{ "contractName": "FIFSBurnableRegistrar", "abi": [ { "constant": true, "inputs": [], "name": "burningToken", "outputs": [ { "name": "", "type": "address" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "owner", "outputs": [ { "name": "", "type": "address" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "registrationCost", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "newOwner", "type": "address" } ], "name": "transferOwnership", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "rootNode", "outputs": [ { "name": "", "type": "bytes32" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "inputs": [ { "name": "_ensAddr", "type": "address" }, { "name": "_resolver", "type": "address" }, { "name": "_node", "type": "bytes32" }, { "name": "_burningToken", "type": "address" }, { "name": "_startingCost", "type": "uint256" } ], "payable": false, "stateMutability": "nonpayable", "type": "constructor" }, { "anonymous": false, "inputs": [ { "indexed": true, "name": "subnode", "type": "bytes32" }, { "indexed": true, "name": "owner", "type": "address" }, { "indexed": true, "name": "resolver", "type": "address" } ], "name": "ClaimSubdomain", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "name": "previousOwner", "type": "address" }, { "indexed": true, "name": "newOwner", "type": "address" } ], "name": "OwnershipTransferred", "type": "event" }, { "constant": false, "inputs": [ { "name": "_from", "type": "address" }, { "name": "_amount", "type": "uint256" }, { "name": "_token", "type": "address" }, { "name": "_data", "type": "bytes" } ], "name": "receiveApproval", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "_subnode", "type": "bytes32" }, { "name": "_owner", "type": "address" } ], "name": "register", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "_burningToken", "type": "address" } ], "name": "setBurningToken", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "_cost", "type": "uint256" } ], "name": "setRegistrationCost", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "_subnode", "type": "bytes32" }, { "name": "_owner", "type": "address" }, { "name": "_resolver", "type": "address" } ], "name": "registerWithResolver", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" } ], "bytecode": 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"source": "pragma solidity 0.4.24;\n\nimport \"./interface/ApproveAndCallReceiver.sol\";\nimport \"./zeppelin/ERC20.sol\";\nimport \"./zeppelin/Ownable.sol\";\nimport \"./FIFSResolvingRegistrar.sol\";\n\n\n/**\n * A registrar that allocates subdomains to the first person who claims them by burning the required\n * amount of tokens.\n\n * Note: requires the token to support the `approveAndCall()` interface.\n */\ncontract FIFSBurnableRegistrar is Ownable, ApproveAndCallReceiver, FIFSResolvingRegistrar {\n ERC20 public burningToken;\n uint256 public registrationCost;\n\n address private constant BURN_ADDRESS = 0xdead;\n\n /**\n * Constructor.\n * @param _ensAddr The address of the ENS registry.\n * @param _resolver The address of the default resolver to use for subdomains.\n * @param _node The node that this registrar administers.\n * @param _burningToken The token to be burned for claiming addresses.\n * @param _startingCost The initial cost of claiming an address.\n */\n constructor(\n AbstractENS _ensAddr,\n IPublicResolver _resolver,\n bytes32 _node,\n ERC20 _burningToken,\n uint256 _startingCost\n ) public Ownable FIFSResolvingRegistrar(_ensAddr, _resolver, _node) {\n burningToken = _burningToken;\n registrationCost = _startingCost;\n }\n\n /**\n * `approveAndCall()` callback.\n * Expects to register a subdomain via an external call to `register()` or\n * `registerWithResolver()` if the `_amount` is greater than or equal to `registrationCost`.\n * Burns `registrationCost` number of tokens from the sender.\n * @param _from The address of the claimer.\n * @param _amount The amount of tokens approved by the claimer.