add a bunch of stuff copied from Foxchat.NET

Foxnouns.Backend/Database/Models/Application.cs

@@ -0,0 +1,40 @@
+using System.Security.Cryptography;
+using Foxnouns.Backend.Utils;
+
+namespace Foxnouns.Backend.Database.Models;
+
+public class Application : BaseModel
+{
+    public required string ClientId { get; init; }
+    public required string ClientSecret { get; init; }
+    public required string Name { get; init; }
+    public required string[] Scopes { get; init; }
+    public required string[] RedirectUris { get; set; }
+
+    public static Application Create(ISnowflakeGenerator snowflakeGenerator, string name, string[] scopes,
+        string[] redirectUrls)
+    {
+        var clientId = RandomNumberGenerator.GetHexString(32, true);
+        var clientSecret = OauthUtils.RandomToken(48);
+
+        if (scopes.Except(OauthUtils.ApplicationScopes).Any())
+        {
+            throw new ArgumentException("Invalid scopes passed to Application.Create", nameof(scopes));
+        }
+
+        if (redirectUrls.Any(s => !OauthUtils.ValidateRedirectUri(s)))
+        {
+            throw new ArgumentException("Invalid redirect URLs passed to Application.Create", nameof(redirectUrls));
+        }
+
+        return new Application
+        {
+            Id = snowflakeGenerator.GenerateSnowflake(),
+            ClientId = clientId,
+            ClientSecret = clientSecret,
+            Name = name,
+            Scopes = scopes,
+            RedirectUris = redirectUrls
+        };
+    }
+}