LaunchToken

[
  {
    "inputs": [
      {
        "internalType": "string",
        "name": "name_",
        "type": "string"
      },
      {
        "internalType": "string",
        "name": "symbol_",
        "type": "string"
      },
      {
        "internalType": "uint256",
        "name": "supply_",
        "type": "uint256"
      },
      {
        "internalType": "uint16",
        "name": "maxWalletBps_",
        "type": "uint16"
      },
      {
        "internalType": "uint16",
        "name": "maxTxBps_",
        "type": "uint16"
      }
    ],
    "stateMutability": "nonpayable",
    "type": "constructor"
  },
  {
    "inputs": [],
    "name": "AlreadyInitialized",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "spender",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "allowance",
        "type": "uint256"
      },
      {
        "internalType": "uint256",
        "name": "needed",
        "type": "uint256"
      }
    ],
    "name": "ERC20InsufficientAllowance",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "sender",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "balance",
        "type": "uint256"
      },
      {
        "internalType": "uint256",
        "name": "needed",
        "type": "uint256"
      }
    ],
    "name": "ERC20InsufficientBalance",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "approver",
        "type": "address"
      }
    ],
    "name": "ERC20InvalidApprover",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "receiver",
        "type": "address"
      }
    ],
    "name": "ERC20InvalidReceiver",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "sender",
        "type": "address"
      }
    ],
    "name": "ERC20InvalidSender",
    "type": "error"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "spender",
        "type": "address"
      }
    ],
    "name": "ERC20InvalidSpender",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "MaxTxExceeded",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "MaxWalletExceeded",
    "type": "error"
  },
  {
    "inputs": [],
    "name": "NotFactory",
    "type": "error"
  },
  {
    "anonymous": false,
    "inputs": [
      {
        "indexed": true,
        "internalType": "address",
        "name": "owner",
        "type": "address"
      },
      {
        "indexed": true,
        "internalType": "address",
        "name": "spender",
        "type": "address"
      },
      {
        "indexed": false,
        "internalType": "uint256",
        "name": "value",
        "type": "uint256"
      }
    ],
    "name": "Approval",
    "type": "event"
  },
  {
    "anonymous": false,
    "inputs": [
      {
        "indexed": true,
        "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"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "owner",
        "type": "address"
      },
      {
        "internalType": "address",
        "name": "spender",
        "type": "address"
      }
    ],
    "name": "allowance",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "spender",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "value",
        "type": "uint256"
      }
    ],
    "name": "approve",
    "outputs": [
      {
        "internalType": "bool",
        "name": "",
        "type": "bool"
      }
    ],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "account",
        "type": "address"
      }
    ],
    "name": "balanceOf",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "decimals",
    "outputs": [
      {
        "internalType": "uint8",
        "name": "",
        "type": "uint8"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "factory",
    "outputs": [
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "uint256",
        "name": "endBlock_",
        "type": "uint256"
      }
    ],
    "name": "initRestrictionsEndBlock",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "maxTxAmount",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "maxWalletAmount",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "name",
    "outputs": [
      {
        "internalType": "string",
        "name": "",
        "type": "string"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "",
        "type": "address"
      }
    ],
    "name": "restrictionExempt",
    "outputs": [
      {
        "internalType": "bool",
        "name": "",
        "type": "bool"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "restrictionsActive",
    "outputs": [
      {
        "internalType": "bool",
        "name": "",
        "type": "bool"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "restrictionsEndBlock",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "account",
        "type": "address"
      },
      {
        "internalType": "bool",
        "name": "value",
        "type": "bool"
      }
    ],
    "name": "setRestrictionExempt",
    "outputs": [],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "symbol",
    "outputs": [
      {
        "internalType": "string",
        "name": "",
        "type": "string"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [],
    "name": "totalSupply",
    "outputs": [
      {
        "internalType": "uint256",
        "name": "",
        "type": "uint256"
      }
    ],
    "stateMutability": "view",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "to",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "value",
        "type": "uint256"
      }
    ],
    "name": "transfer",
    "outputs": [
      {
        "internalType": "bool",
        "name": "",
        "type": "bool"
      }
    ],
    "stateMutability": "nonpayable",
    "type": "function"
  },
  {
    "inputs": [
      {
        "internalType": "address",
        "name": "from",
        "type": "address"
      },
      {
        "internalType": "address",
        "name": "to",
        "type": "address"
      },
      {
        "internalType": "uint256",
        "name": "value",
        "type": "uint256"
      }
    ],
    "name": "transferFrom",
    "outputs": [
      {
        "internalType": "bool",
        "name": "",
        "type": "bool"
      }
    ],
    "stateMutability": "nonpayable",
    "type": "function"
  }
]

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;

import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";

/// @notice ERC20 launched by the LaunchFactory. Enforces anti-snipe max-wallet /
/// max-tx limits until `restrictionsEndBlock`, after which it behaves as a plain ERC20.
contract LaunchToken is ERC20 {
    error NotFactory();
    error AlreadyInitialized();
    error MaxWalletExceeded();
    error MaxTxExceeded();

    address public immutable factory;
    /// @notice Set once by the factory in the launch transaction. Kept out of
    /// the constructor so the CREATE2 init code is block-independent, letting
    /// launchers mine vanity token addresses off-chain.
    uint256 public restrictionsEndBlock;
    uint256 public immutable maxWalletAmount; // 0 = no limit
    uint256 public immutable maxTxAmount; // 0 = no limit

    /// @notice Addresses exempt from restrictions (pool, locker, position manager, router, factory).
    mapping(address => bool) public restrictionExempt;

    constructor(
        string memory name_,
        string memory symbol_,
        uint256 supply_,
        uint16 maxWalletBps_,
        uint16 maxTxBps_
    ) ERC20(name_, symbol_) {
        factory = msg.sender;
        maxWalletAmount = maxWalletBps_ > 10_000 ? 0 : (supply_ * maxWalletBps_) / 10_000;
        maxTxAmount = maxTxBps_ > 10_000 ? 0 : (supply_ * maxTxBps_) / 10_000;
        _mint(msg.sender, supply_);
    }

    /// @notice One-time wiring by the factory, same transaction as the deploy.
    function initRestrictionsEndBlock(uint256 endBlock_) external {
        if (msg.sender != factory) revert NotFactory();
        if (restrictionsEndBlock != 0) revert AlreadyInitialized();
        restrictionsEndBlock = endBlock_;
    }

    /// @notice Factory marks protocol addresses as exempt during launch (one-way).
    function setRestrictionExempt(address account, bool value) external {
        if (msg.sender != factory) revert NotFactory();
        restrictionExempt[account] = value;
    }

    function restrictionsActive() public view returns (bool) {
        return block.number < restrictionsEndBlock;
    }

    function _update(address from, address to, uint256 value) internal override {
        if (from != address(0) && to != address(0) && restrictionsActive()) {
            if (maxTxAmount != 0 && value > maxTxAmount && !restrictionExempt[from] && !restrictionExempt[to]) {
                revert MaxTxExceeded();
            }
            if (maxWalletAmount != 0 && restrictionExempt[from] && balanceOf(to) + value < maxWalletAmount) {
                revert MaxWalletExceeded();
            }
        }
        super._update(from, to, value);
    }
}