ApiQueryAllLinks.php

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<?php
class ApiQueryAllLinks extends ApiQueryGeneratorBase {

    public function __construct( $query, $moduleName ) {
        switch ( $moduleName ) {
            case 'alllinks':
                $prefix = 'al';
                $this->table = 'pagelinks';
                $this->tablePrefix = 'pl_';
                $this->fieldTitle = 'title';
                $this->dfltNamespace = NS_MAIN;
                $this->hasNamespace = true;
                $this->indexTag = 'l';
                $this->description = 'Enumerate all links that point to a given namespace';
                $this->descriptionWhat = 'link';
                $this->descriptionTargets = 'linked titles';
                $this->descriptionLinking = 'linking';
                break;
            case 'alltransclusions':
                $prefix = 'at';
                $this->table = 'templatelinks';
                $this->tablePrefix = 'tl_';
                $this->fieldTitle = 'title';
                $this->dfltNamespace = NS_TEMPLATE;
                $this->hasNamespace = true;
                $this->indexTag = 't';
                $this->description = 'List all transclusions (pages embedded using {{x}}), including non-existing';
                $this->descriptionWhat = 'transclusion';
                $this->descriptionTargets = 'transcluded titles';
                $this->descriptionLinking = 'transcluding';
                break;
            case 'allfileusages':
                $prefix = 'af';
                $this->table = 'imagelinks';
                $this->tablePrefix = 'il_';
                $this->fieldTitle = 'to';
                $this->dfltNamespace = NS_FILE;
                $this->hasNamespace = false;
                $this->indexTag = 'f';
                $this->description = 'List all file usages, including non-existing';
                $this->descriptionWhat = 'file';
                $this->descriptionTargets = 'file titles';
                $this->descriptionLinking = 'using';
                break;
            default:
                ApiBase::dieDebug( __METHOD__, 'Unknown module name' );
        }

        parent::__construct( $query, $moduleName, $prefix );
    }

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

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

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

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

        $pfx = $this->tablePrefix;
        $fieldTitle = $this->fieldTitle;
        $prop = array_flip( $params['prop'] );
        $fld_ids = isset( $prop['ids'] );
        $fld_title = isset( $prop['title'] );
        if ( $this->hasNamespace ) {
            $namespace = $params['namespace'];
        } else {
            $namespace = $this->dfltNamespace;
        }

        if ( $params['unique'] ) {
            if ( $fld_ids ) {
                $this->dieUsage(
                    "{$this->getModuleName()} cannot return corresponding page ids in unique {$this->descriptionWhat}s mode",
                    'params' );
            }
            $this->addOption( 'DISTINCT' );
        }

        $this->addTables( $this->table );
        if ( $this->hasNamespace ) {
            $this->addWhereFld( $pfx . 'namespace', $namespace );
        }

        $continue = !is_null( $params['continue'] );
        if ( $continue ) {
            $continueArr = explode( '|', $params['continue'] );
            $op = $params['dir'] == 'descending' ? '<' : '>';
            if ( $params['unique'] ) {
                $this->dieContinueUsageIf( count( $continueArr ) != 1 );
                $continueTitle = $db->addQuotes( $continueArr[0] );
                $this->addWhere( "{$pfx}{$fieldTitle} $op= $continueTitle" );
            } else {
                $this->dieContinueUsageIf( count( $continueArr ) != 2 );
                $continueTitle = $db->addQuotes( $continueArr[0] );
                $continueFrom = intval( $continueArr[1] );
                $this->addWhere(
                    "{$pfx}{$fieldTitle} $op $continueTitle OR " .
                    "({$pfx}{$fieldTitle} = $continueTitle AND " .
                    "{$pfx}from $op= $continueFrom)"
                );
            }
        }

        // 'continue' always overrides 'from'
        $from = ( $continue || is_null( $params['from'] ) ? null : $this->titlePartToKey( $params['from'] ) );
        $to = ( is_null( $params['to'] ) ? null : $this->titlePartToKey( $params['to'] ) );
        $this->addWhereRange( $pfx . $fieldTitle, 'newer', $from, $to );

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

        $this->addFields( array( 'pl_title' => $pfx . $fieldTitle ) );
        $this->addFieldsIf( array( 'pl_from' => $pfx . 'from' ), !$params['unique'] );

        if ( $this->hasNamespace ) {
            $this->addOption( 'USE INDEX', $pfx . 'namespace' );
        }
        $limit = $params['limit'];
        $this->addOption( 'LIMIT', $limit + 1 );

        $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
        $orderBy = array();
        $orderBy[] = $pfx . $fieldTitle . $sort;
        if ( !$params['unique'] ) {
            $orderBy[] = $pfx . 'from' . $sort;
        }
        $this->addOption( 'ORDER BY', $orderBy );

