allow downloading board backups

server-data/board-test.json.2019-06-25T11:52:32.336Z.bak

@@ -0,0 +1 @@
+!{"tjp1lbrm74":{"type":"new","id":"tjp1lbrm74","color":"#1913b0","size":27,"x":552,"y":251,"tool":"Text","txt":""},"tjp1lbszvk":{"type":"new","id":"tjp1lbszvk","color":"#1913b0","size":27,"x":957,"y":385,"tool":"Text","txt":""},"tjp1lc73bo":{"type":"new","id":"tjp1lc73bo","color":"#1913b0","size":27,"x":962,"y":370,"tool":"Text","txt":""},"sjp1ly7ztg":{"type":"straight","id":"sjp1ly7ztg","color":"#1913b0","size":10,"x":498,"y":547,"tool":"Straight line","x2":652,"y2":698},"sjp1lybvdw":{"type":"straight","id":"sjp1lybvdw","color":"#1913b0","size":39,"x":407,"y":177,"tool":"Straight line","x2":407,"y2":177},"ljp2gfjkp8":{"type":"line","id":"ljp2gfjkp8","color":"#1913b0","size":10,"tool":"Pencil","_children":[{"type":"child","parent":"ljp2gfjkp8","x":502,"y":430,"tool":"Pencil"},{"type":"child","parent":"ljp2gfjkp8","x":513,"y":433,"tool":"Pencil"},{"type":"child","parent":"ljp2gfjkp8","x":585,"y":434,"tool":"Pencil"},{"type":"child","parent":"ljp2gfjkp8","x":738,"y":405,"tool":"Pencil"},{"type":"child","parent":"ljp2gfjkp8","x":845,"y":398,"tool":"Pencil"},{"type":"child","parent":"ljp2gfjkp8","x":868,"y":399,"tool":"Pencil"}]},"ljp2gfknc8":{"type":"line","id":"ljp2gfknc8","color":"#1913b0","size":10,"tool":"Pencil","_children":[{"type":"child","parent":"ljp2gfknc8","x":655,"y":281,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":675,"y":283,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":825,"y":248,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":999,"y":251,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1037,"y":272,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1089,"y":292,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1113,"y":311,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1130,"y":325,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1143,"y":333,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1160,"y":350,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1174,"y":388,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1169,"y":429,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1151,"y":460,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1136,"y":480,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1131,"y":485,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1127,"y":485,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1120,"y":445,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1108,"y":398,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1107,"y":401,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1098,"y":462,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1097,"y":478,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1094,"y":448,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1092,"y":445,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1084,"y":472,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1084,"y":470,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1082,"y":446,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1077,"y":460,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1075,"y":467,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1068,"y":448,"tool":"Pencil"},{"type":"child","parent":"ljp2gfknc8","x":1060,"y":460,"tool":"Pencil"}]},"sjp2gg3jeu":{"type":"straight","id":"sjp2gg3jeu","color":"#1913b0","size":10,"x":777,"y":743,"tool":"Straight line","x2":1343,"y2":638},"sjp2gg4rts":{"type":"straight","id":"sjp2gg4rts","color":"#1913b0","size":10,"x":1340,"y":649,"tool":"Straight line","x2":1055,"y2":916},"sjp2gg69zj":{"type":"straight","id":"sjp2gg69zj","color":"#1913b0","size":10,"x":929,"y":630,"tool":"Straight line","x2":1422,"y2":1139},"rjp2gg8dyo":{"type":"rect","id":"rjp2gg8dyo","color":"#1913b0","size":10,"x":1060,"y":61,"x2":1394,"y2":245,"tool":"Rectangle"}}

server/server.js

@@ -130,6 +130,10 @@ function handleRequest(request, response) {
 				"Content-Type": "application/json",
 				"Content-Disposition": 'attachment; filename="' + boardName + '.wbo"'
 			};
+		if (parts[2]) {
+			history_file += '.' + parts[2] + '.bak';
+		}
+		log("Downloading " + history_file);
 		var promise = fileserver.serveFile(history_file, 200, headers, request, response);
 		promise.on("error", function (err) {
 			console.error("Error while downloading history", err);