path.inc

<?php


/**
 * @file
 * Functions to handle paths in Drupal, including path aliasing.
 *
 * These functions are not loaded for cached pages, but modules that need
 * to use them in hook_boot() or hook exit() can make them available, by
 * executing "drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);".
 */

/**
 * Initialize the $_GET['q'] variable to the proper normal path.
 */
function drupal_path_initialize() {
    // Ensure $_GET['q'] is set before calling drupal_normal_path(), to support
    // path caching with hook_url_inbound_alter().
    if (empty($_GET['q'])) {
        $_GET['q'] = variable_get('site_frontpage', 'node');
    }
    $_GET['q'] = drupal_get_normal_path($_GET['q']);
}

/**
 * Given an alias, return its Drupal system URL if one exists. Given a Drupal
 * system URL return one of its aliases if such a one exists. Otherwise,
 * return FALSE.
 *
 * @param $action
 *   One of the following values:
 *   - wipe: delete the alias cache.
 *   - alias: return an alias for a given Drupal system path (if one exists).
 *   - source: return the Drupal system URL for a path alias (if one exists).
 * @param $path
 *   The path to investigate for corresponding aliases or system URLs.
 * @param $path_language
 *   Optional language code to search the path with. Defaults to the page language.
 *   If there's no path defined for that language it will search paths without
 *   language.
 *
 * @return
 *   Either a Drupal system path, an aliased path, or FALSE if no path was
 *   found.
 */
function drupal_lookup_path($action, $path = '', $path_language = NULL) {
    global $language_url;
    // Use the advanced drupal_static() pattern, since this is called very often.
    static $drupal_static_fast;
    if (!isset($drupal_static_fast)) {
        $drupal_static_fast['cache'] =& drupal_static(__FUNCTION__);
    }
    $cache =& $drupal_static_fast['cache'];
    if (!isset($cache)) {
        $cache = array(
            'map' => array(),
            'no_source' => array(),
            'whitelist' => NULL,
            'system_paths' => array(),
            'no_aliases' => array(),
            'first_call' => TRUE,
        );
    }
    // Retrieve the path alias whitelist.
    if (!isset($cache['whitelist'])) {
        $cache['whitelist'] = variable_get('path_alias_whitelist', NULL);
        if (!isset($cache['whitelist'])) {
            $cache['whitelist'] = drupal_path_alias_whitelist_rebuild();
        }
    }
    // If no language is explicitly specified we default to the current URL
    // language. If we used a language different from the one conveyed by the
    // requested URL, we might end up being unable to check if there is a path
    // alias matching the URL path.
    $path_language = $path_language ? $path_language : $language_url->language;
    if ($action == 'wipe') {
        $cache = array();
        $cache['whitelist'] = drupal_path_alias_whitelist_rebuild();
    }
    elseif ($cache['whitelist'] && $path != '') {
        if ($action == 'alias') {
            // During the first call to drupal_lookup_path() per language, load the
            // expected system paths for the page from cache.
            if (!empty($cache['first_call'])) {
                $cache['first_call'] = FALSE;
                $cache['map'][$path_language] = array();
                // Load system paths from cache.
                $cid = current_path();
                if ($cached = cache_get($cid, 'cache_path')) {
                    $cache['system_paths'] = $cached->data;
                    // Now fetch the aliases corresponding to these system paths.
                    $args = array(
                        ':system' => $cache['system_paths'],
                        ':language' => $path_language,
                        ':language_none' => LANGUAGE_NONE,
                    );
                    // Always get the language-specific alias before the language-neutral
                    // one. For example 'de' is less than 'und' so the order needs to be
                    // ASC, while 'xx-lolspeak' is more than 'und' so the order needs to
                    // be DESC. We also order by pid ASC so that fetchAllKeyed() returns
                    // the most recently created alias for each source. Subsequent queries
                    // using fetchField() must use pid DESC to have the same effect.
                    // For performance reasons, the query builder is not used here.
                    if ($path_language == LANGUAGE_NONE) {
