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// SPDX-License-Identifier: AGPL-3.0
pragma solidity 0.8.10;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";

/**
* @dev Interface to interact with POAP contract
* - Limited functionality as needed
**/
interface IPoap {
    function mintToken(uint256 eventId, uint256 tokenId, address to) external returns (bool);

    function renounceAdmin() external;
}

/**
 * @title POAP Bridge contract
 * @dev Migrate POAP from the main chain to a secondary chain
 * - Users can:
 *   # Set migration fee
 *   # Set migration fee receiver
 *   # Renounce as Admin of POAP contract
 *   # Migrate a POAP
 *   # Pause contract if admin
 *   # Unpause contract if admin
 * @author POAP
 * - Developers:
 *   # Agustin Lavarello
 *   # Rodrigo Manuel Navarro Lajous
 *   # Ramiro Gonzales
**/
contract PoapBridge is Ownable, Pausable {

    /**
     * @dev Emitted when signature is verified
     */
    event VerifiedSignature(
        bytes _signature
    );

    /**
     * @dev Emitted when the signer changes
     */
    event ValidSignerChange(
        address indexed previousValidSigner,
        address indexed newValidSigner
    );

    /**
     * @dev Emitted when the fee receiver changes
     */
    event FeeReceiverChange(
        address indexed previousFeeReceiver,
        address indexed newFeeReceiver
    );

    /**
     * @dev Emitted when the migration fee changes
     */
    event MigrationFeeChange(
        uint256 indexed previousFeeReceiver,
        uint256 indexed newFeeReceiver
    );

    using ECDSA for bytes32;

    // Name of the contract
    string public constant NAME = "POAP Bridge";

    // Interface to interact with POAP contract
    // solhint-disable-next-line var-name-mixedcase
    IPoap immutable private POAPToken;

    // POAP valid token minter
    address public validSigner;

    // POAP fee receiver
    address payable public feeReceiver;

    // POAP fee
    uint256 public migrationFee;

    // Processed signatures
    mapping(bytes => bool) public processed;

    constructor (
        address _poapContractAddress,
        address _validSigner,
        address payable _feeReceiver,
        uint256 _migrationFee
    ) {
        require(_validSigner != address(0), "The zero address can't be a valid signer");
        validSigner = _validSigner;
        POAPToken = IPoap(_poapContractAddress);
        feeReceiver = _feeReceiver;
        migrationFee = _migrationFee;
    }
    
    /**
     * @dev Called by the owner to pause, triggers stopped state.
     * Requires 
     * - The msg sender to be the owner
     */
    function pause() external onlyOwner {
        _pause();
    }

     /**
     * @dev Called by the owner to pause, triggers unstopped state.
     * Requires 
     * - The msg sender to be the owner
     */
    function unpause() external onlyOwner {
        _unpause();
    }

    /**
     * @dev Sets address that will receive the migration fee
     * Requires 
     * - The msg sender to be the owner
     * @param _feeReceiver ( address payable ) The address that will receive the fee
     */
    function setFeeReceiver(address payable _feeReceiver) external onlyOwner {
        address oldFeeReceiver = feeReceiver;
        feeReceiver = _feeReceiver;
        emit FeeReceiverChange(oldFeeReceiver, _feeReceiver);
    }

    /**
     * @dev Sets address fee to be charged for migration
     * Requires 
     * - The msg sender to be the owner
     * @param _migrationFee ( uint256 ) The amount of wei to charge
     */
    function setMigrationFee(uint256 _migrationFee) external onlyOwner {
        uint256 oldMigrationFee = migrationFee;
        migrationFee = _migrationFee;
        emit MigrationFeeChange(oldMigrationFee, _migrationFee);
    }

