feat/member-email-verify-2: 전송 보내고나서는 인증번호 자동으로 삭제되도록 (#329)

src/main/java/com/dife/api/service/MemberService.java

@@ -76,11 +76,16 @@ public class MemberService {
 	private final RedisUtil redisUtil;
 
 	public void checkEmail(CheckEmailDto dto) {
-		String email = dto.getEmail();
+		String email = dto.getEmail().trim();
 
 		if (memberRepository.existsByEmail(email))
 			throw new DuplicateMemberException("이미 가입되어있는 이메일입니다");
 
+		String previousVerifyCode = redisUtil.getData(email);
+		if (previousVerifyCode != null) {
+			redisUtil.deleteData(email);
+		}
+
 		Random random = new Random();
 		String verifyCode = String.format("%04d", random.nextInt(10000));
 		SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
@@ -93,12 +98,13 @@ public void checkEmail(CheckEmailDto dto) {
 	}
 
 	public void verifyEmail(String email, String verifyCode) {
-		String storedVerifyCode = redisUtil.getData(email);
+		String storedVerifyCode = redisUtil.getData(email.trim());
+		String trimmedVerifyCode = verifyCode.trim();
 
 		if (storedVerifyCode == null) {
 			throw new MemberNullException("인증번호가 만료되었거나 존재하지 않습니다.");
 		}
-		if (!storedVerifyCode.equals(verifyCode)) {
+		if (!storedVerifyCode.equals(trimmedVerifyCode)) {
 			throw new MemberNullException("인증번호가 일치하지 않습니다!");
 		}
 	}