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// SPDX-License-Identifier: MIT
pragma solidity 0.8.6;

import "./interfaces/IBeamToken.sol";

contract Migrator {

    IBeamToken public immutable source;
    IBeamToken public immutable destination;
    uint256 public immutable migrationRate;
    uint256 public constant DECIMAL_PRECISION = 1e18;

    event Migrated(address indexed migrant, uint256 indexed destinationAmount);

    constructor(address _source, address _destination, uint256 _migrationRate) {
        require(address(_source) != address(0), "Source cannot be zero address");
        require(address(_destination) != address(0), "Destination cannot be zero address");
        require(_migrationRate > 0, "Migration rate cannot be zero");
        source = IBeamToken(_source);
        destination = IBeamToken(_destination);
        migrationRate = _migrationRate;
    }

    function migrate(uint256 _sourceAmount) external {
        uint256 destinationAmount = _sourceAmount * migrationRate / DECIMAL_PRECISION;
        source.burn(msg.sender, _sourceAmount);
        destination.mint(msg.sender, destinationAmount);
        emit Migrated(msg.sender, destinationAmount);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.6;

import "@openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IBeamToken is IERC20, IERC20Permit {
    function mint(address _to, uint256 _amount) external;
    function burn(address _from, uint256 _amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}

{
  "metadata": {
    "bytecodeHash": "none"
  },
  "optimizer": {
    "enabled": true,
    "runs": 800
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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

000000000000000000000000949d48eca67b17269629c7194f4b727d4ef9e5d600000000000000000000000062d0a8458ed7719fdaf978fe5929c6d342b0bfce0000000000000000000000000000000000000000000000056bc75e2d63100000

-----Decoded View---------------
Arg [0] : _source (address): 0x949D48EcA67b17269629c7194F4b727d4Ef9E5d6
Arg [1] : _destination (address): 0x62D0A8458eD7719FDAF978fe5929C6D342B0bFcE
Arg [2] : _migrationRate (uint256): 100000000000000000000

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000949d48eca67b17269629c7194f4b727d4ef9e5d6
Arg [1] : 00000000000000000000000062d0a8458ed7719fdaf978fe5929c6d342b0bfce
Arg [2] : 0000000000000000000000000000000000000000000000056bc75e2d63100000