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    Contract Diff Checker

    Contract Name:
    InitializableImmutableAdminUpgradeabilityProxy

    Contract Source Code:

    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
    
    pragma solidity ^0.8.0;
    
    /**
     * @dev Collection of functions related to the address type
     */
    library Address {
      /**
       * @dev Returns true if `account` is a contract.
       *
       * [IMPORTANT]
       * ====
       * It is unsafe to assume that an address for which this function returns
       * false is an externally-owned account (EOA) and not a contract.
       *
       * Among others, `isContract` will return false for the following
       * types of addresses:
       *
       *  - an externally-owned account
       *  - a contract in construction
       *  - an address where a contract will be created
       *  - an address where a contract lived, but was destroyed
       * ====
       */
      function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
    
        uint256 size;
        assembly {
          size := extcodesize(account)
        }
        return size > 0;
      }
    
      /**
       * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
       * `recipient`, forwarding all available gas and reverting on errors.
       *
       * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
       * of certain opcodes, possibly making contracts go over the 2300 gas limit
       * imposed by `transfer`, making them unable to receive funds via
       * `transfer`. {sendValue} removes this limitation.
       *
       * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
       *
       * IMPORTANT: because control is transferred to `recipient`, care must be
       * taken to not create reentrancy vulnerabilities. Consider using
       * {ReentrancyGuard} or the
       * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
       */
      function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, 'Address: insufficient balance');
    
        (bool success, ) = recipient.call{value: amount}('');
        require(success, 'Address: unable to send value, recipient may have reverted');
      }
    
      /**
       * @dev Performs a Solidity function call using a low level `call`. A
       * plain `call` is an unsafe replacement for a function call: use this
       * function instead.
       *
       * If `target` reverts with a revert reason, it is bubbled up by this
       * function (like regular Solidity function calls).
       *
       * Returns the raw returned data. To convert to the expected return value,
       * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
       *
       * Requirements:
       *
       * - `target` must be a contract.
       * - calling `target` with `data` must not revert.
       *
       * _Available since v3.1._
       */
      function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, 'Address: low-level call failed');
      }
    
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
       * `errorMessage` as a fallback revert reason when `target` reverts.
       *
       * _Available since v3.1._
       */
      function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
      ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
      }
    
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
       * but also transferring `value` wei to `target`.
       *
       * Requirements:
       *
       * - the calling contract must have an ETH balance of at least `value`.
       * - the called Solidity function must be `payable`.
       *
       * _Available since v3.1._
       */
      function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
      ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, 'Address: low-level call with value failed');
      }
    
      /**
       * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
       * with `errorMessage` as a fallback revert reason when `target` reverts.
       *
       * _Available since v3.1._
       */
      function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
      ) internal returns (bytes memory) {
        require(address(this).balance >= value, 'Address: insufficient balance for call');
        require(isContract(target), 'Address: call to non-contract');
    
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
      }
    
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
       * but performing a static call.
       *
       * _Available since v3.3._
       */
      function functionStaticCall(
        address target,
        bytes memory data
      ) internal view returns (bytes memory) {
        return functionStaticCall(target, data, 'Address: low-level static call failed');
      }
    
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
       * but performing a static call.
       *
       * _Available since v3.3._
       */
      function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
      ) internal view returns (bytes memory) {
        require(isContract(target), 'Address: static call to non-contract');
    
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
      }
    
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
       * but performing a delegate call.
       *
       * _Available since v3.4._
       */
      function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, 'Address: low-level delegate call failed');
      }
    
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
       * but performing a delegate call.
       *
       * _Available since v3.4._
       */
      function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
      ) internal returns (bytes memory) {
        require(isContract(target), 'Address: delegate call to non-contract');
    
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
      }
    
      /**
       * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
       * revert reason using the provided one.
       *
       * _Available since v4.3._
       */
      function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
      ) internal pure returns (bytes memory) {
        if (success) {
          return returndata;
        } else {
          // Look for revert reason and bubble it up if present
          if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
    
            assembly {
              let returndata_size := mload(returndata)
              revert(add(32, returndata), returndata_size)
            }
          } else {
            revert(errorMessage);
          }
        }
      }
    }

