//////////////////////////////////////////////
// Guest Page View Limit 1.2
//////////////////////////////////////////////
// Developed by TPH Thurnok
// TinyPortal Hosting - Your premier TP/SMF host
// http://www.tinyportalhosting.com
// November 16, 2006
//
// Last update: March 10, 2007
//    added &gpvl=exceeded to redirect so scripting can be done in registration
//    to allow detecting user got there by exceeding the page view limit
//
// This is designed for a phpblock.
// This allows you to limit the number of pages a guest can view on your site
// before being redirected to the registration page.
//
// Requirements:
// In order for this to work, you must place this in a phpblock that is displayed
// on all pages.  For any pages where this block is not displayed, that page will
// not be counted against the guest.  It is recommended you do not display a title
// or frame for the block so that it is basically invisible to the user.
//
// This script will create a table for the storage of IPs and the count of pages.
// It is a very simple IP based count.  No session info or other info is used.
// Therefore, if you set this to a very high value, and a user has a dynamic IP, you
// may be ineffective as the user may simply get a new IP the next time they visit your site.
//
//////////////////////////////////////////////

/*
****************************************
****************************************
*** !! User Configuration Section !! ***
****************************************
****************************************
*/
// Set the maximum number of pages you want to limit a normal guest to view
$gpvl_MaxPages = 3;
// Set the maximum number of pages to limit "special" guests to (usually for high limit guests)
$gpvl_MaxPagesSpecial = 1000;

// Set the IPs for "special" guests in an array - Example: array('12.1.4.70', '3.88.129.211', '42.150.220.200');
$gpvl_SpecialIPs = array();

// Set the IPs you want excluded from the limit - like google/spiders etc. in an array - same format as "special" guest array
$gpvl_ExcludeIPs = array('127.0.0.1');

// set the table name you want to use (without a prefix - prefix will be auto added)
$gpvl_table = 'guest_page_limit';
/*
****************************************
****************************************
*/

//////////////////////////////////////////////
//
// The rest of this you should leave as is
// unless you are overly industrious :)
//
//////////////////////////////////////////////
// globals for database vars
global $db_prefix, $tp_prefix;
// globals for user information
global $context, $scripturl;

// fix for TP 0.8.6 and lower
if (empty($tp_prefix)){
$tp_prefix = $settings['tp_prefix'];
}
$gpvl_table = $tp_prefix . $gpvl_table;

$myself = $_SERVER['REQUEST_URL'];
// first seperate the parameters from the URL, to avoid possible search string in the URL itself
$parms = str_replace($scripturl, "", $myself);
// then see if we are actually at the registration page (action=register)
$gpvl_at_register = stristr($parms, "action=register") ? true : false;
// or if we are at the login page (action=login)
$gpvl_at_login = stristr($parms, "action=login") ? true : false;
// or if we are at the password reminder page (action=reminder)
$gpvl_at_reminder = stristr($parms, "action=reminder") ? true : false;

// only for limiting guests, so if not a guest - get out (unless at registration/login/reminder page)
if ($context['user']['is_guest'] && !$gpvl_at_register && !$gpvl_at_login && !$gpvl_at_reminder){
// preset to max pages in case we fall thru
$gpvl_NumPages = $gpvl_MaxPages;

// what is our IP?
$gpvl_ip = empty($_SERVER['REMOTE_ADDR']) ? getenv('REMOTE_ADDR') : $_SERVER['REMOTE_ADDR'];
// if we got an IP (and it is not an excluded IP), do the work, otherwise, send them to registration
if ($gpvl_ip && strtoupper($gpvl_ip) != "NULL"){
if (in_array($gpvl_ip, $gpvl_ExcludeIPs)){
$gpvl_NumPages = 0;
} else {
// if they are a "special" guest, set their max pages to the "special" max pages setting
if (in_array($gpvl_ip, $gpvl_SpecialIPs)){
$gpvl_MaxPages = $gpvl_MaxPagesSpecial;
}
// test for table existance
$gpvl_result = @mysql_query('SELECT pageviews FROM '.$gpvl_table.' WHERE ip = "'.$gpvl_ip.'" LIMIT 1');
if (!$gpvl_result){
if (mysql_errno() == 1146){
// table doesn't exist, create it!
@mysql_query('CREATE table '.$gpvl_table.'(ip TEXT, pageviews INT UNSIGNED NOT NULL)');
$gpvl_NumPages = 1;
@mysql_query('INSERT INTO '.$gpvl_table.' VALUES ("'.$gpvl_ip.'", 1)');
} else {
die("Guest Page View Limit - Unexpected error: " . mysql_error());
}
} else {
if (mysql_num_rows($gpvl_result)){
// found this IP already in table
$row = mysql_fetch_assoc($gpvl_result);
$gpvl_NumPages = $row['pageviews'] + 1;
@mysql_query('UPDATE '.$gpvl_table.' SET pageviews = '.$gpvl_NumPages.' WHERE ip = "'.$gpvl_ip.'"');
} else {
// not in table yet, insert it
$gpvl_NumPages = 1;
@mysql_query('INSERT INTO '.$gpvl_table.' VALUES ("'.$gpvl_ip.'", 1)');
}
mysql_free_result($gpvl_result);
}
}
}

// Send to registration if they are at or above max pages
if ($gpvl_NumPages > 0 && $gpvl_NumPages >= $gpvl_MaxPages){
header("Location: ".$scripturl."?action=register&gpvl=exceeded");
}
}