[Xerte-dev] Re: $_SERVER['HTTP_REFERER'] issue

[Julian Tenney]

Yeah, I saw that, but it means modifying the page hosting the link. And that could be anywhere. For internal systems I can see some solutions, but to have it work on other systems elsewhere is looking more difficult.

From: xerte-dev-bounces at lists.nottingham.ac.uk [mailto:xerte-dev-bounces at lists.nottingham.ac.uk] On Behalf Of Dave Burnett
Sent: 26 January 2012 13:12
To: xerte-dev at lists.nottingham.ac.uk
Subject: [Xerte-dev] Re: $_SERVER['HTTP_REFERER'] issue

The few posts regarding all ultimately say "never use referrer anyway" as you can't trust it.

Most recommend building your own logic:

http://stackoverflow.com/questions/3966059/alternative-for-serverhttp-referer-php-variable-in-msie



________________________________
From: Julian.Tenney at nottingham.ac.uk
To: xerte-dev at lists.nottingham.ac.uk
Date: Thu, 26 Jan 2012 12:59:05 +0000
Subject: [Xerte-dev] $_SERVER['HTTP_REFERER'] issue
Anyone got any bright ideas: when you set access to other, you can specify a domain to restrict access only to links being followed from that domain: so you can have some sort of gatekeeping in any system the user has to log in to, and then only allow access to links from that system.

This is the code, it uses $_SERVER['HTTP_REFERER'].

It doesn't work in IE. Cosmic.

Any alternative approaches without having to modify the linking system?

This is the code:

$test_string=substr($row_play['access_to_whom'],6,strlen($row_play['access_to_whom']));

if(strlen($_SERVER['HTTP_REFERER'])!=0){

       if(strpos($_SERVER['HTTP_REFERER'],$test_string)==0){

       mysql_query("UPDATE " . $xerte_toolkits_site->database_table_prefix . "templatedetails SET number_of_uses=number_of_uses+1 WHERE template_id=" . $safe_template_id);

       require $xerte_toolkits_site->root_file_path . "modules/" . $row_play['template_framework'] . "/play.php";

       show_template($row_play);

       }else{

       require $xerte_toolkits_site->root_file_path . "modules/" . $row_play['template_framework'] . "/play.php";

       dont_show_template();

       }

}else{

       //dont_show_template();
       //going to show it anyway, as referer doesn't work in IE
       require $xerte_toolkits_site->root_file_path . "modules/" . $row_play['template_framework'] . "/play.php";

       show_template($row_play);

}

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