                        // Prevent PDO from complaining about a token the query doesn't use.
                        unset($args[':language']);
                        $result = db_query('SELECT source, alias FROM {url_alias} WHERE source IN (:system) AND language = :language_none ORDER BY pid ASC', $args);
                    }
                    elseif ($path_language < LANGUAGE_NONE) {
                        $result = db_query('SELECT source, alias FROM {url_alias} WHERE source IN (:system) AND language IN (:language, :language_none) ORDER BY language ASC, pid ASC', $args);
                    }
                    else {
                        $result = db_query('SELECT source, alias FROM {url_alias} WHERE source IN (:system) AND language IN (:language, :language_none) ORDER BY language DESC, pid ASC', $args);
                    }
                    $cache['map'][$path_language] = $result->fetchAllKeyed();
                    // Keep a record of paths with no alias to avoid querying twice.
                    $cache['no_aliases'][$path_language] = array_flip(array_diff_key($cache['system_paths'], array_keys($cache['map'][$path_language])));
                }
            }
            // If the alias has already been loaded, return it.
            if (isset($cache['map'][$path_language][$path])) {
                return $cache['map'][$path_language][$path];
            }
            elseif (!isset($cache['whitelist'][strtok($path, '/')])) {
                return FALSE;
            }
            elseif (!isset($cache['no_aliases'][$path_language][$path])) {
                $args = array(
                    ':source' => $path,
                    ':language' => $path_language,
                    ':language_none' => LANGUAGE_NONE,
                );
                // See the queries above.
                if ($path_language == LANGUAGE_NONE) {
                    unset($args[':language']);
                    $alias = db_query("SELECT alias FROM {url_alias} WHERE source = :source AND language = :language_none ORDER BY pid DESC", $args)->fetchField();
                }
                elseif ($path_language > LANGUAGE_NONE) {
                    $alias = db_query("SELECT alias FROM {url_alias} WHERE source = :source AND language IN (:language, :language_none) ORDER BY language DESC, pid DESC", $args)->fetchField();
                }
                else {
                    $alias = db_query("SELECT alias FROM {url_alias} WHERE source = :source AND language IN (:language, :language_none) ORDER BY language ASC, pid DESC", $args)->fetchField();
                }
                $cache['map'][$path_language][$path] = $alias;
                return $alias;
            }
        }
        elseif ($action == 'source' && !isset($cache['no_source'][$path_language][$path])) {
            // Look for the value $path within the cached $map
            $source = FALSE;
            if (!isset($cache['map'][$path_language]) || !($source = array_search($path, $cache['map'][$path_language]))) {
                $args = array(
                    ':alias' => $path,
                    ':language' => $path_language,
                    ':language_none' => LANGUAGE_NONE,
                );
                // See the queries above.
                if ($path_language == LANGUAGE_NONE) {
                    unset($args[':language']);
                    $result = db_query("SELECT source FROM {url_alias} WHERE alias = :alias AND language = :language_none ORDER BY pid DESC", $args);
                }
                elseif ($path_language > LANGUAGE_NONE) {
                    $result = db_query("SELECT source FROM {url_alias} WHERE alias = :alias AND language IN (:language, :language_none) ORDER BY language DESC, pid DESC", $args);
                }
                else {
                    $result = db_query("SELECT source FROM {url_alias} WHERE alias = :alias AND language IN (:language, :language_none) ORDER BY language ASC, pid DESC", $args);
                }
                if ($source = $result->fetchField()) {
                    $cache['map'][$path_language][$source] = $path;
                }
                else {
                    // We can't record anything into $map because we do not have a valid
                    // index and there is no need because we have not learned anything
                    // about any Drupal path. Thus cache to $no_source.
                    $cache['no_source'][$path_language][$path] = TRUE;
                }
            }
            return $source;
        }
    }
    return FALSE;
}

