feat/member-email-verify-1: 이메일 인증 로직 추가

- 이메일 인증번호 생성 : POST, Body로 email 전송, redis로 3분 유효 캐시인 인증코드 생성 (약 5초 정도 걸림)
- 인증번호 검증 : GET, Param으로 email, verifyCode로 캐시값에서 키 값 가져와 유효성 검증

src/main/java/com/dife/api/config/SecurityConfig.java

@@ -49,6 +49,7 @@ public SecurityFilterChain filterChain(HttpSecurity httpSecurity) throws Excepti
 											"/favicon.ico",
 											"/api/v1/api-docs/**",
 											"/api/members/register",
+											"/api/members/email",
 											"/api/members/check/**",
 											"/api/members/refresh-token",
 											"/api/members/change-password",

src/main/java/com/dife/api/controller/MemberController.java

@@ -29,6 +29,23 @@ public class MemberController implements SwaggerMemberController {
 	private final MemberService memberService;
 	private final JWTUtil jwtUtil;
 
+	@PostMapping("/email")
+	public ResponseEntity<RegisterResponseDto> checkEmail(@Valid @RequestBody CheckEmailDto dto) {
+
+		memberService.checkEmail(dto);
+
+		return ResponseEntity.ok().build();
+	}
+
+	@GetMapping("/email")
+	public ResponseEntity<RegisterResponseDto> verifyEmail(
+			@RequestParam(name = "email", required = false) String email,
+			@RequestParam(name = "verifyCode", required = false) String verifyCode) {
+		memberService.verifyEmail(email, verifyCode);
+
+		return ResponseEntity.ok().build();
+	}
+
 	@PostMapping("/register")
 	public ResponseEntity<RegisterResponseDto> registerEmailAndPassword(
 			@Valid @RequestBody RegisterEmailAndPasswordRequestDto dto) {

src/main/java/com/dife/api/jwt/JWTFilter.java

@@ -76,6 +76,7 @@ protected void doFilterInternal(
 
 	private boolean isExemptPath(String servletPath) {
 		return servletPath.startsWith("/api/members/register")
+				|| servletPath.equals("/api/members/email")
 				|| servletPath.equals("/api/members/change-password")
 				|| servletPath.equals("/api/members/login")
 				|| servletPath.equals("/health")

src/main/java/com/dife/api/model/dto/CheckEmailDto.java

@@ -0,0 +1,13 @@
+package com.dife.api.model.dto;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
+
+@Getter
+@Setter
+@RequiredArgsConstructor
+public class CheckEmailDto {
+
+	private String email;
+}

src/main/java/com/dife/api/model/dto/VerifyEmailDto.java

@@ -0,0 +1,14 @@
+package com.dife.api.model.dto;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
+
+@Getter
+@Setter
+@RequiredArgsConstructor
+public class VerifyEmailDto {
+
+	private String email;
+	private String verifyCode;
+}

src/main/java/com/dife/api/redis/RedisUtil.java

@@ -0,0 +1,34 @@
+package com.dife.api.redis;
+
+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.Component;
+
+@Component
+@RequiredArgsConstructor
+public class RedisUtil {
+
+	private final StringRedisTemplate stringRedisTemplate;
+
+	public String getData(String key) {
+		ValueOperations<String, String> valueOperations = stringRedisTemplate.opsForValue();
+		return valueOperations.get(key);
+	}
+
+	public void setData(String key, String value) {
+		ValueOperations<String, String> valueOperations = stringRedisTemplate.opsForValue();
+		valueOperations.set(key, value);
+	}
+
+	public void setDataExpire(String key, String value, long duration) {
+		ValueOperations<String, String> valueOperations = stringRedisTemplate.opsForValue();
+		Duration expireDuration = Duration.ofSeconds(duration);
+		valueOperations.set(key, value, expireDuration);
+	}
+
+	public void deleteData(String key) {
+		stringRedisTemplate.delete(key);
+	}
+}

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

@@ -8,6 +8,7 @@
 import com.dife.api.jwt.JWTUtil;
 import com.dife.api.model.*;
 import com.dife.api.model.dto.*;
+import com.dife.api.redis.RedisUtil;
 import com.dife.api.repository.*;
 import java.util.*;
 import java.util.function.Function;
@@ -72,6 +73,36 @@ public class MemberService {
 	private static final long ACCESS_TOKEN_VALIDITY_DURATION = 60 * 60 * 1000L;
 	private static final long REFRESH_TOKEN_VALIDITY_DURATION = 90 * 24 * 60 * 60 * 1000L;
 
+	private final RedisUtil redisUtil;
+
+	public void checkEmail(CheckEmailDto dto) {
+		String email = dto.getEmail();
+
+		if (memberRepository.existsByEmail(email))
+			throw new DuplicateMemberException("이미 가입되어있는 이메일입니다");
+
+		Random random = new Random();
+		String verifyCode = String.format("%04d", random.nextInt(10000));
+		SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
+		simpleMailMessage.setTo(email);
+		simpleMailMessage.setSubject("🤿 DIFE 이메일 인증 🤿");
+		simpleMailMessage.setText(
+				"이메일 인증을 위해 아래 인증번호를 부여해드립니다!\n" + "회원가입 페이지로 돌아가 주세요!" + "인증번호 : " + verifyCode + "\n");
+		javaMailSender.send(simpleMailMessage);
+		redisUtil.setDataExpire(email, verifyCode, 60 * 3L);
+	}
+
+	public void verifyEmail(String email, String verifyCode) {
+		String storedVerifyCode = redisUtil.getData(email);
+
+		if (storedVerifyCode == null) {
+			throw new MemberNullException("인증번호가 만료되었거나 존재하지 않습니다.");
+		}
+		if (!storedVerifyCode.equals(verifyCode)) {
+			throw new MemberNullException("인증번호가 일치하지 않습니다!");
+		}
+	}
+
 	public RegisterResponseDto registerEmailAndPassword(RegisterEmailAndPasswordRequestDto dto) {
 
 		registerValidator.registerValidate(dto.getEmail(), dto.getPassword());