秋辞未寒
2025-01-17 a2714fb9f7ffb84d850d01a2f9acd1cb27c58fdb
ruoyi-common/ruoyi-common-oss/src/main/java/org/dromara/common/oss/core/OssClient.java
@@ -2,74 +2,116 @@
import cn.hutool.core.io.IoUtil;
import cn.hutool.core.util.IdUtil;
import com.amazonaws.ClientConfiguration;
import com.amazonaws.HttpMethod;
import com.amazonaws.Protocol;
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.client.builder.AwsClientBuilder;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.*;
import org.dromara.common.core.constant.Constants;
import org.dromara.common.core.utils.DateUtils;
import org.dromara.common.core.utils.StringUtils;
import org.dromara.common.core.utils.file.FileUtils;
import org.dromara.common.oss.constant.OssConstant;
import org.dromara.common.oss.entity.UploadResult;
import org.dromara.common.oss.enumd.AccessPolicyType;
import org.dromara.common.oss.enumd.PolicyType;
import org.dromara.common.oss.exception.OssException;
import org.dromara.common.oss.properties.OssProperties;
import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
import software.amazon.awssdk.core.ResponseInputStream;
import software.amazon.awssdk.core.async.AsyncResponseTransformer;
import software.amazon.awssdk.core.async.BlockingInputStreamAsyncRequestBody;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3AsyncClient;
import software.amazon.awssdk.services.s3.S3Configuration;
import software.amazon.awssdk.services.s3.crt.S3CrtHttpConfiguration;
import software.amazon.awssdk.services.s3.model.GetObjectResponse;
import software.amazon.awssdk.services.s3.presigner.S3Presigner;
import software.amazon.awssdk.transfer.s3.S3TransferManager;
import software.amazon.awssdk.transfer.s3.model.*;
import software.amazon.awssdk.transfer.s3.progress.LoggingTransferListener;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.InputStream;
import java.io.*;
import java.net.URI;
import java.net.URL;
import java.util.Date;
import java.nio.file.Files;
import java.nio.file.Path;
import java.time.Duration;
/**
 * S3 存储协议 所有兼容S3协议的云厂商均支持
 * 阿里云 腾讯云 七牛云 minio
 *
 * @author Lion Li
 * @author AprilWind
 */
public class OssClient {
    /**
     * 服务商
     */
    private final String configKey;
    /**
     * 配置属性
     */
    private final OssProperties properties;
    private final AmazonS3 client;
    /**
     * Amazon S3 异步客户端
     */
    private final S3AsyncClient client;
    /**
     * 用于管理 S3 数据传输的高级工具
     */
    private final S3TransferManager transferManager;
    /**
     * AWS S3 预签名 URL 的生成器
     */
    private final S3Presigner presigner;
    /**
     * 构造方法
     *
     * @param configKey     配置键
     * @param ossProperties Oss配置属性
     */
    public OssClient(String configKey, OssProperties ossProperties) {
        this.configKey = configKey;
        this.properties = ossProperties;
        try {
            AwsClientBuilder.EndpointConfiguration endpointConfig =
                new AwsClientBuilder.EndpointConfiguration(properties.getEndpoint(), properties.getRegion());
            // 创建 AWS 认证信息
            StaticCredentialsProvider credentialsProvider = StaticCredentialsProvider.create(
                AwsBasicCredentials.create(properties.getAccessKey(), properties.getSecretKey()));
            AWSCredentials credentials = new BasicAWSCredentials(properties.getAccessKey(), properties.getSecretKey());
            AWSCredentialsProvider credentialsProvider = new AWSStaticCredentialsProvider(credentials);
            ClientConfiguration clientConfig = new ClientConfiguration();
            if (OssConstant.IS_HTTPS.equals(properties.getIsHttps())) {
                clientConfig.setProtocol(Protocol.HTTPS);
            } else {
                clientConfig.setProtocol(Protocol.HTTP);
            }
            AmazonS3ClientBuilder build = AmazonS3Client.builder()
                .withEndpointConfiguration(endpointConfig)
                .withClientConfiguration(clientConfig)
                .withCredentials(credentialsProvider)
                .disableChunkedEncoding();
