Protocol ERC721 Token Minimal Implementation

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Purpose

The IProtocolToken interface contains the minimal set of functions that must be implemented in order for an ERC721 token to be compatible with the protocol.

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Function Overview

The following functions have been defined in the IProtocolToken interface and must be implemented:

• connectHandlerToToken: Used to connect a deployed Protocol Token Handler to the token.

function connectHandlerToToken(address _handlerAddress) external appAdministratorOnly(appManagerAddress)

• getHandlerAddress: used to retrieve the address of the Protocol Token Handler.

function getHandlerAddress() external view override returns (address)

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checkAllRules Hook

The token must also override the _beforeTokenTransfer function and add a call to the checkAllRules hook defined in the IProtocolTokenHandler interface (using the handler address set in the above functions). Example:

    function _beforeTokenTransfer(address from, address to, uint256 amount) internal override {
        /// Rule Processor Module Check
        require(IProtocolTokenHandler(address(handler)).checkAllRules(balanceOf(from), balanceOf(to), from, to, _msgSender(), amount));
        super._beforeTokenTransfer(from, to, amount);
    }

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ERC165

The protocol relies on ERC721 tokens inheriting ERC165 interface standard. If your token does not inherit ERC165 rules that rely on pricing may not function as intended.