File Sources/Subs-Themes.php

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<?php

/**
 * Helper file for handling themes.
 *
 * Simple Machines Forum (SMF)
 *
 * @package SMF
 * @author Simple Machines https://www.simplemachines.org
 * @copyright 2020 Simple Machines and individual contributors
 * @license https://www.simplemachines.org/about/smf/license.php BSD
 *
 * @version 2.1 RC2
 */

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

/**
 * Gets a single theme's info.
 *
 * @param int $id The theme ID to get the info from.
 * @return array The theme info as an array.
 */
function get_single_theme($id)
{
    global $smcFunc, $modSettings;

    // No data, no fun!
    if (empty($id))
        return false;

    // Make sure $id is an int.
    $id = (int) $id;

    // List of all possible  values.
    $themeValues = array(
        'theme_dir',
        'images_url',
        'theme_url',
        'name',
        'theme_layers',
        'theme_templates',
        'version',
        'install_for',
        'based_on',
    );

    // Make changes if you really want it.
    call_integration_hook('integrate_get_single_theme', array(&$themeValues, $id));

    $single = array(
        'id' => $id,
    );

    // Make our known/enable themes a little easier to work with.
    $knownThemes = !empty($modSettings['knownThemes']) ? explode(',', $modSettings['knownThemes']) : array();
    $enableThemes = !empty($modSettings['enableThemes']) ? explode(',', $modSettings['enableThemes']) : array();

    $request = $smcFunc['db_query']('', '
        SELECT id_theme, variable, value
        FROM {db_prefix}themes
        WHERE variable IN ({array_string:theme_values})
            AND id_theme = ({int:id_theme})
            AND id_member = {int:no_member}',
        array(
            'theme_values' => $themeValues,
            'id_theme' => $id,
            'no_member' => 0,
        )
    );

    while ($row = $smcFunc['db_fetch_assoc']($request))
    {
        $single[$row['variable']] = $row['value'];

        // Fix the path and tell if its a valid one.
        if ($row['variable'] == 'theme_dir')
        {
            $single['theme_dir'] = realpath($row['value']);
            $single['valid_path'] = file_exists($row['value']) && is_dir($row['value']);
        }
    }

    // Is this theme installed and enabled?
    $single['known'] = in_array($single['id'], $knownThemes);
    $single['enable'] = in_array($single['id'], $enableThemes);

    // It should at least return if the theme is a known one or if its enable.
    return $single;
}

/**
 * Loads and returns all installed themes.
 *
 * Stores all themes on $context['themes'] for easier use.
 *
 * $modSettings['knownThemes'] stores themes that the user is able to select.
 *
 * @param bool $enable_only Whether to fetch only enabled themes. Default is false.
 */
function get_all_themes($enable_only = false)
{
    global $modSettings, $context, $smcFunc;

    // Make our known/enable themes a little easier to work with.
    $knownThemes = !empty($modSettings['knownThemes']) ? explode(',', $modSettings['knownThemes']) : array();
    $enableThemes = !empty($modSettings['enableThemes']) ? explode(',', $modSettings['enableThemes']) : array();

    // List of all possible themes values.
    $themeValues = array(
        'theme_dir',
        'images_url',
        'theme_url',
        'name',
        'theme_layers',
        'theme_templates',
        'version',
        'install_for',
        'based_on',
    );

    // Make changes if you really want it.
    call_integration_hook('integrate_get_all_themes', array(&$themeValues, $enable_only));

    // So, what is it going to be?
    $query_where = $enable_only ? $enableThemes : $knownThemes;

    // Perform the query as requested.
    $request = $smcFunc['db_query']('', '
        SELECT id_theme, variable, value
        FROM {db_prefix}themes
        WHERE variable IN ({array_string:theme_values})
            AND id_theme IN ({array_string:query_where})
            AND id_member = {int:no_member}',
        array(
            'query_where' => $query_where,
            'theme_values' => $themeValues,
            'no_member' => 0,
        )
    );

    $context['themes'] = array();

    while ($row = $smcFunc['db_fetch_assoc']($request))
    {
        $context['themes'][$row['id_theme']]['id'] = (int) $row['id_theme'];

