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<?php
namespace RebelCode\Wpra\Core\Handlers\CustomFeed;
use RebelCode\Wpra\Core\Data\DataSetInterface;
/**
* The handler that registers the WPRA custom feed with WordPress.
*
* @since 4.13
*/
class RegisterCustomFeedHandler
{
/**
* The WPRA general settings dataset.
*
* @since 4.13
*
* @var DataSetInterface
*/
protected $settings;
/**
* The default custom feed URL if no URL is saved in the settings.
*
* @since 4.13
*
* @var string
*/
protected $defaultUrl;
/**
* The callback to render the custom feed.
*
* @since 4.13
*
* @var callable
*/
protected $renderCallback;
/**
* Constructor.
*
* @since 4.13
*
* @param DataSetInterface $settings The WPRA general settings dataset.
* @param string $defaultUrl The default custom feed URL if no URL is saved in the settings.
* @param callable $renderCallback The callback to render the custom feed.
*/
public function __construct(DataSetInterface $settings, $defaultUrl, callable $renderCallback)
{
$this->settings = $settings;
$this->defaultUrl = $defaultUrl;
$this->renderCallback = $renderCallback;
}
/**
* {@inheritdoc}
*
* @since 4.13
*/
public function __invoke()
{
// Get the custom feed URL
$customFeedUrl = $this->getCustomFeedUrl();
// Register the feed with WordPress
add_feed($customFeedUrl, $this->renderCallback);
// If the custom feed rewrite rule does not exist, flush the rewrite rules
if (!$this->rewriteRuleExists($customFeedUrl)) {
flush_rewrite_rules();
}
}
/**
* Retrieves the custom feed URL.
*
* @since 4.13
*
* @return string
*/
protected function getCustomFeedUrl()
{
return (isset($this->settings['custom_feed_url']) && !empty($this->settings['custom_feed_url']))
? $this->settings['custom_feed_url']
: $this->defaultUrl;
}
/**
* Checks if the custom feed URL exists in the WordPress rewrite rules.
*
* @since 4.13
*
* @param string $customFeedUrl The custom feed URL.
*
* @return bool True if the rewrite rule exists, false if not.
*/
protected function rewriteRuleExists($customFeedUrl)
{
// Get all registered rewrite rules
$rules = get_option('rewrite_rules');
// If there are existing rules
if (is_array($rules)) {
foreach ($rules as $key => $value) {
if (strpos($key, $customFeedUrl) !== false && preg_match('/[?&]feed=\$matches\[\d]/', $value)) {
return true;
}
}
}
return false;
}
}