/**
 * Cache system paths for a page.
 *
 * Cache an array of the system paths available on each page. We assume
 * that aliases will be needed for the majority of these paths during
 * subsequent requests, and load them in a single query during
 * drupal_lookup_path().
 */
function drupal_cache_system_paths() {
    // Check if the system paths for this page were loaded from cache in this
    // request to avoid writing to cache on every request.
    $cache =& drupal_static('drupal_lookup_path', array());
    if (empty($cache['system_paths']) && !empty($cache['map'])) {
        // Generate a cache ID (cid) specifically for this page.
        $cid = current_path();
        // The static $map array used by drupal_lookup_path() includes all
        // system paths for the page request.
        if ($paths = current($cache['map'])) {
            $data = array_keys($paths);
            $expire = REQUEST_TIME + 60 * 60 * 24;
            cache_set($cid, $data, 'cache_path', $expire);
        }
    }
}

/**
 * Given an internal Drupal path, return the alias set by the administrator.
 *
 * If no path is provided, the function will return the alias of the current
 * page.
 *
 * @param $path
 *   An internal Drupal path.
 * @param $path_language
 *   An optional language code to look up the path in.
 *
 * @return
 *   An aliased path if one was found, or the original path if no alias was
 *   found.
 */
function drupal_get_path_alias($path = NULL, $path_language = NULL) {
    // If no path is specified, use the current page's path.
    if ($path == NULL) {
        $path = $_GET['q'];
    }
    $result = $path;
    if ($alias = drupal_lookup_path('alias', $path, $path_language)) {
        $result = $alias;
    }
    return $result;
}

/**
 * Given a path alias, return the internal path it represents.
 *
 * @param $path
 *   A Drupal path alias.
 * @param $path_language
 *   An optional language code to look up the path in.
 *
 * @return
 *   The internal path represented by the alias, or the original alias if no
 *   internal path was found.
 */
function drupal_get_normal_path($path, $path_language = NULL) {
    $original_path = $path;
    // Lookup the path alias first.
    if ($source = drupal_lookup_path('source', $path, $path_language)) {
        $path = $source;
    }
    // Allow other modules to alter the inbound URL. We cannot use drupal_alter()
    // here because we need to run hook_url_inbound_alter() in the reverse order
    // of hook_url_outbound_alter().
    foreach (array_reverse(module_implements('url_inbound_alter')) as $module) {
        $function = $module . '_url_inbound_alter';
        $function($path, $original_path, $path_language);
    }
    return $path;
}

/**
 * Check if the current page is the front page.
 *
 * @return
 *   Boolean value: TRUE if the current page is the front page; FALSE if otherwise.
 */
function drupal_is_front_page() {
    // Use the advanced drupal_static() pattern, since this is called very often.
    static $drupal_static_fast;
    if (!isset($drupal_static_fast)) {
        $drupal_static_fast['is_front_page'] =& drupal_static(__FUNCTION__);
    }
    $is_front_page =& $drupal_static_fast['is_front_page'];
    if (!isset($is_front_page)) {
        // As drupal_path_initialize updates $_GET['q'] with the 'site_frontpage' path,
        // we can check it against the 'site_frontpage' variable.
        $is_front_page = $_GET['q'] == variable_get('site_frontpage', 'node');
    }
    return $is_front_page;
}

/**
 * Check if a path matches any pattern in a set of patterns.
 *
 * @param $path
 *   The path to match.
 * @param $patterns
 *   String containing a set of patterns separated by \n, \r or \r\n.
 *
 * @return
 *   Boolean value: TRUE if the path matches a pattern, FALSE otherwise.
 */
function drupal_match_path($path, $patterns) {
    $regexps =& drupal_static(__FUNCTION__);
    if (!isset($regexps[$patterns])) {
        // Convert path settings to a regular expression.
        // Therefore replace newlines with a logical or, /* with asterisks and the <front> with the frontpage.
        $to_replace = array(
            '/(\\r\\n?|\\n)/',
            // newlines
'/\\\\\\*/',
            // asterisks
'/(^|\\|)\\\\<front\\\\>($|\\|)/',
        );
        $replacements = array(
            '|',
            '.*',
            '\\1' . preg_quote(variable_get('site_frontpage', 'node'), '/') . '\\2',
        );
        $patterns_quoted = preg_quote($patterns, '/');
        $regexps[$patterns] = '/^(' . preg_replace($to_replace, $replacements, $patterns_quoted) . ')$/';
    }
    return (bool) preg_match($regexps[$patterns], $path);
}

