ApiQueryAllPages.php

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<?php
use MediaWiki\Cache\GenderCache;
use MediaWiki\MainConfigNames;
use MediaWiki\Permissions\RestrictionStore;
use MediaWiki\Title\NamespaceInfo;
use MediaWiki\Title\Title;
use Wikimedia\ParamValidator\ParamValidator;
use Wikimedia\ParamValidator\TypeDef\IntegerDef;
use Wikimedia\Rdbms\IExpression;
use Wikimedia\Rdbms\LikeValue;
 
class ApiQueryAllPages extends ApiQueryGeneratorBase {
 
    private NamespaceInfo $namespaceInfo;
    private GenderCache $genderCache;
    private RestrictionStore $restrictionStore;
 
    public function __construct(
        ApiQuery $query,
        $moduleName,
        NamespaceInfo $namespaceInfo,
        GenderCache $genderCache,
        RestrictionStore $restrictionStore
    ) {
        parent::__construct( $query, $moduleName, 'ap' );
        $this->namespaceInfo = $namespaceInfo;
        $this->genderCache = $genderCache;
        $this->restrictionStore = $restrictionStore;
    }
 
    public function execute() {
        $this->run();
    }
 
    public function getCacheMode( $params ) {
        return 'public';
    }
 
    public function executeGenerator( $resultPageSet ) {
        if ( $resultPageSet->isResolvingRedirects() ) {
            $this->dieWithError( 'apierror-allpages-generator-redirects', 'params' );
        }
 
        $this->run( $resultPageSet );
    }
 
    private function run( $resultPageSet = null ) {
        $db = $this->getDB();
 
        $params = $this->extractRequestParams();
 
        // Page filters
        $this->addTables( 'page' );
 
        if ( $params['continue'] !== null ) {
            $cont = $this->parseContinueParamOrDie( $params['continue'], [ 'string' ] );
            $op = $params['dir'] == 'descending' ? '<=' : '>=';
            $this->addWhere( $db->expr( 'page_title', $op, $cont[0] ) );
        }
 
        $miserMode = $this->getConfig()->get( MainConfigNames::MiserMode );
        if ( !$miserMode ) {
            if ( $params['filterredir'] == 'redirects' ) {
                $this->addWhereFld( 'page_is_redirect', 1 );
            } elseif ( $params['filterredir'] == 'nonredirects' ) {
                $this->addWhereFld( 'page_is_redirect', 0 );
            }
        }
 
        $this->addWhereFld( 'page_namespace', $params['namespace'] );
        $dir = ( $params['dir'] == 'descending' ? 'older' : 'newer' );
        $from = ( $params['from'] === null
            ? null
            : $this->titlePartToKey( $params['from'], $params['namespace'] ) );
        $to = ( $params['to'] === null
            ? null
            : $this->titlePartToKey( $params['to'], $params['namespace'] ) );
        $this->addWhereRange( 'page_title', $dir, $from, $to );
 
        if ( isset( $params['prefix'] ) ) {
            $this->addWhere(
                $db->expr(
                    'page_title',
                    IExpression::LIKE,
                    new LikeValue( $this->titlePartToKey( $params['prefix'], $params['namespace'] ), $db->anyString() )
                )
            );
        }
 
        if ( $resultPageSet === null ) {
            $selectFields = [
                'page_namespace',
                'page_title',
                'page_id'
            ];
        } else {
            $selectFields = $resultPageSet->getPageTableFields();
        }
 
        $miserModeFilterRedirValue = null;
        $miserModeFilterRedir = $miserMode && $params['filterredir'] !== 'all';
        if ( $miserModeFilterRedir ) {
            $selectFields[] = 'page_is_redirect';
 
            if ( $params['filterredir'] == 'redirects' ) {
                $miserModeFilterRedirValue = 1;
            } elseif ( $params['filterredir'] == 'nonredirects' ) {
                $miserModeFilterRedirValue = 0;
            }
        }
 
        $this->addFields( $selectFields );
        $forceNameTitleIndex = true;
        if ( isset( $params['minsize'] ) ) {
            $this->addWhere( 'page_len>=' . (int)$params['minsize'] );
            $forceNameTitleIndex = false;
        }
 
        if ( isset( $params['maxsize'] ) ) {
            $this->addWhere( 'page_len<=' . (int)$params['maxsize'] );
            $forceNameTitleIndex = false;
        }
 
