How to deal with authenticity in outlook mailbox in C#

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I'm trying to retrieve and read emails from my Outlook mail. Unfortunately my mailbox uses Authenticity, which I need to deal with. I have tried a mailbox that does not use Authenticity and the code works. I followed the instructions here
https://www.emailarchitect.net/eagetmail/ex/c/22.aspx

(I used the library to read a mailbox that does not use OAuth). So I registered my application on Microsoft Azure as instructed (except for authentication, which was the last step). Unfortunately I get this error

System.ComponentModel.Win32Exception
HResult=0x80004005 Message=System cannot find the specified file. Source=System.Diagnostics.Process

I also tried another library https://afterlogic.com/mailbee-net/docs/OAuth2MicrosoftRegularAccountsInstalledApps.html

But with the same result It is larger project, so I will post method where I am getting the error. I will paste more code, if you will need it. Feel free to ask. Thanks for any advice.(The documentation is great, so I didn't want to change it)

C#

const string clientID = "Client ID";
        const string clientSecret = "client Secret";
        const string scope = "https://outlook.office.com/IMAP.AccessAsUser.All%20https://outlook.office.com/POP.AccessAsUser.All%20offline_access%20email%20openid";
        const string authUri = "https://login.microsoftonline.com/common/oauth2/v2.0/authorize";
        const string tokenUri = "https://login.microsoftonline.com/common/oauth2/v2.0/token";

        static int GetRandomUnusedPort()
        {
            var listener = new TcpListener(IPAddress.Loopback, 0);
            listener.Start();
            var port = ((IPEndPoint)listener.LocalEndpoint).Port;
            listener.Stop();
            return port;
        }

        async void DoOauthAndRetrieveEmail()
        {
            // Creates a redirect URI using an available port on the loopback address.
            string redirectUri = string.Format("http://127.0.0.1:{0}/", GetRandomUnusedPort());
            Console.WriteLine("redirect URI: " + redirectUri);

            // Creates an HttpListener to listen for requests on that redirect URI.
            var http = new HttpListener();
            http.Prefixes.Add(redirectUri);
            Console.WriteLine("Listening ...");
            http.Start();

            // Creates the OAuth 2.0 authorization request.
            string authorizationRequest = string.Format("{0}?response_type=code&scope={1}&redirect_uri={2}&client_id={3}&prompt=login",
                authUri,
                scope,
                Uri.EscapeDataString(redirectUri),
                clientID
            );

            // Opens request in the browser.
            //There is issue
            System.Diagnostics.Process.Start(authorizationRequest);

            // Waits for the OAuth authorization response.
            var context = await http.GetContextAsync();

            // Brings the Console to Focus.
            BringConsoleToFront();

            // Sends an HTTP response to the browser.
            var response = context.Response;
            string responseString = string.Format("<html><head></head><body>Please return to the app and close current window.</body></html>");
            var buffer = Encoding.UTF8.GetBytes(responseString);
            response.ContentLength64 = buffer.Length;
            var responseOutput = response.OutputStream;
            Task responseTask = responseOutput.WriteAsync(buffer, 0, buffer.Length).ContinueWith((task) =>
            {
                responseOutput.Close();
                http.Stop();
                Console.WriteLine("HTTP server stopped.");
            });

            // Checks for errors.
            if (context.Request.QueryString.Get("error") != null)
            {
                Console.WriteLine(string.Format("OAuth authorization error: {0}.", context.Request.QueryString.Get("error")));
                return;
            }

            if (context.Request.QueryString.Get("code") == null)
            {
                Console.WriteLine("Malformed authorization response. " + context.Request.QueryString);
                return;
            }

            // extracts the code
            var code = context.Request.QueryString.Get("code");
            Console.WriteLine("Authorization code: " + code);

            string responseText = await RequestAccessToken(code, redirectUri);
            Console.WriteLine(responseText);

            OAuthResponseParser parser = new OAuthResponseParser();
            parser.Load(responseText);

            var user = parser.EmailInIdToken;
            var accessToken = parser.AccessToken;

            Console.WriteLine("User: {0}", user);
            Console.WriteLine("AccessToken: {0}", accessToken);

            RetrieveMailWithXOAUTH2(user, accessToken);
        }

What I have tried:

Using different libraries. A lot of googling.

Posted 24-Jul-22 21:41pm

Petr Barabáš

Updated 24-Jul-22 23:45pm

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Comments

Richard Deeming 25-Jul-22 4:39am

If Process.Start can't open an https: URL, that suggests there's no web browser installed or configured. Is this code running on a server, or is it a desktop application?

Microsoft's recommended email library is MailKit - you might have better luck with that:
GitHub - jstedfast/MailKit: A cross-platform .NET library for IMAP, POP3, and SMTP.[^]
MimeKit[^]

Petr Barabáš 25-Jul-22 4:43am

No, it's not going anywhere. I just tried it in the console. So should I edit the App file?

Richard Deeming 25-Jul-22 5:02am

As I said, if you're getting a "file not found" error trying to launch an https: URL via Process.Start, that would suggest you don't have a default browser installed and configured.

What happens if you right-click on the start button, select "Run", type in eg: "https://www.codeproject.com/", and click "OK" - do you get a browser, or do you get an error message?

Also, which version of .NET are you using? There are some differences in the Process class between .NET Framework 4.x and .NET Core/5/6/...

Petr Barabáš 25-Jul-22 5:17am

Maybe I should paste code where I am using MailKit and it is much shorter?

Richard Deeming 25-Jul-22 5:35am

Your question says you're getting an error when you try to launch an https: URL using Process.Start.

Either your system doesn't have a web browser installed and configured, or you're using .NET Core, .NET 5, or .NET 6, where the Process class behaves differently.

Petr Barabáš 25-Jul-22 5:38am

I am using .NET CORE 3.1

Petr Barabáš 25-Jul-22 5:45am

The problem is, I think, with Authenticity. Doesn't matter which Library I am using, always cannoct pass through and receive emails

Petr Barabáš 25-Jul-22 5:04am

Btw. I'have tried MailKit Library, but got MailKit.Security.AuthenticationException: 'LOGIN failed.' error...

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Accepted Answer · 2022-07-24T23:45:00

Quote:
I am using .NET CORE 3.1

In which case, you need to explicitly specify that you want to UseShellExecute to launch your URL.

C#

System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo
{
    FileName = authorizationRequest,
    UseShellExecute = true,
});

ProcessStartInfo.UseShellExecute Property (System.Diagnostics) | Microsoft Docs[^]:
The default is true on .NET Framework apps and false on .NET Core apps.

How to deal with authenticity in outlook mailbox in C#

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