Source Code
Multichain Info
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| Register | 54649702 | 31 days ago | IN | 0 CELO | 0.00348968 | ||||
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| Register | 35268688 | 255 days ago | IN | 0 CELO | 0.00348488 |
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Contract Name:
SchemaRegistry
Compiler Version
v0.8.19+commit.7dd6d404
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;
import { ISchemaResolver } from "./resolver/ISchemaResolver.sol";
import { EMPTY_UID } from "./Common.sol";
import { Semver } from "./Semver.sol";
import { ISchemaRegistry, SchemaRecord } from "./ISchemaRegistry.sol";
/// @title SchemaRegistry
/// @notice The global schema registry.
contract SchemaRegistry is ISchemaRegistry, Semver {
error AlreadyExists();
// The global mapping between schema records and their IDs.
mapping(bytes32 uid => SchemaRecord schemaRecord) private _registry;
/// @dev Creates a new SchemaRegistry instance.
constructor() Semver(1, 3, 0) {}
/// @inheritdoc ISchemaRegistry
function register(string calldata schema, ISchemaResolver resolver, bool revocable) external returns (bytes32) {
SchemaRecord memory schemaRecord = SchemaRecord({
uid: EMPTY_UID,
schema: schema,
resolver: resolver,
revocable: revocable
});
bytes32 uid = _getUID(schemaRecord);
if (_registry[uid].uid != EMPTY_UID) {
revert AlreadyExists();
}
schemaRecord.uid = uid;
_registry[uid] = schemaRecord;
emit Registered(uid, msg.sender, schemaRecord);
return uid;
}
/// @inheritdoc ISchemaRegistry
function getSchema(bytes32 uid) external view returns (SchemaRecord memory) {
return _registry[uid];
}
/// @dev Calculates a UID for a given schema.
/// @param schemaRecord The input schema.
/// @return schema UID.
function _getUID(SchemaRecord memory schemaRecord) private pure returns (bytes32) {
return keccak256(abi.encodePacked(schemaRecord.schema, schemaRecord.resolver, schemaRecord.revocable));
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)
pragma solidity ^0.8.0;
import "./math/Math.sol";
import "./math/SignedMath.sol";
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _SYMBOLS = "0123456789abcdef";
uint8 private constant _ADDRESS_LENGTH = 20;
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
unchecked {
uint256 length = Math.log10(value) + 1;
string memory buffer = new string(length);
uint256 ptr;
/// @solidity memory-safe-assembly
assembly {
ptr := add(buffer, add(32, length))
}
while (true) {
ptr--;
/// @solidity memory-safe-assembly
assembly {
mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
}
value /= 10;
if (value == 0) break;
}
return buffer;
}
}
/**
* @dev Converts a `int256` to its ASCII `string` decimal representation.
*/
function toString(int256 value) internal pure returns (string memory) {
return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
unchecked {
return toHexString(value, Math.log256(value) + 1);
}
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
/**
* @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
*/
function toHexString(address addr) internal pure returns (string memory) {
return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
}
/**
* @dev Returns true if the two strings are equal.
*/
function equal(string memory a, string memory b) internal pure returns (bool) {
return keccak256(bytes(a)) == keccak256(bytes(b));
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)
pragma solidity ^0.8.0;
/**
* @dev Standard math utilities missing in the Solidity language.
*/
library Math {
enum Rounding {
Down, // Toward negative infinity
Up, // Toward infinity
Zero // Toward zero
}
/**
* @dev Returns the largest of two numbers.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256) {
return a > b ? a : b;
}
/**
* @dev Returns the smallest of two numbers.
*/
function min(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two numbers. The result is rounded towards
* zero.
*/
function average(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b) / 2 can overflow.
return (a & b) + (a ^ b) / 2;
}
/**
* @dev Returns the ceiling of the division of two numbers.
*
* This differs from standard division with `/` in that it rounds up instead
* of rounding down.