/**
 * Return the current URL path of the page being viewed.
 *
 * Examples:
 * - http://example.com/node/306 returns "node/306".
 * - http://example.com/drupalfolder/node/306 returns "node/306" while
 *   base_path() returns "/drupalfolder/".
 * - http://example.com/path/alias (which is a path alias for node/306) returns
 *   "node/306" as opposed to the path alias.
 *
 * This function is not available in hook_boot() so use $_GET['q'] instead.
 * However, be careful when doing that because in the case of Example #3
 * $_GET['q'] will contain "path/alias". If "node/306" is needed, calling
 * drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL) makes this function available.
 *
 * @return
 *   The current Drupal URL path. The path is untrusted user input and must be
 *   treated as such.
 *
 * @see request_path()
 */
function current_path() {
    return $_GET['q'];
}

/**
 * Rebuild the path alias white list.
 *
 * @param $source
 *   An optional system path for which an alias is being inserted.
 *
 * @return
 *   An array containing a white list of path aliases.
 */
function drupal_path_alias_whitelist_rebuild($source = NULL) {
    // When paths are inserted, only rebuild the whitelist if the system path
    // has a top level component which is not already in the whitelist.
    if (!empty($source)) {
        $whitelist = variable_get('path_alias_whitelist', NULL);
        if (isset($whitelist[strtok($source, '/')])) {
            return $whitelist;
        }
    }
    // For each alias in the database, get the top level component of the system
    // path it corresponds to. This is the portion of the path before the first
    // '/', if present, otherwise the whole path itself.
    $whitelist = array();
    $result = db_query("SELECT DISTINCT SUBSTRING_INDEX(source, '/', 1) AS path FROM {url_alias}");
    foreach ($result as $row) {
        $whitelist[$row->path] = TRUE;
    }
    variable_set('path_alias_whitelist', $whitelist);
    return $whitelist;
}

/**
 * Fetches a specific URL alias from the database.
 *
 * @param $conditions
 *   A string representing the source, a number representing the pid, or an
 *   array of query conditions.
 *
 * @return
 *   FALSE if no alias was found or an associative array containing the
 *   following keys:
 *   - source: The internal system path.
 *   - alias: The URL alias.
 *   - pid: Unique path alias identifier.
 *   - language: The language of the alias.
 */
function path_load($conditions) {
    if (is_numeric($conditions)) {
        $conditions = array(
            'pid' => $conditions,
        );
    }
    elseif (is_string($conditions)) {
        $conditions = array(
            'source' => $conditions,
        );
    }
    elseif (!is_array($conditions)) {
        return FALSE;
    }
    $select = db_select('url_alias');
    foreach ($conditions as $field => $value) {
        $select->condition($field, $value);
    }
    return $select->fields('url_alias')
        ->orderBy('pid', 'DESC')
        ->range(0, 1)
        ->execute()
        ->fetchAssoc();
}

/**
 * Save a path alias to the database.
 *
 * @param $path
 *   An associative array containing the following keys:
 *   - source: The internal system path.
 *   - alias: The URL alias.
 *   - pid: (optional) Unique path alias identifier.
 *   - language: (optional) The language of the alias.
 */
function path_save(&$path) {
    $path += array(
        'language' => LANGUAGE_NONE,
    );
    // Load the stored alias, if any.
    if (!empty($path['pid']) && !isset($path['original'])) {
        $path['original'] = path_load($path['pid']);
    }
    if (empty($path['pid'])) {
        drupal_write_record('url_alias', $path);
        module_invoke_all('path_insert', $path);
    }
    else {
        drupal_write_record('url_alias', $path, array(
            'pid',
        ));
        module_invoke_all('path_update', $path);
    }
    // Clear internal properties.
    unset($path['original']);
    // Clear the static alias cache.
    drupal_clear_path_cache($path['source']);
}

