[2] | 1 | <?php |
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| 2 | /* |
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[34] | 3 | V4.93 10 Oct 2006 (c) 2000-2007 John Lim (jlim#natsoft.com.my). All rights reserved. |
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[2] | 4 | Released under both BSD license and Lesser GPL library license. |
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| 5 | Whenever there is any discrepancy between the two licenses, |
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| 6 | the BSD license will take precedence. |
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| 7 | Set tabs to 4 for best viewing. |
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| 8 | |
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| 9 | Latest version of ADODB is available at http://php.weblogs.com/adodb |
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| 10 | ====================================================================== |
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| 11 | |
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| 12 | This file provides PHP4 session management using the ADODB database |
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| 13 | wrapper library, using Oracle CLOB's to store data. Contributed by achim.gosse@ddd.de. |
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| 14 | |
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| 15 | Example |
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| 16 | ======= |
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| 17 | |
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| 18 | include('adodb.inc.php'); |
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| 19 | include('adodb-session.php'); |
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| 20 | session_start(); |
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| 21 | session_register('AVAR'); |
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[34] | 22 | $_SESSION['AVAR'] += 1; |
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| 23 | print " |
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| 24 | -- \$_SESSION['AVAR']={$_SESSION['AVAR']}</p>"; |
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[2] | 25 | |
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| 26 | To force non-persistent connections, call adodb_session_open first before session_start(): |
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| 27 | |
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| 28 | include('adodb.inc.php'); |
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| 29 | include('adodb-session.php'); |
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| 30 | adodb_session_open(false,false,false); |
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| 31 | session_start(); |
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| 32 | session_register('AVAR'); |
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[34] | 33 | $_SESSION['AVAR'] += 1; |
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| 34 | print " |
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| 35 | -- \$_SESSION['AVAR']={$_SESSION['AVAR']}</p>"; |
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[2] | 36 | |
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| 37 | |
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| 38 | Installation |
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| 39 | ============ |
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| 40 | 1. Create this table in your database (syntax might vary depending on your db): |
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| 41 | |
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| 42 | create table sessions ( |
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| 43 | SESSKEY char(32) not null, |
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| 44 | EXPIRY int(11) unsigned not null, |
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| 45 | EXPIREREF varchar(64), |
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| 46 | DATA CLOB, |
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| 47 | primary key (sesskey) |
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| 48 | ); |
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| 49 | |
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| 50 | |
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| 51 | 2. Then define the following parameters in this file: |
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| 52 | $ADODB_SESSION_DRIVER='database driver, eg. mysql or ibase'; |
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| 53 | $ADODB_SESSION_CONNECT='server to connect to'; |
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| 54 | $ADODB_SESSION_USER ='user'; |
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| 55 | $ADODB_SESSION_PWD ='password'; |
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| 56 | $ADODB_SESSION_DB ='database'; |
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| 57 | $ADODB_SESSION_TBL = 'sessions' |
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| 58 | $ADODB_SESSION_USE_LOBS = false; (or, if you wanna use CLOBS (= 'CLOB') or ( = 'BLOB') |
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| 59 | |
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[34] | 60 | 3. Recommended is PHP 4.1.0 or later. There are documented |
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[2] | 61 | session bugs in earlier versions of PHP. |
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| 62 | |
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| 63 | 4. If you want to receive notifications when a session expires, then |
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| 64 | you can tag a session with an EXPIREREF, and before the session |
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| 65 | record is deleted, we can call a function that will pass the EXPIREREF |
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| 66 | as the first parameter, and the session key as the second parameter. |
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| 67 | |
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| 68 | To do this, define a notification function, say NotifyFn: |
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| 69 | |
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| 70 | function NotifyFn($expireref, $sesskey) |
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| 71 | { |
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| 72 | } |
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| 73 | |
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| 74 | Then you need to define a global variable $ADODB_SESSION_EXPIRE_NOTIFY. |
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| 75 | This is an array with 2 elements, the first being the name of the variable |
