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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Rest\Handler; |
| 4 | |
| 5 | use MediaWiki\Rest\Handler; |
| 6 | use MediaWiki\Rest\LocalizedHttpException; |
| 7 | use MediaWiki\Rest\StringStream; |
| 8 | use MediaWiki\Revision\RevisionAccessException; |
| 9 | use MediaWiki\Revision\RevisionLookup; |
| 10 | use MediaWiki\Revision\RevisionRecord; |
| 11 | use MediaWiki\Revision\SlotRecord; |
| 12 | use MediaWiki\Revision\SuppressedDataException; |
| 13 | use ParserFactory; |
| 14 | use TextContent; |
| 15 | use Wikimedia\Message\MessageValue; |
| 16 | use Wikimedia\ParamValidator\ParamValidator; |
| 17 | |
| 18 | class CompareHandler extends Handler { |
| 19 | /** @var RevisionLookup */ |
| 20 | private $revisionLookup; |
| 21 | |
| 22 | /** @var ParserFactory */ |
| 23 | private $parserFactory; |
| 24 | |
| 25 | /** @var RevisionRecord[] */ |
| 26 | private $revisions = []; |
| 27 | |
| 28 | /** @var string[] */ |
| 29 | private $textCache = []; |
| 30 | |
| 31 | public function __construct( |
| 32 | RevisionLookup $revisionLookup, |
| 33 | ParserFactory $parserFactory |
| 34 | ) { |
| 35 | $this->revisionLookup = $revisionLookup; |
| 36 | $this->parserFactory = $parserFactory; |
| 37 | } |
| 38 | |
| 39 | public function execute() { |
| 40 | $fromRev = $this->getRevisionOrThrow( 'from' ); |
| 41 | $toRev = $this->getRevisionOrThrow( 'to' ); |
| 42 | |
| 43 | if ( $fromRev->getPageId() !== $toRev->getPageId() ) { |
| 44 | throw new LocalizedHttpException( |
| 45 | new MessageValue( 'rest-compare-page-mismatch' ), 400 ); |
| 46 | } |
| 47 | |
| 48 | if ( !$this->getAuthority()->authorizeRead( 'read', $toRev->getPage() ) ) { |
| 49 | throw new LocalizedHttpException( |
| 50 | new MessageValue( 'rest-compare-permission-denied' ), 403 ); |
| 51 | } |
| 52 | |
| 53 | $data = [ |
| 54 | 'from' => [ |
| 55 | 'id' => $fromRev->getId(), |
| 56 | 'slot_role' => $this->getRole(), |
| 57 | 'sections' => $this->getSectionInfo( 'from' ) |
| 58 | ], |
| 59 | 'to' => [ |
| 60 | 'id' => $toRev->getId(), |
| 61 | 'slot_role' => $this->getRole(), |
| 62 | 'sections' => $this->getSectionInfo( 'to' ) |
| 63 | ], |
| 64 | 'diff' => [ 'PLACEHOLDER' => null ] |
| 65 | ]; |
| 66 | $rf = $this->getResponseFactory(); |
| 67 | $wrapperJson = $rf->encodeJson( $data ); |
| 68 | $diff = $this->getJsonDiff(); |
| 69 | $response = $rf->create(); |
| 70 | $response->setHeader( 'Content-Type', 'application/json' ); |
| 71 | // A hack until getJsonDiff() is moved to SlotDiffRenderer and only nested inner diff is returned |
| 72 | $innerDiff = substr( $diff, 1, -1 ); |
| 73 | $response->setBody( new StringStream( |
| 74 | str_replace( '"diff":{"PLACEHOLDER":null}', $innerDiff, $wrapperJson ) ) ); |
| 75 | return $response; |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * @param string $paramName |
| 80 | * @return RevisionRecord|null |
| 81 | */ |
| 82 | private function getRevision( $paramName ) { |
| 83 | if ( !isset( $this->revisions[$paramName] ) ) { |
| 84 | $this->revisions[$paramName] = |
| 85 | $this->revisionLookup->getRevisionById( $this->getValidatedParams()[$paramName] ); |
| 86 | } |
| 87 | return $this->revisions[$paramName]; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * @param string $paramName |
| 92 | * @return RevisionRecord |
| 93 | * @throws LocalizedHttpException |
| 94 | */ |
| 95 | private function getRevisionOrThrow( $paramName ) { |
| 96 | $rev = $this->getRevision( $paramName ); |
| 97 | if ( !$rev ) { |
| 98 | throw new LocalizedHttpException( |
| 99 | new MessageValue( 'rest-compare-nonexistent', [ $paramName ] ), 404 ); |
| 100 | } |
| 101 | |
| 102 | if ( !$this->isAccessible( $rev ) ) { |
