///<exception cref="BadCropArgumentsException"/>
///<exception cref="CropZeroSizeException"/>
public static CropArgs ExtractCropArguments(string url)
{
string argsAsOne = ExtractCropArgumentsAsOne(url);
CropArgs argsIndividual = ExtractCropArgumentsIndividual(argsAsOne);
if (argsIndividual.width == 0 || argsIndividual.height == 0)
{
throw new CropZeroSizeException();
}
return(argsIndividual);
}
private static CropArgs ExtractCropArgumentsIndividual(string cropArgsAsOne)
{
Regex regexForIndividualArgs = new Regex(@"-?[0-9]+");
MatchCollection matchCollection = regexForIndividualArgs.Matches(cropArgsAsOne);
CropArgs cropArgs = new CropArgs();
cropArgs.x = Convert.ToInt32(matchCollection[0].Value);
cropArgs.y = Convert.ToInt32(matchCollection[1].Value);
cropArgs.width = Convert.ToInt32(matchCollection[2].Value);
cropArgs.height = Convert.ToInt32(matchCollection[3].Value);
return(cropArgs);
}
protected override void HandleContext(HttpListenerContext listenerContext)
{
string url = listenerContext.Request.Url.ToString();
try
{
// Transform image
string transformName = UrlPartsExtractor.ExtractTransformName(url);
Image imageFromRequest = HttpImageExtractor.ExtractImage(listenerContext,
imageMaxSizeConstraint,
imageMaxWidthConstraint,
imageMaxHeightConstraint);
Image transformedImage = ImageTransformer.TransformImage(imageFromRequest, transformName);
// Crop image
CropArgs cropArgs = UrlPartsExtractor.ExtractCropArguments(url);
Image croppedImage = ImageTransformer.CropImage(transformedImage,
cropArgs.x,
cropArgs.y,
cropArgs.width,
cropArgs.height);
RespondWithOK(listenerContext.Response, croppedImage);
}
catch (Exception e)
{
if (e is NoTransformNameException ||
e is BadImageException ||
e is UnknownTransformException ||
e is BadCropArgumentsException ||
e is CropZeroSizeException)
{
RespondWithError(listenerContext.Response, BAD_REQUEST);
}
else if (e is EmptyIntersectionException)
{
RespondWithError(listenerContext.Response, NO_CONTENT);
}
else
{
RespondWithError(listenerContext.Response, INTERNAL_SERVER_ERROR);
}
return;
}
}