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| 76 | you would like to store in the EXPIREREF field, and the 2nd is the |
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| 77 | notification function's name. |
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| 78 | |
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| 79 | In this example, we want to be notified when a user's session |
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| 80 | has expired, so we store the user id in the global variable $USERID, |
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| 81 | store this value in the EXPIREREF field: |
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| 82 | |
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| 83 | $ADODB_SESSION_EXPIRE_NOTIFY = array('USERID','NotifyFn'); |
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| 84 | |
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| 85 | Then when the NotifyFn is called, we are passed the $USERID as the first |
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| 86 | parameter, eg. NotifyFn($userid, $sesskey). |
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| 87 | */ |
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| 88 | |
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| 89 | if (!defined('_ADODB_LAYER')) { |
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| 90 | include (dirname(__FILE__).'/adodb.inc.php'); |
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| 91 | } |
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| 92 | |
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| 93 | if (!defined('ADODB_SESSION')) { |
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| 94 | |
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| 95 | define('ADODB_SESSION',1); |
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| 96 | |
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| 97 | /* if database time and system time is difference is greater than this, then give warning */ |
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| 98 | define('ADODB_SESSION_SYNCH_SECS',60); |
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| 99 | |
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| 100 | /****************************************************************************************\ |
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| 101 | Global definitions |
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| 102 | \****************************************************************************************/ |
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| 103 | GLOBAL $ADODB_SESSION_CONNECT, |
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| 104 | $ADODB_SESSION_DRIVER, |
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| 105 | $ADODB_SESSION_USER, |
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| 106 | $ADODB_SESSION_PWD, |
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| 107 | $ADODB_SESSION_DB, |
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| 108 | $ADODB_SESS_CONN, |
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| 109 | $ADODB_SESS_LIFE, |
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| 110 | $ADODB_SESS_DEBUG, |
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| 111 | $ADODB_SESSION_EXPIRE_NOTIFY, |
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| 112 | $ADODB_SESSION_CRC, |
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| 113 | $ADODB_SESSION_USE_LOBS, |
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| 114 | $ADODB_SESSION_TBL; |
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| 115 | |
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| 116 | if (!isset($ADODB_SESSION_USE_LOBS)) $ADODB_SESSION_USE_LOBS = 'CLOB'; |
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| 117 | |
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| 118 | $ADODB_SESS_LIFE = ini_get('session.gc_maxlifetime'); |
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| 119 | if ($ADODB_SESS_LIFE <= 1) { |
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| 120 | // bug in PHP 4.0.3 pl 1 -- how about other versions? |
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| 121 | //print "<h3>Session Error: PHP.INI setting <i>session.gc_maxlifetime</i>not set: $ADODB_SESS_LIFE</h3>"; |
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| 122 | $ADODB_SESS_LIFE=1440; |
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| 123 | } |
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| 124 | $ADODB_SESSION_CRC = false; |
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| 125 | //$ADODB_SESS_DEBUG = true; |
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| 126 | |
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| 127 | ////////////////////////////////// |
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| 128 | /* SET THE FOLLOWING PARAMETERS */ |
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| 129 | ////////////////////////////////// |
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| 130 | |
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| 131 | if (empty($ADODB_SESSION_DRIVER)) { |
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| 132 | $ADODB_SESSION_DRIVER='mysql'; |
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| 133 | $ADODB_SESSION_CONNECT='localhost'; |
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| 134 | $ADODB_SESSION_USER ='root'; |
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| 135 | $ADODB_SESSION_PWD =''; |
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| 136 | $ADODB_SESSION_DB ='xphplens_2'; |
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| 137 | } |
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| 138 | |
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| 139 | if (empty($ADODB_SESSION_EXPIRE_NOTIFY)) { |
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| 140 | $ADODB_SESSION_EXPIRE_NOTIFY = false; |
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| 141 | } |
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| 142 | // Made table name configurable - by David Johnson djohnson@inpro.net |
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| 143 | if (empty($ADODB_SESSION_TBL)){ |
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| 144 | $ADODB_SESSION_TBL = 'sessions'; |
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| 145 | } |
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| 146 | |
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| 147 | |
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| 148 | // defaulting $ADODB_SESSION_USE_LOBS |
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| 149 | if (!isset($ADODB_SESSION_USE_LOBS) || empty($ADODB_SESSION_USE_LOBS)) { |
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| 150 | $ADODB_SESSION_USE_LOBS = false; |
