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captcha.d
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captcha.d
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/* Copyright (C) 2012 Vladimir Panteleev <[email protected]>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
module captcha;
class Captcha
{
/// Get a HTML fragment to insert into the HTML form to present a challenge to the user.
/// If showing the form again in response to a wrong CAPTCHA solution,
/// the error data passed to the verify handler should be supplied.
abstract string getChallengeHtml(CaptchaErrorData error = null);
/// Check whether a CAPTCHA attempt is included in the form
/// (check for the presence of fields added by getChallengeHtml).
abstract bool isPresent(string[string] fields);
/// Verify the correctness of the user's CAPTCHA solution.
/// handler can be called asynchronously.
abstract void verify(string[string] fields, string ip, void delegate(bool success, string errorMessage, CaptchaErrorData errorData) handler);
}
/// Opaque class for preserving error data.
class CaptchaErrorData
{
}
Captcha theCaptcha;