marco.pms.api/Marco.Pms.Services/Service/S3UploadService.cs

using Amazon.S3;
using Amazon.S3.Model;
using Amazon.S3.Transfer;
using Marco.Pms.Model.Utilities;
using Microsoft.Extensions.Options;

namespace Marco.Pms.Services.Service
{

    public class S3UploadService
    {
        private readonly IAmazonS3 _s3Client;
        private readonly string _bucketName = "your-bucket-name";

        public S3UploadService(IOptions<AWSSettings> awsOptions)
        {
            var settings = awsOptions.Value;

            var region = Amazon.RegionEndpoint.GetBySystemName(settings.Region);
            _bucketName = settings.BucketName;

            _s3Client = new AmazonS3Client(settings.AccessKey, settings.SecretKey, region);
        }
        //public async Task<string> UploadFileAsync(string fileName, string contentType)
        public async Task<string> UploadFileAsync(Stream fileStream, string fileName, string contentType)
        {
            // Generate a unique object key (you can customize this)
            var objectKey = $"{Guid.NewGuid()}_{fileName}";

            var uploadRequest = new TransferUtilityUploadRequest
            {
                InputStream = fileStream,
                Key = objectKey,
                BucketName = _bucketName,
                ContentType = contentType,
                AutoCloseStream = true
            };

            var transferUtility = new TransferUtility(_s3Client);
            await transferUtility.UploadAsync(uploadRequest);

            return objectKey;
        }
        public async Task<string> GeneratePreSignedUrlAsync(string objectKey)
        {
            int expiresInMinutes = 1;
            var request = new GetPreSignedUrlRequest
            {
                BucketName = _bucketName,
                Key = objectKey,
                Expires = DateTime.UtcNow.AddMinutes(expiresInMinutes),
                Verb = HttpVerb.GET // for download
            };

            string url = _s3Client.GetPreSignedURL(request);
            return url;
        }
    }
}