example of how to use hyperledger fabric permissions

permissions-example.js

'use strict';
const shim = require('fabric-shim');

async function requireRole(stub, role) {
  const ClientIdentity = shim.ClientIdentity;
  let cid = new ClientIdentity(stub);
  if (!cid.assertAttributeValue('role', role))
    throw new Error(`Unauthorized access: ${role} required`);
}

let Chaincode = class {
  async Init(stub) {
    console.info('============= Init called =============');
    return shim.success();
  }

  async Invoke(stub) {
    console.info('============= Invoke called =============');
    try {
      await requireRole(stub, 'admin');
    } catch(err) {
      console.error("Error during Invoke: ", err);
      return shim.error(err.message || err);
    }
    console.info('SUCCESS!')
    return shim.success();
  }
}

shim.start(new Chaincode());