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// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.6;

import "./interfaces/ICrossChainBridge.sol";

contract SimpleTokenProxy {

    bytes32 private constant BEACON_SLOT = bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1);

    fallback() external {
        address bridge;
        bytes32 slot = BEACON_SLOT;
        assembly {
            bridge := sload(slot)
        }
        address impl = ICrossChainBridge(bridge).getTokenImplementation();
        assembly {
            calldatacopy(0, 0, calldatasize())
            let result := delegatecall(gas(), impl, 0, calldatasize(), 0, 0)
            returndatacopy(0, 0, returndatasize())
            switch result
            case 0 {revert(0, returndatasize())}
            default {return (0, returndatasize())}
        }
    }

    function setBeacon(address newBeacon) external {
        address beacon;
        bytes32 slot = BEACON_SLOT;
        assembly {
            beacon := sload(slot)
        }
        require(beacon == address(0x00));
        assembly {
            sstore(slot, newBeacon)
        }
    }
}

library SimpleTokenProxyUtils {

    bytes constant internal SIMPLE_TOKEN_PROXY_BYTECODE = hex"608060405234801561001057600080fd5b50610215806100206000396000f3fe608060405234801561001057600080fd5b506004361061002b5760003560e01c8063d42afb56146100fd575b60008061005960017fa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d516101a2565b60001b9050805491506000826001600160a01b031663709bc7f36040518163ffffffff1660e01b8152600401602060405180830381600087803b15801561009f57600080fd5b505af11580156100b3573d6000803e3d6000fd5b505050506040513d601f19601f820116820180604052508101906100d79190610185565b90503660008037600080366000845af43d6000803e8080156100f8573d6000f35b3d6000fd5b61011061010b366004610161565b610112565b005b60008061014060017fa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d516101a2565b8054925090506001600160a01b0382161561015a57600080fd5b9190915550565b60006020828403121561017357600080fd5b813561017e816101c7565b9392505050565b60006020828403121561019757600080fd5b815161017e816101c7565b6000828210156101c257634e487b7160e01b600052601160045260246000fd5b500390565b6001600160a01b03811681146101dc57600080fd5b5056fea2646970667358221220e6ae4b3dc2474e43ff609e19eb520ce54b6f38170a43a6f96541360be5efc2b464736f6c63430008060033";

    bytes32 constant internal SIMPLE_TOKEN_PROXY_HASH = keccak256(SIMPLE_TOKEN_PROXY_BYTECODE);

    bytes4 constant internal SET_META_DATA_SIG = bytes4(keccak256("initAndObtainOwnership(bytes32,bytes32,uint256,address)"));
    bytes4 constant internal SET_BEACON_SIG = bytes4(keccak256("setBeacon(address)"));

    function deploySimpleTokenProxy(address bridge, bytes32 salt, ICrossChainBridge.Metadata memory metaData) internal returns (address) {
        /* lets concat bytecode with constructor parameters */
        bytes memory bytecode = SIMPLE_TOKEN_PROXY_BYTECODE;
        /* deploy new contract and store contract address in result variable */
        address result;
        assembly {
            result := create2(0, add(bytecode, 0x20), mload(bytecode), salt)
        }
        require(result != address(0x00), "deploy failed");
        /* setup impl */
        (bool success,) = result.call(abi.encodePacked(SET_BEACON_SIG, abi.encode(bridge)));
        require(success, "setBeacon failed");
        /* setup meta data */
        (success,) = result.call(abi.encodePacked(SET_META_DATA_SIG, abi.encode(metaData)));
        require(success, "set metadata failed");
        /* return generated contract address */
        return result;
    }

    function simpleTokenProxyAddress(address deployer, bytes32 salt) internal pure returns (address) {
        bytes32 bytecodeHash = keccak256(SIMPLE_TOKEN_PROXY_BYTECODE);
        bytes32 hash = keccak256(abi.encodePacked(uint8(0xff), address(deployer), salt, bytecodeHash));
        return address(bytes20(hash << 96));
    }
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.6;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IERC20Mintable {

    function mint(address account, uint256 amount) external;

    function burn(address account, uint256 amount) external;
}

interface IERC20Pegged {

    function getOrigin() external view returns (uint256, address);
}

interface IERC20Extra {

    function name() external returns (string memory);

    function decimals() external returns (uint8);

    function symbol() external returns (string memory);
}

interface IERC20MetadataChangeable {

    event NameChanged(string prevValue, string newValue);

    event SymbolChanged(string prevValue, string newValue);

    function changeName(bytes32) external;

    function changeSymbol(bytes32) external;
}

interface IERC20InternetBond {

    function ratio() external view returns (uint256);

    function isRebasing() external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity ^0.8.6;

import "../interfaces/IERC20.sol";

interface ICrossChainBridge {

    event ContractAllowed(address contractAddress, uint256 toChain);
    event ContractDisallowed(address contractAddress, uint256 toChain);
    event ConsensusChanged(address consensusAddress);
    event TokenImplementationChanged(address consensusAddress);
    event BondImplementationChanged(address consensusAddress);

    struct Metadata {
        bytes32 symbol;
        bytes32 name;
        uint256 originChain;
        address originAddress;
        bytes32 bondMetadata; // encoded metadata version, bond type
    }

    event DepositLocked(
        uint256 chainId,
        address indexed fromAddress,
        address indexed toAddress,
        address fromToken,
        address toToken,
        uint256 totalAmount,
        Metadata metadata
    );
    event DepositBurned(
        uint256 chainId,
        address indexed fromAddress,
        address indexed toAddress,
        address fromToken,
        address toToken,
        uint256 totalAmount,
        Metadata metadata,
        address originToken
    );

    event WithdrawMinted(
        bytes32 receiptHash,
        address indexed fromAddress,
        address indexed toAddress,
        address fromToken,
        address toToken,
        uint256 totalAmount
    );
    event WithdrawUnlocked(
        bytes32 receiptHash,
        address indexed fromAddress,
        address indexed toAddress,
        address fromToken,
        address toToken,
        uint256 totalAmount
    );

    enum InternetBondType {
        NOT_BOND,
        REBASING_BOND,
        NONREBASING_BOND
    }

    function isPeggedToken(address toToken) external returns (bool);

    function deposit(uint256 toChain, address toAddress) payable external;

    function deposit(address fromToken, uint256 toChain, address toAddress, uint256 amount) external;

    function withdraw(bytes calldata encodedProof, bytes calldata rawReceipt, bytes calldata receiptRootSignature) external;

    function factoryPeggedToken(uint256 fromChain, Metadata calldata metaData) external;

    function factoryPeggedBond(uint256 fromChain, Metadata calldata metaData) external;

    function getTokenImplementation() external returns (address);

    function getBondImplementation() external returns (address);

}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "berlin",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"stateMutability":"nonpayable","type":"fallback"},{"inputs":[{"internalType":"address","name":"newBeacon","type":"address"}],"name":"setBeacon","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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