Adding tutorial files

ltseng · Jan 24, 2013 · c972809 · c972809
1 parent e666db4
commit c972809
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diff --git a/Beginner.js b/Beginner.js
@@ -0,0 +1 @@
+console.log("Hello World")
diff --git a/index.js b/index.js
@@ -0,0 +1,11 @@
+var server = require("./server");
+var router = require("./router");
+var requestHandlers = require("./requestHandlers");
+
+var handle = {}
+handle["/"] = requestHandlers.start;
+handle["/start"] = requestHandlers.start;
+handle["/upload"] = requestHandlers.upload;
+handle["/show"] = requestHandlers.show;
+
+server.start(router.route, handle);
diff --git a/requestHandlers.js b/requestHandlers.js
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+var exec = require("child_process").exec;
+ 	querystring = require("querystring");
+	fs = require("fs");
+	formidable = require("formidable");
+
+function start(response, postData) {
+  console.log("Request handler 'start' was called.");
+
+  var body = '<html>'+
+    '<head>'+
+    '<meta http-equiv="Content-Type" '+
+    'content="text/html; charset=UTF-8" />'+
+    '</head>'+
+    '<body>'+
+    '<form action="/upload" enctype="multipart/form-data" '+
+    'method="post">'+
+    '<input type="file" name="upload">'+
+    '<input type="submit" value="Upload file" />'+
+    '</form>'+
+    '</body>'+
+    '</html>';
+
+
+    response.writeHead(200, {"Content-Type": "text/html"});
+    response.write(body);
+    response.end();
+}
+
+function upload(response, request) {
+  console.log("Request handler 'upload' was called.");
+
+  var form = new formidable.IncomingForm();
+  console.log("about to parse");
+  form.parse(request, function(error, fields, files) {
+    console.log("parsing done");
+
+    /* Possible error on Windows systems:
+       tried to rename to an already existing file */
+    fs.rename(files.upload.path, "/tmp/test.png", function(err) {
+      if (err) {
+        fs.unlink("/tmp/test.png");
+        fs.rename(files.upload.path, "/tmp/test.png");
+      }
+    });
+    response.writeHead(200, {"Content-Type": "text/html"});
+    response.write("received image:<br/>");
+    response.write("<img src='/show' />");
+    response.end();
+  });
+}
+
+function show(response) {
+  console.log("Request handler 'show' was called.");
+  fs.readFile("/tmp/test.png", "binary", function(error, file) {
+    if(error) {
+      response.writeHead(500, {"Content-Type": "text/plain"});
+      response.write(error + "\n");
+      response.end();
+    } else {
+      response.writeHead(200, {"Content-Type": "image/png"});
+      response.write(file, "binary");
+      response.end();
+    }
+  });
+}
+
+
+exports.start = start;
+exports.upload = upload;
+exports.show = show;
diff --git a/router.js b/router.js
@@ -0,0 +1,13 @@
+function route(handle, pathname,response, request){
+	console.log("About to route a request for " + pathname);
+	if (typeof handle[pathname] === 'function'){
+		handle[pathname](response, request);
+	} else{
+		console.log("No request handler found for " + pathname);
+		response.writeHead(404, {"Content-Type": "text/plain"});
+		response.write("404 Not Found");
+		response.end();
+	}
+}
+
+exports.route = route;
diff --git a/server.js b/server.js
@@ -0,0 +1,15 @@
+var http = require("http");
+var url = require("url");
+
+function start(route, handle) {
+  function onRequest(request, response) {
+    var pathname = url.parse(request.url).pathname;
+    console.log("Request for " + pathname + " received.");
+	route(handle, pathname, response, request);
+  }
+
+  http.createServer(onRequest).listen(8888);
+  console.log("Server has started.");
+}
+
+exports.start = start;