Create unique link (one time click) with expiration time [closed] - php

Question

Closed. This question needs details or clarity. It is not currently accepting answers.
Want to improve this question? Add details and clarify the problem by editing this post.
Closed 9 years ago.
Improve this question
I want to create unique links (one time click) for my newsletters.
Look the steps:
I will create a link, or can be a script that will create the link http://www.example.com/page.php?unique=email#email.com
My subscriber will receive a newsletter which contains this link.
They click/visit this newsletter/link.
If they want visit it again they can't, the link will be expired, and the subscriber will be redirected to other page http://www.example.com/expired.php
So is there any chance to create this? How can this be accomplished?
I have this code
<?php
include("variables.php");
$password = trim($_SERVER['QUERY_STRING']);
if($password == ADMIN_PASSWORD) {
// Create a new key
$new = uniqid('key',TRUE);
if(!is_dir('keys')) {
mkdir('keys');
$file = fopen('keys/.htaccess','w');
fwrite($file,"Order allow,deny\nDeny from all");
fclose($file);
}
$file = fopen('keys/keys','a');
fwrite($file,"{$new}\n");
fclose($file);
?>
This script is located in a file named generate.php and if I access this url ( http://www.example.com/generate.php?1234 - 1234 is the password to generate a unique ID) will generate a unique link like this http://www.example.com/page.php?key525e1200e3a5f9.19949496 that will be only 1 time available!
Now what I want is, to access http://www.example.com/generate.php?1234&s=email#email.com
And this this generate a unique link http://www.example.com/page.php?key525e1200e3a5f9.19949496&s=email#email.com
This is for a protected download page! I need to add the user email to the download page, and this to be generated by link. 's' is the variable that will be get by the download page using $_GET['s']
Understand what I mean?

Answer 1

I would do this using there email.
Then do a PHP page with the following statements.
Request the GET (in this case the email address) and check if it exists in database table (lets call this - hasvisited).
IF this exists then redirect to page you want.
If doesnt exist then...
1.) Add it to DB.
2.) display 1 time page.
When step 1 happens. it will stop the user from visiting again.
If you want to restrict this to a group of specific users - as the above solution people could theoritcally type anything to get past this...
I would create table with the users already and do an IF state on a column called 'visits' and if 1 or less allow and add +1 to visits column. if above 1 visit then redirect.
I hope this make sense - should also be fairly simple to implement using PHP, MySQL DB and simple IF statement.