Initial commit

Backend/Security/Authentication/Options/JwtTokenAuthenticationHandlerOptions.cs

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+using Microsoft.AspNetCore.Authentication;
+
+namespace Backend.Security.Authentication {
+    public class JwtTokenAuthenticationHandlerOptions : AuthenticationSchemeOptions {
+        // Options for the authentication handler.
+        // Currently: None
+    }
+}

Backend/Security/Authentication/Options/JwtTokenAuthenticationOptions.cs

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+using Backend.Options;
+
+namespace Backend.Security.Authentication {
+    public class JwtTokenAuthenticationOptions : OptionsFromConfiguration {
+        public override string Position => "Authentication";
+
+        public string RefreshTokenExpirationTimeInHours { get; set; }
+        public string AccessTokenExpirationTimeInMinutes { get; set; }
+        public string DebugAccessToken { get; set; }
+    }
+}

Backend/Security/Authentication/Options/OptionsFromConfiguration.cs

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+namespace Backend.Options {
+    public abstract class OptionsFromConfiguration {
+        public abstract string Position { get; }
+    }
+}

Backend/Security/Authentication/Options/OptionsFromConfigurationExtensions.cs

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+namespace Backend.Options {
+    public static class OptionsFromConfigurationExtensions {
+        public static T AddOptionsFromConfiguration<T>(this IServiceCollection services, IConfiguration configuration)
+            where T : OptionsFromConfiguration {
+            T optionsInstance = (T)Activator.CreateInstance(typeof(T));
+            if (optionsInstance == null) return null;
+            string position = optionsInstance.Position;
+            services.Configure((Action<T>)(options => {
+                IConfigurationSection section = configuration.GetSection(position);
+                if (section != null) {
+                    section.Bind(options);
+                }
+            }));
+            return optionsInstance;
+        }
+    }
+}