Yield Utils

This repo contains minimal or updated versions of popular smart contracts used as utilities.

Access

• AccessControl: Hierarchical access control with function signatures as roles
• Ownable: Contract access control to one address

Cast

Safely cast between types.

• Cast+Origin+Destination

Math

Fixed point math with 18 decimals. Multiplication and division, rounded down as default, also rounded up as option.

Token

• ERC20: Minimal ERC20 token inspired on DSToken
• ERC20Permit: ERC20 with ERC25612 off-chain signature support
• ERC20Rewards: ERC20Permit embedding rewards of another ERC20 using the Unipool pattern
• SafeERC20Namer: Derive ERC20 names safely regardless of underlying ERC20 implementation
• MinimalTransferHelper: transfer ERC20 tokens safely regardless of underlying ERC20 implementation
• TransferHelper: Same, but also transfer Ether and trasferFrom ERC20

Utils

• AddressStringUtil: Convert addresses to strings
• IsContract: Return if an address contains bytecode
• RevertMsgExtractor: Retrieve a revert message from a generic call return value
• Timelock: Schedule batched transactions to be executed after approval
• EmergencyBrake: Register AccessControl permissioning patterns to isolate contracts on emergencies
• Relay: Group transactions to be executed on a single external call

Audits

C4 audit - commit: 78693c5

Audit of Timelock.sol at 8ff8841 by Mudit Gupta: https://twitter.com/Mudit__Gupta/status/1429463910298525701?s=20

Audit of EmergencyBrake.sol 6e37565 by devtooligan: https://hackmd.io/@devtooligan/YieldEmergencyBrakeSecurityReview2022-10-11

License

All files in this repository are released under the MIT license.