        // Fix the path and tell if its a valid one.
        if ($row['variable'] == 'theme_dir')
        {
            $context['themes'][$row['id_theme']][$row['variable']] = realpath($row['value']);
            $context['themes'][$row['id_theme']]['valid_path'] = file_exists(realpath($row['value'])) && is_dir(realpath($row['value']));
        }

        $context['themes'][$row['id_theme']]['known'] = in_array($row['id_theme'], $knownThemes);
        $context['themes'][$row['id_theme']]['enable'] = in_array($row['id_theme'], $enableThemes);
        $context['themes'][$row['id_theme']][$row['variable']] = $row['value'];
    }

    $smcFunc['db_free_result']($request);
}

/**
 * Loads and returns all installed themes.
 *
 * Stores all themes on $context['themes'] for easier use.
 *
 * $modSettings['knownThemes'] stores themes that the user is able to select.
 */
function get_installed_themes()
{
    global $modSettings, $context, $smcFunc;

    // Make our known/enable themes a little easier to work with.
    $knownThemes = !empty($modSettings['knownThemes']) ? explode(',', $modSettings['knownThemes']) : array();
    $enableThemes = !empty($modSettings['enableThemes']) ? explode(',', $modSettings['enableThemes']) : array();

    // List of all possible themes values.
    $themeValues = array(
        'theme_dir',
        'images_url',
        'theme_url',
        'name',
        'theme_layers',
        'theme_templates',
        'version',
        'install_for',
        'based_on',
    );

    // Make changes if you really want it.
    call_integration_hook('integrate_get_installed_themes', array(&$themeValues));

    // Perform the query as requested.
    $request = $smcFunc['db_query']('', '
        SELECT id_theme, variable, value
        FROM {db_prefix}themes
        WHERE variable IN ({array_string:theme_values})
            AND id_member = {int:no_member}',
        array(
            'theme_values' => $themeValues,
            'no_member' => 0,
        )
    );

    $context['themes'] = array();

    while ($row = $smcFunc['db_fetch_assoc']($request))
    {
        $context['themes'][$row['id_theme']]['id'] = (int) $row['id_theme'];

        // Fix the path and tell if its a valid one.
        if ($row['variable'] == 'theme_dir')
        {
            $context['themes'][$row['id_theme']][$row['variable']] = realpath($row['value']);
            $context['themes'][$row['id_theme']]['valid_path'] = file_exists(realpath($row['value'])) && is_dir(realpath($row['value']));
        }

        $context['themes'][$row['id_theme']]['known'] = in_array($row['id_theme'], $knownThemes);
        $context['themes'][$row['id_theme']]['enable'] = in_array($row['id_theme'], $enableThemes);
        $context['themes'][$row['id_theme']][$row['variable']] = $row['value'];
    }

    $smcFunc['db_free_result']($request);
}

/**
 * Reads an .xml file and returns the data as an array
 *
 * Removes the entire theme if the .xml file couldn't be found or read.
 *
 * @param string $path The absolute path to the xml file.
 * @return array An array with all the info extracted from the xml file.
 */
function get_theme_info($path)
{
    global $smcFunc, $sourcedir, $txt, $scripturl, $context;
    global $explicit_images;

    if (empty($path))
        return false;

    $xml_data = array();
    $explicit_images = false;

    // Perhaps they are trying to install a mod, lets tell them nicely this is the wrong function.
    if (file_exists($path . '/package-info.xml'))
    {
        loadLanguage('Errors');

        // We need to delete the dir otherwise the next time you try to install a theme you will get the same error.
        remove_dir($path);

        $txt['package_get_error_is_mod'] = str_replace('{MANAGEMODURL}', $scripturl . '?action=admin;area=packages;' . $context['session_var'] . '=' . $context['session_id'], $txt['package_get_error_is_mod']);
        fatal_lang_error('package_theme_upload_error_broken', false, $txt['package_get_error_is_mod']);
    }

    // Parse theme-info.xml into an xmlArray.
    require_once($sourcedir . '/Class-Package.php');
    $theme_info_xml = new xmlArray(file_get_contents($path . '/theme_info.xml'));

    // Error message, there isn't any valid info.
    if (!$theme_info_xml->exists('theme-info[0]'))
    {
        remove_dir($path);
        fatal_lang_error('package_get_error_packageinfo_corrupt', false);
    }

