XSS prevention

TP6 Packaging usage steps ：

① Use composer Carry out orders , install ezyang/htmlpurifier Extended class library
Under project directory

composer require ezyang/htmlpurifier

② stay app/common.php In the definition of remove_xss function

if (!function_exists('remove_xss')) {
    // Use htmlpurifier To guard against xss attack 
    function remove_xss($string){
        // relative index.php Entrance file , introduce HTMLPurifier.auto.php Core documents 
        //require_once './plugins/htmlpurifier/HTMLPurifier.auto.php';
        //  Generate configuration object 
        $cfg = HTMLPurifier_Config::createDefault();
        //  Here is the configuration ：
        $cfg -> set('Core.Encoding', 'UTF-8');
        //  Set the allowed HTML label 
        $cfg -> set('HTML.Allowed','div,b,strong,i,em,a[href|title],ul,ol,li,br,p[style],span[style],img[width|height|alt|src]');
        //  Set the allowed CSS Style attribute 
        $cfg -> set('CSS.AllowedProperties', 'font,font-size,font-weight,font-style,font-family,text-decoration,padding-left,color,background-color,text-align');
        //  Set up a Is it allowed to use... On the label target="_blank"
        $cfg -> set('HTML.TargetBlank', TRUE);
        //  Use configuration to generate objects for filtering 
        $obj = new HTMLPurifier($cfg);
        //  Filter strings 
        return $obj -> purify($string);
    }
}

explain ：htmlpurifier plug-in unit , It will filter out script The label and what the label contains js Code .

The second kind ： Encapsulate global filtering method

Set the global filtering method to htmlspecialchars

[ This method will make the payment function of the initial version unusable ]

By default, the framework does not set any global filtering rules , You can app\Request Object filter Global filter properties ：

namespace app;
 
class Request extends \think\Request
{
    protected $filter = ['htmlspecialchars'];

}

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