/// <summary>
/// Raised AFTER MSAL added the new token in its in-memory copy of the cache.
/// This notification is called every time MSAL accessed the cache, not just when a write took place:
/// If MSAL's current operation resulted in a cache change, the property TokenCacheNotificationArgs.HasStateChanged will be set to true.
/// If that is the case, we call the TokenCache.Serialize() to get a binary blob representing the latest cache content – and persist it.
/// </summary>
/// <param name="args">Contains parameters used by the MSAL call accessing the cache.</param>
private void UserTokenCacheAfterAccessNotification(TokenCacheNotificationArgs args)
{
SetSignedInUserFromNotificationArgs(args);
// if state changed, i.e. new token obtained
if (args.HasStateChanged && !string.IsNullOrWhiteSpace(GetSignedInUsersUniqueId()))
{
if (_inMemoryCache == null)
{
_inMemoryCache = new UserTokenCache
{
WebUserUniqueId = GetSignedInUsersUniqueId()
};
}
_inMemoryCache.CacheBits = _dataProtector.Protect(_userTokenCache.SerializeMsalV3());
_inMemoryCache.LastWrite = DateTime.Now;
try
{
// Update the DB and the lastwrite
_tokenCacheDb.Entry(_inMemoryCache).State = _inMemoryCache.UserTokenCacheId == 0
? EntityState.Added
: EntityState.Modified;
_tokenCacheDb.SaveChanges();
}
catch (DbUpdateConcurrencyException)
{
// Record already updated on a different thread, so just read the updated record
ReadCacheForSignedInUser();
}
}
}