            if (!StringUtils.containsAny(properties.getEndpoint(), OssConstant.CLOUD_SERVICE)) {
                // minio 使用https限制使用域名访问 需要此配置 站点填域名
                build.enablePathStyleAccess();
            }
            this.client = build.build();
            // MinIO 使用 HTTPS 限制使用域名访问,站点填域名。需要启用路径样式访问
            boolean isStyle = !StringUtils.containsAny(properties.getEndpoint(), OssConstant.CLOUD_SERVICE);
            createBucket();
            // 创建AWS基于 CRT 的 S3 客户端
            this.client = S3AsyncClient.crtBuilder()
                .credentialsProvider(credentialsProvider)
                .endpointOverride(URI.create(getEndpoint()))
                .region(of())
                .targetThroughputInGbps(20.0)
                .minimumPartSizeInBytes(10 * 1025 * 1024L)
                .checksumValidationEnabled(false)
                .forcePathStyle(isStyle)
                .httpConfiguration(S3CrtHttpConfiguration.builder()
                    .connectionTimeout(Duration.ofSeconds(60)) // 设置连接超时
                    .build())
                .build();
            //AWS基于 CRT 的 S3 AsyncClient 实例用作 S3 传输管理器的底层客户端
            this.transferManager = S3TransferManager.builder().s3Client(this.client).build();
            // 创建 S3 配置对象
            S3Configuration config = S3Configuration.builder().chunkedEncodingEnabled(false)
                .pathStyleAccessEnabled(isStyle).build();
            // 创建 预签名 URL 的生成器 实例,用于生成 S3 预签名 URL
            this.presigner = S3Presigner.builder()
                .region(of())
                .credentialsProvider(credentialsProvider)
                .endpointOverride(URI.create(getDomain()))
                .serviceConfiguration(config)
                .build();
        } catch (Exception e) {
            if (e instanceof OssException) {
                throw e;
@@ -78,141 +120,355 @@
        }
    }
    public void createBucket() {
    /**
     * 上传文件到 Amazon S3,并返回上传结果
     *
     * @param filePath    本地文件路径
     * @param key         在 Amazon S3 中的对象键
     * @param md5Digest   本地文件的 MD5 哈希值(可选)
     * @param contentType 文件内容类型
     * @return UploadResult 包含上传后的文件信息
     * @throws OssException 如果上传失败,抛出自定义异常
     */
    public UploadResult upload(Path filePath, String key, String md5Digest, String contentType) {
        try {
            String bucketName = properties.getBucketName();
            if (client.doesBucketExistV2(bucketName)) {
                return;
            }
            CreateBucketRequest createBucketRequest = new CreateBucketRequest(bucketName);
            AccessPolicyType accessPolicy = getAccessPolicy();
            createBucketRequest.setCannedAcl(accessPolicy.getAcl());
            client.createBucket(createBucketRequest);
            client.setBucketPolicy(bucketName, getPolicy(bucketName, accessPolicy.getPolicyType()));
            // 构建上传请求对象
            FileUpload fileUpload = transferManager.uploadFile(
                x -> x.putObjectRequest(
                        y -> y.bucket(properties.getBucketName())
                            .key(key)
                            .contentMD5(StringUtils.isNotEmpty(md5Digest) ? md5Digest : null)
                            .contentType(contentType)
                            // 用于设置对象的访问控制列表(ACL)。不同云厂商对ACL的支持和实现方式有所不同,
                            // 因此根据具体的云服务提供商,你可能需要进行不同的配置(自行开启,阿里云有acl权限配置,腾讯云没有acl权限配置)
                            //.acl(getAccessPolicy().getObjectCannedACL())
                            .build())
                    .addTransferListener(LoggingTransferListener.create())
                    .source(filePath).build());
            // 等待上传完成并获取上传结果
            CompletedFileUpload uploadResult = fileUpload.completionFuture().join();
            String eTag = uploadResult.response().eTag();
            // 提取上传结果中的 ETag,并构建一个自定义的 UploadResult 对象
            return UploadResult.builder().url(getUrl() + StringUtils.SLASH + key).filename(key).eTag(eTag).build();
        } catch (Exception e) {
            throw new OssException("创建Bucket失败, 请核对配置信息:[" + e.getMessage() + "]");
