Skip to content

Instantly share code, notes, and snippets.

@jnm2

jnm2/ImplicitFlowOAuthClient.cs

Last active September 17, 2025 01:45
Show Gist options
  • Save jnm2/549f436f8ab2034335b26f2a82c5db4d to your computer and use it in GitHub Desktop.
Save jnm2/549f436f8ab2034335b26f2a82c5db4d to your computer and use it in GitHub Desktop.
Download ZIP
Raw
ImplicitFlowOAuthClient.cs
using System.Collections.Specialized;
using System.Diagnostics;
using System.Net;
using System.Web;
public static class ImplicitFlowOAuthClient
{
public static async Task<ImplicitFlowOAuthResult> AuthorizeAsync(
string authorityUri,
string clientId,
string redirectUri,
string scope)
{
OpenSystemWebBrowser(
$"{authorityUri}/connect/authorize" +
$"?response_type=token" +
$"&client_id={Uri.EscapeDataString(clientId)}" +
$"&redirect_uri={Uri.EscapeDataString(redirectUri)}" +
$"&scope={Uri.EscapeDataString(scope)}");
var authResult = await RunTokenCapturingWebsiteAsync(redirectUri);
var error = authResult["error"];
if (error != null)
return new ImplicitFlowOAuthResult.Error(error);
return new ImplicitFlowOAuthResult.Success(
authResult["token_type"]!,
authResult["access_token"]!,
authResult["expires_in"],
authResult["scope"]);
}
private static void OpenSystemWebBrowser(string url)
{
Process.Start(new ProcessStartInfo { UseShellExecute = true, FileName = url });
}
private static async Task<NameValueCollection> RunTokenCapturingWebsiteAsync(string redirectUri)
{
using var http = new HttpListener();
http.Prefixes.Add(redirectUri);
http.Start();
var incomingGet = await http.GetContextAsync();
await using (incomingGet.Request.InputStream)
await using (incomingGet.Response.OutputStream)
{
if (incomingGet.Request.HttpMethod != HttpMethod.Get.Method)
throw new InvalidOperationException("Expected GET");
incomingGet.Response.ContentType = "text/html; charset=UTF-8";
incomingGet.Response.ContentLength64 = WebResources.RedirectLandingPage.Length;
await incomingGet.Response.OutputStream.WriteAsync(WebResources.RedirectLandingPage);
}
var incomingPost = await http.GetContextAsync();
await using (incomingPost.Request.InputStream)
await using (incomingPost.Response.OutputStream)
{
if (incomingPost.Request.HttpMethod != HttpMethod.Post.Method)
throw new InvalidOperationException("Expected POST");
using var reader = new StreamReader(incomingPost.Request.InputStream, incomingPost.Request.ContentEncoding, leaveOpen: true);
var body = await reader.ReadToEndAsync();
return HttpUtility.ParseQueryString(body);
}
}
}
Raw
RedirectLandingPage.html
<!DOCTYPE html>
<html>
<head>
<title>ClockifyToAcumatica Login</title>
<style>
body {
font-family: system-ui;
margin: 0;
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
}
h1 {
font-weight: lighter;
opacity: 30%;
margin-top: 0;
}
</style>
</head>
<body>
<main>
<h1>ClockifyToAcumatica</h1>
<div id="message">Please wait...</div>
</main>
<script>
(async function() {
const urlFragmentData = window.location.hash.substring(1);
history.replaceState({}, '', '/');
try {
await fetch('/', {
method: 'POST',
headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
body: urlFragmentData,
});
document.getElementById('message').innerText = 'You may now close this tab.';
} catch (error) {
console.error(error);
document.getElementById('message').innerText = 'There was an unexpected problem communicating with ClockifyToAcumatica.exe: ' + error;
}
})();
</script>
</body>
</html>
Raw
WebResources.resx
<?xml version="1.0" encoding="utf-8"?>
<root>
<!--
Microsoft ResX Schema
Version 2.0
The primary goals of this format is to allow a simple XML format
that is mostly human readable. The generation and parsing of the
various data types are done through the TypeConverter classes
associated with the data types.
Example:
... ado.net/XML headers & schema ...
<resheader name="resmimetype">text/microsoft-resx</resheader>
<resheader name="version">2.0</resheader>
<resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
<resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
<data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
<data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
<data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
<value>[base64 mime encoded serialized .NET Framework object]</value>
</data>
<data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
<value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
<comment>This is a comment</comment>
</data>
There are any number of "resheader" rows that contain simple
name/value pairs.
Each data row contains a name, and value. The row also contains a
type or mimetype. Type corresponds to a .NET class that support
text/value conversion through the TypeConverter architecture.
Classes that don't support this are serialized and stored with the
mimetype set.
The mimetype is used for serialized objects, and tells the
ResXResourceReader how to depersist the object. This is currently not
extensible. For a given mimetype the value must be set accordingly:
Note - application/x-microsoft.net.object.binary.base64 is the format
that the ResXResourceWriter will generate, however the reader can
read any of the formats listed below.
mimetype: application/x-microsoft.net.object.binary.base64
value : The object must be serialized with
: System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
: and then encoded with base64 encoding.
mimetype: application/x-microsoft.net.object.soap.base64
value : The object must be serialized with
: System.Runtime.Serialization.Formatters.Soap.SoapFormatter
: and then encoded with base64 encoding.
mimetype: application/x-microsoft.net.object.bytearray.base64
value : The object must be serialized into a byte array
: using a System.ComponentModel.TypeConverter
: and then encoded with base64 encoding.
-->
<xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
<xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
<xsd:element name="root" msdata:IsDataSet="true">
<xsd:complexType>
<xsd:choice maxOccurs="unbounded">
<xsd:element name="metadata">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="value" type="xsd:string" minOccurs="0" />
</xsd:sequence>
<xsd:attribute name="name" use="required" type="xsd:string" />
<xsd:attribute name="type" type="xsd:string" />
<xsd:attribute name="mimetype" type="xsd:string" />
<xsd:attribute ref="xml:space" />
</xsd:complexType>
</xsd:element>
<xsd:element name="assembly">
<xsd:complexType>
<xsd:attribute name="alias" type="xsd:string" />
<xsd:attribute name="name" type="xsd:string" />
</xsd:complexType>
</xsd:element>
<xsd:element name="data">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
<xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
</xsd:sequence>
<xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
<xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
<xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
<xsd:attribute ref="xml:space" />
</xsd:complexType>
</xsd:element>
<xsd:element name="resheader">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
</xsd:sequence>
<xsd:attribute name="name" type="xsd:string" use="required" />
</xsd:complexType>
</xsd:element>
</xsd:choice>
</xsd:complexType>
</xsd:element>
</xsd:schema>
<resheader name="resmimetype">
<value>text/microsoft-resx</value>
</resheader>
<resheader name="version">
<value>2.0</value>
</resheader>
<resheader name="reader">
<value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
</resheader>
<resheader name="writer">
<value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
</resheader>
<assembly alias="System.Windows.Forms" name="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
<data name="RedirectLandingPage" type="System.Resources.ResXFileRef, System.Windows.Forms">
<value>RedirectLandingPage.html;System.Byte[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
</data>
</root>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment