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Set output box to be anchored to the window, so it resizes with it #7

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Set output box to be anchored to the window, so it resizes with it #7

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Set output box to be anchored to the window, so it resizes with it, t…
paulvickerytr Oct 16, 2020
aec812a
Got it all working with WPF / MVVM
paulvickerytr Jan 13, 2021
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46 changes: 46 additions & 0 deletions OAuthDesktopApp/OAuthDesktopApp/GoogleApi/ApiCalls.cs
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using System;
using System.IO;
using System.Net;
using System.Threading.Tasks;

namespace OAuthDesktopApp.GoogleApi
{
public class ApiCalls : GoogleApiBase
{
private const string UserInfoEndpoint = "https://www.googleapis.com/oauth2/v3/userinfo";

public ApiCalls(Action<string> outputCallback) : base(outputCallback)
{
}

public async Task<string> UserinfoCallAsync(GoogleOAuth2 oAuth2)
{
Output("Making API Call to Userinfo...");

// builds the request
string userinfoRequestURI = UserInfoEndpoint;

// sends the request
HttpWebRequest userinfoRequest = (HttpWebRequest)WebRequest.Create(userinfoRequestURI);
userinfoRequest.Method = "GET";
userinfoRequest.Headers.Add(string.Format("Authorization: Bearer {0}", oAuth2.AccessToken));
userinfoRequest.ContentType = "application/x-www-form-urlencoded";
userinfoRequest.Accept = "Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";

// gets the response
WebResponse userinfoResponse = await userinfoRequest.GetResponseAsync();
using (StreamReader userinfoResponseReader = new StreamReader(userinfoResponse.GetResponseStream()))
{
// reads response body
string userinfoResponseText = await userinfoResponseReader.ReadToEndAsync();
Output(userinfoResponseText);

return userinfoResponseText;
}
}

// TODO: add refresh token code

// TODO: make calling code generic
}
}
19 changes: 19 additions & 0 deletions OAuthDesktopApp/OAuthDesktopApp/GoogleApi/GoogleApiBase.cs
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using System;

namespace OAuthDesktopApp.GoogleApi
{
public abstract class GoogleApiBase
{
private readonly Action<string> outputCallback;

protected GoogleApiBase(Action<string> outputCallback)
{
this.outputCallback = outputCallback;
}

protected void Output(string text)
{
this.outputCallback?.Invoke(text);
}
}
}
172 changes: 172 additions & 0 deletions OAuthDesktopApp/OAuthDesktopApp/GoogleApi/GoogleOAuth2.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;
using OAuthDesktopApp.Utilities;

namespace OAuthDesktopApp.GoogleApi
{
public class GoogleOAuth2 : GoogleApiBase
{
// client configuration
private const string ClientID = "581786658708-elflankerquo1a6vsckabbhn25hclla0.apps.googleusercontent.com";
private const string ClientSecret = "3f6NggMbPtrmIBpgx-MK2xXK";
private const string AuthorizationEndpoint = "https://accounts.google.com/o/oauth2/v2/auth";
private const string TokenEndpoint = "https://www.googleapis.com/oauth2/v4/token";
private const string ResponseString = "<html><head><title>Done</title><script>function loaded() { window.close(); }</script></head>" +
"<body onload='loaded()'>Please return to the app.<h4>If this window does not close automatically, please close manually.</h4></body></html>";
private const string CodeChallengeMethod = "S256";

public string AccessToken { get; private set; }

public string RefreshToken { get; private set; }

public GoogleOAuth2(Action<string> outputCallback) : base(outputCallback)
{
}

public async Task PerformAuthenticationAsync(Action activateCallback)
{
// Clear any previous tokens
this.AccessToken = null;
this.RefreshToken = null;

// Generates state and PKCE values.
string state = OAuthHelpers.RandomDataBase64url(32);
string codeVerifier = OAuthHelpers.RandomDataBase64url(32);
string codeChallenge = OAuthHelpers.Base64urlencodeNoPadding(OAuthHelpers.Sha256(codeVerifier));

// Creates a redirect URI using an available port on the loopback address.
string redirectURI = string.Format("http://{0}:{1}/", IPAddress.Loopback, OAuthHelpers.GetRandomUnusedPort());
Output("redirect URI: " + redirectURI);

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

// Creates the OAuth 2.0 authorization request.
string authorizationRequest = string.Format("{0}?response_type=code&scope=openid%20profile&redirect_uri={1}&client_id={2}&state={3}&code_challenge={4}&code_challenge_method={5}",
AuthorizationEndpoint,
System.Uri.EscapeDataString(redirectURI),
ClientID,
state,
codeChallenge,
CodeChallengeMethod);

