feat: Add ERC20 approve transaction helper#343
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Add a generic ERC20 approve constructor in the contract transaction layer and expose a matching SafeSmartAccount transaction_erc20_approve API. This lets native clients submit a standard token approve(spender, amount) call through the existing 4337 transaction pipeline. World Card onboarding needs this to grant Permit2 spending approval before submitting the separate Permit2 allowance for the funding contract.
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aurel-fr
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This is not an API we want to expose. We can add a custom function to grant allowance to the PERMIT2 contract if needed.
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Why
World Card onboarding needs to grant Permit2 spending approval before submitting the separate Permit2 allowance call to the funding contract. The existing helpers cover transfers (
transaction_transfer) and Permit2-side approvals (transaction_permit2_approve), but there was no path for a plain ERC-20approve— which is the prerequisite for any Permit2-based flow.What
Erc20Approvetype inbedrock/src/transactions/contracts/erc20.rsthat encodesIERC20.approve(spender, value)as a 4337UserOperationvia the existingIs4337Encodabletrait.TransactionTypeId::Erc20Approve = 141nonce type so approvals are distinguishable from transfers in on-chain analytics.SafeSmartAccount::transaction_erc20_approve(token_address, spender_address, amount)as a high-level API for native clients.Test
erc20.rscovering the approve call data encoding (test_erc20_approve_call_data) and nonce layout (test_erc20_approve_preflight_nonce_type_id).bedrock/tests/test_smart_account_erc20_approve.rsthat spins up Anvil, deploys a Safe with the 4337 module, funds the EntryPoint, executestransaction_erc20_approveend-to-end, and asserts the on-chainallowance(safe, spender)matches the requested amount.