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<?php

/**
 * This file contains functions that are specifically done by administrators.
 *
 * Simple Machines Forum (SMF)
 *
 * @package SMF
 * @author Simple Machines http://www.simplemachines.org
 * @copyright 2019 Simple Machines and individual contributors
 * @license http://www.simplemachines.org/about/smf/license.php BSD
 *
 * @version 2.1 RC1
 */

if (!defined('SMF'))
    die('No direct access...');

/**
 * Get a list of versions that are currently installed on the server.
 *
 * @param array $checkFor An array of what to check versions for - can contain one or more of 'gd', 'imagemagick', 'db_server', 'phpa', 'memcache', 'xcache', 'apc', 'php' or 'server'
 * @return array An array of versions (keys are same as what was in $checkFor, values are the versions)
 */
function getServerVersions($checkFor)
{
    global $txt, $db_connection, $_PHPA, $smcFunc, $cache_accelerator, $cache_memcached, $cacheAPI, $modSettings;

    loadLanguage('Admin');

    $versions = array();

    // Is GD available?  If it is, we should show version information for it too.
    if (in_array('gd', $checkFor) && function_exists('gd_info'))
    {
        $temp = gd_info();
        $versions['gd'] = array('title' => $txt['support_versions_gd'], 'version' => $temp['GD Version']);
    }

    // Why not have a look at ImageMagick? If it's installed, we should show version information for it too.
    if (in_array('imagemagick', $checkFor) && (class_exists('Imagick') || function_exists('MagickGetVersionString')))
    {
        if (class_exists('Imagick'))
        {
            $temp = New Imagick;
            $temp2 = $temp->getVersion();
            $im_version = $temp2['versionString'];
            $extension_version = 'Imagick ' . phpversion('Imagick');
        }
        else
        {
            $im_version = MagickGetVersionString();
            $extension_version = 'MagickWand ' . phpversion('MagickWand');
        }

        // We already know it's ImageMagick and the website isn't needed...
        $im_version = str_replace(array('ImageMagick ', ' https://www.imagemagick.org'), '', $im_version);
        $versions['imagemagick'] = array('title' => $txt['support_versions_imagemagick'], 'version' => $im_version . ' (' . $extension_version . ')');
    }

    // Now lets check for the Database.
    if (in_array('db_server', $checkFor))
    {
        db_extend();
        if (!isset($db_connection) || $db_connection === false)
            trigger_error('getServerVersions(): you need to be connected to the database in order to get its server version', E_USER_NOTICE);
        else
        {
            $versions['db_engine'] = array('title' => sprintf($txt['support_versions_db_engine'], $smcFunc['db_title']), 'version' => '');
            $versions['db_engine']['version'] = $smcFunc['db_get_vendor']();

            $versions['db_server'] = array('title' => sprintf($txt['support_versions_db'], $smcFunc['db_title']), 'version' => '');
            $versions['db_server']['version'] = $smcFunc['db_get_version']();
        }
    }

    // If we're using memcache we need the server info.
    $memcache_version = '???';
    if (!empty($cache_accelerator) && ($cache_accelerator == 'memcached' || $cache_accelerator == 'memcache') && !empty($cache_memcached) && !empty($cacheAPI))
        $memcache_version = $cacheAPI->getVersion();

    // Check to see if we have any accelerators installed...
    if (in_array('phpa', $checkFor) && isset($_PHPA))
        $versions['phpa'] = array('title' => 'ionCube PHP-Accelerator', 'version' => $_PHPA['VERSION']);
    if (in_array('apc', $checkFor) && extension_loaded('apc'))
        $versions['apc'] = array('title' => 'Alternative PHP Cache', 'version' => phpversion('apc'));
    if (in_array('memcache', $checkFor) && function_exists('memcache_set'))
        $versions['memcache'] = array('title' => 'Memcached', 'version' => $memcache_version);
    if (in_array('xcache', $checkFor) && function_exists('xcache_set'))
        $versions['xcache'] = array('title' => 'XCache', 'version' => XCACHE_VERSION);

    if (in_array('php', $checkFor))
        $versions['php'] = array('title' => 'PHP', 'version' => PHP_VERSION, 'more' => '?action=admin;area=serversettings;sa=phpinfo');

    if (in_array('server', $checkFor))
        $versions['server'] = array('title' => $txt['support_versions_server'], 'version' => $_SERVER['SERVER_SOFTWARE']);

