includes/export/XmlDumpWriter.php

   1 <?php
   2 /**
   3  * XmlDumpWriter
   4  *
   5  * Copyright © 2003, 2005, 2006 Brion Vibber <brion@pobox.com>
   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  */
  25
  26 /**
  27  * @ingroup Dump
  28  */
  29 class XmlDumpWriter {
  30         /**
  31          * Opens the XML output stream's root "<mediawiki>" element.
  32          * This does not include an xml directive, so is safe to include
  33          * as a subelement in a larger XML stream. Namespace and XML Schema
  34          * references are included.
  35          *
  36          * Output will be encoded in UTF-8.
  37          *
  38          * @return string
  39          */
  40         function openStream() {
  41                 global $wgContLang;
  42                 $ver = WikiExporter::schemaVersion();
  43                 return Xml::element( 'mediawiki', [
  44                         'xmlns'              => "http://www.mediawiki.org/xml/export-$ver/",
  45                         'xmlns:xsi'          => "http://www.w3.org/2001/XMLSchema-instance",
  46                         /*
  47                          * When a new version of the schema is created, it needs staging on mediawiki.org.
  48                          * This requires a change in the operations/mediawiki-config git repo.
  49                          *
  50                          * Create a changeset like https://gerrit.wikimedia.org/r/#/c/149643/ in which
  51                          * you copy in the new xsd file.
  52                          *
  53                          * After it is reviewed, merged and deployed (sync-docroot), the index.html needs purging.
  54                          * echo "https://www.mediawiki.org/xml/index.html" | mwscript purgeList.php --wiki=aawiki
  55                          */
  56                         'xsi:schemaLocation' => "http://www.mediawiki.org/xml/export-$ver/ " .
  57                                 "http://www.mediawiki.org/xml/export-$ver.xsd",
  58                         'version'            => $ver,
  59                         'xml:lang'           => $wgContLang->getHtmlCode() ],
  60                         null ) .
  61                         "\n" .
  62                         $this->siteInfo();
  63         }
  64
  65         /**
  66          * @return string
  67          */
  68         function siteInfo() {
  69                 $info = [
  70                         $this->sitename(),
  71                         $this->dbname(),
  72                         $this->homelink(),
  73                         $this->generator(),
  74                         $this->caseSetting(),
  75                         $this->namespaces() ];
  76                 return "  <siteinfo>\n    " .
  77                         implode( "\n    ", $info ) .
  78                         "\n  </siteinfo>\n";
  79         }
  80
  81         /**
  82          * @return string
  83          */
  84         function sitename() {
  85                 global $wgSitename;
  86                 return Xml::element( 'sitename', [], $wgSitename );
  87         }
  88
  89         /**
  90          * @return string
  91          */
  92         function dbname() {
  93                 global $wgDBname;
  94                 return Xml::element( 'dbname', [], $wgDBname );
  95         }
  96
  97         /**
  98          * @return string
  99          */
 100         function generator() {
 101                 global $wgVersion;
 102                 return Xml::element( 'generator', [], "MediaWiki $wgVersion" );
 103         }
 104
 105         /**
 106          * @return string
 107          */
 108         function homelink() {
 109                 return Xml::element( 'base', [], Title::newMainPage()->getCanonicalURL() );
 110         }
 111
 112         /**
 113          * @return string
 114          */
 115         function caseSetting() {
 116                 global $wgCapitalLinks;
 117                 // "case-insensitive" option is reserved for future
 118                 $sensitivity = $wgCapitalLinks ? 'first-letter' : 'case-sensitive';
 119                 return Xml::element( 'case', [], $sensitivity );
 120         }
 121
 122         /**
 123          * @return string
 124          */
 125         function namespaces() {
 126                 global $wgContLang;
 127                 $spaces = "<namespaces>\n";
 128                 foreach ( $wgContLang->getFormattedNamespaces() as $ns => $title ) {
 129                         $spaces .= '      ' .
 130                                 Xml::element( 'namespace',
 131                                         [
 132                                                 'key' => $ns,
 133                                                 'case' => MWNamespace::isCapitalized( $ns ) ? 'first-letter' : 'case-sensitive',
 134                                         ], $title ) . "\n";
 135                 }
 136                 $spaces .= "    </namespaces>";
 137                 return $spaces;
 138         }
 139
 140         /**
 141          * Closes the output stream with the closing root element.
 142          * Call when finished dumping things.
 143          *
 144          * @return string
 145          */
 146         function closeStream() {
 147                 return "</mediawiki>\n";
 148         }
 149
 150         /**
 151          * Opens a "<page>" section on the output stream, with data
 152          * from the given database row.
