feat: 전화번호 저장 시 암호화하여 저장

src/main/java/com/team/buddyya/common/config/ConverterConfig.java

@@ -0,0 +1,19 @@
+package com.team.buddyya.common.config;
+
+import com.team.buddyya.common.service.EncryptedConverter;
+import com.team.buddyya.common.service.EncryptionService;
+import jakarta.annotation.PostConstruct;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class ConverterConfig {
+
+    @Autowired
+    private EncryptionService encryptionService;
+
+    @PostConstruct
+    public void init() {
+        EncryptedConverter.setEncryptionService(encryptionService);
+    }
+}

src/main/java/com/team/buddyya/common/exception/CommonExceptionType.java

@@ -4,7 +4,8 @@
 
 public enum CommonExceptionType implements BaseExceptionType {
 
-    FILE_UPLOAD_ERROR(9000, HttpStatus.INTERNAL_SERVER_ERROR, "Error occurred during file upload.");
+    FILE_UPLOAD_ERROR(9000, HttpStatus.INTERNAL_SERVER_ERROR, "Error occurred during file upload."),
+    ENCRYPTION_ERROR(9001, HttpStatus.INTERNAL_SERVER_ERROR, "Encryption/Decryption error");
 
     private final int errorCode;
     private final HttpStatus httpStatus;

src/main/java/com/team/buddyya/common/service/EncryptedConverter.java

@@ -0,0 +1,30 @@
+package com.team.buddyya.common.service;
+
+import jakarta.persistence.AttributeConverter;
+import jakarta.persistence.Converter;
+
+@Converter
+public class EncryptedConverter implements AttributeConverter<String, String> {
+
+    private static EncryptionService encryptionService;
+
+    public static void setEncryptionService(EncryptionService service) {
+        EncryptedConverter.encryptionService = service;
+    }
+
+    @Override
+    public String convertToDatabaseColumn(String attribute) {
+        if (attribute == null) {
+            return null;
+        }
+        return encryptionService.encrypt(attribute);
+    }
+
+    @Override
+    public String convertToEntityAttribute(String dbData) {
+        if (dbData == null) {
+            return null;
+        }
+        return encryptionService.decrypt(dbData);
+    }
+}

src/main/java/com/team/buddyya/common/service/EncryptionService.java

@@ -0,0 +1,43 @@
+package com.team.buddyya.common.service;
+
+import com.team.buddyya.common.exception.CommonException;
+import com.team.buddyya.common.exception.CommonExceptionType;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+import javax.crypto.Cipher;
+import javax.crypto.spec.SecretKeySpec;
+import java.util.Base64;
+
+@Service
+public class EncryptionService {
+
+    @Value("${encryption.aes-key}")
+    private String secretKey;
+
+    private String ALGORITHM = "AES";
+
+    public String encrypt(String plainText) {
+        try {
+            SecretKeySpec key = new SecretKeySpec(secretKey.getBytes("UTF-8"), ALGORITHM);
+            Cipher cipher = Cipher.getInstance(ALGORITHM);
+            cipher.init(Cipher.ENCRYPT_MODE, key);
+            byte[] encrypted = cipher.doFinal(plainText.getBytes());
+            return Base64.getEncoder().encodeToString(encrypted);
+        } catch (Exception e) {
+            throw new CommonException(CommonExceptionType.ENCRYPTION_ERROR);
+        }
+    }
+
+    public String decrypt(String encryptedText) {
+        try {
+            SecretKeySpec key = new SecretKeySpec(secretKey.getBytes("UTF-8"), ALGORITHM);
+            Cipher cipher = Cipher.getInstance(ALGORITHM);
+            cipher.init(Cipher.DECRYPT_MODE, key);
+            byte[] decrypted = cipher.doFinal(Base64.getDecoder().decode(encryptedText));
+            return new String(decrypted);
+        } catch (Exception e) {
+            throw new CommonException(CommonExceptionType.ENCRYPTION_ERROR);
+        }
+    }
+}

src/main/java/com/team/buddyya/student/controller/UserController.java

@@ -44,6 +44,12 @@ public ResponseEntity<UserResponse> getMyProfile(@AuthenticationPrincipal Custom
         return ResponseEntity.ok(studentService.getUserInfo(userDetails.getStudentInfo(), userId));
     }
 
+    @GetMapping("/phoneNumber")
+    public ResponseEntity<String> getPhoneNumber(@AuthenticationPrincipal CustomUserDetails userDetails) {
+
+        return ResponseEntity.ok(studentService.getPhoneNumber(userDetails.getStudentInfo()));
+    }
+
     @PatchMapping
     public ResponseEntity<UserResponse> updateUser(
             @AuthenticationPrincipal CustomUserDetails userDetails,

src/main/java/com/team/buddyya/student/domain/Student.java

@@ -4,6 +4,7 @@
 import com.team.buddyya.certification.domain.StudentIdCard;
 import com.team.buddyya.chatting.domain.ChatroomStudent;
 import com.team.buddyya.common.domain.BaseTime;
+import com.team.buddyya.common.service.EncryptedConverter;
 import com.team.buddyya.notification.domain.ExpoToken;
 import jakarta.persistence.*;
 import lombok.Builder;
@@ -30,7 +31,8 @@ public class Student extends BaseTime {
     @GeneratedValue(strategy = IDENTITY)
     private Long id;
 
-    @Column(length = 11, nullable = false, unique = true)
+    @Convert(converter = EncryptedConverter.class)
+    @Column(length = 128, nullable = false, unique = true)
     private String phoneNumber;
 
     @Column(length = 64, nullable = false)

src/main/java/com/team/buddyya/student/service/StudentService.java

@@ -17,7 +17,9 @@
 import com.team.buddyya.student.dto.response.UserResponse;
 import com.team.buddyya.student.exception.StudentException;
 import com.team.buddyya.student.exception.StudentExceptionType;
-import com.team.buddyya.student.repository.*;
+import com.team.buddyya.student.repository.BlockRepository;
+import com.team.buddyya.student.repository.StudentRepository;
+import com.team.buddyya.student.repository.UniversityRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -170,4 +172,9 @@ public void logout(StudentInfo studentInfo) {
         }
         student.getAvatar().setLoggedOut(true);
     }
+
+    public String getPhoneNumber(StudentInfo studentInfo) {
+        Student student = findStudentService.findByStudentId(studentInfo.id());
+        return student.getPhoneNumber();
+    }
 }

src/main/resources/db/migration/V11__increase_phone_number_length.sql

@@ -0,0 +1,2 @@
+ALTER TABLE student
+    MODIFY COLUMN phone_number VARCHAR(128) NOT NULL;