private string IssueAuthenticationToken(string username, string password)
{
byte[] buffer = new byte[9];
// Generate the selector for the token
Random.GetBytes(buffer);
string selector = Convert.ToBase64String(buffer);
// Generate the validator for the token
Random.GetBytes(buffer);
string validator = Convert.ToBase64String(buffer);
// Determine where the credential cache is located
ConfigurationFile configFile = ConfigurationFile.Current;
CategorizedSettingsElementCollection systemSettings = configFile.Settings["systemSettings"];
string configurationCachePath = systemSettings["ConfigurationCachePath"].Value;
string credentialCachePath = Path.Combine(configurationCachePath, "CredentialCache.bin");
// Open the credential cache
lock (s_credentialCacheLock)
{
using (FileBackedDictionary <string, Credential> credentialCache = new FileBackedDictionary <string, Credential>(credentialCachePath))
{
// Clean out expired credentials before issuing a new one
DateTime now = DateTime.UtcNow;
List <string> expiredSelectors = credentialCache
.Where(kvp => now >= kvp.Value.Expiration)
.Select(kvp => kvp.Key)
.ToList();
foreach (string expiredSelector in expiredSelectors)
{
credentialCache.Remove(expiredSelector);
}
credentialCache.Compact();
// Enter the new token into the credential cache
credentialCache[selector] = new Credential
{
Validator = validator,
Username = username,
Password = password,
Expiration = DateTime.UtcNow.AddDays(30.0D)
};
}
}
return($"{selector}:{validator}");
}