기존 이미지 업로드 서버를 깃헙 레포로 쓰던걸 aws s3로 스택 마이그레이션, 전략패턴을 사용해 유연한 확장 실천

build.gradle

@@ -54,6 +54,8 @@ dependencies {
 	implementation 'org.commonmark:commonmark-ext-gfm-tables:0.18.0'
 	implementation group: 'org.jdom', name: 'jdom2', version: '2.0.6'
 	implementation group: 'net.sf.ehcache', name: 'ehcache', version: '2.10.9.2'
+	implementation group: 'com.amazonaws', name: 'aws-java-sdk-s3', version: '1.12.152'
+
 
 	compileOnly 'org.projectlombok:lombok'
 	developmentOnly 'org.springframework.boot:spring-boot-devtools'

src/main/java/myblog/blog/base/config/AppConfig.java

@@ -1,13 +1,25 @@
 package myblog.blog.base.config;
 
+import com.amazonaws.auth.AWSCredentials;
+import com.amazonaws.auth.AWSStaticCredentialsProvider;
+import com.amazonaws.auth.BasicAWSCredentials;
+import com.amazonaws.regions.Regions;
+import com.amazonaws.services.s3.AmazonS3;
+import com.amazonaws.services.s3.AmazonS3ClientBuilder;
 import com.google.gson.Gson;
 import org.modelmapper.ModelMapper;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
 @Configuration
 public class AppConfig {
 
+    @Value("${cloud.aws.credentials.accessKey}")
+    private String AWS_ACCESS_KEY_ID;
+    @Value("${cloud.aws.credentials.secretKey}")
+    private String AWS_SECRET_ACCESS_KEY;
+
     /*
         - DTO <-> 엔티티 매퍼 빈등록
     */
@@ -19,4 +31,17 @@ public class AppConfig {
                 .setFieldMatchingEnabled(true);
         return modelMapper;
     }
+
+    /**
+     * AWS S3 설정
+     */
+    @Bean
+    public AmazonS3 S3() {
+        AWSCredentials awsCredentials =
+                new BasicAWSCredentials(AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY);
+        return AmazonS3ClientBuilder
+                .standard()
+                .withCredentials(new AWSStaticCredentialsProvider(awsCredentials)).withRegion(Regions.AP_NORTHEAST_2)
+                .build();
+    }
 }

src/main/java/myblog/blog/imgupload/service/AwsS3ImgUploadStrategy.java

@@ -0,0 +1,47 @@
+package myblog.blog.imgupload.service;
+
+import com.amazonaws.services.s3.AmazonS3;
+import com.amazonaws.services.s3.model.*;
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * S3 이미지 업로드 전략 구현체
+ */
+@RequiredArgsConstructor
+@Service
+public class AwsS3ImgUploadStrategy implements ImgUploadStrategy {
+
+    private final AmazonS3 amazonS3;
+    @Value("${cloud.aws.s3.bucket}")
+    private String bucket;
+
+    @Override
+    public String uploadFile(MultipartFile file, String storeFileName) {
+        ObjectMetadata metadata = createObjectMetadata(file);
+        try(InputStream inputStream = file.getInputStream()) {
+            amazonS3.putObject(new PutObjectRequest(bucket, storeFileName, inputStream, metadata)
+                    .withCannedAcl(CannedAccessControlList.PublicRead));
+        } catch (IOException e) {
+            throw new IllegalArgumentException("파일 업로드에 실패했습니다.");
+        }
+        return amazonS3.getUrl(bucket, storeFileName).toString();
+    }
+
+    /**
+     * s3 api를 위한 dto 생성 메서드
+     * @param file 업로드 요청된 이미지 파일
+     * @return s3 api 요구 스펙 dto
+     */
+    private ObjectMetadata createObjectMetadata(MultipartFile file) {
+        ObjectMetadata metadata = new ObjectMetadata();
+        metadata.setContentLength(file.getSize());
+        metadata.setContentType(file.getContentType());
+        return metadata;
+    }
+}

src/main/java/myblog/blog/imgupload/service/GithubRepoImgUploadStrategy.java

@@ -13,8 +13,8 @@ import java.io.IOException;
 /**
  * 깃헙 레포 이미지 업로드 전략 구현체
  */
-@RequiredArgsConstructor
-@Service
+//@RequiredArgsConstructor
+//@Service
 public class GithubRepoImgUploadStrategy implements ImgUploadStrategy {
 
     /*