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    Contract Diff Checker

    Contract Name:
    InitializableImmutableAdminUpgradeabilityProxy

    Contract Source Code:

    // SPDX-License-Identifier: agpl-3.0
    pragma solidity 0.6.12;
    
    /**
     * @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) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly {
          codehash := extcodehash(account)
        }
        return (codehash != accountHash && codehash != 0x0);
      }
    
      /**
       * @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');
    
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{value: amount}('');
        require(success, 'Address: unable to send value, recipient may have reverted');
      }
    }

    // SPDX-License-Identifier: agpl-3.0
    pragma solidity 0.6.12;
    
    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 0.6.12;
    
    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 ^0.6.0;
    
    /**
     * @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.
       * 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 0.6.12;
    
    import '../../../dependencies/openzeppelin/upgradeability/BaseUpgradeabilityProxy.sol';
    
    /**
     * @title BaseImmutableAdminUpgradeabilityProxy
     * @author Aave, inspired by the OpenZeppelin upgradeability proxy pattern
     * @dev This contract combines an upgradeability proxy with an authorization
     * mechanism for administrative tasks. 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 immutable ADMIN;
    
      constructor(address admin) public {
        ADMIN = admin;
      }
    
      modifier ifAdmin() {
        if (msg.sender == ADMIN) {
          _;
        } else {
          _fallback();
        }
      }
    
      /**
       * @return The address of the proxy admin.
       */
      function admin() external ifAdmin returns (address) {
        return ADMIN;
      }
    
      /**
       * @return The address of the implementation.
       */
      function implementation() external ifAdmin returns (address) {
        return _implementation();
      }
    
      /**
       * @dev Upgrade the backing implementation of the proxy.
       * Only the admin can call this function.
       * @param newImplementation Address of the new implementation.
       */
      function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeTo(newImplementation);
      }
    
      /**
       * @dev Upgrade the backing implementation of the proxy and call a function
       * on the new implementation.
       * This is useful to initialize the proxied contract.
       * @param newImplementation 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);
      }
    
      /**
       * @dev 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 0.6.12;
    
    import './BaseImmutableAdminUpgradeabilityProxy.sol';
    import '../../../dependencies/openzeppelin/upgradeability/InitializableUpgradeabilityProxy.sol';
    
    /**
     * @title InitializableAdminUpgradeabilityProxy
     * @dev Extends BaseAdminUpgradeabilityProxy with an initializer function
     */
    contract InitializableImmutableAdminUpgradeabilityProxy is
      BaseImmutableAdminUpgradeabilityProxy,
      InitializableUpgradeabilityProxy
    {
      constructor(address admin) public BaseImmutableAdminUpgradeabilityProxy(admin) {}
    
      /**
       * @dev Only fall back when the sender is not the admin.
       */
      function _willFallback() internal override(BaseImmutableAdminUpgradeabilityProxy, Proxy) {
        BaseImmutableAdminUpgradeabilityProxy._willFallback();
      }
    }

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