130 lines
4.6 KiB
PHP
130 lines
4.6 KiB
PHP
<?php
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// $Id$
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/**
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* @file
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* User session handling functions.
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*/
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function sess_open($save_path, $session_name) {
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return TRUE;
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}
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function sess_close() {
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return TRUE;
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}
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function sess_read($key) {
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global $user;
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// Handle the case of first time visitors and clients that don't store cookies (eg. web crawlers).
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if (!isset($_COOKIE[session_name()])) {
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$user = drupal_anonymous_user();
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return '';
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}
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// Otherwise, if the session is still active, we have a record of the client's session in the database.
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$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'", $key));
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// We found the client's session record and they are an authenticated user
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if ($user && $user->uid > 0) {
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// This is done to unserialize the data member of $user
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$user = drupal_unpack($user);
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// Add roles element to $user
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$user->roles = array();
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$user->roles[DRUPAL_AUTHENTICATED_RID] = 'authenticated user';
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$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", $user->uid);
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while ($role = db_fetch_object($result)) {
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$user->roles[$role->rid] = $role->name;
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}
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}
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// We didn't find the client's record (session has expired), or they are an anonymous user.
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else {
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$user = drupal_anonymous_user($user->session);
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}
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return $user->session;
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}
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function sess_write($key, $value) {
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global $user;
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// If the client doesn't have a session, and one isn't being created ($value), do nothing.
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if (empty($_COOKIE[session_name()]) && empty($value)) {
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return TRUE;
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}
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$result = db_query("SELECT sid FROM {sessions} WHERE sid = '%s'", $key);
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if (!db_num_rows($result)) {
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// Only save session data when when the browser sends a cookie. This keeps
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// crawlers out of session table. This improves speed up queries, reduces
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// memory, and gives more useful statistics. We can't eliminate anonymous
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// session table rows without breaking throttle module and "Who's Online"
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// block.
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if ($user->uid || $value || count($_COOKIE)) {
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db_query("INSERT INTO {sessions} (sid, uid, cache, hostname, session, timestamp) VALUES ('%s', %d, %d, '%s', '%s', %d)", $key, $user->uid, $user->cache, $_SERVER["REMOTE_ADDR"], $value, time());
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}
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}
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else {
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db_query("UPDATE {sessions} SET uid = %d, cache = %d, hostname = '%s', session = '%s', timestamp = %d WHERE sid = '%s'", $user->uid, $user->cache, $_SERVER["REMOTE_ADDR"], $value, time(), $key);
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// TODO: this can be an expensive query. Perhaps only execute it every x minutes. Requires investigation into cache expiration.
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if ($user->uid) {
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db_query("UPDATE {users} SET access = %d WHERE uid = %d", time(), $user->uid);
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}
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}
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return TRUE;
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}
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/**
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* Called when an anonymous user becomes authenticated or vice-versa.
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*/
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function sess_regenerate() {
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$old_session_id = session_id();
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session_regenerate_id();
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db_query("UPDATE {sessions} SET sid = '%s' WHERE sid = '%s'", session_id(), $old_session_id);
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}
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/**
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* Counts how many users have sessions. Can count either anonymous sessions, authenticated sessions, or both.
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*
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* @param int $timestamp
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* A Unix timestamp representing a point of time in the past.
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* The default is 0, which counts all existing sessions.
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* @param int $anonymous
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* TRUE counts only anonymous users.
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* FALSE counts only authenticated users.
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* Any other value will return the count of both authenticated and anonymous users.
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* @return int
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* The number of users with sessions.
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*/
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function sess_count($timestamp = 0, $anonymous = true) {
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$query = $anonymous ? ' AND uid = 0' : ' AND uid > 0';
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return db_result(db_query('SELECT COUNT(sid) AS count FROM {sessions} WHERE timestamp >= %d'. $query, $timestamp));
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}
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/**
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* Called by PHP session handling with the PHP session ID to end a user's session.
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* Can also be called directly, either with the PHP session ID or another identifier
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* such as uid to end a specific user's session.
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*
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* @param string $uid
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* the user id
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*/
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function sess_destroy($uid) {
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db_query('DELETE FROM {sessions} WHERE uid = %d', $uid);
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}
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function sess_gc($lifetime) {
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// Be sure to adjust 'php_value session.gc_maxlifetime' to a large enough
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// value. For example, if you want user sessions to stay in your database
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// for three weeks before deleting them, you need to set gc_maxlifetime
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// to '1814400'. At that value, only after a user doesn't log in after
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// three weeks (1814400 seconds) will his/her session be removed.
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db_query("DELETE FROM {sessions} WHERE timestamp < %d", time() - $lifetime);
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return TRUE;
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} |