<?php

class PhpPsInfo
{
    protected $login;
    protected $password;

    const DEFAULT_PASSWORD = 'prestashop';
    const DEFAULT_LOGIN = 'prestashop';

    const TYPE_OK = true;
    const TYPE_ERROR = false;
    const TYPE_WARNING = null;

    protected $requirements = [
        'versions' => [
            'php' => '5.6',
            'mysql' => '5.5',
        ],
        'extensions' => [
            'curl' => true,
            'dom' => true,
            'fileinfo' => true,
            'gd' => true,
            'imagick' => false,
            'intl' => true,
            'json' => true,
            'openssl' => true,
            'mbstring' => true,
            'memcache' => false,
            'memcached' => false,
            'pdo_mysql' => true,
            'zip' => true,
            'bcmath' => false,
        ],
        'config' => [
            'allow_url_fopen' => true,
            'expose_php' => false,
            'file_uploads' => true,
            'max_input_vars' => 1000,
            'memory_limit' => '64M',
            'post_max_size' => '16M',
            'register_argc_argv' => false,
            'set_time_limit' => true,
            'short_open_tag' => false,
            'upload_max_filesize' => '4M',
        ],
        'directories' => [
            'cache_dir' => 'var/cache',
            'log_dir' => 'var/logs',
            'img_dir' => 'img',
            'mails_dir' => 'mails',
            'module_dir' => 'modules',
            'translations_dir' => 'translations',
            'customizable_products_dir' => 'upload',
            'virtual_products_dir' => 'download',
            'config_sf2_dir' => 'app/config',
            'translations_sf2' => 'app/Resources/translations',
        ],
        'apache_modules' => [
            'mod_rewrite' => true,
        ],
    ];

    protected $recommended = [
        'versions' => [
            'php' => '7.1',
            'mysql' => '5.6',
        ],
        'extensions' => [
            'curl' => true,
            'dom' => true,
            'fileinfo' => true,
            'gd' => true,
            'imagick' => true,
            'intl' => true,
            'json' => true,
            'openssl' => true,
            'mbstring' => true,
            'memcache' => false,
            'memcached' => true,
            'pdo_mysql' => true,
            'zip' => true,
            'bcmath' => true,
        ],
        'config' => [
            'allow_url_fopen' => true,
            'expose_php' => false,
            'file_uploads' => true,
            'max_input_vars' => 5000,
            'memory_limit' => '256M',
            'post_max_size' => '128M',
            'register_argc_argv' => false,
            'set_time_limit' => true,
            'short_open_tag' => false,
            'upload_max_filesize' => '128M',
        ],
        'apache_modules' => [
            'mod_rewrite' => true,
        ],
    ];

    /**
     * Set up login and password with parameter or
     * you can set server env vars:
     *  - PS_INFO_LOGIN
     *  - PS_INFO_PASSWORD
     *
     * @param string $login    Login
     * @param string $password Password
     *
     */
    public function __construct($login = self::DEFAULT_LOGIN, $password = self::DEFAULT_PASSWORD)
    {
        if (!empty($_SERVER['PS_INFO_LOGIN'])) {
            $this->login = $_SERVER['PS_INFO_LOGIN'];
        }

        if (!empty($_SERVER['PS_INFO_PASSWORD'])) {
            $this->password = $_SERVER['PS_INFO_PASSWORD'];
        }

        $this->login = !empty($login) ? $login : $this->login;
        $this->password = !empty($password) ? $password : $this->password;
    }

    /**
     * Check authentication if not in cli and have a login
     */
    public function checkAuth()
    {
        if (PHP_SAPI === 'cli' ||
            empty($this->login)
        ) {
            return;
        }

        if (!isset($_SERVER['PHP_AUTH_USER']) ||
            $_SERVER['PHP_AUTH_PW'] != $this->password ||
            $_SERVER['PHP_AUTH_USER'] != $this->login
        ) {
            header('WWW-Authenticate: Basic realm="Authentification"');
            header('HTTP/1.0 401 Unauthorized');
            echo '401 Unauthorized';
            exit(401);
        }
    }

    /**
     * Get versions data
     *
     * @return array
     */
    public function getVersions()
    {
        $data = [
            'Web server' => [$this->getWebServer()],
            'PHP Type' => [
                strpos(PHP_SAPI, 'cgi') !== false ?
                'CGI with Apache Worker or another webserver' :
                'Apache Module (low performance)'
            ],
        ];