    /**
     * @dev Sets valid signer, the signer can sign the message to migrate a poap
     * Requires
     * - The msg sender to be the owner
     * - The _validSigner not to be the zero address
     * @param _validSigner ( address ) The new valid signer
     */
    function setValidSigner(address _validSigner) external onlyOwner {
        require(_validSigner != address(0), "The zero address can't be a valid signer");
        address oldValidSigner = validSigner;
        validSigner = _validSigner;
        emit ValidSignerChange(oldValidSigner, _validSigner);
    }

    /**
     * @dev Function to renounce as Admin in POAP contract
     * Requires 
     * - The msg sender to be the owner
     */
    function renouncePoapAdmin() external onlyOwner {
        POAPToken.renounceAdmin();
    }

    /**
     * @dev Function to verify signature
     * @param _eventId ( uint256 ) EventId for the token
     * @param _tokenId ( uint256 ) The token id to mint.
     * @param _receiver ( address ) The address that will receive the minted tokens.
     * @param _expirationTime ( uint256 ) Token expiration time.
     * @param _signature ( bytes ) Signature of the message digest.
     * @return A boolean that indicates if the signature is valid.
     */
    function isValidSignature(
        uint256 _eventId,
        uint256 _tokenId,
        address _receiver,
        uint256 _expirationTime,
        bytes memory _signature
    ) private view returns(bool) {
        require(_signature.length == 65, "Unsupported signature length");
        bytes32 message = keccak256(abi.encodePacked(_eventId, _tokenId, _receiver, _expirationTime));
        return message.recover(_signature) == validSigner;
    }

    /**
     * @dev Function to mint tokens
     * Requires 
     * - The sender to send value equal to or greater than the fee
     * - The contract must not be paused
     * @param eventId ( uint256 ) EventId for the token
     * @param tokenId ( uint256 ) The token id to mint.
     * @param receiver ( address ) The address that will receive the minted tokens.
     * @param expirationTime ( uint256 ) Token expiration time.
     * @param signature ( bytes ) Signature of the message digest.
     * @return A boolean that indicates if the operation was successful.
     */
    function mintToken(
        uint256 eventId,
        uint256 tokenId,
        address receiver,
        uint256 expirationTime,
        bytes calldata signature
    ) external payable whenNotPaused returns (bool) {
        // Check that the timestamp hasn't expired
        // solhint-disable-next-line not-rely-on-time
        require(block.timestamp < expirationTime, "Signature expired");
        // Check that the user pay the migration fee
        require(msg.value >= migrationFee, "Insufficient payment");
        // Check that the signature is valid
        require(isValidSignature(eventId, tokenId, receiver, expirationTime, signature), "Invalid signature");
        // Check that the signature was not already processed
        require(processed[signature] == false, "Signature already processed");

        processed[signature] = true;

        // Send the message value to the receiver
        feeReceiver.transfer(msg.value);

        emit VerifiedSignature(signature);
        return POAPToken.mintToken(eventId, tokenId, receiver);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 27)
        }
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

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

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00000000000000000000000022c1f6050e56d2876009903609a2cc3fef83b415000000000000000000000000fd008299cccd1287b2d7e51a63fbbe52c45da255000000000000000000000000f6b6f07862a02c85628b3a9688beae07fea9c863000000000000000000000000000000000000000000000000016345785d8a0000

-----Decoded View---------------
Arg [0] : _poapContractAddress (address): 0x22C1f6050E56d2876009903609a2cC3fEf83B415
Arg [1] : _validSigner (address): 0xFd008299CCCd1287B2D7E51A63fBbe52C45Da255
Arg [2] : _feeReceiver (address): 0xf6B6F07862A02C85628B3A9688beae07fEA9C863
Arg [3] : _migrationFee (uint256): 100000000000000000

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 00000000000000000000000022c1f6050e56d2876009903609a2cc3fef83b415
Arg [1] : 000000000000000000000000fd008299cccd1287b2d7e51a63fbbe52c45da255
Arg [2] : 000000000000000000000000f6b6f07862a02c85628b3a9688beae07fea9c863
Arg [3] : 000000000000000000000000000000000000000000000000016345785d8a0000