| 103 | throw new LocalizedHttpException( |
| 104 | new MessageValue( 'rest-compare-inaccessible', [ $paramName ] ), 403 ); |
| 105 | } |
| 106 | return $rev; |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * @param RevisionRecord $rev |
| 111 | * @return bool |
| 112 | */ |
| 113 | private function isAccessible( $rev ) { |
| 114 | return $rev->userCan( RevisionRecord::DELETED_TEXT, $this->getAuthority() ); |
| 115 | } |
| 116 | |
| 117 | private function getRole() { |
| 118 | return SlotRecord::MAIN; |
| 119 | } |
| 120 | |
| 121 | private function getRevisionText( $paramName ) { |
| 122 | if ( !isset( $this->textCache[$paramName] ) ) { |
| 123 | $revision = $this->getRevision( $paramName ); |
| 124 | try { |
| 125 | $content = $revision |
| 126 | ->getSlot( $this->getRole(), RevisionRecord::FOR_THIS_USER, $this->getAuthority() ) |
| 127 | ->getContent() |
| 128 | ->convert( CONTENT_MODEL_TEXT ); |
| 129 | if ( $content instanceof TextContent ) { |
| 130 | $this->textCache[$paramName] = $content->getText(); |
| 131 | } else { |
| 132 | throw new LocalizedHttpException( |
| 133 | new MessageValue( |
| 134 | 'rest-compare-wrong-content', |
| 135 | [ $this->getRole(), $paramName ] |
| 136 | ), |
| 137 | 400 ); |
| 138 | } |
| 139 | } catch ( SuppressedDataException $e ) { |
| 140 | throw new LocalizedHttpException( |
| 141 | new MessageValue( 'rest-compare-inaccessible', [ $paramName ] ), 403 ); |
| 142 | } catch ( RevisionAccessException $e ) { |
| 143 | throw new LocalizedHttpException( |
| 144 | new MessageValue( 'rest-compare-nonexistent', [ $paramName ] ), 404 ); |
| 145 | } |
| 146 | } |
| 147 | return $this->textCache[$paramName]; |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * @return string |
| 152 | */ |
| 153 | private function getJsonDiff() { |
| 154 | // TODO: properly implement |
| 155 | // This is a prototype only. SlotDiffRenderer should be extended to support this use case. |
| 156 | $fromText = $this->getRevisionText( 'from' ); |
| 157 | $toText = $this->getRevisionText( 'to' ); |
| 158 | if ( !function_exists( 'wikidiff2_inline_json_diff' ) ) { |
| 159 | throw new LocalizedHttpException( |
| 160 | new MessageValue( 'rest-compare-wikidiff2' ), 500 ); |
| 161 | } |
| 162 | return wikidiff2_inline_json_diff( $fromText, $toText, 2 ); |
| 163 | } |
| 164 | |
| 165 | /** |
| 166 | * @param string $paramName |
| 167 | * @return array |
| 168 | */ |
| 169 | private function getSectionInfo( $paramName ) { |
| 170 | $text = $this->getRevisionText( $paramName ); |
| 171 | $parserSections = $this->parserFactory->getInstance()->getFlatSectionInfo( $text ); |
| 172 | $sections = []; |
| 173 | foreach ( $parserSections as $i => $parserSection ) { |
| 174 | // Skip section zero, which comes before the first heading, since |
| 175 | // its offset is always zero, so the client can assume its location. |
| 176 | if ( $i !== 0 ) { |
| 177 | $sections[] = [ |
| 178 | 'level' => $parserSection['level'], |
| 179 | 'heading' => $parserSection['heading'], |
| 180 | 'offset' => $parserSection['offset'], |
| 181 | ]; |
| 182 | } |
| 183 | } |
| 184 | return $sections; |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * @inheritDoc |
| 189 | */ |
| 190 | public function needsWriteAccess() { |
| 191 | return false; |
| 192 | } |
| 193 | |
| 194 | public function getParamSettings() { |
| 195 | return [ |
| 196 | 'from' => [ |
| 197 | ParamValidator::PARAM_TYPE => 'integer', |
| 198 | ParamValidator::PARAM_REQUIRED => true, |
| 199 | Handler::PARAM_SOURCE => 'path', |
| 200 | ], |
| 201 | 'to' => [ |
| 202 | ParamValidator::PARAM_TYPE => 'integer', |
| 203 | ParamValidator::PARAM_REQUIRED => true, |
| 204 | Handler::PARAM_SOURCE => 'path', |
| 205 | ], |
| 206 | ]; |
| 207 | } |
| 208 | } |