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| 1 | <?php |
| 2 | /** |
| 3 | * Helper for validating on-wiki JSON config pages. |
| 4 | * |
| 5 | * Validates a specific JSON message page against a bundled JSON schema file when |
| 6 | * it is saved. |
| 7 | * |
| 8 | * @file |
| 9 | * @ingroup Extensions |
| 10 | * @copyright 2025 VisualEditor Team and others; see AUTHORS.txt |
| 11 | * @license MIT |
| 12 | */ |
| 13 | |
| 14 | namespace MediaWiki\Extension\VisualEditor; |
| 15 | |
| 16 | use JsonSchema\Validator; |
| 17 | use MediaWiki\Content\TextContent; |
| 18 | use MediaWiki\Revision\RenderedRevision; |
| 19 | use MediaWiki\Status\Status; |
| 20 | use Wikimedia\Message\MessageValue; |
| 21 | |
| 22 | class MediaWikiJsonSchemaValidator { |
| 23 | |
| 24 | /** |
| 25 | * Validate against a JSON schema. |
| 26 | * |
| 27 | * Intended to be called from a MultiContentSave hook handler, returning its |
| 28 | * result directly. Saves of unrelated pages, or non-text content, are ignored. |
| 29 | * |
| 30 | * @param RenderedRevision $renderedRevision The revision being saved |
| 31 | * @param Status $status Status to populate with a fatal error on failure |
| 32 | * @param string $pageDBkey Lower-cased DB key of the MediaWiki: page to validate, |
| 33 | * e.g. 'editcheck-config.json' |
| 34 | * @param string $schemaPath Absolute path to the JSON schema file to validate against |
| 35 | * @param string|null $definition Name of an entry within the schema's "definitions" to |
| 36 | * validate against instead of the whole schema, e.g. 'textMatchRuleInline'. This is |
| 37 | * used to validate files that hold just one part of the config (such as a TextMatch |
| 38 | * rule imported via the "import" key). When null, the full schema is used. |
| 39 | * @return bool|null False to abort the save when validation fails, null otherwise |
| 40 | */ |
| 41 | public static function validateOnSave( |
| 42 | RenderedRevision $renderedRevision, |
| 43 | Status $status, |
| 44 | string $pageDBkey, |
| 45 | string $schemaPath, |
| 46 | ?string $definition = null |
| 47 | ): ?bool { |
| 48 | $page = $renderedRevision->getRevision()->getPageAsLinkTarget(); |
| 49 | if ( |
| 50 | $page->getNamespace() !== NS_MEDIAWIKI || |
| 51 | strtolower( $page->getDBkey() ) !== $pageDBkey |
| 52 | ) { |
| 53 | return null; |
| 54 | } |
| 55 | $content = $renderedRevision->getRevision()->getMainContentRaw(); |
| 56 | if ( !( $content instanceof TextContent ) ) { |
| 57 | // If for some reason the content isn't text, we can't validate it |
| 58 | return null; |
| 59 | } |
| 60 | |
| 61 | return self::validate( $content, $status, $schemaPath, $definition ); |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Validate specific JSON content against a JSON schema. |
| 66 | * |
| 67 | * @param TextContent $content The content being saved |
| 68 | * @param Status $status See validateOnSave() |
| 69 | * @param string $schemaPath See validateOnSave() |
| 70 | * @param string|null $definition See validateOnSave() |
| 71 | * @return bool|null See validateOnSave() |
| 72 | */ |
| 73 | public static function validate( |
| 74 | TextContent $content, |
| 75 | Status $status, |
| 76 | string $schemaPath, |
| 77 | ?string $definition = null |
| 78 | ): ?bool { |
| 79 | $config = json_decode( $content->getText() ); |
| 80 | if ( json_last_error() !== JSON_ERROR_NONE ) { |
| 81 | $status->fatal( 'visualeditor-config-save-invalid-schema', json_last_error_msg() ); |
| 82 | return false; |
| 83 | } |
| 84 | |
| 85 | $schema = json_decode( file_get_contents( $schemaPath ) ); |
| 86 | if ( $definition !== null ) { |
| 87 | // Validate against a single named definition, while keeping the schema's other |
| 88 | // definitions in the document so internal $ref pointers still resolve. |
| 89 | $schema = (object)[ |
| 90 | '$ref' => '#/definitions/' . $definition, |
| 91 | 'definitions' => $schema->definitions, |
| 92 | ]; |
| 93 | } |
| 94 | |
| 95 | $validator = new Validator(); |
| 96 | $validator->validate( $config, $schema ); |
| 97 | if ( $validator->isValid() ) { |
| 98 | return null; |
| 99 | } |
| 100 | |
| 101 | $status->fatal( |
| 102 | // MessageValue ensures our formatted error is treated as wikitext. |
| 103 | new MessageValue( |
| 104 | 'visualeditor-config-save-invalid-schema', |
| 105 | [ self::formatSchemaErrors( $validator->getErrors() ) ] |
| 106 | ) |
| 107 | ); |
| 108 | return false; |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Format JSON schema validation errors as a wikitext definition list. |
| 113 | * |
| 114 | * @param array[] $errors Errors as returned by Validator::getErrors() |
| 115 | * @return string Wikitext |
| 116 | */ |
| 117 | private static function formatSchemaErrors( array $errors ): string { |
| 118 | $lastProperty = null; |
| 119 | return implode( '', array_map( |
| 120 | static function ( array $error ) use ( &$lastProperty ): string { |
| 121 | $prefix = ''; |
| 122 | if ( $lastProperty !== $error['property'] ) { |
| 123 | $prefix = "\n;<nowiki>" . $error['property'] . "</nowiki>"; |
| 124 | $lastProperty = $error['property']; |
| 125 | } |
| 126 | return $prefix . "\n:" . $error['message']; |
| 127 | }, |
| 128 | $errors |
| 129 | ) ); |
| 130 | } |
| 131 | } |