    // Check for compatibility with 2.1 or greater.
    if (!$theme_info_xml->exists('theme-info/install'))
    {
        remove_dir($path);
        fatal_lang_error('package_get_error_theme_not_compatible', false, SMF_FULL_VERSION);
    }

    // So, we have an install tag which is cool and stuff but we also need to check it and match your current SMF version...
    $the_version = SMF_VERSION;
    $install_versions = $theme_info_xml->path('theme-info/install/@for');

    // The theme isn't compatible with the current SMF version.
    if (!$install_versions || !matchPackageVersion($the_version, $install_versions))
    {
        remove_dir($path);
        fatal_lang_error('package_get_error_theme_not_compatible', false, SMF_FULL_VERSION);
    }

    $theme_info_xml = $theme_info_xml->path('theme-info[0]');
    $theme_info_xml = $theme_info_xml->to_array();

    $xml_elements = array(
        'theme_layers' => 'layers',
        'theme_templates' => 'templates',
        'based_on' => 'based-on',
        'version' => 'version',
    );

    // Assign the values to be stored.
    foreach ($xml_elements as $var => $name)
        if (!empty($theme_info_xml[$name]))
            $xml_data[$var] = $theme_info_xml[$name];

    // Add the supported versions.
    $xml_data['install_for'] = $install_versions;

    // Overwrite the default images folder.
    if (!empty($theme_info_xml['images']))
    {
        $xml_data['images_url'] = $path . '/' . $theme_info_xml['images'];
        $explicit_images = true;
    }

    if (!empty($theme_info_xml['extra']))
        $xml_data += $smcFunc['json_decode']($theme_info_xml['extra'], true);

    return $xml_data;
}

/**
 * Inserts a theme's data to the DataBase.
 *
 * Ends execution with fatal_lang_error() if an error appears.
 *
 * @param array $to_install An array containing all values to be stored into the DB.
 * @return int The newly created theme ID.
 */
function theme_install($to_install = array())
{
    global $smcFunc, $context, $modSettings;
    global $settings, $explicit_images;

    // External use? no problem!
    if ($to_install)
        $context['to_install'] = $to_install;

    // One last check.
    if (empty($context['to_install']['theme_dir']) || basename($context['to_install']['theme_dir']) == 'Themes')
        fatal_lang_error('theme_install_invalid_dir', false);

    // OK, is this a newer version of an already installed theme?
    if (!empty($context['to_install']['version']))
    {
        $request = $smcFunc['db_query']('', '
            SELECT id_theme, variable, value
            FROM {db_prefix}themes
            WHERE id_member = {int:no_member}
                AND variable = {string:name}
                AND value LIKE {string:name_value}
            LIMIT 1',
            array(
                'no_member' => 0,
                'name' => 'name',
                'version' => 'version',
                'name_value' => '%' . $context['to_install']['name'] . '%',
            )
        );

        $to_update = $smcFunc['db_fetch_assoc']($request);
        $smcFunc['db_free_result']($request);

        // Got something, lets figure it out what to do next.
        if (!empty($to_update) && !empty($to_update['version']))
            switch (compareVersions($context['to_install']['version'], $to_update['version']))
            {
                case 1: // Got a newer version, update the old entry.
                    $smcFunc['db_query']('', '
                        UPDATE {db_prefix}themes
                        SET value = {string:new_value}
                        WHERE variable = {string:version}
                            AND id_theme = {int:id_theme}',
                        array(
                            'new_value' => $context['to_install']['version'],
                            'version' => 'version',
                            'id_theme' => $to_update['id_theme'],
                        )
                    );

                    // Done with the update, tell the user about it.
                    $context['to_install']['updated'] = true;

                    return $to_update['id_theme'];
                    break; // Just for reference.
                case 0: // This is exactly the same theme.
                case -1: // The one being installed is older than the one already installed.
                default: // Any other possible result.
                    fatal_lang_error('package_get_error_theme_no_new_version', false, array($context['to_install']['version'], $to_update['version']));
            }
    }

    if (!empty($context['to_install']['based_on']))
    {
        // No need for elaborated stuff when the theme is based on the default one.
        if ($context['to_install']['based_on'] == 'default')
        {
            $context['to_install']['theme_url'] = $settings['default_theme_url'];
            $context['to_install']['images_url'] = $settings['default_images_url'];
        }

