The Universal Smart Wallet uses the MetaMask Delegation Framework to power the unique delegation, authorization and intent based features.
The framework includes 20+ enforcer smart contract modules for dictating transaction execution capabilities.
How these enforcers are utilized has a significant impact on the user experience and system architecture.
The Universal Delegation Classification system is a way to classify these enforcer combinations in a more product centric normenclature. The goal is to provide a shared language for describing product features, instead of technical implementations.
A CreditAuthorization enables asset transfer from an account with NO EXPLICIT outcomes.
Canonical Name: CreditAuthorization
Core Enforcers:
- ERC20AmountTransferEnforcer.sol
- NativeTokenTransferAmountEnforcer.sol
Recommended Enforcers:
- BlockNumberEnforcer.sol
- TimestampEnforcer.sol
Note
The credit authorization does not include an enforcement mechanism for "repayment" of credit, because those capabilities can happen indepdent of the enforcers: web of trust, decentralized protocol, centralized service, etc...
An ActionAuthorization enables asset transfer from an account with EXPLICIT outcomes.
Canonical Name: ActionAuthorization
Core Enforcers:
- ERC20BalanceGteEnforcer.sol
- NativeBalanceGteEnforcer.sol
Recommended Enforcers:
- AllowedCalldataEnforcer.sol
- AllowedMethodsEnforcer.sol
- AllowedTargetsEnforcer.sol
Optional Enforcers:
- BlockNumberEnforcer.sol
- LimitedCallsEnforcer.sol
- TimestampEnforcer.sol
- NonceEnforcer.sol
Because the Action Authorization can include calls to smart contract that might be unknown to Universal it's important that the applications attempt to use smart contract addresses, function signatures and calldata to make educated assumptions about what the user the user's intent.
How these inferences are made is implementation specific and may differ from application to application.