ApiQueryAllLinks.php

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<?php
class ApiQueryAllLinks extends ApiQueryGeneratorBase {

    private $table, $tablePrefix, $indexTag;
    private $fieldTitle = 'title';
    private $dfltNamespace = NS_MAIN;
    private $hasNamespace = true;
    private $useIndex = null;
    private $props = [];

    public function __construct( ApiQuery $query, $moduleName ) {
        switch ( $moduleName ) {
            case 'alllinks':
                $prefix = 'al';
                $this->table = 'pagelinks';
                $this->tablePrefix = 'pl_';
                $this->useIndex = 'pl_namespace';
                $this->indexTag = 'l';
                break;
            case 'alltransclusions':
                $prefix = 'at';
                $this->table = 'templatelinks';
                $this->tablePrefix = 'tl_';
                $this->dfltNamespace = NS_TEMPLATE;
                $this->useIndex = 'tl_namespace';
                $this->indexTag = 't';
                break;
            case 'allfileusages':
                $prefix = 'af';
                $this->table = 'imagelinks';
                $this->tablePrefix = 'il_';
                $this->fieldTitle = 'to';
                $this->dfltNamespace = NS_FILE;
                $this->hasNamespace = false;
                $this->indexTag = 'f';
                break;
            case 'allredirects':
                $prefix = 'ar';
                $this->table = 'redirect';
                $this->tablePrefix = 'rd_';
                $this->indexTag = 'r';
                $this->props = [
                    'fragment' => 'rd_fragment',
                    'interwiki' => 'rd_interwiki',
                ];
                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'] ) {
            $matches = array_intersect_key( $prop, $this->props + [ 'ids' => 1 ] );
            if ( $matches ) {
                $p = $this->getModulePrefix();
                $this->dieWithError(
                    [
                        'apierror-invalidparammix-cannotusewith',
                        "{$p}prop=" . implode( '|', array_keys( $matches ) ),
                        "{$p}unique"
                    ],
                    'invalidparammix'
                );
            }
            $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] );
                $continueFrom = (int)$continueArr[1];
                $this->addWhere(
                    "{$pfx}{$fieldTitle} $op $continueTitle OR " .
                    "({$pfx}{$fieldTitle} = $continueTitle AND " .
                    "{$pfx}from $op= $continueFrom)"
                );
            }
        }

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

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

        $this->addFields( [ 'pl_title' => $pfx . $fieldTitle ] );
        $this->addFieldsIf( [ 'pl_from' => $pfx . 'from' ], !$params['unique'] );
        foreach ( $this->props as $name => $field ) {
            $this->addFieldsIf( $field, isset( $prop[$name] ) );
        }

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

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

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

        $pageids = [];
        $titles = [];
        $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 = [
                    ApiResult::META_TYPE => 'assoc',
                ];
                if ( $fld_ids ) {
                    $vals['fromid'] = (int)$row->pl_from;
                }
                if ( $fld_title ) {
                    $title = Title::makeTitle( $namespace, $row->pl_title );
                    ApiQueryBase::addTitleInfo( $vals, $title );
                }
                foreach ( $this->props as $name => $field ) {
                    if ( isset( $prop[$name] ) && $row->$field !== null && $row->$field !== '' ) {
                        $vals[$name] = $row->$field;
                    }
                }
                $fit = $result->addValue( [ '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->addIndexedTagName( [ 'query', $this->getModuleName() ], $this->indexTag );
        } elseif ( $params['unique'] ) {
            $resultPageSet->populateFromTitles( $titles );
        } else {
            $resultPageSet->populateFromPageIDs( $pageids );
        }
    }

    public function getAllowedParams() {
        $allowedParams = [
            'continue' => [
                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
            ],
            'from' => null,
            'to' => null,
            'prefix' => null,
            'unique' => false,
            'prop' => [
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_DFLT => 'title',
                ApiBase::PARAM_TYPE => array_merge(
                    [ 'ids', 'title' ], array_keys( $this->props )
                ),
                ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
            ],
            'namespace' => [
                ApiBase::PARAM_DFLT => $this->dfltNamespace,
                ApiBase::PARAM_TYPE => 'namespace',
                ApiBase::PARAM_EXTRA_NAMESPACES => [ NS_MEDIA, NS_SPECIAL ],
            ],
            'limit' => [
                ApiBase::PARAM_DFLT => 10,
                ApiBase::PARAM_TYPE => 'limit',
                ApiBase::PARAM_MIN => 1,
                ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
                ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
            ],
            'dir' => [
                ApiBase::PARAM_DFLT => 'ascending',
                ApiBase::PARAM_TYPE => [
                    'ascending',
                    'descending'
                ]
            ],
        ];
        if ( !$this->hasNamespace ) {
            unset( $allowedParams['namespace'] );
        }

        return $allowedParams;
    }

    protected function getExamplesMessages() {
        $p = $this->getModulePrefix();
        $name = $this->getModuleName();
        $path = $this->getModulePath();

        return [
            "action=query&list={$name}&{$p}from=B&{$p}prop=ids|title"
                => "apihelp-$path-example-B",
            "action=query&list={$name}&{$p}unique=&{$p}from=B"
                => "apihelp-$path-example-unique",
            "action=query&generator={$name}&g{$p}unique=&g{$p}from=B"
                => "apihelp-$path-example-unique-generator",
            "action=query&generator={$name}&g{$p}from=B"
                => "apihelp-$path-example-generator",
        ];
    }

    public function getHelpUrls() {
        $name = ucfirst( $this->getModuleName() );

        return "https://www.mediawiki.org/wiki/Special:MyLanguage/API:{$name}";
    }
}