feat: S3 관련 클래스 추가 (#24)

src/main/java/com/teamA/hicardi/common/s3/FileService.java

@@ -0,0 +1,68 @@
+package com.teamA.hicardi.common.s3;
+
+import com.amazonaws.services.s3.AmazonS3Client;
+import com.amazonaws.services.s3.model.DeleteObjectRequest;
+import com.amazonaws.services.s3.model.ObjectMetadata;
+import com.teamA.hicardi.error.exception.custom.BusinessException;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+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;
+import java.util.UUID;
+
+import static com.teamA.hicardi.error.ErrorCode.INVALID_FILE_UPLOAD;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class FileService {
+
+    private final AmazonS3Client amazonS3Client;
+
+    @Value("${cloud.aws.s3.bucket.name}")
+    private String bucketName;
+
+    @Value("${cloud.aws.s3.bucket.url}")
+    private String defaultUrl;
+
+    public String uploadFile(MultipartFile multipartFile, String imageType) {
+        if (multipartFile == null || multipartFile.isEmpty()) return null;
+
+        String savedFileName = getSavedFileName(multipartFile, imageType);
+        ObjectMetadata metadata = new ObjectMetadata();
+
+        try (InputStream inputStream = multipartFile.getInputStream()) {
+            amazonS3Client.putObject(bucketName, savedFileName, inputStream, metadata);
+        } catch (IOException e) {
+            log.error("Failed to upload image", e);
+            throw new BusinessException(INVALID_FILE_UPLOAD);
+        }
+        return getResourceUrl(savedFileName);
+    }
+
+    public void deleteFile(String fileUrl) {
+        String fileName = getFileNameFromResourceUrl(fileUrl);
+        amazonS3Client.deleteObject(new DeleteObjectRequest(bucketName, fileName));
+    }
+
+    private String getSavedFileName(MultipartFile multipartFile, String imageType) {
+        return String.format("%s/%s-%s",
+                 imageType, getRandomUUID(), multipartFile.getOriginalFilename());
+    }
+
+    private String getRandomUUID() {
+        return UUID.randomUUID().toString().replace("-", "");
+    }
+
+    private String getResourceUrl(String savedFileName) {
+        return amazonS3Client.getResourceUrl(bucketName, savedFileName);
+    }
+
+    private String getFileNameFromResourceUrl(String fileUrl) {
+        return fileUrl.replace(defaultUrl + "/", "");
+    }
+}

src/main/java/com/teamA/hicardi/config/S3Config.java

@@ -0,0 +1,33 @@
+package com.teamA.hicardi.config;
+
+import com.amazonaws.auth.AWSStaticCredentialsProvider;
+import com.amazonaws.auth.BasicAWSCredentials;
+import com.amazonaws.services.s3.AmazonS3Client;
+import com.amazonaws.services.s3.AmazonS3ClientBuilder;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class S3Config {
+
+    @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;
+
+    @Bean
+    public AmazonS3Client amazonS3Client() {
+        BasicAWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);
+
+        return (AmazonS3Client) AmazonS3ClientBuilder
+                .standard()
+                .withRegion(region)
+                .withCredentials(new AWSStaticCredentialsProvider(credentials))
+                .build();
+    }
+}