<?php
/**
 * Used to get various pieces of information about the server enviroment
 *
 * Standard: PSR-2
 * @link http://www.php-fig.org/psr/psr-2
 *
 * @package Duplicator
 * @subpackage classes/utilites
 * @copyright (c) 2017, Snapcreek LLC
 * @since 1.1.0
 * 
 */
require_once (DUPLICATOR_PLUGIN_PATH.'classes/utilities/class.util.php');

// Exit if accessed directly
if (!defined('DUPLICATOR_VERSION')) {
    exit;
}

class DUP_Server
{

    /**
     * Gets the system requirements which must pass to buld a package
     *
     * @return array   An array of requirements
     */
    public static function getRequirements()
    {
        global $wpdb;
        $dup_tests = array();

        //PHP SUPPORT
        $safe_ini                      = strtolower(ini_get('safe_mode'));
        $dup_tests['PHP']['SAFE_MODE'] = $safe_ini != 'on' || $safe_ini != 'yes' || $safe_ini != 'true' || ini_get("safe_mode") != 1 ? 'Pass' : 'Fail';
        $dup_tests['PHP']['VERSION']   = DUP_Util::$on_php_529_plus ? 'Pass' : 'Fail';
        $dup_tests['PHP']['ZIP']       = class_exists('ZipArchive') ? 'Pass' : 'Fail';
        $dup_tests['PHP']['FUNC_1']    = function_exists("file_get_contents") ? 'Pass' : 'Fail';
        $dup_tests['PHP']['FUNC_2']    = function_exists("file_put_contents") ? 'Pass' : 'Fail';
        $dup_tests['PHP']['FUNC_3']    = function_exists("mb_strlen") ? 'Pass' : 'Fail';
        $dup_tests['PHP']['ALL']       = !in_array('Fail', $dup_tests['PHP']) ? 'Pass' : 'Fail';

        //REQUIRED PATHS
        if (file_exists(DUPLICATOR_SSDIR_PATH) && is_writeable(DUPLICATOR_SSDIR_PATH)) {
            $dup_tests['IO']['SSDIR']  = 'Pass';
            $dup_tests['IO']['WPROOT'] = 'Pass';
        } else {
            $handle_test               = @opendir(DUPLICATOR_WPROOTPATH);
            $dup_tests['IO']['WPROOT'] = is_writeable(DUPLICATOR_WPROOTPATH) && $handle_test ? 'Pass' : 'Fail';
            $dup_tests['IO']['SSDIR']  = 'Fail';
            @closedir($handle_test);
        }

        $dup_tests['IO']['SSTMP'] = is_writeable(DUPLICATOR_SSDIR_PATH_TMP) ? 'Pass' : 'Fail';
        $dup_tests['IO']['ALL']   = !in_array('Fail', $dup_tests['IO']) ? 'Pass' : 'Fail';

        //SERVER SUPPORT
        $dup_tests['SRV']['MYSQLi']    = function_exists('mysqli_connect') ? 'Pass' : 'Fail';
        $dup_tests['SRV']['MYSQL_VER'] = version_compare(DUP_DB::getVersion(), '5.0', '>=') ? 'Pass' : 'Fail';
        $dup_tests['SRV']['ALL']       = !in_array('Fail', $dup_tests['SRV']) ? 'Pass' : 'Fail';

        //RESERVED FILES
        $dup_tests['RES']['INSTALL'] = !(self::hasInstallerFiles()) ? 'Pass' : 'Fail';
        $dup_tests['Success']        = $dup_tests['PHP']['ALL'] == 'Pass'
                                        && $dup_tests['IO']['ALL'] == 'Pass'
                                        && $dup_tests['SRV']['ALL'] == 'Pass'
                                        && $dup_tests['RES']['INSTALL'] == 'Pass';

        return $dup_tests;
    }

    /**
     * Gets the system checks which are not required
     *
     * @return array   An array of system checks
     */
    public static function getChecks()
    {
        $checks = array();

        //WEB SERVER
        $web_test1 = false;
        foreach ($GLOBALS['DUPLICATOR_SERVER_LIST'] as $value) {
            if (stristr($_SERVER['SERVER_SOFTWARE'], $value)) {
                $web_test1 = true;
                break;
            }
        }
        $checks['SRV']['WEB']['model'] = $web_test1;
        $checks['SRV']['WEB']['ALL']   = ($web_test1) ? 'Good' : 'Warn';

        //PHP SETTINGS
        $php_test1 = ini_get("open_basedir");
        $php_test1 = empty($php_test1) ? true : false;
        $php_test2 = ini_get("max_execution_time");
        $php_test2 = ($php_test2 > DUPLICATOR_SCAN_TIMEOUT) || (strcmp($php_test2, 'Off') == 0 || $php_test2 == 0) ? true : false;
        $php_test3 = function_exists('mysqli_connect');
        $php_test4 = DUP_Util::$on_php_53_plus ? true : false;

