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// SparkleShare, a collaboration and sharing tool.
// Copyright (C) 2010 Hylke Bons <hi@planetpeanut.uk>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
using System;
using System.IO;
using System.Collections.Generic;
using System.Net;
using System.Net.Mime;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using Sparkles;
namespace SparkleShare
{
public static class Avatars
{
static List<string> skipped_avatars = new List<string> ();
public static string GetAvatar (string email, int size, string target_path)
{
#if __MonoCS__
ServicePointManager.ServerCertificateValidationCallback = GetAvatarValidationCallBack;
#endif
email = email.ToLower ();
if (skipped_avatars.Contains (email))
return null;
string avatars_path = Path.Combine (Path.GetDirectoryName (target_path), "avatars", size + "x" + size);
// Search avatars by file name, ignore extension
// Delete files over a day old
// Return first matching file
if (Directory.Exists (avatars_path)) {
foreach (string file_path in Directory.GetFiles (avatars_path, email.MD5 () + "*")) {
if (new FileInfo (file_path).LastWriteTime < DateTime.Now.AddDays (-1))
File.Delete (file_path);
else
return file_path;
}
}
string avatar_file_path;
try {
avatar_file_path = Path.Combine (avatars_path, email.MD5 ());
} catch (InvalidOperationException e) {
Logger.LogInfo ("Avatars", "Error fetching avatar for " + email, e);
return null;
}
var client = new WebClient ();
string url = "https://gravatar.com/avatar/" + email.MD5 () + ".png?s=" + size + "&d=404";
try {
byte [] buffer = client.DownloadData (url);
if (client.ResponseHeaders ["content-type"].Equals (MediaTypeNames.Image.Jpeg, StringComparison.InvariantCultureIgnoreCase)) {
avatar_file_path += ".jpg";
} else if (client.ResponseHeaders ["content-type"].Equals (MediaTypeNames.Image.Gif, StringComparison.InvariantCultureIgnoreCase)) {
avatar_file_path += ".gif";
} else {
avatar_file_path += ".png";
}
if (buffer.Length > 255) {
if (!Directory.Exists (avatars_path)) {
Directory.CreateDirectory (avatars_path);
Logger.LogInfo ("Avatars", "Created '" + avatars_path + "'");
}
File.WriteAllBytes (avatar_file_path, buffer);
Logger.LogInfo ("Avatars", "Fetched " + size + "x" + size + " avatar for " + email);
return avatar_file_path;
} else {
return null;
}
} catch (Exception e) {
Logger.LogInfo ("Avatars", "Error fetching avatar for " + email, e);
skipped_avatars.Add (email);
return null;
}
}
private static bool GetAvatarValidationCallBack (Object sender,
X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
X509Certificate2 certificate2 = new X509Certificate2 (certificate.GetRawCertData ());
// On some systems (mostly Linux) we can't assume the needed certificates are
// available, so we have to check the certificate's SHA-1 fingerprint manually.
//
// SHA1 fingerprinter obtained from https://www.gravatar.com/ on Oct 16 2015
// Set to expire on Oct 14 2018
string gravatar_cert_fingerprint = "1264B3F00814C6077D3853238771EE67FB6321C9";
if (!certificate2.Thumbprint.Equals (gravatar_cert_fingerprint)) {
Logger.LogInfo ("Avatars", "Invalid certificate for https://www.gravatar.com/");
return false;
}
return true;
}
}
}
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