Quote Handler

QuoteHandler: Handles P2P DeFi quotes, validating addresses and whitelisting. Manages on-chain and off-chain quotes, signature verification, merkle proof, and interacts with AddressRegistry.

Summary:

QuoteHandler.sol is a contract that handles on-chain and off-chain quotes in the Peer-to-Peer DeFi framework. It interacts with the AddressRegistry contract to validate addresses and whitelist states.

Key Features:

• Adds, updates, and deletes on-chain quotes.

• Manages the nonce for off-chain quotes.

• Validates and registers on-chain and off-chain quotes.

• Verifies signatures and performs merkle proof verification.

Key Functions:

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

• addOnChainQuote(): Adds a new on-chain quote to a specific lender vault.

• updateOnChainQuote(): Updates an existing on-chain quote for a specific lender vault.

• deleteOnChainQuote(): Deletes an on-chain quote for a specific lender vault.

• incrementOffChainQuoteNonce(): Increments the nonce for off-chain quotes of a specific lender vault.

• invalidateOffChainQuote(): Invalidates an off-chain quote for a specific lender vault.

• checkAndRegisterOnChainQuote(): Checks and registers an on-chain quote for a borrower and lender vault.

• checkAndRegisterOffChainQuote(): Checks and registers an off-chain quote for a borrower and lender vault.

• areValidSignatures(): Verifies the signatures of an off-chain quote.

• hashOffChainQuote(): Calculates the hash of an off-chain quote.

• checkSenderAndGeneralQuoteInfo(): Checks the sender and general quote information for validity.

• isValidOnChainQuote(): Checks the validity of an on-chain quote.

• hashOnChainQuote(): Calculates the hash of an on-chain quote.

Libraries:

• MerkleProof: The contract imports the MerkleProof library from the OpenZeppelin library to perform merkle proof verification.

• ECDSA: The contract imports the ECDSA library from the OpenZeppelin library for ECDSA signature verification.

Interfaces:

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

• ILenderVaultImpl: The contract imports the ILenderVaultImpl interface to access the owner and signer information of a lender vault.

Dependencies:

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

• DataTypesPeerToPeer: The contract imports the DataTypesPeerToPeer contract to access the data structures used for quotes.

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