DocSpace-buildtools/common/services/ASC.Data.Backup/Storage/S3BackupStorage.cs

/*
 *
 * (c) Copyright Ascensio System Limited 2010-2020
 *
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 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
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*/


using System;
using System.IO;

using ASC.Common.Logging;

using Amazon;
using Amazon.S3;
using Amazon.S3.Model;
using Amazon.S3.Transfer;
using Microsoft.Extensions.Options;

namespace ASC.Data.Backup.Storage
{
    internal class S3BackupStorage : IBackupStorage
    {
        private readonly string accessKeyId;
        private readonly string secretAccessKey;
        private readonly string bucket;
        private readonly string region;

        private readonly ILog log;

        public S3BackupStorage(IOptionsMonitor<ILog> options ,string accessKeyId, string secretAccessKey, string bucket, string region)
        {
            log = options.CurrentValue;
            this.accessKeyId = accessKeyId;
            this.secretAccessKey = secretAccessKey;
            this.bucket = bucket;
            this.region = region;
        }

        public string Upload(string storageBasePath, string localPath, Guid userId)
        {
            var key = String.Empty;

            if (String.IsNullOrEmpty(storageBasePath))
                key = "backup/" + Path.GetFileName(localPath);
            else                        
                key = String.Concat(storageBasePath.Trim(new char[] {' ', '/', '\\'}), "/", Path.GetFileName(localPath));

            using (var fileTransferUtility = new TransferUtility(accessKeyId, secretAccessKey, RegionEndpoint.GetBySystemName(region)))
            {
                fileTransferUtility.Upload(
                    new TransferUtilityUploadRequest
                    {
                        BucketName = bucket,
                        FilePath = localPath,
                        StorageClass = S3StorageClass.StandardInfrequentAccess,
                        PartSize = 6291456, // 6 MB.
                        Key = key
                    });
            }


            return key;
        }

        public void Download(string storagePath, string targetLocalPath)
        {
            var request = new GetObjectRequest
                {
                    BucketName = bucket,
                    Key = GetKey(storagePath),
                };

            using (var s3 = GetClient())
            using (var response = s3.GetObjectAsync(request).Result)
            {
               response.WriteResponseStreamToFileAsync(targetLocalPath, true, new System.Threading.CancellationToken());
            }
        }

        public void Delete(string storagePath)
        {
            using (var s3 = GetClient())
            {
               s3.DeleteObjectAsync(new DeleteObjectRequest
                    {
                        BucketName = bucket,
                        Key = GetKey(storagePath)
                    });
            }
        }

        public bool IsExists(string storagePath)
        {
            using (var s3 = GetClient())
            {
                try
                {
                    var request = new ListObjectsRequest { BucketName = bucket, Prefix = GetKey(storagePath) };
                    var response =  s3.ListObjectsAsync(request).Result;
                    return response.S3Objects.Count > 0;
                }
                catch (AmazonS3Exception ex)
                {
                    log.Warn(ex);

                    return false;
                }
            }
        }

        public string GetPublicLink(string storagePath)
        {
            using (var s3 = GetClient())
            {
                return s3.GetPreSignedURL(
                    new GetPreSignedUrlRequest
                        {
                            BucketName = bucket,
                            Key = GetKey(storagePath),
                            Expires = DateTime.UtcNow.AddDays(1),
                            Verb = HttpVerb.GET
                        });
            }
        }

        private string GetKey(string fileName)
        {
           // return "backup/" + Path.GetFileName(fileName);
            return fileName;
        }

        private AmazonS3Client GetClient()
        {
            return new AmazonS3Client(accessKeyId, secretAccessKey, new AmazonS3Config { RegionEndpoint = RegionEndpoint.GetBySystemName(region) });
        }
    }
}