/// <summary>
/// The entry point of the handler. Reads settings and request and processes the image or retrieves it from cache
/// </summary>
/// <param name="context">The context in which the request is done</param>
public void ProcessRequest(HttpContext context)
{
try
{
//Store the context object for other procedures
_context = context;
//Get the format and if only format are alowed and one is not given we can stop here. Also scheck if the format actually exists in the settings
_format = (_context.Request["format"] ?? string.Empty).ToLower();
if ((string.IsNullOrEmpty(_format) && Settings.FormatsOnly) || (!string.IsNullOrEmpty(_format) && !Settings.Formats.Any(f => f.Key.ToLower() == _format)))
{
WriteNotFoundResponse();
return;
}
//resolve the requested file from the servekmage request. (Supports old style serveimage.ashx and new style /image.*)
if (_context.Request.Url.AbsolutePath.StartsWith("/serveimage.ashx"))
{
_requestedFile = _context.Request["path"];
}
else
{
_requestedFile = _context.Request.Url.AbsolutePath.Substring(Settings.PathPrefix.Length); //new
}
//decode the requested file
_requestedFile = HttpUtility.UrlDecode(_requestedFile);
//return 404 if the requested file is null or empty
if (string.IsNullOrEmpty(_requestedFile))
{
WriteNotFoundResponse();
return;
}
//Resolve the requested category or use the default
_category = (_context.Request["cat"] ?? Settings.DefaultCategory).ToLower();
//if a category was given and valid, we add the prefix belonging to the cateogry to the requested file
//otherwise If no category could be determined: return a 404
if (Settings.Categories.ContainsKey(_category))
{
var prefix = Settings.Categories[_category];
if (!_requestedFile.StartsWith(prefix))
{
_requestedFile = prefix + _requestedFile;
}
}
else
{
WriteNotFoundResponse();
return;
}
//Resolve the mimetype of the original file and set the contenttype to default to text/html for now.
var mimeType = Web.GetMimeType(_requestedFile).ToLower();
_context.Response.ContentType = "text/html";
//Check if the cachepath exists
Settings.CheckCachePath(context);
//If the requested file is not a local image we return the file as download (e.g. a document)
if (!Settings.Categories[_category].StartsWith("http") && !mimeType.StartsWith("image"))
{
_cacheFile = _context.Server.MapPath(_requestedFile);
_cacheFileInfo = new FileInfo(_cacheFile);
_serveAsDownload = true;
ServeCacheFile();
//and so we can stop here
return;
}
//Fetching more request params
_enableCache = bool.Parse(_context.Request["cache"] ?? "true");
_retina = bool.Parse(_context.Request["retina"] ?? "false");
_sizeFactor = _retina ? 2 : 1;
_quality = int.Parse(_context.Request["q"] ?? Settings.Quality.ToString());
//Resolve the image manipulation params using the format or the values from the querystring.
var format = new NameValueCollection();
if (Settings.Formats.ContainsKey(_format)) { format = Settings.Formats[_format]; }
_actions = (format["action"] ?? _context.Request["action"] ?? string.Empty).Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
_serveAsDownload = bool.Parse(format["download"] ?? _context.Request["download"] ?? "false");
_constrainProportions = bool.Parse(format["constrain"] ?? _context.Request["constrain"] ?? "true");
_noUpSizing = bool.Parse(format["noupsizing"] ?? _context.Request["noupsizing"] ?? "false");
_cX = int.Parse(format["cx"] ?? _context.Request["cx"] ?? "0") * _sizeFactor;
_cY = int.Parse(format["cy"] ?? _context.Request["cy"] ?? "0") * _sizeFactor;
_cW = int.Parse(format["cw"] ?? _context.Request["cw"] ?? "0") * _sizeFactor;
_cH = int.Parse(format["ch"] ?? _context.Request["ch"] ?? "0") * _sizeFactor;
