<?php
/**
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 */

/**
 * Validate an OATH token.
 *
 * @ingroup API
 * @ingroup Extensions
 */
class ApiOATHValidate extends ApiBase {
	public function execute() {
		// Be extra paranoid about the data that is sent
		$this->requirePostedParameters( [ 'totp', 'token' ] );

		$params = $this->extractRequestParams();
		if ( $params['user'] === null ) {
			$params['user'] = $this->getUser()->getName();
		}

		if ( !$this->getUser()->isAllowed( 'oathauth-api-all' ) ) {
			$this->dieUsage(
				'You do not have permission to validate an OATH token',
				'permissiondenied'
			);
		}

		$user = User::newFromName( $params['user'] );
		if ( $user === false ) {
			$this->dieUsageMsg( [ 'noname', $params['user'] ] );
		}

		// Don't increase pingLimiter, just check for limit exceeded.
		if ( $user->pingLimiter( 'badoath', 0 ) ) {
			$this->dieUsageMsg( 'actionthrottledtext' );
		}

		$result = [
			ApiResult::META_BC_BOOLS => [ 'enabled', 'valid' ],
			'enabled' => false,
			'valid' => false,
		];

		if ( !$user->isAnon() ) {
			$oathUser = OATHAuthHooks::getOATHUserRepository()
				->findByUser( $user );
			if ( $oathUser ) {
				$key = $oathUser->getKey();
				if ( $key !== null ) {
					$result['enabled'] = true;
					$result['valid'] = $key->verifyToken(
						$params['totp'], $oathUser ) !== false;
				}
			}
		}

		$this->getResult()->addValue( null, $this->getModuleName(), $result );
	}

	public function getCacheMode( $params ) {
		return 'private';
	}

	public function isInternal() {
		return true;
	}

	public function needsToken() {
		return 'csrf';
	}

	public function getAllowedParams() {
		return [
			'user' => [
				ApiBase::PARAM_TYPE => 'user',
			],
			'totp' => [
				ApiBase::PARAM_TYPE => 'string',
				ApiBase::PARAM_REQUIRED => true,
			],
		];
	}

	protected function getExamplesMessages() {
		return [
			'action=oathvalidate&totp=123456&token=123ABC'
				=> 'apihelp-oath-example-1',
			'action=oathvalidate&user=Example&totp=123456&token=123ABC'
				=> 'apihelp-oath-example-2',
		];
	}
}