    // SPDX-License-Identifier: AGPL-3.0
    pragma solidity ^0.8.0;
    
    import './Proxy.sol';
    import '../contracts/Address.sol';
    
    /**
     * @title BaseUpgradeabilityProxy
     * @dev This contract implements a proxy that allows to change the
     * implementation address to which it will delegate.
     * Such a change is called an implementation upgrade.
     */
    contract BaseUpgradeabilityProxy is Proxy {
      /**
       * @dev Emitted when the implementation is upgraded.
       * @param implementation Address of the new implementation.
       */
      event Upgraded(address indexed implementation);
    
      /**
       * @dev Storage slot with the address of the current implementation.
       * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
       * validated in the constructor.
       */
      bytes32 internal constant IMPLEMENTATION_SLOT =
        0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
    
      /**
       * @dev Returns the current implementation.
       * @return impl Address of the current implementation
       */
      function _implementation() internal view override returns (address impl) {
        bytes32 slot = IMPLEMENTATION_SLOT;
        //solium-disable-next-line
        assembly {
          impl := sload(slot)
        }
      }
    
      /**
       * @dev Upgrades the proxy to a new implementation.
       * @param newImplementation Address of the new implementation.
       */
      function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
      }
    
      /**
       * @dev Sets the implementation address of the proxy.
       * @param newImplementation Address of the new implementation.
       */
      function _setImplementation(address newImplementation) internal {
        require(
          Address.isContract(newImplementation),
          'Cannot set a proxy implementation to a non-contract address'
        );
    
        bytes32 slot = IMPLEMENTATION_SLOT;
    
        //solium-disable-next-line
        assembly {
          sstore(slot, newImplementation)
        }
      }
    }

    // SPDX-License-Identifier: AGPL-3.0
    pragma solidity ^0.8.0;
    
    import './BaseUpgradeabilityProxy.sol';
    
    /**
     * @title InitializableUpgradeabilityProxy
     * @dev Extends BaseUpgradeabilityProxy with an initializer for initializing
     * implementation and init data.
     */
    contract InitializableUpgradeabilityProxy is BaseUpgradeabilityProxy {
      /**
       * @dev Contract initializer.
       * @param _logic Address of the initial implementation.
       * @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
       * It should include the signature and the parameters of the function to be called, as described in
       * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
       * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
       */
      function initialize(address _logic, bytes memory _data) public payable {
        require(_implementation() == address(0));
        assert(IMPLEMENTATION_SLOT == bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1));
        _setImplementation(_logic);
        if (_data.length > 0) {
          (bool success, ) = _logic.delegatecall(_data);
          require(success);
        }
      }
    }

    // SPDX-License-Identifier: AGPL-3.0
    pragma solidity ^0.8.0;
    
    /**
     * @title Proxy
     * @dev Implements delegation of calls to other contracts, with proper
     * forwarding of return values and bubbling of failures.
     * It defines a fallback function that delegates all calls to the address
     * returned by the abstract _implementation() internal function.
     */
    abstract contract Proxy {
      /**
       * @dev Fallback function.
       * Will run if no other function in the contract matches the call data.
       * Implemented entirely in `_fallback`.
       */
      fallback() external payable {
        _fallback();
      }
    
      /**
       * @return The Address of the implementation.
       */
      function _implementation() internal view virtual returns (address);
    
      /**
       * @dev Delegates execution to an implementation contract.
       * This is a low level function that doesn't return to its internal call site.
       * It will return to the external caller whatever the implementation returns.
       * @param implementation Address to delegate.
       */
      function _delegate(address implementation) internal {
        //solium-disable-next-line
        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 Function that is run as the first thing in the fallback function.
       * Can be redefined in derived contracts to add functionality.
       * Redefinitions must call super._willFallback().
       */
      function _willFallback() internal virtual {}
    
