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| 1 | <?php |
| 2 | /** |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2 of the License, or |
| 6 | * (at your option) any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 16 | * http://www.gnu.org/copyleft/gpl.html |
| 17 | * |
| 18 | * @file |
| 19 | */ |
| 20 | |
| 21 | namespace MediaWiki\Storage; |
| 22 | |
| 23 | use MediaWiki\Config\ServiceOptions; |
| 24 | use MediaWiki\MainConfigNames; |
| 25 | use MediaWiki\Revision\RevisionRecord; |
| 26 | use MediaWiki\Revision\RevisionStore; |
| 27 | use Wikimedia\Assert\Assert; |
| 28 | |
| 29 | /** |
| 30 | * Builder class for the EditResult object. |
| 31 | * |
| 32 | * @internal Only for use by PageUpdater |
| 33 | * @since 1.35 |
| 34 | * @author Ostrzyciel |
| 35 | */ |
| 36 | class EditResultBuilder { |
| 37 | |
| 38 | public const CONSTRUCTOR_OPTIONS = [ |
| 39 | MainConfigNames::ManualRevertSearchRadius, |
| 40 | ]; |
| 41 | |
| 42 | /** |
| 43 | * A mapping from EditResult's revert methods to relevant change tags. |
| 44 | * For use by getRevertTags() |
| 45 | */ |
| 46 | private const REVERT_METHOD_TO_CHANGE_TAG = [ |
| 47 | EditResult::REVERT_UNDO => 'mw-undo', |
| 48 | EditResult::REVERT_ROLLBACK => 'mw-rollback', |
| 49 | EditResult::REVERT_MANUAL => 'mw-manual-revert' |
| 50 | ]; |
| 51 | |
| 52 | /** @var RevisionRecord|null */ |
| 53 | private $revisionRecord = null; |
| 54 | |
| 55 | /** @var bool */ |
| 56 | private $isNew = false; |
| 57 | |
| 58 | /** @var int|false */ |
| 59 | private $originalRevisionId = false; |
| 60 | |
| 61 | /** @var RevisionRecord|null */ |
| 62 | private $originalRevision = null; |
| 63 | |
| 64 | /** @var int|null */ |
| 65 | private $revertMethod = null; |
| 66 | |
| 67 | /** @var int|null */ |
| 68 | private $newestRevertedRevId = null; |
| 69 | |
| 70 | /** @var int|null */ |
| 71 | private $oldestRevertedRevId = null; |
| 72 | |
| 73 | /** @var int|null */ |
| 74 | private $revertAfterRevId = null; |
| 75 | |
| 76 | /** @var RevisionStore */ |
| 77 | private $revisionStore; |
| 78 | |
| 79 | /** @var string[] */ |
| 80 | private $softwareTags; |
| 81 | |
| 82 | /** @var ServiceOptions */ |
| 83 | private $options; |
| 84 | |
| 85 | /** |
| 86 | * @param RevisionStore $revisionStore |
| 87 | * @param string[] $softwareTags Array of currently enabled software change tags. Can be |
| 88 | * obtained from ChangeTags::getSoftwareTags() |
| 89 | * @param ServiceOptions $options Options for this instance. |
| 90 | */ |
| 91 | public function __construct( |
| 92 | RevisionStore $revisionStore, |
| 93 | array $softwareTags, |
| 94 | ServiceOptions $options |
| 95 | ) { |
| 96 | $options->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS ); |
| 97 | |
| 98 | $this->revisionStore = $revisionStore; |
| 99 | $this->softwareTags = $softwareTags; |
| 100 | $this->options = $options; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * @return EditResult |
| 105 | */ |
| 106 | public function buildEditResult(): EditResult { |
| 107 | if ( $this->revisionRecord === null ) { |
| 108 | throw new PageUpdateException( |
| 109 | 'Revision was not set prior to building an EditResult' |
| 110 | ); |
| 111 | } |
| 112 | |
| 113 | // If we don't know the original revision ID, but know which one was undone, try to find out |
| 114 | $this->guessOriginalRevisionId(); |
| 115 | |
| 116 | // do a last-minute check if this was a manual revert |
| 117 | $this->detectManualRevert(); |
| 118 | |
| 119 | return new EditResult( |
| 120 | $this->isNew, |
| 121 | $this->originalRevisionId, |
| 122 | $this->revertMethod, |
| 123 | $this->oldestRevertedRevId, |
| 124 | $this->newestRevertedRevId, |
| 125 | $this->isExactRevert(), |
| 126 | $this->isNullEdit(), |
| 127 | $this->getRevertTags() |
| 128 | ); |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Set the revision associated with this edit. |
| 133 | * Should only be called by PageUpdater when saving an edit. |
| 134 | * |
| 135 | * @param RevisionRecord $revisionRecord |
