[PM-25415] move files into better place for code ownership (#6275)

* chore: move files into better place for code ownership

* fix: import correct namespace

src/Core/Auth/IdentityServer/DistributedCacheTicketStore.cs

@@ -0,0 +1,66 @@
+// FIXME: Update this file to be null safe and then delete the line below
+#nullable disable
+
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.Authentication.Cookies;
+using Microsoft.Extensions.Caching.Distributed;
+
+namespace Bit.Core.Auth.IdentityServer;
+
+public class DistributedCacheTicketStore : ITicketStore
+{
+    private const string KeyPrefix = "auth-";
+    private readonly IDistributedCache _cache;
+
+    public DistributedCacheTicketStore(IDistributedCache distributedCache)
+    {
+        _cache = distributedCache;
+    }
+
+    public async Task<string> StoreAsync(AuthenticationTicket ticket)
+    {
+        var key = $"{KeyPrefix}{Guid.NewGuid()}";
+        await RenewAsync(key, ticket);
+
+        return key;
+    }
+
+    public Task RenewAsync(string key, AuthenticationTicket ticket)
+    {
+        var options = new DistributedCacheEntryOptions();
+        var expiresUtc = ticket.Properties.ExpiresUtc ??
+            DateTimeOffset.UtcNow.AddMinutes(15);
+        options.SetAbsoluteExpiration(expiresUtc);
+
+        var val = SerializeToBytes(ticket);
+        _cache.Set(key, val, options);
+
+        return Task.FromResult(0);
+    }
+
+    public Task<AuthenticationTicket> RetrieveAsync(string key)
+    {
+        AuthenticationTicket ticket;
+        var bytes = _cache.Get(key);
+        ticket = DeserializeFromBytes(bytes);
+
+        return Task.FromResult(ticket);
+    }
+
+    public Task RemoveAsync(string key)
+    {
+        _cache.Remove(key);
+
+        return Task.FromResult(0);
+    }
+
+    private static byte[] SerializeToBytes(AuthenticationTicket source)
+    {
+        return TicketSerializer.Default.Serialize(source);
+    }
+
+    private static AuthenticationTicket DeserializeFromBytes(byte[] source)
+    {
+        return source == null ? null : TicketSerializer.Default.Deserialize(source);
+    }
+}