Cloud Storage Spring (Java/Kotlin)

Here we are a Java and a Kotlin API to manage files of AWS S3, Google Cloud Storage, Azure Blob Storage and Dropbox in Spring framework.

AWS S3

Google Cloud Storage

Azure Store Blob

Dropbox

In order to use it, are necessaries the following steps:

Add dependency to Maven or Gradle:

If you use Java:

<dependency>
	<groupId>com.github.sevtech-dev</groupId>
	<artifactId>cloud-storage-spring-java</artifactId>
	<version>${currentVersion}</version>
</dependency>

implementation 'com.github.sevtech-dev:cloud-storage-spring-java:${currentVersion}'

If you use Kotlin:

<dependency>
	<groupId>com.github.sevtech-dev</groupId>
	<artifactId>cloud-storage-spring-kotlin</artifactId>
	<version>${currentVersion}</version>
</dependency>

implementation 'com.github.sevtech-dev:cloud-storage-spring-kotlin:${currentVersion}'

${currentVersion} right now is 1.1.2

Configuration

To enable the wanted client configuration, you must set the following properties:

To AWS S3:

aws:
  s3:
    enabled: true
    accessKey: [AMAZON_ACCESS_KEY]
    secretKey: [AMAZON_SECRET_KEY]
    bucket:
      name: yourbucketname
    region: [GovCloud("us-gov-west-1"),
             US_EAST_1("us-east-1"),
             US_WEST_1("us-west-1"),
             US_WEST_2("us-west-2"),
             EU_WEST_1("eu-west-1"),
             EU_CENTRAL_1("eu-central-1"),
             AP_SOUTH_1("ap-south-1"),
             AP_SOUTHEAST_1("ap-southeast-1"),
             AP_SOUTHEAST_2("ap-southeast-2"),
             AP_NORTHEAST_1("ap-northeast-1"),
             AP_NORTHEAST_2("ap-northeast-2"),
             SA_EAST_1("sa-east-1"),
             CN_NORTH_1("cn-north-1")]*

** Only one and only the string of the region.

• accessKey/secretKey: the keys to connect to AWS. To get it, check out this information.
• bucket.name: the bucket name.
• region: AWS region where your bucket is located.

To Google Cloud Storage:

gcp:
  storage:
    enabled: true
    bucket:
      name: yourbucketname
    keyfile: "where-you-keyfile"

• bucket.name: the bucket name.
• keyfile: the file to authenticate. To generate it, check out this information.

To Azure Blob Storage:

azure:
  blob:
    storage:
      enabled: true
      connectionString: "your-connection-string"
      container:
        name: containername

• connectionString: to get it, check out this information.
• container.name: name of your files container.

To Dropbox:

dropbox:
  enabled: true
  accessToken: "accessToken"
  clientIdentifier: "clientIdentifier"

• accessToken: to get it, check out this information.
• clientIdentifier: name of your app.

Enable async

Add @EnableAsync annotation in your Spring Application class to enable async upload method.

File size

To controle max size of files you can upload, set the following properties:

spring:
  servlet:
    multipart:
      max-file-size: 128KB
      max-request-size: 128KB

How to use

You have to inject StorageService as dependency in your Spring component.

If you use more than one provider, you must name your bean as awsS3Service to AWS S3, googleCloudStorageService to Google Cloud Storage, azureBlobStorageService to Azure Blob Storage, and dropboxService to Dropbox.

The service provide these methods:

Java

public interface StorageService {
	
    UploadFileResponse uploadFile(UploadFileRequest request);
    
    Future<UploadFileResponse> uploadFileAsync(UploadFileRequest request);

    GetFileResponse getFile(GetFileRequest request);

    DeleteFileResponse deleteFile(DeleteFileRequest request);

}

Kotlin

interface StorageService {
    
    fun uploadFile(request: UploadFileRequest): UploadFileResponse
    
    fun uploadFileAsync(request: UploadFileRequest): Future<UploadFileResponse>

    fun getFile(request: GetFileRequest): GetFileResponse

    fun deleteFile(request: DeleteFileRequest): DeleteFileResponse

}

Model

Upload

UploadFileRequest

• stream (InputStream): content of your file.
• folder (String): folder where you want to save the file. Ex: folder/subfolder1/subfolder2
• name (String): name of the uploaded file. Ex: image.jpg, image
• contentType (String): type of content of the file.
• bucketName (String, optional)
• accessControl

UploadFileResponse

• fileName (String): final name of the uploaded file.
• status (int): status of the operation. 200 OK or 500 KO.
• cause (String): cause of the fail.
• exception (Exception): exception.
• comment (String): optional comment.

Get

GetFileRequest

• path (String): complete path where you want to get the file from. Ex: folder/subfolder1/subfolder2/file.jpg
• bucketName (String, optional)

GetFileResponse

• stream (InputStream): content of your file.
• status (int): status of the operation. 200 OK or 500 KO.
• cause (String): cause of the fail.
• exception (Exception): exception.

Delete

DeleteFileRequest

• path (String): complete path where you want to get the file from. Ex: folder/subfolder1/subfolder2/file.jpg
• bucketName (String, optional)

DeleteFileResponse

• result boolean): result of the deletion. true ok or false ko.
• status (int): status of the operation. 200 OK or 500 KO.
• cause (String): cause of the fail.
• exception (Exception): exception.

Test in local

AWS S3: Localstack support

This library can be tested with Localstack. You only have to set the following properties in your application.yml:

aws:
  s3:
    localstack:
      enabled: true
      endpoint: http://localhost:4572
      region: us-east-1

In order to run easily Localstack, I have added docker-compose.yml file to the folder localstack. You have run the command docker-compose up to make it work.

I hardly recommend install AWS CLI in your local. It helps you to manage the buckets to run the tests with Localstack. Here you are the documentation to install the version 2: https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2.html

To create a local bucket you must run this command aws2 --endpoint-url=http://localhost:4572 s3 mb s3://mytestbucket

To check out if the bucket has been created run this command aws2 --endpoint-url=http://localhost:4572 s3 ls

When you create a bucket, you have to add yourbucketname.localhost to your hosts local file mapped to 127.0.0.1.

Here we are the AWS CLI S3 command options: https://docs.aws.amazon.com/en_en/cli/latest/userguide/cli-services-s3-commands.html

Next adds

• Support to Alibaba Cloud Object Storage Service, Oracle Object Storage, Google Drive...
• File permissions management.

License

This project is licensed under the MIT License - see the LICENSE.md file for details.