            // 捕获异常并抛出自定义异常
            throw new OssException("上传文件失败,请检查配置信息:[" + e.getMessage() + "]");
        } finally {
            // 无论上传是否成功,最终都会删除临时文件
            FileUtils.del(filePath);
        }
    }
    public UploadResult upload(byte[] data, String path, String contentType) {
        return upload(new ByteArrayInputStream(data), path, contentType);
    }
    public UploadResult upload(InputStream inputStream, String path, String contentType) {
    /**
     * 上传 InputStream 到 Amazon S3
     *
     * @param inputStream 要上传的输入流
     * @param key         在 Amazon S3 中的对象键
     * @param length      输入流的长度
     * @param contentType 文件内容类型
     * @return UploadResult 包含上传后的文件信息
     * @throws OssException 如果上传失败,抛出自定义异常
     */
    public UploadResult upload(InputStream inputStream, String key, Long length, String contentType) {
        // 如果输入流不是 ByteArrayInputStream,则将其读取为字节数组再创建 ByteArrayInputStream
        if (!(inputStream instanceof ByteArrayInputStream)) {
            inputStream = new ByteArrayInputStream(IoUtil.readBytes(inputStream));
        }
        try {
            ObjectMetadata metadata = new ObjectMetadata();
            metadata.setContentType(contentType);
            metadata.setContentLength(inputStream.available());
            PutObjectRequest putObjectRequest = new PutObjectRequest(properties.getBucketName(), path, inputStream, metadata);
            // 设置上传对象的 Acl 为公共读
            putObjectRequest.setCannedAcl(getAccessPolicy().getAcl());
            client.putObject(putObjectRequest);
            // 创建异步请求体(length如果为空会报错)
            BlockingInputStreamAsyncRequestBody body = BlockingInputStreamAsyncRequestBody.builder()
                .contentLength(length)
                .subscribeTimeout(Duration.ofSeconds(30))
                .build();
            // 使用 transferManager 进行上传
            Upload upload = transferManager.upload(
                x -> x.requestBody(body)
                    .putObjectRequest(
                        y -> y.bucket(properties.getBucketName())
                            .key(key)
                            .contentType(contentType)
                            // 用于设置对象的访问控制列表(ACL)。不同云厂商对ACL的支持和实现方式有所不同,
                            // 因此根据具体的云服务提供商,你可能需要进行不同的配置(自行开启,阿里云有acl权限配置,腾讯云没有acl权限配置)
                            //.acl(getAccessPolicy().getObjectCannedACL())
                            .build())
                    .build());
            // 将输入流写入请求体
            body.writeInputStream(inputStream);
            // 等待文件上传操作完成
            CompletedUpload uploadResult = upload.completionFuture().join();
            String eTag = uploadResult.response().eTag();
            // 提取上传结果中的 ETag,并构建一个自定义的 UploadResult 对象
            return UploadResult.builder().url(getUrl() + StringUtils.SLASH + key).filename(key).eTag(eTag).build();
        } catch (Exception e) {
            throw new OssException("上传文件失败,请检查配置信息:[" + e.getMessage() + "]");
        }
        return UploadResult.builder().url(getUrl() + "/" + path).filename(path).build();
    }
    public UploadResult upload(File file, String path) {
    /**
     * 下载文件从 Amazon S3 到临时目录
     *
     * @param path 文件在 Amazon S3 中的对象键
     * @return 下载后的文件在本地的临时路径
     * @throws OssException 如果下载失败,抛出自定义异常
     */
    public Path fileDownload(String path) {
        // 构建临时文件
        Path tempFilePath = FileUtils.createTempFile().toPath();
        // 使用 S3TransferManager 下载文件
        FileDownload downloadFile = transferManager.downloadFile(
            x -> x.getObjectRequest(
                    y -> y.bucket(properties.getBucketName())
                        .key(removeBaseUrl(path))
                        .build())
                .addTransferListener(LoggingTransferListener.create())
                .destination(tempFilePath)
                .build());
        // 等待文件下载操作完成
        downloadFile.completionFuture().join();
        return tempFilePath;
    }
    /**
     * 下载文件从 Amazon S3 到 输出流
     *
     * @param key 文件在 Amazon S3 中的对象键
