Add support for ReCaptcha in addition to HCaptcha (#372)

* Bump YamlDotNet from 11.2.1 to 12.0.0

Bumps [YamlDotNet](https://github.com/aaubry/YamlDotNet) from 11.2.1 to 12.0.0.
- [Release notes](https://github.com/aaubry/YamlDotNet/releases)
- [Commits](https://github.com/aaubry/YamlDotNet/compare/v11.2.1...v12.0.0)

---
updated-dependencies:
- dependency-name: YamlDotNet
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* Add support for ReCaptcha in addition to HCaptcha

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

ProjectLighthouse.Servers.Website/Pages/Partials/CaptchaPartial.cshtml

@@ -1,6 +1,17 @@
 @using LBPUnion.ProjectLighthouse.Configuration
 @if (ServerConfiguration.Instance.Captcha.CaptchaEnabled)
 {
-    <div class="h-captcha" data-sitekey="@ServerConfiguration.Instance.Captcha.SiteKey"></div>
-    <script src="https://js.hcaptcha.com/1/api.js" async defer></script>
+    @switch (ServerConfiguration.Instance.Captcha.Type)
+    {
+        case CaptchaType.HCaptcha:
+            <div class="h-captcha" data-sitekey="@ServerConfiguration.Instance.Captcha.SiteKey"></div>
+            <script src="https://js.hcaptcha.com/1/api.js" async defer></script>
+            break;
+        case CaptchaType.ReCaptcha:
+            <div class="g-recaptcha" data-sitekey="@ServerConfiguration.Instance.Captcha.SiteKey"></div>
+            <script src="https://www.google.com/recaptcha/api.js" async defer></script>
+            break;
+        default:
+            throw new ArgumentOutOfRangeException();
+    }
 }

ProjectLighthouse/Configuration/CaptchaType.cs

@@ -0,0 +1,16 @@
+namespace LBPUnion.ProjectLighthouse.Configuration;
+
+/// <summary>
+/// The service to be used for presenting captchas to the user.
+/// </summary>
+public enum CaptchaType
+{
+    /// <summary>
+    /// A privacy-first captcha. https://www.hcaptcha.com/
+    /// </summary>
+    HCaptcha,
+    /// <summary>
+    /// A captcha service by Google. https://developers.google.com/recaptcha/
+    /// </summary>
+    ReCaptcha,
+}

ProjectLighthouse/Configuration/ConfigurationCategories/CaptchaConfiguration.cs

@@ -2,11 +2,10 @@ namespace LBPUnion.ProjectLighthouse.Configuration.ConfigurationCategories;
 
 public class CaptchaConfiguration
 {
-    // TODO: support recaptcha, not just hcaptcha
-    // use an enum to define which captcha services can be used?
-    // LBPUnion.ProjectLighthouse.Types.Settings.CaptchaService
     public bool CaptchaEnabled { get; set; }
 
+    public CaptchaType Type { get; set; } = CaptchaType.HCaptcha;
+
     public string SiteKey { get; set; } = "";
 
     public string Secret { get; set; } = "";

ProjectLighthouse/Configuration/ServerConfiguration.cs

@@ -23,7 +23,7 @@ public class ServerConfiguration
     // You can use an ObsoleteAttribute instead. Make sure you set it to error, though.
     //
     // Thanks for listening~
-    public const int CurrentConfigVersion = 6;
+    public const int CurrentConfigVersion = 7;
 
     #region Meta
 

ProjectLighthouse/Extensions/RequestExtensions.cs

@@ -15,7 +15,21 @@ namespace LBPUnion.ProjectLighthouse.Extensions;
 
 public static class RequestExtensions
 {
-
+    static RequestExtensions()
+    {
+        Uri captchaUri = ServerConfiguration.Instance.Captcha.Type switch
+        {
+            CaptchaType.HCaptcha => new Uri("https://hcaptcha.com"),
+            CaptchaType.ReCaptcha => new Uri("https://www.google.com/recaptcha/api/"),
+            _ => throw new ArgumentOutOfRangeException(),
+        };
+        
+        client = new HttpClient
+        {
+            BaseAddress = captchaUri,
+        };
+    }
+    
     #region Mobile Checking
 
     // yoinked and adapted from https://stackoverflow.com/a/68641796
@@ -32,10 +46,7 @@ public static class RequestExtensions
 
     #region Captcha
 
-    private static readonly HttpClient client = new()
-    {
-        BaseAddress = new Uri("https://hcaptcha.com"),
-    };
+    private static readonly HttpClient client;
 
     [SuppressMessage("ReSharper", "ArrangeObjectCreationWhenTypeNotEvident")]
     private static async Task<bool> verifyCaptcha(string token)
@@ -48,7 +59,7 @@ public static class RequestExtensions
             new("response", token),
         };
 
-        HttpResponseMessage response = await client.PostAsync("/siteverify", new FormUrlEncodedContent(payload));
+        HttpResponseMessage response = await client.PostAsync("siteverify", new FormUrlEncodedContent(payload));
 
         response.EnsureSuccessStatusCode();
 
@@ -63,7 +74,14 @@ public static class RequestExtensions
     {
         if (ServerConfiguration.Instance.Captcha.CaptchaEnabled)
         {
-            bool gotCaptcha = request.Form.TryGetValue("h-captcha-response", out StringValues values);
+            string keyName = ServerConfiguration.Instance.Captcha.Type switch
+            {
+                CaptchaType.HCaptcha => "h-captcha-response",
+                CaptchaType.ReCaptcha => "g-recaptcha-response",
+                _ => throw new ArgumentOutOfRangeException(),
+            };
+            
+            bool gotCaptcha = request.Form.TryGetValue(keyName, out StringValues values);
             if (!gotCaptcha) return false;
 
             if (!await verifyCaptcha(values[0])) return false;