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Latest 25 from a total of 172,567 transactions
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Attest By Delega... | 11687488 | 38 hrs ago | IN | 0 ETH | 0.00003251 | ||||
Attest By Delega... | 11678766 | 46 hrs ago | IN | 0 ETH | 0.00003421 | ||||
Attest By Delega... | 11656556 | 2 days ago | IN | 0 ETH | 0.00003767 | ||||
Attest By Delega... | 11656554 | 2 days ago | IN | 0 ETH | 0.00003742 | ||||
Attest By Delega... | 11656397 | 2 days ago | IN | 0 ETH | 0.00004077 | ||||
Attest By Delega... | 11656395 | 2 days ago | IN | 0 ETH | 0.00004202 | ||||
Attest By Delega... | 11656392 | 2 days ago | IN | 0 ETH | 0.00004159 | ||||
Attest By Delega... | 11656390 | 2 days ago | IN | 0 ETH | 0.00004132 | ||||
Attest By Delega... | 11656389 | 2 days ago | IN | 0 ETH | 0.00004132 | ||||
Attest By Delega... | 11656388 | 2 days ago | IN | 0 ETH | 0.00004132 | ||||
Attest By Delega... | 11656219 | 2 days ago | IN | 0 ETH | 0.00003979 | ||||
Attest By Delega... | 11656217 | 2 days ago | IN | 0 ETH | 0.00003986 | ||||
Attest By Delega... | 11656216 | 2 days ago | IN | 0 ETH | 0.00003986 | ||||
Attest By Delega... | 11656215 | 2 days ago | IN | 0 ETH | 0.00003986 | ||||
Attest By Delega... | 11656213 | 2 days ago | IN | 0 ETH | 0.00004022 | ||||
Attest By Delega... | 11656030 | 2 days ago | IN | 0 ETH | 0.00003827 | ||||
Attest By Delega... | 11656028 | 2 days ago | IN | 0 ETH | 0.00003827 | ||||
Attest By Delega... | 11656025 | 2 days ago | IN | 0 ETH | 0.00003827 | ||||
Attest By Delega... | 11656023 | 2 days ago | IN | 0 ETH | 0.00003827 | ||||
Attest By Delega... | 11656022 | 2 days ago | IN | 0 ETH | 0.00003827 | ||||
Attest By Delega... | 11656017 | 2 days ago | IN | 0 ETH | 0.00003798 | ||||
Attest By Delega... | 11655738 | 2 days ago | IN | 0 ETH | 0.00003845 | ||||
Attest By Delega... | 11655737 | 2 days ago | IN | 0 ETH | 0.0000381 | ||||
Attest By Delega... | 11655736 | 2 days ago | IN | 0 ETH | 0.0000381 | ||||
Attest By Delega... | 11655734 | 2 days ago | IN | 0 ETH | 0.00003665 |
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Contract Name:
AttesterProxy
Compiler Version
v0.8.19+commit.7dd6d404
Optimization Enabled:
Yes with 200 runs
Other Settings:
london EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.8.19; import { EIP712Proxy, AttestationRequest, RevocationRequest, DelegatedProxyAttestationRequest } from "@eas/contracts/eip712/proxy/EIP712Proxy.sol"; import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol"; import {AccessDenied} from "@eas/contracts/Common.sol"; import {IEAS, Attestation} from "@eas/contracts/IEAS.sol"; /// @title AttesterProxy /// @notice An EIP712 proxy that allows only specific addresses to attest. /// Based on PermissionedEIP712Proxy in the EAS repo. contract AttesterProxy is EIP712Proxy, Ownable { // The global EAS contract. IEAS private immutable _eas; // Authorized badge attester accounts. mapping(address => bool) public isAttester; /// @dev Creates a new PermissionedEIP712Proxy instance. /// @param eas The address of the global EAS contract. constructor(IEAS eas) EIP712Proxy(eas, "AttesterProxy") { _eas = eas; } /// @notice Enables or disables a given attester. /// @param attester The attester address. /// @param enable True if enable, false if disable. function toggleAttester(address attester, bool enable) external onlyOwner { isAttester[attester] = enable; } /// @inheritdoc EIP712Proxy function attestByDelegation(DelegatedProxyAttestationRequest calldata delegatedRequest) public payable override returns (bytes32) { // Ensure that only the owner is allowed to delegate attestations. _verifyAttester(delegatedRequest.attester); // Ensure that only the recipient can submit delegated attestation transactions. if (msg.sender != delegatedRequest.data.recipient) { revert AccessDenied(); } return super.attestByDelegation(delegatedRequest); } /// @notice Create attestation through the proxy. /// @param request The arguments of the attestation request. /// @return The UID of the new attestation. function attest(AttestationRequest calldata request) external returns (bytes32) { _verifyAttester(msg.sender); return _eas.attest(request); } /// @notice Revoke attestation through the proxy. /// @param request The arguments of the revocation request. function revoke(RevocationRequest calldata request) external { _verifyAttester(msg.sender); _eas.revoke(request); } /// @dev Ensures that only the allowed attester can attest. /// @param attester The attester to verify. function _verifyAttester(address attester) private view { if (!isAttester[attester]) { revert AccessDenied(); } } }
// 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 { ISchemaRegistry } from "./ISchemaRegistry.sol"; import { ISemver } from "./ISemver.sol"; import { Attestation, Signature } from "./Common.sol"; /// @notice A struct representing the arguments of the attestation request. struct AttestationRequestData { address recipient; // The recipient of the attestation. uint64 expirationTime; // The time when the attestation expires (Unix timestamp). bool revocable; // Whether the attestation is revocable. bytes32 refUID; // The UID of the related attestation. bytes data; // Custom attestation data. uint256 value; // An explicit ETH amount to send to the resolver. This is important to prevent accidental user errors. } /// @notice A struct representing the full arguments of the attestation request. struct AttestationRequest { bytes32 schema; // The unique identifier of the schema. AttestationRequestData data; // The arguments of the attestation request. } /// @notice A struct representing the full arguments of the full delegated attestation request. struct DelegatedAttestationRequest { bytes32 schema; // The unique identifier of the schema. AttestationRequestData data; // The arguments of the attestation request. Signature signature; // The ECDSA signature data. address attester; // The attesting account. uint64 deadline; // The deadline of the signature/request. } /// @notice A struct representing the full arguments of the multi attestation request. struct MultiAttestationRequest { bytes32 schema; // The unique identifier of the schema. AttestationRequestData[] data; // The arguments of the attestation request. } /// @notice A struct representing the full arguments of the delegated multi attestation request. struct MultiDelegatedAttestationRequest { bytes32 schema; // The unique identifier of the schema. AttestationRequestData[] data; // The arguments of the attestation requests. Signature[] signatures; // The ECDSA signatures data. Please note that the signatures are assumed to be signed with increasing nonces. address attester; // The attesting account. uint64 deadline; // The deadline of the signature/request. } /// @notice A struct representing the arguments of the revocation request. struct RevocationRequestData { bytes32 