<?php
/**
 * Copyright © 2007 Roan Kattouw "<Firstname>.<Lastname>@gmail.com"
 *
 * 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
 *
 * @file
 */

use MediaWiki\MediaWikiServices;
use MediaWiki\ParamValidator\TypeDef\UserDef;
use Wikimedia\IPUtils;
use Wikimedia\Rdbms\IResultWrapper;

/**
 * Query module to enumerate all user blocks
 *
 * @ingroup API
 */
class ApiQueryBlocks extends ApiQueryBase {

	public function __construct( ApiQuery $query, $moduleName ) {
		parent::__construct( $query, $moduleName, 'bk' );
	}

	public function execute() {
		$db = $this->getDB();
		$commentStore = CommentStore::getStore();
		$params = $this->extractRequestParams();
		$this->requireMaxOneParameter( $params, 'users', 'ip' );

		$prop = array_flip( $params['prop'] );
		$fld_id = isset( $prop['id'] );
		$fld_user = isset( $prop['user'] );
		$fld_userid = isset( $prop['userid'] );
		$fld_by = isset( $prop['by'] );
		$fld_byid = isset( $prop['byid'] );
		$fld_timestamp = isset( $prop['timestamp'] );
		$fld_expiry = isset( $prop['expiry'] );
		$fld_reason = isset( $prop['reason'] );
		$fld_range = isset( $prop['range'] );
		$fld_flags = isset( $prop['flags'] );
		$fld_restrictions = isset( $prop['restrictions'] );

		$result = $this->getResult();

		$this->addTables( 'ipblocks' );
		$this->addFields( [ 'ipb_auto', 'ipb_id', 'ipb_timestamp' ] );

		$this->addFieldsIf( [ 'ipb_address', 'ipb_user' ], $fld_user || $fld_userid );
		if ( $fld_by || $fld_byid ) {
			$actorQuery = ActorMigration::newMigration()->getJoin( 'ipb_by' );
			$this->addTables( $actorQuery['tables'] );
			$this->addFields( $actorQuery['fields'] );
			$this->addJoinConds( $actorQuery['joins'] );
		}
		$this->addFieldsIf( 'ipb_expiry', $fld_expiry );
		$this->addFieldsIf( [ 'ipb_range_start', 'ipb_range_end' ], $fld_range );
		$this->addFieldsIf( [ 'ipb_anon_only', 'ipb_create_account', 'ipb_enable_autoblock',
			'ipb_block_email', 'ipb_deleted', 'ipb_allow_usertalk', 'ipb_sitewide' ],
			$fld_flags );
		$this->addFieldsIf( 'ipb_sitewide', $fld_restrictions );

		if ( $fld_reason ) {
			$commentQuery = $commentStore->getJoin( 'ipb_reason' );
			$this->addTables( $commentQuery['tables'] );
			$this->addFields( $commentQuery['fields'] );
			$this->addJoinConds( $commentQuery['joins'] );
		}

		$this->addOption( 'LIMIT', $params['limit'] + 1 );
		$this->addTimestampWhereRange(
			'ipb_timestamp',
			$params['dir'],
			$params['start'],
			$params['end']
		);
		// Include in ORDER BY for uniqueness
		$this->addWhereRange( 'ipb_id', $params['dir'], null, null );

		if ( $params['continue'] !== null ) {
			$cont = explode( '|', $params['continue'] );
			$this->dieContinueUsageIf( count( $cont ) != 2 );
			$op = ( $params['dir'] == 'newer' ? '>' : '<' );
			$continueTimestamp = $db->addQuotes( $db->timestamp( $cont[0] ) );
			$continueId = (int)$cont[1];
			$this->dieContinueUsageIf( $continueId != $cont[1] );
			$this->addWhere( "ipb_timestamp $op $continueTimestamp OR " .
				"(ipb_timestamp = $continueTimestamp AND " .
				"ipb_id $op= $continueId)"
			);
		}

