<?php
/*
* Sessionara - Session based data environment with MySQL
* Copyright (c) 2001-2004 Dario Nuevo
* http://php.xbe.ch | dn(*at*)xbe(*dot*)ch
* Release 1.7-r1 [build 20041103]
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ADDITION: Please send me improvement ideas and realized stuff. At least tell
* me about it *g*. I's great to have some input.
*
* You'll find the entire GNU GPL in the LICENSE file.
* --------------------------------------------------
* Quick guide
* For questions regarding the install process, take a look at the documentation (you'll find it on the website).
* Here's a little example how you could use it:
*
* $ses = new Sessionara("W/MYSQL");
* $ses->var_set("foo","bar");
* echo "Session has ID ".($ses->get_sid());
*
* (on another page, pass the $sid through GET or POST):
*
* $ses = new Sessionara(); // <- calling withough param = resuming session
* echo $ses->var_get("foo");
*/
class Sessionara
{
var $cfg;
var $sid;
function Sessionara($sqlquery = "") {
// **** configuration **** [default]
$this->cfg = array();
// Generated $sid's string length [26]
$this->cfg["sid_howlong"] = 26;
// Session lifetime in minutes [10]
$this->cfg["session_howlong"] = 10;
// Class' table name
$this->cfg["db_table"] = "foo_sessions";
// What should the class do in a case of an expired session?
$this->cfg["timeout_action"] = "error"; // options "redir", "error"
// In the case of an expired session, we'll send the user to this location
$this->cfg["timeoutpage"] = "index.php";
// Keyword to pass if you don't pass a sql select statement (V1.1)
$this->cfg["placeholder"] = "W/MYSQL";
// transport the sid automatically with a cookie? ("enable cookies?") (V1.7)
$this->cfg["use_cookies"] = true;
// BETA FEATURE: Decide to (not) use first "security" tries (V1.1) [false]
$this->cfg["use_addr"] = true; // true, false or "old" (last as string!)
/*
mysql table field names
here you can alter the mysql field names that are used. if you just use the normal sql to create the table, don't care about this... *g
but if you want to integrate this class into a project-based database scheme, it's useful that you can define the field names that are used..
i hope i don't have to mention that you just have to change the _value_ of this array! i.e. $this->cfg["tfields"]["autoid"] = "ID";
*/
$this->cfg["tfields"]["autoid"] = "autoid"; // primary key
$this->cfg["tfields"]["sid"] = "sid"; // session id
$this->cfg["tfields"]["data"] = "data"; // data container
$this->cfg["tfields"]["addr"] = "addr"; // remote address or strid
$this->cfg["tfields"]["opened"] = "opened"; // timestamp open
$this->cfg["tfields"]["expire"] = "expire"; // timestamp expire time
$this->session_table_cleanup();
$this->logged_in = false;
$this->sid = $this->lookup_sid();
if((strlen($this->sid) == $this->cfg["sid_howlong"]) && (strlen($sqlquery)<1)) $this->resume_session();
elseif(strlen($sqlquery) > 1) $this->open_session($sqlquery);
else $this->timeout();
if($sqlquery == $this->cfg["placeholder"]) $this->login();
$this->res = array();
}
function lookup_sid() {
// bad coding, but variable variables doesnt't work on superglobals like $_POST..
if(strlen($_GET["sid"]) == $this->cfg["sid_howlong"]) {
return $_GET["sid"];
}else{
if(strlen($_POST["sid"]) == $this->cfg["sid_howlong"]) {
return $_POST["sid"];
}else{
if(strlen($_COOKIE["sid"]) == $this->cfg["sid_howlong"]) {
return $_COOKIE["sid"];
}else{
return false;
}
}
}
}
/* *******************************************************************************************
session creating, etc..
