Feat #60 이메일 인증 코드 발송

build.gradle

@@ -23,6 +23,7 @@ dependencies {
 	implementation 'org.springframework.boot:spring-boot-starter-web'
 	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
 	implementation 'org.springframework.boot:spring-boot-starter-validation'
+	implementation 'org.springframework.boot:spring-boot-starter-mail'
 
 	// Actuator
 	implementation 'org.springframework.boot:spring-boot-starter-actuator'

src/main/java/plango/auth/application/dto/response/SendLoginIdVerificationCodeResponse.java

@@ -2,19 +2,16 @@
 
 public record SendLoginIdVerificationCodeResponse(
         String email,
-        String maskedEmail,
-        String verificationCode
+        String maskedEmail
 ) {
 
     public static SendLoginIdVerificationCodeResponse of(
             String email,
-            String maskedEmail,
-            String verificationCode
+            String maskedEmail
     ) {
         return new SendLoginIdVerificationCodeResponse(
                 email,
-                maskedEmail,
-                verificationCode
+                maskedEmail
         );
     }
 }

src/main/java/plango/auth/application/usecase/SendLoginIdVerificationCodeUseCase.java

@@ -24,13 +24,12 @@ public SendLoginIdVerificationCodeResponse execute(FindLoginIdRequest request) {
         Member member = memberService.findByEmail(request.email())
                 .orElseThrow(() -> new MemberException(MemberErrorCode.MEMBER_NOT_FOUND));
 
-        String code = emailVerificationService.createAndSendVerificationCode(member.getEmail());
+        emailVerificationService.createAndSendVerificationCode(member.getEmail());
         String maskedEmail = emailVerificationService.maskEmail(member.getEmail());
 
         return SendLoginIdVerificationCodeResponse.of(
                 member.getEmail(),
-                maskedEmail,
-                code
+                maskedEmail
         );
     }
 }

src/main/java/plango/auth/domain/service/EmailVerificationService.java

@@ -7,6 +7,9 @@
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.mail.SimpleMailMessage;
+import org.springframework.mail.javamail.JavaMailSender;
 import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Service;
 import plango.global.common.exception.BusinessException;
@@ -20,15 +23,20 @@ public class EmailVerificationService {
 
     private final Map<String, VerificationInfo> store = new ConcurrentHashMap<>();
 
-    public String createAndSendVerificationCode(String email) {
+    private final JavaMailSender mailSender;
+
+    @Value("${spring.mail.username:no-reply@plango.com}")
+    private String fromAddress;
+
+    public void createAndSendVerificationCode(String email) {
         String code = generateCode();
 
         VerificationInfo info = new VerificationInfo(code, Instant.now());
         store.put(email, info);
 
-        log.info("[EmailVerification] email = {}, code = {}", email, code);
+        sendEmail(email, code);
 
-        return code;
+        log.info("[EmailVerification] email = {}, code = {}", email, code);
     }
 
     public void verifyCode(String email, String code) {
@@ -68,6 +76,23 @@ private String generateCode() {
         return String.format("%06d", value);
     }
 
+    private void sendEmail(String email, String code) {
+        SimpleMailMessage message = new SimpleMailMessage();
+        message.setTo(email);
+        message.setSubject("[PlanGo] 아이디 찾기 인증번호 안내");
+        message.setText(buildEmailBody(code));
+        message.setFrom(fromAddress);
+
+        mailSender.send(message);
+    }
+
+    private String buildEmailBody(String code) {
+        return "안녕하세요, PlanGo 입니다.\n\n"
+                + "아이디 찾기를 위한 인증번호는 다음과 같습니다.\n\n"
+                + "인증번호: " + code + "\n\n"
+                + "본 메일은 발신 전용 메일입니다.";
+    }
+
     public String maskEmail(String email) {
         if (email == null || email.isBlank()) {
             return "";

src/main/java/plango/auth/presentation/AuthController.java

@@ -190,7 +190,7 @@ public ResponseEntity<CommonResponse<FindLoginIdPreviewResponse>> findLoginId(
 
     @Operation(
             summary = "아이디 찾기 추가 인증번호 발송",
-            description = "아이디를 찾기 위해 입력한 이메일로 6자리 인증번호를 전송합니다. 테스트 편의를 위해 응답에 인증번호가 함께 포함됩니다."
+            description = "아이디를 찾기 위해 입력한 이메일로 6자리 인증번호를 전송합니다."
     )
     @PostMapping("/find-id/send-code")
     public ResponseEntity<CommonResponse<SendLoginIdVerificationCodeResponse>> sendFindIdCode(

src/main/resources/application-dev.yml

@@ -23,6 +23,18 @@ spring:
     baseline-on-migrate: true
     baseline-version: 1
 
+  mail:
+    host: smtp.gmail.com
+    port: 587
+    username: ${MAIL_USERNAME}
+    password: ${MAIL_PASSWORD}
+    properties:
+      mail:
+        smtp:
+          auth: true
+          starttls:
+            enable: true
+
 jwt:
   key: ${JWT_KEY}                   # 반드시 .env에 설정
   access:
@@ -56,5 +68,3 @@ security:
     kakao:
       client-id: ${KAKAO_CLIENT_ID:}
       redirect-uri: ${KAKAO_REDIRECT_URI:}
-
-

src/main/resources/application-local.yml

@@ -19,6 +19,7 @@ spring:
       hibernate:
         dialect: org.hibernate.dialect.MySQLDialect
         format_sql: true
+
   flyway:
     enabled: true
     url: ${DB_URL}
@@ -28,6 +29,19 @@ spring:
     baseline-version: 1
     locations: classpath:db/migration
     out-of-order: true
+
+  mail:
+    host: smtp.gmail.com
+    port: 587
+    username: ${MAIL_USERNAME}
+    password: ${MAIL_PASSWORD}
+    properties:
+      mail:
+        smtp:
+          auth: true
+          starttls:
+            enable: true
+
 # --- 여긴 spring 밖(최상위) ---
 jwt:
   key: ${JWT_KEY}
@@ -50,7 +64,6 @@ cloud:
     stack:
       auto: false
 
-
 security:
   aes:
     key: ${AES_KEY:}
@@ -63,6 +76,7 @@ security:
   preview:
     api:
       url: ${PREVIEW_API_URL:http://localhost:3000}
+
   oauth2:
     kakao:
       client-id: ${KAKAO_CLIENT_ID}