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import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { InjectQueue } from '@nestjs/bullmq';
import { Queue } from 'bullmq';
import * as crypto from 'crypto';
import { WebhookEntity, WebhookDeliveryEntity, DeliveryStatus } from '../entities';
import {
CreateWebhookDto,
UpdateWebhookDto,
WebhookResponseDto,
DeliveryResponseDto,
TestWebhookDto,
ListDeliveriesQueryDto,
PaginatedDeliveriesDto,
WebhookStatsDto,
WEBHOOK_EVENTS,
} from '../dto';
@Injectable()
export class WebhookService {
private readonly logger = new Logger(WebhookService.name);
constructor(
@InjectRepository(WebhookEntity)
private readonly webhookRepo: Repository<WebhookEntity>,
@InjectRepository(WebhookDeliveryEntity)
private readonly deliveryRepo: Repository<WebhookDeliveryEntity>,
@InjectQueue('webhooks')
private readonly webhookQueue: Queue,
) {}
// Generate a secure random secret
private generateSecret(): string {
return `whsec_${crypto.randomBytes(32).toString('hex')}`;
}
// Sign a payload with HMAC-SHA256
signPayload(payload: object, secret: string): string {
const timestamp = Date.now();
const body = JSON.stringify(payload);
const signature = crypto
.createHmac('sha256', secret)
.update(`${timestamp}.${body}`)
.digest('hex');
return `t=${timestamp},v1=${signature}`;
}
// Create a new webhook
async create(tenantId: string, userId: string, dto: CreateWebhookDto): Promise<WebhookResponseDto> {
// Validate events
const invalidEvents = dto.events.filter((e) => !WEBHOOK_EVENTS.includes(e as any));
if (invalidEvents.length > 0) {
throw new BadRequestException(`Invalid events: ${invalidEvents.join(', ')}`);
}
const webhook = this.webhookRepo.create({
tenantId,
name: dto.name,
description: dto.description,
url: dto.url,
events: dto.events,
headers: dto.headers || {},
secret: this.generateSecret(),
createdBy: userId,
});
const saved = await this.webhookRepo.save(webhook);
this.logger.log(`Webhook created: ${saved.id} for tenant ${tenantId}`);
return this.toResponse(saved, true); // Include secret on creation
}
// Get all webhooks for a tenant
async findAll(tenantId: string): Promise<WebhookResponseDto[]> {
const webhooks = await this.webhookRepo.find({
where: { tenantId },
order: { createdAt: 'DESC' },
});
return Promise.all(webhooks.map((w) => this.toResponse(w)));
}
// Get a single webhook
async findOne(tenantId: string, webhookId: string): Promise<WebhookResponseDto> {
const webhook = await this.webhookRepo.findOne({
where: { id: webhookId, tenantId },
});
if (!webhook) {
throw new NotFoundException('Webhook not found');
}
return this.toResponse(webhook);
}
// Update a webhook
async update(
tenantId: string,
webhookId: string,
dto: UpdateWebhookDto,
): Promise<WebhookResponseDto> {
const webhook = await this.webhookRepo.findOne({
where: { id: webhookId, tenantId },
});
if (!webhook) {
throw new NotFoundException('Webhook not found');
}
// Validate events if provided
if (dto.events) {
const invalidEvents = dto.events.filter((e) => !WEBHOOK_EVENTS.includes(e as any));
if (invalidEvents.length > 0) {
throw new BadRequestException(`Invalid events: ${invalidEvents.join(', ')}`);
}
}
Object.assign(webhook, {
name: dto.name ?? webhook.name,
description: dto.description ?? webhook.description,
url: dto.url ?? webhook.url,
events: dto.events ?? webhook.events,
headers: dto.headers ?? webhook.headers,
isActive: dto.isActive ?? webhook.isActive,
});
const saved = await this.webhookRepo.save(webhook);
this.logger.log(`Webhook updated: ${saved.id}`);
return this.toResponse(saved);
}
// Delete a webhook
async remove(tenantId: string, webhookId: string): Promise<void> {
const webhook = await this.webhookRepo.findOne({