    return $versions;
}

/**
 * Search through source, theme and language files to determine their version.
 * Get detailed version information about the physical SMF files on the server.
 *
 * - the input parameter allows to set whether to include SSI.php and whether
 *   the results should be sorted.
 * - returns an array containing information on source files, templates and
 *   language files found in the default theme directory (grouped by language).
 *
 * @param array &$versionOptions An array of options. Can contain one or more of 'include_ssi', 'include_subscriptions', 'include_tasks' and 'sort_results'
 * @return array An array of file version info.
 */
function getFileVersions(&$versionOptions)
{
    global $boarddir, $sourcedir, $settings, $tasksdir;

    // Default place to find the languages would be the default theme dir.
    $lang_dir = $settings['default_theme_dir'] . '/languages';

    $version_info = array(
        'file_versions' => array(),
        'default_template_versions' => array(),
        'template_versions' => array(),
        'default_language_versions' => array(),
        'tasks_versions' => array(),
    );

    // Find the version in SSI.php's file header.
    if (!empty($versionOptions['include_ssi']) && file_exists($boarddir . '/SSI.php'))
    {
        $fp = fopen($boarddir . '/SSI.php', 'rb');
        $header = fread($fp, 4096);
        fclose($fp);

        // The comment looks rougly like... that.
        if (preg_match('~\*\s@version\s+(.+)[\s]{2}~i', $header, $match) == 1)
            $version_info['file_versions']['SSI.php'] = $match[1];
        // Not found!  This is bad.
        else
            $version_info['file_versions']['SSI.php'] = '??';
    }

    // Do the paid subscriptions handler?
    if (!empty($versionOptions['include_subscriptions']) && file_exists($boarddir . '/subscriptions.php'))
    {
        $fp = fopen($boarddir . '/subscriptions.php', 'rb');
        $header = fread($fp, 4096);
        fclose($fp);

        // Found it?
        if (preg_match('~\*\s@version\s+(.+)[\s]{2}~i', $header, $match) == 1)
            $version_info['file_versions']['subscriptions.php'] = $match[1];
        // If we haven't how do we all get paid?
        else
            $version_info['file_versions']['subscriptions.php'] = '??';
    }

    // Load all the files in the Sources directory, except this file and the redirect.
    $sources_dir = dir($sourcedir);
    while ($entry = $sources_dir->read())
    {
        if (substr($entry, -4) === '.php' && !is_dir($sourcedir . '/' . $entry) && $entry !== 'index.php')
        {
            // Read the first 4k from the file.... enough for the header.
            $fp = fopen($sourcedir . '/' . $entry, 'rb');
            $header = fread($fp, 4096);
            fclose($fp);

            // Look for the version comment in the file header.
            if (preg_match('~\*\s@version\s+(.+)[\s]{2}~i', $header, $match) == 1)
                $version_info['file_versions'][$entry] = $match[1];
            // It wasn't found, but the file was... show a '??'.
            else
                $version_info['file_versions'][$entry] = '??';
        }
    }
    $sources_dir->close();

    // Load all the files in the tasks directory.
    if (!empty($versionOptions['include_tasks']))
    {
        $tasks_dir = dir($tasksdir);
        while ($entry = $tasks_dir->read())
        {
            if (substr($entry, -4) === '.php' && !is_dir($tasksdir . '/' . $entry) && $entry !== 'index.php')
            {
                // Read the first 4k from the file.... enough for the header.
                $fp = fopen($tasksdir . '/' . $entry, 'rb');
                $header = fread($fp, 4096);
                fclose($fp);

                // Look for the version comment in the file header.
                if (preg_match('~\*\s@version\s+(.+)[\s]{2}~i', $header, $match) == 1)
                    $version_info['tasks_versions'][$entry] = $match[1];
                // It wasn't found, but the file was... show a '??'.
                else
                    $version_info['tasks_versions'][$entry] = '??';
            }
        }
        $tasks_dir->close();
    }

    // Load all the files in the default template directory - and the current theme if applicable.
    $directories = array('default_template_versions' => $settings['default_theme_dir']);
    if ($settings['theme_id'] != 1)
        $directories += array('template_versions' => $settings['theme_dir']);

    foreach ($directories as $type => $dirname)
    {
        $this_dir = dir($dirname);
        while ($entry = $this_dir->read())
        {
            if (substr($entry, -12) == 'template.php' && !is_dir($dirname . '/' . $entry))
            {
                // Read the first 768 bytes from the file.... enough for the header.
                $fp = fopen($dirname . '/' . $entry, 'rb');
                $header = fread($fp, 768);
                fclose($fp);

