/// <summary>
/// Builds a Facebook canvas return URL.
/// </summary>
/// <param name="pathAndQuery">The path and query.</param>
/// <returns>
/// The canvas url.
/// </returns>
public Uri BuildCanvasUrl(string pathAndQuery)
{
Contract.Requires(!String.IsNullOrEmpty(pathAndQuery));
Contract.Ensures(Contract.Result <Uri>() != null);
pathAndQuery = FacebookUtils.RemoveStartingSlash(pathAndQuery);
var canvasUrl = IsSecureConnection ? SecureCanvasUrl : CanvasUrl;
if (canvasUrl.PathAndQuery != "/" && pathAndQuery.StartsWith(canvasUrl.PathAndQuery))
{
pathAndQuery = pathAndQuery.Substring(canvasUrl.PathAndQuery.Length);
}
var url = string.Concat(canvasUrl, pathAndQuery);
return(new Uri(FacebookUtils.RemoveTrailingSlash(url)));
}