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sessinit.inc.shtml.wml
91a0628ec215maint-1.2

sessinit.inc.shtml.wml
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			## $Id$
			## Purpose: initializes CDS session management
			##
			## Note: based on the "PHP4 MySQL Session Handler" code from Ying
			## Zhang <ying@zippydesign.com>. His code was modified to
			## suit our needs.
			##
			## Note: for good session management operation, you need to set up in
			## the 'php.ini' file the variables `session.gc_maxlifetime'
			## (e.g. 86400 to mean 1 day) and `session.cookie_lifetime' to
			## zero (session holds until user closes his browser). In
			## adddition, the garbage collector should be called explicitely
			## via `admin/gc.shtml' if you choose `session.gc_probability'
			## to be zero in the `php.ini' file.

			## This file is part of the CERN Document Server Software (CDSware).
			## Copyright (C) 2002 CERN.
			##
			## The CDSware 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.
			##
			## The CDSware 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 CDSware; if not, write to the Free Software Foundation, Inc.,
			## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

			## read config variables:
			#include "config.wml"
			#include "configbis.wml"

			<?

			$DBHOST = "<DBHOST>";
			$DBUSER = "<DBUSER>";
			$DBPASS = "<DBPASS>";
			$DBNAME = "<DBNAME>";
			$WEBDIR = "<WEBDIR>";
			$WEBURL = "<WEBURL>";
			$ADMINEMAIL = "<ADMINEMAIL>";
			$IMAGES = "<WEBURL>/img";

			### okay, config read, from now on the script can continue ###

			<protect>

			$SESS_DBHOST = $DBHOST; /* database server hostname */
			$SESS_DBNAME = $DBNAME; /* database name */
			$SESS_DBUSER = $DBUSER; /* database user */
			$SESS_DBPASS = $DBPASS; /* database password */

			$SESS_DBH = "";
			$SESS_LIFE = get_cfg_var("session.gc_maxlifetime");

			## sess_open():
			function sess_open($save_path, $session_name) {
			global $SESS_DBHOST, $SESS_DBNAME, $SESS_DBUSER, $SESS_DBPASS, $SESS_DBH;

			if (! $SESS_DBH = mysql_pconnect($SESS_DBHOST, $SESS_DBUSER, $SESS_DBPASS)) {
			echo "<li>Can't connect to $SESS_DBHOST as $SESS_DBUSER";
			echo "<li>MySQL Error: ", mysql_error();
			die;
			}

			if (! mysql_select_db($SESS_DBNAME, $SESS_DBH)) {
			echo "<li>Unable to select database $SESS_DBNAME";
			die;
			}

			return true;
			}

			## sess_close():
			function sess_close() {
			return true;
			}

			## sess_read():
			function sess_read($key) {
			global $SESS_DBH, $SESS_LIFE;

			$qry = "SELECT session_vars FROM session WHERE session_key = '$key'";
			$qid = mysql_query($qry, $SESS_DBH);

			if (list($value) = mysql_fetch_row($qid)) {
			return $value;
			}

			return '';
			}

			## sess_write():
			function sess_write($key, $val) {
			global $SESS_DBH, $SESS_LIFE;

			$expiry = time() + $SESS_LIFE;
			$value = addslashes($val);

			$qry = "INSERT INTO session VALUES ('$key', '$value', $expiry)";
			$qid = mysql_query($qry, $SESS_DBH);

			if (! $qid) {
			$qry = "UPDATE session SET session_expiry = $expiry, session_vars = '$value' WHERE session_key = '$key'";
			$qid = mysql_query($qry, $SESS_DBH);
			}

			return $qid;
			}

			## sess_destroy():
			function sess_destroy($key) {
			global $SESS_DBH;
			displayMessage("Info",
			"sess_destroy called",
			"logfile");

			$qry = "DELETE FROM session WHERE session_key = '$key'";
			$res = mysql_query($qry, $SESS_DBH);

			return $res;
			}

			###########################################################################
			# Garbage Collector
			#
			# 1) Delete expired sessions
			# 1b)Delete guest users without session
			# 2) Delete queries not attached to any user
			# 3) Delete baskets not attached to any user
			# 4) Delete records not stored in any basket
			# 5) Delete formats not attached to any user
			#
			function sess_gc($maxlifetime) {
			global $SESS_DBH;
			global $uid;

