3.0AuthenticationBuilder&CookieExtensions&JwtBearerExtensions【->IServiceCollection 】

using System;
using System.Diagnostics.CodeAnalysis;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.Extensions.Options;

namespace Microsoft.AspNetCore.Authentication
{
    /// <summary>
    /// Used to configure authentication
    /// </summary>
    public class AuthenticationBuilder
    {
        /// <summary>
        /// Initializes a new instance of <see cref="AuthenticationBuilder"/>.
        /// </summary>
        /// <param name="services">The services being configured.</param>
        public AuthenticationBuilder(IServiceCollection services)
            => Services = services;

        /// <summary>
        /// The services being configured.
        /// </summary>
        public virtual IServiceCollection Services { get; }

        private AuthenticationBuilder AddSchemeHelper<TOptions, [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]THandler>(string authenticationScheme, string? displayName, Action<TOptions>? configureOptions)
            where TOptions : AuthenticationSchemeOptions, new()
            where THandler : class, IAuthenticationHandler
        {
            Services.Configure<AuthenticationOptions>(o =>
            {
                o.AddScheme(authenticationScheme, scheme => {
                    scheme.HandlerType = typeof(THandler);
                    scheme.DisplayName = displayName;
                });
            });
            if (configureOptions != null)
            {
                Services.Configure(authenticationScheme, configureOptions);
            }
            Services.AddOptions<TOptions>(authenticationScheme).Validate(o => {
                o.Validate(authenticationScheme);
                return true;
            });
            Services.AddTransient<THandler>();
            return this;
        }

        /// <summary>
        /// Adds a <see cref="AuthenticationScheme"/> which can be used by <see cref="IAuthenticationService"/>.
        /// </summary>
        /// <typeparam name="TOptions">The <see cref="AuthenticationSchemeOptions"/> type to configure the handler."/>.</typeparam>
        /// <typeparam name="THandler">The <see cref="AuthenticationHandler{TOptions}"/> used to handle this scheme.</typeparam>
        /// <param name="authenticationScheme">The name of this scheme.</param>
        /// <param name="displayName">The display name of this scheme.</param>
        /// <param name="configureOptions">Used to configure the scheme options.</param>
        /// <returns>The builder.</returns>
        public virtual AuthenticationBuilder AddScheme<TOptions, [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]THandler>(string authenticationScheme, string? displayName, Action<TOptions>? configureOptions)
            where TOptions : AuthenticationSchemeOptions, new()
            where THandler : AuthenticationHandler<TOptions>
            => AddSchemeHelper<TOptions, THandler>(authenticationScheme, displayName, configureOptions);

        /// <summary>
        /// Adds a <see cref="AuthenticationScheme"/> which can be used by <see cref="IAuthenticationService"/>.
        /// </summary>
        /// <typeparam name="TOptions">The <see cref="AuthenticationSchemeOptions"/> type to configure the handler."/>.</typeparam>
        /// <typeparam name="THandler">The <see cref="AuthenticationHandler{TOptions}"/> used to handle this scheme.</typeparam>
        /// <param name="authenticationScheme">The name of this scheme.</param>
        /// <param name="configureOptions">Used to configure the scheme options.</param>
        /// <returns>The builder.</returns>
        public virtual AuthenticationBuilder AddScheme<TOptions, [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]THandler>(string authenticationScheme, Action<TOptions>? configureOptions)
            where TOptions : AuthenticationSchemeOptions, new()
            where THandler : AuthenticationHandler<TOptions>
            => AddScheme<TOptions, THandler>(authenticationScheme, displayName: null, configureOptions: configureOptions);

        /// <summary>
        /// Adds a <see cref="RemoteAuthenticationHandler{TOptions}"/> based <see cref="AuthenticationScheme"/> that supports remote authentication
        /// which can be used by <see cref="IAuthenticationService"/>.
        /// </summary>
        /// <typeparam name="TOptions">The <see cref="RemoteAuthenticationOptions"/> type to configure the handler."/>.</typeparam>
        /// <typeparam name="THandler">The <see cref="RemoteAuthenticationHandler{TOptions}"/> used to handle this scheme.</typeparam>
        /// <param name="authenticationScheme">The name of this scheme.</param>
        /// <param name="displayName">The display name of this scheme.</param>
        /// <param name="configureOptions">Used to configure the scheme options.</param>
        /// <returns>The builder.</returns>
        public virtual AuthenticationBuilder AddRemoteScheme<TOptions, [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]THandler>(string authenticationScheme, string? displayName, Action<TOptions>? configureOptions)
            where TOptions : RemoteAuthenticationOptions, new()
            where THandler : RemoteAuthenticationHandler<TOptions>
        {
            Services.TryAddEnumerable(ServiceDescriptor.Singleton<IPostConfigureOptions<TOptions>, EnsureSignInScheme<TOptions>>());
            return AddScheme<TOptions, THandler>(authenticationScheme, displayName, configureOptions: configureOptions);
        }

