<?php

// must be called POST validation

/**
 * Adds target="blank" to all outbound links.  This transform is
 * only attached if Attr.TargetBlank is TRUE.  This works regardless
 * of whether or not Attr.AllowedFrameTargets
 */
class HTMLPurifier_AttrTransform_TargetBlank extends HTMLPurifier_AttrTransform
{
    /**
     * @type HTMLPurifier_URIParser
     */
    private $parser;

    public function __construct()
    {
        $this->parser = new HTMLPurifier_URIParser();
    }

    /**
     * @param array $attr
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return array
     */
    public function transform($attr, $config, $context)
    {
        if (!isset($attr['href'])) {
            return $attr;
        }

        // XXX Kind of inefficient
        $url = $this->parser->parse($attr['href']);
        
        // Ignore invalid schemes (e.g. `javascript:`)
        if (!($scheme = $url->getSchemeObj($config, $context))) {
            return $attr;
        }

        if ($scheme->browsable && !$url->isBenign($config, $context)) {
            $attr['target'] = '_blank';
        }
        return $attr;
    }
}

// vim: et sw=4 sts=4

• [F] Background.php
  Delete
• [F] BdoDir.php
  Delete
• [F] BgColor.php
  Delete
• [F] BoolToCSS.php
  Delete
• [F] Border.php
  Delete
• [F] EnumToCSS.php
  Delete
• [F] ImgRequired.php
  Delete
• [F] ImgSpace.php
  Delete
• [F] Input.php
  Delete
• [F] Lang.php
  Delete
• [F] Length.php
  Delete
• [F] Name.php
  Delete
• [F] NameSync.php
  Delete
• [F] Nofollow.php
  Delete
• [F] SafeEmbed.php
  Delete
• [F] SafeObject.php
  Delete
• [F] SafeParam.php
  Delete
• [F] ScriptRequired.php
  Delete
• [F] TargetBlank.php
  Delete
• [F] TargetNoopener.php
  Delete
• [F] TargetNoreferrer.php
  Delete
• [F] Textarea.php
  Delete

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