From 74e6bd83dc91b1453b34f012a2383f54e4f85f25 Mon Sep 17 00:00:00 2001
From: SEAN <seonkyu.kim@ta9.co.kr>
Date: Wed, 11 Feb 2026 11:20:16 +0900
Subject: [PATCH] =?UTF-8?q?improvement:=20InMemoryTokenStore=EB=A5=BC=20Re?=
 =?UTF-8?q?dis=20=EA=B8=B0=EB=B0=98=EC=9C=BC=EB=A1=9C=20=EA=B5=90=EC=B2=B4?=
 =?UTF-8?q?=20(#162)?=
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- RedisTokenStore 구현 (ITokenStore, Redis StringSet/Get/KeyDelete)
- DI 등록 변경 (InMemoryTokenStore → RedisTokenStore)
- AddMemoryCache() 제거 (더 이상 사용처 없음)

Closes #162
---
 .../Caching/RedisTokenStore.cs                | 68 +++++++++++++++++++
 SPMS.Infrastructure/DependencyInjection.cs    |  3 +-
 2 files changed, 69 insertions(+), 2 deletions(-)
 create mode 100644 SPMS.Infrastructure/Caching/RedisTokenStore.cs

diff --git a/SPMS.Infrastructure/Caching/RedisTokenStore.cs b/SPMS.Infrastructure/Caching/RedisTokenStore.cs
new file mode 100644
index 0000000..5a65d1c
--- /dev/null
+++ b/SPMS.Infrastructure/Caching/RedisTokenStore.cs
@@ -0,0 +1,68 @@
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using SPMS.Application.Interfaces;
+using SPMS.Application.Settings;
+
+namespace SPMS.Infrastructure.Caching;
+
+public class RedisTokenStore : ITokenStore
+{
+    private readonly RedisConnection _redis;
+    private readonly RedisSettings _settings;
+    private readonly ILogger<RedisTokenStore> _logger;
+
+    public RedisTokenStore(
+        RedisConnection redis,
+        IOptions<RedisSettings> settings,
+        ILogger<RedisTokenStore> logger)
+    {
+        _redis = redis;
+        _settings = settings.Value;
+        _logger = logger;
+    }
+
+    public async Task StoreAsync(string key, string value, TimeSpan expiry)
+    {
+        try
+        {
+            var db = await _redis.GetDatabaseAsync();
+            await db.StringSetAsync(BuildKey(key), value, expiry);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "토큰 저장 실패: key={Key}", key);
+            throw;
+        }
+    }
+
+    public async Task<string?> GetAsync(string key)
+    {
+        try
+        {
+            var db = await _redis.GetDatabaseAsync();
+            var value = await db.StringGetAsync(BuildKey(key));
+            return value.IsNullOrEmpty ? null : value.ToString();
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "토큰 조회 실패: key={Key}", key);
+            throw;
+        }
+    }
+
+    public async Task RemoveAsync(string key)
+    {
+        try
+        {
+            var db = await _redis.GetDatabaseAsync();
+            await db.KeyDeleteAsync(BuildKey(key));
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "토큰 삭제 실패: key={Key}", key);
+            throw;
+        }
+    }
+
+    private string BuildKey(string key) => $"{_settings.InstanceName}token:{key}";
+}
diff --git a/SPMS.Infrastructure/DependencyInjection.cs b/SPMS.Infrastructure/DependencyInjection.cs
index d05fb29..81e109c 100644
--- a/SPMS.Infrastructure/DependencyInjection.cs
+++ b/SPMS.Infrastructure/DependencyInjection.cs
@@ -88,8 +88,7 @@ public static class DependencyInjection
         services.AddHostedService<DataRetentionWorker>();
 
         // Token Store & Email Service
-        services.AddMemoryCache();
-        services.AddSingleton<ITokenStore, InMemoryTokenStore>();
+        services.AddSingleton<ITokenStore, RedisTokenStore>();
         services.AddSingleton<IEmailService, ConsoleEmailService>();
 
         return services;