<?php

/*
 * Created on July 30, 2007
 *
 * API for MediaWiki 1.8+
 *
 * Copyright (C) 2007 Roan Kattouw <Firstname>.<Lastname>@home.nl
 *
 * 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.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * http://www.gnu.org/copyleft/gpl.html
 */

if (!defined('MEDIAWIKI')) {
	// Eclipse helper - will be ignored in production
	require_once ('ApiQueryBase.php');
}

/**
 * Query module to get information about a list of users
 *
 * @ingroup API
 */

 class ApiQueryUsers extends ApiQueryBase {

	public function __construct($query, $moduleName) {
		parent :: __construct($query, $moduleName, 'us');
	}
	
	/**
	 * Get an array mapping token names to their handler functions.
	 * The prototype for a token function is func($user)
	 * it should return a token or false (permission denied)
	 * @return array(tokenname => function)
	 */
	protected function getTokenFunctions() {
		// Don't call the hooks twice
		if(isset($this->tokenFunctions))
			return $this->tokenFunctions;

		// If we're in JSON callback mode, no tokens can be obtained
		if(!is_null($this->getMain()->getRequest()->getVal('callback')))
			return array();

		$this->tokenFunctions = array(
			'userrights' => array( 'ApiQueryUsers', 'getUserrightsToken' ),
		);
		wfRunHooks('APIQueryUsersTokens', array(&$this->tokenFunctions));
		return $this->tokenFunctions;
	}
	
	public static function getUserrightsToken($user)
	{
		global $wgUser;
		// Since the permissions check for userrights is non-trivial,
		// don't bother with it here
		return $wgUser->editToken($user->getName());
	}

	public function execute() {
		$params = $this->extractRequestParams();
		$result = $this->getResult();
		$r = array();

		if (!is_null($params['prop'])) {
			$this->prop = array_flip($params['prop']);
		} else {
			$this->prop = array();
		}

		$users = (array)$params['users'];
		$goodNames = $done = array();
		$result = $this->getResult();
		// Canonicalize user names
		foreach($users as $u) {
			$n = User::getCanonicalName($u);
			if($n === false || $n === '')
			{
				$vals = array('name' => $u, 'invalid' => '');
				$fit = $result->addValue(array('query', $this->getModuleName()),
						null, $vals);
				if(!$fit)
				{
					$this->setContinueEnumParameter('users',
							implode('|', array_diff($users, $done)));
					$goodNames = array();
					break;
				}
				$done[] = $u;
			}
			 else
				$goodNames[] = $n;
		}
		if(count($goodNames))
		{
			$db = $this->getDb();
			$this->addTables('user', 'u1');
			$this->addFields('u1.*');
			$this->addWhereFld('u1.user_name', $goodNames);

			if(isset($this->prop['groups'])) {
				$this->addTables('user_groups');
				$this->addJoinConds(array('user_groups' => array('LEFT JOIN', 'ug_user=u1.user_id')));
				$this->addFields('ug_group');
			}
			if(isset($this->prop['blockinfo'])) {
				$this->addTables('ipblocks');
				$this->addTables('user', 'u2');
				$u2 = $this->getAliasedName('user', 'u2');
				$this->addJoinConds(array(
					'ipblocks' => array('LEFT JOIN', 'ipb_user=u1.user_id'),
					$u2 => array('LEFT JOIN', 'ipb_by=u2.user_id')));
				$this->addFields(array('ipb_reason', 'u2.user_name AS blocker_name'));
			}

			$data = array();
			$res = $this->select(__METHOD__);
			while(($r = $db->fetchObject($res))) {
				$user = User::newFromRow($r);
				$name = $user->getName();
				$data[$name]['name'] = $name;
				if(isset($this->prop['editcount']))
					$data[$name]['editcount'] = intval($user->getEditCount());
				if(isset($this->prop['registration']))
					$data[$name]['registration'] = wfTimestampOrNull(TS_ISO_8601, $user->getRegistration());
				if(isset($this->prop['groups']) && !is_null($r->ug_group))
					// This row contains only one group, others will be added from other rows
					$data[$name]['groups'][] = $r->ug_group;
				if(isset($this->prop['blockinfo']) && !is_null($r->blocker_name)) {
					$data[$name]['blockedby'] = $r->blocker_name;
					$data[$name]['blockreason'] = $r->ipb_reason;
				}
				if(isset($this->prop['emailable']) && $user->canReceiveEmail())
					$data[$name]['emailable'] = '';

				if(isset($this->prop['gender'])) {
					$gender = $user->getOption( 'gender' );
					if ( strval( $gender ) === '' ) {
						$gender = 'unknown';
					}
					$data[$name]['gender'] = $gender;
				}

				if(!is_null($params['token']))
				{
					$tokenFunctions = $this->getTokenFunctions();
					foreach($params['token'] as $t)
					{
						$val = call_user_func($tokenFunctions[$t], $user);
						if($val === false)
							$this->setWarning("Action '$t' is not allowed for the current user");
						else
							$data[$name][$t . 'token'] = $val;
					}
				}
			}
		}
		// Second pass: add result data to $retval
		foreach($goodNames as $u) {
			if(!isset($data[$u]))
				$data[$u] = array('name' => $u, 'missing' => '');
			else {
				if(isset($this->prop['groups']) && isset($data[$u]['groups']))
					$this->getResult()->setIndexedTagName($data[$u]['groups'], 'g');
			}
			$fit = $result->addValue(array('query', $this->getModuleName()),
					null, $data[$u]);
			if(!$fit)
			{
				$this->setContinueEnumParameter('users',
						implode('|', array_diff($users, $done)));
				break;
			}
			$done[] = $u;
		}
		return $this->getResult()->setIndexedTagName_internal(array('query', $this->getModuleName()), 'user');
	}

	public function getAllowedParams() {
		return array (
			'prop' => array (
				ApiBase :: PARAM_DFLT => NULL,
				ApiBase :: PARAM_ISMULTI => true,
				ApiBase :: PARAM_TYPE => array (
					'blockinfo',
					'groups',
					'editcount',
					'registration',
					'emailable',
					'gender',
				)
			),
			'users' => array(
				ApiBase :: PARAM_ISMULTI => true
			),
			'token' => array(
				ApiBase :: PARAM_TYPE => array_keys($this->getTokenFunctions()),
				ApiBase :: PARAM_ISMULTI => true
			),
		);
	}

	public function getParamDescription() {
		return array (
			'prop' => array(
				'What pieces of information to include',
				'  blockinfo    - tags if the user is blocked, by whom, and for what reason',
				'  groups       - lists all the groups the user belongs to',
				'  editcount    - adds the user\'s edit count',
				'  registration - adds the user\'s registration timestamp',
				'  emailable    - tags if the user can and wants to receive e-mail through [[Special:Emailuser]]',
				'  gender       - tags the gender of the user. Returns "male", "female", or "unknown"',
			),
			'users' => 'A list of users to obtain the same information for',
			'token' => 'Which tokens to obtain for each user',
		);
	}

	public function getDescription() {
		return 'Get information about a list of users';
	}

	protected function getExamples() {
		return 'api.php?action=query&list=users&ususers=brion|TimStarling&usprop=groups|editcount|gender';
	}

	public function getVersion() {
		return __CLASS__ . ': $Id$';
	}
}