*/
function open_session($sqlquery) {
$this->sqlquery = $sqlquery;
$this->sid = $this->get_hashy();
return true;
}
function resume_session() {
$query = $this->complete_sql("SELECT `".$this->fname("autoid")."` FROM `{$this->cfg["db_table"]}` WHERE `".$this->fname("sid")."`='{$this->sid}'");
$rs = mysql_query($query);
if(mysql_num_rows($rs) != 0) {
$this->logged_in = true;
$this->var_load();
$this->give_lifetime();
return true;
$rs = null;
} else {
$this->timeout();
}
}
function login() {
/*
* If you pass a SQL statement to open a session, you have to call this function to check
* the query. Make a if($ses->login()) over it.
* Returns true if the query returns more than 0 row, otherwise false.
*/
if($this->logged_in == false) {
$this->data = array();
if($this->sqlquery != $this->cfg["placeholder"]) {
if(strtolower(substr($this->sqlquery,0,6)) != "select") $this->perror("Invalid call to login(). Pass SELECT statements only.");
$rs = mysql_query($this->sqlquery);
if(mysql_num_rows($rs) == 0) {
$makeit = false;
} else {
$makeit = true;
$resi = mysql_fetch_array($rs);
$rs = null;
}
} else {
$makeit = true;
}
if($makeit == true) {
if(($this->session_create($this->sid))==true) {
$this->logged_in = true;
$this->var_set($resi);
//$this->var_save();
if($this->cfg["use_cookies"]) $this->send_cookie();
return true;
} else {
return false;
}
} else {
return false;
}
} else {
return true;
}
}
function session_create($sid) {
$this->datavarset( array(
"SESSION_START" => (time()),
"SESSION_EXPIRE" => ((time())+(60*$this->cfg["session_howlong"])),
"SESSION_STRID" => ($this->get_strid()),
"SESSION_QUERIES" => array(),
"SID" => $sid
));
$rs = mysql_query("INSERT INTO `{$this->cfg["db_table"]}` (`".$this->fname("sid")."`, `".$this->fname("opened")."`, `".$this->fname("expire")."`, `".$this->fname("addr")."`) VALUES ('{$sid}', '{$this->data["SESSION_START"]}', '{$this->data["SESSION_EXPIRE"]}', '".($this->get_strid())."');");
if(mysql_affected_rows()==0) $this->perror("DB error, could not insert new session row");
else return true;
}
function session_close() {
mysql_query(($this->complete_sql("UPDATE `{$this->cfg["db_table"]}` SET `".$this->fname("expire")."`=100 WHERE `".$this->fname("sid")."`='{$this->sid}'")));
return $this->session_table_cleanup();
}
// lazy people like me make function for everything.. returns defined table name
function fname($name) {
if(isset($this->cfg["tfields"][$name])) return $this->cfg["tfields"][$name];
else $this->perror("Invalid internal call! Didn't find a table field name...");
}
/* *******************************************************************************************
session timing stuff
*/
function session_table_cleanup() {
/*
* Deletes all outdated sessions from the table
*/
mysql_query("DELETE FROM `{$this->cfg["db_table"]}` WHERE (`".$this->fname("expire")."` < ".(time()).");");
return true;
}
function give_lifetime() {
$this->data["SESSION_EXPIRE"] = (time()+(60*$this->cfg["session_howlong"]));
mysql_query(($this->complete_sql("UPDATE `{$this->cfg["db_table"]}` SET `".$this->fname("expire")."`={$this->data["SESSION_EXPIRE"]} WHERE `".$this->fname("sid")."`='{$this->sid}'")));
$this->set_cookie( $timy );
if(mysql_affected_rows() > 0) {
if($this->cfg["use_cookies"]) $this->set_cookie( $this->data["SESSION_EXPIRE"] );
return $this->data["SESSION_EXPIRE"];
}else{
return false;
}
}
function timeout() {
if($this->cfg["timeout_action"] == "redir") header("Location: {$this->cfg["timeoutpage"]}");
else $this->perror("Session could not be established.");
}
/* *******************************************************************************************
session variable stuff
*/
// returns a session variable/query
function var_get($name, $number = false) {
if( $this->logged_in() ) {
