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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Rest\Module; |
| 4 | |
| 5 | use InvalidArgumentException; |
| 6 | use MediaWiki\Rest\PathTemplateMatcher\PathMatcher; |
| 7 | |
| 8 | /** |
| 9 | * MatcherBasedModules respond to requests by matching the requested path |
| 10 | * against a list of known routes to identify the appropriate handler. |
| 11 | * |
| 12 | * @see Matcher |
| 13 | * |
| 14 | * @since 1.43 |
| 15 | */ |
| 16 | abstract class MatcherBasedModule extends Module { |
| 17 | |
| 18 | /** @var PathMatcher[] Path matchers by method */ |
| 19 | private ?array $matchers = []; |
| 20 | |
| 21 | private bool $matchersInitialized = false; |
| 22 | |
| 23 | public function getCacheData(): array { |
| 24 | $cacheData = []; |
| 25 | |
| 26 | foreach ( $this->getMatchers() as $method => $matcher ) { |
| 27 | $cacheData[$method] = $matcher->getCacheData(); |
| 28 | } |
| 29 | |
| 30 | $cacheData[self::CACHE_CONFIG_HASH_KEY] = $this->getConfigHash(); |
| 31 | return $cacheData; |
| 32 | } |
| 33 | |
| 34 | public function initFromCacheData( array $cacheData ): bool { |
| 35 | if ( $cacheData[self::CACHE_CONFIG_HASH_KEY] !== $this->getConfigHash() ) { |
| 36 | return false; |
| 37 | } |
| 38 | |
| 39 | unset( $cacheData[self::CACHE_CONFIG_HASH_KEY] ); |
| 40 | $this->matchers = []; |
| 41 | |
| 42 | foreach ( $cacheData as $method => $data ) { |
| 43 | $this->matchers[$method] = PathMatcher::newFromCache( $data ); |
| 44 | } |
| 45 | |
| 46 | $this->matchersInitialized = true; |
| 47 | return true; |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Get a config version hash for cache invalidation |
| 52 | * |
| 53 | * @return string |
| 54 | */ |
| 55 | abstract protected function getConfigHash(): string; |
| 56 | |
| 57 | /** |
| 58 | * Get an array of PathMatcher objects indexed by HTTP method |
| 59 | * |
| 60 | * @return PathMatcher[] |
| 61 | */ |
| 62 | protected function getMatchers() { |
| 63 | if ( !$this->matchersInitialized ) { |
| 64 | $this->initRoutes(); |
| 65 | $this->matchersInitialized = true; |
| 66 | } |
| 67 | |
| 68 | return $this->matchers; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Initialize matchers by calling addRoute() for each known route. |
| 73 | */ |
| 74 | abstract protected function initRoutes(): void; |
| 75 | |
| 76 | /** |
| 77 | * @param string|string[] $method The method(s) the route should be registered for |
| 78 | * @param string $path The path pattern for the route |
| 79 | * @param array $info Information to be associated with the route. Supported keys: |
| 80 | * - "spec": an object spec for use with ObjectFactory for constructing a Handler object. |
| 81 | * - "config": an array of configuration valies to be passed to Handler::initContext. |
| 82 | */ |
| 83 | protected function addRoute( $method, string $path, array $info ) { |
| 84 | $methods = (array)$method; |
| 85 | |
| 86 | // Make sure the matched path is known. |
| 87 | if ( !isset( $info['spec'] ) ) { |
| 88 | throw new InvalidArgumentException( 'Missing key in $info: "spec"' ); |
| 89 | } |
| 90 | |
| 91 | $info['path'] = $path; |
| 92 | |
| 93 | foreach ( $methods as $method ) { |
| 94 | $method = strtoupper( $method ); |
| 95 | |
| 96 | if ( !isset( $this->matchers[$method] ) ) { |
| 97 | $this->matchers[$method] = new PathMatcher; |
| 98 | } |
| 99 | |
| 100 | $this->matchers[$method]->add( $path, $info ); |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * @inheritDoc |
| 106 | */ |
| 107 | public function findHandlerMatch( |
| 108 | string $path, |
| 109 | string $requestMethod |
| 110 | ): array { |
| 111 | $requestMethod = strtoupper( $requestMethod ); |
| 112 | |
| 113 | $matchers = $this->getMatchers(); |
| 114 | $matcher = $matchers[$requestMethod] ?? null; |
| 115 | $match = $matcher ? $matcher->match( $path ) : null; |
| 116 | |
| 117 | if ( !$match ) { |
| 118 | // Return allowed methods, to support CORS and 405 responses. |
| 119 | return [ |
| 120 | 'found' => false, |
| 121 | 'methods' => $this->getAllowedMethods( $path ), |
| 122 | ]; |
| 123 | } else { |
| 124 | $info = $match['userData']; |
| 125 | $info['found'] = true; |
| 126 | $info['method'] = $requestMethod; |
| 127 | $info['params'] = $match['params'] ?? []; |
| 128 | |
| 129 | return $info; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * Get the allowed methods for a path. |
| 135 | * Useful to check for 405 wrong method. |
| 136 | * |
| 137 | * @param string $relPath A concrete request path. |
| 138 | * @return string[] |
| 139 | */ |
| 140 | public function getAllowedMethods( string $relPath ): array { |
| 141 | $allowed = []; |
| 142 | foreach ( $this->getMatchers() as $allowedMethod => $allowedMatcher ) { |
| 143 | if ( $allowedMatcher->match( $relPath ) ) { |
| 144 | $allowed[] = $allowedMethod; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | return array_unique( |
| 149 | in_array( 'GET', $allowed ) ? array_merge( [ 'HEAD' ], $allowed ) : $allowed |
| 150 | ); |
| 151 | } |
| 152 | |
| 153 | } |