     * @param out 输出流
     * @return 输出流中写入的字节数(长度)
     * @throws OssException 如果下载失败,抛出自定义异常
     */
    public long download(String key, OutputStream out) {
        try {
            PutObjectRequest putObjectRequest = new PutObjectRequest(properties.getBucketName(), path, file);
            // 设置上传对象的 Acl 为公共读
            putObjectRequest.setCannedAcl(getAccessPolicy().getAcl());
            client.putObject(putObjectRequest);
            // 构建下载请求
            DownloadRequest<ResponseInputStream<GetObjectResponse>> downloadRequest = DownloadRequest.builder()
                // 文件对象
                .getObjectRequest(y -> y.bucket(properties.getBucketName())
                    .key(key)
                    .build())
                .addTransferListener(LoggingTransferListener.create())
                // 使用订阅转换器
                .responseTransformer(AsyncResponseTransformer.toBlockingInputStream())
                .build();
            // 使用 S3TransferManager 下载文件
            Download<ResponseInputStream<GetObjectResponse>> responseFuture = transferManager.download(downloadRequest);
            // 输出到流中
            try (ResponseInputStream<GetObjectResponse> responseStream = responseFuture.completionFuture().join().result()) { // auto-closeable stream
                return responseStream.transferTo(out); // 阻塞调用线程 blocks the calling thread
            }
        } catch (Exception e) {
            throw new OssException("上传文件失败,请检查配置信息:[" + e.getMessage() + "]");
            throw new OssException("文件下载失败,错误信息:[" + e.getMessage() + "]");
        }
        return UploadResult.builder().url(getUrl() + "/" + path).filename(path).build();
    }
    /**
     * 删除云存储服务中指定路径下文件
     *
     * @param path 指定路径
     */
    public void delete(String path) {
        path = path.replace(getUrl() + "/", "");
        try {
            client.deleteObject(properties.getBucketName(), path);
            client.deleteObject(
                x -> x.bucket(properties.getBucketName())
                    .key(removeBaseUrl(path))
                    .build());
        } catch (Exception e) {
            throw new OssException("删除文件失败,请检查配置信息:[" + e.getMessage() + "]");
        }
    }
    public UploadResult uploadSuffix(byte[] data, String suffix, String contentType) {
        return upload(data, getPath(properties.getPrefix(), suffix), contentType);
    }
    public UploadResult uploadSuffix(InputStream inputStream, String suffix, String contentType) {
        return upload(inputStream, getPath(properties.getPrefix(), suffix), contentType);
    }
    public UploadResult uploadSuffix(File file, String suffix) {
        return upload(file, getPath(properties.getPrefix(), suffix));
    /**
     * 获取私有URL链接
     *
     * @param objectKey   对象KEY
     * @param expiredTime 链接授权到期时间
     */
    public String getPrivateUrl(String objectKey, Duration expiredTime) {
        // 使用 AWS S3 预签名 URL 的生成器 获取对象的预签名 URL
        URL url = presigner.presignGetObject(
                x -> x.signatureDuration(expiredTime)
                    .getObjectRequest(
                        y -> y.bucket(properties.getBucketName())
                            .key(objectKey)
                            .build())
                    .build())
            .url();
        return url.toString();
    }
    /**
     * 获取文件元数据
     * 上传 byte[] 数据到 Amazon S3,使用指定的后缀构造对象键。
     *
     * @param data   要上传的 byte[] 数据
     * @param suffix 对象键的后缀
     * @return UploadResult 包含上传后的文件信息
     * @throws OssException 如果上传失败,抛出自定义异常
     */
    public UploadResult uploadSuffix(byte[] data, String suffix, String contentType) {
        return upload(new ByteArrayInputStream(data), getPath(properties.getPrefix(), suffix), Long.valueOf(data.length), contentType);
    }
    /**
     * 上传 InputStream 到 Amazon S3,使用指定的后缀构造对象键。
     *
     * @param inputStream 要上传的输入流
     * @param suffix      对象键的后缀
     * @param length      输入流的长度
     * @return UploadResult 包含上传后的文件信息
     * @throws OssException 如果上传失败,抛出自定义异常
     */