uid; // The UID of the attestation to revoke. uint256 value; // An explicit ETH amount to send to the resolver. This is important to prevent accidental user errors. } /// @notice A struct representing the full arguments of the revocation request. struct RevocationRequest { bytes32 schema; // The unique identifier of the schema. RevocationRequestData data; // The arguments of the revocation request. } /// @notice A struct representing the arguments of the full delegated revocation request. struct DelegatedRevocationRequest { bytes32 schema; // The unique identifier of the schema. RevocationRequestData data; // The arguments of the revocation request. Signature signature; // The ECDSA signature data. address revoker; // The revoking account. uint64 deadline; // The deadline of the signature/request. } /// @notice A struct representing the full arguments of the multi revocation request. struct MultiRevocationRequest { bytes32 schema; // The unique identifier of the schema. RevocationRequestData[] data; // The arguments of the revocation request. } /// @notice A struct representing the full arguments of the delegated multi revocation request. struct MultiDelegatedRevocationRequest { bytes32 schema; // The unique identifier of the schema. RevocationRequestData[] data; // The arguments of the revocation requests. Signature[] signatures; // The ECDSA signatures data. Please note that the signatures are assumed to be signed with increasing nonces. address revoker; // The revoking account. uint64 deadline; // The deadline of the signature/request. } /// @title IEAS /// @notice EAS - Ethereum Attestation Service interface. interface IEAS is ISemver { /// @notice Emitted when an attestation has been made. /// @param recipient The recipient of the attestation. /// @param attester The attesting account. /// @param uid The UID the revoked attestation. /// @param schemaUID The UID of the schema. event Attested(address indexed recipient, address indexed attester, bytes32 uid, bytes32 indexed schemaUID); /// @notice Emitted when an attestation has been revoked. /// @param recipient The recipient of the attestation. /// @param attester The attesting account. /// @param schemaUID The UID of the schema. /// @param uid The UID the revoked attestation. event Revoked(address indexed recipient, address indexed attester, bytes32 uid, bytes32 indexed schemaUID); /// @notice Emitted when a data has been timestamped. /// @param data The data. /// @param timestamp The timestamp. event Timestamped(bytes32 indexed data, uint64 indexed timestamp); /// @notice Emitted when a data has been revoked. /// @param revoker The address of the revoker. /// @param data The data. /// @param timestamp The timestamp. event RevokedOffchain(address indexed revoker, bytes32 indexed data, uint64 indexed timestamp); /// @notice Returns the address of the global schema registry. /// @return The address of the global schema registry. function getSchemaRegistry() external view returns (ISchemaRegistry); /// @notice Attests to a specific schema. /// @param request The arguments of the attestation request. /// @return The UID of the new attestation. /// /// Example: /// attest({ /// schema: "0facc36681cbe2456019c1b0d1e7bedd6d1d40f6f324bf3dd3a4cef2999200a0", /// data: { /// recipient: "0xdEADBeAFdeAdbEafdeadbeafDeAdbEAFdeadbeaf", /// expirationTime: 0, /// revocable: true, /// refUID: "0x0000000000000000000000000000000000000000000000000000000000000000", /// data: "0xF00D", /// value: 0 /// } /// }) function attest(AttestationRequest calldata request) external payable returns (bytes32); /// @notice Attests to a specific schema via the provided ECDSA signature. /// @param delegatedRequest The arguments of the delegated attestation request. /// @return The UID of the new attestation. /// /// Example: /// attestByDelegation({ /// schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', /// data: { /// recipient: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266', /// expirationTime: 1673891048, /// revocable: true, /// refUID: '0x0000000000000000000000000000000000000000000000000000000000000000', /// data: '0x1234', /// value: 0 /// }, /// signature: { /// v: 28, /// r: '0x148c...b25b', /// s: '0x5a72...be22' /// }, /// attester: '0xc5E8740aD971409492b1A63Db8d83025e0Fc427e', /// deadline: 1673891048 /// }) function attestByDelegation( DelegatedAttestationRequest calldata delegatedRequest ) external payable returns (bytes32); /// @notice Attests to multiple schemas. /// @param multiRequests The arguments of the multi attestation requests. The requests should be grouped by distinct /// schema ids to benefit from the best batching optimization. /// @return The UIDs of the new attestations. /// /// Example: /// multiAttest([{ /// schema: '0x33e9094830a5cba5554d1954310e4fbed2ef5f859ec1404619adea4207f391fd', /// data: [{ /// recipient: '0xdEADBeAFdeAdbEafdeadbeafDeAdbEAFdeadbeaf', /// expirationTime: 1673891048, /// revocable: true, /// refUID: '0x0000000000000000000000000000000000000000000000000000000000000000', /// data: '0x1234', /// value: 1000 /// }, /// { /// recipient: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266', /// expirationTime: 0, /// revocable: false, /// refUID: '0x480df4a039efc31b11bfdf491b383ca138b6bde160988222a2a3509c02cee174', /// data: '0x00', /// value: 0 /// }], /// }, /// { /// schema: '0x5ac273ce41e3c8bfa383efe7c03e54c5f0bff29c9f11ef6ffa930fc84ca32425', /// data: [{ /// recipient: '0xdEADBeAFdeAdbEafdeadbeafDeAdbEAFdeadbeaf', /// expirationTime: 0, /// revocable: true, /// refUID: '0x75bf2ed8dca25a8190c50c52db136664de25b2449535839008ccfdab469b214f', /// data: '0x12345678', /// value: 0 /// }, /// }]) function multiAttest(MultiAttestationRequest[] calldata multiRequests) external payable returns (bytes32[] memory); /// @notice Attests to multiple schemas using via provided ECDSA signatures. /// @param multiDelegatedRequests The arguments of the delegated multi attestation requests. The requests should be /// grouped by distinct schema ids to benefit from the best batching optimization. /// @return The UIDs of the new attestations. /// /// Example: /// multiAttestByDelegation([{ /// schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', /// data: [{ /// recipient: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266', /// expirationTime: 1673891048, /// revocable: true, /// refUID: '0x0000000000000000000000000000000000000000000000000000000000000000', /// data: '0x1234', /// value: 0 /// }, /// { /// recipient: '0xdEADBeAFdeAdbEafdeadbeafDeAdbEAFdeadbeaf', /// expirationTime: 0, /// revocable: false, /// refUID: '0x0000000000000000000000000000000000000000000000000000000000000000', /// data: '0x00', /// value: 0 /// }], /// signatures: [{ /// v: 28, /// r: '0x148c...b25b', /// s: '0x5a72...be22' /// }, /// { /// v: 28, /// r: '0x487s...67bb', /// s: '0x12ad...2366' /// }], /// attester: '0x1D86495b2A7B524D747d2839b3C645Bed32e8CF4', /// deadline: 1673891048 /// }]) function multiAttestByDelegation( MultiDelegatedAttestationRequest[] calldata multiDelegatedRequests ) external payable returns (bytes32[] memory); /// @notice Revokes an existing attestation to a specific schema. /// @param request The arguments of the revocation request. /// /// Example: /// revoke({ /// schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', /// data: { /// uid: '0x101032e487642ee04ee17049f99a70590c735b8614079fc9275f9dd57c00966d', /// value: 0 /// } /// }) function revoke(RevocationRequest calldata request) external payable; /// @notice Revokes an existing attestation to a specific schema via the provided ECDSA signature. /// @param delegatedRequest The arguments of the delegated revocation request. /// /// Example: /// revokeByDelegation({ /// schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', /// data: { /// uid: '0xcbbc12102578c642a0f7b34fe7111e41afa25683b6cd7b5a14caf90fa14d24ba', /// value: 0 /// }, /// signature: { /// v: 27, /// r: '0xb593...7142', /// s: '0x0f5b...2cce' /// }, /// revoker: '0x244934dd3e31bE2c81f84ECf0b3E6329F5381992', /// deadline: 1673891048 /// }) function revokeByDelegation(DelegatedRevocationRequest calldata delegatedRequest) external payable; /// @notice Revokes existing attestations to multiple schemas. /// @param multiRequests The arguments of the multi revocation requests. The requests should be grouped by distinct /// schema ids to benefit from the best batching optimization. /// /// Example: /// multiRevoke([{ /// schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', /// data: [{ /// uid: '0x211296a1ca0d7f9f2cfebf0daaa575bea9b20e968d81aef4e743d699c6ac4b25', /// value: 1000 /// }, /// { /// uid: '0xe160ac1bd3606a287b4d53d5d1d6da5895f65b4b4bab6d93aaf5046e48167ade', /// value: 0 /// }], /// }, /// { /// schema: '0x5ac273ce41e3c8bfa383efe7c03e54c5f0bff29c9f11ef6ffa930fc84ca32425', /// data: [{ /// uid: '0x053d42abce1fd7c8fcddfae21845ad34dae287b2c326220b03ba241bc5a8f019', /// value: 0 /// }, /// }]) function multiRevoke(MultiRevocationRequest[] calldata multiRequests) external payable; /// @notice Revokes existing attestations to multiple schemas via provided ECDSA signatures. /// @param multiDelegatedRequests The arguments of the delegated multi revocation attestation requests. The requests /// should be grouped by distinct schema ids to benefit from the best batching optimization. /// /// Example: /// multiRevokeByDelegation([{ /// schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', /// data: [{ /// uid: '0x211296a1ca0d7f9f2cfebf0daaa575bea9b20e968d81aef4e743d699c6ac4b25', /// value: 1000 /// }, /// { /// uid: '0xe160ac1bd3606a287b4d53d5d1d6da5895f65b4b4bab6d93aaf5046e48167ade', /// value: 0 /// }], /// signatures: [{ /// v: 28, /// r: '0x148c...b25b', /// s: '0x5a72...be22' /// }, /// { /// v: 28, /// r: '0x487s...67bb', /// s: '0x12ad...2366' /// }], /// revoker: '0x244934dd3e31bE2c81f84ECf0b3E6329F5381992', /// deadline: 1673891048 /// }]) function multiRevokeByDelegation( MultiDelegatedRevocationRequest[] calldata multiDelegatedRequests ) external payable; /// @notice Timestamps the specified bytes32 data. /// @param data The data to timestamp. /// @return The timestamp the data was timestamped with. function timestamp(bytes32 data) external returns (uint64); /// @notice Timestamps the specified multiple bytes32 data. /// @param data The data to timestamp. /// @return The timestamp the data was timestamped with. function multiTimestamp(bytes32[] calldata data) external returns (uint64); /// @notice Revokes the specified bytes32 data. /// @param data The data to timestamp. /// @return The timestamp the data was revoked with. function revokeOffchain(bytes32 data) external returns (uint64); /// @notice Revokes the specified multiple bytes32 data. /// @param data The data to timestamp. /// @return The timestamp the data was revoked with. function multiRevokeOffchain(bytes32[] calldata data) external returns (uint64); /// @notice Returns an existing attestation by UID. /// @param uid The UID of the attestation to retrieve. /// @return The attestation data members. function getAttestation(bytes32 uid) external view returns (Attestation memory); /// @notice Checks whether an attestation exists. /// @param uid The UID of the attestation to retrieve. /// @return Whether an attestation exists. function isAttestationValid(bytes32 uid) external view returns (bool); /// @notice Returns the timestamp that the specified data was timestamped with. /// @param data The data to query. /// @return The timestamp the data was timestamped with. function getTimestamp(bytes32 data) external view returns (uint64); /// @notice Returns the timestamp that the specified data was timestamped with. /// @param data The data to query. /// @return The timestamp the data was timestamped with. function getRevokeOffchain(address revoker, bytes32 data) external view returns (uint64); }
// 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 _path; /// @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; _path = 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(_path)) ); } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.19; import { EIP712 } from "@openzeppelin/contracts/utils/cryptography/EIP712.sol"; import { ECDSA } from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol"; // prettier-ignore import { AccessDenied, DeadlineExpired, Signature, InvalidEAS, InvalidLength, InvalidSignature, NotFound, NO_EXPIRATION_TIME, uncheckedInc } from "../../Common.sol"; // prettier-ignore import { AttestationRequest, AttestationRequestData, DelegatedAttestationRequest, DelegatedRevocationRequest, IEAS, MultiAttestationRequest, MultiDelegatedAttestationRequest, MultiDelegatedRevocationRequest, MultiRevocationRequest, RevocationRequest, RevocationRequestData } from "../../IEAS.sol"; import { Semver } from "../../Semver.sol"; /// @notice A struct representing the full arguments of the full delegated attestation request. struct DelegatedProxyAttestationRequest { bytes32 schema; // The unique identifier of the schema. AttestationRequestData data; // The arguments of the attestation request. Signature signature; // The EIP712 signature data. address attester; // The attesting account. uint64 deadline; // The deadline of the signature/request. } /// @notice A struct representing the full arguments of the delegated multi attestation request. struct MultiDelegatedProxyAttestationRequest { bytes32 schema; // The unique identifier of the schema. AttestationRequestData[] data; // The arguments of the attestation requests. Signature[] signatures; // The EIP712 signatures data. Please note that the signatures are assumed to be signed with increasing nonces. address attester; // The attesting account. uint64 deadline; // The deadline of the signature/request. } /// @notice A struct representing the arguments