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1<?php
2/**
3 * MediaWiki page data importer.
4 *
5 * Copyright © 2003,2005 Brooke Vibber <bvibber@wikimedia.org>
6 * https://www.mediawiki.org/
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21 * http://www.gnu.org/copyleft/gpl.html
22 *
23 * @file
24 * @ingroup SpecialPage
25 */
26
27use MediaWiki\Cache\CacheKeyHelper;
28use MediaWiki\Config\Config;
29use MediaWiki\Content\Content;
30use MediaWiki\Content\IContentHandlerFactory;
31use MediaWiki\Deferred\DeferredUpdates;
32use MediaWiki\Deferred\SiteStatsUpdate;
33use MediaWiki\HookContainer\HookContainer;
34use MediaWiki\HookContainer\HookRunner;
35use MediaWiki\Language\Language;
36use MediaWiki\MainConfigNames;
37use MediaWiki\Page\PageIdentity;
38use MediaWiki\Page\WikiPageFactory;
39use MediaWiki\Permissions\Authority;
40use MediaWiki\Revision\SlotRecord;
41use MediaWiki\Revision\SlotRoleRegistry;
42use MediaWiki\Status\Status;
43use MediaWiki\Title\ForeignTitle;
44use MediaWiki\Title\ImportTitleFactory;
45use MediaWiki\Title\NaiveForeignTitleFactory;
46use MediaWiki\Title\NaiveImportTitleFactory;
47use MediaWiki\Title\NamespaceAwareForeignTitleFactory;
48use MediaWiki\Title\NamespaceImportTitleFactory;
49use MediaWiki\Title\NamespaceInfo;
50use MediaWiki\Title\SubpageImportTitleFactory;
51use MediaWiki\Title\Title;
52use MediaWiki\Title\TitleFactory;
53use MediaWiki\User\ExternalUserNames;
54use Wikimedia\AtEase\AtEase;
55use Wikimedia\Message\MessageParam;
56use Wikimedia\Message\MessageSpecifier;
57use Wikimedia\NormalizedException\NormalizedException;
58use Wikimedia\Rdbms\IDBAccessObject;
59
60/**
61 * XML file reader for the page data importer.
62 *
63 * implements Special:Import
64 * @ingroup SpecialPage
65 */
66class WikiImporter {
67    /** @var XMLReader|null */
68    private $reader;
69
70    /** @var string */
71    private $sourceAdapterId;
72
73    /** @var array|null */
74    private $foreignNamespaces = null;
75
76    /** @var callable|null */
77    private $mLogItemCallback;
78
79    /** @var callable */
80    private $mUploadCallback;
81
82    /** @var callable|null */
83    private $mRevisionCallback;
84
85    /** @var callable|null */
86    private $mPageCallback;
87
88    /** @var callable|null */
89    private $mSiteInfoCallback;
90
91    /** @var callable|null */
92    private $mPageOutCallback;
93
94    /** @var callable|null */
95    private $mNoticeCallback;
96
97    /** @var bool|null */
98    private $mDebug;
99
100    /** @var bool|null */
101    private $mImportUploads;
102
103    /** @var string|null */
104    private $mImageBasePath;
105
106    /** @var bool */
107    private $mNoUpdates = false;
108
109    /** @var int */
110    private $pageOffset = 0;
111
112    private ImportTitleFactory $importTitleFactory;
113    private ExternalUserNames $externalUserNames;
114
115    /** @var array */
116    private $countableCache = [];
117
118    /** @var bool */
119    private $disableStatisticsUpdate = false;
120
121    /**
122     * Authority used for permission checks only (to ensure that the user performing the import is
123     * allowed to edit the pages they're importing). To skip the checks, use UltimateAuthority.
124     *
125     * If you want to also log the import actions, see ImportReporter.
126     */
127    private Authority $performer;
128
129    private Config $config;
130    private HookRunner $hookRunner;
131    private Language $contentLanguage;
132    private NamespaceInfo $namespaceInfo;
133    private TitleFactory $titleFactory;
134    private WikiPageFactory $wikiPageFactory;
135    private UploadRevisionImporter $uploadRevisionImporter;
136    private IContentHandlerFactory $contentHandlerFactory;
137    private SlotRoleRegistry $slotRoleRegistry;
138
139    /**
140     * Creates an ImportXMLReader drawing from the source provided
141     */
142    public function __construct(
143        ImportSource $source,
144        Authority $performer,
145        Config $config,
146        HookContainer $hookContainer,
147        Language $contentLanguage,
148        NamespaceInfo $namespaceInfo,
149        TitleFactory $titleFactory,
150        WikiPageFactory $wikiPageFactory,
151        UploadRevisionImporter $uploadRevisionImporter,
152        IContentHandlerFactory $contentHandlerFactory,
153        SlotRoleRegistry $slotRoleRegistry
154    ) {
155        $this->performer = $performer;
156        $this->config = $config;
157        $this->hookRunner = new HookRunner( $hookContainer );
158        $this->contentLanguage = $contentLanguage;
159        $this->namespaceInfo = $namespaceInfo;
160        $this->titleFactory = $titleFactory;
161        $this->wikiPageFactory = $wikiPageFactory;
162        $this->uploadRevisionImporter = $uploadRevisionImporter;
163        $this->contentHandlerFactory = $contentHandlerFactory;
164        $this->slotRoleRegistry = $slotRoleRegistry;
165
166        if ( !in_array( 'uploadsource', stream_get_wrappers() ) ) {
167            stream_wrapper_register( 'uploadsource', UploadSourceAdapter::class );
168        }
169        $this->sourceAdapterId = UploadSourceAdapter::registerSource( $source );
170
171        $this->openReader();
172
173        // Default callbacks
174        $this->setPageCallback( [ $this, 'beforeImportPage' ] );
175        $this->setRevisionCallback( [ $this, "importRevision" ] );
176        $this->setUploadCallback( [ $this, 'importUpload' ] );
177        $this->setLogItemCallback( [ $this, 'importLogItem' ] );
178        $this->setPageOutCallback( [ $this, 'finishImportPage' ] );
179
180        $this->importTitleFactory = new NaiveImportTitleFactory(
181            $this->contentLanguage,
182            $this->namespaceInfo,
183            $this->titleFactory
184        );
185        $this->externalUserNames = new ExternalUserNames( 'imported', false );
186    }
187
188    /**
189     * @return null|XMLReader
190     */
191    public function getReader() {
192        return $this->reader;
193    }
194
195    /**
196     * @param string $err
197     */
198    public function throwXmlError( $err ) {
199        $this->debug( "FAILURE: $err" );
200        wfDebug( "WikiImporter XML error: $err" );
201    }
202
203    /**
204     * @param string $data
205     */
206    public function debug( $data ) {
207        if ( $this->mDebug ) {
208            wfDebug( "IMPORT: $data" );
209        }
210    }
211
212    /**
213     * @param string $data
214     */
215    public function warn( $data ) {
216        wfDebug( "IMPORT: $data" );
217    }
218
219    /**
220     * @param string $msg
221     * @phpcs:ignore Generic.Files.LineLength
222     * @param MessageParam|MessageSpecifier|string|int|float|list<MessageParam|MessageSpecifier|string|int|float> ...$params
223     *   See Message::params()
224     */
225    public function notice( $msg, ...$params ) {
226        if ( is_callable( $this->mNoticeCallback ) ) {
227            call_user_func( $this->mNoticeCallback, $msg, $params );
228        } else { # No ImportReporter -> CLI
229            // T177997: the command line importers should call setNoticeCallback()
230            // for their own custom callback to echo the notice
231            wfDebug( wfMessage( $msg, $params )->text() );
232        }
233    }
234
235    /**
236     * Set debug mode...
