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// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

import {IBeacon} from "@openzeppelin/contracts/proxy/beacon/IBeacon.sol";

/**
 * @dev This contract implements a proxy that gets the implementation address for each call from an {UpgradeableBeacon}.
 *
 * The beacon address is stored in storage slot `uint256(keccak256('eip1967.proxy.beacon')) - 1`, so that it doesn't
 * conflict with the storage layout of the implementation behind the proxy.
 */
contract FairxyzBeaconProxy {
    /**
     * @dev Emitted when the beacon is upgraded.
     */
    event BeaconUpgraded(address indexed beacon);

    struct AddressSlot {
        address value;
    }

    /**
     * @dev The storage slot of the Beacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT =
        0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Initializes the proxy, upgrading to beacon `beacon`.
     *
     * If `data` is nonempty, it's used as data in a delegate call to the implementation returned by the beacon. This
     * will typically be an encoded function call, and allows initializing the storage of the proxy like a Solidity
     * constructor.
     *
     * Requirements:
     *
     * - `beacon` must be a contract with the interface {IBeacon}.
     */
    constructor(address beacon, bytes memory data) payable {
        _upgradeBeaconToAndCall(beacon, data);
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback() external payable virtual {
        _delegate(_implementation());
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive() external payable virtual {
        _delegate(_implementation());
    }

    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internal call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(
                gas(),
                implementation,
                0,
                calldatasize(),
                0,
                0
            )

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 {
                revert(0, returndatasize())
            }
            default {
                return(0, returndatasize())
            }
        }
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function _getAddressSlot(
        bytes32 slot
    ) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns the current implementation address of the associated beacon.
     */
    function _implementation() internal view virtual returns (address) {
        return IBeacon(_getAddressSlot(_BEACON_SLOT).value).implementation();
    }

    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data
    ) internal {
        require(
            newBeacon.code.length > 0,
            "ERC1967: new beacon is not a contract"
        );

        address implementation = IBeacon(newBeacon).implementation();

        require(
            implementation.code.length > 0,
            "ERC1967: beacon implementation is not a contract"
        );

        _getAddressSlot(_BEACON_SLOT).value = newBeacon;

        emit BeaconUpgraded(newBeacon);

        if (data.length > 0) {
            (bool success, bytes memory returndata) = implementation
                .delegatecall(data);

            if (!success) {
                if (returndata.length > 0) {
                    assembly {
                        let returndata_size := mload(returndata)
                        revert(add(32, returndata), returndata_size)
                    }
                } else {
                    revert("Address: low-level delegate call failed");
                }
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"beacon","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"stateMutability":"payable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"beacon","type":"address"}],"name":"BeaconUpgraded","type":"event"},{"stateMutability":"payable","type":"fallback"},{"stateMutability":"payable","type":"receive"}]

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-----Decoded View---------------
Arg [0] : beacon (address): 0xE1b12cf925475Dd0B019CA5B992edc68fa33d5Fa
Arg [1] : data (bytes): 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

-----Encoded View---------------
33 Constructor Arguments found :
Arg [0] : 000000000000000000000000e1b12cf925475dd0b019ca5b992edc68fa33d5fa
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [2] : 00000000000000000000000000000000000000000000000000000000000003a4
Arg [3] : 65a79c8d00000000000000000000000000000000000000000000000000000000
Arg [4] : 000000c000000000000000000000000000000000000000000000000000000000
Arg [5] : 00000100000000000000000000000000a418734c291ecb1b694ffc5ab7fcd0d1
Arg [6] : 2a496ed300000000000000000000000000000000000000000000000000000000
Arg [7] : 000001f400000000000000000000000000000000000000000000000000000000
Arg [8] : 0000014000000000000000000000000000000000000000000000000000000000
Arg [9] : 0000000100000000000000000000000000000000000000000000000000000000
Arg [10] : 000000124d7574616e742043617274656c204f61746800000000000000000000
Arg [11] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [12] : 000000044f415448000000000000000000000000000000000000000000000000
Arg [13] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [14] : 0000000100000000000000000000000000000000000000000000000000000000
Arg [15] : 0000002000000000000000000000000000000000000000000000000000000000
Arg [16] : 0000001000000000000000000000000000000000000000000000000000000000
Arg [17] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [18] : 0000072e00000000000000000000000000000000000000000000000000000000
Arg [19] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [20] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [21] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [22] : 0000010000000000000000000000000000000000000000000000000000000000
Arg [23] : 0000016000000000000000000000000000000000000000000000000000000000
Arg [24] : 00000036697066733a2f2f516d633459456b78343163566f6b525462464a796d
Arg [25] : 65344573435758714455676b44543272364143434e584854323f000000000000
Arg [26] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [27] : 0000000100000000000000000000000000000000000000000000000000000000
Arg [28] : 649df0d000000000000000000000000000000000000000000000000000000000
Arg [29] : a954f98000000000000000000000000000000000000000000000000000000000
Arg [30] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [31] : 0000072e00000000000000000000000000000000000000000000000000000000
Arg [32] : 0000000000000000000000000000000000000000000000000000000000000000