✨ feat: S3 저장 로직 생성

build.gradle

@@ -56,6 +56,8 @@ dependencies {
 
     // Spring Security 설정
     implementation 'org.springframework.boot:spring-boot-starter-security'
+
+    implementation 'org.springframework.cloud:spring-cloud-starter-aws:2.2.6.RELEASE'
 }
 
 tasks.register('importConfigSubmodule', Copy) {

src/main/java/slvtwn/khu/toyouserver/agent/aws/AwsConfiguration.java

@@ -0,0 +1,33 @@
+package slvtwn.khu.toyouserver.agent.aws;
+
+import com.amazonaws.auth.AWSStaticCredentialsProvider;
+import com.amazonaws.auth.BasicAWSCredentials;
+import com.amazonaws.services.s3.AmazonS3Client;
+import com.amazonaws.services.s3.AmazonS3ClientBuilder;
+import lombok.Getter;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Getter
+@Configuration
+public class AwsConfiguration {
+
+    @Value("cloud.aws.credentials.access-key")
+    private String accessKey;
+    @Value("cloud.aws.credentials.secret-key")
+    private String secretKey;
+    @Value("cloud.aws.region.static")
+    private String region;
+    @Value("${cloud.aws.s3.bucket}")
+    private String bucket;
+
+    @Bean
+    public AmazonS3Client amazonS3Client() {
+        BasicAWSCredentials awsCredentials = new BasicAWSCredentials(accessKey, secretKey);
+        return (AmazonS3Client) AmazonS3ClientBuilder.standard()
+                .withRegion(region)
+                .withCredentials(new AWSStaticCredentialsProvider(awsCredentials))
+                .build();
+    }
+}

src/main/java/slvtwn/khu/toyouserver/agent/aws/S3Agent.java

@@ -0,0 +1,35 @@
+package slvtwn.khu.toyouserver.agent.aws;
+
+import com.amazonaws.services.s3.AmazonS3Client;
+import com.amazonaws.services.s3.model.ObjectMetadata;
+import com.amazonaws.services.s3.model.PutObjectRequest;
+import java.io.ByteArrayInputStream;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
+import slvtwn.khu.toyouserver.common.response.ResponseType;
+import slvtwn.khu.toyouserver.exception.ToyouException;
+
+@RequiredArgsConstructor
+@Component
+public class S3Agent {
+
+    private final AmazonS3Client amazonS3Client;
+    private final AwsConfiguration configuration;
+
+    public String uploadFile(byte[] fileData, String fileName, String contentType) {
+        try {
+            String fileUrl = "https://" + configuration.getBucket() + "/to-you/" + fileName;
+
+            ObjectMetadata metadata = new ObjectMetadata();
+            metadata.setContentType(contentType);
+            metadata.setContentLength(fileData.length);
+
+            ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(fileData);
+            amazonS3Client.putObject(new PutObjectRequest(configuration.getBucket(), fileName, byteArrayInputStream, metadata));
+
+            return fileUrl;
+        } catch (Exception e) {
+            throw new ToyouException(ResponseType.INTERNAL_SERVER_ERROR);
+        }
+    }
+}