			# when we started (used for profiling information, see below):
			list($mt_msec,$mt_sec) = split(" ", microtime());
			$mt_start = $mt_sec+$mt_msec;
			displayMessage("Info",
			"Garbage collector: started.",
			"screen,logfile");


			# Destroy expired sessions
			$query = "DELETE FROM session WHERE session_expiry < " . time();
			$result = mysql_perform_query($query, $SESS_DBH);
			displayMessage("Info",
			"Garbage collector: deleting " . mysql_affected_rows($SESS_DBH) . " expired sessions.",
			"screen,logfile");


			# Delete guest users without session.
			# The LEFT JOIN method cannot be applied here because there is no simple
			# way to compare the user id in table user with the one encoded in
			# session_vars in table session.
			#
			# backup of current uid
			$old_uid = $uid;

			$query = "SELECT session_vars FROM session";
			$result = mysql_perform_query($query, $SESS_DBH);
			$nRows = mysql_num_rows($result);
			if($nRows) {
			$cur_svar=mysql_fetch_row($result);
			$uidStr = "$uid";
			while($cur_svar = mysql_fetch_row($result)) {
			session_decode($cur_svar[0]);
			$uidStr .= ",$uid";
			}
			}

			# restoration of the previous uid
			$uid = $old_uid;

			if($uidStr != "") {
			$query = "DELETE FROM user WHERE id NOT IN (".$uidStr.") AND email = ''";
			$result = mysql_perform_query($query, $SESS_DBH);
			$nRows = mysql_affected_rows($SESS_DBH);
			}
			else
			$nRows = 0;

			displayMessage("Info",
			"Garbage collector: deleting " . $nRows . " guest users without session",
			"screen,logfile");


			# Delete queries not attached to any user.
			# Select user ids appearing in table user_query but not in table user
			$query = "SELECT DISTINCT uq.id_user
			FROM user_query AS uq LEFT JOIN user AS u
			ON uq.id_user = u.id
			WHERE u.id IS NULL";
			$result = mysql_perform_query($query, $SESS_DBH);
			$nRows = mysql_num_rows($result);
			# delete them one by one
			for($i=0; $i<$nRows; $i++) {
			$curRow = mysql_fetch_row($result);
			$query = "DELETE FROM user_query WHERE id_user = $curRow[0]";
			$result2 = mysql_perform_query($query, $SESS_DBH);
			}


			# Delete queries not attached to any user.
			# Select queries that must be deleted (the ones that are not in user_query)
			$query = "SELECT DISTINCT q.id
			FROM query AS q LEFT JOIN user_query AS uq ON uq.id_query = q.id
			WHERE uq.id_query IS NULL
			AND q.type<>'p'";
			$result = mysql_perform_query($query, $SESS_DBH);
			displayMessage("Info",
			"Garbage collector: deleting " . mysql_num_rows($result) . " queries.",
			"screen,logfile");

			# delete them one by one
			for($i=0; $i<mysql_num_rows($result); $i++) {
			$curRow = mysql_fetch_row($result);
			$query = "DELETE FROM query WHERE id = $curRow[0]";
			$result2 = mysql_perform_query($query, $SESS_DBH);
			}


			# Delete baskets not owned by any user
			# Select basket ids
			$query = "SELECT us.id_shelf
			FROM user_shelf AS us LEFT JOIN user AS u
			ON u.id = us.id_user
			WHERE u.id IS NULL";
			$result = mysql_perform_query($query, $SESS_DBH);
			$nRows = mysql_num_rows($result);
			displayMessage("Info",
			"Garbage collector: deleting " . $nRows . " baskets not owned by any user.",
			"screen,logfile");
			# delete them one by one
			for($i=0; $i<$nRows; $i++) {
			$curRow = mysql_fetch_row($result);
			$query = "DELETE FROM user_shelf WHERE id_shelf = $curRow[0]";
			$result2 = mysql_perform_query($query, $SESS_DBH);
			$query = "DELETE FROM shelf WHERE id = $curRow[0]";
			$result2 = mysql_perform_query($query, $SESS_DBH);
			}


