feat: webhook signing Nestjs

examples/webhook-signing/nestjs/app.controller.ts

@@ -0,0 +1,72 @@
+// create payment controller
+
+import {
+  Controller,
+  Post,
+  Headers,
+  Get,
+  RawBodyRequest,
+  Req,
+  Res,
+  Injectable,
+  Inject,
+} from '@nestjs/common';
+import {Request, Response} from 'express';
+import Stripe from 'stripe';
+import {ConfigService} from '@nestjs/config';
+
+@Controller()
+export class AppController {
+  private readonly client: Stripe;
+  constructor(@Inject(ConfigService) private readonly config: ConfigService) {
+    this.client = new Stripe(this.config.get('Stripe.secret_key'), {
+      apiVersion: '2022-11-15',
+      typescript: true,
+    });
+  }
+
+  @Get('/')
+  async index(): Promise<string> {
+    return 'ok';
+  }
+
+  @Post('/webhooks')
+  async webhooks(
+    @Headers('stripe-signature') sig: string,
+    @Req() req: RawBodyRequest<Request>,
+    @Res() res: Response
+  ) {
+    let event: Stripe.Event;
+
+    try {
+      event = this.client.webhooks.constructEvent(
+        req.rawBody,
+        sig,
+        this.config.get('Stripe.webhook_secret')
+      );
+    } catch (err) {
+      // On error, log and return the error message
+      console.log(`❌ Error message: ${err.message}`);
+      res.status(400).send(`Webhook Error: ${err.message}`);
+      return;
+    }
+
+    // Successfully constructed event
+    console.log('✅ Success:', event.id);
+
+    // Cast event data to Stripe object
+    if (event.type === 'payment_intent.succeeded') {
+      const stripeObject: Stripe.PaymentIntent = event.data
+        .object as Stripe.PaymentIntent;
+      console.log(`💰 PaymentIntent status: ${stripeObject.status}`);
+    } else if (event.type === 'charge.succeeded') {
+      const charge = event.data.object as Stripe.Charge;
+      console.log(`💵 Charge id: ${charge.id}`);
+    } else {
+      console.warn(`🤷‍♀️ Unhandled event type: ${event.type}`);
+    }
+
+    // Return a response to acknowledge receipt of the event
+    res.status(200).json({received: true});
+  }
+}

examples/webhook-signing/nestjs/app.module.ts

@@ -0,0 +1,16 @@
+import {Module} from '@nestjs/common';
+import {ConfigModule} from '@nestjs/config';
+import {config} from './config';
+import {AppController} from './app.controller';
+
+@Module({
+  controllers: [AppController],
+  imports: [
+    ConfigModule.forRoot({
+      isGlobal: true,
+      load: [config],
+      envFilePath: `.env`,
+    }),
+  ],
+})
+export class AppModule {}

examples/webhook-signing/nestjs/config.ts

@@ -0,0 +1,13 @@
+type Config = {
+  Stripe: {
+    secret_key: string;
+    webhook_secret: string;
+  };
+};
+
+export const config = (): Config => ({
+  Stripe: {
+    secret_key: process.env.STRIPE_SECRET_KEY || '',
+    webhook_secret: process.env.STRIPE_WEBHOOK_SECRET || '',
+  },
+});

examples/webhook-signing/nestjs/main.ts

@@ -0,0 +1,18 @@
+#!/usr/bin/env -S npm run-script run
+
+import {NestFactory} from '@nestjs/core';
+import {INestApplication} from '@nestjs/common';
+import {AppModule} from './app.module';
+
+async function bootstrap() {
+  const app = await NestFactory.create<INestApplication>(AppModule, {
+    rawBody: true,
+  });
+  app.enableCors({
+    origin: '*',
+  });
+
+  await app.listen(0);
+  console.log(`Webhook endpoint available at ${await app.getUrl()}/webhooks`);
+}
+bootstrap();

examples/webhook-signing/nestjs/package.json

@@ -0,0 +1,30 @@
+{
+  "name": "webhook-signing-example-nestjs",
+  "version": "1.0.0",
+  "description": "Nestjs webhook parsing sample",
+  "repository": {},
+  "main": "./main.ts",
+  "scripts": {
+    "run": "ts-node-transpile-only ./main.ts",
+    "prepare": "../prepare.sh"
+  },
+  "author": "Ali karimi",
+  "license": "ISC",
+  "dependencies": {
+    "@nestjs/common": "^10.2.1",
+    "@nestjs/config": "^3.0.0",
+    "@nestjs/core": "^10.2.1",
+    "dotenv": "^16.3.1",
+    "@nestjs/platform-express": "^10.2.1",
+    "reflect-metadata": "^0.1.13",
+    "rxjs": "^7.8.1",
+    "stripe": "^12.18.0"
+  },
+  "devDependencies": {
+    "eslint": "^8.33.0",
+    "@types/node": "^20.5.4",
+    "@types/express": "^4.17.17",
+    "typescript": "^5.2.2",
+    "ts-node": "^10.9.1"
+  }
+}

examples/webhook-signing/tsconfig.json

@@ -10,6 +10,8 @@
 
     /* Advanced Options */
     /* Disallow inconsistently-cased references to the same file. */
-    "forceConsistentCasingInFileNames": true
+    "forceConsistentCasingInFileNames": true,
+
+    "experimentalDecorators": true,
   }
 }

test/Integration.spec.ts

@@ -107,4 +107,13 @@ describe('Integration test', function() {
   });
 
   it('Webhook sample deno', () => runWebhookTest('deno'));
+
+  it('Webhook sample nestjs', function() {
+    // Next.js supports Node.js >=16
+    if (nodeVersion < 16) {
+      this.skip();
+    }
+
+    runWebhookTest('nestjs');
+  });
 });