Share captcha validation policy

Directory.Packages.props

@@ -62,5 +62,6 @@
     <PackageVersion Include="OpenTelemetry.Instrumentation.Runtime" Version="1.15.1" />
     <PackageVersion Include="OpenTelemetry.Instrumentation.SqlClient" Version="1.15.2" />
     <PackageVersion Include="DotnetSitemapGenerator" Version="2.0.0" />
+    <PackageVersion Include="OpenAI" Version="2.10.0" />
   </ItemGroup>
 </Project>

EssentialCSharp.Chat.Shared/EssentialCSharp.Chat.Common.csproj

@@ -12,6 +12,7 @@
     <PackageReference Include="Microsoft.Extensions.Http.Resilience" />
     <PackageReference Include="ModelContextProtocol" />
     <PackageReference Include="ModelContextProtocol.AspNetCore" />
+    <PackageReference Include="OpenAI" />
     <PackageReference Include="Microsoft.SourceLink.GitHub">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

EssentialCSharp.Chat.Shared/Extensions/ServiceCollectionExtensions.cs

@@ -6,7 +6,6 @@
 using Microsoft.Extensions.AI;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Http.Resilience;
 using Microsoft.Extensions.Options;
 using Microsoft.SemanticKernel;
 using Npgsql;

EssentialCSharp.Web.Tests/CaptchaValidationServiceTests.cs

@@ -0,0 +1,118 @@
+using EssentialCSharp.Web.Models;
+using EssentialCSharp.Web.Services;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+
+namespace EssentialCSharp.Web.Tests;
+
+public class CaptchaValidationServiceTests
+{
+    [Test]
+    public async Task ValidateAsync_MissingConfig_RejectsWithoutVerification()
+    {
+        StubCaptchaService captchaService = new((_, _, _) => throw new InvalidOperationException("Verifier should not be called."));
+        using ServiceProvider serviceProvider = CreateServiceProvider(
+            new CaptchaOptions { SecretKey = string.Empty, SiteKey = string.Empty },
+            captchaService);
+
+        ICaptchaValidationService validationService = serviceProvider.GetRequiredService<ICaptchaValidationService>();
+
+        CaptchaValidationResult result = await validationService.ValidateAsync("token", "127.0.0.1");
+
+        await Assert.That(result.Outcome).IsEqualTo(CaptchaValidationOutcome.Disabled);
+        await Assert.That(result.ShouldProceed).IsFalse();
+        await Assert.That(captchaService.CallCount).IsEqualTo(0);
+    }
+
+    [Test]
+    public async Task ValidateAsync_MissingToken_ReturnsMissingToken()
+    {
+        StubCaptchaService captchaService = new((_, _, _) => throw new InvalidOperationException("Verifier should not be called."));
+        using ServiceProvider serviceProvider = CreateServiceProvider(
+            new CaptchaOptions { SecretKey = "secret", SiteKey = "sitekey" },
+            captchaService);
+
+        ICaptchaValidationService validationService = serviceProvider.GetRequiredService<ICaptchaValidationService>();
+
+        CaptchaValidationResult result = await validationService.ValidateAsync(string.Empty, "127.0.0.1");
+
+        await Assert.That(result.Outcome).IsEqualTo(CaptchaValidationOutcome.MissingToken);
+        await Assert.That(result.ShouldProceed).IsFalse();
+        await Assert.That(captchaService.CallCount).IsEqualTo(0);
+    }
+
+    [Test]
+    public async Task ValidateAsync_Unavailable_ReturnsUnavailable()
+    {
+        StubCaptchaService captchaService = new((_, _, _) => Task.FromResult<HCaptchaResult?>(null));
+        using ServiceProvider serviceProvider = CreateServiceProvider(
+            new CaptchaOptions { SecretKey = "secret", SiteKey = "sitekey" },
+            captchaService);
+
+        ICaptchaValidationService validationService = serviceProvider.GetRequiredService<ICaptchaValidationService>();
+
+        CaptchaValidationResult result = await validationService.ValidateAsync("token", "127.0.0.1");
+
+        await Assert.That(result.Outcome).IsEqualTo(CaptchaValidationOutcome.Unavailable);
+        await Assert.That(result.ShouldProceed).IsFalse();
+        await Assert.That(captchaService.CallCount).IsEqualTo(1);
+    }
+
+    [Test]
+    public async Task ValidateAsync_InvalidAndValid_ReturnExpectedOutcome()
+    {
+        StubCaptchaService invalidCaptchaService = new((_, _, _) => Task.FromResult<HCaptchaResult?>(new HCaptchaResult
+        {
+            Success = false,
+            ErrorCodes = ["invalid-input-response"]
+        }));
+        using ServiceProvider invalidProvider = CreateServiceProvider(
+            new CaptchaOptions { SecretKey = "secret", SiteKey = "sitekey" },
+            invalidCaptchaService);
+
+        ICaptchaValidationService invalidValidationService = invalidProvider.GetRequiredService<ICaptchaValidationService>();
+        CaptchaValidationResult invalidResult = await invalidValidationService.ValidateAsync("token", "127.0.0.1");
+
+        await Assert.That(invalidResult.Outcome).IsEqualTo(CaptchaValidationOutcome.Invalid);
+        await Assert.That(invalidResult.Response).IsNotNull();
+        await Assert.That(invalidResult.ShouldProceed).IsFalse();
+
+        StubCaptchaService validCaptchaService = new((_, _, _) => Task.FromResult<HCaptchaResult?>(new HCaptchaResult
+        {
+            Success = true
+        }));
+        using ServiceProvider validProvider = CreateServiceProvider(
+            new CaptchaOptions { SecretKey = "secret", SiteKey = "sitekey" },
+            validCaptchaService);
+
+        ICaptchaValidationService validValidationService = validProvider.GetRequiredService<ICaptchaValidationService>();
+        CaptchaValidationResult validResult = await validValidationService.ValidateAsync("token", "127.0.0.1");
+
+        await Assert.That(validResult.Outcome).IsEqualTo(CaptchaValidationOutcome.Valid);
+        await Assert.That(validResult.ShouldProceed).IsTrue();
+        await Assert.That(validCaptchaService.CallCount).IsEqualTo(1);
+    }
+
+    private static ServiceProvider CreateServiceProvider(CaptchaOptions options, ICaptchaService captchaService)
+    {
+        ServiceCollection services = new();
+        services.AddSingleton(Options.Create(options));
+        services.AddSingleton(captchaService);
+        services.AddSingleton<ICaptchaValidationService, CaptchaValidationService>();
+        return services.BuildServiceProvider();
+    }
+
+    private sealed class StubCaptchaService(Func<string?, string?, CancellationToken, Task<HCaptchaResult?>> verifyAsync) : ICaptchaService
+    {
+        public int CallCount { get; private set; }
+
+        public Task<HCaptchaResult?> VerifyAsync(string? response, CancellationToken cancellationToken = default)
+            => VerifyAsync(response, remoteIp: null, cancellationToken);
+
+        public async Task<HCaptchaResult?> VerifyAsync(string? response, string? remoteIp, CancellationToken cancellationToken = default)
+        {
+            CallCount++;
+            return await verifyAsync(response, remoteIp, cancellationToken);
+        }
+    }
+}

