server.js: use strict

server.js

@@ -1,47 +1,56 @@
 #! /usr/bin/env node
 // Quick-and-dirty web server using Node.js
 // Republic Of Techies (RoT) group project.
-var sys = require('sys');
-var http = require('http');
-var fs = require('fs');
-var path = require('path');
-var port = 8080;
+(function() {
+    'use strict';
 
-http.createServer(function(request, response) {
-    var url = request.url;
-    if (url === '/')
-        url = '/index.html';
+    var sys = require('sys');
+    var http = require('http');
+    var fs = require('fs');
+    var path = require('path');
+    var port = 8080;
 
-    if (url === '/time') {
-        response.writeHeader(200, {
-            "Context-Type": "text/plain",
-            "Access-Control-Allow-Origin": "http://localhost"});
-        response.write(new Date().toString());
+    var respond = function(response, code, headers, data) {
+        response.writeHeader(code, headers);
+        response.write(data);
         response.end();
-    }
-
-    fs.readFile(path.join('.', url), function (err, data) {
-        if (err) {
-            if (err.code === 'ENOENT') {
-                fs.readFile('page404.html', function(err, data) {
-                    if (err)
-                        throw err;
-                    response.writeHeader(404, {
-                        "Content-Type": "text/html"});
-                    response.write(data.toString()
-                                   .replace(/:PATH:/g, url));
-                    response.end();
-                });
-            } else throw err;
-        } else {
-            // :TODO: determine content type --
-            //   by file extension?
-            //   by contents?
-            //   a combination of both?
-            response.writeHeader(200, {"Content-Type": "text/html"});
-            response.write(data);
-            response.end();
+    };
+
+    http.createServer(function(request, response) {
+        var url = request.url;
+        if (url === '/')
+            url = '/index.html';
+
+        if (url === '/time') {
+            respond(response, 200, {
+                "Context-Type": "text/plain",
+                "Access-Control-Allow-Origin": "http://localhost"},
+                    new Date().toString());
         }
-    });
-}).listen(port);
-console.log('Server listening: http://localhost:' + port + '/');
+
+        fs.readFile(path.join('.', url), function (err, data) {
+            if (err) {
+                if (err.code === 'ENOENT') {
+                    fs.readFile(
+                        'page404.html',
+                        function(err, data) {
+                            if (err)
+                                throw err;
+                            respond(response, 404, {
+                                "Content-Type": "text/html"},
+                                    data.toString()
+                                    .replace(/:PATH:/g, url));
+                        });
+                } else throw err;
+            } else {
+                // :TODO: determine content type --
+                //   by file extension?
+                //   by contents?
+                //   a combination of both?
+                respond(response, 200, {
+                    "Content-Type": "text/html"}, data);
+            }
+        });
+    }).listen(port);
+    console.log('Server listening: http://localhost:' + port + '/');
+})();