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4 |
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 | } |