BlobStorageService.cs

// <copyright file="BlobStorageService.cs" company="Automate The Planet Ltd.">
// Copyright 2021 Automate The Planet Ltd.
// Unauthorized copying of this file, via any medium is strictly prohibited
// Proprietary and confidential
// </copyright>
// <author>Anton Angelov</author>
// <site>https://bellatrix.solutions/</site>

using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;

namespace Bellatrix.Cloud.Infrastructure.Blob
{
    public class BlobStorageService
    {
        private string _connectionString;

        public BlobStorageService(string connectionString = null)
        {
            _connectionString = connectionString ?? Environment.GetEnvironmentVariable("AZURE_BOT_STORAGE_CONNECTION_STRING");
        }

        public string DownloadFileAsText(string fileName, string blobContainerName = "")
        {
            var storageAccount = CloudStorageAccount.Parse(_connectionString);
            var blobClient = storageAccount.CreateCloudBlobClient();

            // Get Blob Container
            var container = blobClient.GetContainerReference(blobContainerName);

            // Get reference to blob (binary content)
            var pageBlob = container.GetBlobReference(fileName);
            var resultText = string.Empty;
            using (var ms = new MemoryStream())
            {
                pageBlob.DownloadToStreamAsync(ms).Wait();
                resultText = Encoding.UTF8.GetString(ms.ToArray());
            }

            return resultText;
        }

        public async Task<string> UploadHtmlFileAsync(string content, string fileName, string blobContainerName = "")
        {
            var storageAccount = CloudStorageAccount.Parse(_connectionString);
            var blobClient = storageAccount.CreateCloudBlobClient();
            var container = blobClient.GetContainerReference(blobContainerName);
            var pageBlob = container.GetBlockBlobReference($"{fileName}_{Guid.NewGuid()}.html");
            pageBlob.Properties.ContentType = "text/html";
            await pageBlob.UploadTextAsync(content);

            return pageBlob.Uri.AbsoluteUri;
        }   
    }
}