
+    l2GovernanceRelay = _l2GovernanceRelay;
+  }
+
+  // Forward a call to be repeated on L2
+  function relay(uint256 spell) external auth {
+    uint256[] memory payload = new uint256[](1);
+    payload[0] = spell;
+    StarkNetLike(starkNet).sendMessageToL2(l2GovernanceRelay, RELAY_SELECTOR, payload);
+  }
+}
+
+// SPDX-License-Identifier: AGPL-3.0-or-later
+// Copyright (C) 2021 Dai Foundation
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+pragma solidity ^0.7.6;
+
+interface TokenLike {
+    function transferFrom(
+        address from,
+        address to,
+        uint256 value
+    ) external returns (bool success);
+
+    function balanceOf(address account) external view returns (uint256);
+}
+
+interface StarkNetLike {
+    function sendMessageToL2(
+        uint256 to,
+        uint256 selector,
+        uint256[] calldata payload
+    ) external;
+
+    function consumeMessageFromL2(
+        uint256 from,
+        uint256[] calldata payload
+    ) external;
+}
+
+contract L1DAIBridge {
+    // --- Auth ---
+    mapping(address => uint256) public wards;
+
+    function rely(address usr) external auth {
+        wards[usr] = 1;
+        emit Rely(usr);
+    }
+
+    function deny(address usr) external auth {
+        wards[usr] = 0;
+        emit Deny(usr);
+    }
+
+    modifier auth() {
+        require(wards[msg.sender] == 1, "L1DAIBridge/not-authorized");
+        _;
+    }
+
+    event Rely(address indexed usr);
+    event Deny(address indexed usr);
+
+
+    uint256 public isOpen = 1;
+
+    modifier whenOpen() {
+        require(isOpen == 1, "L1DAIBridge/closed");
+        _;
+    }
+
+    function close() external auth {
+        isOpen = 0;
+        emit Closed();
+    }
+
+    event Closed();
+
+    address public immutable starkNet;
+    address public immutable dai;
+    uint256 public immutable l2Dai;
+    address public immutable escrow;
+    uint256 public immutable l2DaiBridge;
+
+    uint256 public ceiling = 0;
+
+    uint256 constant HANDLE_WITHDRAW = 0;
+
+    // src/starkware/cairo/lang/cairo_constants.py
+    //  2 ** 251 + 17 * 2 ** 192 + 1;
+    uint256 constant SN_PRIME =
+        3618502788666131213697322783095070105623107215331596699973092056135872020481;
+
+    //  from starkware.starknet.compiler.compile import get_selector_from_name
+    //  print(get_selector_from_name('handle_deposit'))
+    uint256 constant DEPOSIT =
+        1285101517810983806491589552491143496277809242732141897358598292095611420389;
+
+    //  print(get_selector_from_name('handle_force_withdrawal'))
+    uint256 constant FORCE_WITHDRAW =
+        1137729855293860737061629600728503767337326808607526258057644140918272132445;
+
+    event LogCeiling(uint256 ceiling);
+    event LogDeposit(address indexed l1Sender, uint256 amount, uint256 l2Recipient);
+    event LogWithdrawal(address indexed l1Recipient, uint256 amount);
+    event LogForceWithdrawal(
+        address indexed l1Recipient,
+        uint256 amount,
+        uint256 indexed l2Sender
+    );
+
+    constructor(
+        address _starkNet,
+        address _dai,
+        uint256 _l2Dai,
+        address _escrow,
+        uint256 _l2DaiBridge
+    ) {
+        wards[msg.sender] = 1;
+        emit Rely(msg.sender);
+
+        starkNet = _starkNet;
+        dai = _dai;
+        l2Dai = _l2Dai;
+        escrow = _escrow;
+        l2DaiBridge = _l2DaiBridge;
+    }
+
+    function setCeiling(uint256 _ceiling) external auth whenOpen {
+        ceiling = _ceiling;
+        emit LogCeiling(_ceiling);
+    }
+
+    // slither-disable-next-line similar-names
+    function deposit(
+        uint256 amount,
+        uint256 l2Recipient
+    ) external whenOpen {
+        emit LogDeposit(msg.sender, amount, l2Recipient);
+
+        require(l2Recipient != 0 && l2Recipient != l2Dai && l2Recipient < SN_PRIME, "L1DAIBridge/invalid-address");
+
+        TokenLike(dai).transferFrom(msg.sender, escrow, amount);
+
+        require(
+            TokenLike(dai).balanceOf(escrow) <= ceiling,
+            "L1DAIBridge/above-ceiling"
+        );
+
+        uint256[] memory payload = new uint256[](3);
+        payload[0] = l2Recipient;
+        (payload[1], payload[2]) = toSplitUint(amount);
+
+        StarkNetLike(starkNet).sendMessageToL2(l2DaiBridge, DEPOSIT, payload);
+    }
+
+    function toSplitUint(uint256 value) internal pure returns (uint256, uint256) {
+      uint256 low = value & ((1 << 128) - 1);
+      uint256 high = value >> 128;
+      return (low, high);
+    }
+
+    // slither-disable-next-line similar-names
+    function withdraw(uint256 amount, address l1Recipient) external {
+        emit LogWithdrawal(l1Recipient, amount);
+
+        uint256[] memory payload = new uint256[](4);
+        payload[0] = HANDLE_WITHDRAW;
+        payload[1] = uint256(uint160(msg.sender));
+        (payload[2], payload[3]) = toSplitUint(amount);
+
+        StarkNetLike(starkNet).consumeMessageFromL2(l2DaiBridge, payload);
+        TokenLike(dai).transferFrom(escrow, l1Recipient, amount);
+    }
+
+    function forceWithdrawal(uint256 amount, uint256 l2Sender) external whenOpen {
+        emit LogForceWithdrawal(msg.sender, amount, l2Sender);
+
+        uint256[] memory payload = new uint256[](4);
+        payload[0] = l2Sender;
+        payload[1] = uint256(uint160(msg.sender));
+        (payload[2], payload[3]) = toSplitUint(amount);
+
+        StarkNetLike(starkNet).sendMessageToL2(l2DaiBridge, FORCE_WITHDRAW, payload);
+    }
+}