# All files / modules/notifications/services push-notification.service.ts

100% Statements 82/82
97.14% Branches 34/35
100% Functions 9/9
100% Lines 79/79

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     import {
      Injectable,
      Logger,
      OnModuleInit,
    } from '@nestjs/common';
    import { ConfigService } from '@nestjs/config';
    import { InjectRepository } from '@nestjs/typeorm';
    import { Repository } from 'typeorm';
    import * as webpush from 'web-push';
    import { UserDevice, NotificationLog } from '../entities';

    export interface PushPayload {
      title: string;
      body: string;
      icon?: string;
      badge?: string;
      url?: string;
      data?: Record<string, any>;
      actions?: Array<{ action: string; title: string }>;
    }

    export interface SendResult {
      deviceId: string;
      success: boolean;
      error?: string;
      statusCode?: number;
    }

    @Injectable()
    export class PushNotificationService implements OnModuleInit {
      private readonly logger = new Logger(PushNotificationService.name);
      private isConfigured = false;

      constructor(
        private readonly configService: ConfigService,
        @InjectRepository(UserDevice)
        private readonly deviceRepository: Repository<UserDevice>,
        @InjectRepository(NotificationLog)
        private readonly logRepository: Repository<NotificationLog>,
      ) {}

      onModuleInit() {
        const vapidPublicKey = this.configService.get<string>('VAPID_PUBLIC_KEY');
        const vapidPrivateKey = this.configService.get<string>('VAPID_PRIVATE_KEY');
        const vapidSubject = this.configService.get<string>(
          'VAPID_SUBJECT',
          'mailto:admin@example.com',
        );

        if (vapidPublicKey && vapidPrivateKey) {
          try {
            webpush.setVapidDetails(vapidSubject, vapidPublicKey, vapidPrivateKey);
            this.isConfigured = true;
            this.logger.log('Web Push configured with VAPID keys');
          } catch (error) {
            this.logger.error(`Failed to configure Web Push: ${error.message}`);
          }
        } else {
          this.logger.warn(
            'VAPID keys not configured. Push notifications will be disabled.',
          );
        }
      }

      isEnabled(): boolean {
        return this.isConfigured;
      }

      getVapidPublicKey(): string | null {
        if (!this.isConfigured) {
          return null;
        }
        return this.configService.get<string>('VAPID_PUBLIC_KEY') || null;
      }

      async sendToUser(
        userId: string,
        tenantId: string,
        payload: PushPayload,
        notificationId?: string,
      ): Promise<SendResult[]> {
        if (!this.isConfigured) {
          this.logger.warn('Push notifications not configured, skipping send');
          return [];
        }

        const devices = await this.deviceRepository.find({
          where: { user_id: userId, tenant_id: tenantId, is_active: true },
        });

        if (devices.length === 0) {
          this.logger.debug(`No active devices found for user ${userId}`);
          return [];
        }

        const results: SendResult[] = [];
        const pushPayload = JSON.stringify({
          title: payload.title,
          body: payload.body,
          icon: payload.icon || '/icon-192.png',
          badge: payload.badge || '/badge-72.png',
          url: payload.url || '/',
          data: payload.data,
          actions: payload.actions || [
            { action: 'view', title: 'Ver' },
            { action: 'dismiss', title: 'Descartar' },
          ],
        });

        for (const device of devices) {
          const result = await this.sendToDevice(
            device,
            pushPayload,
            notificationId,
          );
          results.push(result);
        }

        const successCount = results.filter((r) => r.success).length;
        this.logger.log(
          `Push sent to user ${userId}: ${successCount}/${results.length} successful`,
        );

        return results;
      }

      async sendToDevice(
        device: UserDevice,
        payload: string,
        notificationId?: string,
      ): Promise<SendResult> {
        try {
          const subscription = JSON.parse(device.device_token);

          await webpush.sendNotification(subscription, payload);

          // Update last used
          device.last_used_at = new Date();
          await this.deviceRepository.save(device);

          // Log success
          if (notificationId) {
            await this.logRepository.save({
              notification_id: notificationId,
              channel: 'push',
              status: 'sent',
              provider: 'web-push',
              device_id: device.id,
              delivered_at: new Date(),
            });
          }

          return {
            deviceId: device.id,
            success: true,
          };
        } catch (error) {
          const statusCode = error.statusCode;

          // Handle expired subscriptions
          if (statusCode === 410 || statusCode === 404) {
            this.logger.warn(
              `Device ${device.id} subscription expired (${statusCode}), marking inactive`,
            );
            device.is_active = false;
            await this.deviceRepository.save(device);
          }

          // Log failure
          if (notificationId) {
            await this.logRepository.save({
              notification_id: notificationId,
              channel: 'push',
              status: 'failed',
              provider: 'web-push',
              device_id: device.id,
              error_code: statusCode?.toString(),
              error_message: error.message,
            });
          }

          return {
            deviceId: device.id,
            success: false,
            error: error.message,
            statusCode,
          };
        }
      }

      async sendBroadcast(
        tenantId: string,
        payload: PushPayload,
      ): Promise<{ total: number; successful: number; failed: number }> {
        if (!this.isConfigured) {
          this.logger.warn('Push notifications not configured, skipping broadcast');
          return { total: 0, successful: 0, failed: 0 };
        }

        const devices = await this.deviceRepository.find({
          where: { tenant_id: tenantId, is_active: true },
        });

        const pushPayload = JSON.stringify({
          title: payload.title,
          body: payload.body,
          icon: payload.icon || '/icon-192.png',
          badge: payload.badge || '/badge-72.png',
          url: payload.url || '/',
          data: payload.data,
        });

        let successful = 0;
        let failed = 0;

        for (const device of devices) {
          const result = await this.sendToDevice(device, pushPayload);
          if (result.success) {
            successful++;
          } else {
            failed++;
          }
        }

        this.logger.log(
          `Broadcast to tenant ${tenantId}: ${successful}/${devices.length} successful`,
        );

        return {
          total: devices.length,
          successful,
          failed,
        };
      }

      validateSubscription(subscriptionJson: string): boolean {
        try {
          const subscription = JSON.parse(subscriptionJson);

          if (!subscription.endpoint) {
            return false;
          }

          if (!subscription.keys?.p256dh || !subscription.keys?.auth) {
            return false;
          }

          return true;
        } catch {
          return false;
        }
      }
    }