Instantiate a Jetpack_Tracks_Event object instead
	 * @param  array $event Event keys and values.
	 * @return mixed        Validated keys and values or WP_Error on failure
	 */
	private static function validate_and_sanitize( $event ) {
		$_event = new Jetpack_Tracks_Event( $event );
		if ( is_wp_error( $_event ) ) {
			return $_event;
		}
		return get_object_vars( $_event );
	}

	/**
	 * Builds a timestamp.
	 *
	 * Milliseconds since 1970-01-01.
	 *
	 * @return string
	 */
	public static function build_timestamp() {
		$ts = round( microtime( true ) * 1000 );
		return number_format( $ts, 0, '', '' );
	}

	/**
	 * Grabs the user's anon id from cookies, or generates and sets a new one
	 *
	 * @return string An anon id for the user
	 */
	public static function get_anon_id() {
		static $anon_id = null;

		if ( ! isset( $anon_id ) ) {

			// Did the browser send us a cookie?
			if ( isset( $_COOKIE['tk_ai'] ) && preg_match( '#^[a-z]+:[A-Za-z0-9+/=]{24}$#', $_COOKIE['tk_ai'] ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput -- This is validating.
				$anon_id = $_COOKIE['tk_ai']; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput -- This is validating.
			} else {

				$binary = '';

				// Generate a new anonId and try to save it in the browser's cookies.
				// Note that base64-encoding an 18 character string generates a 24-character anon id.
				for ( $i = 0; $i < 18; ++$i ) {
					$binary .= chr( wp_rand( 0, 255 ) );
				}

				$anon_id = 'jetpack:' . base64_encode( $binary ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode

				if ( ! headers_sent()
					&& ! ( defined( 'REST_REQUEST' ) && REST_REQUEST )
					&& ! ( defined( 'XMLRPC_REQUEST' ) && XMLRPC_REQUEST )
				) {
					setcookie( 'tk_ai', $anon_id, 0, COOKIEPATH, COOKIE_DOMAIN, is_ssl(), false ); // phpcs:ignore Jetpack.Functions.SetCookie -- This is a random value and should be fine.
				}
			}
		}

		return $anon_id;
	}

	/**
	 * Gets the WordPress.com user's Tracks identity, if connected.
	 *
	 * @return array|bool
	 */
	public static function get_connected_user_tracks_identity() {
		$user_data = ( new Manager() )->get_connected_user_data();
		if ( ! $user_data ) {
			return false;
		}

		return array(
			'blogid'      => Jetpack_Options::get_option( 'id', 0 ),
			'email'       => $user_data['email'],
			'userid'      => $user_data['ID'],
			'username'    => $user_data['login'],
			'user_locale' => $user_data['user_locale'],
		);
	}
}