/// <summary>
/// Gets a temporary bearer token for an application. Refreshes the token as required.
/// </summary>
public string GetApplicationBearerToken()
{
const int TOKEN_EXPIRY_GRACE_SECONDS = 60;
const string grantType = "client_credentials";
lock (_lock)
{
if (string.IsNullOrEmpty(_applicationBearerToken) ||
_tPaasTokenExpiryUtc < DateTime.UtcNow)
{
var customHeaders = new HeaderDictionary
{
{ HeaderConstants.ACCEPT, ContentTypeConstants.ApplicationJson },
{ HeaderConstants.CONTENT_TYPE, ContentTypeConstants.ApplicationFormUrlEncoded },
{ HeaderConstants.AUTHORIZATION, string.Format($"Basic {_configuration.GetValueString("TPAAS_APP_TOKENKEYS")}") }
};
TPaasOauthResult tPaasOauthResult;
try
{
//Revoke expired or expiring token
if (!string.IsNullOrEmpty(_applicationBearerToken))
{
var revokeResult = _tpaas.RevokeApplicationBearerToken(_applicationBearerToken, customHeaders).WaitAndUnwrapException();
if (revokeResult.Code != 0)
{
_log.LogInformation($"GetApplicationBearerToken failed to revoke token: {revokeResult.Message}");
throw new ServiceException(HttpStatusCode.InternalServerError,
new ContractExecutionResult(ContractExecutionStatesEnum.InternalProcessingError,
$"Failed to revoke application bearer token: {revokeResult.Message}"));
}
_applicationBearerToken = null;
_tPaasTokenExpiryUtc = DateTime.MinValue;
}
//Authenticate to get a token
tPaasOauthResult = _tpaas.GetApplicationBearerToken(grantType, customHeaders).WaitAndUnwrapException();
var tPaasUrl = _configuration.GetValueString("TPAAS_OAUTH_URL") ?? "null";
_log.LogInformation(
$"GetApplicationBearerToken() Got new bearer token: TPAAS_OAUTH_URL: {tPaasUrl} grantType: {grantType} customHeaders: {customHeaders.LogHeaders(_logMaxChar)}");
}
catch (Exception e)
{
var message =
string.Format($"GetApplicationBearerToken call to endpoint failed with exception {e.Message}");
throw new ServiceException(HttpStatusCode.InternalServerError,
new ContractExecutionResult(ContractExecutionStatesEnum.InternalProcessingError,
message));
}
if (tPaasOauthResult.Code != 0)
{
var message =
string.Format($"GetApplicationBearerToken call failed with exception {tPaasOauthResult.Message}");
throw new ServiceException(HttpStatusCode.InternalServerError,
new ContractExecutionResult(ContractExecutionStatesEnum.InternalProcessingError,
message));
}
_applicationBearerToken = tPaasOauthResult.tPaasOauthRawResult.access_token;
_tPaasTokenExpiryUtc = DateTime.UtcNow.AddSeconds(tPaasOauthResult.tPaasOauthRawResult.expires_in - TOKEN_EXPIRY_GRACE_SECONDS);
}
_log.LogInformation(
$"GetApplicationBearerToken() Using bearer token: {_applicationBearerToken}");
return(_applicationBearerToken);
}
}
