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Editing: AlterHtmlHelper.php

<?php

namespace WebPExpress;

//use AlterHtmlInit;
use \WebPExpress\Config;
use \WebPExpress\Paths;
use \WebPExpress\PathHelper;
use \WebPExpress\Multisite;
use \WebPExpress\Option;

class AlterHtmlHelper
{

public static $options;
    /*
    public static function hasWebP($src)
    {
        return true;
    }

public static function inUploadDir($src)
    {
        $upload_dir = wp_upload_dir();
        $src_url = parse_url($upload_dir['baseurl']);
        $upload_path = $src_url['path'];

return (strpos($src, $upload_path) !== false );

}

public static function checkSrc($src)
    {
        self::$options = \WebPExpress\AlterHtmlInit::self::$options();

if (self::$options['destination-folder'] == 'mingled') {

}
    }
*/

public static function getOptions() {
      if (!isset(self::$options)) {
          self::$options = json_decode(Option::getOption('webp-express-alter-html-options', null), true);

// Set scope if it isn't there (it wasn't cached until 0.17.5)
          if (!isset(self::$options['scope'])) {
            $config = Config::loadConfig();
            if ($config) {
              $config = Config::fix($config, false);
              self::$options['scope'] = $config['scope'];

Option::updateOption(
                  'webp-express-alter-html-options',
                  json_encode(self::$options, JSON_UNESCAPED_SLASHES | JSON_NUMERIC_CHECK),
                  true
              );
            }
          }
      }
    }

/**
     *  Gets relative path between a base url and another.
     *  Returns false if the url isn't a subpath
     *
     *  @param $imageUrl       (ie "http://example.com/wp-content/image.jpg")
     *  @param $baseUrl        (ie "http://example.com/wp-content")
     *  @return path or false  (ie "/image.jpg")
     */
    public static function getRelUrlPath($imageUrl, $baseUrl)
    {
        $baseUrlComponents = parse_url($baseUrl);
        /* ie:
        (
            [scheme] => http
            [host] => we0
            [path] => /wordpress/uploads-moved
        )*/

$imageUrlComponents = parse_url($imageUrl);
        /* ie:
        (
            [scheme] => http
            [host] => we0
            [path] => /wordpress/uploads-moved/logo.jpg
        )*/
        if ($baseUrlComponents['host'] != $imageUrlComponents['host']) {
            return false;
        }

// Check if path begins with base path
        if (strpos($imageUrlComponents['path'], $baseUrlComponents['path']) !== 0) {
            return false;
        }

// Remove base path from path (we know it begins with basepath, from previous check)
        return substr($imageUrlComponents['path'], strlen($baseUrlComponents['path']));

}

/**
     *  Looks if $imageUrl is rooted in $baseUrl and if the file is there
     *  PS: NOT USED ANYMORE!
     *
     *  @param $imageUrl    (ie http://example.com/wp-content/image.jpg)
     *  @param $baseUrl     (ie http://example.com/wp-content)
     *  @param $baseDir     (ie /var/www/example.com/wp-content)
     */
    public static function isImageUrlHere($imageUrl, $baseUrl, $baseDir)
    {

$srcPathRel = self::getRelUrlPath($imageUrl, $baseUrl);

if ($srcPathRel === false) {
            return false;
        }

// Calculate file path to src
        $srcPathAbs = $baseDir . $srcPathRel;
        //return 'dyt:' . $srcPathAbs;

// Check that src file exists
        if (!@file_exists($srcPathAbs)) {
            return false;
        }

return true;

}

// NOT USED ANYMORE
    public static function isSourceInUpload($src)
    {
        /* $src is ie http://we0/wp-content-moved/themes/twentyseventeen/assets/images/header.jpg */

$uploadDir = wp_upload_dir();
        /* ie:

[path] => /var/www/webp-express-tests/we0/wordpress/uploads-moved
            [url] => http://we0/wordpress/uploads-moved
            [subdir] =>
            [basedir] => /var/www/webp-express-tests/we0/wordpress/uploads-moved
            [baseurl] => http://we0/wordpress/uploads-moved
            [error] =>
        */

return self::isImageUrlHere($src, $uploadDir['baseurl'], $uploadDir['basedir']);
    }

/**
     *  Get url for webp from source url,  (if ), given a certain baseUrl / baseDir.
     *  Base can for example be uploads or wp-content.
     *
     *  returns false
     *  - if no source file found in that base
     *  - or source file is found but webp file isn't there and the `only-for-webps-that-exists` option is set
     *
     *  @param  string  $sourceUrl   Url of source image (ie http://example.com/wp-content/image.jpg)
     *  @param  string  $rootId      Id (created in Config::updateAutoloadedOptions). Ie "uploads", "content" or any image root id
     *  @param  string  $baseUrl     Base url of source image (ie http://example.com/wp-content)
     *  @param  string  $baseDir     Base dir of source image (ie /var/www/example.com/wp-content)
     */
    public static function getWebPUrlInImageRoot($sourceUrl, $rootId, $baseUrl, $baseDir)
    {
        //error_log('getWebPUrlInImageRoot:' . $sourceUrl . ':' . $baseUrl . ':' . $baseDir);

$srcPathRel = self::getRelUrlPath($sourceUrl, $baseUrl);

if ($srcPathRel === false) {
            return false;
        }

// Calculate file path to source
        $srcPathAbs = $baseDir . $srcPathRel;

// Check that source file exists
        if (!@file_exists($srcPathAbs)) {
            return false;
        }

// Calculate destination of webp (both path and url)
        // ----------------------------------------

// We are calculating: $destPathAbs and $destUrl.

