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- <?php
- // $Id: session.inc,v 1.44.2.1 2008/02/07 11:58:40 goba Exp $
-
- /**
- * @file
- * User session handling functions.
- */
-
- function sess_open($save_path, $session_name) {
- return TRUE;
- }
-
- function sess_close() {
- return TRUE;
- }
-
- function sess_read($key) {
- global $user;
-
- // Write and Close handlers are called after destructing objects since PHP 5.0.5
- // Thus destructors can use sessions but session handler can't use objects.
- // So we are moving session closure before destructing objects.
- register_shutdown_function('session_write_close');
-
- // Handle the case of first time visitors and clients that don't store cookies (eg. web crawlers).
- if (!isset($_COOKIE[session_name()])) {
- $user = drupal_anonymous_user();
- return '';
- }
-
- // Otherwise, if the session is still active, we have a record of the client's session in the database.
- $user = db_fetch_object(db_query("SELECT u.*, s.* FROM {users} u INNER JOIN {sessions} s ON u.uid = s.uid WHERE s.sid = '%s'", $key));
-
- // We found the client's session record and they are an authenticated user
- if ($user && $user->uid > 0) {
- // This is done to unserialize the data member of $user
- $user = drupal_unpack($user);
-
- // Add roles element to $user
- $user->roles = array();
- $user->roles[DRUPAL_AUTHENTICATED_RID] = 'authenticated user';
- $result = db_query("SELECT r.rid, r.name FROM {role} r INNER JOIN {users_roles} ur ON ur.rid = r.rid WHERE ur.uid = %d", $user->uid);
- while ($role = db_fetch_object($result)) {
- $user->roles[$role->rid] = $role->name;
- }
- }
- // We didn't find the client's record (session has expired), or they are an anonymous user.
- else {
- $session = isset($user->session) ? $user->session : '';
- $user = drupal_anonymous_user($session);
- }
-
- return $user->session;
- }
-
- function sess_write($key, $value) {
- global $user;
-
- // If saving of session data is disabled or if the client doesn't have a session,
- // and one isn't being created ($value), do nothing.
- if (!session_save_session() || (empty($_COOKIE[session_name()]) && empty($value))) {
- return TRUE;
- }
-
- $result = db_result(db_query("SELECT COUNT(*) FROM {sessions} WHERE sid = '%s'", $key));
-
- if (!$result) {
- // Only save session data when when the browser sends a cookie. This keeps
- // crawlers out of session table. This reduces memory and server load,
- // and gives more useful statistics. We can't eliminate anonymous session
- // table rows without breaking throttle module and "Who's Online" block.
- if ($user->uid || $value || count($_COOKIE)) {
- db_query("INSERT INTO {sessions} (sid, uid, cache, hostname, session, timestamp) VALUES ('%s', %d, %d, '%s', '%s', %d)", $key, $user->uid, isset($user->cache) ? $user->cache : '', ip_address(), $value, time());
- }
- }
- else {
- db_query("UPDATE {sessions} SET uid = %d, cache = %d, hostname = '%s', session = '%s', timestamp = %d WHERE sid = '%s'", $user->uid, isset($user->cache) ? $user->cache : '', ip_address(), $value, time(), $key);
-
- // Last access time is updated no more frequently than once every 180 seconds.
- // This reduces contention in the users table.
- if ($user->uid && time() - $user->access > variable_get('session_write_interval', 180)) {
- db_query("UPDATE {users} SET access = %d WHERE uid = %d", time(), $user->uid);
- }
- }
-
- return TRUE;
- }
-
- /**
- * Called when an anonymous user becomes authenticated or vice-versa.
- */
- function sess_regenerate() {
- $old_session_id = session_id();
-
- // We code around http://bugs.php.net/bug.php?id=32802 by destroying
- // the session cookie by setting expiration in the past (a negative
- // value). This issue only arises in PHP versions before 4.4.0,
- // regardless of the Drupal configuration.
- // TODO: remove this when we require at least PHP 4.4.0
- if (isset($_COOKIE[session_name()])) {
- setcookie(session_name(), '', time() - 42000, '/');
- }
-
- session_regenerate_id();
-
- db_query("UPDATE {sessions} SET sid = '%s' WHERE sid = '%s'", session_id(), $old_session_id);
- }
-
- /**
- * Counts how many users have sessions. Can count either anonymous sessions, authenticated sessions, or both.
- *
- * @param int $timestamp
- * A Unix timestamp representing a point of time in the past.
- * The default is 0, which counts all existing sessions.
- * @param int $anonymous
- * TRUE counts only anonymous users.
- * FALSE counts only authenticated users.
- * Any other value will return the count of both authenticated and anonymous users.
- * @return int
- * The number of users with sessions.
- */
- function sess_count($timestamp = 0, $anonymous = true) {
- $query = $anonymous ? ' AND uid = 0' : ' AND uid > 0';
- return db_result(db_query('SELECT COUNT(sid) AS count FROM {sessions} WHERE timestamp >= %d'. $query, $timestamp));
- }
-
- /**
- * Called by PHP session handling with the PHP session ID to end a user's session.
- *
- * @param string $sid
- * the session id
- */
- function sess_destroy_sid($sid) {
- db_query("DELETE FROM {sessions} WHERE sid = '%s'", $sid);
- }
-
- /**
- * End a specific user's session
- *
- * @param string $uid
- * the user id
- */
- function sess_destroy_uid($uid) {
- db_query('DELETE FROM {sessions} WHERE uid = %d', $uid);
- }
-
- function sess_gc($lifetime) {
- // Be sure to adjust 'php_value session.gc_maxlifetime' to a large enough
- // value. For example, if you want user sessions to stay in your database
- // for three weeks before deleting them, you need to set gc_maxlifetime
- // to '1814400'. At that value, only after a user doesn't log in after
- // three weeks (1814400 seconds) will his/her session be removed.
- db_query("DELETE FROM {sessions} WHERE timestamp < %d", time() - $lifetime);
-
- return TRUE;
- }
-
- /**
- * Determine whether to save session data of the current request.
- *
- * This function allows the caller to temporarily disable writing of session data,
- * should the request end while performing potentially dangerous operations, such as
- * manipulating the global $user object. See http://drupal.org/node/218104 for usage
- *
- * @param $status
- * Disables writing of session data when FALSE, (re-)enables writing when TRUE.
- * @return
- * FALSE if writing session data has been disabled. Otherwise, TRUE.
- */
- function session_save_session($status = NULL) {
- static $save_session = TRUE;
- if (isset($status)) {
- $save_session = $status;
- }
- return ($save_session);
- }
-