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annotate includes/session.inc @ 5:2427550111ae 6.2

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Drupal 6.2
author Franck Deroche <webmaster@defr.org>
date Tue, 23 Dec 2008 14:30:08 +0100
parents c1f4ac30525a
children acef7ccb09b5
rev   line source
webmaster@1 1 <?php
webmaster@1 2 // $Id: session.inc,v 1.44.2.1 2008/02/07 11:58:40 goba Exp $
webmaster@1 3
webmaster@1 4 /**
webmaster@1 5 * @file
webmaster@1 6 * User session handling functions.
webmaster@1 7 */
webmaster@1 8
webmaster@1 9 function sess_open($save_path, $session_name) {
webmaster@1 10 return TRUE;
webmaster@1 11 }
webmaster@1 12
webmaster@1 13 function sess_close() {
webmaster@1 14 return TRUE;
webmaster@1 15 }
webmaster@1 16
webmaster@1 17 function sess_read($key) {
webmaster@1 18 global $user;
webmaster@1 19
webmaster@1 20 // Write and Close handlers are called after destructing objects since PHP 5.0.5
webmaster@1 21 // Thus destructors can use sessions but session handler can't use objects.
webmaster@1 22 // So we are moving session closure before destructing objects.
webmaster@1 23 register_shutdown_function('session_write_close');
webmaster@1 24
webmaster@1 25 // Handle the case of first time visitors and clients that don't store cookies (eg. web crawlers).
webmaster@1 26 if (!isset($_COOKIE[session_name()])) {
webmaster@1 27 $user = drupal_anonymous_user();
webmaster@1 28 return '';
webmaster@1 29 }
webmaster@1 30
webmaster@1 31 // Otherwise, if the session is still active, we have a record of the client's session in the database.
webmaster@1 32 $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'", $key));
webmaster@1 33
webmaster@1 34 // We found the client's session record and they are an authenticated user
webmaster@1 35 if ($user && $user->uid > 0) {
webmaster@1 36 // This is done to unserialize the data member of $user
webmaster@1 37 $user = drupal_unpack($user);
webmaster@1 38
webmaster@1 39 // Add roles element to $user
webmaster@1 40 $user->roles = array();
webmaster@1 41 $user->roles[DRUPAL_AUTHENTICATED_RID] = 'authenticated user';
webmaster@1 42 $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", $user->uid);
webmaster@1 43 while ($role = db_fetch_object($result)) {
webmaster@1 44 $user->roles[$role->rid] = $role->name;
webmaster@1 45 }
webmaster@1 46 }
webmaster@1 47 // We didn't find the client's record (session has expired), or they are an anonymous user.
webmaster@1 48 else {
webmaster@1 49 $session = isset($user->session) ? $user->session : '';
webmaster@1 50 $user = drupal_anonymous_user($session);
webmaster@1 51 }
webmaster@1 52
webmaster@1 53 return $user->session;
webmaster@1 54 }
webmaster@1 55
webmaster@1 56 function sess_write($key, $value) {
webmaster@1 57 global $user;
webmaster@1 58
webmaster@1 59 // If saving of session data is disabled or if the client doesn't have a session,
webmaster@1 60 // and one isn't being created ($value), do nothing.
webmaster@1 61 if (!session_save_session() || (empty($_COOKIE[session_name()]) && empty($value))) {
webmaster@1 62 return TRUE;
webmaster@1 63 }
webmaster@1 64
webmaster@1 65 $result = db_result(db_query("SELECT COUNT(*) FROM {sessions} WHERE sid = '%s'", $key));
webmaster@1 66
webmaster@1 67 if (!$result) {
webmaster@1 68 // Only save session data when when the browser sends a cookie. This keeps
webmaster@1 69 // crawlers out of session table. This reduces memory and server load,
webmaster@1 70 // and gives more useful statistics. We can't eliminate anonymous session
webmaster@1 71 // table rows without breaking throttle module and "Who's Online" block.
webmaster@1 72 if ($user->uid || $value || count($_COOKIE)) {
webmaster@1 73 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());
webmaster@1 74 }
webmaster@1 75 }
webmaster@1 76 else {
webmaster@1 77 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(), $key);
webmaster@1 78
webmaster@1 79 // Last access time is updated no more frequently than once every 180 seconds.
webmaster@1 80 // This reduces contention in the users table.
webmaster@1 81 if ($user->uid && time() - $user->access > variable_get('session_write_interval', 180)) {
webmaster@1 82 db_query("UPDATE {users} SET access = %d WHERE uid = %d", time(), $user->uid);
webmaster@1 83 }
webmaster@1 84 }
webmaster@1 85
webmaster@1 86 return TRUE;
webmaster@1 87 }
webmaster@1 88
webmaster@1 89 /**
webmaster@1 90 * Called when an anonymous user becomes authenticated or vice-versa.