        /// <summary>
        /// Adds a <see cref="PolicySchemeHandler"/> based authentication handler which can be used to
        /// redirect to other authentication schemes.
        /// </summary>
        /// <param name="authenticationScheme">The name of this scheme.</param>
        /// <param name="displayName">The display name of this scheme.</param>
        /// <param name="configureOptions">Used to configure the scheme options.</param>
        /// <returns>The builder.</returns>
        public virtual AuthenticationBuilder AddPolicyScheme(string authenticationScheme, string? displayName, Action<PolicySchemeOptions> configureOptions)
            => AddSchemeHelper<PolicySchemeOptions, PolicySchemeHandler>(authenticationScheme, displayName, configureOptions);

        // Used to ensure that there's always a default sign in scheme that's not itself
        private class EnsureSignInScheme<TOptions> : IPostConfigureOptions<TOptions> where TOptions : RemoteAuthenticationOptions
        {
            private readonly AuthenticationOptions _authOptions;

            public EnsureSignInScheme(IOptions<AuthenticationOptions> authOptions)
            {
                _authOptions = authOptions.Value;
            }

            public void PostConfigure(string name, TOptions options)
            {
                options.SignInScheme ??= _authOptions.DefaultSignInScheme ?? _authOptions.DefaultScheme;
            }
        }
    }
}

using System;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.Extensions.Options;

namespace Microsoft.Extensions.DependencyInjection
{
    /// <summary>
    /// Extension methods to configure cookie authentication.
    /// </summary>
    public static class CookieExtensions
    {
        /// <summary>
        /// Adds cookie authentication to <see cref="AuthenticationBuilder"/> using the default scheme.
        /// The default scheme is specified by <see cref="CookieAuthenticationDefaults.AuthenticationScheme"/>.
        /// <para>
        /// Cookie authentication uses a HTTP cookie persisted in the client to perform authentication.
        /// </para>
        /// </summary>
        /// <param name="builder">The <see cref="AuthenticationBuilder"/>.</param>
        /// <returns>A reference to <paramref name="builder"/> after the operation has completed.</returns>
        public static AuthenticationBuilder AddCookie(this AuthenticationBuilder builder)
            => builder.AddCookie(CookieAuthenticationDefaults.AuthenticationScheme);

        /// <summary>
        /// Adds cookie authentication to <see cref="AuthenticationBuilder"/> using the specified scheme.
        /// <para>
        /// Cookie authentication uses a HTTP cookie persisted in the client to perform authentication.
        /// </para>
        /// </summary>
        /// <param name="builder">The <see cref="AuthenticationBuilder"/>.</param>
        /// <param name="authenticationScheme">The authentication scheme.</param>
        /// <returns>A reference to <paramref name="builder"/> after the operation has completed.</returns>
        public static AuthenticationBuilder AddCookie(this AuthenticationBuilder builder, string authenticationScheme)
            => builder.AddCookie(authenticationScheme, configureOptions: null!);

        /// <summary>
        /// Adds cookie authentication to <see cref="AuthenticationBuilder"/> using the default scheme.
        /// The default scheme is specified by <see cref="CookieAuthenticationDefaults.AuthenticationScheme"/>.
        /// <para>
        /// Cookie authentication uses a HTTP cookie persisted in the client to perform authentication.
        /// </para>
        /// </summary>
        /// <param name="builder">The <see cref="AuthenticationBuilder"/>.</param>
        /// <param name="configureOptions">A delegate to configure <see cref="CookieAuthenticationOptions"/>.</param>
        /// <returns>A reference to <paramref name="builder"/> after the operation has completed.</returns>
        public static AuthenticationBuilder AddCookie(this AuthenticationBuilder builder, Action<CookieAuthenticationOptions> configureOptions)
            => builder.AddCookie(CookieAuthenticationDefaults.AuthenticationScheme, configureOptions);

        /// <summary>
        /// Adds cookie authentication to <see cref="AuthenticationBuilder"/> using the specified scheme.
        /// <para>
        /// Cookie authentication uses a HTTP cookie persisted in the client to perform authentication.
        /// </para>
        /// </summary>
        /// <param name="builder">The <see cref="AuthenticationBuilder"/>.</param>
        /// <param name="authenticationScheme">The authentication scheme.</param>
        /// <param name="configureOptions">A delegate to configure <see cref="CookieAuthenticationOptions"/>.</param>
        /// <returns>A reference to <paramref name="builder"/> after the operation has completed.</returns>
        public static AuthenticationBuilder AddCookie(this AuthenticationBuilder builder, string authenticationScheme, Action<CookieAuthenticationOptions> configureOptions)
            => builder.AddCookie(authenticationScheme, displayName: null, configureOptions: configureOptions);