			# Delete entries from table shelf_record that don't correspond to any existing record
			$query = "SELECT sr.id_shelf FROM shelf_record AS sr LEFT JOIN shelf AS s ON s.id = sr.id_shelf
			WHERE s.id IS NULL";
			$result = mysql_perform_query($query, $SESS_DBH);
			$nRows = mysql_num_rows($result);
			for($i=0; $i<$nRows; $i++) {
			$curRow = mysql_fetch_row($result);
			$query = "DELETE FROM shelf_record WHERE id_shelf = $curRow[0]";
			$result2 = mysql_perform_query($query, $SESS_DBH);
			}

			# Delete records not in any shelf
			$query = "SELECT DISTINCT r.id FROM record AS r LEFT JOIN shelf_record AS sr ON r.id = sr.id_record
			WHERE sr.id_record IS NULL";
			$result = mysql_perform_query($query, $SESS_DBH);
			$nRows = mysql_num_rows($result);
			displayMessage("Info",
			"Garbage collector: deleting " . $nRows . " records not in any shelf.",
			"screen,logfile");
			for($i=0; $i<$nRows; $i++) {
			$curRow = mysql_fetch_row($result);
			$query = "DELETE FROM record WHERE id = $curRow[0]";
			$result2 = mysql_perform_query($query, $SESS_DBH);
			}

			# Delete formats not attached to any user
			$query = "SELECT DISTINCT f.id FROM format AS f LEFT JOIN user_format AS uf
			ON f.id = uf.id_format WHERE uf.id_user IS NULL";
			$result = mysql_perform_query($query, $SESS_DBH);
			$nRows = mysql_num_rows($result);
			displayMessage("Info",
			"Garbage collector: deleting " . $nRows . " formats not attached to any user.",
			"screen,logfile");
			for($i=0; $i<$nRows; $i++) {
			$curRow = mysql_fetch_row($result);
			$query = "DELETE FROM format WHERE id = $curRow[0]";
			$result2 = mysql_perform_query($query, $SESS_DBH);
			}

			# add some profiling info to the runtime logfile
			list($mt_msec,$mt_sec) = split(" ", microtime());
			$mt_end = $mt_sec+$mt_msec; $mt = $mt_end-$mt_start; $mt_start=$mt_end;
			displayMessage("Info",
			"Garbage collector took " .sprintf("%.2f",$mt) ." sec to execute.",
			"screen,logfile");

			return $nb_sess_deleted;
			}

			session_set_save_handler(
			"sess_open",
			"sess_close",
			"sess_read",
			"sess_write",
			"sess_destroy",
			"sess_gc");

			## getEmail():
			function getEmail($uid) {
			global $SESS_DBH;
			$uid_email = "guest";
			$query = "SELECT email FROM user WHERE id='$uid'";
			$res = mysql_perform_query($query, $SESS_DBH);
			if ($row = mysql_fetch_row($res)) {
			if ($row[0]) {
			$uid_email = $row[0];
			}
			}
			mysql_free_result($res);
			return($uid_email);
			}

			## getPW():
			function getPW($uid) {
			global $SESS_DBH;
			$uid_pw = "";
			$query = "SELECT password FROM user WHERE id='$uid'";
			$res = mysql_perform_query($query, $SESS_DBH);
			if ($row = mysql_fetch_row($res)) {
			if ($row[0]) {
			$uid_pw = $row[0];
			}
			}
			mysql_free_result($res);
			return($uid_pw);
			}

			## getID():
			function getID($email) {
			global $SESS_DBH;
			$uid_id = "";
			$query = "SELECT id FROM user WHERE email='$email'";
			$res = mysql_perform_query($query, $SESS_DBH);
			if ($row = mysql_fetch_row($res)) {
			if ($row[0]) {
			$uid_id = $row[0];
			}
			}
			mysql_free_result($res);
			return($uid_id);
			}

