LegacyPathHelper.php

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<?php
declare(strict_types=1);

namespace ILIAS\Filesystem\Util;

use ILIAS\Filesystem\Filesystem;
use ILIAS\Filesystem\FilesystemsAware;

final class LegacyPathHelper
{
    use FilesystemsAware;


    public static function deriveFilesystemFrom(string $absolute_path) : Filesystem
    {
        list(
            $web, $webRelativeWithLeadingDot, $webRelativeWithoutLeadingDot, $storage, $customizing, $customizingRelativeWithLeadingDot, $libs, $libsRelativeWithLeadingDot, $temp
            )
            = self::listPaths();

        switch (true) {
            case self::checkPossiblePath($temp, $absolute_path):
                return self::filesystems()->temp();
            case self::checkPossiblePath($web, $absolute_path):
                return self::filesystems()->web();
            case self::checkPossiblePath($webRelativeWithLeadingDot, $absolute_path):
                return self::filesystems()->web();
            case self::checkPossiblePath($webRelativeWithoutLeadingDot, $absolute_path):
                return self::filesystems()->web();
            case self::checkPossiblePath($storage, $absolute_path):
                return self::filesystems()->storage();
            case self::checkPossiblePath($customizing, $absolute_path):
                return self::filesystems()->customizing();
            case self::checkPossiblePath($customizingRelativeWithLeadingDot, $absolute_path):
                return self::filesystems()->customizing();
            case self::checkPossiblePath($libs, $absolute_path):
                return self::filesystems()->libs();
            case self::checkPossiblePath($libsRelativeWithLeadingDot, $absolute_path):
                return self::filesystems()->libs();
            default:
                throw new \InvalidArgumentException("Invalid path supplied. Path must start with the web, storage, temp, customizing or libs storage location. Path given: '{$absolute_path}'");
        }
    }


    public static function createRelativePath(string $absolute_path) : string
    {
        list(
            $web, $webRelativeWithLeadingDot, $webRelativeWithoutLeadingDot, $storage, $customizing, $customizingRelativeWithLeadingDot, $libs, $libsRelativeWithLeadingDot, $temp
            )
            = self::listPaths();

        switch (true) {
            // web without ./
            case self::checkPossiblePath($webRelativeWithoutLeadingDot, $absolute_path):
                return self::resolveRelativePath($webRelativeWithoutLeadingDot, $absolute_path);
            // web with ./
            case self::checkPossiblePath($webRelativeWithLeadingDot, $absolute_path):
                return self::resolveRelativePath($webRelativeWithLeadingDot, $absolute_path);
            // web/
            case self::checkPossiblePath($web, $absolute_path):
                return self::resolveRelativePath($web, $absolute_path);
            // temp/
            case self::checkPossiblePath($temp, $absolute_path):
                return self::resolveRelativePath($temp, $absolute_path);
            // iliasdata/
            case self::checkPossiblePath($storage, $absolute_path):
                return self::resolveRelativePath($storage, $absolute_path);
            // Customizing/
            case self::checkPossiblePath($customizing, $absolute_path):
                return self::resolveRelativePath($customizing, $absolute_path);
            // ./Customizing/
            case self::checkPossiblePath($customizingRelativeWithLeadingDot, $absolute_path):
                return self::resolveRelativePath($customizingRelativeWithLeadingDot, $absolute_path);
            // libs/
            case self::checkPossiblePath($libs, $absolute_path):
                // ./libs
            case self::checkPossiblePath($libsRelativeWithLeadingDot, $absolute_path):
                return self::resolveRelativePath($libsRelativeWithLeadingDot, $absolute_path);
            default:
                throw new \InvalidArgumentException("Invalid path supplied. Path must start with the web, storage, temp, customizing or libs storage location. Path given: '{$absolute_path}'");
        }
    }


    private static function resolveRelativePath(string $possible_path, string $absolute_path) : string
    {
        $real_possible_path = realpath($possible_path);

        switch (true) {
            case $possible_path === $absolute_path:
            case $real_possible_path === $absolute_path:
                return "";
            case strpos($absolute_path, $possible_path) === 0:
                return substr($absolute_path, strlen($possible_path) + 1);                             //also remove the trailing slash
            case strpos($absolute_path, $real_possible_path) === 0:
                return substr($absolute_path, strlen($real_possible_path) + 1);                             //also remove the trailing slash
            default:
                throw new \InvalidArgumentException("Invalid path supplied. Path must start with the web, storage, temp, customizing or libs storage location. Path given: '{$absolute_path}'");
        }
    }


    private static function checkPossiblePath(string $possible_path, string $absolute_path) : bool
    {
        $real_possible_path = realpath($possible_path);

        switch (true) {
            case $possible_path === $absolute_path:
                return true;
            case $real_possible_path === $absolute_path:
                return true;
            case strpos($absolute_path, $possible_path) === 0:
                return true;
            case strpos($absolute_path, $real_possible_path) === 0:
                return true;
            default:
                return false;
        }
    }


    private static function listPaths() : array
    {
        $web = CLIENT_WEB_DIR;
        $webRelativeWithLeadingDot = './' . ILIAS_WEB_DIR . '/' . CLIENT_ID;
        $webRelativeWithoutLeadingDot = ILIAS_WEB_DIR . '/' . CLIENT_ID;
        $storage = CLIENT_DATA_DIR;
        $customizing = ILIAS_ABSOLUTE_PATH . '/Customizing';
        $customizingRelativeWithLeadingDot = './Customizing';
        $libs = ILIAS_ABSOLUTE_PATH . '/libs';
        $libsRelativeWithLeadingDot = "./libs";
        $temp = CLIENT_DATA_DIR . "/temp";

        return array($web, $webRelativeWithLeadingDot, $webRelativeWithoutLeadingDot, $storage, $customizing, $customizingRelativeWithLeadingDot, $libs, $libsRelativeWithLeadingDot, $temp);
    }
}