237     * @param bool $debug
238     */
239    public function setDebug( $debug ) {
240        $this->mDebug = $debug;
241    }
242
243    /**
244     * Set 'no updates' mode. In this mode, the link tables will not be updated by the importer
245     * @param bool $noupdates
246     */
247    public function setNoUpdates( $noupdates ) {
248        $this->mNoUpdates = $noupdates;
249    }
250
251    /**
252     * Sets 'pageOffset' value. So it will skip the first n-1 pages
253     * and start from the nth page. It's 1-based indexing.
254     * @param int $nthPage
255     * @since 1.29
256     */
257    public function setPageOffset( $nthPage ) {
258        $this->pageOffset = $nthPage;
259    }
260
261    /**
262     * Set a callback that displays notice messages
263     *
264     * @param callable $callback
265     * @return callable
266     */
267    public function setNoticeCallback( $callback ) {
268        return wfSetVar( $this->mNoticeCallback, $callback );
269    }
270
271    /**
272     * Sets the action to perform as each new page in the stream is reached.
273     * @param callable|null $callback
274     * @return callable|null
275     */
276    public function setPageCallback( $callback ) {
277        $previous = $this->mPageCallback;
278        $this->mPageCallback = $callback;
279        return $previous;
280    }
281
282    /**
283     * Sets the action to perform as each page in the stream is completed.
284     * Callback accepts the page title (as a Title object), a second object
285     * with the original title form (in case it's been overridden into a
286     * local namespace), and a count of revisions.
287     *
288     * @param callable|null $callback
289     * @return callable|null
290     */
291    public function setPageOutCallback( $callback ) {
292        $previous = $this->mPageOutCallback;
293        $this->mPageOutCallback = $callback;
294        return $previous;
295    }
296
297    /**
298     * Sets the action to perform as each page revision is reached.
299     * @param callable|null $callback
300     * @return callable|null
301     */
302    public function setRevisionCallback( $callback ) {
303        $previous = $this->mRevisionCallback;
304        $this->mRevisionCallback = $callback;
305        return $previous;
306    }
307
308    /**
309     * Sets the action to perform as each file upload version is reached.
310     * @param callable $callback
311     * @return callable
312     */
313    public function setUploadCallback( $callback ) {
314        $previous = $this->mUploadCallback;
315        $this->mUploadCallback = $callback;
316        return $previous;
317    }
318
319    /**
320     * Sets the action to perform as each log item reached.
321     * @param callable $callback
322     * @return callable
323     */
324    public function setLogItemCallback( $callback ) {
325        $previous = $this->mLogItemCallback;
326        $this->mLogItemCallback = $callback;
327        return $previous;
328    }
329
330    /**
331     * Sets the action to perform when site info is encountered
332     * @param callable $callback
333     * @return callable
334     */
335    public function setSiteInfoCallback( $callback ) {
336        $previous = $this->mSiteInfoCallback;
337        $this->mSiteInfoCallback = $callback;
338        return $previous;
339    }
340
341    /**
342     * Sets the factory object to use to convert ForeignTitle objects into local
343     * Title objects
344     * @param ImportTitleFactory $factory
345     */
346    public function setImportTitleFactory( $factory ) {
347        $this->importTitleFactory = $factory;
348    }
349
350    /**
351     * Set a target namespace to override the defaults
352     * @param null|int $namespace
353     * @return bool
354     */
355    public function setTargetNamespace( $namespace ) {
356        if ( $namespace === null ) {
357            // Don't override namespaces
358            $this->setImportTitleFactory(
359                new NaiveImportTitleFactory(
360                    $this->contentLanguage,
361                    $this->namespaceInfo,
362                    $this->titleFactory
363                )
364            );
365            return true;
366        } elseif (
367            $namespace >= 0 &&
368            $this->namespaceInfo->exists( intval( $namespace ) )
369        ) {
370            $namespace = intval( $namespace );
371            $this->setImportTitleFactory(
372                new NamespaceImportTitleFactory(
373                    $this->namespaceInfo,
374                    $this->titleFactory,
375                    $namespace
376                )
377            );
378            return true;
379        } else {
380            return false;
381        }
382    }
383
384    /**
385     * Set a target root page under which all pages are imported
386     * @param null|string $rootpage
387     * @return Status
388     */
389    public function setTargetRootPage( $rootpage ) {
390        $status = Status::newGood();
391        $nsInfo = $this->namespaceInfo;
392        if ( $rootpage === null ) {
393            // No rootpage
394            $this->setImportTitleFactory(
395                new NaiveImportTitleFactory(
396                    $this->contentLanguage,
397                    $nsInfo,
398                    $this->titleFactory
399                )
400            );
401        } elseif ( $rootpage !== '' ) {
402            $rootpage = rtrim( $rootpage, '/' ); // avoid double slashes
