Initial commit

MealPlan.Api/Services/IRefreshTokenStore.cs

@@ -0,0 +1,20 @@
+using MealPlan.Api.Models;
+
+namespace MealPlan.Api.Services;
+
+/// <summary>
+/// Stores issued refresh tokens. Backed by an in-memory implementation because the
+/// existing database schema must not be modified and no migrations may be added.
+/// </summary>
+public interface IRefreshTokenStore
+{
+    void Add(RefreshToken token);
+
+    RefreshToken? Get(string token);
+
+    /// <summary>Marks a token revoked. Returns the revoked token if it existed and was active.</summary>
+    RefreshToken? Revoke(string token);
+
+    /// <summary>Removes expired/revoked tokens to bound memory usage.</summary>
+    void RemoveExpired();
+}