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| 151 | } |
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| 152 | |
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| 153 | /* |
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| 154 | $ADODB_SESS['driver'] = $ADODB_SESSION_DRIVER; |
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| 155 | $ADODB_SESS['connect'] = $ADODB_SESSION_CONNECT; |
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| 156 | $ADODB_SESS['user'] = $ADODB_SESSION_USER; |
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| 157 | $ADODB_SESS['pwd'] = $ADODB_SESSION_PWD; |
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| 158 | $ADODB_SESS['db'] = $ADODB_SESSION_DB; |
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| 159 | $ADODB_SESS['life'] = $ADODB_SESS_LIFE; |
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| 160 | $ADODB_SESS['debug'] = $ADODB_SESS_DEBUG; |
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| 161 | |
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| 162 | $ADODB_SESS['debug'] = $ADODB_SESS_DEBUG; |
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| 163 | $ADODB_SESS['table'] = $ADODB_SESS_TBL; |
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| 164 | */ |
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| 165 | |
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| 166 | /****************************************************************************************\ |
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| 167 | Create the connection to the database. |
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| 168 | |
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| 169 | If $ADODB_SESS_CONN already exists, reuse that connection |
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| 170 | \****************************************************************************************/ |
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| 171 | function adodb_sess_open($save_path, $session_name,$persist=true) |
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| 172 | { |
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| 173 | GLOBAL $ADODB_SESS_CONN; |
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| 174 | if (isset($ADODB_SESS_CONN)) return true; |
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| 175 | |
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| 176 | GLOBAL $ADODB_SESSION_CONNECT, |
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| 177 | $ADODB_SESSION_DRIVER, |
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| 178 | $ADODB_SESSION_USER, |
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| 179 | $ADODB_SESSION_PWD, |
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| 180 | $ADODB_SESSION_DB, |
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| 181 | $ADODB_SESS_DEBUG; |
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| 182 | |
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| 183 | // cannot use & below - do not know why... |
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| 184 | $ADODB_SESS_CONN = ADONewConnection($ADODB_SESSION_DRIVER); |
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| 185 | if (!empty($ADODB_SESS_DEBUG)) { |
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| 186 | $ADODB_SESS_CONN->debug = true; |
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| 187 | ADOConnection::outp( " conn=$ADODB_SESSION_CONNECT user=$ADODB_SESSION_USER pwd=$ADODB_SESSION_PWD db=$ADODB_SESSION_DB "); |
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| 188 | } |
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| 189 | if ($persist) $ok = $ADODB_SESS_CONN->PConnect($ADODB_SESSION_CONNECT, |
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| 190 | $ADODB_SESSION_USER,$ADODB_SESSION_PWD,$ADODB_SESSION_DB); |
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| 191 | else $ok = $ADODB_SESS_CONN->Connect($ADODB_SESSION_CONNECT, |
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| 192 | $ADODB_SESSION_USER,$ADODB_SESSION_PWD,$ADODB_SESSION_DB); |
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| 193 | |
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[34] | 194 | if (!$ok) ADOConnection::outp( " |
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| 195 | -- Session: connection failed</p>",false); |
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[2] | 196 | } |
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| 197 | |
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| 198 | /****************************************************************************************\ |
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| 199 | Close the connection |
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| 200 | \****************************************************************************************/ |
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| 201 | function adodb_sess_close() |
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| 202 | { |
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| 203 | global $ADODB_SESS_CONN; |
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| 204 | |
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| 205 | if ($ADODB_SESS_CONN) $ADODB_SESS_CONN->Close(); |
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| 206 | return true; |
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| 207 | } |
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| 208 | |
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| 209 | /****************************************************************************************\ |
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| 210 | Slurp in the session variables and return the serialized string |
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| 211 | \****************************************************************************************/ |
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| 212 | function adodb_sess_read($key) |
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| 213 | { |
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| 214 | global $ADODB_SESS_CONN,$ADODB_SESSION_TBL,$ADODB_SESSION_CRC; |
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| 215 | |
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| 216 | $rs = $ADODB_SESS_CONN->Execute("SELECT data FROM $ADODB_SESSION_TBL WHERE sesskey = '$key' AND expiry >= " . time()); |
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| 217 | if ($rs) { |
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| 218 | if ($rs->EOF) { |
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| 219 | $v = ''; |
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| 220 | } else |
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| 221 | $v = rawurldecode(reset($rs->fields)); |
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| 222 | |
