added user confirmation extension method (#14409)

src/Identity/Extensions.Core/ref/Microsoft.Extensions.Identity.Core.netcoreapp.cs

@@ -57,6 +57,7 @@ namespace Microsoft.AspNetCore.Identity
         public virtual Microsoft.AspNetCore.Identity.IdentityBuilder AddRoleValidator<TRole>() where TRole : class { throw null; }
         public virtual Microsoft.AspNetCore.Identity.IdentityBuilder AddTokenProvider(string providerName, System.Type provider) { throw null; }
         public virtual Microsoft.AspNetCore.Identity.IdentityBuilder AddTokenProvider<TProvider>(string providerName) where TProvider : class { throw null; }
+        public virtual Microsoft.AspNetCore.Identity.IdentityBuilder AddUserConfirmation<TUserConfirmation>() where TUserConfirmation : class { throw null; }
         public virtual Microsoft.AspNetCore.Identity.IdentityBuilder AddUserManager<TUserManager>() where TUserManager : class { throw null; }
         public virtual Microsoft.AspNetCore.Identity.IdentityBuilder AddUserStore<TStore>() where TStore : class { throw null; }
         public virtual Microsoft.AspNetCore.Identity.IdentityBuilder AddUserValidator<TValidator>() where TValidator : class { throw null; }

src/Identity/Extensions.Core/ref/Microsoft.Extensions.Identity.Core.netstandard2.0.cs

@@ -57,6 +57,7 @@ namespace Microsoft.AspNetCore.Identity
         public virtual Microsoft.AspNetCore.Identity.IdentityBuilder AddRoleValidator<TRole>() where TRole : class { throw null; }
         public virtual Microsoft.AspNetCore.Identity.IdentityBuilder AddTokenProvider(string providerName, System.Type provider) { throw null; }
         public virtual Microsoft.AspNetCore.Identity.IdentityBuilder AddTokenProvider<TProvider>(string providerName) where TProvider : class { throw null; }
+        public virtual Microsoft.AspNetCore.Identity.IdentityBuilder AddUserConfirmation<TUserConfirmation>() where TUserConfirmation : class { throw null; }
         public virtual Microsoft.AspNetCore.Identity.IdentityBuilder AddUserManager<TUserManager>() where TUserManager : class { throw null; }
         public virtual Microsoft.AspNetCore.Identity.IdentityBuilder AddUserStore<TStore>() where TStore : class { throw null; }
         public virtual Microsoft.AspNetCore.Identity.IdentityBuilder AddUserValidator<TValidator>() where TValidator : class { throw null; }

src/Identity/Extensions.Core/src/IdentityBuilder.cs

@@ -238,5 +238,13 @@ namespace Microsoft.AspNetCore.Identity
             }
             return AddScoped(managerType, typeof(TRoleManager));
         }
+
+        /// <summary>
+        /// Adds a <see cref="IUserConfirmation{TUser}"/> for the <seealso cref="UserType"/>.
+        /// </summary>
+        /// <typeparam name="TUserConfirmation">The type of the user confirmation to add.</typeparam>
+        /// <returns>The current <see cref="IdentityBuilder"/> instance.</returns>
+        public virtual IdentityBuilder AddUserConfirmation<TUserConfirmation>() where TUserConfirmation : class
+            => AddScoped(typeof(IUserConfirmation<>).MakeGenericType(UserType), typeof(TUserConfirmation));
     }
 }

src/Identity/test/Identity.Test/IdentityBuilderTest.cs

@@ -80,6 +80,22 @@ namespace Microsoft.AspNetCore.Identity.Test
             Assert.NotNull(thingy);
         }
 
+        [Fact]
+        public void CanOverrideUserConfirmation()
+        {
+            var services = new ServiceCollection()
+                .AddLogging()
+                .AddSingleton<IConfiguration>(new ConfigurationBuilder().Build());
+            services.AddIdentity<PocoUser, PocoRole>()
+                .AddClaimsPrincipalFactory<MyClaimsPrincipalFactory>()
+                .AddUserConfirmation<MyUserConfirmation>()
+                .AddUserManager<MyUserManager>()
+                .AddUserStore<NoopUserStore>()
+                .AddRoleStore<NoopRoleStore>();
+            var thingy = services.BuildServiceProvider().GetRequiredService<IUserConfirmation<PocoUser>>() as MyUserConfirmation;
+            Assert.NotNull(thingy);
+        }
+
         [Fact]
         public void CanOverrideRoleValidator()
         {
@@ -356,5 +372,9 @@ namespace Microsoft.AspNetCore.Identity.Test
 
             }
         }
+
+        private class MyUserConfirmation : DefaultUserConfirmation<PocoUser>
+        {
+        }
     }
 }