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invoiceninja/app/Libraries/HTMLUtils.php

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<?php
namespace App\Libraries;
use HTMLPurifier;
use HTMLPurifier_Config;
class HTMLUtils
{
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public static function sanitizeCSS($css)
{
// Allow referencing the body element
$css = preg_replace('/(?<![a-z0-9\-\_\#\.])body(?![a-z0-9\-\_])/i', '.body', $css);
//
// Inspired by http://stackoverflow.com/a/5209050/1721527, dleavitt <https://stackoverflow.com/users/362110/dleavitt>
//
// Create a new configuration object
$config = HTMLPurifier_Config::createDefault();
$config->set('Filter.ExtractStyleBlocks', true);
$config->set('CSS.AllowImportant', true);
$config->set('CSS.AllowTricky', true);
$config->set('CSS.Trusted', true);
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$config->set('Cache.SerializerPath', base_path('storage/framework/cache'));
// Create a new purifier instance
$purifier = new HTMLPurifier($config);
// Wrap our CSS in style tags and pass to purifier.
// we're not actually interested in the html response though
$purifier->purify('<style>'.$css.'</style>');
// The "style" blocks are stored seperately
$css = $purifier->context->get('StyleBlocks');
// Get the first style block
return count($css) ? $css[0] : '';
}
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public static function sanitizeHTML($html)
{
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$html = html_entity_decode($html);
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$config = HTMLPurifier_Config::createDefault();
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$config->set('Cache.SerializerPath', base_path('storage/framework/cache'));
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$purifier = new HTMLPurifier($config);
return $purifier->purify($html);
}
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public static function previousUrl($fallback)
{
$previous = url()->previous();
$current = request()->url();
if ($previous == $current) {
return url($fallback);
} else {
return $previous;
}
}
public static function getEnvForAccount($field, $default = '')
{
$key = '';
if ($user = auth()->user()) {
$key .= $user->account->id . '_';
}
$key .= $field;
return env($key, env($field, $default));
}
}