        $data['PHP Version'] = [
            $this->requirements['versions']['php'],
            $this->recommended['versions']['php'],
            PHP_VERSION,
            version_compare(PHP_VERSION, $this->recommended['versions']['php'], '>=') ?
            self::TYPE_OK : (
                version_compare(PHP_VERSION, $this->requirements['versions']['php'], '>=') ?
                self::TYPE_WARNING :
                self::TYPE_ERROR
            )
        ];

        if (!extension_loaded('mysqli') || !is_callable('mysqli_connect')) {
            $data['MySQLi Extension'] = [
                true,
                true,
                'Not installed',
                self::TYPE_ERROR,
            ];
        } else {
            $data['MySQLi Extension'] = [
                $this->requirements['versions']['mysql'],
                $this->recommended['versions']['mysql'],
                mysqli_get_client_info(),
                self::TYPE_OK,
            ];
        }

        $data['Internet connectivity (Prestashop)'] = [
            false,
            true,
            gethostbyname('www.prestashop.com') !== 'www.prestashop.com',
            gethostbyname('www.prestashop.com') !== 'www.prestashop.com',
        ];

        return $data;
    }

    /**
     * Get php extensions data
     *
     * @return array
     */
    public function getPhpExtensions()
    {
        $data = [];
        $vars = [
            'BCMath Arbitrary Precision Mathematics' => 'bcmath',
            'Client URL Library (Curl)' => 'curl',
            'Image Processing and GD' => 'gd',
            'Image Processing (ImageMagick)' => 'imagick',
            'Internationalization Functions (Intl)' => 'intl',
            'Memcache' => 'memcache',
            'Memcached' => 'memcached',
            'Multibyte String (Mbstring)' => 'mbstring',
            'OpenSSL' => 'openssl',
            'File Information (Fileinfo)' => 'fileinfo',
            'JavaScript Object Notation (Json)' => 'json',
            'PDO and MySQL Functions' => 'pdo_mysql',
        ];
        foreach ($vars as $label => $var) {
            $value = extension_loaded($var);
            $data[$label] = [
                $this->requirements['extensions'][$var],
                $this->recommended['extensions'][$var],
                $value
            ];
        }

        $vars = [
            'PHP-DOM and PHP-XML' => ['dom', 'DomDocument'],
            'Zip' => ['zip', 'ZipArchive'],
        ];
        foreach ($vars as $label => $var) {
            $value = class_exists($var[1]);
            $data[$label] = [
                $this->requirements['extensions'][$var[0]],
                $this->recommended['extensions'][$var[0]],
                $value
            ];
        }

        return $data;
    }

    /**
     * Get php config data
     *
     * @return array
     */
    public function getPhpConfig()
    {
        $data = [];
        $vars = [
            'allow_url_fopen',
            'expose_php',
            'file_uploads',
            'register_argc_argv',
            'short_open_tag',
        ];
        foreach ($vars as $var) {
            $value = (bool) ini_get($var);
            $data[$var] = [
                $this->requirements['config'][$var],
                $this->recommended['config'][$var],
                $value
            ];
        }

        $vars = [
            'max_input_vars',
            'memory_limit',
            'post_max_size',
            'upload_max_filesize',
        ];
        foreach ($vars as $var) {
            $value = ini_get($var);
            if ($this->toBytes($value) >= $this->toBytes($this->recommended['config'][$var])) {
                $result = self::TYPE_OK;
            } elseif ($this->toBytes($value) >= $this->toBytes($this->requirements['config'][$var])) {
                $result = self::TYPE_WARNING;
            } else {
                $result = self::TYPE_ERROR;
            }

            $data[$var] = [
                $this->requirements['config'][$var],
                $this->recommended['config'][$var],
                $value,
                $result,
            ];
        }

        $vars = [
            'set_time_limit',
        ];
        foreach ($vars as $var) {
            $value = is_callable($var);
            $data[$var] = [
                $this->recommended['config'][$var],
                $this->requirements['config'][$var],
                $value
            ];
        }

        return $data;
    }

    /**
     * Check if directories are writable
     *
     * @return array
     */
    public function getDirectories()
    {
        $data = [];
        foreach ($this->requirements['directories'] as $directory) {
            $directoryPath = getcwd() . DIRECTORY_SEPARATOR . trim($directory, '\\/');
            $data[$directory] = [file_exists($directoryPath) && is_writable($directoryPath)];
        }

        return $data;
    }

    public function getServerModules()
    {
        $data = [];
        if ($this->getWebServer() !== 'Apache' || !function_exists('apache_get_modules')) {
            return $data;
        }

