// SPDX-License-Identifier: AGPL-3.0-or-later
// Copyright (C) 2024 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 ^0.8.21;

interface GemLike {
    function approve(address, uint256) external;
}

// Escrow funds on L1, manage approval rights

contract Escrow {
    // --- storage variables ---

    mapping(address => uint256) public wards;

    // --- events ---

    event Rely(address indexed usr);
    event Deny(address indexed usr);
    event Approve(address indexed token, address indexed spender, uint256 value);

    // --- modifiers ---

    modifier auth() {
        require(wards[msg.sender] == 1, "Escrow/not-authorized");
        _;
    }

    // --- constructor ---

    constructor() {
        wards[msg.sender] = 1;
        emit Rely(msg.sender);
    }

    // --- administration ---

    function rely(address usr) external auth {
        wards[usr] = 1;
        emit Rely(usr);
    }

    function deny(address usr) external auth {
        wards[usr] = 0;
        emit Deny(usr);
    }

    // --- approve ---

    function approve(address token, address spender, uint256 value) external auth {
        GemLike(token).approve(spender, value);
        emit Approve(token, spender, value);
    }
}

{
  "compilationTarget": {
    "src/Escrow.sol": "Escrow"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [
    ":@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    ":@openzeppelin/contracts/=lib/openzeppelin-contracts-upgradeable/lib/openzeppelin-contracts/contracts/",
    ":ds-test/=lib/openzeppelin-contracts-upgradeable/lib/forge-std/lib/ds-test/src/",
    ":dss-interfaces/=lib/dss-test/lib/dss-interfaces/src/",
    ":dss-test/=lib/dss-test/src/",
    ":erc4626-tests/=lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    ":forge-std/=lib/dss-test/lib/forge-std/src/",
    ":openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    ":openzeppelin-contracts/=lib/openzeppelin-contracts-upgradeable/lib/openzeppelin-contracts/",
    ":openzeppelin-foundry-upgrades/=lib/openzeppelin-foundry-upgrades/src/",
    ":solidity-stringutils/=lib/openzeppelin-foundry-upgrades/lib/solidity-stringutils/"
  ]
}