if( $this->is_sessionquery( $name ) ) {
if($number) return $this->data[$name][$number];
else return $this->next($name);
} else {
if(strlen($this->data[$name]) != 0) return $this->data[$name];
else return "";
}
}
}
// sets a variable value
function var_set($name, $value = "", $save = true) {
if($this->logged_in()) {
if(is_array($name)) {
foreach($name as $key=>$val) {
if(strlen($key)>0 && strlen($val)>0) $this->var_set($key,$val,false);
}
$this->var_save();
}else{
$this->data[$name] = $value;
if($save) $this->var_save();
}
}else{
return false;
}
}
// unsets ("deletes") a variable
function var_unset($name) {
if($this->logged_in()) {
if($this->is_sessionquery($name)) $this->data["SESSION_QUERIES"][$name] = null;
if(isset($this->data[$name])) unset($this->data[$name]);
return $this->var_save();
}
}
// private; saves data to db table
function var_save() {
$this->data["cfg"] = $this->cfg;
$tosave = addslashes(serialize($this->data));
$query = $this->complete_sql("UPDATE `{$this->cfg["db_table"]}` SET ".$this->fname("data")."='{$tosave}' WHERE `".$this->fname("sid")."`='{$this->sid}'");
$rs = mysql_query($query);
if(mysql_affected_rows()!=0) return true;
else return false;
}
// private; loads data from db table
function var_load() {
$query = $this->complete_sql("SELECT * FROM `{$this->cfg["db_table"]}` WHERE `".$this->fname("sid")."`='{$this->sid}'");
$rs = mysql_query($query);
if(mysql_num_rows($rs)!=0) {
$resi = mysql_fetch_array($rs);
$data = stripslashes($resi["data"]);
$data = unserialize($data);
$this->data = $data;
$this->cfg = $this->data["cfg"];
return true;
} else {
return false;
}
}
// abandoned as of release 1.7
function rs2session(&$obj_recordset) {
return false;
}
// private; internal way to set a variable group. this and the one below should be cleaned out..
function datavarset($name, $val = "") {
if(is_array($name)) {
foreach($name as $key=>$rval) {
$this->datavarset_single($key, $rval);
}
}else{
$this->datavarset_single($name, $val);
}
}
// private; single variable setting..
function datavarset_single($name, $val) {
$this->data[$name] = $val;
}
/* *******************************************************************************************
session queries
*/
// sets/opens a session query - see the doc
function sql2session($name, $select_statement) {
$data = array();
$rs = mysql_query($select_statement);
if(mysql_num_rows($rs) != 0) {
while($resi = mysql_fetch_array($rs)) {
$data[] = $resi;
}
}
$this->data[$name] = $data;
$this->definequery($name);
$this->var_save();
$rs = null;
return true;
}
// returns next row of a session query
function next($name) {
if($this->is_sessionquery($name)) {
$return = $this->data[$name][$this->data["SESSION_QUERIES"][$name]];
if($this->data["SESSION_QUERIES"][$name] < count($this->data[$name])+1) {
$this->data["SESSION_QUERIES"][$name]++;
$this->var_save();
}else{
$return = false;
}
return $return;
}else{
return false;
}
}
// returns the number of element that a session query holds
function count($name) {
if($this->is_sessionquery($name)) return count($this->data[$name]);
else return false;
}
// returns an entire content of a session query
function sq_get($name) {
if($this->is_sessionquery($name)) return $this->data[$name];
else return false;
}
// resets a session query
function reset($name) {
return $this->definequery($name);
}
// private; "registers" a variable as a session query [V1.5]
function definequery($name) {
$this->data["SESSION_QUERIES"][$name] = (int)0;
return true;
}
// private; check function
function is_sessionquery($name) {
if(array_key_exists($name,$this->data["SESSION_QUERIES"])) return true;
else return false;
}
/* *******************************************************************************************
cookies
*/
// private; sends a cookie
