SpecialRecordImpression.php
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SpecialRecordImpression.php
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	<?php

	use MediaWiki\SpecialPage\UnlistedSpecialPage;

	/**
	* Null endpoint. This is a workaround to simplify analytics.
	*/
	class SpecialRecordImpression extends UnlistedSpecialPage {
	// Cache this blank response for a day or so (60 * 60 * 24 s.)
	public const CACHE_EXPIRY = 86400;

	public function __construct() {
	// Register special page
	parent::__construct( "RecordImpression" );
	}

	public function execute( $par ) {
	$this->getOutput()->disable();

	$this->sendHeaders();

	// Output nothing else.
	}

	/**
	* Generate the HTTP response headers for the banner file
	*/
	private function sendHeaders() {
	$expiry = static::CACHE_EXPIRY;
	header( "Content-Type: image/png" );

	// If we have a logged in user; do not cache (default for special pages)
	// lest we capture a set-cookie header. Otherwise cache so we don't have
	// too big of a DDoS hole.
	if ( !$this->getUser()->isRegistered() ) {
	header( "Cache-Control: public, s-maxage={$expiry}, max-age=0" );
	}
	}
	}