How to prevent XSS attacks when laravel uses {!!content!!}?

Question

Generally use {{$article->title}},
But sometimes there is a format, so you need this:
{!!$article->body !!},
But this will lead to xss attacks. How to deal with it to prevent xss attacks?

Answer 1

It is recommended to use Purifier to filter, and you can configure filtering rules.

'encoding' => 'UTF-8',
'finalize' => true,
'preload'  => false,
'cachePath' => null,
'settings' => [
    'default' => [
        'HTML.Doctype'             => 'XHTML 1.0 Strict',
        'HTML.Allowed'             => 'p,b,strong,i,em,a[href|title],ul,ol,li,p[style],br,span[style],img[width|height|alt|src]',
        'CSS.AllowedProperties'    => 'font,font-size,font-weight,font-style,font-family,text-decoration,padding-left,color,background-color,text-align',
        'AutoFormat.AutoParagraph' => true,
        'AutoFormat.RemoveEmpty'   => true
    ],
    'test' => [
        'Attr.EnableID' => true
    ],
    "youtube" => [
        "HTML.SafeIframe" => 'true',
        "URI.SafeIframeRegexp" => "%^(http://|https://|//)(www.youtube.com/embed/|player.vimeo.com/video/)%",
    ],
],

How to use

{!! clean($article->body) !!}