Sanitizer to allow base64 images?

[andreisctendava]

Hi,

I have a question.

How I can configure the Sanitizer to allow base64 images
<img src=\"data:image/png;base64, iVBORw0KGgo...">
and disallow images like this
<img src="url_to_image">?

Thanks.

[tiesont]

See https://github.com/mganss/HtmlSanitizer/wiki/Examples#ex2-allowing-data-uris for an example of how to allow data URIs. I'd assume you could extend than relatively easily.

There's also the FilterUrl event. You'd likely need to implement a custom event handler for that, assuming your content can have HTTP/HTTPS URLs for other elements, like anchor tags. If not, you could clear the AllowedSchemes collection and then add "data".