    public UploadResult uploadSuffix(InputStream inputStream, String suffix, Long length, String contentType) {
        return upload(inputStream, getPath(properties.getPrefix(), suffix), length, contentType);
    }
    /**
     * 上传文件到 Amazon S3,使用指定的后缀构造对象键
     *
     * @param file   要上传的文件
     * @param suffix 对象键的后缀
     * @return UploadResult 包含上传后的文件信息
     * @throws OssException 如果上传失败,抛出自定义异常
     */
    public UploadResult uploadSuffix(File file, String suffix) {
        return upload(file.toPath(), getPath(properties.getPrefix(), suffix), null, FileUtils.getMimeType(suffix));
    }
    /**
     * 获取文件输入流
     *
     * @param path 完整文件路径
     * @return 输入流
     */
    public ObjectMetadata getObjectMetadata(String path) {
        path = path.replace(getUrl() + "/", "");
        S3Object object = client.getObject(properties.getBucketName(), path);
        return object.getObjectMetadata();
    public InputStream getObjectContent(String path) throws IOException {
        // 下载文件到临时目录
        Path tempFilePath = fileDownload(path);
        // 创建输入流
        InputStream inputStream = Files.newInputStream(tempFilePath);
        // 删除临时文件
        FileUtils.del(tempFilePath);
        // 返回对象内容的输入流
        return inputStream;
    }
    public InputStream getObjectContent(String path) {
        path = path.replace(getUrl() + "/", "");
        S3Object object = client.getObject(properties.getBucketName(), path);
        return object.getObjectContent();
    /**
     * 获取 S3 客户端的终端点 URL
     *
     * @return 终端点 URL
     */
    public String getEndpoint() {
        // 根据配置文件中的是否使用 HTTPS,设置协议头部
        String header = getIsHttps();
        // 拼接协议头部和终端点,得到完整的终端点 URL
        return header + properties.getEndpoint();
    }
    /**
     * 获取 S3 客户端的终端点 URL(自定义域名)
     *
     * @return 终端点 URL
     */
    public String getDomain() {
        // 从配置中获取域名、终端点、是否使用 HTTPS 等信息
        String domain = properties.getDomain();
        String endpoint = properties.getEndpoint();
        String header = getIsHttps();
        // 如果是云服务商,直接返回域名或终端点
        if (StringUtils.containsAny(endpoint, OssConstant.CLOUD_SERVICE)) {
            return StringUtils.isNotEmpty(domain) ? header + domain : header + endpoint;
        }
        // 如果是 MinIO,处理域名并返回
        if (StringUtils.isNotEmpty(domain)) {
            return domain.startsWith(Constants.HTTPS) || domain.startsWith(Constants.HTTP) ? domain : header + domain;
        }
        // 返回终端点
        return header + endpoint;
    }
    /**
     * 根据传入的 region 参数返回相应的 AWS 区域
     * 如果 region 参数非空,使用 Region.of 方法创建并返回对应的 AWS 区域对象
     * 如果 region 参数为空,返回一个默认的 AWS 区域(例如,us-east-1),作为广泛支持的区域
     *
     * @return 对应的 AWS 区域对象,或者默认的广泛支持的区域(us-east-1)
     */
    public Region of() {
        //AWS 区域字符串
        String region = properties.getRegion();
        // 如果 region 参数非空,使用 Region.of 方法创建对应的 AWS 区域对象,否则返回默认区域
        return StringUtils.isNotEmpty(region) ? Region.of(region) : Region.US_EAST_1;
    }
    /**
     * 获取云存储服务的URL
     *
     * @return 文件路径
     */
    public String getUrl() {
        String domain = properties.getDomain();
        String endpoint = properties.getEndpoint();
        String header = OssConstant.IS_HTTPS.equals(properties.getIsHttps()) ? "https://" : "http://";
        String header = getIsHttps();
        // 云服务商直接返回
        if (StringUtils.containsAny(endpoint, OssConstant.CLOUD_SERVICE)) {
            if (StringUtils.isNotBlank(domain)) {
                return header + domain;
            }
            return header + properties.getBucketName() + "." + endpoint;
            return header + (StringUtils.isNotEmpty(domain) ? domain : properties.getBucketName() + "." + endpoint);
        }
        // minio 单独处理
        if (StringUtils.isNotBlank(domain)) {
            return header + domain + "/" + properties.getBucketName();
        // MinIO 单独处理
        if (StringUtils.isNotEmpty(domain)) {
            // 如果 domain 以 "https://" 或 "http://" 开头
            return (domain.startsWith(Constants.HTTPS) || domain.startsWith(Constants.HTTP)) ?
