Correct Way Provide Domsanitizer To Component With Angular 2 Rc6

Angular 2 RC6 introduced a powerful security feature known as DomSanitizer. This feature allows developers to sanitize untrusted HTML strings for safe use in your Angular application. Ensuring that you're providing DomSanitizer to your components correctly is crucial for protecting your application from potentially harmful content injections. In this article, we will guide you on the correct way to provide DomSanitizer to a component within Angular 2 RC6.

To begin, let's understand why using DomSanitizer is essential. When users input data into forms or when your application fetches content from external sources, there's a risk of receiving malicious scripts or harmful HTML content that can compromise your application's security. DomSanitizer helps mitigate these risks by sanitizing the HTML content and making sure only safe content is rendered.

To provide DomSanitizer to a component in Angular 2 RC6, you need to follow a few simple steps. First, import the DomSanitizer service from '@angular/platform-browser' in your component file. This import statement allows you to access and utilize the DomSanitizer service within your component.

Next, declare the DomSanitizer service as a dependency in the component's constructor. By declaring the DomSanitizer service as a dependency, Angular will inject the service into your component, making it available for use throughout the component.

Once you have injected the DomSanitizer service into your component, you can now utilize its sanitize method to sanitize the HTML content. The sanitize method takes two arguments: the ContextType and the value to be sanitized. The ContextType specifies the type of context in which the HTML content will be used, such as 'html', 'style', 'script', 'url', or 'resourceUrl'.

For example, if you have a variable containing untrusted HTML content that you want to sanitize before displaying it in your component, you can use the DomSanitizer service to sanitize the content. Here's an example code snippet demonstrating how to use the DomSanitizer service:

import { DomSanitizer, SafeHtml } from '@angular/platform-browser';

export class YourComponent {
  constructor(private sanitizer: DomSanitizer) {
    this.untrustedHtml = 'alert("Hello, world!")';
    this.safeHtml: SafeHtml = this.sanitizer.sanitize(SecurityContext.HTML, this.untrustedHtml);
  }
}

In the above code snippet, we first import the DomSanitizer service and the SafeHtml interface. We then declare a variable containing untrusted HTML content and use the DomSanitizer service to sanitize the content using the sanitize method with the 'html' context type.

By following these steps and integrating DomSanitizer into your components correctly, you can enhance the security of your Angular 2 RC6 application and safeguard it against potential security vulnerabilities arising from untrusted HTML content. Remember to always sanitize untrusted content before rendering it in your application to ensure a secure user experience.