/// <summary>
/// Creates a new ThumborImage which uses the provided parameters to create either a
/// signed or unsigned URL with filters and other thumbor options
/// </summary>
/// <param name="thumborSigner">Implementation of IThumborSigner for signing keys</param>
/// <param name="thumborServerUrl">URL to the thumbor server EG http://mythumborserver.com/ </param>
/// <param name="thumborSecretKey">The secret key used by the thumbor server for signing URL's</param>
/// <param name="imageUrl">URL to the image that will be manipulated by Thumbor</param>
public ThumborImage(ThumborSigner thumborSigner, Uri thumborServerUrl, string thumborSecretKey, string imageUrl)
{
this.imageUrl = imageUrl;
this.thumborSigner = thumborSigner;
this.thumborSecretKey = thumborSecretKey;
this.thumborServerUrl = thumborServerUrl;
}
/// <summary>
/// Given pregenerated thumbor image parameters return URL to the image with signed key if one exists.
/// NB should not include the leading /
/// </summary>
/// <param name="imageUrl">The image to produce the URL for EG. trim/100x200/filters:grayscale()/http://myserver/myimage.jpg </param>
/// <returns>String containing the URL with the signed image.</returns>
public string BuildSignedUrl(string imageUrl)
{
if (string.IsNullOrEmpty(this.thumborSecretKey))
{
return(string.Format("{0}unsafe{1}", this.thumborServerUrl, imageUrl));
}
var thumborSigner = new ThumborSigner();
var signedKey = thumborSigner.Encode(imageUrl, this.thumborSecretKey);
return(string.Format("/{0}/{1}", signedKey, imageUrl));
}