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| 223 | $rs->Close(); |
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| 224 | |
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| 225 | // new optimization adodb 2.1 |
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| 226 | $ADODB_SESSION_CRC = strlen($v).crc32($v); |
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| 227 | |
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| 228 | return $v; |
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| 229 | } |
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| 230 | |
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| 231 | return ''; // thx to Jorma Tuomainen, webmaster#wizactive.com |
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| 232 | } |
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| 233 | |
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| 234 | /****************************************************************************************\ |
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| 235 | Write the serialized data to a database. |
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| 236 | |
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| 237 | If the data has not been modified since adodb_sess_read(), we do not write. |
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| 238 | \****************************************************************************************/ |
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| 239 | function adodb_sess_write($key, $val) |
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| 240 | { |
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| 241 | global |
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| 242 | $ADODB_SESS_CONN, |
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| 243 | $ADODB_SESS_LIFE, |
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| 244 | $ADODB_SESSION_TBL, |
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| 245 | $ADODB_SESS_DEBUG, |
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| 246 | $ADODB_SESSION_CRC, |
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| 247 | $ADODB_SESSION_EXPIRE_NOTIFY, |
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| 248 | $ADODB_SESSION_DRIVER, // added |
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| 249 | $ADODB_SESSION_USE_LOBS; // added |
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| 250 | |
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| 251 | $expiry = time() + $ADODB_SESS_LIFE; |
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| 252 | |
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| 253 | // crc32 optimization since adodb 2.1 |
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| 254 | // now we only update expiry date, thx to sebastian thom in adodb 2.32 |
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| 255 | if ($ADODB_SESSION_CRC !== false && $ADODB_SESSION_CRC == strlen($val).crc32($val)) { |
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[34] | 256 | if ($ADODB_SESS_DEBUG) echo " |
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| 257 | -- Session: Only updating date - crc32 not changed</p>"; |
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[2] | 258 | $qry = "UPDATE $ADODB_SESSION_TBL SET expiry=$expiry WHERE sesskey='$key' AND expiry >= " . time(); |
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| 259 | $rs = $ADODB_SESS_CONN->Execute($qry); |
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| 260 | return true; |
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| 261 | } |
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| 262 | $val = rawurlencode($val); |
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| 263 | |
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| 264 | $arr = array('sesskey' => $key, 'expiry' => $expiry, 'data' => $val); |
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| 265 | if ($ADODB_SESSION_EXPIRE_NOTIFY) { |
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| 266 | $var = reset($ADODB_SESSION_EXPIRE_NOTIFY); |
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| 267 | global $$var; |
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| 268 | $arr['expireref'] = $$var; |
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| 269 | } |
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| 270 | |
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| 271 | |
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| 272 | if ($ADODB_SESSION_USE_LOBS === false) { // no lobs, simply use replace() |
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| 273 | $rs = $ADODB_SESS_CONN->Replace($ADODB_SESSION_TBL,$arr, 'sesskey',$autoQuote = true); |
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| 274 | if (!$rs) { |
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| 275 | $err = $ADODB_SESS_CONN->ErrorMsg(); |
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| 276 | } |
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| 277 | } else { |
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| 278 | // what value shall we insert/update for lob row? |
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| 279 | switch ($ADODB_SESSION_DRIVER) { |
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| 280 | // empty_clob or empty_lob for oracle dbs |
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| 281 | case "oracle": |
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| 282 | case "oci8": |
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| 283 | case "oci8po": |
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| 284 | case "oci805": |
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| 285 | $lob_value = sprintf("empty_%s()", strtolower($ADODB_SESSION_USE_LOBS)); |
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| 286 | break; |
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| 287 | |
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| 288 | // null for all other |
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| 289 | default: |
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| 290 | $lob_value = "null"; |
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| 291 | break; |
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| 292 | } |
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| 293 | |
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| 294 | // do we insert or update? => as for sesskey |
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| 295 | $res = $ADODB_SESS_CONN->Execute("select count(*) as cnt from $ADODB_SESSION_TBL where sesskey = '$key'"); |
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| 296 | if ($res && reset($res->fields) > 0) { |
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| 297 | $qry = sprintf("update %s set expiry = %d, data = %s where sesskey = '%s'", $ADODB_SESSION_TBL, $expiry, $lob_value, $key); |
