includes/site/MediaWikiSite.php

   1 <?php
   2 /**
   3  * Class representing a MediaWiki site.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Site
  22  * @license GNU GPL v2+
  23  * @author John Erling Blad < jeblad@gmail.com >
  24  * @author Daniel Kinzler
  25  * @author Jeroen De Dauw < jeroendedauw@gmail.com >
  26  */
  27
  28 /**
  29  * Class representing a MediaWiki site.
  30  *
  31  * @since 1.21
  32  *
  33  * @ingroup Site
  34  */
  35 class MediaWikiSite extends Site {
  36         const PATH_FILE = 'file_path';
  37         const PATH_PAGE = 'page_path';
  38
  39         /**
  40          * @since 1.21
  41          * @deprecated since 1.21 Just use the constructor or the factory Site::newForType
  42          *
  43          * @param int $globalId
  44          *
  45          * @return MediaWikiSite
  46          */
  47         public static function newFromGlobalId( $globalId ) {
  48                 $site = new static();
  49                 $site->setGlobalId( $globalId );
  50                 return $site;
  51         }
  52
  53         /**
  54          * Constructor.
  55          *
  56          * @since 1.21
  57          *
  58          * @param string $type
  59          */
  60         public function __construct( $type = self::TYPE_MEDIAWIKI ) {
  61                 parent::__construct( $type );
  62         }
  63
  64         /**
  65          * Returns the database form of the given title.
  66          *
  67          * @since 1.21
  68          *
  69          * @param string $title The target page's title, in normalized form.
  70          *
  71          * @return string
  72          */
  73         public function toDBKey( $title ) {
  74                 return str_replace( ' ', '_', $title );
  75         }
  76
  77         /**
  78          * Returns the normalized form of the given page title, using the
  79          * normalization rules of the given site. If the given title is a redirect,
  80          * the redirect weill be resolved and the redirect target is returned.
  81          *
  82          * @note This actually makes an API request to the remote site, so beware
  83          *   that this function is slow and depends on an external service.
  84          *
  85          * @note If MW_PHPUNIT_TEST is defined, the call to the external site is
  86          *   skipped, and the title is normalized using the local normalization
  87          *   rules as implemented by the Title class.
  88          *
  89          * @see Site::normalizePageName
  90          *
  91          * @since 1.21
  92          *
  93          * @param string $pageName
  94          *
  95          * @return string
  96          * @throws MWException
  97          */
  98         public function normalizePageName( $pageName ) {
  99
 100                 // Check if we have strings as arguments.
 101                 if ( !is_string( $pageName ) ) {
 102                         throw new MWException( '$pageName must be a string' );
 103                 }
 104
 105                 // Go on call the external site
 106                 if ( defined( 'MW_PHPUNIT_TEST' ) ) {
 107                         // If the code is under test, don't call out to other sites, just
 108                         // normalize locally.
 109                         // Note: this may cause results to be inconsistent with the actual
 110                         // normalization used by the respective remote site!
 111
 112                         $t = Title::newFromText( $pageName );
 113                         return $t->getPrefixedText();
 114                 } else {
 115
 116                         // Make sure the string is normalized into NFC (due to T42017)
 117                         // but do nothing to the whitespaces, that should work appropriately.
 118                         // @see https://phabricator.wikimedia.org/T42017
 119                         $pageName = UtfNormal\Validator::cleanUp( $pageName );
 120
 121                         // Build the args for the specific call
 122                         $args = array(
 123                                 'action' => 'query',
 124                                 'prop' => 'info',
 125                                 'redirects' => true,
 126                                 'converttitles' => true,
 127                                 'format' => 'json',
 128                                 'titles' => $pageName,
 129                                 // @todo options for maxlag and maxage
 130                                 // Note that maxlag will lead to a long delay before a reply is made,
 131                                 // but that maxage can avoid the extreme delay. On the other hand
 132                                 // maxage could be nice to use anyhow as it stops unnecessary requests.
 133                                 // Also consider smaxage if maxage is used.
 134                         );
 135
 136                         $url = wfAppendQuery( $this->getFileUrl( 'api.php' ), $args );
 137
 138                         // Go on call the external site
 139                         // @todo we need a good way to specify a timeout here.
 140                         $ret = Http::get( $url, array(), __METHOD__ );
 141                 }
 142
 143                 if ( $ret === false ) {
 144                         wfDebugLog( "MediaWikiSite", "call to external site failed: $url" );
 145                         return false;
 146                 }
 147
 148                 $data = FormatJson::decode( $ret, true );
 149
 150                 if ( !is_array( $data ) ) {
 151                         wfDebugLog( "MediaWikiSite", "call to <$url> returned bad json: " . $ret );
 152                         return false;
 153                 }
 154
 155                 $page = static::extractPageRecord( $data, $pageName );
 156
 157                 if ( isset( $page['missing'] ) ) {
 158                         wfDebugLog( "MediaWikiSite", "call to <$url> returned a marker for a missing page title! "
 159                                 . $ret );
 160                         return false;
 161                 }
 162
 163                 if ( isset( $page['invalid'] ) ) {
 164                         wfDebugLog( "MediaWikiSite", "call to <$url> returned a marker for an invalid page title! "
 165                                 . $ret );
 166                         return false;
 167                 }
 168
 169                 if ( !isset( $page['title'] ) ) {
 170                         wfDebugLog( "MediaWikiSite", "call to <$url> did not return a page title! " . $ret );
 171                         return false;
 172                 }
 173
 174                 return $page['title'];
 175         }
 176
 177         /**
 178          * Get normalization record for a given page title from an API response.
 179          *
 180          * @since 1.21
 181          *
 182          * @param array $externalData A reply from the API on a external server.