        // Page protection filtering
        if ( $params['prtype'] || $params['prexpiry'] != 'all' ) {
            $this->addTables( 'page_restrictions' );
            $this->addWhere( 'page_id=pr_page' );
            $this->addWhere(
                $db->expr( 'pr_expiry', '>', $db->timestamp() )->or( 'pr_expiry', '=', null )
            );
 
            if ( $params['prtype'] ) {
                $this->addWhereFld( 'pr_type', $params['prtype'] );
 
                if ( isset( $params['prlevel'] ) ) {
                    // Remove the empty string and '*' from the prlevel array
                    $prlevel = array_diff( $params['prlevel'], [ '', '*' ] );
 
                    if ( count( $prlevel ) ) {
                        $this->addWhereFld( 'pr_level', $prlevel );
                    }
                }
                if ( $params['prfiltercascade'] == 'cascading' ) {
                    $this->addWhereFld( 'pr_cascade', 1 );
                } elseif ( $params['prfiltercascade'] == 'noncascading' ) {
                    $this->addWhereFld( 'pr_cascade', 0 );
                }
            }
            $forceNameTitleIndex = false;
 
            if ( $params['prexpiry'] == 'indefinite' ) {
                $this->addWhereFld( 'pr_expiry', [ $db->getInfinity(), null ] );
            } elseif ( $params['prexpiry'] == 'definite' ) {
                $this->addWhere( $db->expr( 'pr_expiry', '!=', $db->getInfinity() ) );
            }
 
            $this->addOption( 'DISTINCT' );
        } elseif ( isset( $params['prlevel'] ) ) {
            $this->dieWithError(
                [ 'apierror-invalidparammix-mustusewith', 'prlevel', 'prtype' ], 'invalidparammix'
            );
        }
 
        if ( $params['filterlanglinks'] == 'withoutlanglinks' ) {
            $this->addTables( 'langlinks' );
            $this->addJoinConds( [ 'langlinks' => [ 'LEFT JOIN', 'page_id=ll_from' ] ] );
            $this->addWhere( [ 'll_from' => null ] );
            $forceNameTitleIndex = false;
        } elseif ( $params['filterlanglinks'] == 'withlanglinks' ) {
            $this->addTables( 'langlinks' );
            $this->addWhere( 'page_id=ll_from' );
            $this->addOption( 'STRAIGHT_JOIN' );
 
            // MySQL filesorts if we use a GROUP BY that works with the rules
            // in the 1992 SQL standard (it doesn't like having the
            // constant-in-WHERE page_namespace column in there). Using the
            // 1999 rules works fine, but that breaks other DBs. Sigh.
            // @todo Once we drop support for 1992-rule DBs, we can simplify this.
            $dbType = $db->getType();
            if ( $dbType === 'mysql' || $dbType === 'sqlite' ) {
                // Ignore the rules, or 1999 rules if you count unique keys
                // over non-NULL columns as satisfying the requirement for
                // "functional dependency" and don't require including
                // constant-in-WHERE columns in the GROUP BY.
                $this->addOption( 'GROUP BY', [ 'page_title' ] );
            } elseif ( $dbType === 'postgres' && $db->getServerVersion() >= 9.1 ) {
                // 1999 rules only counting primary keys
                $this->addOption( 'GROUP BY', [ 'page_title', 'page_id' ] );
            } else {
                // 1992 rules
                $this->addOption( 'GROUP BY', $selectFields );
            }
 
            $forceNameTitleIndex = false;
        }
 
        if ( $forceNameTitleIndex ) {
            $this->addOption( 'USE INDEX', 'page_name_title' );
        }
 
        $limit = $params['limit'];
        $this->addOption( 'LIMIT', $limit + 1 );
        $res = $this->select( __METHOD__ );
 
        // Get gender information
        if ( $this->namespaceInfo->hasGenderDistinction( $params['namespace'] ) ) {
            $users = [];
            foreach ( $res as $row ) {
                $users[] = $row->page_title;
            }
            $this->genderCache->doQuery( $users, __METHOD__ );
            $res->rewind(); // reset
        }
 