			## displayLoginInfo():
			function displayLoginInfo($uid) {
			$uid_email = getEmail($uid);
			# $out = "<table cellspacing=0 cellpadding=0 border=0><tr><td>   </td><td colspan=5 align=left class=loginselected><small><strong class=loginselectedtext>Your ID:</strong> $uid_email</td></tr><tr><td>   </td><td align=center class=login><small><a href=\"${WEBDIR}personalize/youraccount.shtml?action=login\">login</a></small> </td><td align=center class=login> <small><a href=\"${WEBDIR}personalize/youraccount.shtml?action=logout\">logout</a></small> </td><td align=center class=login> <small><a href=\"${WEBDIR}personalize/youraccount.shtml\">settings</a></small> </td><td align=center class=login> <small><a href=\"${WEBDIR}yourshelf.shtml\">basket</a></small> </td><td align=center class=login> <small><a href=\"${WEBDIR}yourprofile.shtml\">alert</a></small></td></tr></table>";
			$out = "<span>[$uid_email]</span>";
			return $out;
			}

			## expandOrCollapseURL():
			function expandOrCollapseURL($base,$req,$mn) {
			$x = $base . $req;
			$mn = preg_replace("/\[/","\[",$mn);
			$mn = preg_replace("/\]/","\]",$mn);
			$x=preg_replace("/([&\?])SESSIONID=\w+/","\\1",$x);
			$x=preg_replace("/([&\?])$mn=\w/","\\1",$x);
			if (strstr($x,'?')) { $x.="&"; } else { $x.="?"; }
			$x .= session_name() . "=" . session_id();
			$x=preg_replace("/&+/","&",$x);
			return($x);
			}

			## displayYourFormatOptions():
			function displayYourFormatOptions($uid,$p_of) {
			global $SESS_DBH;
			$out = "";
			$query = "SELECT f.id,f.name FROM format f, user_format uf " .
			"WHERE uf.id_user='$uid' AND f.id=uf.id_format";
			$res = mysql_perform_query($query, $SESS_DBH);
			if (mysql_num_rows($res)) {
			while ($row = mysql_fetch_row($res)) {
			$out .= "<option value=\"$row[0]\"";
			if ($row[0] == $p_of) {
			$out .= " selected";
			}
			$out .= ">personal - $row[1]\n";
			}
			}
			mysql_free_result($res);
			return $out;
			}

			## getRandomTip():
			function getRandomTip($catalogue) {
			global $WEBDIR;
			# connect to mysql database:
			$problem=0;
			$dbh = mysql_pconnect($SESS_DBHOST,$SESS_DBUSER,$SESS_DBPASS) or $problem=1;
			if (!$problem) {
			mysql_select_db($SESS_DBNAME) or $problem=1;
			if (!$problem) {
			# getting all tips for $catalogue:
			$query = "SELECT type,message FROM tip WHERE base='$catalogue'";
			$res = mysql_query($query, $dbh) or $problem=1;
			if (!$problem) {
			if (mysql_num_rows($res)) {
			while ($row = mysql_fetch_row($res)) {
			$tip_type[] = $row[0];
			$tip_message[] = $row[1];
			}
			} else {
			$squery = "SELECT type,message FROM tip WHERE base=''";
			$sres = mysql_query($squery, $dbh);
			while ($srow = mysql_fetch_row($sres)) {
			$tip_type[] = $srow[0];
			$tip_message[] = $srow[1];
			}
			mysql_free_result($sres);
			}
			mysql_free_result($res);
			if (count($tip_type)) {
			# getting random tip:
			srand((double)microtime()*1000000);
			if (count($tip_type)>1) {
			$rnd=rand(1,count($tip_type))-1;
			} else {
			$rnd=0;
			}
			# $rndtip = "<img src=\"".$WEBDIR."/img/r.gif\" alt=\"\"> <small>" .
			# "<span class=quicknote>$tip_type[$rnd]:</span> " .
			# "$tip_message[$rnd]</small>";
			$rndtip = "<small><strong>$tip_type[$rnd]:</strong> " .
			"$tip_message[$rnd]</small>";
			}
			}
			}
			}
			if ($rndtip) {
			$rndtip .= " <small>(<a href=\"".$WEBDIR."/tips.shtml\">read all tips</a>)</small>";
			}
			return $rndtip;
			}

