86 lines
2.2 KiB
JavaScript
86 lines
2.2 KiB
JavaScript
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const { ethers } = require("ethers");
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const { DID } = require("@iden3/js-iden3-core");
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const ATTESTATION_SCHEMA_ID =
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"0xca354bee6dc5eded165461d15ccb13aceb6f77ebbb1fd3fe45aca686097f2911"; // bytes32
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const ATTESTER_DID = ""; // string
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const ATTESTER_IDEN3_ID = 0n; // uint256
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const ATTESTER_ETH_ADDRESS = "0x0000000000000000000000000000000000000000"; // address
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const EXPIRATION_TIME = 0n; // uint256 — 0 means no expiration
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const REVOCABLE = false; // bool
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const REF_ID =
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"0x0000000000000000000000000000000000000000000000000000000000000000"; // bytes32
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const DATA = "0x"; // bytes
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function extractIdFromDid(did) {
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return DID.idFromDID(DID.parse(did)).bigInt();
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}
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function buildJsonAttestation(req) {
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return {
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schemaId: ATTESTATION_SCHEMA_ID,
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attester: {
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did: ATTESTER_DID,
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iden3Id: ATTESTER_IDEN3_ID.toString(),
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ethereumAddress: ATTESTER_ETH_ADDRESS,
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},
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recipient: {
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did: req.recipientDid,
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iden3Id: extractIdFromDid(req.recipientDid).toString(),
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ethereumAddress: req.recipientEthAddress,
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},
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expirationTime: EXPIRATION_TIME.toString(),
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revocable: REVOCABLE,
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refId: REF_ID,
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data: DATA,
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};
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}
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function buildEncodedAttestation(req) {
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const encoded = ethers.AbiCoder.defaultAbiCoder().encode(
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[
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"bytes32", // schemaId
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"string", // attester.did
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"uint256", // attester.iden3Id
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"address", // attester.ethereumAddress
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"string", // recipient.did
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"uint256", // recipient.iden3Id
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"address", // recipient.ethereumAddress
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"uint256", // expirationTime
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"bool", // revocable
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"bytes32", // refId
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"bytes", // data
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],
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[
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ATTESTATION_SCHEMA_ID,
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ATTESTER_DID,
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ATTESTER_IDEN3_ID,
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ATTESTER_ETH_ADDRESS,
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req.recipientDid,
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extractIdFromDid(req.recipientDid),
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req.recipientEthAddress,
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EXPIRATION_TIME,
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REVOCABLE,
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REF_ID,
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DATA,
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],
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);
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return encoded;
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}
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function computeAttestationHash(req) {
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const hashHex = ethers.keccak256(buildEncodedAttestation(req));
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return (
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BigInt(hashHex) &
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BigInt("0x0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF")
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).toString();
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}
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module.exports = {
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buildEncodedAttestation,
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computeAttestationHash,
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buildJsonAttestation,
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};
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