includes/WikiMap.php

   1 <?php
   2 /**
   3  * Tools for dealing with other locally-hosted wikis.
   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  */
  22
  23 /**
  24  * Helper tools for dealing with other wikis.
  25  */
  26 class WikiMap {
  27
  28         /**
  29          * Get a WikiReference object for $wikiID
  30          *
  31          * @param string $wikiID Wiki'd id (generally database name)
  32          * @return WikiReference|null WikiReference object or null if the wiki was not found
  33          */
  34         public static function getWiki( $wikiID ) {
  35                 $wikiReference = self::getWikiReferenceFromWgConf( $wikiID );
  36                 if ( $wikiReference ) {
  37                         return $wikiReference;
  38                 }
  39
  40                 // Try sites, if $wgConf failed
  41                 return self::getWikiWikiReferenceFromSites( $wikiID );
  42         }
  43
  44         /**
  45          * @param string $wikiID
  46          * @return WikiReference|null WikiReference object or null if the wiki was not found
  47          */
  48         private static function getWikiReferenceFromWgConf( $wikiID ) {
  49                 global $wgConf;
  50
  51                 $wgConf->loadFullData();
  52
  53                 list( $major, $minor ) = $wgConf->siteFromDB( $wikiID );
  54                 if ( $major === null ) {
  55                         return null;
  56                 }
  57                 $server = $wgConf->get( 'wgServer', $wikiID, $major,
  58                         [ 'lang' => $minor, 'site' => $major ] );
  59
  60                 $canonicalServer = $wgConf->get( 'wgCanonicalServer', $wikiID, $major,
  61                         [ 'lang' => $minor, 'site' => $major ] );
  62                 if ( $canonicalServer === false || $canonicalServer === null ) {
  63                         $canonicalServer = $server;
  64                 }
  65
  66                 $path = $wgConf->get( 'wgArticlePath', $wikiID, $major,
  67                         [ 'lang' => $minor, 'site' => $major ] );
  68
  69                 // If we don't have a canonical server or a path containing $1, the
  70                 // WikiReference isn't going to function properly. Just return null in
  71                 // that case.
  72                 if ( !is_string( $canonicalServer ) || !is_string( $path ) || strpos( $path, '$1' ) === false ) {
  73                         return null;
  74                 }
  75
  76                 return new WikiReference( $canonicalServer, $path, $server );
  77         }
  78
  79         /**
  80          * @param string $wikiID
  81          * @return WikiReference|null WikiReference object or null if the wiki was not found
  82          */
  83         private static function getWikiWikiReferenceFromSites( $wikiID ) {
  84                 $siteLookup = \MediaWiki\MediaWikiServices::getInstance()->getSiteLookup();
  85                 $site = $siteLookup->getSite( $wikiID );
  86
  87                 if ( !$site instanceof MediaWikiSite ) {
  88                         // Abort if not a MediaWikiSite, as this is about Wikis
  89                         return null;
  90                 }
  91
  92                 $urlParts = wfParseUrl( $site->getPageUrl() );
  93                 if ( $urlParts === false || !isset( $urlParts['path'] ) || !isset( $urlParts['host'] ) ) {
  94                         // We can't create a meaningful WikiReference without URLs
  95                         return null;
  96                 }
  97
  98                 // XXX: Check whether path contains a $1?
  99                 $path = $urlParts['path'];
 100                 if ( isset( $urlParts['query'] ) ) {
 101                         $path .= '?' . $urlParts['query'];
 102                 }
 103
 104                 $canonicalServer = isset( $urlParts['scheme'] ) ? $urlParts['scheme'] : 'http';
 105                 $canonicalServer .= '://' . $urlParts['host'];
 106
 107                 return new WikiReference( $canonicalServer, $path );
 108         }
 109
 110         /**
 111          * Convenience to get the wiki's display name
 112          *
 113          * @todo We can give more info than just the wiki id!
 114          * @param string $wikiID Wiki'd id (generally database name)
 115          * @return string|int Wiki's name or $wiki_id if the wiki was not found
 116          */
 117         public static function getWikiName( $wikiID ) {
 118                 $wiki = WikiMap::getWiki( $wikiID );
 119
 120                 if ( $wiki ) {
 121                         return $wiki->getDisplayName();
 122                 }
 123                 return $wikiID;
 124         }
 125
 126         /**
 127          * Convenience to get a link to a user page on a foreign wiki
 128          *
 129          * @param string $wikiID Wiki'd id (generally database name)
 130          * @param string $user User name (must be normalised before calling this function!)
 131          * @param string $text Link's text; optional, default to "User:$user"
 132          * @return string HTML link or false if the wiki was not found
 133          */
 134         public static function foreignUserLink( $wikiID, $user, $text = null ) {
 135                 return self::makeForeignLink( $wikiID, "User:$user", $text );
 136         }
 137
 138         /**
 139          * Convenience to get a link to a page on a foreign wiki
 140          *
 141          * @param string $wikiID Wiki'd id (generally database name)
 142          * @param string $page Page name (must be normalised before calling this function!)
