includes/user/ExternalUserNames.php

   1 <?php
   2 /**
   3  * Class to parse and build external user names
   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 use MediaWiki\MediaWikiServices;
  24
  25 /**
  26  * Class to parse and build external user names
  27  * @since 1.31
  28  */
  29 class ExternalUserNames {
  30
  31         /**
  32          * @var string
  33          */
  34         private $usernamePrefix = 'imported';
  35
  36         /**
  37          * @var bool
  38          */
  39         private $assignKnownUsers = false;
  40
  41         /**
  42          * @var bool[]
  43          */
  44         private $triedCreations = [];
  45
  46         /**
  47          * @param string $usernamePrefix Prefix to apply to unknown (and possibly also known) usernames
  48          * @param bool $assignKnownUsers Whether to apply the prefix to usernames that exist locally
  49          */
  50         public function __construct( $usernamePrefix, $assignKnownUsers ) {
  51                 $this->usernamePrefix = rtrim( (string)$usernamePrefix, ':>' );
  52                 $this->assignKnownUsers = (bool)$assignKnownUsers;
  53         }
  54
  55         /**
  56          * Get a target Title to link a username.
  57          *
  58          * @param string $userName Username to link
  59          *
  60          * @return null|Title
  61          */
  62         public static function getUserLinkTitle( $userName ) {
  63                 $pos = strpos( $userName, '>' );
  64                 if ( $pos !== false ) {
  65                         $iw = explode( ':', substr( $userName, 0, $pos ) );
  66                         $firstIw = array_shift( $iw );
  67                         $interwikiLookup = MediaWikiServices::getInstance()->getInterwikiLookup();
  68                         if ( $interwikiLookup->isValidInterwiki( $firstIw ) ) {
  69                                 $title = MWNamespace::getCanonicalName( NS_USER ) . ':' . substr( $userName, $pos + 1 );
  70                                 if ( $iw ) {
  71                                         $title = implode( ':', $iw ) . ':' . $title;
  72                                 }
  73                                 return Title::makeTitle( NS_MAIN, $title, '', $firstIw );
  74                         }
  75                         return null;
  76                 } else {
  77                         return SpecialPage::getTitleFor( 'Contributions', $userName );
  78                 }
  79         }
  80
  81         /**
  82          * Add an interwiki prefix to the username, if appropriate
  83          *
  84          * This method does have a side-effect on SUL (single user login) wikis: Calling this calls the
  85          * ImportHandleUnknownUser hook from the CentralAuth extension, which assigns a local ID to the
  86          * global user name, if possible. No prefix is applied if this is successful.
  87          *
  88          * @see https://meta.wikimedia.org/wiki/Help:Unified_login
  89          * @see https://www.mediawiki.org/wiki/Manual:Hooks/ImportHandleUnknownUser
  90          *
  91          * @param string $name
  92          * @return string Either the unchanged username if it's a known local user (or not a valid
  93          *  username), otherwise the name with the prefix prepended.
  94          */
  95         public function applyPrefix( $name ) {
  96                 if ( !User::isUsableName( $name ) ) {
  97                         return $name;
  98                 }
  99
 100                 if ( $this->assignKnownUsers ) {
 101                         if ( User::idFromName( $name ) ) {
 102                                 return $name;
 103                         }
 104
 105                         // See if any extension wants to create it.
 106                         if ( !isset( $this->triedCreations[$name] ) ) {
 107                                 $this->triedCreations[$name] = true;
 108                                 if ( !Hooks::run( 'ImportHandleUnknownUser', [ $name ] ) &&
 109                                         User::idFromName( $name, User::READ_LATEST )
 110                                 ) {
 111                                         return $name;
 112                                 }
 113                         }
 114                 }
 115
 116                 return $this->addPrefix( $name );
 117         }
 118
 119         /**
 120          * Add an interwiki prefix to the username regardless of circumstances
 121          *
 122          * @param string $name
 123          * @return string Prefixed username, using ">" as separator
 124          */
 125         public function addPrefix( $name ) {
 126                 return substr( $this->usernamePrefix . '>' . $name, 0, 255 );
 127         }
 128
 129         /**
 130          * Tells whether the username is external or not
 131          *
 132          * @param string $username Username to check
 133          * @return bool true if it's external, false otherwise.
 134          */
 135         public static function isExternal( $username ) {
 136                 return strpos( $username, '>' ) !== false;
 137         }
 138
 139         /**
 140          * Get local part of the user name
 141          *
 142          * @param string $username Username to get
 143          * @return string
 144          */
 145         public static function getLocal( $username ) {
 146                 if ( !self::isExternal( $username ) ) {
 147                         return $username;
 148                 }
 149
 150                 return substr( $username, strpos( $username, '>' ) + 1 );
 151         }
 152
 153 }