Clearing ImageProcessor Cache in Azure

How do you clear ImageProcessor thumbnails in Azure ImageProcessor Cache

Answer

Here is the code that is a service that I call on IContentPublishing Event

public void PublishingContent(object sender, ContentEventArgs e)
        {
            if (ConfigurationManager.AppSettings.Get("episerver:EnvironmentName").HasValue())
            {
                var enviroment = ServiceLocator.Current.GetInstance<DxcApplicationContext>();
                if (enviroment.CurrentEnvironment == DxcEnvironment.Integration || enviroment.CurrentEnvironment == DxcEnvironment.Preproduction || enviroment.CurrentEnvironment == DxcEnvironment.Production)
                {
                    if (e.Content is ImageFile imageFile)
                    {
                        var provider = new AzureThumbnailCleanerService();
                        provider.DeleteThumbnails(imageFile);
                    }
                }
            }
        }

This is the service that handles the deleting of thumbnails

using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;

[ServiceConfiguration(FactoryType = typeof(AzureThumbnailCleanerService), Lifecycle = ServiceInstanceScope.Singleton)]
    public class AzureThumbnailCleanerService
    {
        private static CloudBlobContainer rootContainer;

        public AzureThumbnailCleanerService()
        {
            string providerName = EPiServerFrameworkSection.Instance.Blob.DefaultProvider;

            if (rootContainer == null)
            {
                // Get the name of the connection string from there
                string connectionStringName = EPiServerFrameworkSection.Instance.Blob.Providers[providerName].Parameters["connectionStringName"];

                // Get storage account from connection string.
                CloudStorageAccount cloudCachedStorageAccount = CloudStorageAccount.Parse(ConfigurationManager.ConnectionStrings[connectionStringName].ConnectionString);
                // Create the blob client.
                CloudBlobClient cloudBlobClient = cloudCachedStorageAccount.CreateCloudBlobClient();

                // Retrieve reference to the container. Container is already created as part of the initialization process for the BlobProvider
                rootContainer = cloudBlobClient.GetContainerReference(EPiServerFrameworkSection.Instance.Blob.Providers[providerName].Parameters["container"]);
            }
        }

        public void DeleteThumbnails(ImageFile media)
        {
            string containerName = media?.BinaryDataContainer?.Segments[1];
            CloudBlockBlob directory = rootContainer.GetBlockBlobReference(containerName);
            // Get list of directories based on media data
            var items = rootContainer.ListBlobs(directory.Name);
            if (items.HasValue())
            {
                // Loop the blobs and see if it is a cloud directory.
                foreach (var item in items)
                {
                    if (item is CloudBlobDirectory cloudDirectory)
                    {
                        // YES SIR!!!!
                        // get blobs
                        var dir = cloudDirectory.ListBlobs(true);
                        var blobs = dir.OfType<CloudBlob>();
                        foreach (var blob in blobs)
                        {
                            // Check for names
                            var paths = blob.Name.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);

                            if (paths.LastOrDefault().Contains("_Thumbnail.jpg") ||
                                paths.LastOrDefault().Contains("_Thumb900x450.jpg") ||
                                paths.LastOrDefault().Contains("_thumb350x175.jpg") ||
                                paths.LastOrDefault().Contains("_Thumb530x450.jpg") ||
                                paths.LastOrDefault().Contains("_thumb2x1.jpg") ||
                                paths.LastOrDefault().Contains("_ThumbMax560.png") ||
                                paths.LastOrDefault().Contains("_Thumb720x360.jpg") ||
                                paths.LastOrDefault().Contains("_thumb767.jpg") ||
                                paths.LastOrDefault().StartsWith("3p!_")) // The lovely file for Imageprocessor
                            {
                                // DEUCES!!!
                                blob.DeleteIfExists();
                                continue;
                            }
                        }
                    }
                }
            }
        }
    }

Here is the code for DXPContext Enviroment

 [ServiceConfiguration(Lifecycle = ServiceInstanceScope.Singleton)]
    public class DxcApplicationContext
    {
        private DxcEnvironment environment;

        public DxcApplicationContext()
        {
            var setting = ConfigurationManager.AppSettings.Get("episerver:EnvironmentName");
            if (!Enum.TryParse(setting, true, out environment))
            {
                //Default environment is integration;
                environment = DxcEnvironment.Integration;
            }
        }

        public DxcEnvironment CurrentEnvironment => environment;
    }

    public enum DxcEnvironment
    {
        Local,

        Integration,

        Preproduction,

        Production
    }