All files / src/platform/webhooks webhook-hub.service.ts

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import { Injectable, Logger } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { WebhookEndpoint, WebhookDelivery } from './schemas/webhook.schema';
import * as crypto from 'crypto';
import * as https from 'https';
import * as http from 'http';
 
@Injectable()
export class WebhookHubService {
  private readonly logger = new Logger(WebhookHubService.name);
 
  constructor(
    @InjectModel(WebhookEndpoint.name)
    private readonly endpointModel: Model<WebhookEndpoint>,
    @InjectModel(WebhookDelivery.name)
    private readonly deliveryModel: Model<WebhookDelivery>,
  ) {}
 
  async registerEndpoint(
    tenantId: string,
    url: string,
    subscribedEvents: string[],
  ): Promise<WebhookEndpoint> {
    const secret = `whsec_${crypto.randomBytes(24).toString('hex')}`;
    return this.endpointModel.create({
      tenantId,
      url,
      subscribedEvents,
      secret,
    });
  }
 
  async triggerEvent(
    tenantId: string,
    event: string,
    payload: Record<string, any>,
  ): Promise<void> {
    const endpoints = await this.endpointModel
      .find({ tenantId, subscribedEvents: event, isActive: true })
      .exec();
 
    for (const ep of endpoints) {
      const delivery = await this.deliveryModel.create({
        tenantId,
        endpointId: (ep as any)._id.toString(),
        event,
        payload,
        status: 'pending',
      });
 
      // Execute background request
      this.dispatchOutbound(ep, delivery);
    }
  }
 
  private dispatchOutbound(
    ep: WebhookEndpoint,
    delivery: WebhookDelivery,
  ): void {
    const bodyStr = JSON.stringify({
      event: delivery.event,
      timestamp: new Date(),
      payload: delivery.payload,
    });
 
    const signature = crypto
      .createHmac('sha256', ep.secret)
      .update(bodyStr)
      .digest('hex');
    const parsedUrl = new URL(ep.url);
 
    const reqOptions = {
      method: 'POST',
      hostname: parsedUrl.hostname,
      port: parsedUrl.port || (parsedUrl.protocol === 'https:' ? 443 : 80),
      path: parsedUrl.pathname + parsedUrl.search,
      headers: {
        'Content-Type': 'application/json',
        'X-BeVision-Signature': signature,
        'Content-Length': Buffer.byteLength(bodyStr),
      },
      timeout: 5000,
    };
 
    const requestModule = parsedUrl.protocol === 'https:' ? https : http;
    const req = requestModule.request(reqOptions, (res) => {
      let responseBody = '';
      res.on('data', (chunk) => (responseBody += chunk));
      res.on('end', async () => {
        const isSuccess =
          res.statusCode && res.statusCode >= 200 && res.statusCode < 300;
 
        await this.deliveryModel.findByIdAndUpdate(delivery._id, {
          status: isSuccess ? 'success' : 'failed',
          $push: {
            attempts: {
              timestamp: new Date(),
              statusCode: res.statusCode || 500,
              responseBody,
            },
          },
        });
      });
    });
 
    req.on('error', async (err) => {
      await this.deliveryModel.findByIdAndUpdate(delivery._id, {
        status: 'failed',
        $push: {
          attempts: {
            timestamp: new Date(),
            statusCode: 500,
            responseBody: '',
            errorMessage: err.message,
          },
        },
      });
    });
 
    req.write(bodyStr);
    req.end();
  }
 
  async verifyInboundSignature(
    payload: string,
    signature: string,
    secret: string,
  ): Promise<boolean> {
    const calculatedSig = crypto
      .createHmac('sha256', secret)
      .update(payload)
      .digest('hex');
    return calculatedSig === signature;
  }
}