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// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/ERC1967/ERC1967Proxy.sol)
pragma solidity 0.8.17;
// OpenZeppelin Contracts v4.4.1 (proxy/Proxy.sol)
/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
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// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity 0.8.17;
// Created By: Art Blocks Inc.
import "../interfaces/0.8.x/IRandomizerV2.sol";
import "../interfaces/0.8.x/IAdminACLV0.sol";
import "../interfaces/0.8.x/IGenArt721CoreContractV3.sol";
import "../interfaces/0.8.x/IManifold.sol";
import "@openzeppelin-4.7/contracts/utils/Strings.sol";
import "@openzeppelin-4.7/contracts/access/Ownable.sol";
import "../libs/0.8.x/ERC721_PackedHashSeed.sol";
import "../libs/0.8.x/BytecodeStorage.sol";
import "../libs/0.8.x/Bytes32Strings.sol";
/**
 * @title Art Blocks ERC-721 core contract, V3_Explorations.
 * @author Art Blocks Inc.
 * @notice Privileged Roles and Ownership:
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// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "./lib/ReentrancyGuarded.sol";
import "./lib/EIP712.sol";
import "./lib/MerkleVerifier.sol";
import "./interfaces/IBlurExchange.sol";
import "./interfaces/IExecutionDelegate.sol";
import "./interfaces/IPolicyManager.sol";
import "./interfaces/IMatchingPolicy.sol";
import {
  Side,
  SignatureVersion,
  AssetType,
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// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {EnumerableSet} from "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import {IPolicyManager} from "./interfaces/IPolicyManager.sol";
/**
 * @title PolicyManager
 * @dev Manages the policy whitelist for the Blur exchange
 */
contract PolicyManager is IPolicyManager, Ownable {
    using EnumerableSet for EnumerableSet.AddressSet;
    EnumerableSet.AddressSet private _whitelistedPolicies;
    event PolicyRemoved(address indexed policy);
    event PolicyWhitelisted(address indexed policy);
    /**
     * @notice Add matching policy
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// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import {Order, AssetType} from "../lib/OrderStructs.sol";
import {IMatchingPolicy} from "../interfaces/IMatchingPolicy.sol";
/**
 * @title StandardPolicyERC721
 * @dev Policy for matching orders at a fixed price for a specific ERC721 tokenId
 */
contract StandardPolicyERC721 is IMatchingPolicy {
    function canMatchMakerAsk(Order calldata makerAsk, Order calldata takerBid)
        external
        pure
        override
        returns (
            bool,
            uint256,
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// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import {IExecutionDelegate} from "./interfaces/IExecutionDelegate.sol";
/**
 * @title ExecutionDelegate
 * @dev Proxy contract to manage user token approvals
 */
contract ExecutionDelegate is IExecutionDelegate, Ownable {
    using Address for address;
    mapping(address => bool) public contracts;
    mapping(address => bool) public revokedApproval;
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