Angular2 Pipe: DOM seguro

domseguro.pipe.ts

import { Pipe, PipeTransform } from '@angular/core';
import { DomSanitizer  } from '@angular/platform-browser';


@Pipe({
  name: 'domseguro'
})
export class DomseguroPipe implements PipeTransform {

  constructor( private domSanitizer:DomSanitizer ){ }

  transform( value: string, url: string): any {
    return this.domSanitizer.bypassSecurityTrustResourceUrl( url + value );
  }

}

widget.component.ts

<iframe [src]=" pista.uri | domseguro:'https://embed.spotify.com/?uri='" width="300" height="80" frameborder="0" allowtransparency="true"></iframe>