*/
function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b - 1) / b can overflow on addition, so we distribute.
return a == 0 ? 0 : (a - 1) / b + 1;
}
/**
* @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
* @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
* with further edits by Uniswap Labs also under MIT license.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
unchecked {
// 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
// use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
// variables such that product = prod1 * 2^256 + prod0.
uint256 prod0; // Least significant 256 bits of the product
uint256 prod1; // Most significant 256 bits of the product
assembly {
let mm := mulmod(x, y, not(0))
prod0 := mul(x, y)
prod1 := sub(sub(mm, prod0), lt(mm, prod0))
}
// Handle non-overflow cases, 256 by 256 division.
if (prod1 == 0) {
// Solidity will revert if denominator == 0, unlike the div opcode on its own.
// The surrounding unchecked block does not change this fact.
// See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
return prod0 / denominator;
}
// Make sure the result is less than 2^256. Also prevents denominator == 0.
require(denominator > prod1, "Math: mulDiv overflow");
///////////////////////////////////////////////
// 512 by 256 division.
///////////////////////////////////////////////
// Make division exact by subtracting the remainder from [prod1 prod0].
uint256 remainder;
assembly {
// Compute remainder using mulmod.
remainder := mulmod(x, y, denominator)
// Subtract 256 bit number from 512 bit number.
prod1 := sub(prod1, gt(remainder, prod0))
prod0 := sub(prod0, remainder)
}
// Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
// See https://cs.stackexchange.com/q/138556/92363.
// Does not overflow because the denominator cannot be zero at this stage in the function.
uint256 twos = denominator & (~denominator + 1);
assembly {
// Divide denominator by twos.
denominator := div(denominator, twos)
// Divide [prod1 prod0] by twos.
prod0 := div(prod0, twos)
// Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
twos := add(div(sub(0, twos), twos), 1)
}
// Shift in bits from prod1 into prod0.
prod0 |= prod1 * twos;
// Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
// that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
// four bits. That is, denominator * inv = 1 mod 2^4.
uint256 inverse = (3 * denominator) ^ 2;
// Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
// in modular arithmetic, doubling the correct bits in each step.
inverse *= 2 - denominator * inverse; // inverse mod 2^8
inverse *= 2 - denominator * inverse; // inverse mod 2^16
inverse *= 2 - denominator * inverse; // inverse mod 2^32
inverse *= 2 - denominator * inverse; // inverse mod 2^64
inverse *= 2 - denominator * inverse; // inverse mod 2^128
inverse *= 2 - denominator * inverse; // inverse mod 2^256
// Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
// This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
// less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
// is no longer required.
result = prod0 * inverse;
return result;
}
}
/**
* @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
uint256 result = mulDiv(x, y, denominator);
if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
result += 1;
}
return result;
}
/**
* @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
*
* Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
*/
function sqrt(uint256 a) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
// For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
//
// We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
// `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
//
// This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
// → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
// → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
//
// Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
uint256 result = 1 << (log2(a) >> 1);
// At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
// since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
// every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
// into the expected uint128 result.
unchecked {
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
return min(result, a / result);
}
}
/**
* @notice Calculates sqrt(a), following the selected rounding direction.
*/
function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = sqrt(a);
return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
}
}
/**
* @dev Return the log in base 2, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 128;
}
if (value >> 64 > 0) {
value >>= 64;
result += 64;
}
if (value >> 32 > 0) {
value >>= 32;
result += 32;
}
if (value >> 16 > 0) {
value >>= 16;
result += 16;
}
if (value >> 8 > 0) {
value >>= 8;
result += 8;
}
if (value >> 4 > 0) {
value >>= 4;
result += 4;
}
if (value >> 2 > 0) {
value >>= 2;
result += 2;
}
if (value >> 1 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 2, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log2(value);
return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 10, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >= 10 ** 64) {
value /= 10 ** 64;
result += 64;
}
if (value >= 10 ** 32) {
value /= 10 ** 32;
result += 32;
}
if (value >= 10 ** 16) {
value /= 10 ** 16;
result += 16;
}
if (value >= 10 ** 8) {
value /= 10 ** 8;
result += 8;
}
if (value >= 10 ** 4) {
value /= 10 ** 4;
result += 4;
}
if (value >= 10 ** 2) {
value /= 10 ** 2;
result += 2;
}
if (value >= 10 ** 1) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 10, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log10(value);
return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 256, rounded down, of a positive value.
* Returns 0 if given 0.
