add a preview endpoint

server/createSVG.js

@@ -1,8 +1,6 @@
 var fs = require("fs"),
 	path = require("path");
 
-var HISTORY_FILE = process.argv[2] || path.join(__dirname, "../server-data/history.txt");
-
 function htmlspecialchars (str) {
 	//Hum, hum... Could do better
 	if (typeof str !== "string") return "";
@@ -70,14 +68,27 @@ function toSVG(obj) {
 				']]></style></defs>' +
 				elements +
 				'</svg>';
-	console.log(svg);
 	return svg;
 }
 
-fs.readFile(HISTORY_FILE, function (err, data) {
-	if (err) throw err;
+function renderBoard(file, callback) {
 	var t=Date.now();
-	var board = JSON.parse(data);
-	console.error("JSON parsed in "+(Date.now()-t)+"ms.");
-	toSVG(board);
-});
+	fs.readFile(file, function (err, data) {
+		if (err) return callback(err);
+		var board = JSON.parse(data);
+		console.warn("JSON parsed in "+(Date.now()-t)+"ms.");
+		var svg = toSVG(board);
+		console.warn("Board rendered in "+(Date.now()-t)+"ms.");
+		callback(null, svg);
+	});
+}
+
+if (require.main === module) {
+	var HISTORY_FILE = process.argv[2] || path.join(__dirname, "../server-data/board-anonymous.json");
+
+	renderBoard(HISTORY_FILE, function(err, rendered) {
+		console.log(rendered);
+	});
+} else {
+	module.exports = { 'renderBoard': renderBoard };
+}

server/server.js

@@ -2,7 +2,8 @@ var app = require('http').createServer(handler)
   , sockets = require('./sockets.js')
   , fs = require('fs')
   , path = require('path')
-  , nodestatic = require("node-static");
+  , nodestatic = require("node-static")
+  , createSVG = require("./createSVG.js");
 
 
 var io = sockets.start(app);
@@ -73,6 +74,17 @@ function handler (request, response) {
 			response.statusCode = 404;
 			response.end("ERROR: Unable to serve history file\n");
 		});
+	} else if (parts[0] === "preview") {
+		var boardName = encodeURIComponent(parts[1]),
+			history_file = path.join(__dirname, "..", "server-data", "board-" + boardName + ".json");
+		createSVG.renderBoard(history_file, function(err, svg) {
+			if (err) {
+				response.writeHead(404, {'Content-Type': 'application/json'});
+				response.end(JSON.stringify(err));
+			}
+			response.writeHead(200, {"Content-Type": "image/svg+xml"});
+			response.end(svg);
+		});
 	} else {
 		fileserver.serve(request, response, function (err, res){
 			if (err) serveError(request, response, err);