\n * @param _token The address of the token (unused).\n * @param _data An encoded call to `registerWithResolver()`.\n */\n // solhint-disable-next-line no-unused-vars\n function receiveApproval(address _from, uint256 _amount, address _token, bytes _data) external {\n require(msg.sender == address(burningToken));\n\n // Make the external call and if successful, burn the tokens\n // solhint-disable-next-line avoid-low-level-calls\n require(this.call(_data));\n }\n\n /**\n * Register a subdomain with the default resolver if it hasn't been claimed yet.\n * Overwrites `FIFSResolvingRegistrar.register()`, to avoid polymorphism.\n * @param _subnode The hash of the label to register.\n * @param _owner The address of the new owner.\n */\n function register(bytes32 _subnode, address _owner) external {\n FIFSBurnableRegistrar.registerWithResolver(_subnode, _owner, defaultResolver);\n }\n\n /**\n * Set the token to be burnt.\n * @param _burningToken The token to be burnt.\n */\n function setBurningToken(ERC20 _burningToken) external onlyOwner {\n burningToken = _burningToken;\n }\n\n /**\n * Set registration cost (in tokens) for claiming a subdomain.\n * @param _cost The cost (in tokens).\n */\n function setRegistrationCost(uint256 _cost) external onlyOwner {\n registrationCost = _cost;\n }\n\n /**\n * Register a subdomain if it hasn't been claimed yet.\n * Requires the _owner to have approved at least the amount of the requiredCost to this\n * contract for the burningToken.\n * @param _subnode The hash of the label to register.\n * @param _owner The address of the new owner.\n * @param _resolver The address of the resolver.\n */\n function registerWithResolver(bytes32 _subnode, address _owner, IPublicResolver _resolver) public {\n FIFSResolvingRegistrar.registerWithResolver(_subnode, _owner, _resolver);\n\n // Burn tokens\n if (registrationCost > 0) {\n require(burningToken.transferFrom(_owner, BURN_ADDRESS, registrationCost));\n }\n }\n}\n", "sourcePath": "/Users/brett/Development/aragon/aragon-id/contracts/FIFSBurnableRegistrar.sol", "ast": { "absolutePath": "/Users/brett/Development/aragon/aragon-id/contracts/FIFSBurnableRegistrar.sol", "exportedSymbols": { "FIFSBurnableRegistrar": [ 417 ] }, "id": 418, "nodeType": "SourceUnit", "nodes": [ { "id": 270, "literals": [ "solidity", "0.4", ".24" ], "nodeType": 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274, "nodeType": "ImportDirective", "scope": 418, "sourceUnit": 556, "src": "138:38:2", "symbolAliases": [], "unitAlias": "" }, { "baseContracts": [ { "arguments": null, "baseName": { "contractScope": null, "id": 275, "name": "Ownable", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 3327, "src": "417:7:2", "typeDescriptions": { "typeIdentifier": "t_contract$_Ownable_$3327", "typeString": "contract Ownable" } }, "id": 276, "nodeType": "InheritanceSpecifier", "src": "417:7:2" }, { "arguments": null, "baseName": { "contractScope": null, "id": 277, "name": "ApproveAndCallReceiver", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 627, "src": "426:22:2", "typeDescriptions": { "typeIdentifier": "t_contract$_ApproveAndCallReceiver_$627", "typeString": "contract ApproveAndCallReceiver" } }, "id": 278, "nodeType": "InheritanceSpecifier", "src": "426:22:2" }, { "arguments": null, "baseName": { "contractScope": null, "id": 279, "name": "FIFSResolvingRegistrar", "nodeType": 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"typeIdentifier": "t_rational_0_by_1", "typeString": "int_const 0" }, "value": "0" }, "src": "3698:20:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } }, "falseBody": null, "id": 414, "nodeType": "IfStatement", "src": "3694:125:2", "trueBody": { "id": 413, "nodeType": "Block", "src": "3720:99:2", "statements": [ { "expression": { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "arguments": [ { "argumentTypes": null, "id": 407, "name": "_owner", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 388, "src": "3768:6:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 408, "name": "BURN_ADDRESS", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 287, "src": "3776:12:2", "typeDescriptions": { "typeIdentifier": "t_address", "typeString": "address" } }, { "argumentTypes": null, "id": 409, "name": "registrationCost", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 284, "src": "3790:16:2", "typeDescriptions": { "typeIdentifier": "t_uint256", "typeString": "uint256" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_address", "typeString": "address" }, { "typeIdentifier": "t_uint256", "typeString": "uint256" } ], "expression": { "argumentTypes": null, "id": 405, "name": "burningToken", "nodeType": "Identifier", "overloadedDeclarations": [], "referencedDeclaration": 282, "src": "3742:12:2", "typeDescriptions": { "typeIdentifier": "t_contract$_ERC20_$3242", "typeString": "contract ERC20" } }, "id": 406, "isConstant": false, "isLValue": false, "isPure": false, "lValueRequested": false, "memberName": "transferFrom", "nodeType": "MemberAccess", "referencedDeclaration": 3224, "src": "3742:25:2", "typeDescriptions": { "typeIdentifier": "t_function_external_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$_t_bool_$", "typeString": "function (address,address,uint256) external returns (bool)" } }, "id": 410, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3742:65:2", "typeDescriptions": { "typeIdentifier": "t_bool", "typeString": "bool" } } ], "expression": { "argumentTypes": [ { "typeIdentifier": "t_bool", "typeString": "bool" } ], "id": 404, "name": "require", "nodeType": "Identifier", "overloadedDeclarations": [ 3425, 3426 ], "referencedDeclaration": 3425, "src": "3734:7:2", "typeDescriptions": { "typeIdentifier": "t_function_require_pure$_t_bool_$returns$__$", "typeString": "function (bool) pure" } }, "id": 411, "isConstant": false, "isLValue": false, "isPure": false, "kind": "functionCall", "lValueRequested": false, "names": [], "nodeType": "FunctionCall", "src": "3734:74:2", "typeDescriptions": { "typeIdentifier": "t_tuple$__$", "typeString": "tuple()" } }, "id": 412, "nodeType": "ExpressionStatement", "src": "3734:74:2" } ] } } ] }, "documentation": "Register a subdomain if it hasn't been claimed yet.\nRequires the _owner to have approved at least the amount of the requiredCost to this\ncontract for the burningToken.\n@param _subnode The hash of the label to register.\n@param _owner The address of the new owner.\n@param _resolver The address of the resolver.", "id": 416, "implemented": true, "isConstructor": false, "isDeclaredConst": false, "modifiers": [], "name": "registerWithResolver", "nodeType": "FunctionDefinition", "parameters": { "id": 391, "nodeType": "ParameterList", "parameters": [ { "constant": false, "id": 386, "name": "_subnode", "nodeType": "VariableDeclaration", "scope": 416, "src": "3510:16:2", "stateVariable": false, "storageLocation": "default", "typeDescriptions": { "typeIdentifier": "t_bytes32", "typeString": "bytes32" }, "typeName": { "id": 385, "name": 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"id": 389, "name": "IPublicResolver", "nodeType": "UserDefinedTypeName", "referencedDeclaration": 613, "src": "3544:15:2", "typeDescriptions": { "typeIdentifier": "t_contract$_IPublicResolver_$613", "typeString": "contract IPublicResolver" } }, "value": null, "visibility": "internal" } ], "src": "3509:61:2" }, "payable": false, "returnParameters": { "id": 392, "nodeType": "ParameterList", "parameters": [], "src": "3578:0:2" }, "scope": 417, "src": "3480:345:2", "stateMutability": "nonpayable", "superFunction": 554, "visibility": "public" } ], "scope": 418, "src": "383:3444:2" } ], "src": "0:3828:2" }, "compiler": { "name": "solc", "version": "0.4.24+commit.e67f0147.Emscripten.clang" }, "networks": {}, "schemaVersion": "2.0.1", "updatedAt": "2020-01-30T18:28:02.810Z" }