Cache.php
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Cache.php
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	<?php

	namespace App\Policy\SPF;

	use Illuminate\Support\Facades\Cache as LaravelCache;

	/**
	* A caching layer for SPF check results, as sometimes the chasing of DNS entries can take a while but submissions
	* inbound are virtually not rate-limited.
	*
	* A cache key should have the format of ip(4\|6)_id_domain and last for 12 hours.
	*
	* A cache value should have a serialized version of the \SPFLib\Checker.
	*/
	class Cache
	{
	public static function get($key)
	{
	if (LaravelCache::has($key)) {
	return LaravelCache::get($key);
	}

	return null;
	}

	public static function has($key)
	{
	return LaravelCache::has($key);
	}

	public static function set($key, $value)
	{
	if (LaravelCache::has($key)) {
	LaravelCache::forget($key);
	}

	// cache the DNS record result for 12 hours
	LaravelCache::put($key, $value, 60 * 60 * 12);
	}
	}