includes/changes/CategoryMembershipChange.php

   1 <?php
   2 /**
   3  * Helper class for category membership changes
   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  * @author Kai Nissen
  22  * @author Addshore
  23  * @since 1.27
  24  */
  25
  26 use Wikimedia\Assert\Assert;
  27
  28 class CategoryMembershipChange {
  29
  30         const CATEGORY_ADDITION = 1;
  31         const CATEGORY_REMOVAL = -1;
  32
  33         /**
  34          * @var string Current timestamp, set during CategoryMembershipChange::__construct()
  35          */
  36         private $timestamp;
  37
  38         /**
  39          * @var Title Title instance of the categorized page
  40          */
  41         private $pageTitle;
  42
  43         /**
  44          * @var Revision|null Latest Revision instance of the categorized page
  45          */
  46         private $revision;
  47
  48         /**
  49          * @var int
  50          * Number of pages this WikiPage is embedded by
  51          * Set by CategoryMembershipChange::checkTemplateLinks()
  52          */
  53         private $numTemplateLinks = 0;
  54
  55         /**
  56          * @var callable|null
  57          */
  58         private $newForCategorizationCallback = null;
  59
  60         /**
  61          * @param Title $pageTitle Title instance of the categorized page
  62          * @param Revision $revision Latest Revision instance of the categorized page
  63          *
  64          * @throws MWException
  65          */
  66         public function __construct( Title $pageTitle, Revision $revision = null ) {
  67                 $this->pageTitle = $pageTitle;
  68                 if ( $revision === null ) {
  69                         $this->timestamp = wfTimestampNow();
  70                 } else {
  71                         $this->timestamp = $revision->getTimestamp();
  72                 }
  73                 $this->revision = $revision;
  74                 $this->newForCategorizationCallback = [ 'RecentChange', 'newForCategorization' ];
  75         }
  76
  77         /**
  78          * Overrides the default new for categorization callback
  79          * This is intended for use while testing and will fail if MW_PHPUNIT_TEST is not defined.
  80          *
  81          * @param callable $callback
  82          * @see RecentChange::newForCategorization for callback signiture
  83          *
  84          * @throws MWException
  85          */
  86         public function overrideNewForCategorizationCallback( $callback ) {
  87                 if ( !defined( 'MW_PHPUNIT_TEST' ) ) {
  88                         throw new MWException( 'Cannot override newForCategorization callback in operation.' );
  89                 }
  90                 Assert::parameterType( 'callable', $callback, '$callback' );
  91                 $this->newForCategorizationCallback = $callback;
  92         }
  93
  94         /**
  95          * Determines the number of template links for recursive link updates
  96          */
  97         public function checkTemplateLinks() {
  98                 $this->numTemplateLinks = $this->pageTitle->getBacklinkCache()->getNumLinks( 'templatelinks' );
  99         }
 100
 101         /**
 102          * Create a recentchanges entry for category additions
 103          *
 104          * @param Title $categoryTitle
 105          */
 106         public function triggerCategoryAddedNotification( Title $categoryTitle ) {
 107                 $this->createRecentChangesEntry( $categoryTitle, self::CATEGORY_ADDITION );
 108         }
 109
 110         /**
 111          * Create a recentchanges entry for category removals
 112          *
 113          * @param Title $categoryTitle
 114          */
 115         public function triggerCategoryRemovedNotification( Title $categoryTitle ) {
 116                 $this->createRecentChangesEntry( $categoryTitle, self::CATEGORY_REMOVAL );
 117         }
 118
 119         /**
 120          * Create a recentchanges entry using RecentChange::notifyCategorization()
 121          *
 122          * @param Title $categoryTitle
 123          * @param int $type
 124          */
 125         private function createRecentChangesEntry( Title $categoryTitle, $type ) {
 126                 $this->notifyCategorization(
 127                         $this->timestamp,
 128                         $categoryTitle,
 129                         $this->getUser(),
 130                         $this->getChangeMessageText(
 131                                 $type,
 132                                 [ 'prefixedText' => $this->pageTitle->getPrefixedText() ],
 133                                 $this->numTemplateLinks
 134                         ),
 135                         $this->pageTitle,
 136                         $this->getPreviousRevisionTimestamp(),
 137                         $this->revision
 138                 );
 139         }
 140
 141         /**
 142          * @param string $timestamp Timestamp of the recent change to occur in TS_MW format
 143          * @param Title $categoryTitle Title of the category a page is being added to or removed from
 144          * @param User $user User object of the user that made the change
 145          * @param string $comment Change summary
 146          * @param Title $pageTitle Title of the page that is being added or removed
 147          * @param string $lastTimestamp Parent revision timestamp of this change in TS_MW format
 148          * @param Revision|null $revision
 149          *
 150          * @throws MWException
 151          */
 152         private function notifyCategorization(
 153                 $timestamp,
 154                 Title $categoryTitle,
 155                 User $user = null,
 156                 $comment,
 157                 Title $pageTitle,