        // Custom theme based on another custom theme, lets get some info.
        elseif ($context['to_install']['based_on'] != '')
        {
            $context['to_install']['based_on'] = preg_replace('~[^A-Za-z0-9\-_ ]~', '', $context['to_install']['based_on']);

            // Get the theme info first.
            $request = $smcFunc['db_query']('', '
                SELECT id_theme
                FROM {db_prefix}themes
                WHERE id_member = {int:no_member}
                    AND (value LIKE {string:based_on} OR value LIKE {string:based_on_path})
                LIMIT 1',
                array(
                    'no_member' => 0,
                    'based_on' => '%/' . $context['to_install']['based_on'],
                    'based_on_path' => '%' . "\\" . $context['to_install']['based_on'],
                )
            );

            $based_on = $smcFunc['db_fetch_assoc']($request);
            $smcFunc['db_free_result']($request);

            $request = $smcFunc['db_query']('', '
                SELECT variable, value
                FROM {db_prefix}themes
                WHERE variable IN ({array_string:theme_values})
                    AND id_theme = ({int:based_on})
                LIMIT 1',
                array(
                    'no_member' => 0,
                    'theme__values' => array('theme_url', 'images_url', 'theme_dir',),
                    'based_on' => $based_on['id_theme'],
                )
            );
            $temp = $smcFunc['db_fetch_assoc']($request);
            $smcFunc['db_free_result']($request);

            // Found the based on theme info, add it to the current one being installed.
            if (is_array($temp))
            {
                $context['to_install']['base_theme_url'] = $temp['theme_url'];
                $context['to_install']['base_theme_dir'] = $temp['theme_dir'];

                if (empty($explicit_images) && !empty($context['to_install']['base_theme_url']))
                    $context['to_install']['theme_url'] = $context['to_install']['base_theme_url'];
            }

            // Nope, sorry, couldn't find any theme already installed.
            else
                fatal_lang_error('package_get_error_theme_no_based_on_found', false, $context['to_install']['based_on']);
        }

        unset($context['to_install']['based_on']);
    }

    // Find the newest id_theme.
    $result = $smcFunc['db_query']('', '
        SELECT MAX(id_theme)
        FROM {db_prefix}themes',
        array(
        )
    );
    list ($id_theme) = $smcFunc['db_fetch_row']($result);
    $smcFunc['db_free_result']($result);

    // This will be theme number...
    $id_theme++;

    // Last minute changes? although, the actual array is a context value you might want to use the new ID.
    call_integration_hook('integrate_theme_install', array(&$context['to_install'], $id_theme));

    $inserts = array();
    foreach ($context['to_install'] as $var => $val)
        $inserts[] = array($id_theme, $var, $val);

    if (!empty($inserts))
        $smcFunc['db_insert']('insert',
            '{db_prefix}themes',
            array('id_theme' => 'int', 'variable' => 'string-255', 'value' => 'string-65534'),
            $inserts,
            array('id_theme', 'variable')
        );

    // Update the known and enable Theme's settings.
    $known = strtr($modSettings['knownThemes'] . ',' . $id_theme, array(',,' => ','));
    $enable = strtr($modSettings['enableThemes'] . ',' . $id_theme, array(',,' => ','));
    updateSettings(array('knownThemes' => $known, 'enableThemes' => $enable));

    return $id_theme;
}

/**
 * Removes a directory from the themes dir.
 *
 * This is a recursive function, it will call itself if there are subdirs inside the main directory.
 *
 * @param string $path The absolute path to the directory to be removed
 * @return bool true when success, false on error.
 */
function remove_dir($path)
{
    if (empty($path))
        return false;

    if (is_dir($path))
    {
        $objects = scandir($path);

        foreach ($objects as $object)
            if ($object != '.' && $object != '..')
            {
                if (filetype($path . '/' . $object) == 'dir')
                    remove_dir($path . '/' . $object);

                else
                    unlink($path . '/' . $object);
            }
    }

    reset($objects);
    rmdir($path);
}

/**
 * Removes a theme from the DB, includes all possible places where the theme might be used.
 *
 * @param int $themeID The theme ID
 * @return bool true when success, false on error.
 */
function remove_theme($themeID)
{
    global $smcFunc, $modSettings;