        $count = 0;
        $result = $this->getResult();
        foreach ( $res as $row ) {
            if ( ++$count > $limit ) {
                // We've reached the one extra which shows that there are
                // additional pages to be had. Stop here...
                $this->setContinueEnumParameter( 'continue', $row->page_title );
                break;
            }
 
            if ( $miserModeFilterRedir && (int)$row->page_is_redirect !== $miserModeFilterRedirValue ) {
                // Filter implemented in PHP due to being in Miser Mode
                continue;
            }
 
            if ( $resultPageSet === null ) {
                $title = Title::makeTitle( $row->page_namespace, $row->page_title );
                $vals = [
                    'pageid' => (int)$row->page_id,
                    'ns' => $title->getNamespace(),
                    'title' => $title->getPrefixedText()
                ];
                $fit = $result->addValue( [ 'query', $this->getModuleName() ], null, $vals );
                if ( !$fit ) {
                    $this->setContinueEnumParameter( 'continue', $row->page_title );
                    break;
                }
            } else {
                $resultPageSet->processDbRow( $row );
            }
        }
 
        if ( $resultPageSet === null ) {
            $result->addIndexedTagName( [ 'query', $this->getModuleName() ], 'p' );
        }
    }
 
    public function getAllowedParams() {
        $ret = [
            'from' => null,
            'continue' => [
                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
            ],
            'to' => null,
            'prefix' => null,
            'namespace' => [
                ParamValidator::PARAM_DEFAULT => NS_MAIN,
                ParamValidator::PARAM_TYPE => 'namespace',
            ],
            'filterredir' => [
                ParamValidator::PARAM_DEFAULT => 'all',
                ParamValidator::PARAM_TYPE => [
                    'all',
                    'redirects',
                    'nonredirects'
                ]
            ],
            'filterlanglinks' => [
                ParamValidator::PARAM_TYPE => [
                    'withlanglinks',
                    'withoutlanglinks',
                    'all'
                ],
                ParamValidator::PARAM_DEFAULT => 'all'
            ],
            'minsize' => [
                ParamValidator::PARAM_TYPE => 'integer',
            ],
            'maxsize' => [
                ParamValidator::PARAM_TYPE => 'integer',
            ],
            'prtype' => [
                ParamValidator::PARAM_TYPE => $this->restrictionStore->listAllRestrictionTypes( true ),
                ParamValidator::PARAM_ISMULTI => true
            ],
            'prlevel' => [
                ParamValidator::PARAM_TYPE =>
                    $this->getConfig()->get( MainConfigNames::RestrictionLevels ),
                ParamValidator::PARAM_ISMULTI => true
            ],
            'prfiltercascade' => [
                ParamValidator::PARAM_DEFAULT => 'all',
                ParamValidator::PARAM_TYPE => [
                    'cascading',
                    'noncascading',
                    'all'
                ],
            ],
            'prexpiry' => [
                ParamValidator::PARAM_TYPE => [
                    'indefinite',
                    'definite',
                    'all'
                ],
                ParamValidator::PARAM_DEFAULT => 'all',
                ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
            ],
            'limit' => [
                ParamValidator::PARAM_DEFAULT => 10,
                ParamValidator::PARAM_TYPE => 'limit',
                IntegerDef::PARAM_MIN => 1,
                IntegerDef::PARAM_MAX => ApiBase::LIMIT_BIG1,
                IntegerDef::PARAM_MAX2 => ApiBase::LIMIT_BIG2
            ],
            'dir' => [
                ParamValidator::PARAM_DEFAULT => 'ascending',
                ParamValidator::PARAM_TYPE => [
                    'ascending',
                    'descending'
                ]
            ],
        ];
 
        if ( $this->getConfig()->get( MainConfigNames::MiserMode ) ) {
            $ret['filterredir'][ApiBase::PARAM_HELP_MSG_APPEND] = [ 'api-help-param-limited-in-miser-mode' ];
        }
 
        return $ret;
    }
 
    protected function getExamplesMessages() {
        return [
            'action=query&list=allpages&apfrom=B'
                => 'apihelp-query+allpages-example-b',
            'action=query&generator=allpages&gaplimit=4&gapfrom=T&prop=info'
                => 'apihelp-query+allpages-example-generator',
            'action=query&generator=allpages&gaplimit=2&' .
                'gapfilterredir=nonredirects&gapfrom=Re&prop=revisions&rvprop=content'
                => 'apihelp-query+allpages-example-generator-revisions',
        ];
    }
 
    public function getHelpUrls() {
        return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Allpages';
    }
}