proposal-system/api/src/ProposalSystem.Infrastructure/Services/S3Service.cs

using Amazon.S3;
using Amazon.S3.Model;
using ProposalSystem.Application.Interfaces;

namespace ProposalSystem.Infrastructure.Services;

public class S3Service : IS3Service
{
    private readonly IAmazonS3 _s3Client;

    public S3Service(IAmazonS3 s3Client)
    {
        _s3Client = s3Client;
    }

    public Task<string> GeneratePresignedUploadUrlAsync(string bucket, string key, string contentType, int expirationMinutes = 15)
    {
        var request = new GetPreSignedUrlRequest
        {
            BucketName = bucket,
            Key = key,
            Verb = HttpVerb.PUT,
            Expires = DateTime.UtcNow.AddMinutes(expirationMinutes),
            ContentType = contentType,
        };

        var url = _s3Client.GetPreSignedURL(request);
        return Task.FromResult(url);
    }

    public Task<string> GeneratePresignedDownloadUrlAsync(string bucket, string key, int expirationMinutes = 60)
    {
        var request = new GetPreSignedUrlRequest
        {
            BucketName = bucket,
            Key = key,
            Verb = HttpVerb.GET,
            Expires = DateTime.UtcNow.AddMinutes(expirationMinutes),
        };

        var url = _s3Client.GetPreSignedURL(request);
        return Task.FromResult(url);
    }
}