Enhancement of isValidSigner Function in IPAccount

[kingster-will]

Description

This PR includes changes that enhance the isValidSigner function inherited from the ERC6551 standard. The function now not only checks whether the signer is the owner of the IPAccount, but also queries and checks whether the signer is valid to execute a transaction on behalf of the IPAccount on a specific recipient address with specific calldata.

Changes:

Modified the isValidSigner function to allow the caller to encode the recipient address and calldata into the data parameter. This change enables the function to check or query whether a signer has valid permission to perform a specific action on behalf of the IPAccount before really executing the action.

Test Plan

Updated the unit tests to reflect these changes.
100% unit test coverage of changed code.

Summary by CodeRabbit

• New Features

  • Improved signer validation with enhanced data encoding and additional checks for better security in transactions.

• Tests

  • Added new test cases to verify the validity of signers, ensuring proper handling of various input scenarios and validation processes.

[Ramarti]

LGTM + Approved by auditors

[coderabbitai]

Walkthrough

The updates enhance the IPAccountImpl.sol contract by refining its signer validation method and testing framework. The isValidSigner function was overhauled for better security and clarity, now dealing with data encoding and extra validation steps. Public access and naming conventions were modified. Additionally, new tests were introduced in IPAccountTest to ensure robust evaluation of the isValidSigner function.

Changes

Files	Change Summary
.../IPAccountImpl.sol	Updated the isValidSigner function for improved data encoding and additional checks. Renamed _isValidSigner to isValidSigner and made it public.
.../IPAccountImpl.sol	Introduced function isValidSigner(address signer, address to, bytes calldata data) public view returns (bool).
.../test/foundry/IPAccount.t.sol	Added test_IPAccount_isValidSigner() for testing isValidSigner with various inputs and permission checks.
.../test/foundry/IPAccount.t.sol	Added test_IPAccount_isValidSigner_revert_InvalidInputs() for validating isValidSigner with invalid inputs.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant IPAccount
    participant ERC6551
    participant IIPAccount

    User->>IPAccount: call isValidSigner(address, data)
    IPAccount->>ERC6551: validate signer
    ERC6551-->>IPAccount: validation result
    IPAccount->>IIPAccount: notify on validation
    IIPAccount-->>IPAccount: acknowledgment 

    User->>IPAccount: validation result

Loading

Poem

In fields where code and bunnies meet,
The signer's checks now stand complete.
With data tight and tests in place,
The IPAccount runs its race.
Through bytes and strings, with nimble feet,
Our code hops forward, secure and neat.
🌸✨

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[coderabbitai]

Actionable comments posted: 1

Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between b2b1e82 and d7fdb98.

Files selected for processing (2)

• contracts/IPAccountImpl.sol (4 hunks)
• test/foundry/IPAccount.t.sol (1 hunks)

Additional comments not posted (2)

contracts/IPAccountImpl.sol (1)

Line range hint 99-105: Security Review of isValidSigner Overload Function

The function correctly handles edge cases for the data length and performs permission checks using the AccessController. This robust handling ensures that only valid signers can execute actions, which is crucial for the security of the protocol.

Consider adding detailed comments explaining the significance of the selector extraction and its role in permission checks, as this could enhance the maintainability and clarity of the code.

+ // Extract the first 4 bytes of data as the function selector for permission checks
  if (data.length >= 4) {
      selector = bytes4(data[:4]);
  }

test/foundry/IPAccount.t.sol (1)

119-146: Review of New Test Functions for isValidSigner

The new test functions test_IPAccount_isValidSigner and test_IPAccount_isValidSigner_revert_InvalidInputs are crucial for ensuring that the enhanced isValidSigner functionality behaves as expected under various conditions. These tests cover scenarios including owner validation, data encoding, and permission checks.

It's essential to ensure that these tests cover all edge cases, especially for the new data encoding functionality. Consider adding more tests if any scenarios are not yet covered.