where: { id: webhookId, tenantId },
});
if (!webhook) {
throw new NotFoundException('Webhook not found');
}
await this.webhookRepo.remove(webhook);
this.logger.log(`Webhook deleted: ${webhookId}`);
}
// Regenerate webhook secret
async regenerateSecret(tenantId: string, webhookId: string): Promise<{ secret: string }> {
const webhook = await this.webhookRepo.findOne({
where: { id: webhookId, tenantId },
});
if (!webhook) {
throw new NotFoundException('Webhook not found');
}
webhook.secret = this.generateSecret();
await this.webhookRepo.save(webhook);
return { secret: webhook.secret };
}
// Test a webhook
async testWebhook(
tenantId: string,
webhookId: string,
dto: TestWebhookDto,
): Promise<DeliveryResponseDto> {
const webhook = await this.webhookRepo.findOne({
where: { id: webhookId, tenantId },
});
Iif (!webhook) {
throw new NotFoundException('Webhook not found');
}
const eventType = dto.eventType || 'test.ping';
const payload = dto.payload || {
type: 'test.ping',
timestamp: new Date().toISOString(),
data: { message: 'This is a test webhook delivery' },
};
// Create a delivery record
const delivery = this.deliveryRepo.create({
webhookId: webhook.id,
tenantId,
eventType,
payload,
status: DeliveryStatus.PENDING,
});
const saved = await this.deliveryRepo.save(delivery);
// Queue for immediate delivery
await this.webhookQueue.add(
'deliver',
{
deliveryId: saved.id,
webhookId: webhook.id,
url: webhook.url,
secret: webhook.secret,
headers: webhook.headers,
eventType,
payload,
},
{ priority: 1 }, // High priority for tests
);
this.logger.log(`Test webhook queued: ${saved.id}`);
return this.toDeliveryResponse(saved);
}
// Get deliveries for a webhook
async getDeliveries(
tenantId: string,
webhookId: string,
query: ListDeliveriesQueryDto,
): Promise<PaginatedDeliveriesDto> {
const webhook = await this.webhookRepo.findOne({
where: { id: webhookId, tenantId },
});
if (!webhook) {
throw new NotFoundException('Webhook not found');
}
const page = query.page || 1;
const limit = Math.min(query.limit || 20, 100);
const skip = (page - 1) * limit;
const qb = this.deliveryRepo
.createQueryBuilder('d')
.where('d.webhook_id = :webhookId', { webhookId })
.andWhere('d.tenant_id = :tenantId', { tenantId });
if (query.status) {
qb.andWhere('d.status = :status', { status: query.status });
}
Iif (query.eventType) {
qb.andWhere('d.event_type = :eventType', { eventType: query.eventType });
}
qb.orderBy('d.created_at', 'DESC').skip(skip).take(limit);
const [items, total] = await qb.getManyAndCount();
return {
items: items.map((d) => this.toDeliveryResponse(d)),
total,
page,
limit,
totalPages: Math.ceil(total / limit),
};
}
// Retry a failed delivery
async retryDelivery(
tenantId: string,
webhookId: string,
deliveryId: string,
): Promise<DeliveryResponseDto> {
const delivery = await this.deliveryRepo.findOne({
where: { id: deliveryId, webhookId, tenantId },
relations: ['webhook'],
});
if (!delivery) {
throw new NotFoundException('Delivery not found');
}
if (delivery.status !== DeliveryStatus.FAILED) {
throw new BadRequestException('Only failed deliveries can be retried');
}
// Reset for retry
delivery.status = DeliveryStatus.RETRYING;
delivery.attempt = 1;
delivery.nextRetryAt = new Date();
await this.deliveryRepo.save(delivery);
// Queue for delivery
await this.webhookQueue.add('deliver', {
deliveryId: delivery.id,
webhookId: delivery.webhookId,
url: delivery.webhook.url,
secret: delivery.webhook.secret,
headers: delivery.webhook.headers,
eventType: delivery.eventType,
payload: delivery.payload,
});
this.logger.log(`Delivery retry queued: ${delivery.id}`);
return this.toDeliveryResponse(delivery);
}
// Get webhook stats
async getStats(webhookId: string): Promise<WebhookStatsDto> {