			## getLatestCDSNews():
			function getLatestCDSNews() {
			# connect to mysql database:
			$problem=0;
			$cdsdbh = mysql_pconnect($SESS_DBHOST,$SESS_DBUSER,$SESS_DBPASS) or $problem=1;
			if ($cdsdbh && !$problem) {
			mysql_select_db("cdsnews") or $problem=1;
			if (!$problem) {
			# getting last CDS news:
			$query = "SELECT MAX(id) FROM news";
			$res = mysql_query($query, $cdsdbh) or $problem=1;
			if (!$problem) {
			if (mysql_num_rows($res)) {
			if ($row = mysql_fetch_row($res)) {
			$maxid=$row[0];
			$squery = "SELECT date,synopsis FROM news WHERE id=$maxid";
			$sres = mysql_query($squery, $cdsdbh) or $problem=1;
			if (!$problem) {
			if (mysql_num_rows($sres)) {
			if ($row = mysql_fetch_row($sres)) {
			$out = "<small><strong>$row[0]:</strong> $row[1]</small>";
			$out .= " <small>(<a href=\"http://cds.cern.ch/news.shtml?id=$maxid\">read more</a> \| <a href=\"http://cds.cern.ch/news.shtml\">subscribe</a>)</small>";
			}
			mysql_free_result($sres);
			}
			}
			}
			mysql_free_result($res);
			}
			}
			}
			}
			return $out;
			}

			## getSearchExample():
			function getSearchExample($id_collection, $all=0) {
			## Returns search examples for given collection.
			## If all=0, returns random search example. If all!=0, returns all examples.
			global $WEBURL;
			global $SESS_DBH;
			$out = "";
			# getting all examples for $catalogue:
			$query = "SELECT e.type,e.body FROM example AS e, collection_example AS ce ".
			"WHERE ce.id_collection='".$id_collection."' AND e.id=ce.id_example";
			$res = mysql_query($query, $SESS_DBH) or $problem=1;
			if (!$problem) {
			if (mysql_num_rows($res)) {
			while ($row = mysql_fetch_row($res)) {
			$example_type[] = $row[0];
			$example_body[] = $row[1];
			}
			}
			mysql_free_result($res);
			if (count($example_type)) {
			if ($all) {
			# case A - return all examples:
			for ($i=0; $i<count($example_type); $i++) {
			$indxs[] = $i;
			}
			} else {
			## case B - return random example: [this is the default behaviour]
			srand((double)microtime()*1000000);
			if (count($example_type)>1) {
			$indxs[] = rand(1,count($example_type))-1;
			} else {
			$indxs[] = 0;
			}
			}
			# return chosen example(s):
			for ($i=0; $i<count($indxs); $i++) {
			if ($out) {
			$out .= "<br>";
			}
			$out .= "<img src=\"".$WEBURL."/img/r.gif\" alt=\"\"> <small>" .
			"<span class=quicknote>Example (".$example_type[$indxs[$i]]."):</span> " .
			$example_body[$indxs[$i]]."   ";
			if ($all) {
			$out .= "[<a href=\"".$PHP_SELF."?se=0\">close</a>]</small>";
			} else {
			$out .= "[<a href=\"".$PHP_SELF."?se=1\">more</a>]</small>";
			}
			}
			}
			}
			return $out;
			}

			## createNavigationBar():
			function createNavigationBar() {
			global $PHP_SELF, $mn;
			$n = func_num_args();
			$a = func_get_args();
			$out = "\n<table width=\"100%\"><tr><td class=\"about\">";
			if ($mn == "b") {
			$out .= "<a class=\"img\" href=\"$PHP_SELF?mn=d\"><img width=\"16\" src=\"".$WEBDIR."/img/iconnext.gif\" border=0 alt=\"o\"></a>";
			} else {
			$out .= "<a class=\"img\" href=\"$PHP_SELF?mn=b\"><img width=\"16\" src=\"".$WEBDIR."/img/iconcross.gif\" border=0 alt=\"x\"></a>";
			}
			$out .= "<small>";
			for ($i=0; $i < $n; $i++) {
			list ($url,$txt) = $a[$i];
			if ($url) {
			$out .= "<a href=\"".$WEBDIR."/".$url."\">".$txt."</a> > ";
			} else {
			$out .= $txt . " > ";
			}
			}
			$out = substr($out, 0, -6);
			$out .= "</small></td></tr></table>";
			return $out;
			}