// Make sure the options are loaded (and fixed)
        self::getOptions();

if (!isset(self::$options['scope']) || !in_array($rootId, self::$options['scope'])) {
            return false;
        }

$destinationRoot = Paths::destinationRoot(
            $rootId,
            self::$options['destination-folder'],
            self::$options['destination-structure']
        );

$relPathFromImageRootToSource = PathHelper::getRelDir(
            realpath(Paths::getAbsDirById($rootId)),
            realpath($srcPathAbs)
        );
        $relPathFromImageRootToDest = ConvertHelperIndependent::appendOrSetExtension(
            $relPathFromImageRootToSource,
            self::$options['destination-folder'],
            self::$options['destination-extension'],
            ($rootId == 'uploads')
        );
        $destPathAbs = $destinationRoot['abs-path'] . '/' . $relPathFromImageRootToDest;
        $webpMustExist = self::$options['only-for-webps-that-exists'];
        if ($webpMustExist && (!@file_exists($destPathAbs))) {
            return false;
        }

$destUrl = $destinationRoot['url'] . '/' . $relPathFromImageRootToDest;

// Fix scheme (use same as source)
        $sourceUrlComponents = parse_url($sourceUrl);
        $destUrlComponents = parse_url($destUrl);
        return $sourceUrlComponents['scheme'] . '://' . $sourceUrlComponents['host'] . $destUrlComponents['path'];
    }

/**
     *  Get url for webp
     *  returns second argument if no webp
     *
     *  @param $sourceUrl
     *  @param $returnValueOnFail
     */
    public static function getWebPUrl($sourceUrl, $returnValueOnFail)
    {
        // Get the options
        self::getOptions();

// Fail for webp-disabled  browsers (when "only-for-webp-enabled-browsers" is set)
        if ((self::$options['only-for-webp-enabled-browsers']) && (strpos($_SERVER['HTTP_ACCEPT'], 'image/webp') === false)) {
            return $returnValueOnFail;
        }

// Fail for relative urls. Wordpress doesn't use such very much anyway
        if (!preg_match('#^https?://#', $sourceUrl)) {
            return $returnValueOnFail;
        }

// Fail if the image type isn't enabled
        switch (self::$options['image-types']) {
            case 0:
                return $returnValueOnFail;
            case 1:
                if (!preg_match('#(jpe?g)$#', $sourceUrl)) {
                    return $returnValueOnFail;
                }
                break;
            case 2:
                if (!preg_match('#(png)$#', $sourceUrl)) {
                    return $returnValueOnFail;
                }
                break;
            case 3:
                if (!preg_match('#(jpe?g|png)$#', $sourceUrl)) {
                    return $returnValueOnFail;
                }
                break;
        }

//error_log('source url:' . $sourceUrl);

// Try all image roots
        foreach (self::$options['scope'] as $rootId) {
            $baseDir = Paths::getAbsDirById($rootId);
            $baseUrl = Paths::getUrlById($rootId);

//error_log('baseurl: ' . $baseUrl);
            if (Multisite::isMultisite() && ($rootId == 'uploads')) {
                $baseUrl = Paths::getUploadUrl();
                $baseDir = Paths::getUploadDirAbs();
            }

$result = self::getWebPUrlInImageRoot($sourceUrl, $rootId, $baseUrl, $baseDir);
            if ($result !== false) {
                return $result;
            }

// Try the hostname aliases.
            if (!isset(self::$options['hostname-aliases'])) {
                continue;
            }
            $hostnameAliases = self::$options['hostname-aliases'];

$hostname = Paths::getHostNameOfUrl($baseUrl);
            $baseUrlComponents = parse_url($baseUrl);
            $sourceUrlComponents = parse_url($sourceUrl);
            // ie: [scheme] => http, [host] => we0, [path] => /wordpress/uploads-moved

if ((!isset($baseUrlComponents['host'])) || (!isset($sourceUrlComponents['host']))) {
                continue;
            }

foreach ($hostnameAliases as $hostnameAlias) {

if ($sourceUrlComponents['host'] != $hostnameAlias) {
                    continue;
                }
                //error_log('hostname alias:' . $hostnameAlias);

$baseUrlOnAlias = $baseUrlComponents['scheme'] . '://' . $hostnameAlias . $baseUrlComponents['path'];
                //error_log('baseurl (alias):' . $baseUrlOnAlias);

$result = self::getWebPUrlInImageRoot($sourceUrl, $rootId, $baseUrlOnAlias, $baseDir);
                if ($result !== false) {
                    $resultUrlComponents = parse_url($result);
                    return $sourceUrlComponents['scheme'] . '://' . $hostnameAlias . $resultUrlComponents['path'];
                }
            }
        }

return $returnValueOnFail;
    }

/*
    public static function getWebPUrlOrSame($sourceUrl, $returnValueOnFail)
    {
        return self::getWebPUrl($sourceUrl, $sourceUrl);
    }*/

}

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