		if ( isset( $params['ids'] ) ) {
			$this->addWhereIDsFld( 'ipblocks', 'ipb_id', $params['ids'] );
		}
		if ( isset( $params['users'] ) ) {
			$usernames = [];
			foreach ( (array)$params['users'] as $u ) {
				$usernames[] = $this->prepareUsername( $u );
			}
			$this->addWhereFld( 'ipb_address', $usernames );
			$this->addWhereFld( 'ipb_auto', 0 );
		}
		if ( isset( $params['ip'] ) ) {
			$blockCIDRLimit = $this->getConfig()->get( 'BlockCIDRLimit' );
			if ( IPUtils::isIPv4( $params['ip'] ) ) {
				$type = 'IPv4';
				$cidrLimit = $blockCIDRLimit['IPv4'];
				$prefixLen = 0;
			} elseif ( IPUtils::isIPv6( $params['ip'] ) ) {
				$type = 'IPv6';
				$cidrLimit = $blockCIDRLimit['IPv6'];
				$prefixLen = 3; // IPUtils::toHex output is prefixed with "v6-"
			} else {
				$this->dieWithError( 'apierror-badip', 'param_ip' );
			}

			# Check range validity, if it's a CIDR
			list( $ip, $range ) = IPUtils::parseCIDR( $params['ip'] );
			if ( $ip !== false && $range !== false && $range < $cidrLimit ) {
				$this->dieWithError( [ 'apierror-cidrtoobroad', $type, $cidrLimit ] );
			}

			# Let IPUtils::parseRange handle calculating $upper, instead of duplicating the logic here.
			list( $lower, $upper ) = IPUtils::parseRange( $params['ip'] );

			# Extract the common prefix to any rangeblock affecting this IP/CIDR
			$prefix = substr( $lower, 0, $prefixLen + floor( $cidrLimit / 4 ) );

			# Fairly hard to make a malicious SQL statement out of hex characters,
			# but it is good practice to add quotes
			$lower = $db->addQuotes( $lower );
			$upper = $db->addQuotes( $upper );

			$this->addWhere( [
				'ipb_range_start' . $db->buildLike( $prefix, $db->anyString() ),
				'ipb_range_start <= ' . $lower,
				'ipb_range_end >= ' . $upper,
				'ipb_auto' => 0
			] );
		}

		if ( $params['show'] !== null ) {
			$show = array_flip( $params['show'] );

			/* Check for conflicting parameters. */
			if ( ( isset( $show['account'] ) && isset( $show['!account'] ) )
				|| ( isset( $show['ip'] ) && isset( $show['!ip'] ) )
				|| ( isset( $show['range'] ) && isset( $show['!range'] ) )
				|| ( isset( $show['temp'] ) && isset( $show['!temp'] ) )
			) {
				$this->dieWithError( 'apierror-show' );
			}

			$this->addWhereIf( 'ipb_user = 0', isset( $show['!account'] ) );
			$this->addWhereIf( 'ipb_user != 0', isset( $show['account'] ) );
			$this->addWhereIf( 'ipb_user != 0 OR ipb_range_end > ipb_range_start', isset( $show['!ip'] ) );
			$this->addWhereIf( 'ipb_user = 0 AND ipb_range_end = ipb_range_start', isset( $show['ip'] ) );
			$this->addWhereIf( 'ipb_expiry = ' .
				$db->addQuotes( $db->getInfinity() ), isset( $show['!temp'] ) );
			$this->addWhereIf( 'ipb_expiry != ' .
				$db->addQuotes( $db->getInfinity() ), isset( $show['temp'] ) );
			$this->addWhereIf( 'ipb_range_end = ipb_range_start', isset( $show['!range'] ) );
			$this->addWhereIf( 'ipb_range_end > ipb_range_start', isset( $show['range'] ) );
		}

		if ( !$this->getPermissionManager()->userHasRight( $this->getUser(), 'hideuser' ) ) {
			$this->addWhereFld( 'ipb_deleted', 0 );
		}

