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55 lines
2.4 KiB
Solidity
55 lines
2.4 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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import "./UUPSUpgradeableMock.sol";
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// This contract implements the pre-4.5 UUPS upgrade function with a rollback test.
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// It's used to test that newer UUPS contracts are considered valid upgrades by older UUPS contracts.
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contract UUPSUpgradeableLegacyMock is UUPSUpgradeableMock {
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// Inlined from ERC1967Upgrade
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bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;
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// ERC1967Upgrade._setImplementation is private so we reproduce it here.
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// An extra underscore prevents a name clash error.
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function __setImplementation(address newImplementation) private {
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require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
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StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
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}
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function _upgradeToAndCallSecureLegacyV1(address newImplementation, bytes memory data, bool forceCall) internal {
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address oldImplementation = _getImplementation();
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// Initial upgrade and setup call
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__setImplementation(newImplementation);
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if (data.length > 0 || forceCall) {
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Address.functionDelegateCall(newImplementation, data);
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}
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// Perform rollback test if not already in progress
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StorageSlot.BooleanSlot storage rollbackTesting = StorageSlot.getBooleanSlot(_ROLLBACK_SLOT);
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if (!rollbackTesting.value) {
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// Trigger rollback using upgradeTo from the new implementation
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rollbackTesting.value = true;
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Address.functionDelegateCall(
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newImplementation,
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abi.encodeWithSignature("upgradeTo(address)", oldImplementation)
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);
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rollbackTesting.value = false;
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// Check rollback was effective
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require(oldImplementation == _getImplementation(), "ERC1967Upgrade: upgrade breaks further upgrades");
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// Finally reset to the new implementation and log the upgrade
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_upgradeTo(newImplementation);
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}
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}
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// hooking into the old mechanism
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function upgradeTo(address newImplementation) external override {
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_upgradeToAndCallSecureLegacyV1(newImplementation, bytes(""), false);
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}
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function upgradeToAndCall(address newImplementation, bytes memory data) external payable override {
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_upgradeToAndCallSecureLegacyV1(newImplementation, data, false);
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}
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}
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