@opendatalabs/vana-sdk/dist/auth/web3-signed-builder.js

A TypeScript library for interacting with Vana Network smart contracts.

import { sha256 } from "@noble/hashes/sha2";
import { bytesToHex } from "viem";
import { toBase64 } from "../utils/encoding.js";
const EMPTY_BODY_HASH = "sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
const DEFAULT_TTL_SECONDS = 300;
function base64urlEncode(input) {
  return toBase64(input).replace(/\+/g, "-").replace(/\//g, "_").replace(/=+$/, "");
}
function computeBodyHash(body) {
  if (!body || body.length === 0) {
    return EMPTY_BODY_HASH;
  }
  const digest = sha256(body);
  return `sha256:${bytesToHex(digest).slice(2)}`;
}
async function buildWeb3SignedHeader(params) {
  const now = Math.floor(Date.now() / 1e3);
  const iat = params.iat ?? now;
  const exp = params.exp ?? iat + DEFAULT_TTL_SECONDS;
  const payload = {
    aud: params.aud,
    bodyHash: params.bodyHash ?? computeBodyHash(params.body),
    exp,
    iat,
    method: params.method,
    uri: params.uri
  };
  if (params.grantId !== void 0) {
    payload["grantId"] = params.grantId;
  }
  const sortedPayload = Object.keys(payload).sort().reduce((acc, key) => {
    acc[key] = payload[key];
    return acc;
  }, {});
  const payloadJson = JSON.stringify(sortedPayload);
  const payloadBytes = new TextEncoder().encode(payloadJson);
  const payloadBase64 = base64urlEncode(payloadBytes);
  const signature = await params.signMessage(payloadBase64);
  return `Web3Signed ${payloadBase64}.${signature}`;
}
export {
  buildWeb3SignedHeader,
  computeBodyHash
};
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