of the full delegated revocation request. struct DelegatedProxyRevocationRequest { bytes32 schema; // The unique identifier of the schema. RevocationRequestData data; // The arguments of the revocation request. Signature signature; // The EIP712 signature data. address revoker; // The revoking account. uint64 deadline; // The deadline of the signature/request. } /// @notice A struct representing the full arguments of the delegated multi revocation request. struct MultiDelegatedProxyRevocationRequest { bytes32 schema; // The unique identifier of the schema. RevocationRequestData[] data; // The arguments of the revocation requests. Signature[] signatures; // The EIP712 signatures data. Please note that the signatures are assumed to be signed with increasing nonces. address revoker; // The revoking account. uint64 deadline; // The deadline of the signature/request. } /// @title EIP712Proxy /// @notice This utility contract an be used to aggregate delegated attestations without requiring a specific order via /// nonces. The contract doesn't request nonces and implements replay protection by storing ***immalleable*** /// signatures. contract EIP712Proxy is Semver, EIP712 { error UsedSignature(); // The hash of the data type used to relay calls to the attest function. It's the value of // keccak256("Attest(address attester,bytes32 schema,address recipient,uint64 expirationTime,bool revocable,bytes32 refUID,bytes data,uint256 value,uint64 deadline)"). bytes32 private constant ATTEST_PROXY_TYPEHASH = 0xea02ffba7dcb45f6fc649714d23f315eef12e3b27f9a7735d8d8bf41eb2b1af1; // The hash of the data type used to relay calls to the revoke function. It's the value of // keccak256("Revoke(address revoker,bytes32 schema,bytes32 uid,uint256 value,uint64 deadline)"). bytes32 private constant REVOKE_PROXY_TYPEHASH = 0x78a69a78c1a55cdff5cbf949580b410778cd9e4d1ecbe6f06a7fa8dc2441b57d; // The global EAS contract. IEAS private immutable _eas; // The user readable name of the signing domain. string private _name; // The global mapping between proxy attestations and their attesters, so that we can verify that only the original // attester is able to revert attestations by proxy. mapping(bytes32 uid => address attester) private _attesters; // Replay protection signatures. mapping(bytes signature => bool used) private _signatures; /// @dev Creates a new EIP1271Verifier instance. /// @param eas The address of the global EAS contract. /// @param name The user readable name of the signing domain. constructor(IEAS eas, string memory name) Semver(1, 3, 0) EIP712(name, "1.3.0") { if (address(eas) == address(0)) { revert InvalidEAS(); } _eas = eas; _name = name; } /// @notice Returns the EAS. function getEAS() external view returns (IEAS) { return _eas; } /// @notice Returns the domain separator used in the encoding of the signatures for attest, and revoke. function getDomainSeparator() external view returns (bytes32) { return _domainSeparatorV4(); } /// Returns the EIP712 type hash for the attest function. function getAttestTypeHash() external pure returns (bytes32) { return ATTEST_PROXY_TYPEHASH; } /// Returns the EIP712 type hash for the revoke function. function getRevokeTypeHash() external pure returns (bytes32) { return REVOKE_PROXY_TYPEHASH; } /// Returns the EIP712 name. function getName() external view returns (string memory) { return _name; } /// Returns the attester for a given uid. function getAttester(bytes32 uid) external view returns (address) { return _attesters[uid]; } /// @notice Attests to a specific schema via the provided EIP712 signature. /// @param delegatedRequest The arguments of the delegated attestation request. /// @return The UID of the new attestation. /// /// Example: /// attestByDelegation({ /// schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', /// data: { /// recipient: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266', /// expirationTime: 1673891048, /// revocable: true, /// refUID: '0x0000000000000000000000000000000000000000000000000000000000000000', /// data: '0x1234', /// value: 0 /// }, /// signature: { /// v: 28, /// r: '0x148c...b25b', /// s: '0x5a72...be22' /// }, /// attester: '0xc5E8740aD971409492b1A63Db8d83025e0Fc427e', /// deadline: 1673891048 /// }) function attestByDelegation( DelegatedProxyAttestationRequest calldata delegatedRequest ) public payable virtual returns (bytes32) { _verifyAttest(delegatedRequest); bytes32 uid = _eas.attest{ value: msg.value }( AttestationRequest({ schema: delegatedRequest.schema, data: delegatedRequest.data }) ); _attesters[uid] = delegatedRequest.attester; return uid; } /// @notice Attests to multiple schemas using via provided EIP712 signatures. /// @param multiDelegatedRequests The arguments of the delegated multi attestation requests. The requests should be /// grouped by distinct schema ids to benefit from the best batching optimization. /// @return The UIDs of the new attestations. /// /// Example: /// multiAttestByDelegation([{ /// schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', /// data: [{ /// recipient: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266', /// expirationTime: 1673891048, /// revocable: true, /// refUID: '0x0000000000000000000000000000000000000000000000000000000000000000', /// data: '0x1234', /// value: 0 /// }, /// { /// recipient: '0xdEADBeAFdeAdbEafdeadbeafDeAdbEAFdeadbeaf', /// expirationTime: 0, /// revocable: false, /// refUID: '0x0000000000000000000000000000000000000000000000000000000000000000', /// data: '0x00', /// value: 0 /// }], /// signatures: [{ /// v: 28, /// r: '0x148c...b25b', /// s: '0x5a72...be22' /// }, /// { /// v: 28, /// r: '0x487s...67bb', /// s: '0x12ad...2366' /// }], /// attester: '0x1D86495b2A7B524D747d2839b3C645Bed32e8CF4', /// deadline: 1673891048 /// }]) function multiAttestByDelegation( MultiDelegatedProxyAttestationRequest[] calldata multiDelegatedRequests ) public payable virtual returns (bytes32[] memory) { uint256 length = multiDelegatedRequests.length; MultiAttestationRequest[] memory multiRequests = new MultiAttestationRequest[](length); for (uint256 i = 0; i < length; i = uncheckedInc(i)) { MultiDelegatedProxyAttestationRequest calldata multiDelegatedRequest = multiDelegatedRequests[i]; AttestationRequestData[] calldata data = multiDelegatedRequest.data; // Ensure that no inputs are missing. uint256 dataLength = data.length; if (dataLength == 0 || dataLength != multiDelegatedRequest.signatures.length) { revert InvalidLength(); } // Verify EIP712 signatures. Please note that the signatures are assumed to be signed with increasing nonces. for (uint256 j = 0; j < dataLength; j = uncheckedInc(j)) { _verifyAttest( DelegatedProxyAttestationRequest({ schema: multiDelegatedRequest.schema, data: data[j], signature: multiDelegatedRequest.signatures[j], attester: multiDelegatedRequest.attester, deadline: multiDelegatedRequest.deadline }) ); } multiRequests[i] = MultiAttestationRequest({ schema: multiDelegatedRequest.schema, data: data }); } bytes32[] memory uids = _eas.multiAttest{ value: msg.value }(multiRequests); // Store all attesters, according to the order of the attestation requests. uint256 uidCounter = 0; for (uint256 i = 0; i < length; i = uncheckedInc(i)) { MultiDelegatedProxyAttestationRequest calldata multiDelegatedRequest = multiDelegatedRequests[i]; AttestationRequestData[] calldata data = multiDelegatedRequest.data; uint256 dataLength = data.length; for (uint256 j = 0; j < dataLength; j = uncheckedInc(j)) { _attesters[uids[uidCounter]] = multiDelegatedRequest.attester; unchecked { ++uidCounter; } } } return uids; } /// @notice Revokes an existing attestation to a specific schema via the provided EIP712 signature. /// @param delegatedRequest The arguments of the delegated revocation request. /// /// Example: /// revokeByDelegation({ /// schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', /// data: { /// uid: '0xcbbc12102578c642a0f7b34fe7111e41afa25683b6cd7b5a14caf90fa14d24ba', /// value: 0 /// }, /// signature: { /// v: 27, /// r: '0xb593...7142', /// s: '0x0f5b...2cce' /// }, /// revoker: '0x244934dd3e31bE2c81f84ECf0b3E6329F5381992', /// deadline: 1673891048 /// }) function revokeByDelegation(DelegatedProxyRevocationRequest calldata delegatedRequest) public payable virtual { _verifyRevoke(delegatedRequest); return _eas.revoke{ value: msg.value }( RevocationRequest({ schema: delegatedRequest.schema, data: delegatedRequest.data }) ); } /// @notice Revokes existing attestations to multiple schemas via provided EIP712 signatures. /// @param multiDelegatedRequests The arguments of the delegated multi revocation attestation requests. The requests /// should be grouped by distinct schema ids to benefit from the best batching optimization. /// /// Example: /// multiRevokeByDelegation([{ /// schema: '0x8e72f5bc0a8d4be6aa98360baa889040c50a0e51f32dbf0baa5199bd93472ebc', /// data: [{ /// uid: '0x211296a1ca0d7f9f2cfebf0daaa575bea9b20e968d81aef4e743d699c6ac4b25', /// value: 1000 /// }, /// { /// uid: '0xe160ac1bd3606a287b4d53d5d1d6da5895f65b4b4bab6d93aaf5046e48167ade', /// value: 0 /// }], /// signatures: [{ /// v: 28, /// r: '0x148c...b25b', /// s: '0x5a72...be22' /// }, /// { /// v: 28, /// r: '0x487s...67bb', /// s: '0x12ad...2366' /// }], /// revoker: '0x244934dd3e31bE2c81f84ECf0b3E6329F5381992', /// deadline: 1673891048 /// }]) function multiRevokeByDelegation( MultiDelegatedProxyRevocationRequest[] calldata multiDelegatedRequests ) public payable virtual { uint256 length = multiDelegatedRequests.length; MultiRevocationRequest[] memory multiRequests = new MultiRevocationRequest[](length); for (uint256 i = 0; i < length; i = uncheckedInc(i)) { MultiDelegatedProxyRevocationRequest memory multiDelegatedRequest = multiDelegatedRequests[i]; RevocationRequestData[] memory data = multiDelegatedRequest.data; // Ensure that no inputs are missing. uint256 dataLength = data.length; if (dataLength == 0 || dataLength != multiDelegatedRequest.signatures.length) { revert InvalidLength(); } // Verify EIP712 signatures. Please note that the signatures are assumed to be signed with increasing nonces. for (uint256 j = 0; j < dataLength; j = uncheckedInc(j)) { RevocationRequestData memory requestData = data[j]; _verifyRevoke( DelegatedProxyRevocationRequest({ schema: multiDelegatedRequest.schema, data: requestData, signature: multiDelegatedRequest.signatures[j], revoker: multiDelegatedRequest.revoker, deadline: multiDelegatedRequest.deadline }) ); } multiRequests[i] = MultiRevocationRequest({ schema: multiDelegatedRequest.schema, data: data }); } _eas.multiRevoke{ value: msg.value }(multiRequests); } /// @dev Verifies delegated attestation request. /// @param request The arguments of the delegated attestation request. function _verifyAttest(DelegatedProxyAttestationRequest memory request) internal { if (request.deadline != NO_EXPIRATION_TIME && request.deadline < _time()) { revert DeadlineExpired(); } AttestationRequestData memory data = request.data; Signature memory signature = request.signature; _verifyUnusedSignature(signature); bytes32 digest = _hashTypedDataV4( keccak256( abi.encode( ATTEST_PROXY_TYPEHASH, request.attester, request.schema, data.recipient, data.expirationTime, data.revocable, data.refUID, keccak256(data.data), data.value, request.deadline ) ) ); if (ECDSA.recover(digest, signature.v, signature.r, signature.s) != request.attester) { revert InvalidSignature(); } } /// @dev Verifies delegated revocation request. /// @param request The arguments of the delegated revocation request. function _verifyRevoke(DelegatedProxyRevocationRequest memory request) internal { if (request.deadline != NO_EXPIRATION_TIME && request.deadline < _time()) { revert DeadlineExpired(); } RevocationRequestData memory data = request.data; // Allow only original attesters to revoke their attestations. address attester = _attesters[data.uid]; if (attester == address(0)) { revert NotFound(); } if (attester != msg.sender) { revert AccessDenied(); } Signature memory signature = request.signature; _verifyUnusedSignature(signature); bytes32 digest = _hashTypedDataV4( keccak256( abi.encode( REVOKE_PROXY_TYPEHASH, request.revoker, request.schema, data.uid, data.value, request.deadline ) ) ); if (ECDSA.recover(digest, signature.v, signature.r, signature.s) != request.revoker) { revert InvalidSignature(); } } /// @dev Ensures that the provided EIP712 signature wasn't already used. /// @param signature The EIP712 signature data. function _verifyUnusedSignature(Signature memory signature) internal { bytes memory packedSignature = abi.encodePacked(signature.v, signature.r, signature.s); if (_signatures[packedSignature]) { revert UsedSignature(); } _signatures[packedSignature] = true; } /// @dev Returns the current's block timestamp. This method is overridden during tests and used to simulate the /// current block time. function _time() internal view virtual returns (uint64) { return uint64(block.timestamp); } }