_rW = int.Parse(format["rw"] ?? _context.Request["rw"] ?? "0") * _sizeFactor;
_rH = int.Parse(format["rh"] ?? _context.Request["rh"] ?? "0") * _sizeFactor;
_fW = int.Parse(format["fw"] ?? _context.Request["fw"] ?? "0") * _sizeFactor;
_fH = int.Parse(format["fh"] ?? _context.Request["fh"] ?? "0") * _sizeFactor;
_bW = int.Parse(format["bw"] ?? _context.Request["bw"] ?? "0") * _sizeFactor;
_bH = int.Parse(format["bh"] ?? _context.Request["bh"] ?? "0") * _sizeFactor;
_mW = int.Parse(format["mw"] ?? _context.Request["mw"] ?? "0") * _sizeFactor;
_mH = int.Parse(format["mh"] ?? _context.Request["mh"] ?? "0") * _sizeFactor;
_bColor = _context.Request[format["bcolor"] ?? "bcolor"] ?? "ffffff";
//Check if it is an external file
_isExternalFile = (_requestedFile.StartsWith("http"));
//If not external: get the local file and run some checks
if (!_isExternalFile)
{
if (MediaProvider != null)
{
var width = (_rW > 0 ? _rW : (_fW > 0 ? _fW : 0)) * (!_retina && Settings.AlwaysUseRetinaAsSource ? 2 : 1);
var height = (_rH > 0 ? _rH : (_fH > 0 ? _fH : 0)) * (!_retina && Settings.AlwaysUseRetinaAsSource ? 2 : 1);
_mediaFile = MediaProvider(_requestedFile, width, height);
}
else
{
_mediaFile = _context.Server.MapPath(_requestedFile);
}
if (string.IsNullOrEmpty(_mediaFile) || !File.Exists(_mediaFile))
{
WriteNotFoundResponse();
return;
}
_mediaFileInfo = new FileInfo(_mediaFile);
}
//Convert to jpg (or png if cutout is used) UNLESS overruled by config
if (!_isExternalFile || new Uri(_requestedFile, UriKind.RelativeOrAbsolute).IsFile)
{
var ext = Path.GetExtension(_requestedFile);
if (_actions.Contains("cutout") && ext != ".png")
{
_convertTo = System.Drawing.Imaging.ImageFormat.Png;
}
else if (ext != ".jpg" && ext != ".jpeg" && !Settings.NoConversion)
{
_convertTo = System.Drawing.Imaging.ImageFormat.Jpeg;
}
}
//Determine the cachefile
_cacheFile = GetCacheFile();
if (_enableCache)
{
// Is this request cached on the client?
if (CheckHttpCache())
{ return; }
// Do we have the requested file in cache?
//media = GetFromCache();
if (CheckDiskCache())
{ return; }
}
// Not in cache it is so loading media file
ImageTransformer media;
if (_isExternalFile)
{
media = new ImageTransformer(_requestedFile, _quality);
}
else
{
media = new ImageTransformer(_mediaFile, _quality);
}
//Convert if needed
if (_convertTo != null)
{
media.ConvertToImageFormat(_convertTo);
}
// Executing actions
// Maximum amount of actions is 5, to prevent memory issues
if (_actions != null && _actions.Length > 0 && _actions.Length <= 5)
{
foreach (String action in _actions)
{
switch (action)
{
case "resize":
media.Resize(new System.Drawing.Size(_rW, _rH), _constrainProportions, _noUpSizing, _mW, _mH);
break;
case "crop":
media.Crop(new System.Drawing.Rectangle(new System.Drawing.Point(_cX, _cY), new System.Drawing.Size(_cW, _cH)));
break;
case "fit":
media.Fit(new System.Drawing.Size(_fW, _fH), _noUpSizing, _mW, _mH);
break;
case "box":
System.Drawing.Color bgColor;
if (_bColor == "transparent") bgColor = System.Drawing.Color.Transparent;
else bgColor = System.Drawing.ColorTranslator.FromHtml("#" + _bColor);
media.Box(new System.Drawing.Size(_bW, _bH), bgColor, _noUpSizing, _mW, _mH);
break;
case "grayscale":
media.Grayscale();
break;
case "sepia":
media.Sepia();
break;
}
}
}
// Cache it!
ToCache(media);
media.Dispose();
// Serve it!
ServeCacheFile();
}
catch (System.IO.FileNotFoundException ex)
{
WriteNotFoundResponse();
return;
}
}
private void ToCache(ImageTransformer media)
{
// Directory checking
if (!System.IO.Directory.Exists(Settings.CachePath)) System.IO.Directory.CreateDirectory(Settings.CachePath);
media.Save(_cacheFile);
_cacheFileInfo = new FileInfo(_cacheFile);
}