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diff --git a/src/auth.rs b/src/auth.rs
index 1234567..abcdefg 100644
--- a/src/auth.rs
+++ b/src/auth.rs
@@ -10,6 +10,25 @@ use crate::models::User;
 pub struct AuthService {
     secret_key: String,
+    token_expiry: u64,
+}
+
+impl AuthService {
+    pub fn validate_token(&self, token: &str) -> Result<User, AuthError> {
+        let decoded = decode::<Claims>(
+            token,
+            &DecodingKey::from_secret(self.secret_key.as_bytes()),
+            &Validation::default(),
+        )?;
+        
+        if decoded.claims.exp < current_timestamp() {
+            return Err(AuthError::TokenExpired);
+        }
+        
+        User::find_by_id(decoded.claims.sub)
+            .ok_or(AuthError::UserNotFound)
+    }
 }