ApiQueryAllPages.php

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<?php
class ApiQueryAllPages extends ApiQueryGeneratorBase {

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

    public function execute() {
        $this->run();
    }

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

    public function executeGenerator( $resultPageSet ) {
        if ( $resultPageSet->isResolvingRedirects() ) {
            $this->dieUsage( 'Use "gapfilterredir=nonredirects" option instead of "redirects" when using allpages as a generator', 'params' );
        }

        $this->run( $resultPageSet );
    }

    private function run( $resultPageSet = null ) {
        $db = $this->getDB();

        $params = $this->extractRequestParams();

        // Page filters
        $this->addTables( 'page' );

        if ( !is_null( $params['continue'] ) ) {
            $cont = explode( '|', $params['continue'] );
            $this->dieContinueUsageIf( count( $cont ) != 1 );
            $op = $params['dir'] == 'descending' ? '<' : '>';
            $cont_from = $db->addQuotes( $cont[0] );
            $this->addWhere( "page_title $op= $cont_from" );
        }

        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 = ( is_null( $params['from'] ) ? null : $this->titlePartToKey( $params['from'] ) );
        $to = ( is_null( $params['to'] ) ? null : $this->titlePartToKey( $params['to'] ) );
        $this->addWhereRange( 'page_title', $dir, $from, $to );

        if ( isset( $params['prefix'] ) ) {
            $this->addWhere( 'page_title' . $db->buildLike( $this->titlePartToKey( $params['prefix'] ), $db->anyString() ) );
        }

        if ( is_null( $resultPageSet ) ) {
            $selectFields = array(
                'page_namespace',
                'page_title',
                'page_id'
            );
        } else {
            $selectFields = $resultPageSet->getPageTableFields();
        }

        $this->addFields( $selectFields );
        $forceNameTitleIndex = true;
        if ( isset( $params['minsize'] ) ) {
            $this->addWhere( 'page_len>=' . intval( $params['minsize'] ) );
            $forceNameTitleIndex = false;
        }

        if ( isset( $params['maxsize'] ) ) {
            $this->addWhere( 'page_len<=' . intval( $params['maxsize'] ) );
            $forceNameTitleIndex = false;
        }

        // Page protection filtering
        if ( count( $params['prtype'] ) || $params['prexpiry'] != 'all' ) {
            $this->addTables( 'page_restrictions' );
            $this->addWhere( 'page_id=pr_page' );
            $this->addWhere( "pr_expiry > {$db->addQuotes( $db->timestamp() )} OR pr_expiry IS NULL" );

            if ( count( $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'], array( '', '*' ) );

                    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' ) {
                $this->addWhere( "pr_expiry = {$db->addQuotes( $db->getInfinity() )} OR pr_expiry IS NULL" );
            } elseif ( $params['prexpiry'] == 'definite' ) {
                $this->addWhere( "pr_expiry != {$db->addQuotes( $db->getInfinity() )}" );
            }

            $this->addOption( 'DISTINCT' );

        } elseif ( isset( $params['prlevel'] ) ) {
            $this->dieUsage( 'prlevel may not be used without prtype', 'params' );
        }

        if ( $params['filterlanglinks'] == 'withoutlanglinks' ) {
            $this->addTables( 'langlinks' );
            $this->addJoinConds( array( 'langlinks' => array( 'LEFT JOIN', 'page_id=ll_from' ) ) );
            $this->addWhere( 'll_from IS NULL' );
            $forceNameTitleIndex = false;
        } elseif ( $params['filterlanglinks'] == 'withlanglinks' ) {
            $this->addTables( 'langlinks' );
            $this->addWhere( 'page_id=ll_from' );
            $this->addOption( 'STRAIGHT_JOIN' );
            // We have to GROUP BY all selected fields to stop
            // PostgreSQL from whining
            $this->addOption( 'GROUP BY', $selectFields );
            $forceNameTitleIndex = false;
        }

        if ( $forceNameTitleIndex ) {
            $this->addOption( 'USE INDEX', 'name_title' );
        }

        $limit = $params['limit'];
        $this->addOption( 'LIMIT', $limit + 1 );
        $res = $this->select( __METHOD__ );

