Decode TxData (Singular & Multi)

[bh2smith]

User description

This is a front end helper function that transforms UserOperation into something a bit more human readable.

Test Plan

See added unit tests

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PR Type

Enhancement, Tests

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Description

• Added isMultisendTx function in src/lib/multisend.ts to identify multisend transactions.
• Implemented decodeTxData method in NearSafe class to decode transaction data and determine transaction type.
• Updated types in src/types.ts to include EvmTransactionData and modified EncodedTxData to use it.
• Added unit tests for decodeTxData method in NearSafe class.
• Added ethers-multisend dependency in package.json.

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Changes walkthrough 📝

	Relevant files
Enhancement	multisend.ts Add function to identify multisend transactions                    src/lib/multisend.ts Added isMultisendTx function to check if a transaction is a multisend transaction. +8/-0      near-safe.ts Add and integrate transaction data decoding functionality src/near-safe.ts Imported decodeMulti and decodeFunctionData from dependencies. Added decodeTxData method to decode transaction data. Utilized isMultisendTx to determine transaction type. +44/-2    types.ts Update types for EVM transaction data                                        src/types.ts Added EvmTransactionData interface. Updated EncodedTxData to use EvmTransactionData. +9/-6
Tests	nearsafe.spec.ts Add unit test for transaction data decoding                            tests/unit/nearsafe.spec.ts Added unit test for decodeTxData method in NearSafe class. +42/-0
Dependencies	package.json Add ethers-multisend dependency                                                    package.json Added ethers-multisend dependency. +1/-0

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PR Reviewer Guide 🔍

⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ Key issues to review Error Handling The method decodeTxData in NearSafe class assumes data.data can always be parsed to UserOperation. This might not always be the case, and it could lead to runtime errors if the parsing fails. Consider adding error handling for cases where data.data does not conform to the expected format. Hardcoded Values The method decodeTxData uses hardcoded values to determine if a transaction is a multisend transaction (isMultisendTx(args)). This could limit flexibility and maintainability. Consider externalizing these values or providing a mechanism to configure them.

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PR Code Suggestions ✨

Category	Suggestion	Score
Possible bug	Add a type guard to ensure safe casting of args[0] to string Consider adding a type guard to ensure that args[0] can be safely cast to string. This will prevent runtime errors if args[0] is not a string. src/lib/multisend.ts [63] -const to = (args[0] as string).toLowerCase(); +if (typeof args[0] !== 'string') throw new TypeError('Expected string for args[0]'); +const to = args[0].toLowerCase(); Suggestion importance[1-10]: 10 Why: Adding a type guard to ensure args[0] is a string before casting prevents potential runtime errors, which is crucial for robust code.	10
	Add error handling for JSON parsing to prevent runtime exceptions Handle potential exceptions when parsing data.data with JSON.parse to avoid runtime errors if data.data is not a valid JSON string. src/near-safe.ts [261] -const userOp: UserOperation = JSON.parse(data.data); +let userOp: UserOperation; +try { + userOp = JSON.parse(data.data); +} catch (error) { + throw new Error('Failed to parse data.data as JSON'); +} Suggestion importance[1-10]: 10 Why: Handling potential exceptions when parsing JSON is essential to avoid runtime errors, making the code more reliable and robust.	10
Possible issue	Validate the structure of userOp to ensure all required fields are present Consider validating the structure of userOp after parsing to ensure it contains all required fields before accessing them. src/near-safe.ts [262] +const requiredFields = ['callGasLimit', 'maxFeePerGas', 'maxPriorityFeePerGas']; +for (const field of requiredFields) { + if (!(field in userOp)) { + throw new Error(\`Missing required field \${field}\`); + } +} const { callGasLimit, maxFeePerGas, maxPriorityFeePerGas } = userOp; Suggestion importance[1-10]: 9 Why: Validating the structure of userOp ensures that all required fields are present before accessing them, preventing potential runtime errors and improving code reliability.	9
Enhancement	Ensure accurate arithmetic operations with large numbers using BigInt Use BigInt for arithmetic operations on callGasLimit and maxGasPrice to ensure accurate calculations with large numbers. src/near-safe.ts [283] -costEstimate: formatEther(BigInt(callGasLimit) * maxGasPrice), +costEstimate: formatEther(BigInt(callGasLimit) * BigInt(maxGasPrice)), Suggestion importance[1-10]: 8 Why: Using BigInt for all arithmetic operations involving large numbers ensures accuracy, which is important for financial calculations.	8