public async Task Invoke(HttpContext context)
{
var path = context.Request.Path;
if (!path.StartsWithSegments("/images", System.StringComparison.OrdinalIgnoreCase) &&
!path.StartsWithSegments("/category/image", System.StringComparison.OrdinalIgnoreCase))
{
await _next(context);
return;
}
var fileName = Path.GetFileName(context.Request.Path.Value);
var content = await _cacheService.GetAsync(fileName);
if (content != null)
{
var contentType = _mimeHelper.GetMimeType(content);
context.Response.ContentType = contentType;
await context.Response.Body.WriteAsync(content);
return;
}
var originalBody = context.Response.Body;
byte[] responseContent;
try
{
using (var memStream = new MemoryStream())
{
context.Response.Body = memStream;
await _next(context);
memStream.Seek(0, SeekOrigin.Begin);
responseContent = memStream.ToArray();
memStream.Seek(0, SeekOrigin.Begin);
await memStream.CopyToAsync(originalBody);
}
}
finally
{
context.Response.Body = originalBody;
}
if (!string.IsNullOrWhiteSpace(context.Response.ContentType) &&
context.Response.ContentType.StartsWith("image"))
{
await _cacheService.AddAsync(fileName, responseContent);
}
}
public async Task <IActionResult> Image(int id)
{
var image = await _categoryService.GetCategoryImageAsync(id);
if (image == null)
{
return(NotFound());
}
return(File(image, _mimeHelper.GetMimeType(image)));
}