		# Filter out expired rows
		$this->addWhere( 'ipb_expiry > ' . $db->addQuotes( $db->timestamp() ) );

		$res = $this->select( __METHOD__ );

		$restrictions = [];
		if ( $fld_restrictions ) {
			$restrictions = self::getRestrictionData( $res, $params['limit'] );
		}

		$count = 0;
		foreach ( $res as $row ) {
			if ( ++$count > $params['limit'] ) {
				// We've had enough
				$this->setContinueEnumParameter( 'continue', "$row->ipb_timestamp|$row->ipb_id" );
				break;
			}
			$block = [
				ApiResult::META_TYPE => 'assoc',
			];
			if ( $fld_id ) {
				$block['id'] = (int)$row->ipb_id;
			}
			if ( $fld_user && !$row->ipb_auto ) {
				$block['user'] = $row->ipb_address;
			}
			if ( $fld_userid && !$row->ipb_auto ) {
				$block['userid'] = (int)$row->ipb_user;
			}
			if ( $fld_by ) {
				$block['by'] = $row->ipb_by_text;
			}
			if ( $fld_byid ) {
				$block['byid'] = (int)$row->ipb_by;
			}
			if ( $fld_timestamp ) {
				$block['timestamp'] = wfTimestamp( TS_ISO_8601, $row->ipb_timestamp );
			}
			if ( $fld_expiry ) {
				$block['expiry'] = ApiResult::formatExpiry( $row->ipb_expiry );
			}
			if ( $fld_reason ) {
				$block['reason'] = $commentStore->getComment( 'ipb_reason', $row )->text;
			}
			if ( $fld_range && !$row->ipb_auto ) {
				$block['rangestart'] = IPUtils::formatHex( $row->ipb_range_start );
				$block['rangeend'] = IPUtils::formatHex( $row->ipb_range_end );
			}
			if ( $fld_flags ) {
				// For clarity, these flags use the same names as their action=block counterparts
				$block['automatic'] = (bool)$row->ipb_auto;
				$block['anononly'] = (bool)$row->ipb_anon_only;
				$block['nocreate'] = (bool)$row->ipb_create_account;
				$block['autoblock'] = (bool)$row->ipb_enable_autoblock;
				$block['noemail'] = (bool)$row->ipb_block_email;
				$block['hidden'] = (bool)$row->ipb_deleted;
				$block['allowusertalk'] = (bool)$row->ipb_allow_usertalk;
				$block['partial'] = !(bool)$row->ipb_sitewide;
			}

			if ( $fld_restrictions ) {
				$block['restrictions'] = [];
				if ( !$row->ipb_sitewide && isset( $restrictions[$row->ipb_id] ) ) {
					$block['restrictions'] = $restrictions[$row->ipb_id];
				}
			}

			$fit = $result->addValue( [ 'query', $this->getModuleName() ], null, $block );
			if ( !$fit ) {
				$this->setContinueEnumParameter( 'continue', "$row->ipb_timestamp|$row->ipb_id" );
				break;
			}
		}
		$result->addIndexedTagName( [ 'query', $this->getModuleName() ], 'block' );
	}

	protected function prepareUsername( $user ) {
		if ( !$user ) {
			$encParamName = $this->encodeParamName( 'users' );
			$this->dieWithError( [ 'apierror-baduser', $encParamName, wfEscapeWikiText( $user ) ],
				"baduser_{$encParamName}"
			);
		}
		$name = User::isIP( $user )
			? $user
			: User::getCanonicalName( $user, 'valid' );
		if ( $name === false ) {
			$encParamName = $this->encodeParamName( 'users' );
			$this->dieWithError( [ 'apierror-baduser', $encParamName, wfEscapeWikiText( $user ) ],
				"baduser_{$encParamName}"
			);
		}
		return $name;
	}