			## createGuestUser():
			function createGuestUser() {
			global $SESS_DBH;
			mysql_query("INSERT INTO user (id) VALUES (NULL)", $SESS_DBH) or die("<p>".mysql_error());
			if (mysql_affected_rows($SESS_DBH)) { # to check whether the above insert failed or not
			$uid = mysql_insert_id($SESS_DBH);
			session_register("uid");
			} else {
			displayMessage("Error",
			"Unable to create new guest user",
			"logfile");
			$uid = 0;
			}
			return $uid;
			}

			function authenticate($email,$rule,$doctype="",$action="")
			{
			global $ADMINEMAIL;

			if (eregi($ADMINEMAIL,"$email"))
			return true;

			$res = mysql_query("select id from rules where name='superuser'");
			$row = mysql_fetch_row($res);
			$id_superuser = $row[0];

			$res = mysql_query("select id_user from user_rule where id_rule='${id_superuser}' and (param1='$doctype' or param1='') and (param2 LIKE '$action' or param2='')");
			while ($row = mysql_fetch_row($res))
			{
			$iduser = $row[0];
			$emailuser = getEmail($iduser);
			if (eregi("$email","$emailuser"))
			return true;
			}

			$res = mysql_query("select id from rules where name='$rule'");
			if (mysql_num_rows($res) == 0)
			return false;
			else
			{
			$row = mysql_fetch_row($res);
			$idrule = $row[0];
			$res = mysql_query("select id_user from user_rule where id_rule='$idrule' and (param1 LIKE '$doctype' or param1='') and (param2 LIKE '$action' or param2='')");
			while ($row = mysql_fetch_row($res))
			{
			$iduser = $row[0];
			$emailuser = getEmail($iduser);
			if (eregi("$email","$emailuser"))
			return true;
			}
			return false;
			}
			}

			function getRuleID($rule)
			{
			////////////////////////////
			// get the id of the rule //
			////////////////////////////
			$res = mysql_query("
			SELECT id
			FROM rules
			WHERE name='$rule'");
			if (mysql_num_rows($res) == 0)
			{
			// if it does not exist, attempt to create it
			$res = mysql_query("
			INSERT
			INTO rules (name,description)
			VALUES ('$rule','')");
			$idrule = mysql_insert_id();
			}
			else
			{
			$row = mysql_fetch_row($res);
			$idrule = $row[0];
			}

			return $idrule;
			}

			function getNumberOfBaskets() {
			global $SESS_DBH;
			global $SESS_LIFE;
			$count = 0;

			$query = "SELECT COUNT(*) FROM shelf";
			$result = mysql_perform_query($query, $SESS_DBH);
			if(mysql_num_rows($result)) {
			$row = mysql_fetch_row($result);
			$count = $row[0];
			}

			return $count;
			}

			function getNumberOfRegisteredUsers() {
			global $SESS_DBH;
			global $SESS_LIFE;
			$count = 0;

			$query = "SELECT COUNT(*) FROM user WHERE email <> ''";
			$result = mysql_perform_query($query, $SESS_DBH);
			if(mysql_num_rows($result)) {
			$row = mysql_fetch_row($result);
			$count = $row[0];
			}

			return $count;
			}

			function getNumberOfAlerts() {
			global $SESS_DBH;
			global $SESS_LIFE;
			$count = 0;

			$query = "SELECT COUNT(*) FROM user_query_shelf";
			$result = mysql_perform_query($query, $SESS_DBH);
			if(mysql_num_rows($result)) {
			$row = mysql_fetch_row($result);
			$count = $row[0];
			}

			return $count;
			}

			## getNumberOfSessions():
			function getNumberOfSessions($time_diff) {
			# returns nb of active sessions that were created not longer than $time_diff seconds ago
			global $SESS_DBH;
			global $SESS_LIFE;

