private async Task <Image> LoadFromGitHubAsync(string imageFileName, string email, int imageSize)
{
string imageUrl = null;
try
{
int suffixPosition = email.IndexOf(GitHubPrivateEmailSuffix, StringComparison.OrdinalIgnoreCase);
string username = email.Substring(0, suffixPosition);
var client = new Git.hub.Client();
var user = client.GetUser(username);
if (!string.IsNullOrEmpty(user?.AvatarUrl))
{
var builder = new UriBuilder(user.AvatarUrl);
var query = new StringBuilder(builder.Query.TrimStart('?'));
query.Append(query.Length == 0 ? "?" : "&");
query.AppendFormat("s={0}", imageSize);
builder.Query = query.ToString();
imageUrl = builder.Uri.AbsoluteUri;
}
}
catch (Exception ex)
{
Trace.WriteLine(ex.Message);
}
if (string.IsNullOrEmpty(imageUrl))
{
return(null);
}
return(await DownloadImage(new Uri(imageUrl), imageFileName));
}
private async Task <Uri> BuildAvatarUri([NotNull] string email, string name, int imageSize)
{
var match = _gitHubEmailRegex.Match(email);
if (match.Success)
{
// email is an @users.noreply.github.com address
var username = match.Groups["username"].Value;
// For real users we can directly access the avatar by using
// https://avatars.githubusercontent.com/{encodedUsername}?s={imageSize}
// But for bots this doesn't work. To get the avatar url we can make use of the
// GitHub API to get the profile (which includes the avatar url) but for unauthenticated
// requests the rate limits are pretty low (60 requests per hour)
// To mitigate the issue of possibly hitting the rate limit, we directly load the avatars
// for all "normal" users and only users that can't be resolved that way (like bots)
// query the GitHub profile first.
// GitHub user names can't contain square brackets but bots use them.
var isBot = username.IndexOf('[') >= 0;
if (isBot)
{
var client = new Git.hub.Client();
var userProfile = await client.GetUserAsync(username);
if (string.IsNullOrEmpty(userProfile?.AvatarUrl))
{
return(null);
}
var builder = new UriBuilder(userProfile.AvatarUrl);
var query = new StringBuilder(builder.Query.TrimStart('?'));
query.Append(query.Length == 0 ? "?" : "&");
query.Append("s=").Append(imageSize);
builder.Query = query.ToString();
return(builder.Uri);
}
else
{
var encodedUsername = HttpUtility.UrlEncode(match.Groups["username"].Value);
return(new Uri($"https://avatars.githubusercontent.com/{encodedUsername}?s={imageSize}"));
}
}
else
{
// regular email address
if (_onlySupplyNoReply)
{
return(null);
}
var encodedEmail = HttpUtility.UrlEncode(email);
return(new Uri($"https://avatars.githubusercontent.com/u/e?email={encodedEmail}&s={imageSize}"));
}
}