        $modules = apache_get_modules();
        $vars = array_keys($this->requirements['apache_modules']);
        foreach ($vars as $var) {
            $value = in_array($var, $modules);
            $data[$var] = [
                $this->requirements['apache_modules'][$var],
                $this->recommended['apache_modules'][$var],
                $value,
            ];
        }

        return $data;
    }

    /**
     * Convert PHP variable (G/M/K) to bytes
     * Source: http://php.net/manual/fr/function.ini-get.php
     *
     * @return integer
     */
    public function toBytes($val)
    {
        if (is_numeric($val)) {
            return $val;
        }

        $val = trim($val);
        $val = (int) $val;
        switch (strtolower($val[strlen($val)-1])) {
            case 'g':
                $val *= 1024;
                // continue
            case 'm':
                $val *= 1024;
                // continue
            case 'k':
                $val *= 1024;
        }

        return $val;
    }

    /**
     * Transform value to string
     *
     * @param mixed $value Value
     *
     * @return string
     */
    public function toString($value)
    {
        if ($value === true) {
            return 'Yes';
        } elseif ($value === false) {
            return 'No';
        } elseif ($value === null) {
            return 'N/A';
        }

        return strval($value);
    }

    /**
     * Get html class
     *
     * @param array $data
     * @return string
     */
    public function toHtmlClass(array $data)
    {
        if (count($data) === 1 && !is_bool($data[0])) {
            return 'table-info';
        }


        if (count($data) === 1 && is_bool($data[0])) {
            $result = $data[0];
        } elseif (array_key_exists(3, $data)) {
            $result = $data[3];
        } else {
            if ($data[2] >= $data[1]) {
                $result = self::TYPE_OK;
            } elseif ($data[2] >= $data[0]) {
                $result = self::TYPE_WARNING;
            } else {
                $result = self::TYPE_ERROR;
            }
        }

        if ($result === false) {
            return 'table-danger';
        }

        if ($result === null) {
            return 'table-warning';
        }

        return 'table-success';
    }

    /**
     * Detect Web server
     *
     * @return string
     */
    protected function getWebServer()
    {
        if (stristr($_SERVER['SERVER_SOFTWARE'], 'Apache') !== false) {
            return 'Apache';
        } elseif (stristr($_SERVER['SERVER_SOFTWARE'], 'LiteSpeed') !== false) {
            return 'Lite Speed';
        } elseif (stristr($_SERVER['SERVER_SOFTWARE'], 'Nginx') !== false) {
            return 'Nginx';
        } elseif (stristr($_SERVER['SERVER_SOFTWARE'], 'lighttpd') !== false) {
            return 'lighttpd';
        } elseif (stristr($_SERVER['SERVER_SOFTWARE'], 'IIS') !== false) {
            return 'Microsoft IIS';
        }

        return 'Not detected';
    }

    /**
     * Determines if a command exists on the current environment
     * Source: https://stackoverflow.com/questions/12424787/how-to-check-if-a-shell-command-exists-from-php
     *
     * @param string $command The command to check
     *
     * @return bool
     */
    protected function commandExists($command)
    {
        $which = (PHP_OS == 'WINNT') ? 'where' : 'which';

        $process = proc_open(
            $which . ' ' . $command,
            [
                ['pipe', 'r'], //STDIN
                ['pipe', 'w'], //STDOUT
                ['pipe', 'w'], //STDERR
            ],
            $pipes
        );

        if ($process !== false) {
            $stdout = stream_get_contents($pipes[1]);
            $stderr = stream_get_contents($pipes[2]);
            fclose($pipes[1]);
            fclose($pipes[2]);
            proc_close($process);

            return $stdout != '';
        }

        return false;
    }
}

// Init render
$info = new PhpPsInfo();
$info->checkAuth();
?>
<!doctype html>
<html lang="en">
    <head>
        <meta charset="utf-8"/>
        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"/>
        <meta name="description" content=""/>
        <meta name="author" content=""/>
        <link rel="icon" href="../../../../favicon.ico"/>

        <title>PHP PrestaShop Info</title>
        <link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" />
        <style>
            h1 {font-size:2rem;}
        </style>
    </head>

    <body>
        <nav class="navbar navbar-dark bg-dark flex-md-nowrap p-0 shadow">
            <a class="navbar-brand col-sm-3 col-md-2 mr-0" href="#">PHP PrestaShop Info</a>
        </nav>

