sabicalija/server.js

## server.js
const http = require("http");
const fs = require("fs");

const welcomePage = `<html>
  <head><title>My First Page</title></head>
  <body><h1>Hello from my Node.js Server!</h1></body>
</html>`;
const defaultPage = `<html>
  <head><title>My First Page</title></head>
  <body>
    <h1>This Page is not available!</h1>
    <h2>Take me <a href="/index.html">home</a>.</h2>
  </body>
</html>`;
const todoPage = `<html>
  <head><title>My First Page</title></head>
  <body>
    <form action="/todo/add" method="POST">
      <div><input type="text" name="todo" autofocus/></div>
      <div><button type="submit">Create</button></div>
    </form>
  </body>
</html>`;

/* Create a http server */
const server = http.createServer((request, response) => {
  const { url, method } = request;
  if (url === "/") {
    response.writeHead(301, { Location: "/index.html" });
    return response.end();
  } else {
    response.setHeader("Content-Type", "text/html");
    if (url === "/index.html") {
      return response.end(welcomePage);
    } else if (url === "/todo.html") {
      return response.end(todoPage);
    } else if (url === "/todo/add" && method === "POST") {
      let data = "";
      request.on("data", chunk => (data += chunk.toString()));
      request.on("end", () => {
        addTodo(data);
        response.writeHead(302, { Location: "/" });
        return response.end();
      });
      return;
    }
  }
  response.statusCode = 404;
  response.end(defaultPage);
});

/* Add a new todo note */
function addTodo(data) {
  const filename = "./todo.txt";
  const note = processUserData(data);
  fs.exists(filename, exists => {
    if (exists) updateNotes(filename, note);
    else createNotes(filename, note);
  });
}
function processUserData(data) {
  return decodeURIComponent(data)
    .replace(/(.*?)=(.*)/g, (m, key, value) => value)
    .replace(/\+/g, " ");
}
function updateNotes(filename, note) {
  fs.readFile(filename, "utf-8", (error, content) => {
    if (!error) createNotes(filename, [content, note].join("\n"));
    else console.error(`Could not read file ${filename}.`);
  });
}
function createNotes(filename, note) {
  console.log(`Creating note ${filename}:`, "\n", note);
  fs.writeFile(filename, note, error => {
    if (error) {
      console.error(`Could not create file ${filename}.`);
      console.error(error);
    }
  });
}

/* Bind server to a hostname and port */
const port = 8080;
const host = "127.0.0.1";
server.listen(port, host, () => {
  console.log(`Server running at http://${host}:${port}/`);
});
	const http = require("http");
	const fs = require("fs");

	const welcomePage = `<html>
	<head><title>My First Page</title></head>
	<body><h1>Hello from my Node.js Server!</h1></body>
	</html>`;
	const defaultPage = `<html>
	<head><title>My First Page</title></head>
	<body>
	<h1>This Page is not available!</h1>
	<h2>Take me <a href="/index.html">home</a>.</h2>
	</body>
	</html>`;
	const todoPage = `<html>
	<head><title>My First Page</title></head>
	<body>
	<form action="/todo/add" method="POST">
	<div><input type="text" name="todo" autofocus/></div>
	<div><button type="submit">Create</button></div>
	</form>
	</body>
	</html>`;

	/* Create a http server */
	const server = http.createServer((request, response) => {
	const { url, method } = request;
	if (url === "/") {
	response.writeHead(301, { Location: "/index.html" });
	return response.end();
	} else {
	response.setHeader("Content-Type", "text/html");
	if (url === "/index.html") {
	return response.end(welcomePage);
	} else if (url === "/todo.html") {
	return response.end(todoPage);
	} else if (url === "/todo/add" && method === "POST") {
	let data = "";
	request.on("data", chunk => (data += chunk.toString()));
	request.on("end", () => {
	addTodo(data);
	response.writeHead(302, { Location: "/" });
	return response.end();
	});
	return;
	}
	}
	response.statusCode = 404;
	response.end(defaultPage);
	});

	/* Add a new todo note */
	function addTodo(data) {
	const filename = "./todo.txt";
	const note = processUserData(data);
	fs.exists(filename, exists => {
	if (exists) updateNotes(filename, note);
	else createNotes(filename, note);
	});
	}
	function processUserData(data) {
	return decodeURIComponent(data)
	.replace(/(.?)=(.)/g, (m, key, value) => value)
	.replace(/\+/g, " ");
	}
	function updateNotes(filename, note) {
	fs.readFile(filename, "utf-8", (error, content) => {
	if (!error) createNotes(filename, [content, note].join("\n"));
	else console.error(`Could not read file ${filename}.`);
	});
	}
	function createNotes(filename, note) {
	console.log(`Creating note ${filename}:`, "\n", note);
	fs.writeFile(filename, note, error => {
	if (error) {
	console.error(`Could not create file ${filename}.`);
	console.error(error);
	}
	});
	}

	/* Bind server to a hostname and port */
	const port = 8080;
	const host = "127.0.0.1";
	server.listen(port, host, () => {
	console.log(`Server running at http://${host}:${port}/`);
	});