403            $title = Title::newFromText( $rootpage );
404
405            if ( !$title || $title->isExternal() ) {
406                $status->fatal( 'import-rootpage-invalid' );
407            } elseif ( !$nsInfo->hasSubpages( $title->getNamespace() ) ) {
408                $displayNSText = $title->getNamespace() === NS_MAIN
409                    ? wfMessage( 'blanknamespace' )->text()
410                    : $this->contentLanguage->getNsText( $title->getNamespace() );
411                $status->fatal( 'import-rootpage-nosubpage', $displayNSText );
412            } else {
413                // set namespace to 'all', so the namespace check in processTitle() can pass
414                $this->setTargetNamespace( null );
415                $this->setImportTitleFactory(
416                    new SubpageImportTitleFactory(
417                        $nsInfo,
418                        $this->titleFactory,
419                        $title
420                    )
421                );
422            }
423        }
424        return $status;
425    }
426
427    /**
428     * @param string $dir
429     */
430    public function setImageBasePath( $dir ) {
431        $this->mImageBasePath = $dir;
432    }
433
434    /**
435     * @param bool $import
436     */
437    public function setImportUploads( $import ) {
438        $this->mImportUploads = $import;
439    }
440
441    /**
442     * @since 1.31
443     * @param string $usernamePrefix Prefix to apply to unknown (and possibly also known) usernames
444     * @param bool $assignKnownUsers Whether to apply the prefix to usernames that exist locally
445     */
446    public function setUsernamePrefix( $usernamePrefix, $assignKnownUsers ) {
447        $this->externalUserNames = new ExternalUserNames( $usernamePrefix, $assignKnownUsers );
448    }
449
450    /**
451     * Statistics update can cause a lot of time
452     * @since 1.29
453     */
454    public function disableStatisticsUpdate() {
455        $this->disableStatisticsUpdate = true;
456    }
457
458    /**
459     * Default per-page callback. Sets up some things related to site statistics
460     * @param array $titleAndForeignTitle Two-element array, with Title object at
461     * index 0 and ForeignTitle object at index 1
462     * @return bool
463     */
464    public function beforeImportPage( $titleAndForeignTitle ) {
465        $title = $titleAndForeignTitle[0];
466        $page = $this->wikiPageFactory->newFromTitle( $title );
467        $this->countableCache['title_' . $title->getPrefixedText()] = $page->isCountable();
468        return true;
469    }
470
471    /**
472     * Default per-revision callback, performs the import.
473     * @param WikiRevision $revision
474     * @return bool
475     */
476    public function importRevision( $revision ) {
477        if ( !$revision->getContentHandler()->canBeUsedOn( $revision->getTitle() ) ) {
478            $this->notice( 'import-error-bad-location',
479                $revision->getTitle()->getPrefixedText(),
480                $revision->getID(),
481                $revision->getModel(),
482                $revision->getFormat()
483            );
484
485            return false;
486        }
487
488        try {
489            return $revision->importOldRevision();
490        } catch ( MWContentSerializationException $ex ) {
491            $this->notice( 'import-error-unserialize',
492                $revision->getTitle()->getPrefixedText(),
493                $revision->getID(),
494                $revision->getModel(),
495                $revision->getFormat()
496            );
497        }
498
499        return false;
500    }
501
502    /**
503     * Default per-revision callback, performs the import.
504     * @param WikiRevision $revision
505     * @return bool
506     */
507    public function importLogItem( $revision ) {
508        return $revision->importLogItem();
509    }
510
511    /**
512     * Dummy for now...
513     * @param WikiRevision $revision
514     * @return bool
515     */
516    public function importUpload( $revision ) {
517        $status = $this->uploadRevisionImporter->import( $revision );
518        return $status->isGood();
519    }
520
521    /**
522     * Mostly for hook use
523     * @param PageIdentity $pageIdentity
524     * @param ForeignTitle $foreignTitle
525     * @param int $revCount
526     * @param int $sRevCount
527     * @param array $pageInfo
528     * @return bool
529     */
530    public function finishImportPage( PageIdentity $pageIdentity, $foreignTitle, $revCount,
531        $sRevCount, $pageInfo
532    ) {
533        // Update article count statistics (T42009)
534        // The normal counting logic in WikiPage->doEditUpdates() is designed for
535        // one-revision-at-a-time editing, not bulk imports. In this situation it
536        // suffers from issues of replica DB lag. We let WikiPage handle the total page
537        // and revision count, and we implement our own custom logic for the
538        // article (content page) count.
539        if ( !$this->disableStatisticsUpdate ) {
540            $page = $this->wikiPageFactory->newFromTitle( $pageIdentity );
541
542            $page->loadPageData( IDBAccessObject::READ_LATEST );
543            $rev = $page->getRevisionRecord();
544            if ( $rev === null ) {
545
546                wfDebug( __METHOD__ . ': Skipping article count adjustment for ' . $pageIdentity .
