Angular2 Base64 sanitizing unsafe URL value

Question

Response from my server looks like following:

[{"coreGoalId":1,"title":"Core goal 1","infrastructure":"Sample Infrastructure","audience":"People","subGoals":null,"benefits":[{"benefitId":1,"what":"string","coreGoalId":1}],"effects":null,"steps":null,"images":[{"imagelId":1,"base64":"/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcU\nFhYaHSUfGhsjHBYWICwgIyYnKSopGR8tMC0oMCUoKSj/2wBDAQcHBwoIChMKChMoGhYaKCgoKCgo\nKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCj/wgARCAIWAe4DASIA\nAhEBAxEB/8QAHAABAAIDAQEB"}]}]

I am trying to display the base64 image returned in it.

In my component:

ngOnInit() {

    this.homeService.getGoals()
    .subscribe(
        goals => this.coreGoals = goals,
        error =>  this.errorMessage = <any>error);
}

and then in template:

<ul>
    <li *ngFor="let goal of coreGoals">
        {{goal.title}}
        <img [src]="'data:image/jpg;base64,'+goal.images[0].base64 | safeHtml" />
    </li>
</ul>

Where safeHtml is a Pipe I created like following:

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

@Pipe({name: 'safeHtml'})
export class SafeHtml {
  constructor(private sanitizer:DomSanitizer){}

  transform(html) {
    return this.sanitizer.bypassSecurityTrustHtml(html);
  }
}

This gives me Required a safe URL, got a HTML error. What is going wrong here? If I remove the pipe from <img /> then it says unsafe url.

Günter Zöchbauer Günter Zöchbauer · Accepted Answer · 2017-03-31T13:10:38

67

votes

You would need

bypassSecurityTrustResourceUrl(html);

instead of

bypassSecurityTrustHtml(html);

Angular2 Base64 sanitizing unsafe URL value

2 Answers