OpenZeppelin/openzeppelin-contracts v5.6.0-rc.0

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Breaking changes

• ERC1155: Performing batch transfers with exactly one id/value in the batch no-longer calls IERC1155Receiver.onERC1155Received. IERC1155Receiver.onERC1155BatchReceived is called instead (with arrays of length one). (#6170)
• ERC1967Proxy and TransparentUpgradeableProxy: Mandate initialization during construction. Deployment now reverts with ERC1967ProxyUninitialized if an initialize call is not provided. Developers that rely on the previous behavior and want to disable this check can do so by overriding the internal _unsafeAllowUninitialized function to return true. (#5906)
• ERC721 and ERC1155: Prevent setting an operator for address(0). In the case of ERC721 this type of operator allowance could lead to obfuscated mint permission. (#6171)
• RLP: The encode(bytes32) function now encodes bytes32 as a fixed size item and not as a scalar in encode(uint256). Users must replace calls to encode(bytes32) with encode(uint256(bytes32)) to preserve the same behavior. (#6167)
• ERC4337Utils: The parseValidationData now returns a ValidationRange as the last return tuple value indicating whether the validationData is compared against a timestamp or block number. Developers must update their code to handle this new return value (e.g. (aggregator, validAfter, validUntil) -> (aggregator, validAfter, validUntil, range)). (#6215)

Changes by category

Account

• Account: Update default version of the ERC-4337 entrypoint to v0.9. (#6135)
• AccountERC7579: Do not revert and perform the uninstall if the onUninstall hook of a module reverts. (#6142)
• ERC4337Utils: Added the paymasterSignature function to extract the signature in paymasterAndData after Entrypoint v0.9. Similarly, a variant of paymasterData that receives a flag to exclude the signature from the returned data. (#6215)
• ERC4337Utils: Added variants of packValidationData(address,uint48,uint48) and packValidationData(bool,uint48,uint48) that receive a ValidationRange argument, could be timestamp or block number. Similarly, the parseValidationData now returns a ValidationRange too. (#6215)

Tokens

• ERC1155: Introduce the _checkAuthorized internal virtual function to encapsulate isApprovedForAll and msg.sender == from checks. (#6133)
• ERC1155: Call IERC1155Receiver.onERC1155BatchReceived when performing a batch transfers with exactly one id/value in the batch. (#6170)
• ERC4626: Allow overriding underlying assets transfer mechanisms through new internal virtual functions (_transferIn and _transferOut). (#5970)
• ERC721URIStorage: Add _suffixURI, an internal getter for retrieving the custom tokenURI without the base prefix. (#6175)

Cross-chain

• BridgeERC20Core, BridgeERC20 and BridgeERC7802: Added bridge contracts to handle crosschain movements of ERC-20 (and ERC-7802) tokens. (#5914)
• CrosschainLinked: Added a new helper contract to facilitate communication between a contract on one chain and counterparts on remote chains through ERC-7786 gateways. (#5914)
• ERC20Crosschain: Added an ERC-20 extension to embed an ERC-7786 based crosschain bridge directly in the token contract. (#5914)

Cryptography

• MessageHashUtils: Add helper functions to build EIP-712 domain typehash and separator with fields selectively enabled/disabled. (#5908)
• SignatureChecker: Add isValidERC1271SignatureNowCalldata, a variant of isValidERC1271SignatureNow that takes the signature from calldata. (#6123)
• TrieProof: Add library for verifying Ethereum Merkle-Patricia trie inclusion proofs. (#5826)

Structures

• DoubleEndedQueue: Add tryPushBack, tryPopBack, tryPushFront, tryPopFront, tryFront, tryBack, and tryAt function variants that do not revert. (#6020)
• EnumerableMap: Add support for Bytes4ToAddressMap types. (#6091)
• EnumerableSet: Add support for Bytes4Set type. (#6091)

Utils

• Arrays: Add replace functions enabling in-place array modification of address[], bytes32[] and uint256[] arrays, with new content from another array. (#5995)
• Arrays: Add slice and splice functions for value types (uint256[], bytes32[], address[]). (#5965)
• Bytes: Add replace functions that replaces a portion of a bytes buffer with content from another buffer. (#5995)
• Bytes: Add the toNibbles function that expands the nibbles (4 bits chunk) of a bytes buffer. Used for manipulating Patricia Merkle Trees keys and paths. (#5826)
• RLP: Encode bytes32 as a fixed size item and not as a scalar in encode(bytes32). Scalar RLP encoding remains available by casting to a uint256 and using the encode(uint256) function. (#6167)
• RLP: Fix RLP encoding validity check when decoding long lists or strings (#6051)