| 136 | */ |
| 137 | public function setRevisionRecord( RevisionRecord $revisionRecord ) { |
| 138 | $this->revisionRecord = $revisionRecord; |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Set whether the edit created a new page. |
| 143 | * Should only be called by PageUpdater when saving an edit. |
| 144 | * |
| 145 | * @param bool $isNew |
| 146 | */ |
| 147 | public function setIsNew( bool $isNew ) { |
| 148 | $this->isNew = $isNew; |
| 149 | } |
| 150 | |
| 151 | /** |
| 152 | * Marks this edit as a revert and applies relevant information. |
| 153 | * |
| 154 | * @param int $revertMethod The method used to make the revert: |
| 155 | * REVERT_UNDO, REVERT_ROLLBACK or REVERT_MANUAL |
| 156 | * @param int $newestRevertedRevId the revision ID of the latest reverted revision. |
| 157 | * @param int|null $revertAfterRevId the revision ID after which revisions |
| 158 | * are being reverted. Defaults to the revision before the $newestRevertedRevId. |
| 159 | */ |
| 160 | public function markAsRevert( |
| 161 | int $revertMethod, |
| 162 | int $newestRevertedRevId, |
| 163 | int $revertAfterRevId = null |
| 164 | ) { |
| 165 | Assert::parameter( |
| 166 | in_array( |
| 167 | $revertMethod, |
| 168 | [ EditResult::REVERT_UNDO, EditResult::REVERT_ROLLBACK, EditResult::REVERT_MANUAL ] |
| 169 | ), |
| 170 | '$revertMethod', |
| 171 | 'must be one of REVERT_UNDO, REVERT_ROLLBACK, REVERT_MANUAL' |
| 172 | ); |
| 173 | $this->revertAfterRevId = $revertAfterRevId; |
| 174 | |
| 175 | if ( $newestRevertedRevId ) { |
| 176 | $this->revertMethod = $revertMethod; |
| 177 | $this->newestRevertedRevId = $newestRevertedRevId; |
| 178 | $revertAfterRevision = $revertAfterRevId ? |
| 179 | $this->revisionStore->getRevisionById( $revertAfterRevId ) : |
| 180 | null; |
| 181 | $oldestRevertedRev = $revertAfterRevision ? |
| 182 | $this->revisionStore->getNextRevision( $revertAfterRevision ) : null; |
| 183 | if ( $oldestRevertedRev ) { |
| 184 | $this->oldestRevertedRevId = $oldestRevertedRev->getId(); |
| 185 | } else { |
| 186 | // Can't find the oldest reverted revision. |
| 187 | // Oh well, just mark the one we know was undone. |
| 188 | $this->oldestRevertedRevId = $this->newestRevertedRevId; |
| 189 | } |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * @param RevisionRecord|int|false|null $originalRevision |
| 195 | * RevisionRecord or revision ID for the original revision. |
| 196 | * False or null to unset. |
| 197 | */ |
| 198 | public function setOriginalRevision( $originalRevision ) { |
| 199 | if ( $originalRevision instanceof RevisionRecord ) { |
| 200 | $this->originalRevision = $originalRevision; |
| 201 | $this->originalRevisionId = $originalRevision->getId(); |
| 202 | } else { |
| 203 | $this->originalRevisionId = $originalRevision ?? false; |
| 204 | $this->originalRevision = null; // Will be lazy-loaded. |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * If this edit was not already marked as a revert using EditResultBuilder::markAsRevert(), |
| 210 | * tries to establish whether this was a manual revert, i.e. someone restored the page to |
| 211 | * an exact previous state manually. |
| 212 | * |
| 213 | * If successful, mutates the builder accordingly. |
| 214 | */ |
| 215 | private function detectManualRevert() { |
| 216 | $searchRadius = $this->options->get( MainConfigNames::ManualRevertSearchRadius ); |
| 217 | if ( !$searchRadius || |
| 218 | // we already marked this as a revert |
| 219 | $this->revertMethod !== null || |
| 220 | // it's a null edit, nothing was reverted |
| 221 | $this->isNullEdit() || |
| 222 | // we wouldn't be able to figure out what was the newest reverted edit |
| 223 | // this also discards new pages |
| 224 | !$this->revisionRecord->getParentId() |
| 225 | ) { |
| 226 | return; |
| 227 | } |
| 228 | |
| 229 | $revertedToRev = $this->revisionStore->findIdenticalRevision( $this->revisionRecord, $searchRadius ); |
| 230 | if ( !$revertedToRev ) { |
| 231 | return; |
| 232 | } |