 143          * @param string $text Link's text; optional, default to $page
 144          * @return string|false HTML link or false if the wiki was not found
 145          */
 146         public static function makeForeignLink( $wikiID, $page, $text = null ) {
 147                 if ( !$text ) {
 148                         $text = $page;
 149                 }
 150
 151                 $url = self::getForeignURL( $wikiID, $page );
 152                 if ( $url === false ) {
 153                         return false;
 154                 }
 155
 156                 return Linker::makeExternalLink( $url, $text );
 157         }
 158
 159         /**
 160          * Convenience to get a url to a page on a foreign wiki
 161          *
 162          * @param string $wikiID Wiki'd id (generally database name)
 163          * @param string $page Page name (must be normalised before calling this function!)
 164          * @param string|null $fragmentId
 165          *
 166          * @return string|bool URL or false if the wiki was not found
 167          */
 168         public static function getForeignURL( $wikiID, $page, $fragmentId = null ) {
 169                 $wiki = WikiMap::getWiki( $wikiID );
 170
 171                 if ( $wiki ) {
 172                         return $wiki->getFullUrl( $page, $fragmentId );
 173                 }
 174
 175                 return false;
 176         }
 177 }
 178
 179 /**
 180  * Reference to a locally-hosted wiki
 181  */
 182 class WikiReference {
 183         private $mCanonicalServer; ///< canonical server URL, e.g. 'https://www.mediawiki.org'
 184         private $mServer; ///< server URL, may be protocol-relative, e.g. '//www.mediawiki.org'
 185         private $mPath;   ///< path, '/wiki/$1'
 186
 187         /**
 188          * @param string $canonicalServer
 189          * @param string $path
 190          * @param null|string $server
 191          */
 192         public function __construct( $canonicalServer, $path, $server = null ) {
 193                 $this->mCanonicalServer = $canonicalServer;
 194                 $this->mPath = $path;
 195                 $this->mServer = $server === null ? $canonicalServer : $server;
 196         }
 197
 198         /**
 199          * Get the URL in a way to be displayed to the user
 200          * More or less Wikimedia specific
 201          *
 202          * @return string
 203          */
 204         public function getDisplayName() {
 205                 $parsed = wfParseUrl( $this->mCanonicalServer );
 206                 if ( $parsed ) {
 207                         return $parsed['host'];
 208                 } else {
 209                         // Invalid server spec.
 210                         // There's no sane thing to do here, so just return the canonical server name in full.
 211                         return $this->mCanonicalServer;
 212                 }
 213         }
 214
 215         /**
 216          * Helper function for getUrl()
 217          *
 218          * @todo FIXME: This may be generalized...
 219          *
 220          * @param string $page Page name (must be normalised before calling this function!
 221          *  May contain a section part.)
 222          * @param string|null $fragmentId
 223          *
 224          * @return string relative URL, without the server part.
 225          */
 226         private function getLocalUrl( $page, $fragmentId = null ) {
 227                 $page = wfUrlencode( str_replace( ' ', '_', $page ) );
 228
 229                 if ( is_string( $fragmentId ) && $fragmentId !== '' ) {
 230                         $page .= '#' . wfUrlencode( $fragmentId );
 231                 }
 232
 233                 return str_replace( '$1', $page, $this->mPath );
 234         }
 235
 236         /**
 237          * Get a canonical (i.e. based on $wgCanonicalServer) URL to a page on this foreign wiki
 238          *
 239          * @param string $page Page name (must be normalised before calling this function!)
 240          * @param string|null $fragmentId
 241          *
 242          * @return string Url
 243          */
 244         public function getCanonicalUrl( $page, $fragmentId = null ) {
 245                 return $this->mCanonicalServer . $this->getLocalUrl( $page, $fragmentId );
 246         }
 247
 248         /**
 249          * Get a canonical server URL
 250          * @return string
 251          */
 252         public function getCanonicalServer() {
 253                 return $this->mCanonicalServer;
 254         }
 255
 256         /**
 257          * Alias for getCanonicalUrl(), for backwards compatibility.
 258          * @param string $page
 259          * @param string|null $fragmentId
 260          *
 261          * @return string
 262          */
 263         public function getUrl( $page, $fragmentId = null ) {
 264                 return $this->getCanonicalUrl( $page, $fragmentId );
 265         }
 266
 267         /**
 268          * Get a URL based on $wgServer, like Title::getFullURL() would produce
 269          * when called locally on the wiki.
 270          *
 271          * @param string $page Page name (must be normalized before calling this function!)
 272          * @param string|null $fragmentId
 273          *
 274          * @return string URL
 275          */
 276         public function getFullUrl( $page, $fragmentId = null ) {
 277                 return $this->mServer .
 278                         $this->getLocalUrl( $page, $fragmentId );
 279         }
 280 }