From 7b74dbfdc1be020ff197c3527873e700fd09ca09 Mon Sep 17 00:00:00 2001
From: Brian Demers <bdemers@apache.org>
Date: Tue, 1 Feb 2022 11:06:39 -0500
Subject: [PATCH] Idea: Allow Configuration to be parsed automatically

Related to: #197
---
 .../OktaAuthenticationOptionsExtensions.cs    | 18 ++++++++
 Okta.AspNetCore/OktaWebApiOptions.cs          | 45 +++++++++++++++++++
 2 files changed, 63 insertions(+)

diff --git a/Okta.AspNetCore/OktaAuthenticationOptionsExtensions.cs b/Okta.AspNetCore/OktaAuthenticationOptionsExtensions.cs
index 53b5cf7..273c82f 100644
--- a/Okta.AspNetCore/OktaAuthenticationOptionsExtensions.cs
+++ b/Okta.AspNetCore/OktaAuthenticationOptionsExtensions.cs
@@ -10,6 +10,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.JwtBearer;
 using Microsoft.AspNetCore.Authentication.OpenIdConnect;
+using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Okta.AspNet.Abstractions;
 
@@ -38,6 +39,23 @@ public static AuthenticationBuilder AddOktaMvc(this AuthenticationBuilder builde
             return AddCodeFlow(builder, options);
         }
 
+        /// <summary>
+        /// Configures Okta for Web API apps, from global configuration.
+        /// </summary>
+        /// <param name="builder">The application builder.</param>
+        /// <param name="configuration">The configuration to load the Okta properties from.</param>
+        /// <returns>The authentication builder.</returns>
+        public static AuthenticationBuilder AddOktaWebApi(this AuthenticationBuilder builder, IConfiguration configuration)
+        {
+            if (builder == null)
+            {
+                throw new ArgumentNullException(nameof(builder));
+            }
+
+            var options = new OktaWebApiOptions(configuration);
+            return AddOktaWebApi(builder, options);
+        }
+
         /// <summary>
         /// Configures Okta for Web API apps.
         /// </summary>
diff --git a/Okta.AspNetCore/OktaWebApiOptions.cs b/Okta.AspNetCore/OktaWebApiOptions.cs
index f29ef8a..d39b7bc 100644
--- a/Okta.AspNetCore/OktaWebApiOptions.cs
+++ b/Okta.AspNetCore/OktaWebApiOptions.cs
@@ -6,6 +6,7 @@
 using System;
 using System.Net.Http;
 using Microsoft.AspNetCore.Authentication.JwtBearer;
+using Microsoft.Extensions.Configuration;
 
 namespace Okta.AspNetCore
 {
@@ -14,6 +15,50 @@ namespace Okta.AspNetCore
     /// </summary>
     public sealed class OktaWebApiOptions : AspNet.Abstractions.OktaWebApiOptions
     {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="OktaWebApiOptions"/> class.
+        /// </summary>
+        public OktaWebApiOptions()
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="OktaWebApiOptions"/> class.
+        /// </summary>
+        /// <param name="configuration">The configuration object.</param>
+        public OktaWebApiOptions(IConfiguration configuration)
+        {
+            var domain = configuration["Okta:OktaDomain"];
+            if (!string.IsNullOrWhiteSpace(domain))
+            {
+                this.OktaDomain = domain;
+            }
+
+            var authServerId = configuration["Okta:AuthorizationServerId"];
+            if (!string.IsNullOrWhiteSpace(authServerId))
+            {
+                this.AuthorizationServerId = authServerId;
+            }
+
+            var audience = configuration["Okta:Audience"];
+            if (!string.IsNullOrWhiteSpace(audience))
+            {
+                this.Audience = audience;
+            }
+
+            var timeout = configuration["Okta:BackchannelTimeout"];
+            if (!string.IsNullOrWhiteSpace(timeout))
+            {
+                this.BackchannelTimeout = TimeSpan.Parse(timeout);
+            }
+
+            var clockSkew = configuration["Okta:ClockSkew"];
+            if (!string.IsNullOrWhiteSpace(clockSkew))
+            {
+                this.ClockSkew = TimeSpan.Parse(clockSkew);
+            }
+        }
+
         /// <summary>
         /// Gets or sets the JwtBearerEvents.
         /// </summary>