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<?php
namespace MediaWiki\Rest\Module;
use InvalidArgumentException;
use MediaWiki\Rest\PathTemplateMatcher\PathMatcher;
/**
* MatcherBasedModules respond to requests by matching the requested path
* against a list of known routes to identify the appropriate handler.
*
* @see Matcher
*
* @since 1.43
*/
abstract class MatcherBasedModule extends Module {
/** @var PathMatcher[] Path matchers by method */
private ?array $matchers = [];
private bool $matchersInitialized = false;
public function getCacheData(): array {
$cacheData = [];
foreach ( $this->getMatchers() as $method => $matcher ) {
$cacheData[$method] = $matcher->getCacheData();
}
$cacheData[self::CACHE_CONFIG_HASH_KEY] = $this->getConfigHash();
return $cacheData;
}
public function initFromCacheData( array $cacheData ): bool {
if ( $cacheData[self::CACHE_CONFIG_HASH_KEY] !== $this->getConfigHash() ) {
return false;
}
unset( $cacheData[self::CACHE_CONFIG_HASH_KEY] );
$this->matchers = [];
foreach ( $cacheData as $method => $data ) {
$this->matchers[$method] = PathMatcher::newFromCache( $data );
}
$this->matchersInitialized = true;
return true;
}
/**
* Get a config version hash for cache invalidation
*
* @return string
*/
abstract protected function getConfigHash(): string;
/**
* Get an array of PathMatcher objects indexed by HTTP method
*
* @return PathMatcher[]
*/
protected function getMatchers() {
if ( !$this->matchersInitialized ) {
$this->initRoutes();
$this->matchersInitialized = true;
}
return $this->matchers;
}
/**
* Initialize matchers by calling addRoute() for each known route.
*/
abstract protected function initRoutes(): void;
/**
* @param string|string[] $method The method(s) the route should be registered for
* @param string $path The path pattern for the route
* @param array $info Information to be associated with the route. Supported keys:
* - "spec": an object spec for use with ObjectFactory for constructing a Handler object.
* - "config": an array of configuration valies to be passed to Handler::initContext.
*/
protected function addRoute( $method, string $path, array $info ) {
$methods = (array)$method;
// Make sure the matched path is known.
if ( !isset( $info['spec'] ) ) {
throw new InvalidArgumentException( 'Missing key in $info: "spec"' );
}
$info['path'] = $path;
foreach ( $methods as $method ) {
$method = strtoupper( $method );
if ( !isset( $this->matchers[$method] ) ) {
$this->matchers[$method] = new PathMatcher;
}
$this->matchers[$method]->add( $path, $info );
}
}
/**
* @inheritDoc
*/
public function findHandlerMatch(
string $path,
string $requestMethod
): array {
$requestMethod = strtoupper( $requestMethod );
$matchers = $this->getMatchers();
$matcher = $matchers[$requestMethod] ?? null;
$match = $matcher ? $matcher->match( $path ) : null;
if ( !$match ) {
// Return allowed methods, to support CORS and 405 responses.
return [
'found' => false,
'methods' => $this->getAllowedMethods( $path ),
];
} else {
$info = $match['userData'];
$info['found'] = true;
$info['method'] = $requestMethod;
$info['params'] = $match['params'] ?? [];
return $info;
}
}
/**
* Get the allowed methods for a path.
* Useful to check for 405 wrong method.
*
* @param string $relPath A concrete request path.
* @return string[]
*/
public function getAllowedMethods( string $relPath ): array {
$allowed = [];
foreach ( $this->getMatchers() as $allowedMethod => $allowedMatcher ) {
if ( $allowedMatcher->match( $relPath ) ) {
$allowed[] = $allowedMethod;
}
}
return array_unique(
in_array( 'GET', $allowed ) ? array_merge( [ 'HEAD' ], $allowed ) : $allowed
);
}
}