Form processing example from lecture

form.html

<% if (typeof message !== "undefined") { %>
    <%= message %>
<% } %>
<form method="POST">
    State:
    <input type=text name="state"
           value="<%= state %>" size=2 maxlength=2>
    <input type="submit">
</form>

form.js

#!/usr/bin/env node

var http = require("http"),
    fs = require("fs"),
    querystring = require("querystring"),
    _ = require("underscore");

function parseCookies(header) {
    var cookies = {
        state: "CA",
        message: undefined
    };
    
    if (header) {
        _.each(header.split("; "), function(cookie) {
            var q = querystring.parse(cookie);
    
            _.each(q, function(key, value) {
                cookies[value] = key;
            });
        });
    }

    return cookies;
}

http.createServer(function(req, res) {
    console.log(req.method, req.url);

    if (req.url === "/favicon.ico") {
        res.writeHead(404);
        res.end();
        return;
    }

    if (req.method === "POST") {
        var payload = "";

        req.on("data", function(chunk) {
            payload += chunk;
        });
        
        req.on("end", function() {
            var q = querystring.parse(payload);
            res.writeHead(302, {
                "Location": "/",
                "Set-Cookie": [
                    "state=" + q.state,
                    "message=Thanks"
                ]
            });
            res.end();
        });
        
    } else {
        res.writeHead(200, {
            "Content-Type": "text/html"
        });
        
        fs.readFile("form.html", function(err, content) {
            if (err) throw err;
            
            var header = req.headers.cookie,
                cookies = parseCookies(header),
                str = content.toString(),
                template = _.template(str),
                html = template(cookies);
                
            console.log(cookies);

            res.write(html);
            res.end();
        });
    }

}).listen(8080);