/// <summary>
/// Provides a mapping for the image defaults.
/// </summary>
private static string GetDefaultImageString(DefaultImageType defaultImageType)
{
switch (defaultImageType)
{
case DefaultImageType.Identicon: return("identicon");
case DefaultImageType.MonsterId: return("monsterid");
case DefaultImageType.Wavatar: return("wavatar");
case DefaultImageType.Retro: return("retro");
default: return("404");
}
}
private Task <Image> LoadFromGravatarAsync(string imageFileName, string email, int imageSize, DefaultImageType defaultImageType)
{
var imageUrl = BuildGravatarUrl(email, imageSize, false, Rating.G, defaultImageType);
return(DownloadImage(imageUrl, imageFileName));
}
/// <summary>
/// Builds a <see cref="Uri"/> corresponding to a given email address.
/// </summary>
/// <param name="email">The email address for which to build the <see cref="Uri"/>.</param>
/// <param name="size">The size of the image to request. The default is 32.</param>
/// <param name="useHttps">Indicates whether or not the request should be performed over Secure HTTP.</param>
/// <param name="rating">The maximum rating of the returned image.</param>
/// <param name="defaultImageType">The Gravatar service that will be used for fall-back.</param>
/// <returns>The constructed <see cref="Uri"/>.</returns>
private static Uri BuildGravatarUrl(string email, int size, bool useHttps, Rating rating, DefaultImageType defaultImageType)
{
var builder = new UriBuilder("http://www.gravatar.com/avatar/");
if (useHttps)
{
builder.Scheme = "https";
}
builder.Path += HashEmail(email);
var query = string.Format("s={0}&r={1}&d={2}",
size,
rating.ToString().ToLowerInvariant(),
GetDefaultImageString(defaultImageType));
builder.Query = query;
return(builder.Uri);
}
private async Task <Image> LoadFromGravatarAsync(string imageFileName, string email, int imageSize, DefaultImageType defaultImageType)
{
try
{
var imageUrl = BuildGravatarUrl(email, imageSize, false, Rating.G, defaultImageType);
using (var webClient = new WebClient {
Proxy = WebRequest.DefaultWebProxy
})
{
webClient.Proxy.Credentials = CredentialCache.DefaultCredentials;
using (var imageStream = await webClient.OpenReadTaskAsync(imageUrl))
{
await _cache.AddImageAsync(imageFileName, imageStream);
}
return(await _cache.GetImageAsync(imageFileName, null));
}
}
catch (Exception ex)
{
//catch IO errors
Trace.WriteLine(ex.Message);
}
return(null);
}
