Red.CookieSessions 1.2.1

Cookie Sessions for RedHttpServer

Simple session management middleware for Red.

Usage

After installing and referencing this library, the Red.Request has the extension methods OpenSession(sessionData) and GetSession().

OpenSession(sessionData) will open a new session and add a header to the response associated with the request.

GetSession<TSession>() will return the CookieSession object wrapping the TSession-data, which has two methods: Renew() and Close(), and the field Data, which holds the session-data object

Example

class MySession 
{
    public string Username;
}
...

server.Use(new CookieSessions<MySession>(new CookieSessionSettings(TimeSpan.FromDays(1))
{   // We allow unauthenticated users to send requests to /login, so we can authenticate them
    ShouldAuthenticate = path => path != "/login" // We allow people to send requests without a valid Authorization to /login, where we can authenticate them
}));
server.Post("/login", async (req, res) =>
{
    var form = await res.GetFormDataAsync();
    if (ValidForm(form) && Authenticate(form["username"], form["password"]))
    {
        req.OpenSession(new MySession {Username = form["username"]}); // Here we just have the username as session-data
        await res.SendStatus(HttpStatusCode.OK);
    }
    else 
        await res.SendStatus(HttpStatusCode.BadRequest);
});
// Only authenticated users are allowed to /friends
server.Get("/friends", async (req, res) => 
{
    var session = req.GetSession<MySession>();
    var friends = database.GetFriendsOfUser(session.Username);
    await res.SendJson(friends);
});
server.Post("/logout", async (req, res) => 
{
    req.GetSession<MySession>().Close();
    await res.SendStatus(HttpStatusCode.OK);
});

Implementation

OpenSession will open a new session and attach a Set-Cookie header to the associated response. This header's value contains the token used for authentication. The token is generated using the RandomNumberGenerator from System.Security.Cryptography, so it shouldn't be too easy to "guess" other tokens, even with knowledge of some tokens.