			# 0) argument check:
			if ($time_diff > $SESS_LIFE) {
			# if desired $time_diff is greater than session lifetime, then garbage collector
			# might have run and the result would not be meaningful => we need to set
			# maximum $time_diff that is available, i.e. $SESS_LIFE
			$time_diff = $SESS_LIFE;
			}

			# 1) find out the number of sessions:
			$num_sessions = "unknown";
			$since_when = time() + $SESS_LIFE - $time_diff;
			$query = "SELECT COUNT(*) FROM session WHERE session_expiry > $since_when";
			$res = mysql_query($query, $SESS_DBH);
			if (mysql_num_rows($res)) {
			if ($row = mysql_fetch_row($res)) {
			$num_sessions = $row[0];
			}
			mysql_free_result($res);
			}

			# 2) find out the number of queries:
			$num_queries = "unknown";
			$query = "SELECT COUNT(*) FROM user_query WHERE date > DATE_SUB(NOW(), INTERVAL $time_diff SECOND);";
			$res = mysql_query($query, $SESS_DBH);
			if (mysql_num_rows($res)) {
			if ($row = mysql_fetch_row($res)) {
			$num_queries = $row[0];
			}
			mysql_free_result($res);
			}

			$out = "<small>There have been <strong>" . $num_sessions . "</strong> active users " .
			"in the past " . sprintf("%d",$time_diff/60) . " minutes. ".
			"They have made <strong>" . $num_queries . "</strong> queries.</small>";

			return $out;
			}

			###
			# function to call as an alternative to mysql_query
			# the function stops the execution if the query couldn't be executed
			# and prints an error message (HTML formatted) (default behaviour)
			# if behaviour is set to 'continue', then the function just goes on
			#
			function mysql_perform_query($query, $link_identifier, $behaviour="die") {
			if($behaviour == "continue")
			$result = mysql_query($query, $link_identifier);
			else {
			$result = mysql_query($query, $link_identifier)
			or die ("<p>MySQL: could not execute your query<br>$query" .
			"<br>Contact the <a href=\"mailto:search.support@cds.cern.ch\">" .
			"CDS Support Team</a>.<br>" .
			"Error " . mysql_errno($link_identifier) .
			": " . mysql_error($link_identifier) . ".</p>");
			}

			return $result;
			}

			## displayMessage():
			function displayMessage($type, $msg, $where = "screen") {
			global $IMAGES;
			if (eregi("screen",$where)) {
			echo "\n<p><table><tr><td class=\"devel\"><strong><img src=\"".$IMAGES."/r.gif\" alt=\"*\"> ".
			"$type:</strong> $msg</td></tr></table>\n";
			}
			if (eregi("logfile",$where)) {
			$logfile = "__RUNTIMELOGFILE__";
			$fp = fopen($logfile, "a") or die("unable to open file " .$logfile);
			if($fp) {
			$buf = "$type: $msg [" .date("Y-m-d H:i:s") ."]\n";
			fwrite($fp, $buf);
			fclose($fp);
			}
			}
			}


			## displayLoginMenu()
			function displayLoginMenu($type) {
			global $WEBDIR,$WEBURL,$uid_email,$doctypes;

			print '<table width=100% cellpadding=0 cellspacing=0 border=0>';
			print '<tr><td> <small><b>PERSONALIZE</b></small></td></tr>';
			if ($uid_email != "" && $uid_email != "guest")
			{
			print '<tr><td>'
			. '<form action="'.$WEBURL.'/personalize/youraccount.shtml?action='
			. 'logout" method="post"><small>   <strong>logged in as:</strong>'
			. '<br><font color="green">    '.$uid_email.'</font>'
			. '</td></tr>';

			if (authenticate($uid_email,'superuser'))
			{
			print '<tr><td><font size="-1">   <strong>superuser: </strong>'
			. '</font></td></tr>';
			print '<tr><td><font size="-1">    '
			. '<A href="'.$WEBURL.'/admin">'
			. 'administrative area</A></font></td></tr>';
			}