                // Look for the version comment in the file header.
                if (preg_match('~\*\s@version\s+(.+)[\s]{2}~i', $header, $match) == 1)
                    $version_info[$type][$entry] = $match[1];
                // It wasn't found, but the file was... show a '??'.
                else
                    $version_info[$type][$entry] = '??';
            }
        }
        $this_dir->close();
    }

    // Load up all the files in the default language directory and sort by language.
    $this_dir = dir($lang_dir);
    while ($entry = $this_dir->read())
    {
        if (substr($entry, -4) == '.php' && $entry != 'index.php' && !is_dir($lang_dir . '/' . $entry))
        {
            // Read the first 768 bytes from the file.... enough for the header.
            $fp = fopen($lang_dir . '/' . $entry, 'rb');
            $header = fread($fp, 768);
            fclose($fp);

            // Split the file name off into useful bits.
            list ($name, $language) = explode('.', $entry);

            // Look for the version comment in the file header.
            if (preg_match('~(?://|/\*)\s*Version:\s+(.+?);\s*' . preg_quote($name, '~') . '(?:[\s]{2}|\*/)~i', $header, $match) == 1)
                $version_info['default_language_versions'][$language][$name] = $match[1];
            // It wasn't found, but the file was... show a '??'.
            else
                $version_info['default_language_versions'][$language][$name] = '??';
        }
    }
    $this_dir->close();

    // Sort the file versions by filename.
    if (!empty($versionOptions['sort_results']))
    {
        ksort($version_info['file_versions']);
        ksort($version_info['default_template_versions']);
        ksort($version_info['template_versions']);
        ksort($version_info['default_language_versions']);
        ksort($version_info['tasks_versions']);

        // For languages sort each language too.
        foreach ($version_info['default_language_versions'] as $language => $dummy)
            ksort($version_info['default_language_versions'][$language]);
    }
    return $version_info;
}

/**
 * Update the Settings.php file.
 *
 * The most important function in this file for mod makers happens to be the
 * updateSettingsFile() function, but it shouldn't be used often anyway.
 *
 * - updates the Settings.php file with the changes supplied in config_vars.
 * - expects config_vars to be an associative array, with the keys as the
 *   variable names in Settings.php, and the values the variable values.
 * - does not escape or quote values.
 * - preserves case, formatting, and additional options in file.
 * - writes nothing if the resulting file would be less than 10 lines
 *   in length (sanity check for read lock.)
 * - check for changes to db_last_error and passes those off to a separate handler
 * - attempts to create a backup file and will use it should the writing of the
 *   new settings file fail
 *
 * @param array $config_vars An array of one or more variables to update
 */
function updateSettingsFile($config_vars)
{
    global $boarddir, $cachedir, $context;

    // Updating the db_last_error, then don't mess around with Settings.php
    if (count($config_vars) === 1 && isset($config_vars['db_last_error']))
    {
        updateDbLastError($config_vars['db_last_error']);
        return;
    }

    // When was Settings.php last changed?
    $last_settings_change = filemtime($boarddir . '/Settings.php');

    // Load the settings file.
    $settingsArray = trim(file_get_contents($boarddir . '/Settings.php'));

    // Break it up based on \r or \n, and then clean out extra characters.
    if (strpos($settingsArray, "\n") !== false)
        $settingsArray = explode("\n", $settingsArray);
    elseif (strpos($settingsArray, "\r") !== false)
        $settingsArray = explode("\r", $settingsArray);
    else
        return;

    // Presumably, the file has to have stuff in it for this function to be called :P.
    if (count($settingsArray) < 10)
        return;

    // remove any /r's that made there way in here
    foreach ($settingsArray as $k => $dummy)
        $settingsArray[$k] = strtr($dummy, array("\r" => '')) . "\n";

    // go line by line and see whats changing
    for ($i = 0, $n = count($settingsArray); $i < $n; $i++)
    {
        // Don't trim or bother with it if it's not a variable.
        if (substr($settingsArray[$i], 0, 1) != '$')
            continue;

