All files / src/common/interceptors audit.interceptor.ts

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import { CallHandler, ExecutionContext, Injectable, NestInterceptor, Logger } from '@nestjs/common';
import { Reflector } from '@nestjs/core';
import { Observable, tap } from 'rxjs';
import { AUDITED_KEY } from '@app/common/decorators/audited.decorator';
import { PrismaService } from '@app/modules/prisma/prisma.service';
 
@Injectable()
export class AuditInterceptor implements NestInterceptor {
  private readonly logger = new Logger(AuditInterceptor.name);
  constructor(private readonly reflector: Reflector, private readonly prisma: PrismaService) {}
 
  intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
    const action = this.reflector.get<string>(AUDITED_KEY, context.getHandler());
    if (!action) return next.handle();
 
    const req = context.switchToHttp().getRequest();
    const user = req?.user;
    const entityType = req?.route?.path || 'Unknown';
    const oldValue = { body: req?.body, params: req?.params };
 
    return next.handle().pipe(
      tap(async (result) => {
        try {
          // @ts-ignore – generated after prisma generate
          await this.prisma.client.auditLog.create({
            data: {
              entityType,
              entityId: 0,
              action,
              oldValue: oldValue as any,
              newValue: result as any,
              userId: user?.userId ?? user?.id ?? null,
            },
          });
        } catch (e: any) {
          this.logger.warn(`Audit log failed: ${e?.message || e}`);
        }
      }),
    );
  }
}