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Creating Authorize and EndSession URLs

The RequestUrl class is a helper for creating URLs with query string parameters, e.g.:

var ru = new RequestUrl("https://server/endpoint");


// produces https://server/endpoint?foo=foo&bar=bar
var url = ru.Create(new
    {
        foo: "foo",
        bar: "bar"
    });

As a parameter to the Create method you can either pass in an object, or a string dictionary. In both cases the properties/values will be serialized to key/value pairs.

Authorization Endpoint

Section titled “Authorization Endpoint”

For most cases, the OAuth 2.0 and OpenID Connect authorization endpoint expects a GET request with a number of query string parameters.

The CreateAuthorizeUrl extension method creates URLs for the authorize endpoint - it has support the most common parameters:

/// <summary>
/// Creates an authorize URL.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="clientId">The client identifier.</param>
/// <param name="responseType">The response type.</param>
/// <param name="scope">The scope.</param>
/// <param name="redirectUri">The redirect URI.</param>
/// <param name="state">The state.</param>
/// <param name="nonce">The nonce.</param>
/// <param name="loginHint">The login hint.</param>
/// <param name="acrValues">The acr values.</param>
/// <param name="prompt">The prompt.</param>
/// <param name="responseMode">The response mode.</param>
/// <param name="codeChallenge">The code challenge.</param>
/// <param name="codeChallengeMethod">The code challenge method.</param>
/// <param name="display">The display option.</param>
/// <param name="maxAge">The max age.</param>
/// <param name="uiLocales">The ui locales.</param>
/// <param name="idTokenHint">The id_token hint.</param>
/// <param name="extra">Extra parameters.</param>
/// <returns></returns>
public static string CreateAuthorizeUrl(this RequestUrl request,
    string clientId,
    string responseType,
    string scope = null,
    string redirectUri = null,
    string state = null,
    string nonce = null,
    string loginHint = null,
    string acrValues = null,
    string prompt = null,
    string responseMode = null,
    string codeChallenge = null,
    string codeChallengeMethod = null,
    string display = null,
    int? maxAge = null,
    string uiLocales = null,
    string idTokenHint = null,
    object extra = null)
{ ... }

Example:

var ru = new RequestUrl("https://demo.duendesoftware.com/connect/authorize");


var url = ru.CreateAuthorizeUrl(
    clientId: "client",
    responseType: "implicit",
    redirectUri: "https://app.com/callback",
    nonce: "xyz",
    scope: "openid");

EndSession Endpoint

Section titled “EndSession Endpoint”

The CreateEndSessionUrl extensions methods supports the most common parameters:

/// <summary>
/// Creates a end_session URL.
/// </summary>
/// <param name="request">The request.</param>
/// <param name="idTokenHint">The id_token hint.</param>
/// <param name="postLogoutRedirectUri">The post logout redirect URI.</param>
/// <param name="state">The state.</param>
/// <param name="extra">The extra parameters.</param>
/// <returns></returns>
public static string CreateEndSessionUrl(this RequestUrl request,
    string idTokenHint = null,
    string postLogoutRedirectUri = null,
    string state = null,
    object extra = null)
{ ... }