*
* Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
*/
function log256(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 16;
}
if (value >> 64 > 0) {
value >>= 64;
result += 8;
}
if (value >> 32 > 0) {
value >>= 32;
result += 4;
}
if (value >> 16 > 0) {
value >>= 16;
result += 2;
}
if (value >> 8 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 256, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log256(value);
return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
}
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)
pragma solidity ^0.8.0;
/**
* @dev Standard signed math utilities missing in the Solidity language.
*/
library SignedMath {
/**
* @dev Returns the largest of two signed numbers.
*/
function max(int256 a, int256 b) internal pure returns (int256) {
return a > b ? a : b;
}
/**
* @dev Returns the smallest of two signed numbers.
*/
function min(int256 a, int256 b) internal pure returns (int256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two signed numbers without overflow.
* The result is rounded towards zero.
*/
function average(int256 a, int256 b) internal pure returns (int256) {
// Formula from the book "Hacker's Delight"
int256 x = (a & b) + ((a ^ b) >> 1);
return x + (int256(uint256(x) >> 255) & (a ^ b));
}
/**
* @dev Returns the absolute unsigned value of a signed value.
*/
function abs(int256 n) internal pure returns (uint256) {
unchecked {
// must be unchecked in order to support `n = type(int256).min`
return uint256(n >= 0 ? n : -n);
}
}
}// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
// A representation of an empty/uninitialized UID.
bytes32 constant EMPTY_UID = 0;
// A zero expiration represents an non-expiring attestation.
uint64 constant NO_EXPIRATION_TIME = 0;
error AccessDenied();
error DeadlineExpired();
error InvalidEAS();
error InvalidLength();
error InvalidSignature();
error NotFound();
/// @notice A struct representing ECDSA signature data.
struct Signature {
uint8 v; // The recovery ID.
bytes32 r; // The x-coordinate of the nonce R.
bytes32 s; // The signature data.
}
/// @notice A struct representing a single attestation.
struct Attestation {
bytes32 uid; // A unique identifier of the attestation.
bytes32 schema; // The unique identifier of the schema.
uint64 time; // The time when the attestation was created (Unix timestamp).
uint64 expirationTime; // The time when the attestation expires (Unix timestamp).
uint64 revocationTime; // The time when the attestation was revoked (Unix timestamp).
bytes32 refUID; // The UID of the related attestation.
address recipient; // The recipient of the attestation.
address attester; // The attester/sender of the attestation.
bool revocable; // Whether the attestation is revocable.
bytes data; // Custom attestation data.
}
/// @notice A helper function to work with unchecked iterators in loops.
function uncheckedInc(uint256 i) pure returns (uint256 j) {
unchecked {
j = i + 1;
}
}// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import { ISemver } from "./ISemver.sol";
import { ISchemaResolver } from "./resolver/ISchemaResolver.sol";
/// @notice A struct representing a record for a submitted schema.
struct SchemaRecord {
bytes32 uid; // The unique identifier of the schema.
ISchemaResolver resolver; // Optional schema resolver.
bool revocable; // Whether the schema allows revocations explicitly.
string schema; // Custom specification of the schema (e.g., an ABI).
}
/// @title ISchemaRegistry
/// @notice The interface of global attestation schemas for the Ethereum Attestation Service protocol.
interface ISchemaRegistry is ISemver {
/// @notice Emitted when a new schema has been registered
/// @param uid The schema UID.
/// @param registerer The address of the account used to register the schema.
/// @param schema The schema data.
event Registered(bytes32 indexed uid, address indexed registerer, SchemaRecord schema);
/// @notice Submits and reserves a new schema
/// @param schema The schema data schema.
/// @param resolver An optional schema resolver.
/// @param revocable Whether the schema allows revocations explicitly.
/// @return The UID of the new schema.
function register(string calldata schema, ISchemaResolver resolver, bool revocable) external returns (bytes32);
/// @notice Returns an existing schema by UID
/// @param uid The UID of the schema to retrieve.
/// @return The schema data members.
function getSchema(bytes32 uid) external view returns (SchemaRecord memory);
}// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/// @title ISemver
/// @notice A semver interface.
interface ISemver {
/// @notice Returns the full semver contract version.
