// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.8.0;

/// @title BeaconProxy
/// @custom:security-contact [email protected]
/// @author Euler Labs (https://www.eulerlabs.com/)
/// @notice A proxy contract, forwarding all calls to an implementation contract, fetched from a beacon
/// @dev The proxy attaches up to 128 bytes of metadata to the delegated call data.
contract BeaconProxy {
    // ERC-1967 beacon address slot. bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)
    bytes32 internal constant BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;
    // Beacon implementation() selector
    bytes32 internal constant IMPLEMENTATION_SELECTOR =
        0x5c60da1b00000000000000000000000000000000000000000000000000000000;
    // Max trailing data length, 4 immutable slots
    uint256 internal constant MAX_TRAILING_DATA_LENGTH = 128;

    address internal immutable beacon;
    uint256 internal immutable metadataLength;
    bytes32 internal immutable metadata0;
    bytes32 internal immutable metadata1;
    bytes32 internal immutable metadata2;
    bytes32 internal immutable metadata3;

    event Genesis();

    constructor(bytes memory trailingData) {
        emit Genesis();

        require(trailingData.length <= MAX_TRAILING_DATA_LENGTH, "trailing data too long");

        // Beacon is always the proxy creator; store it in immutable
        beacon = msg.sender;

        // Store the beacon address in ERC-1967 slot for compatibility with block explorers
        assembly {
            sstore(BEACON_SLOT, caller())
        }

        // Record length as immutable
        metadataLength = trailingData.length;

        // Pad length with uninitialized memory so the decode will succeed
        assembly {
            mstore(trailingData, MAX_TRAILING_DATA_LENGTH)
        }
        (metadata0, metadata1, metadata2, metadata3) = abi.decode(trailingData, (bytes32, bytes32, bytes32, bytes32));
    }

    fallback() external payable {
        address beacon_ = beacon;
        uint256 metadataLength_ = metadataLength;
        bytes32 metadata0_ = metadata0;
        bytes32 metadata1_ = metadata1;
        bytes32 metadata2_ = metadata2;
        bytes32 metadata3_ = metadata3;

        assembly {
            // Fetch implementation address from the beacon
            mstore(0, IMPLEMENTATION_SELECTOR)
            // Implementation call is trusted not to revert and to return an address
            let result := staticcall(gas(), beacon_, 0, 4, 0, 32)
            let implementation := mload(0)

            // delegatecall to the implementation with trailing metadata
            calldatacopy(0, 0, calldatasize())
            mstore(calldatasize(), metadata0_)
            mstore(add(32, calldatasize()), metadata1_)
            mstore(add(64, calldatasize()), metadata2_)
            mstore(add(96, calldatasize()), metadata3_)
            result := delegatecall(gas(), implementation, 0, add(metadataLength_, calldatasize()), 0, 0)
            returndatacopy(0, 0, returndatasize())

            switch result
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }
}

{
  "remappings": [
    "openzeppelin-contracts/=lib/openzeppelin-contracts/contracts/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "ethereum-vault-connector/=lib/ethereum-vault-connector/src/",
    "evc/=lib/ethereum-vault-connector/src/",
    "evk/=lib/euler-vault-kit/src/",
    "evk-test/=lib/euler-vault-kit/test/",
    "euler-price-oracle/=lib/euler-price-oracle/src/",
    "euler-price-oracle-test/=lib/euler-price-oracle/test/",
    "fee-flow/=lib/fee-flow/src/",
    "reward-streams/=lib/reward-streams/src/",
    "lib/euler-price-oracle:@openzeppelin/contracts/=lib/euler-price-oracle/lib/openzeppelin-contracts/contracts/",
    "@openzeppelin/=lib/openzeppelin-contracts/contracts/",
    "euler-earn/=lib/euler-earn/src/",
    "@openzeppelin-upgradeable/=lib/euler-earn/lib/openzeppelin-contracts-upgradeable/contracts/",
    "@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "@pendle/core-v2/=lib/euler-price-oracle/lib/pendle-core-v2-public/contracts/",
    "@pyth/=lib/euler-price-oracle/lib/pyth-sdk-solidity/",
    "@redstone/evm-connector/=lib/euler-price-oracle/lib/redstone-oracles-monorepo/packages/evm-connector/contracts/",
    "@solady/=lib/euler-price-oracle/lib/solady/src/",
    "@uniswap/v3-core/=lib/euler-price-oracle/lib/v3-core/",
    "@uniswap/v3-periphery/=lib/euler-price-oracle/lib/v3-periphery/",
    "ERC4626/=lib/euler-earn/lib/properties/lib/ERC4626/contracts/",
    "crytic-properties/=lib/euler-earn/lib/properties/contracts/",
    "ds-test/=lib/ethereum-vault-connector/lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "euler-vault-kit/=lib/euler-vault-kit/src/",
    "forge-gas-snapshot/=lib/euler-vault-kit/lib/permit2/lib/forge-gas-snapshot/src/",
    "forge-std/=lib/forge-std/src/",
    "halmos-cheatcodes/=lib/openzeppelin-contracts-upgradeable/lib/halmos-cheatcodes/src/",
    "openzeppelin/=lib/ethereum-vault-connector/lib/openzeppelin-contracts/contracts/",
    "pendle-core-v2-public/=lib/euler-price-oracle/lib/pendle-core-v2-public/contracts/",
    "permit2/=lib/euler-vault-kit/lib/permit2/",
    "properties/=lib/euler-earn/lib/properties/contracts/",
    "pyth-sdk-solidity/=lib/euler-price-oracle/lib/pyth-sdk-solidity/",
    "redstone-oracles-monorepo/=lib/euler-price-oracle/lib/",
    "solady/=lib/euler-price-oracle/lib/solady/src/",
    "solmate/=lib/fee-flow/lib/solmate/src/",
    "v3-core/=lib/euler-price-oracle/lib/v3-core/contracts/",
    "v3-periphery/=lib/euler-price-oracle/lib/v3-periphery/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 20000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "cancun",
  "viaIR": false,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"bytes","name":"trailingData","type":"bytes"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[],"name":"Genesis","type":"event"},{"stateMutability":"payable","type":"fallback"}]

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