// 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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor() { _transferOwnership(_msgSender()); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { require(owner() == _msgSender(), "Ownable: caller is not the owner"); } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby disabling any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _transferOwnership(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC5267.sol) pragma solidity ^0.8.0; interface IERC5267 { /** * @dev MAY be emitted to signal that the domain could have changed. */ event EIP712DomainChanged(); /** * @dev returns the fields and values that describe the domain separator used by this contract for EIP-712 * signature. */ function eip712Domain() external view returns ( bytes1 fields, string memory name, string memory version, uint256 chainId, address verifyingContract, bytes32 salt, uint256[] memory extensions ); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } function _contextSuffixLength() internal view virtual returns (uint256) { return 0; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (utils/ShortStrings.sol) pragma solidity ^0.8.8; import "./StorageSlot.sol"; // | string | 0xAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA | // | length | 0x BB | type ShortString is bytes32; /** * @dev This library provides functions to convert short memory strings * into a `ShortString` type that can be used as an immutable variable. * * Strings of arbitrary length can be optimized using this library if * they are short enough (up to 31 bytes) by packing them with their * length (1 byte) in a single EVM word (32 bytes). Additionally, a * fallback mechanism can be used for every other case. * * Usage example: * * ```solidity * contract Named { * using ShortStrings for *; * * ShortString private immutable _name; * string private _nameFallback; * * constructor(string memory contractName) { * _name = contractName.toShortStringWithFallback(_nameFallback); * } * * function name() external view returns (string memory) { * return _name.toStringWithFallback(_nameFallback); * } * } * ``` */ library ShortStrings { // Used as an identifier for strings longer than 31 bytes. bytes32 private constant _FALLBACK_SENTINEL = 0x00000000000000000000000000000000000000000000000000000000000000FF; error StringTooLong(string str); error InvalidShortString(); /** * @dev Encode a string of at most 31 chars into a `ShortString`. * * This will trigger a `StringTooLong` error is the input string is too long. */ function toShortString(string memory str) internal pure returns (ShortString) { bytes memory bstr = bytes(str); if (bstr.length > 31) { revert StringTooLong(str); } return ShortString.wrap(bytes32(uint256(bytes32(bstr)) | bstr.length)); } /** * @dev Decode a `ShortString` back to a "normal" string. */ function toString(ShortString sstr) internal pure returns (string memory) { uint256 len = byteLength(sstr); // using `new string(len)` would work locally but is not memory safe. string memory str = new string(32); /// @solidity memory-safe-assembly assembly { mstore(str, len) mstore(add(str, 0x20), sstr) } return str; } /** * @dev Return the length of a `ShortString`. */ function byteLength(ShortString sstr) internal pure returns (uint256) { uint256 result = uint256(ShortString.unwrap(sstr)) & 0xFF; if (result > 31) { revert InvalidShortString(); } return result; } /** * @dev Encode a string into a `ShortString`, or write it to storage if it is too long. */ function toShortStringWithFallback(string memory value, string storage store) internal returns (ShortString) { if (bytes(value).length < 32) { return toShortString(value); } else { StorageSlot.getStringSlot(store).value = value; return ShortString.wrap(_FALLBACK_SENTINEL); } } /** * @dev Decode a string that was encoded to `ShortString` or written to storage using {setWithFallback}. */ function toStringWithFallback(ShortString value, string storage store) internal pure returns (string memory) { if (ShortString.unwrap(value) != _FALLBACK_SENTINEL) { return toString(value); } else { return store; } } /** * @dev Return the length of a string that was encoded to `ShortString` or written to storage using {setWithFallback}. * * WARNING: This will return the "byte length" of the string. This may not reflect the actual length in terms of * actual characters as the UTF-8 encoding of a single character can span over multiple bytes. */ function byteLengthWithFallback(ShortString value, string storage store) internal view returns (uint256) { if (ShortString.unwrap(value) != _FALLBACK_SENTINEL) { return byteLength(value); } else { return bytes(store).length; } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (utils/StorageSlot.sol) // This file was procedurally generated from scripts/generate/templates/StorageSlot.js. pragma solidity ^0.8.0; /** * @dev Library for reading and writing primitive types to specific storage slots. * * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts. * This library helps with reading and writing to such slots without the need for inline assembly. * * The functions in this library return Slot structs that contain a `value` member that can be used to read or write. * * Example usage to set ERC1967 implementation slot: * ```solidity * contract ERC1967 { * bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc; * * function _getImplementation() internal view returns (address) { * return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value; * } * * function _setImplementation(address newImplementation) internal { * require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract"); * StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation; * } * } * ``` * * _Available since v4.1 for `address`, `bool`, `bytes32`, `uint256`._ * _Available since v4.9 for `string`, `bytes`._ */ library StorageSlot { struct AddressSlot { address value; } struct BooleanSlot { bool value; } struct Bytes32Slot { bytes32 value; } struct Uint256Slot { uint256 value; } struct StringSlot { string value; } struct BytesSlot { bytes value; } /** * @dev Returns an `AddressSlot` with member `value` located at `slot`. */ function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := slot } } /** * @dev Returns an `BooleanSlot` with member `value` located at `slot`. */ function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := slot } } /** * @dev Returns an `Bytes32Slot` with member `value` located at `slot`. */ function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := slot } } /** * @dev Returns an `Uint256Slot` with member `value` located at `slot`. */ function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := slot } } /** * @dev Returns an `StringSlot` with member `value` located at `slot`. */ function getStringSlot(bytes32 slot) internal pure returns (StringSlot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := slot } } /** * @dev Returns an `StringSlot` representation of the string storage pointer `store`. */ function getStringSlot(string storage store) internal pure returns (StringSlot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := store.slot } } /** * @dev Returns an `BytesSlot` with member `value` located at `slot`. */ function getBytesSlot(bytes32 slot) internal pure returns (BytesSlot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := slot } } /** * @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`. */ function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) { /// @solidity memory-safe-assembly assembly { r.slot := store.slot } } }