 183          * @param string $pageTitle Identifies the page at the external site, needing normalization.
 184          *
 185          * @return array|bool A 'page' structure representing the page identified by $pageTitle.
 186          */
 187         private static function extractPageRecord( $externalData, $pageTitle ) {
 188                 // If there is a special case with only one returned page
 189                 // we can cheat, and only return
 190                 // the single page in the "pages" substructure.
 191                 if ( isset( $externalData['query']['pages'] ) ) {
 192                         $pages = array_values( $externalData['query']['pages'] );
 193                         if ( count( $pages ) === 1 ) {
 194                                 return $pages[0];
 195                         }
 196                 }
 197                 // This is only used during internal testing, as it is assumed
 198                 // a more optimal (and lossfree) storage.
 199                 // Make initial checks and return if prerequisites are not meet.
 200                 if ( !is_array( $externalData ) || !isset( $externalData['query'] ) ) {
 201                         return false;
 202                 }
 203                 // Loop over the tree different named structures, that otherwise are similar
 204                 $structs = array(
 205                         'normalized' => 'from',
 206                         'converted' => 'from',
 207                         'redirects' => 'from',
 208                         'pages' => 'title'
 209                 );
 210                 foreach ( $structs as $listId => $fieldId ) {
 211                         // Check if the substructure exist at all.
 212                         if ( !isset( $externalData['query'][$listId] ) ) {
 213                                 continue;
 214                         }
 215                         // Filter the substructure down to what we actually are using.
 216                         $collectedHits = array_filter(
 217                                 array_values( $externalData['query'][$listId] ),
 218                                 function ( $a ) use ( $fieldId, $pageTitle ) {
 219                                         return $a[$fieldId] === $pageTitle;
 220                                 }
 221                         );
 222                         // If still looping over normalization, conversion or redirects,
 223                         // then we need to keep the new page title for later rounds.
 224                         if ( $fieldId === 'from' && is_array( $collectedHits ) ) {
 225                                 switch ( count( $collectedHits ) ) {
 226                                         case 0:
 227                                                 break;
 228                                         case 1:
 229                                                 $pageTitle = $collectedHits[0]['to'];
 230                                                 break;
 231                                         default:
 232                                                 return false;
 233                                 }
 234                         }
 235                         // If on the pages structure we should prepare for returning.
 236                         elseif ( $fieldId === 'title' && is_array( $collectedHits ) ) {
 237                                 switch ( count( $collectedHits ) ) {
 238                                         case 0:
 239                                                 return false;
 240                                         case 1:
 241                                                 return array_shift( $collectedHits );
 242                                         default:
 243                                                 return false;
 244                                 }
 245                         }
 246                 }
 247                 // should never be here
 248                 return false;
 249         }
 250
 251         /**
 252          * @see Site::getLinkPathType
 253          * Returns Site::PATH_PAGE
 254          *
 255          * @since 1.21
 256          *
 257          * @return string
 258          */
 259         public function getLinkPathType() {
 260                 return self::PATH_PAGE;
 261         }
 262
 263         /**
 264          * Returns the relative page path.
 265          *
 266          * @since 1.21
 267          *
 268          * @return string
 269          */
 270         public function getRelativePagePath() {
 271                 return parse_url( $this->getPath( self::PATH_PAGE ), PHP_URL_PATH );
 272         }
 273
 274         /**
 275          * Returns the relative file path.
 276          *
 277          * @since 1.21
 278          *
 279          * @return string
 280          */
 281         public function getRelativeFilePath() {
 282                 return parse_url( $this->getPath( self::PATH_FILE ), PHP_URL_PATH );
 283         }
 284
 285         /**
 286          * Sets the relative page path.
 287          *
 288          * @since 1.21
 289          *
 290          * @param string $path
 291          */
 292         public function setPagePath( $path ) {
 293                 $this->setPath( self::PATH_PAGE, $path );
 294         }
 295
 296         /**
 297          * Sets the relative file path.
 298          *
 299          * @since 1.21
 300          *
 301          * @param string $path
 302          */
 303         public function setFilePath( $path ) {
 304                 $this->setPath( self::PATH_FILE, $path );
 305         }
 306
 307         /**
 308          * @see Site::getPageUrl
 309          *
 310          * This implementation returns a URL constructed using the path returned by getLinkPath().
 311          * In addition to the default behavior implemented by Site::getPageUrl(), this
 312          * method converts the $pageName to DBKey-format by replacing spaces with underscores
 313          * before using it in the URL.
 314          *
 315          * @since 1.21
 316          *
 317          * @param string|bool $pageName Page name or false (default: false)
 318          *
 319          * @return string
 320          */
 321         public function getPageUrl( $pageName = false ) {
 322                 $url = $this->getLinkPath();
 323
 324                 if ( $url === false ) {
 325                         return false;
 326                 }
 327
 328                 if ( $pageName !== false ) {
 329                         $pageName = $this->toDBKey( trim( $pageName ) );
 330                         $url = str_replace( '$1', wfUrlencode( $pageName ), $url );
 331                 }
 332
 333                 return $url;
 334         }
 335
 336         /**
 337          * Returns the full file path (ie site url + relative file path).
 338          * The path should go at the $1 marker. If the $path
 339          * argument is provided, the marker will be replaced by it's value.
 340          *
 341          * @since 1.21
 342          *
 343          * @param string|bool $path
 344          *
 345          * @return string
 346          */
 347         public function getFileUrl( $path = false ) {
 348                 $filePath = $this->getPath( self::PATH_FILE );
 349
 350                 if ( $filePath !== false ) {
 351                         $filePath = str_replace( '$1', $path, $filePath );
 352                 }
 353
 354                 return $filePath;
 355         }
 356 }