@swipewallet/venus-js
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A JavaScript SDK for Ethereum and the Venus Protocol.
185 lines • 8.34 kB
JavaScript
;
// Based on
// https://github.com/ethereum/EIPs/blob/master/assets/eip-712/Example.js
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 __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
exports.__esModule = true;
exports.sign = void 0;
var ethers_1 = require("ethers");
function abiRawEncode(encTypes, encValues) {
var hexStr = ethers_1.ethers.utils.defaultAbiCoder.encode(encTypes, encValues);
return Buffer.from(hexStr.slice(2, hexStr.length), 'hex');
}
function keccak256(arg) {
var hexStr = ethers_1.ethers.utils.keccak256(arg);
return Buffer.from(hexStr.slice(2, hexStr.length), 'hex');
}
// Recursively finds all the dependencies of a type
function dependencies(primaryType, found, types) {
if (found === void 0) { found = []; }
if (types === void 0) { types = {}; }
if (found.includes(primaryType)) {
return found;
}
if (types[primaryType] === undefined) {
return found;
}
found.push(primaryType);
for (var _i = 0, _a = types[primaryType]; _i < _a.length; _i++) {
var field = _a[_i];
for (var _b = 0, _c = dependencies(field.type, found); _b < _c.length; _b++) {
var dep = _c[_b];
if (!found.includes(dep)) {
found.push(dep);
}
}
}
return found;
}
function encodeType(primaryType, types) {
if (types === void 0) { types = {}; }
// Get dependencies primary first, then alphabetical
var deps = dependencies(primaryType);
deps = deps.filter(function (t) { return t != primaryType; });
deps = [primaryType].concat(deps.sort());
// Format as a string with fields
var result = '';
for (var _i = 0, deps_1 = deps; _i < deps_1.length; _i++) {
var type = deps_1[_i];
if (!types[type])
throw new Error("Type '" + type + "' not defined in types (" + JSON.stringify(types) + ")");
result += type + "(" + types[type].map(function (_a) {
var name = _a.name, type = _a.type;
return type + " " + name;
}).join(',') + ")";
}
return result;
}
function typeHash(primaryType, types) {
if (types === void 0) { types = {}; }
return keccak256(Buffer.from(encodeType(primaryType, types)));
}
function encodeData(primaryType, data, types) {
if (types === void 0) { types = {}; }
var encTypes = [];
var encValues = [];
// Add typehash
encTypes.push('bytes32');
encValues.push(typeHash(primaryType, types));
// Add field contents
for (var _i = 0, _a = types[primaryType]; _i < _a.length; _i++) {
var field = _a[_i];
var value = data[field.name];
if (field.type == 'string' || field.type == 'bytes') {
encTypes.push('bytes32');
value = keccak256(Buffer.from(value));
encValues.push(value);
}
else if (types[field.type] !== undefined) {
encTypes.push('bytes32');
value = keccak256(encodeData(field.type, value, types));
encValues.push(value);
}
else if (field.type.lastIndexOf(']') === field.type.length - 1) {
throw 'TODO: Arrays currently unimplemented in encodeData';
}
else {
encTypes.push(field.type);
encValues.push(value);
}
}
return abiRawEncode(encTypes, encValues);
}
function domainSeparator(domain) {
var types = {
EIP712Domain: [
{ name: 'name', type: 'string' },
{ name: 'version', type: 'string' },
{ name: 'chainId', type: 'uint256' },
{ name: 'verifyingContract', type: 'address' },
{ name: 'salt', type: 'bytes32' }
].filter(function (a) { return domain[a.name]; })
};
return keccak256(encodeData('EIP712Domain', domain, types));
}
function structHash(primaryType, data, types) {
if (types === void 0) { types = {}; }
return keccak256(encodeData(primaryType, data, types));
}
function digestToSign(domain, primaryType, message, types) {
if (types === void 0) { types = {}; }
return keccak256(Buffer.concat([
Buffer.from('1901', 'hex'),
domainSeparator(domain),
structHash(primaryType, message, types),
]));
}
function sign(domain, primaryType, message, types, signer) {
return __awaiter(this, void 0, void 0, function () {
var signature, digest, address, msgParams, r, s, v, e_1;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
_a.trys.push([0, 5, , 6]);
if (!signer._signingKey) return [3 /*break*/, 1];
digest = digestToSign(domain, primaryType, message, types);
signature = signer._signingKey().signDigest(digest);
signature.v = '0x' + (signature.v).toString(16);
return [3 /*break*/, 4];
case 1: return [4 /*yield*/, signer.getAddress()];
case 2:
address = _a.sent();
msgParams = JSON.stringify({ domain: domain, primaryType: primaryType, message: message, types: types });
return [4 /*yield*/, signer.provider.jsonRpcFetchFunc('eth_signTypedData_v4', [address, msgParams])];
case 3:
signature = _a.sent();
r = '0x' + signature.substring(2).substring(0, 64);
s = '0x' + signature.substring(2).substring(64, 128);
v = '0x' + signature.substring(2).substring(128, 130);
signature = { r: r, s: s, v: v };
_a.label = 4;
case 4: return [3 /*break*/, 6];
case 5:
e_1 = _a.sent();
throw new Error(e_1);
case 6: return [2 /*return*/, signature];
}
});
});
}
exports.sign = sign;
//# sourceMappingURL=EIP712.js.map