      /**
       * @dev fallback implementation.
       * Extracted to enable manual triggering.
       */
      function _fallback() internal {
        _willFallback();
        _delegate(_implementation());
      }
    }

    // SPDX-License-Identifier: AGPL-3.0
    pragma solidity ^0.8.0;
    
    import {BaseUpgradeabilityProxy} from '../../../dependencies/openzeppelin/upgradeability/BaseUpgradeabilityProxy.sol';
    
    /**
     * @title BaseImmutableAdminUpgradeabilityProxy
     * @author Aave, inspired by the OpenZeppelin upgradeability proxy pattern
     * @notice This contract combines an upgradeability proxy with an authorization
     * mechanism for administrative tasks.
     * @dev The admin role is stored in an immutable, which helps saving transactions costs
     * All external functions in this contract must be guarded by the
     * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity
     * feature proposal that would enable this to be done automatically.
     */
    contract BaseImmutableAdminUpgradeabilityProxy is BaseUpgradeabilityProxy {
      address internal immutable _admin;
    
      /**
       * @dev Constructor.
       * @param admin The address of the admin
       */
      constructor(address admin) {
        _admin = admin;
      }
    
      modifier ifAdmin() {
        if (msg.sender == _admin) {
          _;
        } else {
          _fallback();
        }
      }
    
      /**
       * @notice Return the admin address
       * @return The address of the proxy admin.
       */
      function admin() external ifAdmin returns (address) {
        return _admin;
      }
    
      /**
       * @notice Return the implementation address
       * @return The address of the implementation.
       */
      function implementation() external ifAdmin returns (address) {
        return _implementation();
      }
    
      /**
       * @notice Upgrade the backing implementation of the proxy.
       * @dev Only the admin can call this function.
       * @param newImplementation The address of the new implementation.
       */
      function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeTo(newImplementation);
      }
    
      /**
       * @notice Upgrade the backing implementation of the proxy and call a function
       * on the new implementation.
       * @dev This is useful to initialize the proxied contract.
       * @param newImplementation The address of the new implementation.
       * @param data Data to send as msg.data in the low level call.
       * It should include the signature and the parameters of the function to be called, as described in
       * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
       */
      function upgradeToAndCall(
        address newImplementation,
        bytes calldata data
      ) external payable ifAdmin {
        _upgradeTo(newImplementation);
        (bool success, ) = newImplementation.delegatecall(data);
        require(success);
      }
    
      /**
       * @notice Only fall back when the sender is not the admin.
       */
      function _willFallback() internal virtual override {
        require(msg.sender != _admin, 'Cannot call fallback function from the proxy admin');
        super._willFallback();
      }
    }

    // SPDX-License-Identifier: AGPL-3.0
    pragma solidity ^0.8.0;
    
    import {InitializableUpgradeabilityProxy} from '../../../dependencies/openzeppelin/upgradeability/InitializableUpgradeabilityProxy.sol';
    import {Proxy} from '../../../dependencies/openzeppelin/upgradeability/Proxy.sol';
    import {BaseImmutableAdminUpgradeabilityProxy} from './BaseImmutableAdminUpgradeabilityProxy.sol';
    
    /**
     * @title InitializableAdminUpgradeabilityProxy
     * @author Aave
     * @dev Extends BaseAdminUpgradeabilityProxy with an initializer function
     */
    contract InitializableImmutableAdminUpgradeabilityProxy is
      BaseImmutableAdminUpgradeabilityProxy,
      InitializableUpgradeabilityProxy
    {
      /**
       * @dev Constructor.
       * @param admin The address of the admin
       */
      constructor(address admin) BaseImmutableAdminUpgradeabilityProxy(admin) {
        // Intentionally left blank
      }
    
      /// @inheritdoc BaseImmutableAdminUpgradeabilityProxy
      function _willFallback() internal override(BaseImmutableAdminUpgradeabilityProxy, Proxy) {
        BaseImmutableAdminUpgradeabilityProxy._willFallback();
      }
    }

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