ReverseRegistrar
The registrar responsible for managing reverse resolution via the .addr.reverse special-purpose TLD.
Reverse resolution in ENS - the process of mapping from an Ethereum address (eg, 0x1234...) to an ENS name - is handled using a special namespace, .addr.reverse. A special-purpose registrar controls this namespace and allocates subdomains to any caller based on their address.
For example, the account 0x314159265dd8dbb310642f98f50c066173c1259b can claim 314159265dd8dbb310642f98f50c066173c1259b.addr.reverse. After doing so, it can configure a resolver and expose metadata, such as a canonical ENS name for this address.
The reverse registrar provides functions to claim a reverse record, as well as a convenience function to configure the record as it's most commonly used, as a way of specifying a canonical name for an address.
function claim(address owner) public returns (bytes32);
Claims the caller's address in the reverse registrar, assigning ownership of the reverse record to
owner. Equivalent to calling claimWithResolver(owner, 0).function claimWithResolver(address owner, address resolver) public returns (bytes32)
Claims the caller's address in the reverse registrar, assigning ownership of the reverse record to
owner. If resolver is nonzero, also updates the record's resolver.After calling this function:
- The reverse record for the caller (1234....addr.reverse) is owned by
owner. - If
resolveris nonzero, the reverse record for the caller has its resolver set toresolver; otherwise it is left unchanged.
function setName(string memory name) public returns (bytes32)
Configures the caller's reverse ENS record to point to the provided
name.This convenience function streamlines the process of setting up a reverse record for the common case where a user only wants to configure a reverse name and nothing else. It performs the following steps:
- 1.Sets the reverse record for the caller to be owned by the ReverseRegistrar.
- 2.Sets the reverse record for the caller to have
defaultResolveras its resolver. - 3.Sets the
name()field in thedefaultResolverfor the caller's reverse record toname.
In short, after calling this, a user has a fully configured reverse record claiming the provided
name as that account's canonical name.Users wanting more flexibility will need to use
claim or claimWithResolver and configure records manually on their chosen resolver contract.function node(address addr) public pure returns (bytes32)
Accepts an address, and returns the node (namehash output) for the address's reverse record. This function is provided as a convenience for contracts wishing to look up metadata for an address, and avoids the need for those contracts to handle the hex encoding and hashing necessary to derive the required value.
Resolver public defaultResolver;
Returns the address of the resolver contract that the
ReverseRegistrar uses for setName.