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

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

// Brings this app back to the foreground.
activateCallback?.Invoke();

// Sends an HTTP response to the browser.
var response = context.Response;

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)
{
throw new OAuthException(string.Format("OAuth authorization error: {0}.", context.Request.QueryString.Get("error")));
}

if (context.Request.QueryString.Get("code") == null
|| context.Request.QueryString.Get("state") == null)
{
throw new OAuthException("Malformed authorization response. " + context.Request.QueryString);
}

// extracts the code
var code = context.Request.QueryString.Get("code");
var incoming_state = context.Request.QueryString.Get("state");

// Compares the receieved state to the expected value, to ensure that
// this app made the request which resulted in authorization.
if (incoming_state != state)
{
throw new OAuthException(string.Format("Received request with invalid state ({0})", incoming_state));
}

Output("Authorization code: " + code);

// Starts the code exchange at the Token Endpoint.
await PerformCodeExchange(code, codeVerifier, redirectURI);
}

private async Task PerformCodeExchange(string code, string code_verifier, string redirectURI)
{
Output("Exchanging code for tokens...");

// builds the request
string tokenRequestURI = TokenEndpoint;
string tokenRequestBody = string.Format("code={0}&redirect_uri={1}&client_id={2}&code_verifier={3}&client_secret={4}&scope=&grant_type=authorization_code",
code,
System.Uri.EscapeDataString(redirectURI),
ClientID,
code_verifier,
ClientSecret
);

// sends the request
HttpWebRequest tokenRequest = (HttpWebRequest)WebRequest.Create(tokenRequestURI);
tokenRequest.Method = "POST";
tokenRequest.ContentType = "application/x-www-form-urlencoded";
tokenRequest.Accept = "Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
byte[] _byteVersion = Encoding.ASCII.GetBytes(tokenRequestBody);
tokenRequest.ContentLength = _byteVersion.Length;
Stream stream = tokenRequest.GetRequestStream();
await stream.WriteAsync(_byteVersion, 0, _byteVersion.Length);
stream.Close();

try
{
// gets the response
WebResponse tokenResponse = await tokenRequest.GetResponseAsync();
using (StreamReader reader = new StreamReader(tokenResponse.GetResponseStream()))
{
// reads response body
string responseText = await reader.ReadToEndAsync();
Output(responseText);

// converts to dictionary
Dictionary<string, string> tokenEndpointDecoded = JsonConvert.DeserializeObject<Dictionary<string, string>>(responseText);

this.AccessToken = tokenEndpointDecoded["access_token"];
this.RefreshToken = tokenEndpointDecoded["refresh_token"];
}
}
catch (WebException ex)
{
if (ex.Status == WebExceptionStatus.ProtocolError)
{
if (ex.Response is HttpWebResponse response)
{
Output("HTTP: " + response.StatusCode);
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
// reads response body
string responseText = await reader.ReadToEndAsync();
Output(responseText);
}
}
}
}
}
}
}
19 changes: 13 additions & 6 deletions OAuthDesktopApp/OAuthDesktopApp/MainWindow.xaml
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Expand Up @@ -22,13 +22,20 @@ limitations under the License.
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525"
>
<Grid>
<Button x:Name="button" HorizontalAlignment="Left" Margin="18,22,0,0" VerticalAlignment="Top" Width="206" Height="46" Click="button_Click"
<Grid>
<Button x:Name="button" HorizontalAlignment="Left" Margin="18,22,0,0" VerticalAlignment="Top" Width="206" Height="46" Click="Button_Click"
BorderThickness="0" Padding="0" Background="Transparent">
<Image Source="Assets/btn_google_sign-in.png" Stretch="UniformToFill"/>
</Button>
<TextBox x:Name="textBoxOutput" HorizontalAlignment="Left" Height="209" Margin="22,89,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Width="470"
<Image Source="Assets/btn_google_sign-in.png" Stretch="UniformToFill"/>
</Button>
<TextBox x:Name="textBoxOutput" Margin="22,89,25,21" TextWrapping="Wrap" Text="{Binding OutputText}"
IsReadOnly="True" ScrollViewer.VerticalScrollBarVisibility="Auto"
/>
</Grid>
<Label x:Name="label" Content="{Binding Name}" Margin="229,34,76,0" VerticalAlignment="Top"/>
<Ellipse x:Name="contactImageFrame" Height="46" Width="46" Margin="0,22,25,0" VerticalAlignment="Top" HorizontalAlignment="Right">
<Ellipse.Fill>
<ImageBrush x:Name="contactImage" ImageSource="{Binding ImageSource}">
</ImageBrush>
</Ellipse.Fill>
</Ellipse>
</Grid>
</Window>
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