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| 298 | } else { |
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| 299 | // insert |
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| 300 | $qry = sprintf("insert into %s (sesskey, expiry, data) values ('%s', %d, %s)", $ADODB_SESSION_TBL, $key, $expiry, $lob_value); |
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| 301 | } |
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| 302 | |
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| 303 | $err = ""; |
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| 304 | $rs1 = $ADODB_SESS_CONN->Execute($qry); |
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| 305 | if (!$rs1) { |
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| 306 | $err .= $ADODB_SESS_CONN->ErrorMsg()."\n"; |
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| 307 | } |
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| 308 | $rs2 = $ADODB_SESS_CONN->UpdateBlob($ADODB_SESSION_TBL, 'data', $val, "sesskey='$key'", strtoupper($ADODB_SESSION_USE_LOBS)); |
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| 309 | if (!$rs2) { |
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| 310 | $err .= $ADODB_SESS_CONN->ErrorMsg()."\n"; |
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| 311 | } |
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| 312 | $rs = ($rs1 && $rs2) ? true : false; |
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| 313 | } |
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| 314 | |
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| 315 | if (!$rs) { |
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[34] | 316 | ADOConnection::outp( ' |
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| 317 | -- Session Replace: '.nl2br($err).'</p>',false); |
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[2] | 318 | } else { |
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| 319 | // bug in access driver (could be odbc?) means that info is not commited |
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| 320 | // properly unless select statement executed in Win2000 |
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| 321 | if ($ADODB_SESS_CONN->databaseType == 'access') |
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| 322 | $rs = $ADODB_SESS_CONN->Execute("select sesskey from $ADODB_SESSION_TBL WHERE sesskey='$key'"); |
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| 323 | } |
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| 324 | return !empty($rs); |
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| 325 | } |
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| 326 | |
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| 327 | function adodb_sess_destroy($key) |
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| 328 | { |
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| 329 | global $ADODB_SESS_CONN, $ADODB_SESSION_TBL,$ADODB_SESSION_EXPIRE_NOTIFY; |
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| 330 | |
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| 331 | if ($ADODB_SESSION_EXPIRE_NOTIFY) { |
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| 332 | reset($ADODB_SESSION_EXPIRE_NOTIFY); |
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| 333 | $fn = next($ADODB_SESSION_EXPIRE_NOTIFY); |
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| 334 | $savem = $ADODB_SESS_CONN->SetFetchMode(ADODB_FETCH_NUM); |
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| 335 | $rs = $ADODB_SESS_CONN->Execute("SELECT expireref,sesskey FROM $ADODB_SESSION_TBL WHERE sesskey='$key'"); |
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| 336 | $ADODB_SESS_CONN->SetFetchMode($savem); |
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| 337 | if ($rs) { |
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| 338 | $ADODB_SESS_CONN->BeginTrans(); |
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| 339 | while (!$rs->EOF) { |
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| 340 | $ref = $rs->fields[0]; |
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| 341 | $key = $rs->fields[1]; |
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| 342 | $fn($ref,$key); |
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| 343 | $del = $ADODB_SESS_CONN->Execute("DELETE FROM $ADODB_SESSION_TBL WHERE sesskey='$key'"); |
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| 344 | $rs->MoveNext(); |
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| 345 | } |
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| 346 | $ADODB_SESS_CONN->CommitTrans(); |
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| 347 | } |
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| 348 | } else { |
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| 349 | $qry = "DELETE FROM $ADODB_SESSION_TBL WHERE sesskey = '$key'"; |
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| 350 | $rs = $ADODB_SESS_CONN->Execute($qry); |
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| 351 | } |
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| 352 | return $rs ? true : false; |
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| 353 | } |
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| 354 | |
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| 355 | function adodb_sess_gc($maxlifetime) |
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| 356 | { |
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| 357 | global $ADODB_SESS_DEBUG, $ADODB_SESS_CONN, $ADODB_SESSION_TBL,$ADODB_SESSION_EXPIRE_NOTIFY; |
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| 358 | |
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| 359 | if ($ADODB_SESSION_EXPIRE_NOTIFY) { |
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| 360 | reset($ADODB_SESSION_EXPIRE_NOTIFY); |
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| 361 | $fn = next($ADODB_SESSION_EXPIRE_NOTIFY); |
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| 362 | $savem = $ADODB_SESS_CONN->SetFetchMode(ADODB_FETCH_NUM); |
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| 363 | $t = time(); |
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| 364 | $rs = $ADODB_SESS_CONN->Execute("SELECT expireref,sesskey FROM $ADODB_SESSION_TBL WHERE expiry < $t"); |
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| 365 | $ADODB_SESS_CONN->SetFetchMode($savem); |
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| 366 | if ($rs) { |
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| 367 | $ADODB_SESS_CONN->BeginTrans(); |
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| 368 | while (!$rs->EOF) { |
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| 369 | $ref = $rs->fields[0]; |
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| 370 | $key = $rs->fields[1]; |
