Easy OAuth form for Microsoft Account authentication

FormMicrosoftAccountAuth.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace OneDriveSamples
{
    public partial class FormMicrosoftAccountAuth : Form
    {
        public const string OAuthDesktopEndPoint = "https://login.live.com/oauth20_desktop.srf";

        #region Properties
        public string StartUrl { get; private set; }
        public string EndUrl { get; private set; }
        public AuthResult AuthResult { get; private set; }
        public OAuthFlow AuthFlow { get; private set; }
        
        #endregion

        #region Constructor
        public FormMicrosoftAccountAuth(string startUrl, string endUrl, OAuthFlow flow = OAuthFlow.AuthorizationCodeGrant)
        {
            InitializeComponent();

            this.StartUrl = startUrl;
            this.EndUrl = endUrl;
            this.FormClosing += FormMicrosoftAccountAuth_FormClosing;
        }
        #endregion

        #region Private Methods
        private void FormMicrosoftAccountAuth_FormClosing(object sender, FormClosingEventArgs e)
        {
        }

        private void FormMicrosoftAccountAuth_Load(object sender, EventArgs e)
        {
            this.webBrowser.CanGoBackChanged += webBrowser_CanGoBackChanged;
            this.webBrowser.CanGoForwardChanged += webBrowser_CanGoBackChanged;
            FixUpNavigationButtons();

            this.webBrowser.Navigated += webBrowser_Navigated;

            System.Diagnostics.Debug.WriteLine("Navigating to start URL: " + this.StartUrl);
            this.webBrowser.Navigate(this.StartUrl);
        }

        void webBrowser_CanGoBackChanged(object sender, EventArgs e)
        {
            FixUpNavigationButtons();
        }

        private void webBrowser_Navigated(object sender, WebBrowserNavigatedEventArgs e)
        {
            System.Diagnostics.Debug.WriteLine("Navigated to: " + webBrowser.Url.AbsoluteUri.ToString());

            this.Text = webBrowser.DocumentTitle;

            if (this.webBrowser.Url.AbsoluteUri.StartsWith(EndUrl))
            {
                this.AuthResult = new AuthResult(this.webBrowser.Url, this.AuthFlow);
                CloseWindow();
            }
        }

        private void CloseWindow()
        {
            const int interval = 100;
            var t = new System.Threading.Timer(new System.Threading.TimerCallback((state) => 
            {
                this.DialogResult = System.Windows.Forms.DialogResult.OK;
                this.BeginInvoke(new MethodInvoker(() => this.Close()));
            }), null, interval, System.Threading.Timeout.Infinite);
        }

        private void FixUpNavigationButtons()
        {
            toolStripBackButton.Enabled = webBrowser.CanGoBack;
            toolStripForwardButton.Enabled = webBrowser.CanGoForward;
        }
        #endregion


        public Task<DialogResult> ShowDialogAsync(IWin32Window owner = null)
        {
            TaskCompletionSource<DialogResult> tcs = new TaskCompletionSource<DialogResult>();
            this.FormClosed += (s, e) =>
            {
                tcs.SetResult(this.DialogResult);
            };
            if (owner == null)
                this.Show();
            else
                this.Show(owner);

            return tcs.Task;
        }

        #region Static Methods

        private static string GenerateScopeString(string[] scopes)
        {
            StringBuilder sb = new StringBuilder();
            foreach(var scope in scopes)
            {
                if (sb.Length > 0)
                    sb.Append(" ");
                sb.Append(scope);
            }
            return sb.ToString();
        }

        private static string BuildUriWithParameters(string baseUri, Dictionary<string, string> queryStringParameters)
        {
            var sb = new StringBuilder();
            sb.Append(baseUri);
            sb.Append("?");
            foreach (var param in queryStringParameters)
            {
                if (sb[sb.Length - 1] != '?')
                    sb.Append("&");
                sb.Append(param.Key);
                sb.Append("=");
                sb.Append(Uri.EscapeDataString(param.Value));
            }
            return sb.ToString();
        }


        public static async Task<string> GetAuthenticationToken(string clientId, string[] scopes, OAuthFlow flow, IWin32Window owner = null)
        {
            const string msaAuthUrl = "https://login.live.com/oauth20_authorize.srf";
            const string msaDesktopUrl = "https://login.live.com/oauth20_desktop.srf";
            string startUrl, completeUrl;
            