        $checks['SRV']['PHP']['openbase'] = $php_test1;
        $checks['SRV']['PHP']['maxtime']  = $php_test2;
        $checks['SRV']['PHP']['mysqli']   = $php_test3;
        $checks['SRV']['PHP']['version']  = $php_test4;
        $checks['SRV']['PHP']['ALL']      = ($php_test1 && $php_test2 && $php_test3 && $php_test4) ? 'Good' : 'Warn';


        //WORDPRESS SETTINGS
        global $wp_version;
        $wp_test1 = version_compare($wp_version, DUPLICATOR_SCAN_MIN_WP) >= 0 ? true : false;

        //Core Files
        $files                  = array();
        $files['wp-config.php'] = file_exists(DUP_Util::safePath(DUPLICATOR_WPROOTPATH.'/wp-config.php'));
        $wp_test2               = $files['wp-config.php'];

        //Cache
        $Package       = DUP_Package::getActive();
        $cache_path    = DUP_Util::safePath(WP_CONTENT_DIR).'/cache';
        $dirEmpty      = DUP_Util::isDirectoryEmpty($cache_path);
        $dirSize       = DUP_Util::getDirectorySize($cache_path);
        $cach_filtered = in_array($cache_path, explode(';', $Package->Archive->FilterDirs));
        $wp_test3      = ($cach_filtered || $dirEmpty || $dirSize < DUPLICATOR_SCAN_CACHESIZE ) ? true : false;
        $wp_test4      = is_multisite();

        $checks['SRV']['WP']['version'] = $wp_test1;
        $checks['SRV']['WP']['core']    = $wp_test2;
        $checks['SRV']['WP']['cache']   = $wp_test3;
        $checks['SRV']['WP']['ismu']    = $wp_test4;
        $checks['SRV']['WP']['ALL']     = $wp_test1 && $wp_test2 && $wp_test3 && !$wp_test4 ? 'Good' : 'Warn';

        return $checks;
    }

    /**
     * Check to see if duplicator installer files are present
     *
     * @return bool   True if any reserved files are found
     */
    public static function hasInstallerFiles()
    {
        $files = self::getInstallerFiles();
        foreach ($files as $file => $path) {
            if (file_exists($path)) return true;
        }
        return false;
    }

    /**
     * Gets a list of all the installer files by name and full path
     *
     * @return array [file_name, file_path]
     */
    public static function getInstallerFiles()
    {
        // Files:  installer.php, installer-backup.php, installer-data.sql, installer-log.txt, database.sql
        return array(
            DUPLICATOR_INSTALL_PHP => DUPLICATOR_WPROOTPATH.DUPLICATOR_INSTALL_PHP,
            DUPLICATOR_INSTALL_BAK => DUPLICATOR_WPROOTPATH.DUPLICATOR_INSTALL_BAK,
            DUPLICATOR_INSTALL_SQL => DUPLICATOR_WPROOTPATH.DUPLICATOR_INSTALL_SQL,
            DUPLICATOR_INSTALL_LOG => DUPLICATOR_WPROOTPATH.DUPLICATOR_INSTALL_LOG,
            DUPLICATOR_INSTALL_DB => DUPLICATOR_WPROOTPATH.DUPLICATOR_INSTALL_DB
        );
    }

    /**
     * Get the IP of a client machine
     *
     * @return string   IP of the client machine
     */
    public static function getClientIP()
    {
        if (array_key_exists('HTTP_X_FORWARDED_FOR', $_SERVER)) {
            return $_SERVER["HTTP_X_FORWARDED_FOR"];
        } else if (array_key_exists('REMOTE_ADDR', $_SERVER)) {
            return $_SERVER["REMOTE_ADDR"];
        } else if (array_key_exists('HTTP_CLIENT_IP', $_SERVER)) {
            return $_SERVER["HTTP_CLIENT_IP"];
        }
        return '';
    }

    /**
     * Get PHP memory useage
     *
     * @return string   Returns human readable memory useage.
     */
    public static function getPHPMemory($peak = false)
    {
        if ($peak) {
            $result = 'Unable to read PHP peak memory usage';
            if (function_exists('memory_get_peak_usage')) {
                $result = DUP_Util::byteSize(memory_get_peak_usage(true));
            }
        } else {
            $result = 'Unable to read PHP memory usage';
            if (function_exists('memory_get_usage')) {
                $result = DUP_Util::byteSize(memory_get_usage(true));
            }
        }
        return $result;
    }
}
?>