jwt 소스 추가

src/main/java/com/kamco/cd/kamcoback/auth/RefreshTokenService.java

@@ -0,0 +1,29 @@
+package com.kamco.cd.kamcoback.auth;
+
+import java.time.Duration;
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.data.redis.core.ValueOperations;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class RefreshTokenService {
+
+  private final StringRedisTemplate redisTemplate;
+  private static final String PREFIX = "RT:";
+
+  public void save(String username, String refreshToken, long ttlMillis) {
+    ValueOperations<String, String> ops = redisTemplate.opsForValue();
+    ops.set(PREFIX + username, refreshToken, Duration.ofMillis(ttlMillis));
+  }
+
+  public boolean validate(String username, String refreshToken) {
+    String stored = redisTemplate.opsForValue().get(PREFIX + username);
+    return stored != null && stored.equals(refreshToken);
+  }
+
+  public void delete(String username) {
+    redisTemplate.delete(PREFIX + username);
+  }
+}