<?php

namespace WPForms\Vendor;

/**
 * Implements data: URI for base64 encoded images supported by GD.
 */
class HTMLPurifier_URIScheme_data extends HTMLPurifier_URIScheme
{
    /**
     * @type bool
     */
    public $browsable = \true;
    /**
     * @type array
     */
    public $allowed_types = array(
        // you better write validation code for other types if you
        // decide to allow them
        'image/jpeg' => \true,
        'image/gif' => \true,
        'image/png' => \true,
    );
    // this is actually irrelevant since we only write out the path
    // component
    /**
     * @type bool
     */
    public $may_omit_host = \true;
    /**
     * @param HTMLPurifier_URI $uri
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return bool
     */
    public function doValidate(&$uri, $config, $context)
    {
        $result = \explode(',', $uri->path, 2);
        $is_base64 = \false;
        $charset = null;
        $content_type = null;
        if (\count($result) == 2) {
            list($metadata, $data) = $result;
            // do some legwork on the metadata
            $metas = \explode(';', $metadata);
            while (!empty($metas)) {
                $cur = \array_shift($metas);
                if ($cur == 'base64') {
                    $is_base64 = \true;
                    break;
                }
                if (\substr($cur, 0, 8) == 'charset=') {
                    // doesn't match if there are arbitrary spaces, but
                    // whatever dude
                    if ($charset !== null) {
                        continue;
                    }
                    // garbage
                    $charset = \substr($cur, 8);
                    // not used
                } else {
                    if ($content_type !== null) {
                        continue;
                    }
                    // garbage
                    $content_type = $cur;
                }
            }
        } else {
            $data = $result[0];
        }
        if ($content_type !== null && empty($this->allowed_types[$content_type])) {
            return \false;
        }
        if ($charset !== null) {
            // error; we don't allow plaintext stuff
            $charset = null;
        }
        $data = \rawurldecode($data);
        if ($is_base64) {
            $raw_data = \base64_decode($data);
        } else {
            $raw_data = $data;
        }
        if (\strlen($raw_data) < 12) {
            // error; exif_imagetype throws exception with small files,
            // and this likely indicates a corrupt URI/failed parse anyway
            return \false;
        }
        // XXX probably want to refactor this into a general mechanism
        // for filtering arbitrary content types
        if (\function_exists('sys_get_temp_dir')) {
            $file = \tempnam(\sys_get_temp_dir(), "");
        } else {
            $file = \tempnam("/tmp", "");
        }
        \file_put_contents($file, $raw_data);
        if (\function_exists('exif_imagetype')) {
            $image_code = \exif_imagetype($file);
            \unlink($file);
        } elseif (\function_exists('getimagesize')) {
            \set_error_handler(array($this, 'muteErrorHandler'));
            $info = \getimagesize($file);
            \restore_error_handler();
            \unlink($file);
            if ($info == \false) {
                return \false;
            }
            $image_code = $info[2];
        } else {
            \trigger_error("could not find exif_imagetype or getimagesize functions", \E_USER_ERROR);
        }
        $real_content_type = \image_type_to_mime_type($image_code);
        if ($real_content_type != $content_type) {
            // we're nice guys; if the content type is something else we
            // support, change it over
            if (empty($this->allowed_types[$real_content_type])) {
                return \false;
            }
            $content_type = $real_content_type;
        }
        // ok, it's kosher, rewrite what we need
        $uri->userinfo = null;
        $uri->host = null;
        $uri->port = null;
        $uri->fragment = null;
        $uri->query = null;
        $uri->path = "{$content_type};base64," . \base64_encode($raw_data);
        return \true;
    }
    /**
     * @param int $errno
     * @param string $errstr
     */
    public function muteErrorHandler($errno, $errstr)
    {
    }
}