webmaster@1 91 */
webmaster@1 92 function sess_regenerate() {
webmaster@1 93 $old_session_id = session_id();
webmaster@1 94
webmaster@1 95 // We code around http://bugs.php.net/bug.php?id=32802 by destroying
webmaster@1 96 // the session cookie by setting expiration in the past (a negative
webmaster@1 97 // value). This issue only arises in PHP versions before 4.4.0,
webmaster@1 98 // regardless of the Drupal configuration.
webmaster@1 99 // TODO: remove this when we require at least PHP 4.4.0
webmaster@1 100 if (isset($_COOKIE[session_name()])) {
webmaster@1 101 setcookie(session_name(), '', time() - 42000, '/');
webmaster@1 102 }
webmaster@1 103
webmaster@1 104 session_regenerate_id();
webmaster@1 105
webmaster@1 106 db_query("UPDATE {sessions} SET sid = '%s' WHERE sid = '%s'", session_id(), $old_session_id);
webmaster@1 107 }
webmaster@1 108
webmaster@1 109 /**
webmaster@1 110 * Counts how many users have sessions. Can count either anonymous sessions, authenticated sessions, or both.
webmaster@1 111 *
webmaster@1 112 * @param int $timestamp
webmaster@1 113 * A Unix timestamp representing a point of time in the past.
webmaster@1 114 * The default is 0, which counts all existing sessions.
webmaster@1 115 * @param int $anonymous
webmaster@1 116 * TRUE counts only anonymous users.
webmaster@1 117 * FALSE counts only authenticated users.
webmaster@1 118 * Any other value will return the count of both authenticated and anonymous users.
webmaster@1 119 * @return int
webmaster@1 120 * The number of users with sessions.
webmaster@1 121 */
webmaster@1 122 function sess_count($timestamp = 0, $anonymous = true) {
webmaster@1 123 $query = $anonymous ? ' AND uid = 0' : ' AND uid > 0';
webmaster@1 124 return db_result(db_query('SELECT COUNT(sid) AS count FROM {sessions} WHERE timestamp >= %d'. $query, $timestamp));
webmaster@1 125 }
webmaster@1 126
webmaster@1 127 /**
webmaster@1 128 * Called by PHP session handling with the PHP session ID to end a user's session.
webmaster@1 129 *
webmaster@1 130 * @param string $sid
webmaster@1 131 * the session id
webmaster@1 132 */
webmaster@1 133 function sess_destroy_sid($sid) {
webmaster@1 134 db_query("DELETE FROM {sessions} WHERE sid = '%s'", $sid);
webmaster@1 135 }
webmaster@1 136
webmaster@1 137 /**
webmaster@1 138 * End a specific user's session
webmaster@1 139 *
webmaster@1 140 * @param string $uid
webmaster@1 141 * the user id
webmaster@1 142 */
webmaster@1 143 function sess_destroy_uid($uid) {
webmaster@1 144 db_query('DELETE FROM {sessions} WHERE uid = %d', $uid);
webmaster@1 145 }
webmaster@1 146
webmaster@1 147 function sess_gc($lifetime) {
webmaster@1 148 // Be sure to adjust 'php_value session.gc_maxlifetime' to a large enough
webmaster@1 149 // value. For example, if you want user sessions to stay in your database
webmaster@1 150 // for three weeks before deleting them, you need to set gc_maxlifetime
webmaster@1 151 // to '1814400'. At that value, only after a user doesn't log in after
webmaster@1 152 // three weeks (1814400 seconds) will his/her session be removed.
webmaster@1 153 db_query("DELETE FROM {sessions} WHERE timestamp < %d", time() - $lifetime);
webmaster@1 154
webmaster@1 155 return TRUE;
webmaster@1 156 }
webmaster@1 157
webmaster@1 158 /**
webmaster@1 159 * Determine whether to save session data of the current request.
webmaster@1 160 *
webmaster@1 161 * This function allows the caller to temporarily disable writing of session data,
webmaster@1 162 * should the request end while performing potentially dangerous operations, such as
webmaster@1 163 * manipulating the global $user object. See http://drupal.org/node/218104 for usage
webmaster@1 164 *
webmaster@1 165 * @param $status
webmaster@1 166 * Disables writing of session data when FALSE, (re-)enables writing when TRUE.
webmaster@1 167 * @return
webmaster@1 168 * FALSE if writing session data has been disabled. Otherwise, TRUE.
webmaster@1 169 */
webmaster@1 170 function session_save_session($status = NULL) {
webmaster@1 171 static $save_session = TRUE;
webmaster@1 172 if (isset($status)) {
webmaster@1 173 $save_session = $status;
webmaster@1 174 }
webmaster@1 175 return ($save_session);
webmaster@1 176 }