BE/src/interceptors/logout.interceptor.ts

// refresh-token.interceptor.ts
import {
  Injectable,
  NestInterceptor,
  ExecutionContext,
  CallHandler,
} from '@nestjs/common';
import { Observable, of } from 'rxjs';

@Injectable()
export class LogoutInterceptor implements NestInterceptor {
  intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
    const request = context.switchToHttp().getRequest();
    const response = context.switchToHttp().getResponse();

    const refreshToken = request.cookies?.refresh_token;

    if (!refreshToken) {
      // Send a custom 200 response when refresh token is missing
      response.clearCookie('access_token');
      response.clearCookie('refresh_token');

      response.status(200).json({
        statusCode: 200,
        message: 'Logged-Out successfully',
      });

      // Prevent further handling
      return of(null);
    }

    // Attach refresh token to request object for later use
    request.user = {
      ...(request.user || {}),
      refreshToken,
    };

    return next.handle();
  }
}