        $settingsArray[$i] = trim($settingsArray[$i]) . "\n";

        // Look through the variables to set....
        foreach ($config_vars as $var => $val)
        {
            // be sure someone is not updating db_last_error this with a group
            if ($var === 'db_last_error')
            {
                updateDbLastError($val);
                unset($config_vars[$var]);
            }
            elseif (strncasecmp($settingsArray[$i], '$' . $var, 1 + strlen($var)) == 0)
            {
                $comment = strstr(substr($settingsArray[$i], strpos($settingsArray[$i], ';')), '#');
                $settingsArray[$i] = '$' . $var . ' = ' . $val . ';' . ($comment == '' ? '' : "\t\t" . rtrim($comment)) . "\n";

                // This one's been 'used', so to speak.
                unset($config_vars[$var]);
            }
        }

        // End of the file ... maybe
        if (substr(trim($settingsArray[$i]), 0, 2) == '?' . '>')
            $end = $i;
    }

    // This should never happen, but apparently it is happening.
    if (empty($end) || $end < 10)
        $end = count($settingsArray) - 1;

    // Still more variables to go?  Then lets add them at the end.
    if (!empty($config_vars))
    {
        if (trim($settingsArray[$end]) == '?' . '>')
            $settingsArray[$end++] = '';
        else
            $end++;

        // Add in any newly defined vars that were passed
        foreach ($config_vars as $var => $val)
            $settingsArray[$end++] = '$' . $var . ' = ' . $val . ';' . "\n";

        $settingsArray[$end] = '?' . '>';
    }
    else
        $settingsArray[$end] = trim($settingsArray[$end]);

    // Sanity error checking: the file needs to be at least 12 lines.
    if (count($settingsArray) < 12)
        return;

    // Try to avoid a few pitfalls:
    //  - like a possible race condition,
    //  - or a failure to write at low diskspace
    //
    // Check before you act: if cache is enabled, we can do a simple write test
    // to validate that we even write things on this filesystem.
    if ((empty($cachedir) || !file_exists($cachedir)) && file_exists($boarddir . '/cache'))
        $cachedir = $boarddir . '/cache';

    $test_fp = @fopen($cachedir . '/settings_update.tmp', "w+");
    if ($test_fp)
    {
        fclose($test_fp);
        $written_bytes = file_put_contents($cachedir . '/settings_update.tmp', 'test', LOCK_EX);
        @unlink($cachedir . '/settings_update.tmp');

        if ($written_bytes !== 4)
        {
            // Oops. Low disk space, perhaps. Don't mess with Settings.php then.
            // No means no. :P
            return;
        }
    }

    // Protect me from what I want! :P
    clearstatcache();
    if (filemtime($boarddir . '/Settings.php') === $last_settings_change)
    {
        // save the old before we do anything
        $settings_backup_fail = !@is_writable($boarddir . '/Settings_bak.php') || !@copy($boarddir . '/Settings.php', $boarddir . '/Settings_bak.php');
        $settings_backup_fail = !$settings_backup_fail ? (!file_exists($boarddir . '/Settings_bak.php') || filesize($boarddir . '/Settings_bak.php') === 0) : $settings_backup_fail;

        // write out the new
        $write_settings = implode('', $settingsArray);
        $written_bytes = file_put_contents($boarddir . '/Settings.php', $write_settings, LOCK_EX);

        // survey says ...
        if ($written_bytes !== strlen($write_settings) && !$settings_backup_fail)
        {
            // Well this is not good at all, lets see if we can save this
            $context['settings_message'] = 'settings_error';

            if (file_exists($boarddir . '/Settings_bak.php'))
                @copy($boarddir . '/Settings_bak.php', $boarddir . '/Settings.php');
        }
    }

    // Even though on normal installations the filemtime should prevent this being used by the installer incorrectly
    // it seems that there are times it might not. So let's MAKE it dump the cache.
    if (function_exists('opcache_invalidate'))
        opcache_invalidate($boarddir . '/Settings.php', true);
}

/**
 * Saves the time of the last db error for the error log
 * - Done separately from updateSettingsFile to avoid race conditions
 *   which can occur during a db error
 * - If it fails Settings.php will assume 0
 *
 * @param int $time The timestamp of the last DB error
 */
function updateDbLastError($time)
{
    global $boarddir, $cachedir;

