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Cover image for How to disable Angular's build-in sanitization for an URL
Adrian Matei for Codever

Posted on • Updated on • Originally published at codever.dev

How to disable Angular's build-in sanitization for an URL

Project: codever - File: backup-bookmarks-dialog.component.ts

On Codever you can backup your bookmarks and snippets. When backing up you are presented a dialog where you can choose to display the items in browser. For that we use a blob URL we know for sure it is safe.

To not get the unsafe prefix in your generated html I use the DomSanitizer and its method bypassSecurityTrustUrl as shown in the example below:

export class BackupBookmarksDialogComponent implements OnInit {

  backupType: string; // 'bookmarks' | 'snippets';
  blobUrl: any;
  sanitizedBlobUrl: any;
  filename: string;

  constructor(
    private dialogRef: MatDialogRef<BackupBookmarksDialogComponent>,
    private router: Router,
    @Inject(MAT_DIALOG_DATA) data,
    private sanitizer: DomSanitizer
  ) {
    this.sanitizedBlobUrl = 
    this.sanitizer.bypassSecurityTrustUrl(data.blobUrl);
    this.blobUrl = data.blobUrl;
    this.backupType = data.backupType;
    const currentDate = new Date();
    this.filename = `${this.backupType}_${currentDate.toISOString()}.json`;
  }
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In the html component the sanitizedBlogUrl is injected in the href attribute of the a html element

  <a [href]="sanitizedBlobUrl" [download]="filename" type="button" class="btn btn-primary btn-sm mr-2" (click)="download()"><i class="fas fa-download"></i> Download
  </a>
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Reference -

https://angular.io/api/platform-browser/DomSanitizer

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Top comments (2)

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ikatsuba profile image
Igor Katsuba

Sorry, but this article should be titled "How to disable Angular's build-in sanitization".

Calling any of the bypassSecurityTrust... APIs disables Angular's built-in sanitization for the value passed in.

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ama profile image
Adrian Matei

Thanks for the tip, it makes sense

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