547                    ' because WikiPage::getRevisionRecord() returned null' );
548            } else {
549                $update = $page->newPageUpdater( $this->performer )->prepareUpdate();
550                $countKey = 'title_' . CacheKeyHelper::getKeyForPage( $pageIdentity );
551                $countable = $update->isCountable();
552                if ( array_key_exists( $countKey, $this->countableCache ) &&
553                    $countable != $this->countableCache[$countKey] ) {
554                    DeferredUpdates::addUpdate( SiteStatsUpdate::factory( [
555                        'articles' => ( (int)$countable - (int)$this->countableCache[$countKey] )
556                    ] ) );
557                }
558            }
559        }
560
561        $title = Title::newFromPageIdentity( $pageIdentity );
562        return $this->hookRunner->onAfterImportPage( $title, $foreignTitle,
563            $revCount, $sRevCount, $pageInfo );
564    }
565
566    /**
567     * Notify the callback function of site info
568     * @param array $siteInfo
569     * @return mixed|false
570     */
571    private function siteInfoCallback( $siteInfo ) {
572        if ( $this->mSiteInfoCallback ) {
573            return call_user_func_array(
574                $this->mSiteInfoCallback,
575                [ $siteInfo, $this ]
576            );
577        } else {
578            return false;
579        }
580    }
581
582    /**
583     * Notify the callback function when a new "<page>" is reached.
584     * @param array $title
585     */
586    public function pageCallback( $title ) {
587        if ( $this->mPageCallback ) {
588            call_user_func( $this->mPageCallback, $title );
589        }
590    }
591
592    /**
593     * Notify the callback function when a "</page>" is closed.
594     * @param PageIdentity $pageIdentity
595     * @param ForeignTitle $foreignTitle
596     * @param int $revCount
597     * @param int $sucCount Number of revisions for which callback returned true
598     * @param array $pageInfo Associative array of page information
599     */
600    private function pageOutCallback( PageIdentity $pageIdentity, $foreignTitle, $revCount,
601            $sucCount, $pageInfo ) {
602        if ( $this->mPageOutCallback ) {
603            call_user_func_array( $this->mPageOutCallback, func_get_args() );
604        }
605    }
606
607    /**
608     * Notify the callback function of a revision
609     * @param WikiRevision $revision
610     * @return bool|mixed
611     */
612    private function revisionCallback( $revision ) {
613        if ( $this->mRevisionCallback ) {
614            return call_user_func_array(
615                $this->mRevisionCallback,
616                [ $revision, $this ]
617            );
618        } else {
619            return false;
620        }
621    }
622
623    /**
624     * Notify the callback function of a new log item
625     * @param WikiRevision $revision
626     * @return mixed|false
627     */
628    private function logItemCallback( $revision ) {
629        if ( $this->mLogItemCallback ) {
630            return call_user_func_array(
631                $this->mLogItemCallback,
632                [ $revision, $this ]
633            );
634        } else {
635            return false;
636        }
637    }
638
639    /**
640     * Retrieves the contents of the named attribute of the current element.
641     * @param string $attr The name of the attribute
642     * @return string The value of the attribute or an empty string if it is not set in the current
643     * element.
644     */
645    public function nodeAttribute( $attr ) {
646        return $this->reader->getAttribute( $attr ) ?? '';
647    }
648
649    /**
650     * Shouldn't something like this be built-in to XMLReader?
651     * Fetches text contents of the current element, assuming
652     * no sub-elements or such scary things.
653     * @return string
654     * @internal
655     */
656    public function nodeContents() {
657        if ( $this->reader->isEmptyElement ) {
658            return "";
659        }
660        $buffer = "";
661        while ( $this->reader->read() ) {
662            switch ( $this->reader->nodeType ) {
663                case XMLReader::TEXT:
664                case XMLReader::CDATA:
665                case XMLReader::SIGNIFICANT_WHITESPACE:
666                    $buffer .= $this->reader->value;
667                    break;
668                case XMLReader::END_ELEMENT:
669                    return $buffer;
670            }
671        }
672
673        $this->reader->close();
674        return '';
675    }
676
677    /**
678     * Primary entry point
679     * @throws Exception
680     * @return bool
681     */
682    public function doImport() {
683        $this->syntaxCheckXML();
684
685        // Calls to reader->read need to be wrapped in calls to
686        // libxml_disable_entity_loader() to avoid local file
687        // inclusion attacks (T48932).
688        // phpcs:ignore Generic.PHP.NoSilencedErrors -- suppress deprecation per T268847
689        $oldDisable = @libxml_disable_entity_loader( true );
690        try {
691            $this->reader->read();
692
693            if ( $this->reader->localName != 'mediawiki' ) {
694                // phpcs:ignore Generic.PHP.NoSilencedErrors
695                @libxml_disable_entity_loader( $oldDisable );
696                $error = libxml_get_last_error();
697                if ( $error ) {
698                    throw new NormalizedException( "XML error at line {line}: {message}", [
699                        'line' => $error->line,
700                        'message' => $error->message,
701                    ] );
702                } else {
703                    throw new UnexpectedValueException(
704                        "Expected '<mediawiki>' tag, got '<{$this->reader->localName}>' tag."
