public async Task Invoke(HttpContext context)
{
if (!_hasProvider)
{
await _next(context);
return;
}
try
{
TokenInfo tokenInfo;
if (context.Request.Headers.ContainsKey("Authorization"))
{
if (context.Request.Headers.TryGetValue("Authorization", out var authzValue) && authzValue.Any(value => value.Contains("Basic")))
{
// Add Telemetry.
using (var activity = _activitySource?.StartActivity("BasicAuthentication", ActivityKind.Producer))
{
var cacheKey = BuildKey(authzValue);
tokenInfo = _tokenCache?.Get <TokenInfo>(cacheKey);
if (null == tokenInfo || tokenInfo.ExpiresOnUtc < DateTime.UtcNow.AddMinutes(1))
{
var credential = GetCredential(authzValue);
if (null != credential && credential.CredentialsEntered)
{
// Get an Access Token.
tokenInfo = await _provider.GetTokenAsync(_option.Settings, credential);
_tokenCache?.Put(cacheKey, tokenInfo);
}
}
if (null != tokenInfo)
{
// Replace the Basic Authorization by the access token in the header.
var authorization = new AuthenticationHeaderValue("Bearer", tokenInfo.AccessToken).ToString();
context.Request.Headers.Remove("Authorization");
context.Request.Headers.Add("Authorization", authorization);
}
}
}
}
}
catch (Exception ex)
{
_logger.Technical().Exception(ex).Log();
}
await _next(context);
}
private void AfterAccessNotification(TokenCacheNotificationArgs args)
{
if (HasStateChanged)
{
Logger.Technical().From <Cache>().System($"Adding token information to the cache for the identifier: {_identifier}.").Log();
TokenCache.Put(_identifier, SerializeAdalV3());
Logger.Technical().From <Cache>().System($"Added token information to the cache for the identifier: {_identifier}.").Log();
HasStateChanged = false;
}
}
public async Task <TokenInfo> GetTokenAsync(IKeyValueSettings settings, CredentialsResult credential)
{
var messages = GetContext(settings, out string clientId, out string authority, out string authenticationType, out string serviceApplicationId);
if (String.IsNullOrWhiteSpace(credential.Upn))
{
messages.Add(new Message(ServiceModel.MessageCategory.Technical, ServiceModel.MessageType.Warning, "No Username is provided."));
}
if (String.IsNullOrWhiteSpace(credential.Password))
{
messages.Add(new Message(ServiceModel.MessageCategory.Technical, ServiceModel.MessageType.Warning, "No password is provided."));
}
messages.LogAndThrowIfNecessary(this);
messages.Clear();
if (null != TokenCache)
{
// Get a HashCode from the password so a second call with the same upn but with a wrong password will not be impersonated due to
// the lack of password check.
var cacheKey = BuildKey(credential, authority, serviceApplicationId);
Logger.Technical().From <CredentialTokenCacheTokenProvider>().System($"Check if the cache contains a token for {cacheKey}.").Log();
var tokenInfo = TokenCache.Get <TokenInfo>(cacheKey);
var hasChanged = false;
if (null != tokenInfo)
{
Logger.Technical().From <CredentialTokenCacheTokenProvider>().System($"Token loaded from the cache for {cacheKey}.").Log();
if (tokenInfo.ExpiresOnUtc < DateTime.UtcNow.AddMinutes(1))
{
Logger.Technical().From <CredentialTokenCacheTokenProvider>().System($"Token is expired for {cacheKey}.").Log();
// We need to refresh the token.
tokenInfo = await CreateBasicTokenInfoAsync(settings, credential);
hasChanged = true;
}
}
else
{
Logger.Technical().From <CredentialTokenCacheTokenProvider>().System($"Contact the STS to create an access token for {cacheKey}.").Log();
tokenInfo = await CreateBasicTokenInfoAsync(settings, credential);
hasChanged = true;
}
if (hasChanged)
{
try
{
Logger.Technical().From <CredentialTokenCacheTokenProvider>().System($"Save the token in the cache for {cacheKey}, will expire at {tokenInfo.ExpiresOnUtc} Utc.").Log();
TokenCache.Put(cacheKey, tokenInfo);
}
catch (Exception ex)
{
Logger.Technical().From <CredentialTokenCacheTokenProvider>().Exception(ex).Log();
}
}
return(tokenInfo);
}
// no cache, do a direct call on every calls.
Logger.Technical().From <CredentialTokenCacheTokenProvider>().System($"No cache is defined. STS is called for every call.").Log();
return(await CreateBasicTokenInfoAsync(settings, credential));
}