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

        $pageids = array();
        $titles = array();
        $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...
                if ( $params['unique'] ) {
                    $this->setContinueEnumParameter( 'continue', $row->pl_title );
                } else {
                    $this->setContinueEnumParameter( 'continue', $row->pl_title . '|' . $row->pl_from );
                }
                break;
            }

            if ( is_null( $resultPageSet ) ) {
                $vals = array();
                if ( $fld_ids ) {
                    $vals['fromid'] = intval( $row->pl_from );
                }
                if ( $fld_title ) {
                    $title = Title::makeTitle( $namespace, $row->pl_title );
                    ApiQueryBase::addTitleInfo( $vals, $title );
                }
                $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $vals );
                if ( !$fit ) {
                    if ( $params['unique'] ) {
                        $this->setContinueEnumParameter( 'continue', $row->pl_title );
                    } else {
                        $this->setContinueEnumParameter( 'continue', $row->pl_title . '|' . $row->pl_from );
                    }
                    break;
                }
            } elseif ( $params['unique'] ) {
                $titles[] = Title::makeTitle( $namespace, $row->pl_title );
            } else {
                $pageids[] = $row->pl_from;
            }
        }

        if ( is_null( $resultPageSet ) ) {
            $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), $this->indexTag );
        } elseif ( $params['unique'] ) {
            $resultPageSet->populateFromTitles( $titles );
        } else {
            $resultPageSet->populateFromPageIDs( $pageids );
        }
    }

    public function getAllowedParams() {
        $allowedParams = array(
            'continue' => null,
            'from' => null,
            'to' => null,
            'prefix' => null,
            'unique' => false,
            'prop' => array(
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_DFLT => 'title',
                ApiBase::PARAM_TYPE => array(
                    'ids',
                    'title'
                )
            ),
            'namespace' => array(
                ApiBase::PARAM_DFLT => $this->dfltNamespace,
                ApiBase::PARAM_TYPE => 'namespace'
            ),
            'limit' => array(
                ApiBase::PARAM_DFLT => 10,
                ApiBase::PARAM_TYPE => 'limit',
                ApiBase::PARAM_MIN => 1,
                ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
                ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
            ),
            'dir' => array(
                ApiBase::PARAM_DFLT => 'ascending',
                ApiBase::PARAM_TYPE => array(
                    'ascending',
                    'descending'
                )
            ),
        );
        if ( !$this->hasNamespace ) {
            unset( $allowedParams['namespace'] );
        }
        return $allowedParams;
    }

    public function getParamDescription() {
        $p = $this->getModulePrefix();
        $what = $this->descriptionWhat;
        $targets = $this->descriptionTargets;
        $linking = $this->descriptionLinking;
        $paramDescription = array(
            'from' => "The title of the $what to start enumerating from",
            'to' => "The title of the $what to stop enumerating at",
            'prefix' => "Search for all $targets that begin with this value",
            'unique' => array(
                "Only show distinct $targets. Cannot be used with {$p}prop=ids.",
                'When used as a generator, yields target pages instead of source pages.',
            ),
            'prop' => array(
                'What pieces of information to include',
                " ids    - Adds the pageid of the $linking page (Cannot be used with {$p}unique)",
                " title  - Adds the title of the $what",
            ),
            'namespace' => 'The namespace to enumerate',
            'limit' => 'How many total items to return',
            'continue' => 'When more results are available, use this to continue',
            'dir' => 'The direction in which to list',
        );
        if ( !$this->hasNamespace ) {
            unset( $paramDescription['namespace'] );
        }
        return $paramDescription;
    }

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

    public function getDescription() {
        return $this->description;
    }

    public function getPossibleErrors() {
        $m = $this->getModuleName();
        $what = $this->descriptionWhat;
        return array_merge( parent::getPossibleErrors(), array(
            array( 'code' => 'params', 'info' => "{$m} cannot return corresponding page ids in unique {$what}s mode" ),
        ) );
    }

    public function getExamples() {
        $p = $this->getModulePrefix();
        $name = $this->getModuleName();
        $what = $this->descriptionWhat;
        $targets = $this->descriptionTargets;
        return array(
            "api.php?action=query&list={$name}&{$p}from=B&{$p}prop=ids|title"
                    => "List $targets with page ids they are from, including missing ones. Start at B",
            "api.php?action=query&list={$name}&{$p}unique=&{$p}from=B"
                    => "List unique $targets",
            "api.php?action=query&generator={$name}&g{$p}unique=&g{$p}from=B"
                    => "Gets all $targets, marking the missing ones",
            "api.php?action=query&generator={$name}&g{$p}from=B"
                    => "Gets pages containing the {$what}s",
        );
    }

    public function getHelpUrls() {
        $name = ucfirst( $this->getModuleName() );
        return "https://www.mediawiki.org/wiki/API:{$name}";
    }
}