 153          *
 154          * @param object $row
 155          * @return string
 156          */
 157         public function openPage( $row ) {
 158                 $out = "  <page>\n";
 159                 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 160                 $out .= '    ' . Xml::elementClean( 'title', [], self::canonicalTitle( $title ) ) . "\n";
 161                 $out .= '    ' . Xml::element( 'ns', [], strval( $row->page_namespace ) ) . "\n";
 162                 $out .= '    ' . Xml::element( 'id', [], strval( $row->page_id ) ) . "\n";
 163                 if ( $row->page_is_redirect ) {
 164                         $page = WikiPage::factory( $title );
 165                         $redirect = $page->getRedirectTarget();
 166                         if ( $redirect instanceof Title && $redirect->isValidRedirectTarget() ) {
 167                                 $out .= '    ';
 168                                 $out .= Xml::element( 'redirect', [ 'title' => self::canonicalTitle( $redirect ) ] );
 169                                 $out .= "\n";
 170                         }
 171                 }
 172
 173                 if ( $row->page_restrictions != '' ) {
 174                         $out .= '    ' . Xml::element( 'restrictions', [],
 175                                 strval( $row->page_restrictions ) ) . "\n";
 176                 }
 177
 178                 Hooks::run( 'XmlDumpWriterOpenPage', [ $this, &$out, $row, $title ] );
 179
 180                 return $out;
 181         }
 182
 183         /**
 184          * Closes a "<page>" section on the output stream.
 185          *
 186          * @access private
 187          * @return string
 188          */
 189         function closePage() {
 190                 return "  </page>\n";
 191         }
 192
 193         /**
 194          * Dumps a "<revision>" section on the output stream, with
 195          * data filled in from the given database row.
 196          *
 197          * @param object $row
 198          * @return string
 199          * @access private
 200          */
 201         function writeRevision( $row ) {
 202                 $out = "    <revision>\n";
 203                 $out .= "      " . Xml::element( 'id', null, strval( $row->rev_id ) ) . "\n";
 204                 if ( isset( $row->rev_parent_id ) && $row->rev_parent_id ) {
 205                         $out .= "      " . Xml::element( 'parentid', null, strval( $row->rev_parent_id ) ) . "\n";
 206                 }
 207
 208                 $out .= $this->writeTimestamp( $row->rev_timestamp );
 209
 210                 if ( isset( $row->rev_deleted ) && ( $row->rev_deleted & Revision::DELETED_USER ) ) {
 211                         $out .= "      " . Xml::element( 'contributor', [ 'deleted' => 'deleted' ] ) . "\n";
 212                 } else {
 213                         $out .= $this->writeContributor( $row->rev_user, $row->rev_user_text );
 214                 }
 215
 216                 if ( isset( $row->rev_minor_edit ) && $row->rev_minor_edit ) {
 217                         $out .= "      <minor/>\n";
 218                 }
 219                 if ( isset( $row->rev_deleted ) && ( $row->rev_deleted & Revision::DELETED_COMMENT ) ) {
 220                         $out .= "      " . Xml::element( 'comment', [ 'deleted' => 'deleted' ] ) . "\n";
 221                 } else {
 222                         $comment = CommentStore::newKey( 'rev_comment' )->getComment( $row )->text;
 223                         if ( $comment != '' ) {
 224                                 $out .= "      " . Xml::elementClean( 'comment', [], strval( $comment ) ) . "\n";
 225                         }
 226                 }
 227
 228                 if ( isset( $row->rev_content_model ) && !is_null( $row->rev_content_model ) ) {
 229                         $content_model = strval( $row->rev_content_model );
 230                 } else {
 231                         // probably using $wgContentHandlerUseDB = false;
 232                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 233                         $content_model = ContentHandler::getDefaultModelFor( $title );
 234                 }
 235
 236                 $content_handler = ContentHandler::getForModelID( $content_model );
 237
 238                 if ( isset( $row->rev_content_format ) && !is_null( $row->rev_content_format ) ) {
 239                         $content_format = strval( $row->rev_content_format );
 240                 } else {
 241                         // probably using $wgContentHandlerUseDB = false;
 242                         $content_format = $content_handler->getDefaultFormat();
 243                 }
 244
 245                 $out .= "      " . Xml::element( 'model', null, strval( $content_model ) ) . "\n";
 246                 $out .= "      " . Xml::element( 'format', null, strval( $content_format ) ) . "\n";
 247
 248                 $text = '';
 249                 if ( isset( $row->rev_deleted ) && ( $row->rev_deleted & Revision::DELETED_TEXT ) ) {