705                    );
706                }
707            }
708            $this->debug( "<mediawiki> tag is correct." );
709
710            $this->debug( "Starting primary dump processing loop." );
711
712            $keepReading = $this->reader->read();
713            $skip = false;
714            $pageCount = 0;
715            while ( $keepReading ) {
716                $tag = $this->reader->localName;
717                if ( $this->pageOffset ) {
718                    if ( $tag === 'page' ) {
719                        $pageCount++;
720                    }
721                    if ( $pageCount < $this->pageOffset ) {
722                        $keepReading = $this->reader->next();
723                        continue;
724                    }
725                }
726                $type = $this->reader->nodeType;
727
728                if ( !$this->hookRunner->onImportHandleToplevelXMLTag( $this ) ) {
729                    // Do nothing
730                } elseif ( $tag == 'mediawiki' && $type == XMLReader::END_ELEMENT ) {
731                    break;
732                } elseif ( $tag == 'siteinfo' ) {
733                    $this->handleSiteInfo();
734                } elseif ( $tag == 'page' ) {
735                    $this->handlePage();
736                } elseif ( $tag == 'logitem' ) {
737                    $this->handleLogItem();
738                } elseif ( $tag != '#text' ) {
739                    $this->warn( "Unhandled top-level XML tag $tag" );
740
741                    $skip = true;
742                }
743
744                if ( $skip ) {
745                    $keepReading = $this->reader->next();
746                    $skip = false;
747                    $this->debug( "Skip" );
748                } else {
749                    $keepReading = $this->reader->read();
750                }
751            }
752        } finally {
753            // phpcs:ignore Generic.PHP.NoSilencedErrors
754            @libxml_disable_entity_loader( $oldDisable );
755            $this->reader->close();
756        }
757
758        return true;
759    }
760
761    private function handleSiteInfo() {
762        $this->debug( "Enter site info handler." );
763        $siteInfo = [];
764
765        // Fields that can just be stuffed in the siteInfo object
766        $normalFields = [ 'sitename', 'base', 'generator', 'case' ];
767
768        while ( $this->reader->read() ) {
769            if ( $this->reader->nodeType == XMLReader::END_ELEMENT &&
770                    $this->reader->localName == 'siteinfo' ) {
771                break;
772            }
773
774            $tag = $this->reader->localName;
775
776            if ( $tag == 'namespace' ) {
777                $this->foreignNamespaces[$this->nodeAttribute( 'key' )] =
778                    $this->nodeContents();
779            } elseif ( in_array( $tag, $normalFields ) ) {
780                $siteInfo[$tag] = $this->nodeContents();
781            }
782        }
783
784        $siteInfo['_namespaces'] = $this->foreignNamespaces;
785        $this->siteInfoCallback( $siteInfo );
786    }
787
788    private function handleLogItem() {
789        $this->debug( "Enter log item handler." );
790        $logInfo = [];
791
792        // Fields that can just be stuffed in the pageInfo object
793        $normalFields = [ 'id', 'comment', 'type', 'action', 'timestamp',
794            'logtitle', 'params' ];
795
796        while ( $this->reader->read() ) {
797            if ( $this->reader->nodeType == XMLReader::END_ELEMENT &&
798                    $this->reader->localName == 'logitem' ) {
799                break;
800            }
801
802            $tag = $this->reader->localName;
803
804            if ( !$this->hookRunner->onImportHandleLogItemXMLTag( $this, $logInfo ) ) {
805                // Do nothing
806            } elseif ( in_array( $tag, $normalFields ) ) {
807                $logInfo[$tag] = $this->nodeContents();
808            } elseif ( $tag == 'contributor' ) {
809                $logInfo['contributor'] = $this->handleContributor();
810            } elseif ( $tag != '#text' ) {
811                $this->warn( "Unhandled log-item XML tag $tag" );
812            }
813        }
814
815        $this->processLogItem( $logInfo );
816    }
817
818    /**
819     * @param array $logInfo
820     * @return mixed|false
821     */
822    private function processLogItem( $logInfo ) {
823        $revision = new WikiRevision();
824
825        if ( isset( $logInfo['id'] ) ) {
826            $revision->setID( $logInfo['id'] );
827        }
828        $revision->setType( $logInfo['type'] );
829        $revision->setAction( $logInfo['action'] );
830        if ( isset( $logInfo['timestamp'] ) ) {
831            $revision->setTimestamp( $logInfo['timestamp'] );
832        }
833        if ( isset( $logInfo['params'] ) ) {
834            $revision->setParams( $logInfo['params'] );
835        }
836        if ( isset( $logInfo['logtitle'] ) ) {
837            // @todo Using Title for non-local titles is a recipe for disaster.
838            // We should use ForeignTitle here instead.
839            $revision->setTitle( Title::newFromText( $logInfo['logtitle'] ) );
840        }
841
842        $revision->setNoUpdates( $this->mNoUpdates );
843
844        if ( isset( $logInfo['comment'] ) ) {
845            $revision->setComment( $logInfo['comment'] );
846        }
847
848        if ( isset( $logInfo['contributor']['username'] ) ) {
849            $revision->setUsername(
850                $this->externalUserNames->applyPrefix( $logInfo['contributor']['username'] )
851            );
852        } elseif ( isset( $logInfo['contributor']['ip'] ) ) {
853            $revision->setUserIP( $logInfo['contributor']['ip'] );
854        } else {
855            $revision->setUsername( $this->externalUserNames->addPrefix( 'Unknown user' ) );
856        }
857
858        return $this->logItemCallback( $revision );
859    }
860
861    private function handlePage() {
862        // Handle page data.
863        $this->debug( "Enter page handler." );
864        $pageInfo = [ 'revisionCount' => 0, 'successfulRevisionCount' => 0 ];
865
866        // Fields that can just be stuffed in the pageInfo object
867        $normalFields = [ 'title', 'ns', 'id', 'redirect', 'restrictions' ];
868
869        $skip = false;
870        $badTitle = false;
871
872        while ( $skip ? $this->reader->next() : $this->reader->read() ) {
873            if ( $this->reader->nodeType == XMLReader::END_ELEMENT &&
874                    $this->reader->localName == 'page' ) {
875                break;
876            }
877
878            $skip = false;
879
880            $tag = $this->reader->localName;
881
882            if ( $badTitle ) {
883                // The title is invalid, bail out of this page
884                $skip = true;
885            } elseif ( !$this->hookRunner->onImportHandlePageXMLTag( $this, $pageInfo ) ) {
886                // Do nothing
887            } elseif ( in_array( $tag, $normalFields ) ) {
888                // An XML snippet:
889                // <page>
890                //     <id>123</id>
891                //     <title>Page</title>
892                //     <redirect title="NewTitle"/>
893                //     ...
894                // Because the redirect tag is built differently, we need special handling for that case.
895                if ( $tag == 'redirect' ) {
896                    $pageInfo[$tag] = $this->nodeAttribute( 'title' );
897                } else {
898                    $pageInfo[$tag] = $this->nodeContents();
899                }
900            } elseif ( $tag == 'revision' || $tag == 'upload' ) {
901                if ( !isset( $title ) ) {
902                    $title = $this->processTitle( $pageInfo['title'],
903                        $pageInfo['ns'] ?? null );
904
905                    // $title is either an array of two titles or false.