        //Get gender information
        if ( MWNamespace::hasGenderDistinction( $params['namespace'] ) ) {
            $users = array();
            foreach ( $res as $row ) {
                $users[] = $row->page_title;
            }
            GenderCache::singleton()->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 ( is_null( $resultPageSet ) ) {
                $title = Title::makeTitle( $row->page_namespace, $row->page_title );
                $vals = array(
                    'pageid' => intval( $row->page_id ),
                    'ns' => intval( $title->getNamespace() ),
                    'title' => $title->getPrefixedText()
                );
                $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $vals );
                if ( !$fit ) {
                    $this->setContinueEnumParameter( 'continue', $row->page_title );
                    break;
                }
            } else {
                $resultPageSet->processDbRow( $row );
            }
        }

        if ( is_null( $resultPageSet ) ) {
            $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'p' );
        }
    }

    public function getAllowedParams() {
        global $wgRestrictionLevels;

        return array(
            'from' => null,
            'continue' => null,
            'to' => null,
            'prefix' => null,
            'namespace' => array(
                ApiBase::PARAM_DFLT => NS_MAIN,
                ApiBase::PARAM_TYPE => 'namespace',
            ),
            'filterredir' => array(
                ApiBase::PARAM_DFLT => 'all',
                ApiBase::PARAM_TYPE => array(
                    'all',
                    'redirects',
                    'nonredirects'
                )
            ),
            'minsize' => array(
                ApiBase::PARAM_TYPE => 'integer',
            ),
            'maxsize' => array(
                ApiBase::PARAM_TYPE => 'integer',
            ),
            'prtype' => array(
                ApiBase::PARAM_TYPE => Title::getFilteredRestrictionTypes( true ),
                ApiBase::PARAM_ISMULTI => true
            ),
            'prlevel' => array(
                ApiBase::PARAM_TYPE => $wgRestrictionLevels,
                ApiBase::PARAM_ISMULTI => true
            ),
            'prfiltercascade' => array(
                ApiBase::PARAM_DFLT => 'all',
                ApiBase::PARAM_TYPE => array(
                    'cascading',
                    'noncascading',
                    'all'
                ),
            ),
            'limit' => array(
                ApiBase::PARAM_DFLT => 10,
                ApiBase::PARAM_TYPE => 'limit',
                ApiBase::PARAM_MIN => 1,
                ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
                ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
            ),
            'dir' => array(
                ApiBase::PARAM_DFLT => 'ascending',
                ApiBase::PARAM_TYPE => array(
                    'ascending',
                    'descending'
                )
            ),
            'filterlanglinks' => array(
                ApiBase::PARAM_TYPE => array(
                    'withlanglinks',
                    'withoutlanglinks',
                    'all'
                ),
                ApiBase::PARAM_DFLT => 'all'
            ),
            'prexpiry' => array(
                ApiBase::PARAM_TYPE => array(
                    'indefinite',
                    'definite',
                    'all'
                ),
                ApiBase::PARAM_DFLT => 'all'
            ),
        );
    }

    public function getParamDescription() {
        $p = $this->getModulePrefix();
        return array(
            'from' => 'The page title to start enumerating from',
            'continue' => 'When more results are available, use this to continue',
            'to' => 'The page title to stop enumerating at',
            'prefix' => 'Search for all page titles that begin with this value',
            'namespace' => 'The namespace to enumerate',
            'filterredir' => 'Which pages to list',
            'dir' => 'The direction in which to list',
            'minsize' => 'Limit to pages with at least this many bytes',
            'maxsize' => 'Limit to pages with at most this many bytes',
            'prtype' => 'Limit to protected pages only',
            'prlevel' => "The protection level (must be used with {$p}prtype= parameter)",
            'prfiltercascade' => "Filter protections based on cascadingness (ignored when {$p}prtype isn't set)",
            'filterlanglinks' => array(
                'Filter based on whether a page has langlinks',
                'Note that this may not consider langlinks added by extensions.',
            ),
            'limit' => 'How many total pages to return.',
            'prexpiry' => array(
                'Which protection expiry to filter the page on',
                ' indefinite - Get only pages with indefinite protection expiry',
                ' definite - Get only pages with a definite (specific) protection expiry',
                ' all - Get pages with any protections expiry'
            ),
        );
    }

    public function getResultProperties() {
        return array(
            '' => array(
                'pageid' => 'integer',
                'ns' => 'namespace',
                'title' => 'string'
            )
        );
    }

    public function getDescription() {
        return 'Enumerate all pages sequentially in a given namespace';
    }

    public function getPossibleErrors() {
        return array_merge( parent::getPossibleErrors(), array(
            array( 'code' => 'params', 'info' => 'Use "gapfilterredir=nonredirects" option instead of "redirects" when using allpages as a generator' ),
            array( 'code' => 'params', 'info' => 'prlevel may not be used without prtype' ),
        ) );
    }

    public function getExamples() {
        return array(
            'api.php?action=query&list=allpages&apfrom=B' => array(
                'Simple Use',
                'Show a list of pages starting at the letter "B"',
            ),
            'api.php?action=query&generator=allpages&gaplimit=4&gapfrom=T&prop=info' => array(
                'Using as Generator',
                'Show info about 4 pages starting at the letter "T"',
            ),
            'api.php?action=query&generator=allpages&gaplimit=2&gapfilterredir=nonredirects&gapfrom=Re&prop=revisions&rvprop=content' => array(
                'Show content of first 2 non-redirect pages beginning at "Re"',
            )
        );
    }

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