	/**
	 * Retrieves the restrictions based on the query result.
	 *
	 * @param IResultWrapper $result
	 * @param int $limit
	 *
	 * @return array
	 */
	private static function getRestrictionData( IResultWrapper $result, $limit ) {
		$partialIds = [];
		$count = 0;
		foreach ( $result as $row ) {
			if ( ++$count <= $limit && !$row->ipb_sitewide ) {
				$partialIds[] = (int)$row->ipb_id;
			}
		}

		$blockRestrictionStore = MediaWikiServices::getInstance()->getBlockRestrictionStore();
		$restrictions = $blockRestrictionStore->loadByBlockId( $partialIds );

		$data = [];
		$keys = [
			'page' => 'pages',
			'ns' => 'namespaces',
		];
		foreach ( $restrictions as $restriction ) {
			$key = $keys[$restriction->getType()];
			$id = $restriction->getBlockId();
			switch ( $restriction->getType() ) {
				case 'page':
					/** @var \MediaWiki\Block\Restriction\PageRestriction $restriction */
					'@phan-var \MediaWiki\Block\Restriction\PageRestriction $restriction';
					$value = [ 'id' => $restriction->getValue() ];
					if ( $restriction->getTitle() ) {
						self::addTitleInfo( $value, $restriction->getTitle() );
					}
					break;
				default:
					$value = $restriction->getValue();
			}

			if ( !isset( $data[$id][$key] ) ) {
				$data[$id][$key] = [];
				ApiResult::setIndexedTagName( $data[$id][$key], $restriction->getType() );
			}
			$data[$id][$key][] = $value;
		}

		return $data;
	}

	public function getAllowedParams() {
		$blockCIDRLimit = $this->getConfig()->get( 'BlockCIDRLimit' );

		return [
			'start' => [
				ApiBase::PARAM_TYPE => 'timestamp'
			],
			'end' => [
				ApiBase::PARAM_TYPE => 'timestamp',
			],
			'dir' => [
				ApiBase::PARAM_TYPE => [
					'newer',
					'older'
				],
				ApiBase::PARAM_DFLT => 'older',
				ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
			],
			'ids' => [
				ApiBase::PARAM_TYPE => 'integer',
				ApiBase::PARAM_ISMULTI => true
			],
			'users' => [
				ApiBase::PARAM_TYPE => 'user',
				UserDef::PARAM_ALLOWED_USER_TYPES => [ 'name', 'ip', 'cidr' ],
				ApiBase::PARAM_ISMULTI => true
			],
			'ip' => [
				ApiBase::PARAM_HELP_MSG => [
					'apihelp-query+blocks-param-ip',
					$blockCIDRLimit['IPv4'],
					$blockCIDRLimit['IPv6'],
				],
			],
			'limit' => [
				ApiBase::PARAM_DFLT => 10,
				ApiBase::PARAM_TYPE => 'limit',
				ApiBase::PARAM_MIN => 1,
				ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
				ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
			],
			'prop' => [
				ApiBase::PARAM_DFLT => 'id|user|by|timestamp|expiry|reason|flags',
				ApiBase::PARAM_TYPE => [
					'id',
					'user',
					'userid',
					'by',
					'byid',
					'timestamp',
					'expiry',
					'reason',
					'range',
					'flags',
					'restrictions',
				],
				ApiBase::PARAM_ISMULTI => true,
				ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
			],
			'show' => [
				ApiBase::PARAM_TYPE => [
					'account',
					'!account',
					'temp',
					'!temp',
					'ip',
					'!ip',
					'range',
					'!range',
				],
				ApiBase::PARAM_ISMULTI => true
			],
			'continue' => [
				ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
			],
		];
	}

	protected function getExamplesMessages() {
		return [
			'action=query&list=blocks'
				=> 'apihelp-query+blocks-example-simple',
			'action=query&list=blocks&bkusers=Alice|Bob'
				=> 'apihelp-query+blocks-example-users',
		];
	}

	public function getHelpUrls() {
		return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Blocks';
	}
}
