<?php
/**
 * No-op request signer.
 *
 * @package AdPix\Analytics
 */

declare( strict_types = 1 );

namespace AdPix\Analytics\Http;

use AdPix\Analytics\Contracts\SignerInterface;

defined( 'ABSPATH' ) || exit;

/**
 * Leaves the headers alone.
 *
 * Used when the property does not require HMAC. It matters that this adds no signature header at
 * all rather than an empty one: the collector verifies any signature it is given, so an empty
 * X-Sov-Signature would turn an unsigned request into a failed one.
 */
final class NullSigner implements SignerInterface {

	/**
	 * Return the headers unchanged.
	 *
	 * @param array<string,string> $headers Headers assembled so far.
	 * @param string               $body    Request body.
	 * @return array<string,string>
	 */
	public function sign( array $headers, string $body ): array {
		unset( $body );
		return $headers;
	}
}