Add serverUrl to OAuthProviderInfo

docs/API.dox

@@ -128,7 +128,7 @@ TGS4 supports OAuth 2.0 with select providers for authentication.
 
 The flow for this is as follows:
 
-- Retrieve the @ref api_ver to find out available OAuth providers and their respective client ID and redirect URIs.
+- Retrieve the @ref api_ver to find out which @ref Tgstation.Server.Api.Models.OAuthProvider are enabled and their respective information.
 - Send the user to the Authorization Request endpoint for the provider using the client ID from above. See https://tools.ietf.org/html/rfc6749#section-4.1.1. DO NOT specify a redirect URI, this should be configured in the provider.
 - Retrieve the authorization response code after successfully completing the authorize step above.
 - Perform the following request:

src/Tgstation.Server.Api/Models/OAuthProviderInfo.cs

@@ -16,5 +16,10 @@ namespace Tgstation.Server.Api.Models
 		/// The redirect URL.
 		/// </summary>
 		public Uri? RedirectUri { get; set; }
+
+		/// <summary>
+		/// The server URL.
+		/// </summary>
+		public Uri? ServerUrl { get; set; }
 	}
 }

src/Tgstation.Server.Host/Security/OAuth/GenericOAuthValidator.cs

@@ -127,7 +127,8 @@ namespace Tgstation.Server.Host.Security.OAuth
 			new OAuthProviderInfo
 			{
 				ClientId = OAuthConfiguration.ClientId,
-				RedirectUri = OAuthConfiguration.RedirectUrl
+				RedirectUri = OAuthConfiguration.RedirectUrl,
+				ServerUrl = OAuthConfiguration.ServerUrl
 			});
 	}
 }