Enterprise n8n Workflow Automation & AI Agents

import { IExecuteFunctions, INodeExecutionData, INodeType, INodeTypeDescription } from 'n8n-workflow';
import crypto from 'crypto';

export class CustomEnterpriseTransformer implements INodeType {
  description: INodeTypeDescription = {
    displayName: 'Enterprise Signature Validator',
    name: 'enterpriseSignatureValidator',
    group: ['transform'],
    version: 1,
    description: 'Validates inbound webhook HMAC signatures against secret vault',
    defaults: { name: 'Signature Validator' },
    inputs: ['main'],
    outputs: ['main'],
    properties: [],
  };

  async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
    const items = this.getInputData();
    const secret = process.env.WEBHOOK_HMAC_SECRET!;

    const validated = items.filter(item => {
      const signature = item.json.headers['x-hub-signature-256'] as string;
      const expected = 'sha256=' + crypto.createHmac('sha256', secret).update(JSON.stringify(item.json.body)).digest('hex');
      return crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected));
    });

    return [validated];
  }
}