Account.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.IO;
using System.Security;
using System.Text.RegularExpressions;

namespace Jerl.GelbooruActionablesLibrary
{
    /// <summary>
    /// This class enables the user to log in to the site.
    /// </summary>
    public static class Account
    {

        //provide access to the cookies generated
        private static CookieContainer cookieContainer;

        //backing field
        private static Uri loginUri = new Uri("http://gelbooru.com/index.php?page=account&s=login&code=00");

        /// <summary>
        /// provides external visibility to the login URI should it be needed
        /// </summary>
        public static Uri LoginUri
        {
            get { return loginUri; }
        }

        /// <summary>
        /// Logs the user in to the site using the console.
        /// </summary>
        /// <returns>A CookieContainer with the user's login credentials</returns>
        public static CookieContainer LoginUi()
        {
            bool loginSuccess = false;
            do
            {

                //prompt the user for login information
                Console.WriteLine("Input username");
                string username;
                do
                    username = Console.ReadLine();
                while (username == "");

                Console.WriteLine("Input password");
                string password;
                do
                    password = GetPassword();
                while (password == "");

                //clear the console once we have what we need
                Console.Clear();

                Login(username, password, out loginSuccess);

                if (!loginSuccess)
                    Console.WriteLine("Login failed!");
            } while (!loginSuccess);

            return cookieContainer;
        }

        /// <summary>
        ///  Logs in to the site using the provided credentials and verifies that the login succeeded.
        /// </summary>
        /// <param name="username">The username to log in with.</param>
        /// <param name="password">The password to log in with.</param>
        /// <param name="loginSuccess">A boolean that will be set to true if login succeeds or false if login fails.</param>
        /// <returns>A CookieContainer containing successful login credentials.</returns>
        public static CookieContainer Login(string username, string password, out bool loginSuccess)
        {
            //create a byte array out of our request
            byte[] post = new ASCIIEncoding().GetBytes(string.Format("user={0}&pass={1}&submit=Log+in", username, password));

            //create the login request
            HttpWebRequest loginRequest = (HttpWebRequest)WebRequest.Create(LoginUri);
            loginRequest.Proxy = null;
            loginRequest.Method = "POST";
            loginRequest.AllowAutoRedirect = false;
            loginRequest.ContentType = "application/x-www-form-urlencoded";
            loginRequest.ContentLength = post.Length;

            //post the data
            Stream postStream = loginRequest.GetRequestStream();
            postStream.Write(post, 0, post.Length);
            postStream.Close();

            //create the cookie container
            loginRequest.CookieContainer = new CookieContainer();

            loginRequest.Referer = "http://gelbooru.com/index.php?page=account&s=login&code=00";

            //load the page
            try
            {
                HttpWebResponse loginResponse = (HttpWebResponse)loginRequest.GetResponse();
                Stream dumpData = loginResponse.GetResponseStream();
                Regex loginCheckRegex = new Regex("s=home");
                using (StreamReader dumpDataReader = new StreamReader(dumpData))
                {
                    //string page = dumpDataReader.ReadToEnd();
                    //loginSuccess = loginCheckRegex.IsMatch(page);
                    dumpDataReader.ReadToEnd();

                }
                loginSuccess = (loginResponse.Headers["Location"] == "index.php?page=account&s=home");

                //update our field with the cookies we acquired
                cookieContainer = loginRequest.CookieContainer;
            }
            catch (WebException)
            {
                loginSuccess = false;
            }
            return cookieContainer;
        }

        /// <summary>
        /// Fetches the user's password from the console
        /// </summary>
        /// <returns>The user's password</returns>
        public static string GetPassword()
        {
            string pwd = "";
            while (true)
            {
                ConsoleKeyInfo i = Console.ReadKey(true);
                if (i.Key == ConsoleKey.Enter)
                {
                    break;
                }
                else if (i.Key == ConsoleKey.Backspace)
                {
                    if (pwd.Length > 0)
                    {
                        pwd.Remove(pwd.Length - 1);
                        Console.Write("\b \b");
                    }
                }
                else
                {
                    pwd = pwd.Insert(pwd.Length, i.KeyChar.ToString());
                    Console.Write("*");
                }
            }
            return pwd;
        }

        /// <summary>
        /// Verifies that a CookieContainer contains valid login credentials.
        /// </summary>
        /// <param name="cookies">A CookieContainer to check for valid Gelbooru login credentials.</param>
        /// <returns>true if the credentials are valid, false if they are not.</returns>
        public static bool LoginVerified(CookieContainer cookies)
        {

            Regex loggedInRegex = new Regex("index.php?page=account&s=profile");

            HttpWebRequest loginVerificationRequest = (HttpWebRequest)WebRequest.Create("http://gelbooru.com/index.php?page=account&s=home");
            loginVerificationRequest.CookieContainer = cookies;

            try
            {
                HttpWebResponse loginVerificationResponse = (HttpWebResponse)loginVerificationRequest.GetResponse();

                string page;
                using (StreamReader sr = new StreamReader(loginVerificationResponse.GetResponseStream()))
                {
                    page = sr.ReadToEnd();
                }

                if (Regex.IsMatch(page, "Logout"))
                    return true;
                return false;
            }
            catch (WebException)
            {
                return false;
            }
        }

    }
}