// 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/cryptography/ECDSA.sol) pragma solidity ^0.8.0; import "../Strings.sol"; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { enum RecoverError { NoError, InvalidSignature, InvalidSignatureLength, InvalidSignatureS, InvalidSignatureV // Deprecated in v4.8 } function _throwError(RecoverError error) private pure { if (error == RecoverError.NoError) { return; // no error: do nothing } else if (error == RecoverError.InvalidSignature) { revert("ECDSA: invalid signature"); } else if (error == RecoverError.InvalidSignatureLength) { revert("ECDSA: invalid signature length"); } else if (error == RecoverError.InvalidSignatureS) { revert("ECDSA: invalid signature 's' value"); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature` or error string. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] * * _Available since v4.3._ */ function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) { if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. /// @solidity memory-safe-assembly assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return tryRecover(hash, v, r, s); } else { return (address(0), RecoverError.InvalidSignatureLength); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, signature); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.3._ */ function tryRecover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address, RecoverError) { bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff); uint8 v = uint8((uint256(vs) >> 255) + 27); return tryRecover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately. * * _Available since v4.2._ */ function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, r, vs); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `v`, * `r` and `s` signature fields separately. * * _Available since v4.3._ */ function tryRecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address, RecoverError) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return (address(0), RecoverError.InvalidSignatureS); } // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); if (signer == address(0)) { return (address(0), RecoverError.InvalidSignature); } return (signer, RecoverError.NoError); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, * `r` and `s` signature fields separately. */ function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, v, r, s); _throwError(error); return recovered; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32 message) { // 32 is the length in bytes of hash, // enforced by the type signature above /// @solidity memory-safe-assembly assembly { mstore(0x00, "\x19Ethereum Signed Message:\n32") mstore(0x1c, hash) message := keccak256(0x00, 0x3c) } } /** * @dev Returns an Ethereum Signed Message, created from `s`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 data) { /// @solidity memory-safe-assembly assembly { let ptr := mload(0x40) mstore(ptr, "\x19\x01") mstore(add(ptr, 0x02), domainSeparator) mstore(add(ptr, 0x22), structHash) data := keccak256(ptr, 0x42) } } /** * @dev Returns an Ethereum Signed Data with intended validator, created from a * `validator` and `data` according to the version 0 of EIP-191. * * See {recover}. */ function toDataWithIntendedValidatorHash(address validator, bytes memory data) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x00", validator, data)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (utils/cryptography/EIP712.sol) pragma solidity ^0.8.8; import "./ECDSA.sol"; import "../ShortStrings.sol"; import "../../interfaces/IERC5267.sol"; /** * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data. * * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible, * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding * they need in their contracts using a combination of `abi.encode` and `keccak256`. * * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA * ({_hashTypedDataV4}). * * The implementation of the domain separator was designed to be as efficient as possible while still properly updating * the chain id to protect against replay attacks on an eventual fork of the chain. * * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask]. * * NOTE: In the upgradeable version of this contract, the cached values will correspond to the address, and the domain * separator of the implementation contract. This will cause the `_domainSeparatorV4` function to always rebuild the * separator from the immutable values, which is cheaper than accessing a cached version in cold storage. * * _Available since v3.4._ * * @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment */ abstract contract EIP712 is IERC5267 { using ShortStrings for *; bytes32 private constant _TYPE_HASH = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"); // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to // invalidate the cached domain separator if the chain id changes. bytes32 private immutable _cachedDomainSeparator; uint256 private immutable _cachedChainId; address private immutable _cachedThis; bytes32 private immutable _hashedName; bytes32 private immutable _hashedVersion; ShortString private immutable _name; ShortString private immutable _version; string private _nameFallback; string private _versionFallback; /** * @dev Initializes the domain separator and parameter caches. * * The meaning of `name` and `version` is specified in * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]: * * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol. * - `version`: the current major version of the signing domain. * * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart * contract upgrade]. */ constructor(string memory name, string memory version) { _name = name.toShortStringWithFallback(_nameFallback); _version = version.toShortStringWithFallback(_versionFallback); _hashedName = keccak256(bytes(name)); _hashedVersion = keccak256(bytes(version)); _cachedChainId = block.chainid; _cachedDomainSeparator = _buildDomainSeparator(); _cachedThis = address(this); } /** * @dev Returns the domain separator for the current chain. */ function _domainSeparatorV4() internal view returns (bytes32) { if (address(this) == _cachedThis && block.chainid == _cachedChainId) { return _cachedDomainSeparator; } else { return _buildDomainSeparator(); } } function _buildDomainSeparator() private view returns (bytes32) { return keccak256(abi.encode(_TYPE_HASH, _hashedName, _hashedVersion, block.chainid, address(this))); } /** * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this * function returns the hash of the fully encoded EIP712 message for this domain. * * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example: * * ```solidity * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode( * keccak256("Mail(address to,string contents)"), * mailTo, * keccak256(bytes(mailContents)) * ))); * address signer = ECDSA.recover(digest, signature); * ``` */ function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) { return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash); } /** * @dev See {EIP-5267}. * * _Available since v4.9._ */ function eip712Domain() public view virtual override returns ( bytes1 fields, string memory name, string memory version, uint256 chainId, address verifyingContract, bytes32 salt, uint256[] memory extensions ) { return ( hex"0f", // 01111 _name.toStringWithFallback(_nameFallback), _version.toStringWithFallback(_versionFallback), block.chainid, address(this), bytes32(0), new uint256[](0) ); } }
