Identifying and Blocking Users from Accessing External Domains Outside of the Angular Application

Question

Identifying and Blocking Users from Accessing External Domains Outside of the Angular Application

I am working on an angular application and I need to implement a feature where I can detect when a user navigates outside of the app domain from a specific component.

For instance, let's say the user is on the upload component processing important information and decides to navigate away using methods like router, window.location.href, window.location.assign, manually entering a URL, or clicking a link in an advertisement. I want to be able to capture this event in Angular and based on certain conditions, allow or prevent the navigation.

I am aware that we can use the router to detect route changes within the Angular app, but it doesn't cover scenarios like external routing through window.location or from ad popups. Below is the code snippet I tried using the router approach:

this.router.events.forEach((e: any) => {
      if (e instanceof NavigationStart) {
        console.log('routing to ' + JSON.stringify(e));
      }
    });

In essence, my goal is to block all external navigations from one specific component in the app while still allowing internal app routing. Is there a way to achieve this?

javascript angular typescript url-routing angular-routing

Answer 1

Answer №1

If you want to implement a feature triggered by an event, such as beforeunload, you can use the HostListener in Angular. Here is an example:

import { Component, HostListener } from '@angular/core';
import { Router, NavigationStart } from '@angular/router';

@Component({
 selector: 'app-upload',
 templateUrl: './upload.component.html',
 styleUrls: ['./upload.component.css']
})
export class UploadComponent {
  constructor(private router: Router) {
    // Subscribe to Angular Router events
  }

  @HostListener('window:beforeunload', ['$event'])
  unloadNotification($event: any): void {
    // Add your custom logic here to prompt the user before leaving the page
    // For instance, display a confirmation message
    $event.returnValue = true;
  }
}

I hope this code snippet proves useful for your implementation.

For an updated version without popups

import { Component, OnInit } from '@angular/core';
import { Router, NavigationStart } from '@angular/router';

@Component({
  selector: 'app-upload',
  templateUrl: './upload.component.html',
  styleUrls: ['./upload.component.css']
})
export class UploadComponent implements OnInit {

  constructor(private router: Router) { }

  ngOnInit() {
    this.router.events.subscribe((event) => {
      if (event instanceof NavigationStart) {
        // Verify if the new URL belongs to your app's domain
        const isInternalRoute = event.url.startsWith('/your-app-root');

        if (!isInternalRoute) {
          // External navigation detected, take necessary action
          console.warn('External navigation prevented.');
          // Optionally, redirect to a specific route within your app
          this.router.navigate(['/']); // Redirect to home or another route
        }
      }
    });
  }
}

Answer 2

If you want to implement a feature triggered by an event, such as beforeunload, you can use the HostListener in Angular. Here is an example:

import { Component, HostListener } from '@angular/core';
import { Router, NavigationStart } from '@angular/router';

@Component({
 selector: 'app-upload',
 templateUrl: './upload.component.html',
 styleUrls: ['./upload.component.css']
})
export class UploadComponent {
  constructor(private router: Router) {
    // Subscribe to Angular Router events
  }

  @HostListener('window:beforeunload', ['$event'])
  unloadNotification($event: any): void {
    // Add your custom logic here to prompt the user before leaving the page
    // For instance, display a confirmation message
    $event.returnValue = true;
  }
}

I hope this code snippet proves useful for your implementation.

For an updated version without popups

import { Component, OnInit } from '@angular/core';
import { Router, NavigationStart } from '@angular/router';

@Component({
  selector: 'app-upload',
  templateUrl: './upload.component.html',
  styleUrls: ['./upload.component.css']
})
export class UploadComponent implements OnInit {

  constructor(private router: Router) { }

  ngOnInit() {
    this.router.events.subscribe((event) => {
      if (event instanceof NavigationStart) {
        // Verify if the new URL belongs to your app's domain
        const isInternalRoute = event.url.startsWith('/your-app-root');

        if (!isInternalRoute) {
          // External navigation detected, take necessary action
          console.warn('External navigation prevented.');
          // Optionally, redirect to a specific route within your app
          this.router.navigate(['/']); // Redirect to home or another route
        }
      }
    });
  }
}

Identifying and Blocking Users from Accessing External Domains Outside of the Angular Application

Answer №1

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