How does Angular's bypassSecurityTrustHtml pipe work under the hood?
I've used variations of SafeHtml pipe, but I'm wondering how it actually works under the hood. How does Angular know that the text being applied to the DOM has been passed through a pipe and is safe? Is it simply done at the compilation stage or is it a run-time check?
The documentation says:
Calling any of the bypassSecurityTrust... APIs disables Angular's
built-in sanitization for the value passed in
Common implementation of a safe HTML pipe:
import { Pipe, PipeTransform } from '@angular/core';
import { DomSanitizer, SafeHtml } from '@angular/platform-browser';
@Pipe({name: 'sanitizeHtml'})
export class SanitizeHtmlPipe implements PipeTransform {
constructor(private _sanitizer:DomSanitizer) {
}
transform(v:string):SafeHtml {
return this._sanitizer.bypassSecurityTrustHtml(v);
}
}
Update: Figured it out from the dom_sanitization_service.ts source. The bypassSecurityTrustHtml function returns a new SafeHtmlImpl(value); instance. During the sanitize process, there is a check: if (value instanceof SafeHtmlImpl), and if so, the sanitization process is skipped
angular
asked Nov 18 '18 at 22:11
DrenaiDrenai
3,44043153
add a comment |
I've used variations of SafeHtml pipe, but I'm wondering how it actually works under the hood. How does Angular know that the text being applied to the DOM has been passed through a pipe and is safe? Is it simply done at the compilation stage or is it a run-time check?
The documentation says:
Calling any of the bypassSecurityTrust... APIs disables Angular's
built-in sanitization for the value passed in
Common implementation of a safe HTML pipe:
import { Pipe, PipeTransform } from '@angular/core';
import { DomSanitizer, SafeHtml } from '@angular/platform-browser';
@Pipe({name: 'sanitizeHtml'})
export class SanitizeHtmlPipe implements PipeTransform {
constructor(private _sanitizer:DomSanitizer) {
}
transform(v:string):SafeHtml {
return this._sanitizer.bypassSecurityTrustHtml(v);
}
}
Update: Figured it out from the dom_sanitization_service.ts source. The bypassSecurityTrustHtml function returns a new SafeHtmlImpl(value); instance. During the sanitize process, there is a check: if (value instanceof SafeHtmlImpl), and if so, the sanitization process is skipped
angular
asked Nov 18 '18 at 22:11
DrenaiDrenai
3,44043153
add a comment |
I've used variations of SafeHtml pipe, but I'm wondering how it actually works under the hood. How does Angular know that the text being applied to the DOM has been passed through a pipe and is safe? Is it simply done at the compilation stage or is it a run-time check?
The documentation says:
Calling any of the bypassSecurityTrust... APIs disables Angular's
built-in sanitization for the value passed in
Common implementation of a safe HTML pipe:
import { Pipe, PipeTransform } from '@angular/core';
import { DomSanitizer, SafeHtml } from '@angular/platform-browser';
@Pipe({name: 'sanitizeHtml'})
export class SanitizeHtmlPipe implements PipeTransform {
constructor(private _sanitizer:DomSanitizer) {
}
transform(v:string):SafeHtml {
return this._sanitizer.bypassSecurityTrustHtml(v);
}
}
Update: Figured it out from the dom_sanitization_service.ts source. The bypassSecurityTrustHtml function returns a new SafeHtmlImpl(value); instance. During the sanitize process, there is a check: if (value instanceof SafeHtmlImpl), and if so, the sanitization process is skipped
angular
asked Nov 18 '18 at 22:11
DrenaiDrenai
3,44043153
I've used variations of SafeHtml pipe, but I'm wondering how it actually works under the hood. How does Angular know that the text being applied to the DOM has been passed through a pipe and is safe? Is it simply done at the compilation stage or is it a run-time check?
The documentation says:
Calling any of the bypassSecurityTrust... APIs disables Angular's
built-in sanitization for the value passed in
Common implementation of a safe HTML pipe:
import { Pipe, PipeTransform } from '@angular/core';
import { DomSanitizer, SafeHtml } from '@angular/platform-browser';
@Pipe({name: 'sanitizeHtml'})
export class SanitizeHtmlPipe implements PipeTransform {
constructor(private _sanitizer:DomSanitizer) {
}
transform(v:string):SafeHtml {
return this._sanitizer.bypassSecurityTrustHtml(v);
}
}
Update: Figured it out from the dom_sanitization_service.ts source. The bypassSecurityTrustHtml function returns a new SafeHtmlImpl(value); instance. During the sanitize process, there is a check: if (value instanceof SafeHtmlImpl), and if so, the sanitization process is skipped
angular
angular
asked Nov 18 '18 at 22:11
DrenaiDrenai
3,44043153
asked Nov 18 '18 at 22:11
DrenaiDrenai
3,44043153
edited Nov 18 '18 at 23:38
Drenai
asked Nov 18 '18 at 22:11
DrenaiDrenai
3,44043153
asked Nov 18 '18 at 22:11
DrenaiDrenai
3,44043153
asked Nov 18 '18 at 22:11
DrenaiDrenai
3,44043153
3,44043153
add a comment |
add a comment |
1 Answer
1
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I think you're misunderstanding the point of the function.