			if ($type == "search")
			{
			print '<tr><td><font size="-1">    '
			. '<A href="'.$WEBURL.'/personalize/youralerts.shtml">'
			. 'Your Alerts</A></font></td></tr>';
			print '<tr><td><font size="-1">    '
			. '<A href="'.$WEBURL.'/personalize/yourbaskets.shtml">'
			. 'Your Baskets</A></font></td></tr>';
			print '<tr><td><font size="-1">    '
			. '<A href="'.$WEBURL.'/personalize/yoursearches.shtml">'
			. 'Your Searches</A></font></td></tr>';
			print '<tr><td><font size="-1">    '
			. '<A href="'.$WEBURL.'/personalize/yoursettings.shtml">'
			. 'Your Settings</A></font></td></tr>';
			}

			if ($type == "submit")
			{
			$res = mysql_query("
			SELECT *
			FROM sbmSUBMISSIONS
			WHERE email='$uid_email' and
			status='pending'");

			$numpending = mysql_num_rows($res);
			$res = mysql_query("
			SELECT *
			FROM sbmSUBMISSIONS
			WHERE email='$uid_email' and
			status='finished'");

			$numfinished = mysql_num_rows($res);

			if ($doctypes != "account" \|\| $numpending != 0 \|\| $numfinished != 0)
			print '<tr><td><font size="-1">   <strong>view: </strong>'
			. '</font></td></tr>';

			if ($doctypes != "account")
			print '<tr><td><font size="-1">    '
			. '<A href="'.$WEBURL.'/personalize/youraccount.shtml">your account'
			. '</A></font></td></tr>';

			if ($numpending != 0)
			print '<tr><td><font size="-1">    '
			. '<A href="'.$WEBURL.'/submit/mycds/pending.shtml">your pending'
			. ' submissions</A></font></td></tr>';

			if ($numfinished != 0)
			print '<tr><td><font size="-1">    '
			. '<A href="'.$WEBURL.'/submit/mycds/finished.shtml">your completed'
			. ' submissions</A></font></td></tr>';

			$res = mysql_query("
			SELECT *
			FROM sbmDOCTYPE
			WHERE sdocname='$doctypes'");
			if ($doctypes != "Main"
			&& mysql_num_rows($res) != 0
			&& authenticate("$uid_email","canView","$doctypes"))
			print '<tr><td><font size="-1">    '
			. '<A href="'.$WEBURL.'/submit/mycds/submitlist.shtml?doctype='.$doctypes.'">'
			. 'all completed submissions</A></font></td></tr>';

			// Simple approval process
			if (authenticate("$uid_email","referee","%","%"))
			print '<tr><td><font size="-1">    '
			. '<A href="'.$WEBURL.'/submit/mycds/simpleapproval.shtml?doctype='
			. $doctypes.'">the documents I referee</A></font></td></tr>';

			}

			print '<tr><td><small><input type="submit" name="action" '
			. 'value="logout"></small></form></td></tr>';
			}
			else
			{
			if (isset($SuE))
			$initialEmail = $SuE;
			else
			$initialEmail = "$uid_email";
			print '<tr><td><form action="'.$WEBURL
			. '/personalize/youraccount.shtml?action=login" method="post"><small>'
			. '<strong>Email:</strong>';
			print '<br><input type="text" size="13" name="p_email" value="'
			. $initialEmail.'">';
			print '<br><strong>Password:</strong>';
			print '<br><input type="password" size="13" name="p_pw" '
			. 'value="">';
			print '<br><input type="submit" name="action" value="login">';
			print ' (<a href="'.$WEBURL.'/personalize/youraccount.shtml?'
			. 'action=register">new user?</a>)';
			print '</small></form></td></tr>';
			}
			print '</table>';
			}

			session_start();
			if (!session_is_registered("uid")) {
			$uid = createGuestUser();
			}
			$uid_email = getEmail($uid);
			?>
			</protect>

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R3600/modules/websession/web/sessinit.inc.shtml.wml
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