I have a Windows Forms application which is consuming an OAUTH service. In order to authenticate, I use a Web Browser control to navigate to the service's login page. The user enters username and password, and this works well.
Next, the service displays a "Grant access" page. When the user clicks "Grant access", the page redirects to a URL of my choice, passing the authentication token in the query string.
This worked well on the Windows 7 machine that I developed on. I capture the query string in the Navigating event, hide the web browser control, and can then use the service by using the token I received. But on Windows 8 and Windows Server 2012, the Navigating event never happens. Instead, the Web Browser control displays a 404 error.
Is there some way that I can capture the results of that redirect?
P.S. I tried using an HttpListener, and it worked, but it requires that the application be installed by an Administrator to set up the http bindings.
Try handling the raw BeforeNavigate2 event on the underlying WebBrowser ActiveX, here's a WinForms version (based on the original WPF version):
using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace WindowsForms_22311110
{
public partial class MainForm : Form
{
WebBrowser webBrowser;
public MainForm()
{
InitializeComponent();
this.webBrowser = new WebBrowser();
this.webBrowser.Dock = DockStyle.Fill;
this.Controls.Add(this.webBrowser);
this.webBrowser.Visible = true;
this.Load += MainForm_Load;
}
void MainForm_Load(object sender, EventArgs e)
{
// the below line makes sure the underlying ActiveX gets created
if (this.webBrowser.Document != null || this.webBrowser.ActiveXInstance == null)
throw new InvalidOperationException("webBrowser");
var sink = new WebBrowserEventSink();
sink.Connect(this.webBrowser);
this.webBrowser.Navigate("http://example.com");
}
}
/// <summary>
/// Handling WinForms WebBrowser ActiveX events directly
/// this code depends on SHDocVw.dll COM interop assembly,
/// generate SHDocVw.dll: "tlbimp.exe ieframe.dll",
/// and add as a reference to the project
///
/// by Noseratio - https://stackoverflow.com/a/22312476/1768303
/// </summary>
[ComVisible(true)]
[ClassInterface(ClassInterfaceType.None)]
[ComDefaultInterface(typeof(SHDocVw.DWebBrowserEvents2))]
public class WebBrowserEventSink : SHDocVw.DWebBrowserEvents2
{
System.Runtime.InteropServices.ComTypes.IConnectionPoint _sinkCP = null;
int _sinkCookie = int.MaxValue;
public void Connect(WebBrowser webBrowser)
{
if (_sinkCookie != int.MaxValue)
throw new InvalidOperationException();
var activeXInstance = webBrowser.ActiveXInstance;
var cpc = (System.Runtime.InteropServices.ComTypes.IConnectionPointContainer)activeXInstance;
var guid = typeof(SHDocVw.DWebBrowserEvents2).GUID;
cpc.FindConnectionPoint(ref guid, out _sinkCP);
_sinkCP.Advise(this, out _sinkCookie);
}
public void Disconnect()
{
if (_sinkCookie == int.MaxValue)
throw new InvalidOperationException();
_sinkCP.Unadvise(_sinkCookie);
_sinkCookie = int.MaxValue;
_sinkCP = null;
}
#region SHDocVw.DWebBrowserEvents2
public void StatusTextChange(string Text)
{
}
public void ProgressChange(int Progress, int ProgressMax)
{
}
public void CommandStateChange(int Command, bool Enable)
{
}
public void DownloadBegin()
{
}
public void DownloadComplete()
{
}
public void TitleChange(string Text)
{
}
public void PropertyChange(string szProperty)
{
}
public void BeforeNavigate2(object pDisp, ref object URL, ref object Flags, ref object TargetFrameName, ref object PostData, ref object Headers, ref bool Cancel)
{
MessageBox.Show("BeforeNavigate2: " + URL.ToString());
}
public void NewWindow2(ref object ppDisp, ref bool Cancel)
{
}
public void NavigateComplete2(object pDisp, ref object URL)
{
}
public void DocumentComplete(object pDisp, ref object URL)
{
}
public void OnQuit()
{
}
public void OnVisible(bool Visible)
{
}
public void OnToolBar(bool ToolBar)
{
}
public void OnMenuBar(bool MenuBar)
{
}
public void OnStatusBar(bool StatusBar)
{
}
public void OnFullScreen(bool FullScreen)
{
}
public void OnTheaterMode(bool TheaterMode)
{
}
public void WindowSetResizable(bool Resizable)
{
}
public void WindowSetLeft(int Left)
{
}
public void WindowSetTop(int Top)
{
}
public void WindowSetWidth(int Width)
{
}
public void WindowSetHeight(int Height)
{
}
public void WindowClosing(bool IsChildWindow, ref bool Cancel)
{
}
public void ClientToHostWindow(ref int CX, ref int CY)
{
}
public void SetSecureLockIcon(int SecureLockIcon)
{
}
public void FileDownload(bool ActiveDocument, ref bool Cancel)
{
}
public void NavigateError(object pDisp, ref object URL, ref object Frame, ref object StatusCode, ref bool Cancel)
{
}
public void PrintTemplateInstantiation(object pDisp)
{
}
public void PrintTemplateTeardown(object pDisp)
{
}
public void UpdatePageStatus(object pDisp, ref object nPage, ref object fDone)
{
}
public void PrivacyImpactedStateChange(bool bImpacted)
{
}
public void NewWindow3(ref object ppDisp, ref bool Cancel, uint dwFlags, string bstrUrlContext, string bstrUrl)
{
}
public void SetPhishingFilterStatus(int PhishingFilterStatus)
{
}
public void WindowStateChanged(uint dwWindowStateFlags, uint dwValidFlagsMask)
{
}
public void NewProcess(int lCauseFlag, object pWB2, ref bool Cancel)
{
}
public void ThirdPartyUrlBlocked(ref object URL, uint dwCount)
{
}
public void RedirectXDomainBlocked(object pDisp, ref object StartURL, ref object RedirectURL, ref object Frame, ref object StatusCode)
{
}
public void BeforeScriptExecute(object pDispWindow)
{
}
public void WebWorkerStarted(uint dwUniqueID, string bstrWorkerLabel)
{
}
public void WebWorkerFinsihed(uint dwUniqueID)
{
}
#endregion
}
}
