PHP ratelimiter

Related tags

Miscellaneous php-ratelimiter
Overview

php-ratelimiter

A small class that uses Memcache to allow only a certain number of requests per a certain amount of minutes.

The class works around the problem that the timeframe is constantly moving, i.e. every new minute the timeframe is different. See my blogpost.

The code is released under an MIT license.

Usage

limitRequestsInMinutes(100, 5); } catch (RateExceededException $e) { header("HTTP/1.0 529 Too Many Requests"); exit; }"> 
$rateLimiter = new RateLimiter(new Memcache(), $_SERVER["REMOTE_ADDR"]);
try {
	// allow a maximum of 100 requests for the IP in 5 minutes
	$rateLimiter->limitRequestsInMinutes(100, 5);
} catch (RateExceededException $e) {
	header("HTTP/1.0 529 Too Many Requests");
	exit;
}

Remarks

The script creates a memcached entry per IP and minute.

If you want to protect multiple resources with different limits, use the third parameter of the constructor to namespace it:

// script1.php
$rateLimiter = new RateLimiter(new Memcache(), $_SERVER["REMOTE_ADDR"], "script1");
try { ... }
// script2.php
$rateLimiter = new RateLimiter(new Memcache(), $_SERVER["REMOTE_ADDR"], "script2");
try { ... }

You can also use something else as a second parameter, for example a session_id to limit the requests per user instead of IP address.

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Comments
  • No servers added to memcache connection ERROR

    No servers added to memcache connection ERROR

    I'm having problems when trying to run the script

    Warning: Memcache::get(): No servers added to memcache connection in /public_html/path/to/script.php on line 45

    problem comes from this: $this->memcache->set($key, 1, 0, $minutes * 60 + 1);

    any thoughts on how to fix that?

    opened by thagxt 2
  • Adjusted for memcached

    Adjusted for memcached

    Hallo Alexander,

    For our own usage I adjusted this to work with memcached instead of memcache. If you're open to this you can merge. If you would rather keep it with memcache that's fine as well. In that case you might link to my version for people interested in the memcached version.

    Whatever you do, have a beautiful day!

    opened by kramer65 0
  • Call the rate limiter many times in the same php code with different limits

    Call the rate limiter many times in the same php code with different limits

    With this branch we can do this:

    $memcache = new Memcache;
$memcache->connect('127.0.0.1',11211);

$rateLimiter = new RateLimiter($memcache, $_SERVER["REMOTE_ADDR"]);
try {
    // 10 requests / minute
    $rateLimiter->limitRequestsInMinutes(10, 1);
} catch (RateExceededException $e) {
    header("HTTP/1.0 529 Too Many Requests");
    exit;
}

try {
    // 30 requests / 5 minute
    $rateLimiter->limitRequestsInMinutes(30, 5);
} catch (RateExceededException $e) {
    header("HTTP/1.0 529 Too Many Requests");
    exit;
}

    etc....

    opened by leonardoxc 0
Owner
Alex Kirk
Alex Kirk
GitHub http://alexander.kirk.at/2013/04/19/add-a-rate-limit-to-your-website/
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