const result = await this.deliveryRepo
.createQueryBuilder('d')
.select([
'COUNT(*)::int as "totalDeliveries"',
'COUNT(*) FILTER (WHERE d.status = :delivered)::int as "successfulDeliveries"',
'COUNT(*) FILTER (WHERE d.status = :failed)::int as "failedDeliveries"',
'COUNT(*) FILTER (WHERE d.status IN (:...pending))::int as "pendingDeliveries"',
'MAX(d.delivered_at) as "lastDeliveryAt"',
])
.where('d.webhook_id = :webhookId', { webhookId })
.setParameters({
delivered: DeliveryStatus.DELIVERED,
failed: DeliveryStatus.FAILED,
pending: [DeliveryStatus.PENDING, DeliveryStatus.RETRYING],
})
.getRawOne();
const total = result.successfulDeliveries + result.failedDeliveries;
const successRate = total > 0 ? Math.round((result.successfulDeliveries / total) * 100) : 0;
return {
...result,
successRate,
};
}
// Dispatch an event to all subscribed webhooks
async dispatch(tenantId: string, eventType: string, data: Record<string, any>): Promise<void> {
const webhooks = await this.webhookRepo.find({
where: { tenantId, isActive: true },
});
const subscribedWebhooks = webhooks.filter((w) => w.events.includes(eventType));
if (subscribedWebhooks.length === 0) {
return;
}
const payload = {
type: eventType,
timestamp: new Date().toISOString(),
data,
};
for (const webhook of subscribedWebhooks) {
const delivery = this.deliveryRepo.create({
webhookId: webhook.id,
tenantId,
eventType,
payload,
status: DeliveryStatus.PENDING,
});
const saved = await this.deliveryRepo.save(delivery);
await this.webhookQueue.add('deliver', {
deliveryId: saved.id,
webhookId: webhook.id,
url: webhook.url,
secret: webhook.secret,
headers: webhook.headers,
eventType,
payload,
});
}
this.logger.log(
`Event ${eventType} dispatched to ${subscribedWebhooks.length} webhooks for tenant ${tenantId}`,
);
}
// Get available events
getAvailableEvents(): { name: string; description: string }[] {
return [
{ name: 'user.created', description: 'A new user was created' },
{ name: 'user.updated', description: 'A user was updated' },
{ name: 'user.deleted', description: 'A user was deleted' },
{ name: 'subscription.created', description: 'A new subscription was created' },
{ name: 'subscription.updated', description: 'A subscription was updated' },
{ name: 'subscription.cancelled', description: 'A subscription was cancelled' },
{ name: 'invoice.paid', description: 'An invoice was paid' },
{ name: 'invoice.failed', description: 'An invoice payment failed' },
{ name: 'file.uploaded', description: 'A file was uploaded' },
{ name: 'file.deleted', description: 'A file was deleted' },
{ name: 'tenant.updated', description: 'Tenant settings were updated' },
];
}
// Transform entity to response DTO
private async toResponse(webhook: WebhookEntity, includeSecret = false): Promise<WebhookResponseDto> {
const stats = await this.getStats(webhook.id);
return {
id: webhook.id,
name: webhook.name,
description: webhook.description,
url: webhook.url,
events: webhook.events,
headers: webhook.headers,
isActive: webhook.isActive,
createdAt: webhook.createdAt,
updatedAt: webhook.updatedAt,
...(includeSecret && { secret: webhook.secret }),
stats,
};
}
private toDeliveryResponse(delivery: WebhookDeliveryEntity): DeliveryResponseDto {
return {
id: delivery.id,
webhookId: delivery.webhookId,
eventType: delivery.eventType,
payload: delivery.payload,
status: delivery.status,
responseStatus: delivery.responseStatus,
responseBody: delivery.responseBody,
attempt: delivery.attempt,
maxAttempts: delivery.maxAttempts,
nextRetryAt: delivery.nextRetryAt,
lastError: delivery.lastError,
createdAt: delivery.createdAt,
deliveredAt: delivery.deliveredAt,
};
}
}
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