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<?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
*
* @file
*/
namespace MediaWiki\Linker;
use InvalidArgumentException;
use MediaWiki\Config\Config;
use MediaWiki\MainConfigNames;
/**
* Service for compat reading of links tables
*
* @since 1.39
*/
class LinksMigration {
/** @var Config */
private $config;
/** @var LinkTargetLookup */
private $linkTargetLookup;
/** @var array[] */
public static $mapping = [
'templatelinks' => [
'config' => -1,
'page_id' => 'tl_from',
// Used by the updater only
'ns' => 'tl_namespace',
// Used by the updater only
'title' => 'tl_title',
'target_id' => 'tl_target_id',
'deprecated_configs' => [],
],
'pagelinks' => [
'config' => MainConfigNames::PageLinksSchemaMigrationStage,
'page_id' => 'pl_from',
'ns' => 'pl_namespace',
'title' => 'pl_title',
'target_id' => 'pl_target_id',
'deprecated_configs' => [
SCHEMA_COMPAT_WRITE_OLD,
SCHEMA_COMPAT_READ_OLD
],
],
'categorylinks' => [
'config' => MainConfigNames::CategoryLinksSchemaMigrationStage,
'page_id' => 'cl_from',
'ns' => 14,
'title' => 'cl_to',
'target_id' => 'cl_target_id',
'deprecated_configs' => [],
],
];
/** @var string[] */
public static $prefixToTableMapping = [
'tl' => 'templatelinks',
'pl' => 'pagelinks',
'cl' => 'categorylinks',
];
public function __construct( Config $config, LinkTargetLookup $linktargetLookup ) {
$this->config = $config;
$this->linkTargetLookup = $linktargetLookup;
}
/**
* Return the conditions to be used in querying backlinks to a page
*
* @param string $table
* @param LinkTarget $linkTarget
* @return array
*/
public function getLinksConditions( string $table, LinkTarget $linkTarget ): array {
$this->assertMapping( $table );
if ( $this->isMigrationReadNew( $table ) ) {
$targetId = $this->linkTargetLookup->getLinkTargetId( $linkTarget );
// Not found, it shouldn't pick anything
if ( !$targetId ) {
return [ '1=0' ];
}
return [
self::$mapping[$table]['target_id'] => $targetId,
];
} else {
return [
self::$mapping[$table]['ns'] => $linkTarget->getNamespace(),
self::$mapping[$table]['title'] => $linkTarget->getDBkey(),
];
}
}
/**
* Return the query to be used when you want to or from a group of pages
*
* @param string $table
* @param string $joinTable table to end the join chain. Most of the time it's linktarget
* @param string $joinType
* @return array
*/
public function getQueryInfo( string $table, string $joinTable = 'linktarget', string $joinType = 'JOIN' ) {
$this->assertMapping( $table );
if ( $this->isMigrationReadNew( $table ) ) {
$targetId = self::$mapping[$table]['target_id'];
if ( $joinTable === 'linktarget' ) {
$tables = [ $table, 'linktarget' ];
} else {
$tables = [ 'linktarget', $table ];
}
return [
'tables' => $tables,
'fields' => [
$targetId,
'lt_namespace',
'lt_title'
],
'joins' => [ $joinTable => [
$joinType,
[ "$targetId=lt_id" ]
] ],
];
} else {
return [
'fields' => [
self::$mapping[$table]['ns'],
self::$mapping[$table]['title']
],
'tables' => [ $table ],
'joins' => [],
];
}
}
public function getTitleFields( $table ) {
$this->assertMapping( $table );
if ( $this->isMigrationReadNew( $table ) ) {
return [ 'lt_namespace', 'lt_title' ];
} else {
return [ self::$mapping[$table]['ns'], self::$mapping[$table]['title'] ];
}
}
private function isMigrationReadNew( string $table ): bool {
return self::$mapping[$table]['config'] === -1 ||
$this->config->get( self::$mapping[$table]['config'] ) & SCHEMA_COMPAT_READ_NEW;
}
private function assertMapping( string $table ) {
if ( !isset( self::$mapping[$table] ) ) {
throw new InvalidArgumentException(
"LinksMigration doesn't support the $table table yet"
);
}
if ( self::$mapping[$table]['config'] !== -1 && self::$mapping[$table]['deprecated_configs'] ) {
$config = $this->config->get( self::$mapping[$table]['config'] );
foreach ( self::$mapping[$table]['deprecated_configs'] as $deprecatedConfig ) {
if ( $config & $deprecatedConfig ) {
throw new InvalidArgumentException(
"LinksMigration config $config on $table table is not supported anymore"
);
}
}
}
}
}