Contract Name:
AttesterProxy
Contract Source Code:
// 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uint64 revocationTime; // The time when the attestation was revoked (Unix timestamp).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 0.8.19;
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,
IEAS,
MultiAttestationRequest,
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 { 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 of the new 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 ^0.8.0;
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
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
// 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/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);
}
}
}
// 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
pragma solidity 0.8.19;
import {
EIP712Proxy,
AttestationRequest,
RevocationRequest,
DelegatedProxyAttestationRequest
} from "@ethereum-attestation-service/eas-contracts/contracts/eip712/proxy/EIP712Proxy.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {AccessDenied} from "@ethereum-attestation-service/eas-contracts/contracts/Common.sol";
import {IEAS, Attestation} from "@ethereum-attestation-service/eas-contracts/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();
}
}
}