S3 Presigned Api UploadController Complete

UploadController.cs

using Amazon;
using Amazon.S3;
using Amazon.S3.Model;
using Api.Models;
using Microsoft.AspNetCore.Mvc;

namespace Api.Controllers;

[ApiController]
[Route("[controller]")]
public class UploadController : ControllerBase
{

    [HttpPost]
    public async Task<IActionResult> Post(CreateSignedUrlRequest createSignedUrlRequest)
    {

        string bucketName = "";
        string key = Guid.NewGuid().ToString() + ".txt";
        RegionEndpoint bucketRegion = RegionEndpoint.USEast1;

        var client = new AmazonS3Client(bucketRegion);

        var putRequest = new PutObjectRequest
        {
            BucketName = bucketName,
            Key = key,
            ContentBody = createSignedUrlRequest.Content
        };

        PutObjectResponse putObjectResponse = await client.PutObjectAsync(putRequest);

        GetPreSignedUrlRequest preSignedUrlRequest = new GetPreSignedUrlRequest
        {
            BucketName = bucketName,
            Key = key,
            Expires = DateTime.UtcNow.AddHours(createSignedUrlRequest.TimeToLiveInHours)
        };

        string preSignedUrl = client.GetPreSignedURL(preSignedUrlRequest);

        return Ok(preSignedUrl);

    }
}