Borrower Gateway

BorrowerGateway: Interface for borrowers to interact with lender vaults. Manages borrowing, repayment, collateral and loan token transfers

Summary:

BorrowerGateway.sol is a contract that serves as an interface between borrowers and lender vaults in the Peer-to-Peer DeFi framework. It handles the borrowing and repayment processes, including transfers of collateral and loan tokens.

Key Features:

• Allows borrowers to borrow funds using on-chain and off-chain quotes.

• Facilitates collateral and loan token transfers between borrowers and lender vaults.

• Manages protocol fees charged during borrowing.

• Supports loan repayments and updates the lender vault's storage state.

Key Functions:

• constructor(address _addressRegistry): Initializes the BorrowerGateway contract with the address of the AddressRegistry contract.

• borrowWithOffChainQuote(): Borrows funds using an off-chain quote and initiates the necessary transfers.

• borrowWithOnChainQuote(): Borrows funds using an on-chain quote and initiates the necessary transfers.

• repay(): Repays a loan and updates the lender vault's storage state.

• setProtocolFee(): Sets the protocol fee for borrowing transactions.

• processTransfers(): Processes collateral and loan token transfers during borrowing.

• processRepayTransfers(): Processes collateral and loan token transfers during loan repayment.

• checkDeadlineAndRegisteredVault(): Checks the deadline and verifies the existence of a registered lender vault.

Libraries:

• ReentrancyGuard: The contract imports the ReentrancyGuard library from the OpenZeppelin library to prevent reentrancy attacks.

• SafeERC20: The contract imports the SafeERC20 library from the OpenZeppelin library to safely perform ERC20 token transfers.

Interfaces:

• IAddressRegistry: The contract imports the IAddressRegistry interface to interact with the AddressRegistry contract.

• IBorrowerGateway: The contract imports the IBorrowerGateway interface to define the functions required for the BorrowerGateway contract.

• ILenderVaultImpl: The contract imports the ILenderVaultImpl interface to access the loan and vault information in the lender vault.

• IVaultCallback: The contract imports the IVaultCallback interface to interact with callback contracts for additional processing.

Dependencies:

• Constants: The contract imports the Constants contract to access predefined constants used in calculations.

• DataTypesPeerToPeer: The contract imports the DataTypesPeerToPeer contract to access the data structures used for borrowing and repayment instructions.

• Errors: The contract imports the Errors library, which provides custom error messages for different exceptional scenarios.

• IERC20Metadata: The contract imports the IERC20Metadata interface from the OpenZeppelin library to interact with ERC20 tokens.