EssentialCSharp.Web/Areas/Identity/Pages/Account/ForgotPassword.cshtml.cs

@@ -1,8 +1,7 @@
-using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations;
 using System.Text;
 using System.Text.Encodings.Web;
 using EssentialCSharp.Web.Areas.Identity.Data;
-using EssentialCSharp.Web.Models;
 using EssentialCSharp.Web.Services;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.AspNetCore.Identity.UI.Services;
@@ -13,7 +12,7 @@
 
 namespace EssentialCSharp.Web.Areas.Identity.Pages.Account;
 
-public class ForgotPasswordModel(UserManager<EssentialCSharpWebUser> userManager, IEmailSender emailSender, ICaptchaService captchaService, IOptions<CaptchaOptions> optionsAccessor) : PageModel
+public class ForgotPasswordModel(UserManager<EssentialCSharpWebUser> userManager, IEmailSender emailSender, ICaptchaValidationService captchaValidationService, IOptions<CaptchaOptions> optionsAccessor) : PageModel
 {
     private InputModel? _Input;
     [BindProperty]
@@ -36,8 +35,8 @@ public class InputModel
     public async Task<IActionResult> OnPostAsync()
     {
         string? captchaToken = Request.Form[CaptchaOptions.HttpPostResponseKeyName];
-        HCaptchaResult? captchaResult = await captchaService.VerifyAsync(captchaToken, HttpContext.Connection.RemoteIpAddress?.ToString());
-        if (captchaResult?.Success != true)
+        CaptchaValidationResult captchaResult = await captchaValidationService.ValidateAsync(captchaToken, HttpContext.Connection.RemoteIpAddress?.ToString());
+        if (!captchaResult.ShouldProceed)
         {
             ModelState.AddModelError(string.Empty, "Human verification failed. Please try again.");
             return Page();

EssentialCSharp.Web/Areas/Identity/Pages/Account/Login.cshtml.cs

@@ -1,6 +1,5 @@
 using System.ComponentModel.DataAnnotations;
 using EssentialCSharp.Web.Areas.Identity.Data;
-using EssentialCSharp.Web.Models;
 using EssentialCSharp.Web.Services;
 using EssentialCSharp.Web.Services.Referrals;
 using Microsoft.AspNetCore.Authentication;
@@ -11,7 +10,7 @@
 
 namespace EssentialCSharp.Web.Areas.Identity.Pages.Account;
 
-public partial class LoginModel(SignInManager<EssentialCSharpWebUser> signInManager, UserManager<EssentialCSharpWebUser> userManager, ILogger<LoginModel> logger, IReferralService referralService, ICaptchaService captchaService, IOptions<CaptchaOptions> optionsAccessor) : PageModel
+public partial class LoginModel(SignInManager<EssentialCSharpWebUser> signInManager, UserManager<EssentialCSharpWebUser> userManager, ILogger<LoginModel> logger, IReferralService referralService, ICaptchaValidationService captchaValidationService, IOptions<CaptchaOptions> optionsAccessor) : PageModel
 {
     private InputModel? _Input;
     [BindProperty]
@@ -68,10 +67,8 @@ public async Task<IActionResult> OnPostAsync(string? returnUrl = null)
         returnUrl ??= Url.Content("~/");
 
         string? captchaToken = Request.Form[CaptchaOptions.HttpPostResponseKeyName];
-
-        HCaptchaResult? captchaResult = await captchaService.VerifyAsync(captchaToken, HttpContext.Connection.RemoteIpAddress?.ToString());
-
-        if (captchaResult?.Success != true)
+        CaptchaValidationResult captchaResult = await captchaValidationService.ValidateAsync(captchaToken, HttpContext.Connection.RemoteIpAddress?.ToString());
+        if (!captchaResult.ShouldProceed)
         {
             ModelState.AddModelError(string.Empty, "Human verification failed. Please try again.");
             ExternalLogins = (await signInManager.GetExternalAuthenticationSchemesAsync()).ToList();