        /// <summary>
        /// Adds cookie authentication to <see cref="AuthenticationBuilder"/> using the specified scheme.
        /// <para>
        /// Cookie authentication uses a HTTP cookie persisted in the client to perform authentication.
        /// </para>
        /// </summary>
        /// <param name="builder">The <see cref="AuthenticationBuilder"/>.</param>
        /// <param name="authenticationScheme">The authentication scheme.</param>
        /// <param name="displayName">A display name for the authentication handler.</param>
        /// <param name="configureOptions">A delegate to configure <see cref="CookieAuthenticationOptions"/>.</param>
        /// <returns>A reference to <paramref name="builder"/> after the operation has completed.</returns>
        public static AuthenticationBuilder AddCookie(this AuthenticationBuilder builder, string authenticationScheme, string? displayName, Action<CookieAuthenticationOptions> configureOptions)
        {
            builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<IPostConfigureOptions<CookieAuthenticationOptions>, PostConfigureCookieAuthenticationOptions>());
            builder.Services.AddOptions<CookieAuthenticationOptions>(authenticationScheme).Validate(o => o.Cookie.Expiration == null, "Cookie.Expiration is ignored, use ExpireTimeSpan instead.");
            return builder.AddScheme<CookieAuthenticationOptions, CookieAuthenticationHandler>(authenticationScheme, displayName, configureOptions);
        }
    }
}

using System;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.Extensions.Options;

namespace Microsoft.Extensions.DependencyInjection
{
    /// <summary>
    /// Extension methods to configure JWT bearer authentication.
    /// </summary>
    public static class JwtBearerExtensions
    {
        /// <summary>
        /// Enables JWT-bearer authentication using the default scheme <see cref="JwtBearerDefaults.AuthenticationScheme"/>.
        /// <para>
        /// JWT bearer authentication performs authentication by extracting and validating a JWT token from the <c>Authorization</c> request header.
        /// </para>
        /// </summary>
        /// <param name="builder">The <see cref="AuthenticationBuilder"/>.</param>
        /// <returns>A reference to <paramref name="builder"/> after the operation has completed.</returns>
        public static AuthenticationBuilder AddJwtBearer(this AuthenticationBuilder builder)
            => builder.AddJwtBearer(JwtBearerDefaults.AuthenticationScheme, _ => { });

        /// <summary>
        /// Enables JWT-bearer authentication using the default scheme <see cref="JwtBearerDefaults.AuthenticationScheme"/>.
        /// <para>
        /// JWT bearer authentication performs authentication by extracting and validating a JWT token from the <c>Authorization</c> request header.
        /// </para>
        /// </summary>
        /// <param name="builder">The <see cref="AuthenticationBuilder"/>.</param>
        /// <param name="configureOptions">A delegate that allows configuring <see cref="JwtBearerOptions"/>.</param>
        /// <returns>A reference to <paramref name="builder"/> after the operation has completed.</returns>
        public static AuthenticationBuilder AddJwtBearer(this AuthenticationBuilder builder, Action<JwtBearerOptions> configureOptions)
            => builder.AddJwtBearer(JwtBearerDefaults.AuthenticationScheme, configureOptions);

        /// <summary>
        /// Enables JWT-bearer authentication using the specified scheme.
        /// <para>
        /// JWT bearer authentication performs authentication by extracting and validating a JWT token from the <c>Authorization</c> request header.
        /// </para>
        /// </summary>
        /// <param name="builder">The <see cref="AuthenticationBuilder"/>.</param>
        /// <param name="authenticationScheme">The authentication scheme.</param>
        /// <param name="configureOptions">A delegate that allows configuring <see cref="JwtBearerOptions"/>.</param>
        /// <returns>A reference to <paramref name="builder"/> after the operation has completed.</returns>
        public static AuthenticationBuilder AddJwtBearer(this AuthenticationBuilder builder, string authenticationScheme, Action<JwtBearerOptions> configureOptions)
            => builder.AddJwtBearer(authenticationScheme, displayName: null, configureOptions: configureOptions);

        /// <summary>
        /// Enables JWT-bearer authentication using the specified scheme.
        /// <para>
        /// JWT bearer authentication performs authentication by extracting and validating a JWT token from the <c>Authorization</c> request header.
        /// </para>
        /// </summary>
        /// <param name="builder">The <see cref="AuthenticationBuilder"/>.</param>
        /// <param name="authenticationScheme">The authentication scheme.</param>
        /// <param name="displayName">The display name for the authentication handler.</param>
        /// <param name="configureOptions">A delegate that allows configuring <see cref="JwtBearerOptions"/>.</param>
        /// <returns>A reference to <paramref name="builder"/> after the operation has completed.</returns>
        public static AuthenticationBuilder AddJwtBearer(this AuthenticationBuilder builder, string authenticationScheme, string? displayName, Action<JwtBearerOptions> configureOptions)
        {
            builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<IPostConfigureOptions<JwtBearerOptions>, JwtBearerPostConfigureOptions>());
            return builder.AddScheme<JwtBearerOptions, JwtBearerHandler>(authenticationScheme, displayName, configureOptions);
        }
    }
}