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                                 $this->pageTitle->getPrefixedText(),
 133                                 $this->numTemplateLinks
 134                         ),
 135                         $this->pageTitle,
 136                         $this->getPreviousRevisionTimestamp(),
 137                         $this->revision,
 138                         $type === self::CATEGORY_ADDITION
 139                 );
 140         }
 141
 142         /**
 143          * @param string $timestamp Timestamp of the recent change to occur in TS_MW format
 144          * @param Title $categoryTitle Title of the category a page is being added to or removed from
 145          * @param User $user User object of the user that made the change
 146          * @param string $comment Change summary
 147          * @param Title $pageTitle Title of the page that is being added or removed
 148          * @param string $lastTimestamp Parent revision timestamp of this change in TS_MW format
 149          * @param Revision|null $revision
 150          * @param bool $added true, if the category was added, false for removed
 151          *
 152          * @throws MWException
 153          */
 154         private function notifyCategorization(
 155                 $timestamp,
 156                 Title $categoryTitle,
 157                 User $user = null,
 158                 $comment,
 159                 Title $pageTitle,
 160                 $lastTimestamp,
 161                 $revision,
 162                 $added
 163         ) {
 164                 $deleted = $revision ? $revision->getVisibility() & Revision::SUPPRESSED_USER : 0;
 165                 $newRevId = $revision ? $revision->getId() : 0;
 166
 167                 /**
 168                  * T109700 - Default bot flag to true when there is no corresponding RC entry
 169                  * This means all changes caused by parser functions & Lua on reparse are marked as bot
 170                  * Also in the case no RC entry could be found due to replica DB lag
 171                  */
 172                 $bot = 1;
 173                 $lastRevId = 0;
 174                 $ip = '';
 175
 176                 # If no revision is given, the change was probably triggered by parser functions
 177                 if ( $revision !== null ) {
 178                         $correspondingRc = $this->revision->getRecentChange();
 179                         if ( $correspondingRc === null ) {
 180                                 $correspondingRc = $this->revision->getRecentChange( Revision::READ_LATEST );
 181                         }
 182                         if ( $correspondingRc !== null ) {
 183                                 $bot = $correspondingRc->getAttribute( 'rc_bot' ) ?: 0;
 184                                 $ip = $correspondingRc->getAttribute( 'rc_ip' ) ?: '';
 185                                 $lastRevId = $correspondingRc->getAttribute( 'rc_last_oldid' ) ?: 0;
 186                         }
 187                 }
 188
 189                 /** @var RecentChange $rc */
 190                 $rc = call_user_func_array(
 191                         $this->newForCategorizationCallback,
 192                         [
 193                                 $timestamp,
 194                                 $categoryTitle,
 195                                 $user,
 196                                 $comment,
 197                                 $pageTitle,
 198                                 $lastRevId,
 199                                 $newRevId,
 200                                 $lastTimestamp,
 201                                 $bot,
 202                                 $ip,
 203                                 $deleted,
 204                                 $added
 205                         ]
 206                 );
 207                 $rc->save();
 208         }
 209
 210         /**
 211          * Get the user associated with this change.
 212          *
 213          * If there is no revision associated with the change and thus no editing user
 214          * fallback to a default.
 215          *
 216          * False will be returned if the user name specified in the
 217          * 'autochange-username' message is invalid.
 218          *
 219          * @return User|bool
 220          */
 221         private function getUser() {
 222                 if ( $this->revision ) {
 223                         $userId = $this->revision->getUser( Revision::RAW );
 224                         if ( $userId === 0 ) {
 225                                 return User::newFromName( $this->revision->getUserText( Revision::RAW ), false );
 226                         } else {
 227                                 return User::newFromId( $userId );
 228                         }
 229                 }
 230
 231                 $username = wfMessage( 'autochange-username' )->inContentLanguage()->text();
 232                 $user = User::newFromName( $username );
 233                 # User::newFromName() can return false on a badly configured wiki.
 234                 if ( $user && !$user->isLoggedIn() ) {
 235                         $user->addToDatabase();
 236                 }
 237
 238                 return $user;
 239         }
 240
 241         /**
 242          * Returns the change message according to the type of category membership change
 243          *
 244          * The message keys created in this method may be one of:
 245          * - recentchanges-page-added-to-category
 246          * - recentchanges-page-added-to-category-bundled
 247          * - recentchanges-page-removed-from-category
 248          * - recentchanges-page-removed-from-category-bundled
 249          *
 250          * @param int $type may be CategoryMembershipChange::CATEGORY_ADDITION
 251          * or CategoryMembershipChange::CATEGORY_REMOVAL
 252          * @param string $prefixedText result of Title::->getPrefixedText()
 253          * @param int $numTemplateLinks
 254          *
 255          * @return string
 256          */
 257         private function getChangeMessageText( $type, $prefixedText, $numTemplateLinks ) {
 258                 $array = [
 259                         self::CATEGORY_ADDITION => 'recentchanges-page-added-to-category',
 260                         self::CATEGORY_REMOVAL => 'recentchanges-page-removed-from-category',
 261                 ];
 262
 263                 $msgKey = $array[$type];
 264
 265                 if ( intval( $numTemplateLinks ) > 0 ) {
 266                         $msgKey .= '-bundled';
 267                 }
 268
 269                 return wfMessage( $msgKey, $prefixedText )->inContentLanguage()->text();
 270         }
 271
 272         /**
 273          * Returns the timestamp of the page's previous revision or null if the latest revision
 274          * does not refer to a parent revision
 275          *
 276          * @return null|string
 277          */
 278         private function getPreviousRevisionTimestamp() {
 279                 $previousRev = Revision::newFromId(
 280                                 $this->pageTitle->getPreviousRevisionID( $this->pageTitle->getLatestRevID() )
 281                         );
 282
 283                 return $previousRev ? $previousRev->getTimestamp() : null;
 284         }
 285
 286 }