906                    if ( is_array( $title ) ) {
907                        $this->pageCallback( $title );
908                        [ $pageInfo['_title'], $foreignTitle ] = $title;
909                    } else {
910                        $badTitle = true;
911                        $skip = true;
912                    }
913                }
914
915                if ( $title ) {
916                    if ( $tag == 'revision' ) {
917                        $this->handleRevision( $pageInfo );
918                    } else {
919                        $this->handleUpload( $pageInfo );
920                    }
921                }
922            } elseif ( $tag != '#text' ) {
923                $this->warn( "Unhandled page XML tag $tag" );
924                $skip = true;
925            }
926        }
927
928        // @note $pageInfo is only set if a valid $title is processed above with
929        //       no error. If we have a valid $title, then pageCallback is called
930        //       above, $pageInfo['title'] is set and we do pageOutCallback here.
931        //       If $pageInfo['_title'] is not set, then $foreignTitle is also not
932        //       set since they both come from $title above.
933        if ( array_key_exists( '_title', $pageInfo ) ) {
934            /** @var Title $title */
935            $title = $pageInfo['_title'];
936            $this->pageOutCallback(
937                $title,
938                // @phan-suppress-next-line PhanPossiblyUndeclaredVariable Set together with _title key
939                $foreignTitle,
940                $pageInfo['revisionCount'],
941                $pageInfo['successfulRevisionCount'],
942                $pageInfo
943            );
944        }
945    }
946
947    /**
948     * @param array &$pageInfo
949     */
950    private function handleRevision( &$pageInfo ) {
951        $this->debug( "Enter revision handler" );
952        $revisionInfo = [];
953
954        $normalFields = [ 'id', 'parentid', 'timestamp', 'comment', 'minor', 'origin',
955            'model', 'format', 'text', 'sha1' ];
956
957        $skip = false;
958
959        while ( $skip ? $this->reader->next() : $this->reader->read() ) {
960            if ( $this->reader->nodeType == XMLReader::END_ELEMENT &&
961                    $this->reader->localName == 'revision' ) {
962                break;
963            }
964
965            $tag = $this->reader->localName;
966
967            if ( !$this->hookRunner->onImportHandleRevisionXMLTag(
968                $this, $pageInfo, $revisionInfo )
969            ) {
970                // Do nothing
971            } elseif ( in_array( $tag, $normalFields ) ) {
972                $revisionInfo[$tag] = $this->nodeContents();
973            } elseif ( $tag == 'content' ) {
974                // We can have multiple content tags, so make this an array.
975                $revisionInfo[$tag][] = $this->handleContent();
976            } elseif ( $tag == 'contributor' ) {
977                $revisionInfo['contributor'] = $this->handleContributor();
978            } elseif ( $tag != '#text' ) {
979                $this->warn( "Unhandled revision XML tag $tag" );
980                $skip = true;
981            }
982        }
983
984        $pageInfo['revisionCount']++;
985        if ( $this->processRevision( $pageInfo, $revisionInfo ) ) {
986            $pageInfo['successfulRevisionCount']++;
987        }
988    }
989
990    private function handleContent() {
991        $this->debug( "Enter content handler" );
992        $contentInfo = [];
993
994        $normalFields = [ 'role', 'origin', 'model', 'format', 'text' ];
995
996        $skip = false;
997
998        while ( $skip ? $this->reader->next() : $this->reader->read() ) {
999            if ( $this->reader->nodeType == XMLReader::END_ELEMENT &&
1000                $this->reader->localName == 'content' ) {
1001                break;
1002            }
1003
1004            $tag = $this->reader->localName;
1005
1006            if ( !$this->hookRunner->onImportHandleContentXMLTag(
1007                $this, $contentInfo )
1008            ) {
1009                // Do nothing
1010            } elseif ( in_array( $tag, $normalFields ) ) {
1011                $contentInfo[$tag] = $this->nodeContents();
1012            } elseif ( $tag != '#text' ) {
1013                $this->warn( "Unhandled content XML tag $tag" );
1014                $skip = true;
1015            }
1016        }
1017
1018        return $contentInfo;
1019    }
1020
1021    /**
1022     * @param PageIdentity $page
1023     * @param int $revisionId
1024     * @param array $contentInfo
1025     *
1026     * @return Content
1027     */
1028    private function makeContent( PageIdentity $page, $revisionId, $contentInfo ) {
1029        $maxArticleSize = $this->config->get( MainConfigNames::MaxArticleSize );
1030
1031        if ( !isset( $contentInfo['text'] ) ) {
1032            throw new InvalidArgumentException( 'Missing text field in import.' );
1033        }
1034
1035        // Make sure revisions won't violate $wgMaxArticleSize, which could lead to
1036        // database errors and instability. Testing for revisions with only listed
1037        // content models, as other content models might use serialization formats
1038        // which aren't checked against $wgMaxArticleSize.
1039        if ( ( !isset( $contentInfo['model'] ) ||
1040                in_array( $contentInfo['model'], [
1041                    'wikitext',
1042                    'css',
1043                    'json',
1044                    'javascript',
1045                    'text',
1046                    ''
1047                ] ) ) &&
1048            strlen( $contentInfo['text'] ) > $maxArticleSize * 1024
1049        ) {
1050            throw new RuntimeException( 'The text of ' .
1051                ( $revisionId ?
