@zkp2p/reclaim-witness-sdk
Version:
<div> <div> <img src="https://raw.githubusercontent.com/reclaimprotocol/.github/main/assets/banners/Attestor-Core.png" /> </div> </div>
112 lines • 7.88 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.createSignDataForClaim = createSignDataForClaim;
exports.assertValidClaimSignatures = assertValidClaimSignatures;
exports.getIdentifierFromClaimInfo = getIdentifierFromClaimInfo;
exports.canonicalStringify = canonicalStringify;
exports.hashProviderParams = hashProviderParams;
const tls_1 = require("@reclaimprotocol/tls");
const canonicalize_1 = __importDefault(require("canonicalize"));
const ethers_1 = require("ethers");
const config_1 = require("../config");
const api_1 = require("../proto/api");
const signatures_1 = require("../utils/signatures");
/**
* Creates the standard string to sign for a claim.
* This data is what the attestor will sign when it successfully
* verifies a claim.
*/
function createSignDataForClaim(data) {
const identifier = 'identifier' in data
? data.identifier
: getIdentifierFromClaimInfo(data);
const lines = [
identifier,
// we lowercase the owner to ensure that the
// ETH addresses always serialize the same way
data.owner.toLowerCase(),
data.timestampS.toString(),
data.epoch.toString(),
];
return lines.join('\n');
}
/**
* Verify the claim tunnel response from a attestor.
*
* If you'd only like to verify the claim signature, you can
* optionally only pass "claim" & "signatures.claimSignature"
* to this function.
*
* The successful run of this function means that the claim
* is valid, and the attestor that signed the claim is valid.
*/
async function assertValidClaimSignatures({ signatures, ...res }, metadata = config_1.DEFAULT_METADATA) {
if (!signatures) {
throw new Error('No signatures provided');
}
const { resultSignature, claimSignature, attestorAddress } = signatures;
const { verify } = signatures_1.SIGNATURES[metadata.signatureType];
if (signatures === null || signatures === void 0 ? void 0 : signatures.resultSignature) {
const resBytes = api_1.ClaimTunnelResponse.encode(api_1.ClaimTunnelResponse.create(res)).finish();
const verified = await verify(resBytes, resultSignature, attestorAddress);
if (!verified) {
throw new Error('Invalid result signature');
}
}
// claim wasn't generated -- i.e. the transcript
// did not contain the necessary data
if (!res.claim) {
return;
}
const signData = createSignDataForClaim(res.claim);
const verifiedClaim = await verify((0, tls_1.strToUint8Array)(signData), claimSignature, attestorAddress);
if (!verifiedClaim) {
throw new Error('Invalid claim signature');
}
}
/**
* Generates a unique identifier for given claim info
* @param info
* @returns
*/
function getIdentifierFromClaimInfo(info) {
var _a;
//re-canonicalize context if it's not empty
if (((_a = info.context) === null || _a === void 0 ? void 0 : _a.length) > 0) {
try {
const ctx = JSON.parse(info.context);
info.context = canonicalStringify(ctx);
}
catch (e) {
throw new Error('unable to parse non-empty context. Must be JSON');
}
}
const str = `${info.provider}\n${info.parameters}\n${info.context || ''}`;
//console.log('Identifier: ' + btoa(str))
return ethers_1.utils.keccak256((0, tls_1.strToUint8Array)(str)).toLowerCase();
}
/**
* Canonically stringifies an object, so that the same object will always
* produce the same string despite the order of keys
*/
function canonicalStringify(params) {
if (!params) {
return '';
}
return (0, canonicalize_1.default)(params) || '';
}
function hashProviderParams(params) {
const filteredParams = {
url: params.url,
method: params.method,
body: params.body,
responseMatches: params.responseMatches,
responseRedactions: params.responseRedactions
};
const serializedParams = canonicalStringify(filteredParams);
return ethers_1.utils.keccak256((0, tls_1.strToUint8Array)(serializedParams)).toLowerCase();
}
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