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contracts/ens: Add ENS contract binding

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This commit is contained in:
Nick Johnson
2016-08-26 13:00:25 +01:00
parent 5fc032a9d1
commit 6976e602f6
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contracts/ens/contract/ens.sol Normal file
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// Ethereum Name Service contracts by Nick Johnson <nick@ethereum.org>
//
// To the extent possible under law, the person who associated CC0 with
// ENS contracts has waived all copyright and related or neighboring rights
// to ENS.
//
// You should have received a copy of the CC0 legalcode along with this
// work. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
/**
* The ENS registry contract.
*/
contract ENS {
struct Record {
address owner;
address resolver;
}
mapping(bytes32=>Record) records;
// Logged when the owner of a node assigns a new owner to a subnode.
event NewOwner(bytes32 indexed node, bytes32 indexed label, address owner);
// Logged when the owner of a node transfers ownership to a new account.
event Transfer(bytes32 indexed node, address owner);
// Logged when the owner of a node changes the resolver for that node.
event NewResolver(bytes32 indexed node, address resolver);
// Permits modifications only by the owner of the specified node.
modifier only_owner(bytes32 node) {
if(records[node].owner != msg.sender) throw;
_
}
/**
* Constructs a new ENS registrar, with the provided address as the owner of the root node.
*/
function ENS(address owner) {
records[0].owner = owner;
}
/**
* Returns the address that owns the specified node.
*/
function owner(bytes32 node) constant returns (address) {
return records[node].owner;
}
/**
* Returns the address of the resolver for the specified node.
*/
function resolver(bytes32 node) constant returns (address) {
return records[node].resolver;
}
/**
* Transfers ownership of a node to a new address. May only be called by the current
* owner of the node.
* @param node The node to transfer ownership of.
* @param owner The address of the new owner.
*/
function setOwner(bytes32 node, address owner) only_owner(node) {
Transfer(node, owner);
records[node].owner = owner;
}
/**
* Transfers ownership of a subnode sha3(node, label) to a new address. May only be
* called by the owner of the parent node.
* @param node The parent node.
* @param label The hash of the label specifying the subnode.
* @param owner The address of the new owner.
*/
function setOwner(bytes32 node, bytes32 label, address owner) only_owner(node) {
var subnode = sha3(node, label);
NewOwner(node, label, owner);
records[subnode].owner = owner;
}
/**
* Sets the resolver address for the specified node.
* @param node The node to update.
* @param resolver The address of the resolver.
*/
function setResolver(bytes32 node, address resolver) only_owner(node) {
NewResolver(node, resolver);
records[node].resolver = resolver;
}
}
/**
* A registrar that allocates subdomains to the first person to claim them. It also deploys
* a simple resolver contract and sets that as the default resolver on new names for
* convenience.
*/
contract FIFSRegistrar {
ENS ens;
PublicResolver defaultResolver;
bytes32 rootNode;
/**
* Constructor.
* @param ensAddr The address of the ENS registry.
* @param node The node that this registrar administers.
*/
function FIFSRegistrar(address ensAddr, bytes32 node) {
ens = ENS(ensAddr);
defaultResolver = new PublicResolver(ensAddr);
rootNode = node;
}
/**
* Register a name, or change the owner of an existing registration.
* @param subnode The hash of the label to register.
* @param owner The address of the new owner.
*/
function register(bytes32 subnode, address owner) {
var node = sha3(rootNode, subnode);
var currentOwner = ens.owner(node);
if(currentOwner != 0 && currentOwner != msg.sender)
throw;
// Temporarily set ourselves as the owner
ens.setOwner(rootNode, subnode, this);
// Set up the default resolver
ens.setResolver(node, defaultResolver);
// Set the owner to the real owner
ens.setOwner(node, owner);
}
}
contract Resolver {
event AddrChanged(bytes32 indexed node, address a);
event ContentChanged(bytes32 indexed node, bytes32 hash);
function has(bytes32 node, bytes32 kind) returns (bool);
function addr(bytes32 node) constant returns (address ret);
function content(bytes32 node) constant returns (bytes32 ret);
}
/**
* A simple resolver anyone can use; only allows the owner of a node to set its
* address.
*/
contract PublicResolver is Resolver {
ENS ens;
mapping(bytes32=>address) addresses;
mapping(bytes32=>bytes32) contents;
modifier only_owner(bytes32 node) {
if(ens.owner(node) != msg.sender) throw;
_
}
/**
* Constructor.
* @param ensAddr The ENS registrar contract.
*/
function PublicResolver(address ensAddr) {
ens = ENS(ensAddr);
}
/**
* Fallback function.
*/
function() {
throw;
}
/**
* Returns true if the specified node has the specified record type.
* @param node The ENS node to query.
* @param kind The record type name, as specified in EIP137.
* @return True if this resolver has a record of the provided type on the
* provided node.
*/
function has(bytes32 node, bytes32 kind) returns (bool) {
return (kind == "addr" && addresses[node] != 0) ||
(kind == "content" && contents[node] != 0);
}
/**
* Returns the address associated with an ENS node.
* @param node The ENS node to query.
* @return The associated address.
*/
function addr(bytes32 node) constant returns (address ret) {
ret = addresses[node];
if(ret == 0)
throw;
}
/**
* Returns the content hash associated with an ENS node.
* @param node The ENS node to query.
* @return The associated content hash.
*/
function content(bytes32 node) constant returns (bytes32 ret) {
ret = contents[node];
if(ret == 0)
throw;
}
/**
* Sets the address associated with an ENS node.
* May only be called by the owner of that node in the ENS registry.
* @param node The node to update.
* @param addr The address to set.
*/
function setAddr(bytes32 node, address addr) only_owner(node) {
addresses[node] = addr;
AddrChanged(node, addr);
}
/**
* Sets the content hash associated with an ENS node.
* May only be called by the owner of that node in the ENS registry.
* @param node The node to update.
* @param hash The content hash to set.
*/
function setContent(bytes32 node, bytes32 hash) only_owner(node) {
contents[node] = hash;
ContentChanged(node, hash);
}
}