1052                    "the revision with ID $revisionId" :
1053                    'a revision'
1054                ) . " exceeds the maximum allowable size ({$maxArticleSize} KiB)" );
1055        }
1056
1057        $role = $contentInfo['role'] ?? SlotRecord::MAIN;
1058        $model = $contentInfo['model'] ?? $this->slotRoleRegistry
1059            ->getRoleHandler( $role )
1060            ->getDefaultModel( $page );
1061        $handler = $this->contentHandlerFactory->getContentHandler( $model );
1062
1063        $text = $handler->importTransform( $contentInfo['text'] );
1064
1065        return $handler->unserializeContent( $text );
1066    }
1067
1068    /**
1069     * @param array $pageInfo
1070     * @param array $revisionInfo
1071     * @return mixed|false
1072     */
1073    private function processRevision( $pageInfo, $revisionInfo ) {
1074        $revision = new WikiRevision();
1075
1076        $revId = $revisionInfo['id'] ?? 0;
1077        if ( $revId ) {
1078            $revision->setID( $revisionInfo['id'] );
1079        }
1080
1081        $title = $pageInfo['_title'];
1082        $revision->setTitle( $title );
1083
1084        $content = $this->makeContent( $title, $revId, $revisionInfo );
1085        $revision->setContent( SlotRecord::MAIN, $content );
1086
1087        foreach ( $revisionInfo['content'] ?? [] as $slotInfo ) {
1088            if ( !isset( $slotInfo['role'] ) ) {
1089                throw new RuntimeException( "Missing role for imported slot." );
1090            }
1091
1092            $content = $this->makeContent( $title, $revId, $slotInfo );
1093            $revision->setContent( $slotInfo['role'], $content );
1094        }
1095        $revision->setTimestamp( $revisionInfo['timestamp'] ?? wfTimestampNow() );
1096
1097        if ( isset( $revisionInfo['comment'] ) ) {
1098            $revision->setComment( $revisionInfo['comment'] );
1099        }
1100
1101        if ( isset( $revisionInfo['minor'] ) ) {
1102            $revision->setMinor( true );
1103        }
1104        if ( isset( $revisionInfo['contributor']['username'] ) ) {
1105            $revision->setUsername(
1106                $this->externalUserNames->applyPrefix( $revisionInfo['contributor']['username'] )
1107            );
1108        } elseif ( isset( $revisionInfo['contributor']['ip'] ) ) {
1109            $revision->setUserIP( $revisionInfo['contributor']['ip'] );
1110        } else {
1111            $revision->setUsername( $this->externalUserNames->addPrefix( 'Unknown user' ) );
1112        }
1113        if ( isset( $revisionInfo['sha1'] ) ) {
1114            $revision->setSha1Base36( $revisionInfo['sha1'] );
1115        }
1116        $revision->setNoUpdates( $this->mNoUpdates );
1117
1118        return $this->revisionCallback( $revision );
1119    }
1120
1121    /**
1122     * @param array &$pageInfo
1123     * @return mixed
1124     */
1125    private function handleUpload( &$pageInfo ) {
1126        $this->debug( "Enter upload handler" );
1127        $uploadInfo = [];
1128
1129        $normalFields = [ 'timestamp', 'comment', 'filename', 'text',
1130            'src', 'size', 'sha1base36', 'archivename', 'rel' ];
1131
1132        $skip = false;
1133
1134        while ( $skip ? $this->reader->next() : $this->reader->read() ) {
1135            if ( $this->reader->nodeType == XMLReader::END_ELEMENT &&
1136                    $this->reader->localName == 'upload' ) {
1137                break;
1138            }
1139
1140            $tag = $this->reader->localName;
1141
1142            if ( !$this->hookRunner->onImportHandleUploadXMLTag( $this, $pageInfo ) ) {
1143                // Do nothing
1144            } elseif ( in_array( $tag, $normalFields ) ) {
1145                $uploadInfo[$tag] = $this->nodeContents();
1146            } elseif ( $tag == 'contributor' ) {
1147                $uploadInfo['contributor'] = $this->handleContributor();
1148            } elseif ( $tag == 'contents' ) {
1149                $contents = $this->nodeContents();
1150                $encoding = $this->reader->getAttribute( 'encoding' );
1151                if ( $encoding === 'base64' ) {
1152                    $uploadInfo['fileSrc'] = $this->dumpTemp( base64_decode( $contents ) );
1153                    $uploadInfo['isTempSrc'] = true;
1154                }
1155            } elseif ( $tag != '#text' ) {
1156                $this->warn( "Unhandled upload XML tag $tag" );
1157                $skip = true;
1158            }
1159        }
1160
1161        if ( $this->mImageBasePath && isset( $uploadInfo['rel'] ) ) {
1162            $path = "{$this->mImageBasePath}/{$uploadInfo['rel']}";
1163            if ( file_exists( $path ) ) {
1164                $uploadInfo['fileSrc'] = $path;
1165                $uploadInfo['isTempSrc'] = false;
1166            }
1167        }
1168
1169        if ( $this->mImportUploads ) {
1170            return $this->processUpload( $pageInfo, $uploadInfo );
1171        }
1172    }
1173
1174    /**
1175     * @param string $contents
1176     * @return string
1177     */
1178    private function dumpTemp( $contents ) {
1179        $filename = tempnam( wfTempDir(), 'importupload' );
1180        file_put_contents( $filename, $contents );
1181        return $filename;
1182    }
1183
1184    /**
1185     * @param array $pageInfo
1186     * @param array $uploadInfo
1187     * @return mixed
1188     */
1189    private function processUpload( $pageInfo, $uploadInfo ) {
1190        $revision = new WikiRevision();
1191        $revId = $pageInfo['id'];
1192        $title = $pageInfo['_title'];
1193        // T292348: text key may be absent, force addition if null
1194        $uploadInfo['text'] ??= '';
1195        $content = $this->makeContent( $title, $revId, $uploadInfo );
1196
1197        $revision->setTitle( $title );
1198        $revision->setID( $revId );
1199        $revision->setTimestamp( $uploadInfo['timestamp'] );
1200        $revision->setContent( SlotRecord::MAIN, $content );
1201        $revision->setFilename( $uploadInfo['filename'] );
1202        if ( isset( $uploadInfo['archivename'] ) ) {
1203            $revision->setArchiveName( $uploadInfo['archivename'] );
1204        }
1205        $revision->setSrc( $uploadInfo['src'] );
1206        if ( isset( $uploadInfo['fileSrc'] ) ) {