function send_cookie() {
setcookie ( "sid", $this->sid, time() + ( 60 * $this->cfg["session_howlong"] ), "/" );
}
// private; sends cookie with variable time
function set_cookie( $expire ) {
setcookie ( "sid", $this->sid, $expire, "/" );
}
// private; deletes the sid cookie
function del_cookies( $all = false ) {
setcookie ( "sid", "", time()-3000, "/" );
}
/* *******************************************************************************************
strings
*/
// returns html link with session id; customizable
function get_link($document, $text = "", $target = "", $qstring = "", $getsid = true) {
if($getsid == true) {
$sid = "?sid=".$this->data["SID"];
$sid .= "&";
} else {
$sid = "?";
}
if(strlen($target) != 0) {
$target = " target=\"{$target}\"";
}
return "<a href=\"{$document}{$sid}{$qstring}\"{$target}>{$text}</a>";
}
// returns the current session id
function get_sid() {
return $this->sid;
}
// gets string for inclusion in query string
function get_querystring() {
return "sid=".$this->sid;
}
// gets html for input hidden field with the sid (or other values) for inclusion in web forms
function get_hiddenfield($name = "", $value = "") {
if(strlen($name) == 0) {
$name = "sid";
$value = $this->sid;
}
return "<input type=\"hidden\" name=\"{$name}\" value=\"{$value}\">";
}
// returns a random string
function get_hashy() {
srand ((float) microtime() * 10000000);
return substr(md5(rand(0,9999999)),0,$this->cfg["sid_howlong"]);
}
// returns the "strid" string, see the doc V1.5
function get_strid() {
if($this->cfg["use_addr"] == true) {
$vals = array("REMOTE_ADDR","HTTP_USER_AGENT","HTTP_VIA");
foreach($vals as $val) $strid .= $_SERVER[$val];
return md5($strid);
}elseif($this->cfg["use_addr"] == "old") {
return $_SERVER["REMOTE_ADDR"];
}else{
return "";
}
}
/* *******************************************************************************************
misc
*/
// changes conf option during session
function set_option($setting, $value) {
if(array_key_exists($setting,$this->cfg) == TRUE && $setting != "sid_howlong") {
$this->cfg[$setting] = $value;
$this->var_save();
return true;
} else {
return false;
}
}
// kept for compatibility (<-- difficult word)
function set_timeoutpage($value) {
return $this->set_option("timeoutpage",$value);
}
// private; completes queries
function complete_sql($value) {
return $this->return_sql("{$value} AND `".$this->fname("addr")."`='".($this->get_strid())."'");
}
// private; returns sql
function return_sql($value) {
if(strtolower(substr($value,0,6)) == "update") return "{$value};";
else return "{$value} LIMIT 0,1;";
}
// prints out arrays in a nice way in browsers..
function p_array($arr, $pre = true) {
if(is_array($arr)) {
if($pre == true) $ins = array("<pre>","</pre><br>\n","");
else $ins = array("","","\t");
$backy = "{$ins[0]}Array (\n";
foreach($arr as $key=>$value) {
$value = $this->p_array_returnval($value);
$backy .= "{$ins[2]}[{$key}] => {$value}\n";
}
$backy .= ");{$ins[1]}";
return $backy;
} else {
return false;
}
}
// subfunction for recursion..
function p_array_returnval($value) {
if(is_array($value)) return $this->p_array($value,false);
else return $value;
}
// prints config
function p_cfg() {
echo $this->p_array($this->cfg);
}
/* *******************************************************************************************
error stuff
*/
// prints out error & dies ;(
function perror($errormsg) {
echo "<b>Error orcurred:</b> {$errormsg}\n";
die;
}
// tells if user is "logged in" - if session exists
function logged_in() {
if($this->sqlquery != $this->cfg["placeholder"] AND $this->logged_in == false) $this->perror("Session is not created. Call login() before trying to execute other session functions.");
else return true;
}
}
?>
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