            Dictionary<string, string> urlParam = new Dictionary<string,string>();
            urlParam.Add("client_id", clientId);
            urlParam.Add("scope", GenerateScopeString(scopes));
            urlParam.Add("redirect_uri", msaDesktopUrl);

            switch (flow)
            {
                case OAuthFlow.ImplicitGrant:
                    urlParam.Add("response_type", "token");
                    break;
                case OAuthFlow.AuthorizationCodeGrant:
                    urlParam.Add("response_type", "code");
                    break;
                default:
                    throw new NotSupportedException("flow value not supported");
            }

            startUrl = BuildUriWithParameters(msaAuthUrl, urlParam);
            completeUrl = msaDesktopUrl;

            FormMicrosoftAccountAuth authForm = new FormMicrosoftAccountAuth(startUrl, completeUrl, flow);
            DialogResult result = await authForm.ShowDialogAsync(owner);
            if (DialogResult.OK == result)
            {
                return OnAuthComplete(authForm.AuthResult);
            }
            return null;
        }

        private static string OnAuthComplete(OneDriveSamples.AuthResult authResult)
        {
            switch (authResult.AuthFlow)
            {
                case OAuthFlow.ImplicitGrant:
                    return authResult.AccessToken;
                case OAuthFlow.AuthorizationCodeGrant:
                    return authResult.AuthorizeCode;
                default:
                    throw new ArgumentOutOfRangeException("Unsupported AuthFlow value");
            }
        }

        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            webBrowser.GoBack();
        }

        private void toolStripButton2_Click(object sender, EventArgs e)
        {
            webBrowser.GoForward();
        }
        #endregion

        public static async Task<string> GetUserId(string authToken)
        {
            if (string.IsNullOrEmpty(authToken)) throw new ArgumentNullException("authToken");

            string requestUrl = "https://apis.live.net/v5.0/me?access_token=" + System.Uri.EscapeUriString(authToken);
            HttpWebRequest request = HttpWebRequest.CreateHttp(requestUrl);

            WebResponse wr = await request.GetResponseAsync();
            HttpWebResponse response = wr as HttpWebResponse;
            if (null == response) return null;

            Stream responseStream = response.GetResponseStream();
            StreamReader reader = new StreamReader(responseStream);

            var serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
            Dictionary<string, object> dict = (Dictionary<string, object>)serializer.DeserializeObject(await reader.ReadToEndAsync());

            string userId = dict["id"] as string;
            return userId;
        }
    }

    public enum OAuthFlow
    {
        ImplicitGrant,
        AuthorizationCodeGrant
    }

    public class AuthResult
    {
        public AuthResult(Uri resultUri, OAuthFlow flow)
        {
            this.AuthFlow = flow;

            string[] queryParams = null;
            switch (flow)
            {
                case OAuthFlow.ImplicitGrant:
                    int accessTokenIndex = resultUri.AbsoluteUri.IndexOf("#access_token");
                    if (accessTokenIndex > 0)
                    {
                        queryParams = resultUri.AbsoluteUri.Substring(accessTokenIndex + 1).Split('&');
                    }
                    else
                    {
                        queryParams = resultUri.Query.TrimStart('?').Split('&');
                    }
                    break;
                case OAuthFlow.AuthorizationCodeGrant:
                    queryParams = resultUri.Query.TrimStart('?').Split('&');
                    break;
                default:
                    throw new NotSupportedException("flow value not supported");
            }

            foreach (string param in queryParams)
            {
                string[] kvp = param.Split('=');
                switch (kvp[0])
                {
                    case "code":
                        this.AuthorizeCode = kvp[1];
                        break;
                    case "access_token":
                        this.AccessToken = kvp[1];
                        break;
                    case "authorization_token":
                    case "authentication_token":
                        this.AuthenticationToken = kvp[1];
                        break;
                    case "error":
                        this.ErrorCode = kvp[1];
                        break;
                    case "error_description":
                        this.ErrorDescription = Uri.UnescapeDataString(kvp[1]);
                        break;
                    case "token_type":
                        this.TokenType = kvp[1];
                        break;
                    case "expires_in":
                        this.AccessTokenExpiresIn = new TimeSpan(0, 0, int.Parse(kvp[1]));
                        break;
                    case "scope":
                        this.Scopes = kvp[1].Split(new string[] {"%20"}, StringSplitOptions.RemoveEmptyEntries);
                        break;
                    case "user_id":
                        this.UserId = kvp[1];
                        break;
                }
            }
        }

        public OAuthFlow AuthFlow { get; private set; }
        public string AuthorizeCode { get; private set; }
        public string ErrorCode { get; private set; }
        public string ErrorDescription { get; private set; }
        public string AccessToken { get; private set; }
        public string AuthenticationToken { get; private set; }
        public string TokenType { get; private set; }
        public TimeSpan AccessTokenExpiresIn { get; private set; }
        public string[] Scopes { get; private set; }
        public string UserId { get; private set; }
    }
}

