Initial commit with translated description

scripts/shared/attestation.js

@@ -0,0 +1,85 @@
+const { ethers } = require("ethers");
+const { DID } = require("@iden3/js-iden3-core");
+
+const ATTESTATION_SCHEMA_ID =
+  "0xca354bee6dc5eded165461d15ccb13aceb6f77ebbb1fd3fe45aca686097f2911"; // bytes32
+
+const ATTESTER_DID = ""; // string
+const ATTESTER_IDEN3_ID = 0n; // uint256
+const ATTESTER_ETH_ADDRESS = "0x0000000000000000000000000000000000000000"; // address
+
+const EXPIRATION_TIME = 0n; // uint256 — 0 means no expiration
+const REVOCABLE = false; // bool
+const REF_ID =
+  "0x0000000000000000000000000000000000000000000000000000000000000000"; // bytes32
+const DATA = "0x"; // bytes
+
+function extractIdFromDid(did) {
+  return DID.idFromDID(DID.parse(did)).bigInt();
+}
+
+function buildJsonAttestation(req) {
+  return {
+    schemaId: ATTESTATION_SCHEMA_ID,
+    attester: {
+      did: ATTESTER_DID,
+      iden3Id: ATTESTER_IDEN3_ID.toString(),
+      ethereumAddress: ATTESTER_ETH_ADDRESS,
+    },
+    recipient: {
+      did: req.recipientDid,
+      iden3Id: extractIdFromDid(req.recipientDid).toString(),
+      ethereumAddress: req.recipientEthAddress,
+    },
+    expirationTime: EXPIRATION_TIME.toString(),
+    revocable: REVOCABLE,
+    refId: REF_ID,
+    data: DATA,
+  };
+}
+
+function buildEncodedAttestation(req) {
+  const encoded = ethers.AbiCoder.defaultAbiCoder().encode(
+    [
+      "bytes32", // schemaId
+      "string", // attester.did
+      "uint256", // attester.iden3Id
+      "address", // attester.ethereumAddress
+      "string", // recipient.did
+      "uint256", // recipient.iden3Id
+      "address", // recipient.ethereumAddress
+      "uint256", // expirationTime
+      "bool", // revocable
+      "bytes32", // refId
+      "bytes", // data
+    ],
+    [
+      ATTESTATION_SCHEMA_ID,
+      ATTESTER_DID,
+      ATTESTER_IDEN3_ID,
+      ATTESTER_ETH_ADDRESS,
+      req.recipientDid,
+      extractIdFromDid(req.recipientDid),
+      req.recipientEthAddress,
+      EXPIRATION_TIME,
+      REVOCABLE,
+      REF_ID,
+      DATA,
+    ],
+  );
+  return encoded;
+}
+
+function computeAttestationHash(req) {
+  const hashHex = ethers.keccak256(buildEncodedAttestation(req));
+  return (
+    BigInt(hashHex) &
+    BigInt("0x0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF")
+  ).toString();
+}
+
+module.exports = {
+  buildEncodedAttestation,
+  computeAttestationHash,
+  buildJsonAttestation,
+};