public async Task Invoke(HttpContext context, IImageCacheHelper cacheHelper)
{
var imageId = context.Request?.Path.Value.Split('/').Last();
if (context.Request.Path.Value.Contains("image", StringComparison.InvariantCultureIgnoreCase))
{
_cacheHelper.InvalidateCacheIfRequired();
string fileExists = _cacheHelper.TryGetImage(imageId);
if (string.IsNullOrEmpty(fileExists) == false)
{
await context.Response.SendFileAsync($"{ _cacheHelper.CacheFolder}/{ imageId}.{ _cacheHelper.ImageExtension}");
}
else
{
var imagesInCache = _cacheHelper.GetCachedImagesCount();
if (imagesInCache >= _options.MaxImages)
{
await _next(context);
}
else
{
await CacheImageAndProceed(context, imageId);
}
}
}
else
{
await _next(context);
}
}
public ImageCaching(RequestDelegate next, IImageCacheHelper cacheHelper, CachingOptions options)
{
_next = next;
_options = options;
_cacheHelper = cacheHelper;
_cacheHelper.InitCacheOptions(_options);
}
public ImageCachingMiddleware(
RequestDelegate next,
IHostingEnvironment env,
IImageCacheHelper cacheHelper,
CachingOptions options)
{
_next = next;
_options = options;
_cacheHelper = cacheHelper;
_cacheHelper.InitializeCache(_options);
}