/**
 * Delete a URL alias.
 *
 * @param $criteria
 *   A number representing the pid or an array of criteria.
 */
function path_delete($criteria) {
    if (!is_array($criteria)) {
        $criteria = array(
            'pid' => $criteria,
        );
    }
    $path = path_load($criteria);
    if (isset($path['source'])) {
        $query = db_delete('url_alias');
        foreach ($criteria as $field => $value) {
            $query->condition($field, $value);
        }
        $query->execute();
        module_invoke_all('path_delete', $path);
        drupal_clear_path_cache($path['source']);
    }
}

/**
 * Determines whether a path is in the administrative section of the site.
 *
 * By default, paths are considered to be non-administrative. If a path does
 * not match any of the patterns in path_get_admin_paths(), or if it matches
 * both administrative and non-administrative patterns, it is considered
 * non-administrative.
 *
 * @param $path
 *   A Drupal path.
 *
 * @return
 *   TRUE if the path is administrative, FALSE otherwise.
 *
 * @see path_get_admin_paths()
 * @see hook_admin_paths()
 * @see hook_admin_paths_alter()
 */
function path_is_admin($path) {
    $path_map =& drupal_static(__FUNCTION__);
    if (!isset($path_map['admin'][$path])) {
        $patterns = path_get_admin_paths();
        $path_map['admin'][$path] = drupal_match_path($path, $patterns['admin']);
        $path_map['non_admin'][$path] = drupal_match_path($path, $patterns['non_admin']);
    }
    return $path_map['admin'][$path] && !$path_map['non_admin'][$path];
}

/**
 * Gets a list of administrative and non-administrative paths.
 *
 * @return array
 *   An associative array containing the following keys:
 *   'admin': An array of administrative paths and regular expressions
 *            in a format suitable for drupal_match_path().
 *   'non_admin': An array of non-administrative paths and regular expressions.
 *
 * @see hook_admin_paths()
 * @see hook_admin_paths_alter()
 */
function path_get_admin_paths() {
    $patterns =& drupal_static(__FUNCTION__);
    if (!isset($patterns)) {
        $paths = module_invoke_all('admin_paths');
        drupal_alter('admin_paths', $paths);
        // Combine all admin paths into one array, and likewise for non-admin paths,
        // for easier handling.
        $patterns = array();
        $patterns['admin'] = array();
        $patterns['non_admin'] = array();
        foreach ($paths as $path => $enabled) {
            if ($enabled) {
                $patterns['admin'][] = $path;
            }
            else {
                $patterns['non_admin'][] = $path;
            }
        }
        $patterns['admin'] = implode("\n", $patterns['admin']);
        $patterns['non_admin'] = implode("\n", $patterns['non_admin']);
    }
    return $patterns;
}

/**
 * Checks a path exists and the current user has access to it.
 *
 * @param $path
 *   The path to check.
 * @param $dynamic_allowed
 *   Whether paths with menu wildcards (like user/%) should be allowed.
 *
 * @return
 *   TRUE if it is a valid path AND the current user has access permission,
 *   FALSE otherwise.
 */
function drupal_valid_path($path, $dynamic_allowed = FALSE) {
    global $menu_admin;
    // We indicate that a menu administrator is running the menu access check.
    $menu_admin = TRUE;
    if ($path == '<front>' || url_is_external($path)) {
        $item = array(
            'access' => TRUE,
        );
    }
    elseif ($dynamic_allowed && preg_match('/\\/\\%/', $path)) {
        // Path is dynamic (ie 'user/%'), so check directly against menu_router table.
        if ($item = db_query("SELECT * FROM {menu_router} where path = :path", array(
            ':path' => $path,
        ))->fetchAssoc()) {
            $item['link_path'] = $item['path'];
            $item['link_title'] = $item['title'];
            $item['external'] = FALSE;
            $item['options'] = '';
            _menu_link_translate($item);
        }
    }
    else {
        $item = menu_get_item($path);
    }
    $menu_admin = FALSE;
    return $item && $item['access'];
}

/**
 * Clear the path cache.
 *
 * @param $source
 *   An optional system path for which an alias is being changed.
 */
function drupal_clear_path_cache($source = NULL) {
    // Clear the drupal_lookup_path() static cache.
    drupal_static_reset('drupal_lookup_path');
    drupal_path_alias_whitelist_rebuild($source);
}