FormMicrosoftAccountAuth.designer.cs

namespace OneDriveSamples
{
    partial class FormMicrosoftAccountAuth
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(FormMicrosoftAccountAuth));
            this.webBrowser = new System.Windows.Forms.WebBrowser();
            this.toolStrip1 = new System.Windows.Forms.ToolStrip();
            this.toolStripBackButton = new System.Windows.Forms.ToolStripButton();
            this.toolStripForwardButton = new System.Windows.Forms.ToolStripButton();
            this.toolStrip1.SuspendLayout();
            this.SuspendLayout();
            // 
            // webBrowser
            // 
            this.webBrowser.Dock = System.Windows.Forms.DockStyle.Fill;
            this.webBrowser.Location = new System.Drawing.Point(0, 32);
            this.webBrowser.Margin = new System.Windows.Forms.Padding(2);
            this.webBrowser.MinimumSize = new System.Drawing.Size(15, 16);
            this.webBrowser.Name = "webBrowser";
            this.webBrowser.Size = new System.Drawing.Size(813, 714);
            this.webBrowser.TabIndex = 0;
            // 
            // toolStrip1
            // 
            this.toolStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.toolStripBackButton,
            this.toolStripForwardButton});
            this.toolStrip1.Location = new System.Drawing.Point(0, 0);
            this.toolStrip1.Name = "toolStrip1";
            this.toolStrip1.Size = new System.Drawing.Size(813, 32);
            this.toolStrip1.TabIndex = 1;
            this.toolStrip1.Text = "toolStrip1";
            // 
            // toolStripBackButton
            // 
            this.toolStripBackButton.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Text;
            this.toolStripBackButton.Image = ((System.Drawing.Image)(resources.GetObject("toolStripBackButton.Image")));
            this.toolStripBackButton.ImageTransparentColor = System.Drawing.Color.Magenta;
            this.toolStripBackButton.Name = "toolStripBackButton";
            this.toolStripBackButton.Size = new System.Drawing.Size(69, 29);
            this.toolStripBackButton.Text = "< Back";
            this.toolStripBackButton.Click += new System.EventHandler(this.toolStripButton1_Click);
            // 
            // toolStripForwardButton
            // 
            this.toolStripForwardButton.DisplayStyle = System.Windows.Forms.ToolStripItemDisplayStyle.Text;
            this.toolStripForwardButton.Image = ((System.Drawing.Image)(resources.GetObject("toolStripForwardButton.Image")));
            this.toolStripForwardButton.ImageTransparentColor = System.Drawing.Color.Magenta;
            this.toolStripForwardButton.Name = "toolStripForwardButton";
            this.toolStripForwardButton.Size = new System.Drawing.Size(28, 29);
            this.toolStripForwardButton.Text = ">";
            this.toolStripForwardButton.Click += new System.EventHandler(this.toolStripButton2_Click);
            // 
            // FormMicrosoftAccountAuth
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 20F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(813, 746);
            this.Controls.Add(this.webBrowser);
            this.Controls.Add(this.toolStrip1);
            this.Margin = new System.Windows.Forms.Padding(2);
            this.Name = "FormMicrosoftAccountAuth";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;
            this.Text = "FormMicrosoftAccountAuth";
            this.Load += new System.EventHandler(this.FormMicrosoftAccountAuth_Load);
            this.toolStrip1.ResumeLayout(false);
            this.toolStrip1.PerformLayout();
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.WebBrowser webBrowser;
        private System.Windows.Forms.ToolStrip toolStrip1;
        private System.Windows.Forms.ToolStripButton toolStripBackButton;
        private System.Windows.Forms.ToolStripButton toolStripForwardButton;
    }
}

FormMicrosoftAccountAuth.resx

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