Upload file to Digital Ocean space using .net

 

When user choose any file from local HD [in the second textbox], or put any external URL in the first textbox, a callback event will run and upload this file to Azure blob and put the short link in the first textbox to save to database as varchar[200]

OnChange in Javascript call C# API method that can accept File or URL

<form asp-action="Create">
		<div class="form-group position-relative">
			<label asp-for="Image" class="control-label"></label>
			<input asp-for="Image" class="form-control" id="ximage-form" />
			<span asp-validation-for="Image" class="text-danger"></span>
			<div class="input-group mb-3 custom-file-with-url">
				<div class="custom-file">
					<input type="file" class="custom-file-input" id="ximage-file" aria-describedby="inputGroupFileAddon01" accept="image/*" >
					<label class="custom-file-label" for="ximage-file"></label>
				</div>
			</div>
			<div class="row">
				<img id="xloading-img" class="d-none mx-auto" src="~/assets/images/loading.gif" alt="" />
			</div>
		</div>
		<div class="form-group">
			<input id="submit-btn" type="submit" value="Create" class="btn btn-primary" />
		</div>
</form>


<script>
	function isImage(url) {
	  return /^https?:\/\/.+\.(jpg|jpeg|png|webp|avif|gif|svg)$/.test(url);
	}

    $(document).ready(function () {
        $("#ximage-form").change(function () {
				var file = $("#ximage-form").val();
                console.log(file);

                if (!(isImage(file))) {
                    alert("It is not a image. Please choose a image format file to upload.");
                    return;
                }

                const fd = new FormData();

                fd.append("URL", file);
                $("#submit-btn").addClass("d-none");
                $("#xloading-img").removeClass("d-none");
                $.ajax({
                    url: "/FileUpload/Upload",
                    enctype: 'multipart/form-data',
                    method: "PUT",
                    processData: false,
                    contentType: false,
                    cache: false,
                    data: fd,
                    success: function (data) {
                        $("#ximage-form").val(data);
                        $("#submit-btn").removeClass("d-none");
                        $("#xloading-img").addClass("d-none");
                    }
                });

            
        });
    });
</script>

<script>
    $(document).ready(function () {
        $("#ximage-file").change(function () {
            const files = [...document.querySelector('#ximage-file').files];
            files.forEach(file => {
                console.log(file);

                if (!file.type.match("image/")) {
                    alert(file.name + " is not a image. Please choose a image format file to upload.");
                    console.log(file.type);
                    return;
                }

                const fd = new FormData();

                fd.append("File2Upload", file);
                $("#submit-btn").addClass("d-none");
                $("#xloading-img").removeClass("d-none");
                $.ajax({
                    url: "/FileUpload/Upload",
                    enctype: 'multipart/form-data',
                    method: "POST",
                    processData: false,
                    contentType: false,
                    cache: false,
                    data: fd,
                    success: function (data) {
                        $("#ximage-form").val(data);
                        $("#submit-btn").removeClass("d-none");
                        $("#xloading-img").addClass("d-none");
                    }
                });

            });
        });
    });
</script>

using Microsoft.AspNetCore.Mvc;
using Amazon.S3;
using Amazon.S3.Transfer;

namespace ArabAuthorsIndex.Controllers
{
    public class FileUploadController : Controller
    {
        [HttpPost]
        public async Task<string> Upload([FromForm] IFormFile File2Upload, [FromForm] string Name)
        {
            if (File2Upload == null) return "";

            string fileName = string.IsNullOrEmpty(Name) ? $"{DateTime.Now.Ticks}-{File2Upload.FileName.Replace(" ", "-")}" : Name;

            var newMemoryStream = new MemoryStream();
            File2Upload.CopyTo(newMemoryStream);


            var s3ClientConfig = new AmazonS3Config
            {
                ServiceURL = "https://sgp1.digitaloceanspaces.com"
            };
            IAmazonS3 s3Client = new AmazonS3Client(AccessKey, SecretKey, s3ClientConfig);
            try
            {
                var fileTransferUtility = new TransferUtility(s3Client);
                var fileTransferUtilityRequest = new TransferUtilityUploadRequest
                {
                    BucketName = "ddl-temp" ,
                    InputStream = newMemoryStream,
                    StorageClass = S3StorageClass.StandardInfrequentAccess,
                    PartSize = 6291456, // 6 MB
                    Key = fileName,
                    CannedACL = S3CannedACL.PublicRead
                };
                fileTransferUtility.Upload(fileTransferUtilityRequest);
                return $"https://ddl-temp.sgp1.digitaloceanspaces.com/{fileName}";
            }
            catch (AmazonS3Exception e)
            {
                Console.WriteLine("Error encountered ***. Message:'{0}' when writing an object", e.Message);
            }
            catch (Exception e)
            {
                Console.WriteLine("Unknown encountered on server. Message:'{0}' when writing an object", e.Message);
                if (e.Message.Contains("disposed"))
                    return "";
            }
            return "";
        }



        [HttpPut]
        public async Task<string> Upload(string URL, string Name)
        {
            try
            {
                if (URL == null) return "";

                Uri fileURL = new Uri(URL);
                var fileName = fileURL.Segments.Last();

                fileName = string.IsNullOrEmpty(Name) ? $"{DateTime.Now.Ticks}-{fileName.Replace(" ", "-")}" : Name;

                // Download the file from the URL and upload it to S3
                using (var httpClient = new HttpClient())
                {
                    using (var response = await httpClient.GetAsync(fileURL))
                    {
                        if (!response.IsSuccessStatusCode)
                        {
                            return URL; // Handle download errors
                        }

                        using (var newMemoryStream = await response.Content.ReadAsStreamAsync())
                        {

                            var s3ClientConfig = new AmazonS3Config
                            {
                                ServiceURL = "https://sgp1.digitaloceanspaces.com"
                            };
                            IAmazonS3 s3Client = new AmazonS3Client(AccessKey, SecretKey, s3ClientConfig);
                            try
                            {
                                var fileTransferUtility = new TransferUtility(s3Client);
                                var fileTransferUtilityRequest = new TransferUtilityUploadRequest
                                {
                                    BucketName = "ddl-temp",
                                    InputStream = newMemoryStream,
                                    StorageClass = S3StorageClass.StandardInfrequentAccess,
                                    PartSize = 6291456, // 6 MB
                                    Key = fileName,
                                    CannedACL = S3CannedACL.PublicRead
                                };
                                fileTransferUtility.Upload(fileTransferUtilityRequest);
                                return $"https://ddl-temp.sgp1.digitaloceanspaces.com/{fileName}";
                            }
                            catch (AmazonS3Exception e)
                            {
                                Console.WriteLine("Error encountered ***. Message:'{0}' when writing an object", e.Message);
                            }
                            catch (Exception e)
                            {
                                Console.WriteLine("Unknown encountered on server. Message:'{0}' when writing an object", e.Message);
                                if (e.Message.Contains("disposed"))
                                    return "";
                            }


                        }
                    }
                }

                return $"https://ddl-temp.sgp1.digitaloceanspaces.com/{fileName}";
            }
            catch (Exception ex)
            {
                return "";
            }
        }

    }
}

//Notes

Install the AWS SDK:
Make sure you have the AWS SDK for .NET (AWSSDK.S3) installed in your project. You can use NuGet Package Manager to install it.