 158                 $lastTimestamp,
 159                 $revision
 160         ) {
 161                 $deleted = $revision ? $revision->getVisibility() & Revision::SUPPRESSED_USER : 0;
 162                 $newRevId = $revision ? $revision->getId() : 0;
 163
 164                 /**
 165                  * T109700 - Default bot flag to true when there is no corresponding RC entry
 166                  * This means all changes caused by parser functions & Lua on reparse are marked as bot
 167                  * Also in the case no RC entry could be found due to replica DB lag
 168                  */
 169                 $bot = 1;
 170                 $lastRevId = 0;
 171                 $ip = '';
 172
 173                 # If no revision is given, the change was probably triggered by parser functions
 174                 if ( $revision !== null ) {
 175                         $correspondingRc = $this->revision->getRecentChange();
 176                         if ( $correspondingRc === null ) {
 177                                 $correspondingRc = $this->revision->getRecentChange( Revision::READ_LATEST );
 178                         }
 179                         if ( $correspondingRc !== null ) {
 180                                 $bot = $correspondingRc->getAttribute( 'rc_bot' ) ?: 0;
 181                                 $ip = $correspondingRc->getAttribute( 'rc_ip' ) ?: '';
 182                                 $lastRevId = $correspondingRc->getAttribute( 'rc_last_oldid' ) ?: 0;
 183                         }
 184                 }
 185
 186                 /** @var RecentChange $rc */
 187                 $rc = call_user_func_array(
 188                         $this->newForCategorizationCallback,
 189                         [
 190                                 $timestamp,
 191                                 $categoryTitle,
 192                                 $user,
 193                                 $comment,
 194                                 $pageTitle,
 195                                 $lastRevId,
 196                                 $newRevId,
 197                                 $lastTimestamp,
 198                                 $bot,
 199                                 $ip,
 200                                 $deleted
 201                         ]
 202                 );
 203                 $rc->save();
 204         }
 205
 206         /**
 207          * Get the user associated with this change.
 208          *
 209          * If there is no revision associated with the change and thus no editing user
 210          * fallback to a default.
 211          *
 212          * False will be returned if the user name specified in the
 213          * 'autochange-username' message is invalid.
 214          *
 215          * @return User|bool
 216          */
 217         private function getUser() {
 218                 if ( $this->revision ) {
 219                         $userId = $this->revision->getUser( Revision::RAW );
 220                         if ( $userId === 0 ) {
 221                                 return User::newFromName( $this->revision->getUserText( Revision::RAW ), false );
 222                         } else {
 223                                 return User::newFromId( $userId );
 224                         }
 225                 }
 226
 227                 $username = wfMessage( 'autochange-username' )->inContentLanguage()->text();
 228                 $user = User::newFromName( $username );
 229                 # User::newFromName() can return false on a badly configured wiki.
 230                 if ( $user && !$user->isLoggedIn() ) {
 231                         $user->addToDatabase();
 232                 }
 233
 234                 return $user;
 235         }
 236
 237         /**
 238          * Returns the change message according to the type of category membership change
 239          *
 240          * The message keys created in this method may be one of:
 241          * - recentchanges-page-added-to-category
 242          * - recentchanges-page-added-to-category-bundled
 243          * - recentchanges-page-removed-from-category
 244          * - recentchanges-page-removed-from-category-bundled
 245          *
 246          * @param int $type may be CategoryMembershipChange::CATEGORY_ADDITION
 247          * or CategoryMembershipChange::CATEGORY_REMOVAL
 248          * @param array $params
 249          * - prefixedText: result of Title::->getPrefixedText()
 250          * @param int $numTemplateLinks
 251          *
 252          * @return string
 253          */
 254         private function getChangeMessageText( $type, array $params, $numTemplateLinks ) {
 255                 $array = [
 256                         self::CATEGORY_ADDITION => 'recentchanges-page-added-to-category',
 257                         self::CATEGORY_REMOVAL => 'recentchanges-page-removed-from-category',
 258                 ];
 259
 260                 $msgKey = $array[$type];
 261
 262                 if ( intval( $numTemplateLinks ) > 0 ) {
 263                         $msgKey .= '-bundled';
 264                 }
 265
 266                 return wfMessage( $msgKey, $params )->inContentLanguage()->text();
 267         }
 268
 269         /**
 270          * Returns the timestamp of the page's previous revision or null if the latest revision
 271          * does not refer to a parent revision
 272          *
 273          * @return null|string
 274          */
 275         private function getPreviousRevisionTimestamp() {
 276                 $previousRev = Revision::newFromId(
 277                                 $this->pageTitle->getPreviousRevisionID( $this->pageTitle->getLatestRevID() )
 278                         );
 279
 280                 return $previousRev ? $previousRev->getTimestamp() : null;
 281         }
 282
 283 }