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| 371 | $fn($ref,$key); |
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| 372 | $del = $ADODB_SESS_CONN->Execute("DELETE FROM $ADODB_SESSION_TBL WHERE sesskey='$key'"); |
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| 373 | $rs->MoveNext(); |
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| 374 | } |
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| 375 | $rs->Close(); |
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| 376 | |
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| 377 | //$ADODB_SESS_CONN->Execute("DELETE FROM $ADODB_SESSION_TBL WHERE expiry < $t"); |
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| 378 | $ADODB_SESS_CONN->CommitTrans(); |
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| 379 | |
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| 380 | } |
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| 381 | } else { |
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| 382 | $ADODB_SESS_CONN->Execute("DELETE FROM $ADODB_SESSION_TBL WHERE expiry < " . time()); |
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| 383 | |
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[34] | 384 | if ($ADODB_SESS_DEBUG) ADOConnection::outp(" |
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| 385 | -- <b>Garbage Collection</b>: $qry</p>"); |
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[2] | 386 | } |
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| 387 | // suggested by Cameron, "GaM3R" <gamr@outworld.cx> |
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| 388 | if (defined('ADODB_SESSION_OPTIMIZE')) { |
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| 389 | global $ADODB_SESSION_DRIVER; |
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| 390 | |
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| 391 | switch( $ADODB_SESSION_DRIVER ) { |
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| 392 | case 'mysql': |
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| 393 | case 'mysqlt': |
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| 394 | $opt_qry = 'OPTIMIZE TABLE '.$ADODB_SESSION_TBL; |
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| 395 | break; |
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| 396 | case 'postgresql': |
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| 397 | case 'postgresql7': |
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| 398 | $opt_qry = 'VACUUM '.$ADODB_SESSION_TBL; |
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| 399 | break; |
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| 400 | } |
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| 401 | if (!empty($opt_qry)) { |
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| 402 | $ADODB_SESS_CONN->Execute($opt_qry); |
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| 403 | } |
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| 404 | } |
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| 405 | if ($ADODB_SESS_CONN->dataProvider === 'oci8') $sql = 'select TO_CHAR('.($ADODB_SESS_CONN->sysTimeStamp).', \'RRRR-MM-DD HH24:MI:SS\') from '. $ADODB_SESSION_TBL; |
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| 406 | else $sql = 'select '.$ADODB_SESS_CONN->sysTimeStamp.' from '. $ADODB_SESSION_TBL; |
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| 407 | |
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| 408 | $rs =& $ADODB_SESS_CONN->SelectLimit($sql,1); |
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| 409 | if ($rs && !$rs->EOF) { |
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| 410 | |
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| 411 | $dbts = reset($rs->fields); |
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| 412 | $rs->Close(); |
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| 413 | $dbt = $ADODB_SESS_CONN->UnixTimeStamp($dbts); |
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| 414 | $t = time(); |
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| 415 | if (abs($dbt - $t) >= ADODB_SESSION_SYNCH_SECS) { |
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| 416 | $msg = |
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[34] | 417 | __FILE__.": Server time for webserver {$_SERVER['HTTP_HOST']} not in synch with database: database=$dbt ($dbts), webserver=$t (diff=".(abs($dbt-$t)/3600)." hrs)"; |
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[2] | 418 | error_log($msg); |
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[34] | 419 | if ($ADODB_SESS_DEBUG) ADOConnection::outp(" |
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| 420 | -- $msg</p>"); |
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[2] | 421 | } |
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| 422 | } |
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| 423 | |
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| 424 | return true; |
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| 425 | } |
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| 426 | |
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| 427 | session_module_name('user'); |
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| 428 | session_set_save_handler( |
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| 429 | "adodb_sess_open", |
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| 430 | "adodb_sess_close", |
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| 431 | "adodb_sess_read", |
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| 432 | "adodb_sess_write", |
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| 433 | "adodb_sess_destroy", |
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| 434 | "adodb_sess_gc"); |
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| 435 | } |
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| 436 | |
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| 437 | /* TEST SCRIPT -- UNCOMMENT */ |
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| 438 | |
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| 439 | if (0) { |
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| 440 | |
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| 441 | session_start(); |
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| 442 | session_register('AVAR'); |
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[34] | 443 | $_SESSION['AVAR'] += 1; |
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| 444 | ADOConnection::outp( " |
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| 445 | -- \$_SESSION['AVAR']={$_SESSION['AVAR']}</p>",false); |
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[2] | 446 | } |
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| 447 | |
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| 448 | ?> |
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