It doesn't actually sanitize, it doesn't even check the HTML.
All it does is create an object which has a flag set so the Angular security won't block it. If the string has unsafe HTML, it won't be blocked.
The developer is still supposed to write some function themselves or use some other tool to make sure that the HTML is safe.
answered Nov 18 '18 at 22:21
Simon KSimon K
1,6831414
I know it doesn't sanitize. You might have misunderstood the question
– Drenai
Nov 18 '18 at 23:28
Didn't mean any offense by it, yeah it's possible I didn't get what you were asking. I did still answer you by saying that Angular wraps the string in an object (SafeHtml).
– Simon K
Nov 18 '18 at 23:38
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
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oldest
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active
oldest
votes
I think you're misunderstanding the point of the function.
It doesn't actually sanitize, it doesn't even check the HTML.
All it does is create an object which has a flag set so the Angular security won't block it. If the string has unsafe HTML, it won't be blocked.
The developer is still supposed to write some function themselves or use some other tool to make sure that the HTML is safe.
answered Nov 18 '18 at 22:21
Simon KSimon K
1,6831414
I know it doesn't sanitize. You might have misunderstood the question
– Drenai
Nov 18 '18 at 23:28
Didn't mean any offense by it, yeah it's possible I didn't get what you were asking. I did still answer you by saying that Angular wraps the string in an object (SafeHtml).
– Simon K
Nov 18 '18 at 23:38
add a comment |
I think you're misunderstanding the point of the function.
It doesn't actually sanitize, it doesn't even check the HTML.
All it does is create an object which has a flag set so the Angular security won't block it. If the string has unsafe HTML, it won't be blocked.
The developer is still supposed to write some function themselves or use some other tool to make sure that the HTML is safe.
answered Nov 18 '18 at 22:21
Simon KSimon K
1,6831414
I know it doesn't sanitize. You might have misunderstood the question
– Drenai
Nov 18 '18 at 23:28
Didn't mean any offense by it, yeah it's possible I didn't get what you were asking. I did still answer you by saying that Angular wraps the string in an object (SafeHtml).
– Simon K
Nov 18 '18 at 23:38
add a comment |
I think you're misunderstanding the point of the function.
It doesn't actually sanitize, it doesn't even check the HTML.
All it does is create an object which has a flag set so the Angular security won't block it. If the string has unsafe HTML, it won't be blocked.
The developer is still supposed to write some function themselves or use some other tool to make sure that the HTML is safe.
answered Nov 18 '18 at 22:21
Simon KSimon K
1,6831414
I think you're misunderstanding the point of the function.
It doesn't actually sanitize, it doesn't even check the HTML.
All it does is create an object which has a flag set so the Angular security won't block it. If the string has unsafe HTML, it won't be blocked.
The developer is still supposed to write some function themselves or use some other tool to make sure that the HTML is safe.
answered Nov 18 '18 at 22:21
Simon KSimon K
1,6831414
answered Nov 18 '18 at 22:21
Simon KSimon K
1,6831414
answered Nov 18 '18 at 22:21
Simon KSimon K
1,6831414
answered Nov 18 '18 at 22:21
Simon KSimon K
1,6831414
1,6831414
I know it doesn't sanitize. You might have misunderstood the question
– Drenai
Nov 18 '18 at 23:28
Didn't mean any offense by it, yeah it's possible I didn't get what you were asking. I did still answer you by saying that Angular wraps the string in an object (SafeHtml).
– Simon K
Nov 18 '18 at 23:38
add a comment |
I know it doesn't sanitize. You might have misunderstood the question
– Drenai
Nov 18 '18 at 23:28
Didn't mean any offense by it, yeah it's possible I didn't get what you were asking. I did still answer you by saying that Angular wraps the string in an object (SafeHtml).
– Simon K
Nov 18 '18 at 23:38
I know it doesn't sanitize. You might have misunderstood the question
– Drenai
Nov 18 '18 at 23:28
I know it doesn't sanitize. You might have misunderstood the question
– Drenai
Nov 18 '18 at 23:28
Didn't mean any offense by it, yeah it's possible I didn't get what you were asking. I did still answer you by saying that Angular wraps the string in an object (
SafeHtml).– Simon K
Nov 18 '18 at 23:38
Didn't mean any offense by it, yeah it's possible I didn't get what you were asking. I did still answer you by saying that Angular wraps the string in an object (
SafeHtml).– Simon K
Nov 18 '18 at 23:38
add a comment |
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