    // Can't delete the default theme, sorry!
    if (empty($themeID) || $themeID == 1)
        return false;

    $known = explode(',', $modSettings['knownThemes']);
    $enable = explode(',', $modSettings['enableThemes']);

    // Remove it from the themes table.
    $smcFunc['db_query']('', '
        DELETE FROM {db_prefix}themes
        WHERE id_theme = {int:current_theme}',
        array(
            'current_theme' => $themeID,
        )
    );

    // Update users preferences.
    $smcFunc['db_query']('', '
        UPDATE {db_prefix}members
        SET id_theme = {int:default_theme}
        WHERE id_theme = {int:current_theme}',
        array(
            'default_theme' => 0,
            'current_theme' => $themeID,
        )
    );

    // Some boards may have it as preferred theme.
    $smcFunc['db_query']('', '
        UPDATE {db_prefix}boards
        SET id_theme = {int:default_theme}
        WHERE id_theme = {int:current_theme}',
        array(
            'default_theme' => 0,
            'current_theme' => $themeID,
        )
    );

    // Remove it from the list of known themes.
    $known = array_diff($known, array($themeID));

    // And the enable list too.
    $enable = array_diff($enable, array($themeID));

    // Back to good old comma separated string.
    $known = strtr(implode(',', $known), array(',,' => ','));
    $enable = strtr(implode(',', $enable), array(',,' => ','));

    // Update the enableThemes list.
    updateSettings(array('enableThemes' => $enable, 'knownThemes' => $known));

    // Fix it if the theme was the overall default theme.
    if ($modSettings['theme_guests'] == $themeID)
        updateSettings(array('theme_guests' => '1'));

    return true;
}

/**
 * Generates a file listing for a given directory
 *
 * @param string $path The full path to the directory
 * @param string $relative The relative path (relative to the Themes directory)
 * @return array An array of information about the files and directories found
 */
function get_file_listing($path, $relative)
{
    global $scripturl, $txt, $context;

    // Is it even a directory?
    if (!is_dir($path))
        fatal_lang_error('error_invalid_dir', 'critical');

    $dir = dir($path);
    $entries = array();
    while ($entry = $dir->read())
        $entries[] = $entry;
    $dir->close();

    natcasesort($entries);

    $listing1 = array();
    $listing2 = array();

    foreach ($entries as $entry)
    {
        // Skip all dot files, including .htaccess.
        if (substr($entry, 0, 1) == '.' || $entry == 'CVS')
            continue;

        if (is_dir($path . '/' . $entry))
            $listing1[] = array(
                'filename' => $entry,
                'is_writable' => is_writable($path . '/' . $entry),
                'is_directory' => true,
                'is_template' => false,
                'is_image' => false,
                'is_editable' => false,
                'href' => $scripturl . '?action=admin;area=theme;th=' . $_GET['th'] . ';' . $context['session_var'] . '=' . $context['session_id'] . ';sa=edit;directory=' . $relative . $entry,
                'size' => '',
            );
        else
        {
            $size = filesize($path . '/' . $entry);
            if ($size > 2048 || $size == 1024)
                $size = comma_format($size / 1024) . ' ' . $txt['themeadmin_edit_kilobytes'];
            else
                $size = comma_format($size) . ' ' . $txt['themeadmin_edit_bytes'];

            $listing2[] = array(
                'filename' => $entry,
                'is_writable' => is_writable($path . '/' . $entry),
                'is_directory' => false,
                'is_template' => preg_match('~\.template\.php$~', $entry) != 0,
                'is_image' => preg_match('~\.(jpg|jpeg|gif|bmp|png)$~', $entry) != 0,
                'is_editable' => is_writable($path . '/' . $entry) && preg_match('~\.(php|pl|css|js|vbs|xml|xslt|txt|xsl|html|htm|shtm|shtml|asp|aspx|cgi|py)$~', $entry) != 0,
                'href' => $scripturl . '?action=admin;area=theme;th=' . $_GET['th'] . ';' . $context['session_var'] . '=' . $context['session_id'] . ';sa=edit;filename=' . $relative . $entry,
                'size' => $size,
                'last_modified' => timeformat(filemtime($path . '/' . $entry)),
            );
        }
    }

    return array_merge($listing1, $listing2);
}

?>

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