1207            $revision->setFileSrc( $uploadInfo['fileSrc'],
1208                !empty( $uploadInfo['isTempSrc'] )
1209            );
1210        }
1211        if ( isset( $uploadInfo['sha1base36'] ) ) {
1212            $revision->setSha1Base36( $uploadInfo['sha1base36'] );
1213        }
1214        $revision->setSize( intval( $uploadInfo['size'] ) );
1215        $revision->setComment( $uploadInfo['comment'] );
1216
1217        if ( isset( $uploadInfo['contributor']['username'] ) ) {
1218            $revision->setUsername(
1219                $this->externalUserNames->applyPrefix( $uploadInfo['contributor']['username'] )
1220            );
1221        } elseif ( isset( $uploadInfo['contributor']['ip'] ) ) {
1222            $revision->setUserIP( $uploadInfo['contributor']['ip'] );
1223        }
1224        $revision->setNoUpdates( $this->mNoUpdates );
1225
1226        return call_user_func( $this->mUploadCallback, $revision );
1227    }
1228
1229    /**
1230     * @return array
1231     */
1232    private function handleContributor() {
1233        $this->debug( "Enter contributor handler." );
1234
1235        if ( $this->reader->isEmptyElement ) {
1236            return [];
1237        }
1238
1239        $fields = [ 'id', 'ip', 'username' ];
1240        $info = [];
1241
1242        while ( $this->reader->read() ) {
1243            if ( $this->reader->nodeType == XMLReader::END_ELEMENT &&
1244                    $this->reader->localName == 'contributor' ) {
1245                break;
1246            }
1247
1248            $tag = $this->reader->localName;
1249
1250            if ( in_array( $tag, $fields ) ) {
1251                $info[$tag] = $this->nodeContents();
1252            }
1253        }
1254
1255        return $info;
1256    }
1257
1258    /**
1259     * @param string $text
1260     * @param string|null $ns
1261     * @return array|false
1262     */
1263    private function processTitle( $text, $ns = null ) {
1264        if ( $this->foreignNamespaces === null ) {
1265            $foreignTitleFactory = new NaiveForeignTitleFactory(
1266                $this->contentLanguage
1267            );
1268        } else {
1269            $foreignTitleFactory = new NamespaceAwareForeignTitleFactory(
1270                $this->foreignNamespaces );
1271        }
1272
1273        $foreignTitle = $foreignTitleFactory->createForeignTitle( $text,
1274            intval( $ns ) );
1275
1276        $title = $this->importTitleFactory->createTitleFromForeignTitle(
1277            $foreignTitle );
1278
1279        if ( $title === null ) {
1280            # Invalid page title? Ignore the page
1281            $this->notice( 'import-error-invalid', $foreignTitle->getFullText() );
1282            return false;
1283        } elseif ( $title->isExternal() ) {
1284            $this->notice( 'import-error-interwiki', $title->getPrefixedText() );
1285            return false;
1286        } elseif ( !$title->canExist() ) {
1287            $this->notice( 'import-error-special', $title->getPrefixedText() );
1288            return false;
1289        } elseif ( !$this->performer->definitelyCan( 'edit', $title ) ) {
1290            # Do not import if the importing wiki user cannot edit this page
1291            $this->notice( 'import-error-edit', $title->getPrefixedText() );
1292            return false;
1293        }
1294
1295        return [ $title, $foreignTitle ];
1296    }
1297
1298    /**
1299     * Open the XMLReader connected to the source adapter id
1300     * @suppress PhanStaticCallToNonStatic, UnusedSuppression -- for PHP 7.4 support
1301     */
1302    private function openReader() {
1303        // Enable the entity loader, as it is needed for loading external URLs via
1304        // XMLReader::open (T86036)
1305        // phpcs:ignore Generic.PHP.NoSilencedErrors -- suppress deprecation per T268847
1306        $oldDisable = @libxml_disable_entity_loader( false );
1307
1308        if ( PHP_VERSION_ID >= 80000 ) {
1309            // A static call is now preferred, and avoids https://github.com/php/php-src/issues/11548
1310            $reader = XMLReader::open(
1311                'uploadsource://' . $this->sourceAdapterId, null, LIBXML_PARSEHUGE );
1312            if ( $reader instanceof XMLReader ) {
1313                $this->reader = $reader;
1314                $status = true;
1315            } else {
1316                $status = false;
1317            }
1318        } else {
1319            // A static call generated a deprecation warning prior to PHP 8.0
1320            $this->reader = new XMLReader;
1321            $status = $this->reader->open(
1322                'uploadsource://' . $this->sourceAdapterId, null, LIBXML_PARSEHUGE );
1323        }
1324        if ( !$status ) {
1325            $error = libxml_get_last_error();
1326            // phpcs:ignore Generic.PHP.NoSilencedErrors
1327            @libxml_disable_entity_loader( $oldDisable );
1328            throw new RuntimeException(
1329                'Encountered an internal error while initializing WikiImporter object: ' . $error->message
1330            );
1331        }
1332        // phpcs:ignore Generic.PHP.NoSilencedErrors
1333        @libxml_disable_entity_loader( $oldDisable );
1334    }
1335
1336    /**
1337     * Check the syntax of the given xml
1338     */
1339    private function syntaxCheckXML() {
1340        if ( !UploadSourceAdapter::isSeekableSource( $this->sourceAdapterId ) ) {
1341            return;
1342        }
1343        AtEase::suppressWarnings();
1344        $oldDisable = libxml_disable_entity_loader( false );
1345        try {
1346            while ( $this->reader->read() );
1347            $error = libxml_get_last_error();
1348            if ( $error ) {
1349                $errorMessage = 'XML error at line ' . $error->line . ': ' . $error->message;
1350                wfDebug( __METHOD__ . ': Invalid xml found - ' . $errorMessage );
1351                throw new RuntimeException( $errorMessage );
1352            }
1353        } finally {
1354            libxml_disable_entity_loader( $oldDisable );
1355            AtEase::restoreWarnings();
1356            $this->reader->close();
1357        }
1358
1359        // Reopen for the real import
1360        UploadSourceAdapter::seekSource( $this->sourceAdapterId, 0 );
1361        $this->openReader();
1362    }
1363}