/// @return Semver contract version as a string.
function version() external view returns (string memory);
}// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
import { Strings } from "@openzeppelin/contracts/utils/Strings.sol";
import { ISemver } from "./ISemver.sol";
/// @title Semver
/// @notice A simple contract for managing contract versions.
contract Semver is ISemver {
// Contract's major version number.
uint256 private immutable _major;
// Contract's minor version number.
uint256 private immutable _minor;
// Contract's patch version number.
uint256 private immutable _patch;
/// @dev Create a new Semver instance.
/// @param major Major version number.
/// @param minor Minor version number.
/// @param patch Patch version number.
constructor(uint256 major, uint256 minor, uint256 patch) {
_major = major;
_minor = minor;
_patch = patch;
}
/// @notice Returns the full semver contract version.
/// @return Semver contract version as a string.
function version() external view returns (string memory) {
return
string(
abi.encodePacked(Strings.toString(_major), ".", Strings.toString(_minor), ".", Strings.toString(_patch))
);
}
}// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import { ISemver } from "../ISemver.sol";
import { Attestation } from "../Common.sol";
/// @title ISchemaResolver
/// @notice The interface of an optional schema resolver.
interface ISchemaResolver is ISemver {
/// @notice Checks if the resolver can be sent ETH.
/// @return Whether the resolver supports ETH transfers.
function isPayable() external pure returns (bool);
/// @notice Processes an attestation and verifies whether it's valid.
/// @param attestation The new attestation.
/// @return Whether the attestation is valid.
function attest(Attestation calldata attestation) external payable returns (bool);
/// @notice Processes multiple attestations and verifies whether they are valid.
/// @param attestations The new attestations.
/// @param values Explicit ETH amounts which were sent with each attestation.
/// @return Whether all the attestations are valid.
function multiAttest(
Attestation[] calldata attestations,
uint256[] calldata values
) external payable returns (bool);
/// @notice Processes an attestation revocation and verifies if it can be revoked.
/// @param attestation The existing attestation to be revoked.
/// @return Whether the attestation can be revoked.
function revoke(Attestation calldata attestation) external payable returns (bool);
/// @notice Processes revocation of multiple attestation and verifies they can be revoked.
/// @param attestations The existing attestations to be revoked.
/// @param values Explicit ETH amounts which were sent with each revocation.
/// @return Whether the attestations can be revoked.
function multiRevoke(
Attestation[] calldata attestations,
uint256[] calldata values
) external payable returns (bool);
}{
"evmVersion": "paris",
"libraries": {},
"metadata": {
"bytecodeHash": "none",
"useLiteralContent": true
},
"optimizer": {
"enabled": true,
"runs": 1000000
},
"remappings": [],
"outputSelection": {
"*": {
"*": [
"evm.bytecode",
"evm.deployedBytecode",
"devdoc",
"userdoc",
"metadata",
"abi"
]
}
}
}Contract Security Audit
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Contract ABI
API[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"AlreadyExists","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"uid","type":"bytes32"},{"indexed":true,"internalType":"address","name":"registerer","type":"address"},{"components":[{"internalType":"bytes32","name":"uid","type":"bytes32"},{"internalType":"contract ISchemaResolver","name":"resolver","type":"address"},{"internalType":"bool","name":"revocable","type":"bool"},{"internalType":"string","name":"schema","type":"string"}],"indexed":false,"internalType":"struct SchemaRecord","name":"schema","type":"tuple"}],"name":"Registered","type":"event"},{"inputs":[{"internalType":"bytes32","name":"uid","type":"bytes32"}],"name":"getSchema","outputs":[{"components":[{"internalType":"bytes32","name":"uid","type":"bytes32"},{"internalType":"contract ISchemaResolver","name":"resolver","type":"address"},{"internalType":"bool","name":"revocable","type":"bool"},{"internalType":"string","name":"schema","type":"string"}],"internalType":"struct SchemaRecord","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"schema","type":"string"},{"internalType":"contract ISchemaResolver","name":"resolver","type":"address"},{"internalType":"bool","name":"revocable","type":"bool"}],"name":"register","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"}]Contract Creation Code
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Deployed Bytecode
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