// 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); } } }
{ "remappings": [ "@eas/=node_modules/@ethereum-attestation-service/eas-contracts/", "@openzeppelin/=node_modules/@openzeppelin/", "ds-test/=lib/forge-std/lib/ds-test/src/", "forge-std/=lib/forge-std/src/", "solmate/=node_modules/solmate/src/" ], "optimizer": { "enabled": true, "runs": 200 }, "metadata": { "bytecodeHash": "ipfs", "appendCBOR": true }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "evmVersion": "london", "libraries": {} }
Contract Security Audit
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IEAS","name":"eas","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"AccessDenied","type":"error"},{"inputs":[],"name":"DeadlineExpired","type":"error"},{"inputs":[],"name":"InvalidEAS","type":"error"},{"inputs":[],"name":"InvalidLength","type":"error"},{"inputs":[],"name":"InvalidShortString","type":"error"},{"inputs":[],"name":"InvalidSignature","type":"error"},{"inputs":[],"name":"NotFound","type":"error"},{"inputs":[{"internalType":"string","name":"str","type":"string"}],"name":"StringTooLong","type":"error"},{"inputs":[],"name":"UsedSignature","type":"error"},{"anonymous":false,"inputs":[],"name":"EIP712DomainChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"components":[{"internalType":"bytes32","name":"schema","type":"bytes32"},{"components":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint64","name":"expirationTime","type":"uint64"},{"internalType":"bool","name":"revocable","type":"bool"},{"internalType":"bytes32","name":"refUID","type":"bytes32"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"uint256","name":"value","type":"uint256"}],"internalType":"struct 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AttestationRequestData","name":"data","type":"tuple"},{"components":[{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"internalType":"struct Signature","name":"signature","type":"tuple"},{"internalType":"address","name":"attester","type":"address"},{"internalType":"uint64","name":"deadline","type":"uint64"}],"internalType":"struct DelegatedProxyAttestationRequest","name":"delegatedRequest","type":"tuple"}],"name":"attestByDelegation","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"eip712Domain","outputs":[{"internalType":"bytes1","name":"fields","type":"bytes1"},{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"version","type":"string"},{"internalType":"uint256","name":"chainId","type":"uint256"},{"internalType":"address","name":"verifyingContract","type":"address"},{"internalType":"bytes32","name":"salt","type":"bytes32"},{"internalType":"uint256[]","name":"extensions","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getAttestTypeHash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"bytes32","name":"uid","type":"bytes32"}],"name":"getAttester","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getDomainSeparator","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getEAS","outputs":[{"internalType":"contract IEAS","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getName","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getRevokeTypeHash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"isAttester","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"schema","type":"bytes32"},{"components":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint64","name":"expirationTime","type":"uint64"},{"internalType":"bool","name":"revocable","type":"bool"},{"internalType":"bytes32","name":"refUID","type":"bytes32"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"uint256","name":"value","type":"uint256"}],"internalType":"struct AttestationRequestData[]","name":"data","type":"tuple[]"},{"components":[{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"internalType":"struct Signature[]","name":"signatures","type":"tuple[]"},{"internalType":"address","name":"attester","type":"address"},{"internalType":"uint64","name":"deadline","type":"uint64"}],"internalType":"struct MultiDelegatedProxyAttestationRequest[]","name":"multiDelegatedRequests","type":"tuple[]"}],"name":"multiAttestByDelegation","outputs":[{"internalType":"bytes32[]","name":"","type":"bytes32[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"schema","type":"bytes32"},{"components":[{"internalType":"bytes32","name":"uid","type":"bytes32"},{"internalType":"uint256","name":"value","type":"uint256"}],"internalType":"struct RevocationRequestData[]","name":"data","type":"tuple[]"},{"components":[{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"internalType":"struct Signature[]","name":"signatures","type":"tuple[]"},{"internalType":"address","name":"revoker","type":"address"},{"internalType":"uint64","name":"deadline","type":"uint64"}],"internalType":"struct MultiDelegatedProxyRevocationRequest[]","name":"multiDelegatedRequests","type":"tuple[]"}],"name":"multiRevokeByDelegation","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"schema","type":"bytes32"},{"components":[{"internalType":"bytes32","name":"uid","type":"bytes32"},{"internalType":"uint256","name":"value","type":"uint256"}],"internalType":"struct RevocationRequestData","name":"data","type":"tuple"}],"internalType":"struct RevocationRequest","name":"request","type":"tuple"}],"name":"revoke","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"schema","type":"bytes32"},{"components":[{"internalType":"bytes32","name":"uid","type":"bytes32"},{"internalType":"uint256","name":"value","type":"uint256"}],"internalType":"struct RevocationRequestData","name":"data","type":"tuple"},{"components":[{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"internalType":"struct Signature","name":"signature","type":"tuple"},{"internalType":"address","name":"revoker","type":"address"},{"internalType":"uint64","name":"deadline","type":"uint64"}],"internalType":"struct DelegatedProxyRevocationRequest","name":"delegatedRequest","type":"tuple"}],"name":"revokeByDelegation","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"attester","type":"address"},{"internalType":"bool","name":"enable","type":"bool"}],"name":"toggleAttester","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000c47300428b6ad2c7d03bb76d05a176058b47e6b0
-----Decoded View---------------
Arg [0] : eas (address): 0xC47300428b6AD2c7D03BB76D05A176058b47E6B0
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000c47300428b6ad2c7d03bb76d05a176058b47e6b0
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Multichain Portfolio | 30 Chains
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.