@tokenlon/contracts-lib
Version:
Common utility functions (e.g., signing order, encoding data) to interact with [Tokenlon contracts](https://github.com/consenlabs/tokenlon-contracts).
65 lines • 2.94 kB
JavaScript
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.SigningHelper = void 0;
const crypto_1 = __importDefault(require("crypto"));
const ethers_1 = require("ethers");
const hash_1 = require("@ethersproject/hash");
class SigningHelper {
constructor(options) {
this.name = options.name;
this.version = options.version;
}
generateRandomSalt() {
const randomBytes = crypto_1.default.randomBytes(32);
return ethers_1.BigNumber.from(randomBytes);
}
getEIP712Domain(options) {
return __awaiter(this, void 0, void 0, function* () {
return {
name: this.name,
version: this.version,
chainId: options.chainId,
verifyingContract: options.verifyingContract,
};
});
}
// Reference: https://eips.ethereum.org/EIPS/eip-712#specification
// "\x19\x01" ‖ hashStruct(domain) ‖ hashStruct(types, value)
getEIP712Digest(domain, types, value) {
return hash_1._TypedDataEncoder.hash(domain, types, value);
}
// Reference: https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct
// keccak256(keccak256(encodeType(types[name]) ‖ encodeData(value))
getEIP712StructHash(name, types, value) {
return hash_1._TypedDataEncoder.hashStruct(name, types, value);
}
signEIP712(types, value, options) {
return __awaiter(this, void 0, void 0, function* () {
const domain = yield this.getEIP712Domain({
chainId: yield options.signer.getChainId(),
verifyingContract: options.verifyingContract,
});
const signature = yield options.signer._signTypedData(domain, types, value);
const signatureComposed = this.composeSignature(signature, options.type);
return signatureComposed;
});
}
composeSignature(signature, type) {
const paddedNonce = "00".repeat(32);
return signature + paddedNonce + type;
}
}
exports.SigningHelper = SigningHelper;
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