// Gets an access token. First tries to get the access token from the token cache.
// Using password (secret) to authenticate. Production apps should use a certificate.
public async Task <string> GetUserAccessTokenAsync(string userId)
{
var account = await _app.GetAccountAsync(userId);
if (account == null)
{
throw new ServiceException(new Error
{
Code = "TokenNotFound",
Message = "User not found in token cache. Maybe the server was restarted."
});
}
try
{
var result = await _app.AcquireTokenSilent(_scopes, account).ExecuteAsync();
return(result.AccessToken);
}
// Unable to retrieve the access token silently.
catch (Exception ex)
{
var errorInfo = new Models.ErrorInfo()
{
StatusCode = (int)GraphErrorCode.AuthenticationFailure,
Message = "Caller needs to authenticate. Unable to retrieve the access token silently. " + ex.Message
};
throw new ServiceException(errorInfo.AsGraphError());
}
}
public static Task ErrorOutputResponse(HttpContext httpContext, Models.ErrorInfo result)
{
httpContext.Response.ContentType = "application/json";
var json = new JObject(
new JProperty("status", result.StatusCode),
new JProperty("results", result.ToString())
);
return(httpContext.Response.WriteAsync(json.ToString(Formatting.Indented)));
}
