Connect and Upload Files Programmatically to Azure Blob Storage

using Azure.Storage.Blobs;

namespace UmbracoProject
{
    public class BlobStorageService
    {
        public BlobContainerClient GetContainerClient(string connectionString, string containerName)
        {
            BlobServiceClient blobServiceClient = new BlobServiceClient(connectionString);
            BlobContainerClient containerClient = blobServiceClient.GetBlobContainerClient(containerName);
            return containerClient;

        }
    }
}

using Umbraco.Cms.Core.Composing;

namespace UmbracoProject;

public class BlobStorageComposer : IComposer
{
    public void Compose(IUmbracoBuilder builder)
    {
        builder.Services.AddScoped<BlobStorageService>();

    }
}

using Azure.Storage.Blobs;
using Microsoft.AspNetCore.Mvc;
using Umbraco.Cms.Core.Cache;
using Umbraco.Cms.Core.Logging;
using Umbraco.Cms.Core.Routing;
using Umbraco.Cms.Core.Services;
using Umbraco.Cms.Core.Web;
using Umbraco.Cms.Infrastructure.Persistence;
using Umbraco.Cms.Web.Website.Controllers;

namespace UmbracoProject;

public class BlobStorageController : SurfaceController
{

    private readonly BlobStorageService _blobStorageService;

    public BlobStorageController(
        IUmbracoContextAccessor umbracoContextAccessor,
        IUmbracoDatabaseFactory databaseFactory,
        ServiceContext services,
        AppCaches appCaches,
        IProfilingLogger profilingLogger,
        IPublishedUrlProvider publishedUrlProvider,
        BlobStorageService blobStorageService)
        : base(umbracoContextAccessor, databaseFactory, services, appCaches, profilingLogger, publishedUrlProvider)
    {
        _blobStorageService = blobStorageService;
    }

    // access the endpoint in backoffice via /umbraco/surface/BlobStorage/BlobUpdate
    public async Task<IActionResult> BlobUpdate()
    {

        string SASUrl = "Replace this with the Shared access signature URL (SAS) from Umbraco Cloud settings"; 
        string containerName = "Replace this with the Container Name from the Umbraco Cloud settings"; 

        string connectionString = $"BlobEndpoint={SASUrl}";

        BlobContainerClient containerClient = _blobStorageService.GetContainerClient(connectionString, containerName);

        string localPath = "data";
        Directory.CreateDirectory(localPath);
        string fileName = Guid.NewGuid().ToString() + ".txt";
        string localFilePath = Path.Combine(localPath, fileName);

        try
        {
            // Write some content to the file
            await using (StreamWriter writer = new StreamWriter(localFilePath))
            {
                await writer.WriteLineAsync("Hello, World! This file is created programmatically!");
            }

        }
        catch (Exception)
        {
            // ignored
        }

        // Get a reference to a blob
        string blobName = "FolderProgramatically/" + Guid.NewGuid().ToString() + ".txt"; //the blobName can be anything
        BlobClient blobClient = containerClient.GetBlobClient(blobName);

        Console.WriteLine("Uploading to Blob storage as blob:\n\t {0}\n", blobClient.Uri);

        // Upload data from the local file
        await blobClient.UploadAsync(localFilePath, true);

        return Content("Check your Blob Storage to see your new file!");
    }

}