        <div class="container-fluid">
            <div class="row justify-content-md-center">
                <main role="main" class="col-8">
                    <h1>General information & PHP/MySQL Version</h1>
                    <div class="table-responsive">
                        <table class="table table-striped table-sm text-center">
                            <thead>
                                <tr>
                                    <th class="text-left">#</th>
                                    <th>Required</th>
                                    <th>Recommended</th>
                                    <th>Current</th>
                                </tr>
                            </thead>
                            <tbody>
                                <?php foreach ($info->getVersions() as $label => $data) : ?>
                                    <?php if (count($data) === 1) : ?>
                                        <tr>
                                            <td class="text-left"><?php echo $label ?></td>
                                            <td class="<?php echo $info->toHtmlClass($data); ?>" colspan="3"><?php echo $info->toString($data[0]) ?></td>
                                        </tr>
                                    <?php else : ?>
                                        <tr>
                                            <td class="text-left"><?php echo $label ?></td>
                                            <td><?php echo $info->toString($data[0]) ?></td>
                                            <td><?php echo $info->toString($data[1]) ?></td>
                                            <td class="<?php echo $info->toHtmlClass($data); ?>"><?php echo $info->toString($data[2]) ?></td>
                                        </tr>
                                    <?php endif; ?>
                                <?php endforeach; ?>
                            </tbody>
                        </table>
                    </div>

                    <h1>PHP Configuration</h1>

                    <div class="table-responsive">
                        <table class="table table-striped table-sm text-center">
                            <thead>
                                <tr>
                                    <th class="text-left">#</th>
                                    <th>Required</th>
                                    <th>Recommended</th>
                                    <th>Current</th>
                                </tr>
                            </thead>
                            <tbody>
                                <?php foreach ($info->getPhpConfig() as $label => $data) : ?>
                                    <tr>
                                        <td class="text-left"><?php echo $label ?></td>
                                        <td><?php echo $info->toString($data[0]) ?></td>
                                        <td><?php echo $info->toString($data[1]) ?></td>
                                        <td class="<?php echo $info->toHtmlClass($data); ?>"><?php echo $info->toString($data[2]) ?></td>
                                    </tr>
                                <?php endforeach; ?>
                            </tbody>
                        </table>
                    </div>

                    <h1>PHP Extensions</h1>

                    <div class="table-responsive">
                        <table class="table table-striped table-sm text-center">
                            <thead>
                                <tr>
                                    <th class="text-left">#</th>
                                    <th>Required</th>
                                    <th>Recommended</th>
                                    <th>Current</th>
                                </tr>
                            </thead>
                            <tbody>
                                <?php foreach ($info->getPhpExtensions() as $label => $data) : ?>
                                    <tr>
                                        <td class="text-left"><?php echo $label ?></td>
                                        <td><?php echo $info->toString($data[0]) ?></td>
                                        <td><?php echo $info->toString($data[1]) ?></td>
                                        <td class="<?php echo $info->toHtmlClass($data); ?>"><?php echo $info->toString($data[2]) ?></td>
                                    </tr>
                                <?php endforeach; ?>
                            </tbody>
                        </table>
                    </div>

                    <h1>Directories</h1>

                    <div class="table-responsive">
                        <table class="table table-striped table-sm text-center">
                            <thead>
                                <tr>
                                    <th class="text-left">#</th>
                                    <th>Is Writable</th>
                                </tr>
                            </thead>
                            <tbody>
                                <?php foreach ($info->getDirectories() as $label => $data) : ?>
                                    <tr>
                                        <td class="text-left"><?php echo $label ?></td>
                                        <td class="<?php echo $info->toHtmlClass($data); ?>"><?php echo $info->toString($data[0]) ?></td>
                                    </tr>
                                <?php endforeach; ?>
                            </tbody>
                        </table>
                    </div>

                    <?php if (count($info->getServerModules()) > 0): ?>
                        <h1>Apache Modules</h1>

                        <div class="table-responsive">
                            <table class="table table-striped table-sm text-center">
                                <thead>
                                    <tr>
                                        <th class="text-left">#</th>
                                        <th>Required</th>
                                        <th>Recommended</th>
                                        <th>Current</th>
                                    </tr>
                                </thead>
                                <tbody>
                                    <?php foreach ($info->getServerModules() as $label => $data) : ?>
                                        <tr>
                                            <td class="text-left"><?php echo $label ?></td>
                                            <td><?php echo $info->toString($data[0]) ?></td>
                                            <td><?php echo $info->toString($data[1]) ?></td>
                                            <td class="<?php echo $info->toHtmlClass($data); ?>"><?php echo $info->toString($data[2]) ?></td>
                                        </tr>
                                    <?php endforeach; ?>
                                </tbody>
                            </table>
                        </div>
                    <?php endif; ?>
                </main>
            </div>
        </div>

        <footer class="footer-copyright text-center py-3">
            © <?php echo date('Y') ?> Copyright: <a href="https://prestashop.com/">PrestaShop</a>
        </footer>
    </body>
</html>