    // Write out the db_last_error file with the error timestamp
    file_put_contents($cachedir . '/db_last_error.php', '<' . '?' . "php\n" . '$db_last_error = ' . $time . ';' . "\n" . '?' . '>', LOCK_EX);
    @touch($boarddir . '/' . 'Settings.php');
}

/**
 * Saves the admin's current preferences to the database.
 */
function updateAdminPreferences()
{
    global $options, $context, $smcFunc, $settings, $user_info;

    // This must exist!
    if (!isset($context['admin_preferences']))
        return false;

    // This is what we'll be saving.
    $options['admin_preferences'] = $smcFunc['json_encode']($context['admin_preferences']);

    // Just check we haven't ended up with something theme exclusive somehow.
    $smcFunc['db_query']('', '
        DELETE FROM {db_prefix}themes
        WHERE id_theme != {int:default_theme}
            AND variable = {string:admin_preferences}',
        array(
            'default_theme' => 1,
            'admin_preferences' => 'admin_preferences',
        )
    );

    // Update the themes table.
    $smcFunc['db_insert']('replace',
        '{db_prefix}themes',
        array('id_member' => 'int', 'id_theme' => 'int', 'variable' => 'string-255', 'value' => 'string-65534'),
        array($user_info['id'], 1, 'admin_preferences', $options['admin_preferences']),
        array('id_member', 'id_theme', 'variable')
    );

    // Make sure we invalidate any cache.
    cache_put_data('theme_settings-' . $settings['theme_id'] . ':' . $user_info['id'], null, 0);
}

/**
 * Send all the administrators a lovely email.
 * - loads all users who are admins or have the admin forum permission.
 * - uses the email template and replacements passed in the parameters.
 * - sends them an email.
 *
 * @param string $template Which email template to use
 * @param array $replacements An array of items to replace the variables in the template
 * @param array $additional_recipients An array of arrays of info for additional recipients. Should have 'id', 'email' and 'name' for each.
 */
function emailAdmins($template, $replacements = array(), $additional_recipients = array())
{
    global $smcFunc, $sourcedir, $language, $modSettings;

    // We certainly want this.
    require_once($sourcedir . '/Subs-Post.php');

    // Load all members which are effectively admins.
    require_once($sourcedir . '/Subs-Members.php');
    $members = membersAllowedTo('admin_forum');

    // Load their alert preferences
    require_once($sourcedir . '/Subs-Notify.php');
    $prefs = getNotifyPrefs($members, 'announcements', true);

    $request = $smcFunc['db_query']('', '
        SELECT id_member, member_name, real_name, lngfile, email_address
        FROM {db_prefix}members
        WHERE id_member IN({array_int:members})',
        array(
            'members' => $members,
        )
    );
    $emails_sent = array();
    while ($row = $smcFunc['db_fetch_assoc']($request))
    {
        if (empty($prefs[$row['id_member']]['announcements']))
            continue;

        // Stick their particulars in the replacement data.
        $replacements['IDMEMBER'] = $row['id_member'];
        $replacements['REALNAME'] = $row['member_name'];
        $replacements['USERNAME'] = $row['real_name'];

        // Load the data from the template.
        $emaildata = loadEmailTemplate($template, $replacements, empty($row['lngfile']) || empty($modSettings['userLanguage']) ? $language : $row['lngfile']);

        // Then send the actual email.
        sendmail($row['email_address'], $emaildata['subject'], $emaildata['body'], null, $template, $emaildata['is_html'], 1);

        // Track who we emailed so we don't do it twice.
        $emails_sent[] = $row['email_address'];
    }
    $smcFunc['db_free_result']($request);

    // Any additional users we must email this to?
    if (!empty($additional_recipients))
        foreach ($additional_recipients as $recipient)
        {
            if (in_array($recipient['email'], $emails_sent))
                continue;

            $replacements['IDMEMBER'] = $recipient['id'];
            $replacements['REALNAME'] = $recipient['name'];
            $replacements['USERNAME'] = $recipient['name'];

            // Load the template again.
            $emaildata = loadEmailTemplate($template, $replacements, empty($recipient['lang']) || empty($modSettings['userLanguage']) ? $language : $recipient['lang']);

            // Send off the email.
            sendmail($recipient['email'], $emaildata['subject'], $emaildata['body'], null, $template, $emaildata['is_html'], 1);
        }
}

?>