public async Task InvokeAsync(HttpContext context)
{
if (!IsImageRequested(context))
{
await _next(context);
return;
}
var imagePath = GetRequestedImagePath(context);
var fullImagePath = Path.Combine(_storageConfig.Value.RootPath, imagePath);
if (!File.Exists(fullImagePath))
{
context.Response.StatusCode = 404;
return;
}
if (IsThumbnailRequested(context))
{
var size = CreateSizeFromQueryString(context);
fullImagePath = ThumbnailHelper.GenerateThumbnail(fullImagePath, size);
}
await using var fs = new FileStream(fullImagePath, FileMode.Open);
await fs.CopyToAsync(context.Response.Body);
}
public virtual ActionResult Thumbnail(string path, int width, int height, string rotate)
{
try
{
path = StringHelper.TrimWhitespace(HttpUtility.UrlDecode(path));
//NOTE: encode/decode lose double slash
if (path.StartsWith("http:/") && !path.StartsWith("http://"))
{
path = path.Replace("http:/", "http://");
}
if (path.StartsWith("https:/") && !path.StartsWith("https://"))
{
path = path.Replace("https:/", "https://");
}
if (path.StartsWith("http") || path.StartsWith("https"))
{
var fileExt = Path.GetExtension(Models.UrlHelper.RemoveUrlParams(path));
var hash = MD5Utils.GetMD5HashAsString(path) + fileExt;
var thumbnailFile = Server.MapPath("~/Cache/" + "W" + width + "xH" + height + "xR" + rotate + "x" + hash);
if (System.IO.File.Exists(thumbnailFile))
{
return(File(thumbnailFile, "image/png"));
}
LogI("Generate thumbnail from downloading image: " + path);
using (var srcImage = Image.FromStream(ImageHelper.DownloadRemoteImageFileAsStream(path)))
{
ThumbnailHelper.GenerateThumbnail(srcImage,
thumbnailFile,
width,
height,
rotate);
return(File(thumbnailFile,
FileHelper.GetMimeTypeByExt(Path.GetExtension(thumbnailFile))));
}
}
else
{
var imageFile = Models.UrlHelper.GetPathFromRelativeImageUrl(path);
//var imageFile = Server.MapPath(path); // Path.Combine(Server.MapPath("~/App_Data"), path);
//NOTE: for eBay
var fileExt = Path.GetExtension(path);
var filename = FileHelper.PrepareFileName(Path.GetFileNameWithoutExtension(path));
var thumbnailFile = Server.MapPath("~/Cache/" + "W" + width + "xH" + height + "xR" + rotate + "x" + filename + fileExt);
if (System.IO.File.Exists(thumbnailFile))
{
return(File(thumbnailFile, "image/png"));
}
//WebImage img = new WebImage(path).Save();
if (System.IO.File.Exists(imageFile))
{
LogI("Generate thumbnail from local image: " + path);
using (var srcImage = Image.FromFile(imageFile))
{
ThumbnailHelper.GenerateThumbnail(srcImage,
thumbnailFile,
width,
height,
rotate);
}
return(File(thumbnailFile,
FileHelper.GetMimeTypeByExt(Path.GetExtension(thumbnailFile))));
}
}
}
catch (Exception ex)
{
LogE("Unable to display thumbnails", ex);
}
LogI("Display NO_IMAGE_URL for path=" + path);
return(File(Server.MapPath(ImageHelper.NO_IMAGE_URL),
FileHelper.GetMimeTypeByExt(Path.GetExtension(ImageHelper.NO_IMAGE_URL))));
}