Writing a Resolver
Every ENS name has a resolver, which is responsible for resolving information about a name. By writing your own resolver contract you can extend the functionality of your name, subnames, and more.
Resolvers are a core part of the ENS protocolm, they give the power to a name "node" to control the resolution process from itself onwards (its subdomains etc). Resolvers were originally standardized in EIP 137, but have since received a few updates such as EIP 181, EIP 2304, and ENSIP-10.
the idea of a resolver is pretty straight forward. "any contract that implements the resolver interface". There have been a few extensions to the original interface, however a summarized interface is defined as follows:
contract MyResolver {
fn addr(bytes32 node) public view returns (address);
}
In ENSIP-10 a new method was added to the resolver interface, the resolve() method.
This method allows for fetching
interface ExtendedResolver {
function resolve(bytes calldata name, bytes calldata data) external view returns(bytes);
}
Don't forget to add 0x9061b923 to your EIP-165 supportsInterface() implementation.
When you write your own resolver you are able to leverage the power of CCIP Read. More about writing a ccip-enabled resolver here