 250                         $out .= "      " . Xml::element( 'text', [ 'deleted' => 'deleted' ] ) . "\n";
 251                 } elseif ( isset( $row->old_text ) ) {
 252                         // Raw text from the database may have invalid chars
 253                         $text = strval( Revision::getRevisionText( $row ) );
 254                         $text = $content_handler->exportTransform( $text, $content_format );
 255                         $out .= "      " . Xml::elementClean( 'text',
 256                                 [ 'xml:space' => 'preserve', 'bytes' => intval( $row->rev_len ) ],
 257                                 strval( $text ) ) . "\n";
 258                 } else {
 259                         // Stub output
 260                         $out .= "      " . Xml::element( 'text',
 261                                 [ 'id' => $row->rev_text_id, 'bytes' => intval( $row->rev_len ) ],
 262                                 "" ) . "\n";
 263                 }
 264
 265                 if ( isset( $row->rev_sha1 )
 266                         && $row->rev_sha1
 267                         && !( $row->rev_deleted & Revision::DELETED_TEXT )
 268                 ) {
 269                         $out .= "      " . Xml::element( 'sha1', null, strval( $row->rev_sha1 ) ) . "\n";
 270                 } else {
 271                         $out .= "      <sha1/>\n";
 272                 }
 273
 274                 // Avoid PHP 7.1 warning from passing $this by reference
 275                 $writer = $this;
 276                 Hooks::run( 'XmlDumpWriterWriteRevision', [ &$writer, &$out, $row, $text ] );
 277
 278                 $out .= "    </revision>\n";
 279
 280                 return $out;
 281         }
 282
 283         /**
 284          * Dumps a "<logitem>" section on the output stream, with
 285          * data filled in from the given database row.
 286          *
 287          * @param object $row
 288          * @return string
 289          * @access private
 290          */
 291         function writeLogItem( $row ) {
 292                 $out = "  <logitem>\n";
 293                 $out .= "    " . Xml::element( 'id', null, strval( $row->log_id ) ) . "\n";
 294
 295                 $out .= $this->writeTimestamp( $row->log_timestamp, "    " );
 296
 297                 if ( $row->log_deleted & LogPage::DELETED_USER ) {
 298                         $out .= "    " . Xml::element( 'contributor', [ 'deleted' => 'deleted' ] ) . "\n";
 299                 } else {
 300                         $out .= $this->writeContributor( $row->log_user, $row->user_name, "    " );
 301                 }
 302
 303                 if ( $row->log_deleted & LogPage::DELETED_COMMENT ) {
 304                         $out .= "    " . Xml::element( 'comment', [ 'deleted' => 'deleted' ] ) . "\n";
 305                 } else {
 306                         $comment = CommentStore::newKey( 'log_comment' )->getComment( $row )->text;
 307                         if ( $comment != '' ) {
 308                                 $out .= "    " . Xml::elementClean( 'comment', null, strval( $comment ) ) . "\n";
 309                         }
 310                 }
 311
 312                 $out .= "    " . Xml::element( 'type', null, strval( $row->log_type ) ) . "\n";
 313                 $out .= "    " . Xml::element( 'action', null, strval( $row->log_action ) ) . "\n";
 314
 315                 if ( $row->log_deleted & LogPage::DELETED_ACTION ) {
 316                         $out .= "    " . Xml::element( 'text', [ 'deleted' => 'deleted' ] ) . "\n";
 317                 } else {
 318                         $title = Title::makeTitle( $row->log_namespace, $row->log_title );
 319                         $out .= "    " . Xml::elementClean( 'logtitle', null, self::canonicalTitle( $title ) ) . "\n";
 320                         $out .= "    " . Xml::elementClean( 'params',
 321                                 [ 'xml:space' => 'preserve' ],
 322                                 strval( $row->log_params ) ) . "\n";
 323                 }
 324
 325                 $out .= "  </logitem>\n";
 326
 327                 return $out;
 328         }
 329
 330         /**
 331          * @param string $timestamp
 332          * @param string $indent Default to six spaces
 333          * @return string
 334          */
 335         function writeTimestamp( $timestamp, $indent = "      " ) {
 336                 $ts = wfTimestamp( TS_ISO_8601, $timestamp );
 337                 return $indent . Xml::element( 'timestamp', null, $ts ) . "\n";
 338         }
 339
 340         /**
 341          * @param int $id
 342          * @param string $text
 343          * @param string $indent Default to six spaces
 344          * @return string
 345          */
 346         function writeContributor( $id, $text, $indent = "      " ) {
 347                 $out = $indent . "<contributor>\n";
 348                 if ( $id || !IP::isValid( $text ) ) {
 349                         $out .= $indent . "  " . Xml::elementClean( 'username', null, strval( $text ) ) . "\n";