| 233 | $oldestReverted = $this->revisionStore->getNextRevision( $revertedToRev ); |
| 234 | if ( !$oldestReverted ) { |
| 235 | return; |
| 236 | } |
| 237 | |
| 238 | $this->setOriginalRevision( $revertedToRev ); |
| 239 | $this->revertMethod = EditResult::REVERT_MANUAL; |
| 240 | $this->oldestRevertedRevId = $oldestReverted->getId(); |
| 241 | $this->newestRevertedRevId = $this->revisionRecord->getParentId(); |
| 242 | $this->revertAfterRevId = $revertedToRev->getId(); |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * In case we have not got the original revision ID, try to guess. |
| 247 | */ |
| 248 | private function guessOriginalRevisionId() { |
| 249 | if ( !$this->originalRevisionId ) { |
| 250 | if ( $this->revertAfterRevId ) { |
| 251 | $this->setOriginalRevision( $this->revertAfterRevId ); |
| 252 | } elseif ( $this->newestRevertedRevId ) { |
| 253 | // Try finding the original revision ID by assuming it's the one before the edit |
| 254 | // that is being reverted. |
| 255 | $undidRevision = $this->revisionStore->getRevisionById( $this->newestRevertedRevId ); |
| 256 | if ( $undidRevision ) { |
| 257 | $originalRevision = $this->revisionStore->getPreviousRevision( $undidRevision ); |
| 258 | if ( $originalRevision ) { |
| 259 | $this->setOriginalRevision( $originalRevision ); |
| 260 | } |
| 261 | } |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | // Make sure original revision's content is the same as |
| 266 | // the new content and save the original revision ID. |
| 267 | if ( $this->getOriginalRevision() && |
| 268 | !$this->getOriginalRevision()->hasSameContent( $this->revisionRecord ) |
| 269 | ) { |
| 270 | $this->setOriginalRevision( false ); |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * Returns the revision that is being repeated or restored. |
| 276 | * Returns null if not set for this edit. |
| 277 | * |
| 278 | * @return RevisionRecord|null |
| 279 | */ |
| 280 | private function getOriginalRevision(): ?RevisionRecord { |
| 281 | if ( $this->originalRevision ) { |
| 282 | return $this->originalRevision; |
| 283 | } |
| 284 | if ( !$this->originalRevisionId ) { |
| 285 | return null; |
| 286 | } |
| 287 | |
| 288 | $this->originalRevision = $this->revisionStore->getRevisionById( $this->originalRevisionId ); |
| 289 | return $this->originalRevision; |
| 290 | } |
| 291 | |
| 292 | /** |
| 293 | * Whether the edit was an exact revert, i.e. the contents of the revert |
| 294 | * revision and restored revision match |
| 295 | * |
| 296 | * @return bool |
| 297 | */ |
| 298 | private function isExactRevert(): bool { |
| 299 | if ( $this->isNew || $this->oldestRevertedRevId === null ) { |
| 300 | return false; |
| 301 | } |
| 302 | |
| 303 | $originalRevision = $this->getOriginalRevision(); |
| 304 | if ( !$originalRevision ) { |
| 305 | // we can't find the original revision for some reason, better return false |
| 306 | return false; |
| 307 | } |
| 308 | |
| 309 | return $this->revisionRecord->hasSameContent( $originalRevision ); |
| 310 | } |
| 311 | |
| 312 | /** |
| 313 | * An edit is a null edit if the original revision is equal to the parent revision. |
| 314 | * |
| 315 | * @return bool |
| 316 | */ |
| 317 | private function isNullEdit(): bool { |
| 318 | if ( $this->isNew ) { |
| 319 | return false; |
| 320 | } |
| 321 | |
| 322 | return $this->getOriginalRevision() && |
| 323 | $this->originalRevisionId === $this->revisionRecord->getParentId(); |
| 324 | } |
| 325 | |
| 326 | /** |
| 327 | * Returns an array of revert-related tags that will be applied automatically to this edit. |
| 328 | * |
| 329 | * @return string[] |
| 330 | */ |
| 331 | private function getRevertTags(): array { |
| 332 | if ( isset( self::REVERT_METHOD_TO_CHANGE_TAG[$this->revertMethod] ) ) { |
| 333 | $revertTag = self::REVERT_METHOD_TO_CHANGE_TAG[$this->revertMethod]; |
| 334 | if ( in_array( $revertTag, $this->softwareTags ) ) { |
| 335 | return [ $revertTag ]; |
| 336 | } |
| 337 | } |
| 338 | return []; |
| 339 | } |
| 340 | } |