[WooCommerce] x-sendfile with php-fpm

A while ago I started thread here:
https://wordpress.org/support/topic/x-sendfile-with-php-fpm/

It’s now closed but in case anyone has the same issue, here is the solution, pretty much along the lines suggested by support.

Below is a code snippet which I added into the customisations plugin, or you could add it to a child theme’s functions.php.

The problem arises with WooCommerce file downloads if you are running apache and php FPM. WooCommerce can’t detect X-Sendfile because FPM doesn’t have the required function.
So the following code copies the WC code with the X-Sendfile check removed.

/* force X-Sendfile despite php-fpm */
remove_action( 'woocommerce_download_file_xsendfile', array( WC_Download_Handler::class, 'download_file_xsendfile' ) );

// Hook your custom function into WooCommerce's download handler
add_action('woocommerce_download_file_xsendfile', [ spelfabet_download_handler::class, 'download_file_xsendfile'], 10, 2);

class spelfabet_download_handler{
	
public static function download_file_xsendfile( $file_path, $filename ) {
		$parsed_file_path = WC_Download_Handler::parse_file_path( $file_path );
		
		self::download_headers( $parsed_file_path['file_path'], $filename );
		$filepath = apply_filters( 'woocommerce_download_file_xsendfile_file_path', $parsed_file_path['file_path'], $file_path, $filename, $parsed_file_path );
		header( 'X-Sendfile: ' . $filepath );
		exit;
	}
private static function download_headers( $file_path, $filename, $download_range = array() ) {
		self::check_server_config();
		self::clean_buffers();
		wc_nocache_headers();

		header( 'X-Robots-Tag: noindex, nofollow', true );
		header( 'Content-Type: ' . self::get_download_content_type( $file_path ) );
		header( 'Content-Description: File Transfer' );
		header( 'Content-Disposition: ' . self::get_content_disposition() . '; filename="' . $filename . '";' );
		header( 'Content-Transfer-Encoding: binary' );

		$file_size = @filesize( $file_path ); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged
		if ( ! $file_size ) {
			return;
		}

		if ( isset( $download_range['is_range_request'] ) && true === $download_range['is_range_request'] ) {
			if ( false === $download_range['is_range_valid'] ) {
				header( 'HTTP/1.1 416 Requested Range Not Satisfiable' );
			
				header( 'Content-Range: bytes 0-' . ( $file_size - 1 ) . '/' . $file_size );
				exit;
			}

			$start  = $download_range['start'];
			$end    = $download_range['start'] + $download_range['length'] - 1;
			$length = $download_range['length'];

			header( 'HTTP/1.1 206 Partial Content' );
			header( "Accept-Ranges: 0-$file_size" );
			header( "Content-Range: bytes $start-$end/$file_size" );
			header( "Content-Length: $length" );
		} else {
			header( 'Content-Length: ' . $file_size );
		}
	}
private static function check_server_config() {
		wc_set_time_limit( 0 );
		if ( function_exists( 'apache_setenv' ) ) {
			@apache_setenv( 'no-gzip', 1 ); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged, WordPress.PHP.DiscouragedPHPFunctions.runtime_configuration_apache_setenv
		}
		@ini_set( 'zlib.output_compression', 'Off' ); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged, WordPress.PHP.DiscouragedPHPFunctions.runtime_configuration_ini_set
		@session_write_close(); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged, WordPress.VIP.SessionFunctionsUsage.session_session_write_close
	}
private static function clean_buffers() {
		if ( ob_get_level() ) {
			$levels = ob_get_level();
			for ( $i = 0; $i < $levels; $i++ ) {
				@ob_end_clean(); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged
			}
		} else {
			@ob_end_clean(); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged
		}
	}
private static function get_download_content_type( $file_path ) {
		$file_extension = strtolower( substr( strrchr( $file_path, '.' ), 1 ) );
		$ctype          = 'application/force-download';

		foreach ( get_allowed_mime_types() as $mime => $type ) {
			$mimes = explode( '|', $mime );
			if ( in_array( $file_extension, $mimes, true ) ) {
				$ctype = $type;
				break;
			}
		}

		return $ctype;
	}
private static function get_content_disposition() : string {
		$disposition = 'attachment';
		if ( 'yes' === get_option( 'woocommerce_downloads_deliver_inline' ) ) {
			$disposition = 'inline';
		}
		return $disposition;
	}
}

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