 350                         $out .= $indent . "  " . Xml::element( 'id', null, strval( $id ) ) . "\n";
 351                 } else {
 352                         $out .= $indent . "  " . Xml::elementClean( 'ip', null, strval( $text ) ) . "\n";
 353                 }
 354                 $out .= $indent . "</contributor>\n";
 355                 return $out;
 356         }
 357
 358         /**
 359          * Warning! This data is potentially inconsistent. :(
 360          * @param object $row
 361          * @param bool $dumpContents
 362          * @return string
 363          */
 364         function writeUploads( $row, $dumpContents = false ) {
 365                 if ( $row->page_namespace == NS_FILE ) {
 366                         $img = wfLocalFile( $row->page_title );
 367                         if ( $img && $img->exists() ) {
 368                                 $out = '';
 369                                 foreach ( array_reverse( $img->getHistory() ) as $ver ) {
 370                                         $out .= $this->writeUpload( $ver, $dumpContents );
 371                                 }
 372                                 $out .= $this->writeUpload( $img, $dumpContents );
 373                                 return $out;
 374                         }
 375                 }
 376                 return '';
 377         }
 378
 379         /**
 380          * @param File $file
 381          * @param bool $dumpContents
 382          * @return string
 383          */
 384         function writeUpload( $file, $dumpContents = false ) {
 385                 if ( $file->isOld() ) {
 386                         $archiveName = "      " .
 387                                 Xml::element( 'archivename', null, $file->getArchiveName() ) . "\n";
 388                 } else {
 389                         $archiveName = '';
 390                 }
 391                 if ( $dumpContents ) {
 392                         $be = $file->getRepo()->getBackend();
 393                         # Dump file as base64
 394                         # Uses only XML-safe characters, so does not need escaping
 395                         # @todo Too bad this loads the contents into memory (script might swap)
 396                         $contents = '      <contents encoding="base64">' .
 397                                 chunk_split( base64_encode(
 398                                         $be->getFileContents( [ 'src' => $file->getPath() ] ) ) ) .
 399                                 "      </contents>\n";
 400                 } else {
 401                         $contents = '';
 402                 }
 403                 if ( $file->isDeleted( File::DELETED_COMMENT ) ) {
 404                         $comment = Xml::element( 'comment', [ 'deleted' => 'deleted' ] );
 405                 } else {
 406                         $comment = Xml::elementClean( 'comment', null, strval( $file->getDescription() ) );
 407                 }
 408                 return "    <upload>\n" .
 409                         $this->writeTimestamp( $file->getTimestamp() ) .
 410                         $this->writeContributor( $file->getUser( 'id' ), $file->getUser( 'text' ) ) .
 411                         "      " . $comment . "\n" .
 412                         "      " . Xml::element( 'filename', null, $file->getName() ) . "\n" .
 413                         $archiveName .
 414                         "      " . Xml::element( 'src', null, $file->getCanonicalUrl() ) . "\n" .
 415                         "      " . Xml::element( 'size', null, $file->getSize() ) . "\n" .
 416                         "      " . Xml::element( 'sha1base36', null, $file->getSha1() ) . "\n" .
 417                         "      " . Xml::element( 'rel', null, $file->getRel() ) . "\n" .
 418                         $contents .
 419                         "    </upload>\n";
 420         }
 421
 422         /**
 423          * Return prefixed text form of title, but using the content language's
 424          * canonical namespace. This skips any special-casing such as gendered
 425          * user namespaces -- which while useful, are not yet listed in the
 426          * XML "<siteinfo>" data so are unsafe in export.
 427          *
 428          * @param Title $title
 429          * @return string
 430          * @since 1.18
 431          */
 432         public static function canonicalTitle( Title $title ) {
 433                 if ( $title->isExternal() ) {
 434                         return $title->getPrefixedText();
 435                 }
 436
 437                 global $wgContLang;
 438                 $prefix = $wgContLang->getFormattedNsText( $title->getNamespace() );
 439
 440                 // @todo Emit some kind of warning to the user if $title->getNamespace() !==
 441                 // NS_MAIN and $prefix === '' (viz. pages in an unregistered namespace)
 442
 443                 if ( $prefix !== '' ) {
 444                         $prefix .= ':';
 445                 }
 446
 447                 return $prefix . $title->getText();
 448         }
 449 }