feat: 인증번호 재설정 이메일 발송 시 전송 횟수 제한 기능 추가 (#430)

* feat: 인증번호 재설정 이메일 발송 시 rate limiter 로직 추가

* test: 인증번호 재설정 이메일 발송 시 rate limiter 로직 테스트 케이스 추가

* refactor: EmailAuthService import문 정리

Author: 023-dev

src/main/java/org/ject/support/external/email/service/EmailAuthService.java

@@ -1,17 +1,15 @@
 package org.ject.support.external.email.service;
 
+import java.time.Duration;
+import java.util.Map;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.ject.support.common.util.CodeGeneratorUtil;
 import org.ject.support.external.email.domain.EmailTemplate;
-import org.ject.support.external.email.exception.EmailErrorCode;
 import org.ject.support.external.email.exception.RateLimitException;
 import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.stereotype.Service;
 
-import java.time.Duration;
-import java.util.Map;
-
 @Slf4j
 @Service
 @RequiredArgsConstructor
@@ -34,7 +32,7 @@ public void sendAuthCode(EmailTemplate sendGroupCode, String toEmail) {
     }
 
     private void checkRateLimit(EmailTemplate sendGroupCode, String toEmail) {
-        if (sendGroupCode != EmailTemplate.AUTH_CODE) {
+        if (sendGroupCode == EmailTemplate.REMIND_APPLY) {
             return;
         }
 

src/test/java/org/ject/support/external/email/service/EmailAuthServiceTest.java

@@ -51,6 +51,25 @@ class EmailAuthServiceTest extends UnitTestSupport {
         verify(emailSendService).sendTemplatedEmail(eq(EmailTemplate.AUTH_CODE), eq(email), any());
     }
 
+    @Test
+    void 인증번호_재설정_시_Rate_Limit이_적용되어_있지_않다면_정상_발송된다() {
+        // given
+        String email = "test@example.com";
+
+        given(redisTemplate.hasKey(anyString())).willReturn(false);
+        given(redisTemplate.opsForValue()).willReturn(valueOperations);
+
+        // when
+        emailAuthService.sendAuthCode(EmailTemplate.PIN_RESET, email);
+
+        // then
+        // 1. Rate Limit 키가 설정되었는지 검증 (3분)
+        verify(valueOperations).set(eq("email:rate_limit:" + email), eq("1"), eq(Duration.ofMinutes(3)));
+        // 2. 이메일 발송이 호출되었는지 검증
+        verify(emailSendService).sendTemplatedEmail(eq(EmailTemplate.PIN_RESET), eq(email), any());
+    }
+
+
     @Test
     void _3분_내에_재요청_시_RateLimitException이_발생한다() {
         // given
@@ -69,19 +88,19 @@ class EmailAuthServiceTest extends UnitTestSupport {
     }
 
     @Test
-    void PIN_재설정_메일은_Rate_Limit_영향을_받지_않는다() {
+    void 리마인더_메일은_Rate_Limit_영향을_받지_않는다() {
         // given
         String email = "test@example.com";
         given(redisTemplate.opsForValue()).willReturn(valueOperations);
 
         // when
-        emailAuthService.sendAuthCode(EmailTemplate.PIN_RESET, email);
+        emailAuthService.sendAuthCode(EmailTemplate.REMIND_APPLY, email);
 
         // then
         // Rate Limit 체크(hasKey)를 하지 않아야 함
         verify(redisTemplate, never()).hasKey(anyString());
 
         // 이메일 발송은 정상 호출
-        verify(emailSendService).sendTemplatedEmail(eq(EmailTemplate.PIN_RESET), eq(email), any());
+        verify(emailSendService).sendTemplatedEmail(eq(EmailTemplate.REMIND_APPLY), eq(email), any());
     }
 }