                domain + StringUtils.SLASH + properties.getBucketName() : header + domain + StringUtils.SLASH + properties.getBucketName();
        }
        return header + endpoint + "/" + properties.getBucketName();
        return header + endpoint + StringUtils.SLASH + properties.getBucketName();
    }
    /**
     * 生成一个符合特定规则的、唯一的文件路径。通过使用日期、UUID、前缀和后缀等元素的组合,确保了文件路径的独一无二性
     *
     * @param prefix 前缀
     * @param suffix 后缀
     * @return 文件路径
     */
    public String getPath(String prefix, String suffix) {
        // 生成uuid
        String uuid = IdUtil.fastSimpleUUID();
        // 文件路径
        String path = DateUtils.datePath() + "/" + uuid;
        if (StringUtils.isNotBlank(prefix)) {
            path = prefix + "/" + path;
        }
        // 生成日期路径
        String datePath = DateUtils.datePath();
        // 拼接路径
        String path = StringUtils.isNotEmpty(prefix) ?
            prefix + StringUtils.SLASH + datePath + StringUtils.SLASH + uuid : datePath + StringUtils.SLASH + uuid;
        return path + suffix;
    }
    /**
     * 移除路径中的基础URL部分,得到相对路径
     *
     * @param path 完整的路径,包括基础URL和相对路径
     * @return 去除基础URL后的相对路径
     */
    public String removeBaseUrl(String path) {
        return path.replace(getUrl() + StringUtils.SLASH, "");
    }
    /**
     * 服务商
     */
    public String getConfigKey() {
        return configKey;
    }
    /**
     * 获取私有URL链接
     * 获取是否使用 HTTPS 的配置,并返回相应的协议头部。
     *
     * @param objectKey 对象KEY
     * @param second    授权时间
     * @return 协议头部,根据是否使用 HTTPS 返回 "https://" 或 "http://"
     */
    public String getPrivateUrl(String objectKey, Integer second) {
        GeneratePresignedUrlRequest generatePresignedUrlRequest =
            new GeneratePresignedUrlRequest(properties.getBucketName(), objectKey)
                .withMethod(HttpMethod.GET)
                .withExpiration(new Date(System.currentTimeMillis() + 1000L * second));
        URL url = client.generatePresignedUrl(generatePresignedUrlRequest);
        return url.toString();
    public String getIsHttps() {
        return OssConstant.IS_HTTPS.equals(properties.getIsHttps()) ? Constants.HTTPS : Constants.HTTP;
    }
    /**
@@ -229,34 +485,6 @@
     */
    public AccessPolicyType getAccessPolicy() {
        return AccessPolicyType.getByType(properties.getAccessPolicy());
    }
    private static String getPolicy(String bucketName, PolicyType policyType) {
        StringBuilder builder = new StringBuilder();
        builder.append("{\n\"Statement\": [\n{\n\"Action\": [\n");
        builder.append(switch (policyType) {
            case WRITE -> "\"s3:GetBucketLocation\",\n\"s3:ListBucketMultipartUploads\"\n";
            case READ_WRITE -> "\"s3:GetBucketLocation\",\n\"s3:ListBucket\",\n\"s3:ListBucketMultipartUploads\"\n";
            default -> "\"s3:GetBucketLocation\"\n";
        });
        builder.append("],\n\"Effect\": \"Allow\",\n\"Principal\": \"*\",\n\"Resource\": \"arn:aws:s3:::");
        builder.append(bucketName);
        builder.append("\"\n},\n");
        if (policyType == PolicyType.READ) {
            builder.append("{\n\"Action\": [\n\"s3:ListBucket\"\n],\n\"Effect\": \"Deny\",\n\"Principal\": \"*\",\n\"Resource\": \"arn:aws:s3:::");
            builder.append(bucketName);
            builder.append("\"\n},\n");
        }
        builder.append("{\n\"Action\": ");
        builder.append(switch (policyType) {
            case WRITE -> "[\n\"s3:AbortMultipartUpload\",\n\"s3:DeleteObject\",\n\"s3:ListMultipartUploadParts\",\n\"s3:PutObject\"\n],\n";
            case READ_WRITE -> "[\n\"s3:AbortMultipartUpload\",\n\"s3:DeleteObject\",\n\"s3:GetObject\",\n\"s3:ListMultipartUploadParts\",\n\"s3:PutObject\"\n],\n";
            default -> "\"s3:GetObject\",\n";
        });
        builder.append("\"Effect\": \"Allow\",\n\"Principal\": \"*\",\n\"Resource\": \"arn:aws:s3:::");
        builder.append(bucketName);
        builder.append("/*\"\n}\n],\n\"Version\": \"2012-10-17\"\n}\n");
        return builder.toString();
    }
}