feat: 편지 작성시 본문 내용 암호화하여 저장되도록 수정 #3

build.gradle

@@ -27,6 +27,7 @@ dependencies {
     implementation 'io.springfox:springfox-swagger2:2.9.2'
     implementation 'io.jsonwebtoken:jjwt:0.9.1'
     implementation 'com.googlecode.json-simple:json-simple:1.1.1'
+    implementation 'commons-codec:commons-codec:1.15'
     implementation 'org.projectlombok:lombok'
     runtimeOnly 'com.h2database:h2'
     annotationProcessor 'org.projectlombok:lombok'

src/main/java/com/nexters/covid/letter/api/dto/LetterResponse.java

@@ -1,6 +1,7 @@
 package com.nexters.covid.letter.api.dto;
 
 import static org.springframework.beans.BeanUtils.copyProperties;
+import static org.apache.commons.codec.binary.Base64.decodeBase64;
 
 import com.nexters.covid.letter.domain.Letter;
 import com.nexters.covid.letter.domain.State;
@@ -31,5 +32,10 @@ public class LetterResponse {
 
   public LetterResponse(Letter source) {
     copyProperties(source, this);
+    this.contents = decodeContents(source.getContents());
+  }
+
+  private String decodeContents(String contents) {
+    return new String(decodeBase64(contents));
   }
 }

src/main/java/com/nexters/covid/letter/domain/Letter.java

@@ -1,5 +1,7 @@
 package com.nexters.covid.letter.domain;
 
+import static org.apache.commons.codec.binary.Base64.encodeBase64String;
+
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.nexters.covid.base.BaseEntity;
 import com.nexters.covid.letter.api.dto.LetterRequest;
@@ -52,7 +54,7 @@ public Letter(LetterRequest request, User user) {
     this.user = user;
     this.letterTo = request.getEmail();
     this.title = request.getTitle();
-    this.contents = request.getContents();
+    this.contents = encodeContents(request.getContents());
     this.email = user.getEmail();
     this.state = State.PENDING;
     this.sticker = request.getSticker();
@@ -63,4 +65,8 @@ public Letter(LetterRequest request, User user) {
   private String generateEncryptedId() {
     return UUID.randomUUID().toString();
   }
+
+  private String encodeContents(String contents) {
+    return encodeBase64String(contents.getBytes());
+  }
 }