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<?php
namespace MediaWiki\Rest\Module;
use MediaWiki\HookContainer\HookContainer;
use MediaWiki\Rest\BasicAccess\BasicAuthorizerInterface;
use MediaWiki\Rest\Handler\RedirectHandler;
use MediaWiki\Rest\JsonLocalizer;
use MediaWiki\Rest\PathTemplateMatcher\ModuleConfigurationException;
use MediaWiki\Rest\Reporter\ErrorReporter;
use MediaWiki\Rest\ResponseFactory;
use MediaWiki\Rest\RouteDefinitionException;
use MediaWiki\Rest\Router;
use MediaWiki\Rest\Validator\Validator;
use Wikimedia\ObjectFactory\ObjectFactory;
/**
* A Module that is based on a module definition file similar to an OpenAPI spec.
* @see docs/rest/mwapi-1.0.json for the schema of module definition files.
*
* Just like an OpenAPI spec, the module definition file contains a "paths"
* section that maps paths and HTTP methods to operations. Each operation
* then specifies the PHP class that will handle the request under the "handler"
* key. The value of the "handler" key is an object spec for use with
* ObjectFactory::createObject.
*
* The following fields are supported as a shorthand notation:
* - "redirect": the route represents a redirect and will be handled by
* the RedirectHandler class. The redirect is specified as a JSON object
* that specifies the target "path", and optional the redirect "code".
* If a redirect is defined, the "handler" key must be omitted.
*
* More shorthands may be added in the future.
*
* Route definitions can contain additional fields to configure the handler.
* The handler can access the route definition by calling getConfig().
*
* @internal
* @since 1.43
*/
class SpecBasedModule extends MatcherBasedModule {
private string $definitionFile;
private ?array $moduleDef = null;
private ?int $routeFileTimestamp = null;
private ?string $configHash = null;
/**
* @internal
*/
public function __construct(
string $definitionFile,
Router $router,
string $pathPrefix,
ResponseFactory $responseFactory,
BasicAuthorizerInterface $basicAuth,
ObjectFactory $objectFactory,
Validator $restValidator,
ErrorReporter $errorReporter,
HookContainer $hookContainer
) {
parent::__construct(
$router,
$pathPrefix,
$responseFactory,
$basicAuth,
$objectFactory,
$restValidator,
$errorReporter,
$hookContainer
);
$this->definitionFile = $definitionFile;
}
/**
* Get a config version hash for cache invalidation
*/
protected function getConfigHash(): string {
if ( $this->configHash === null ) {
$this->configHash = md5( json_encode( [
'class' => __CLASS__,
'version' => 1,
'fileTimestamps' => $this->getRouteFileTimestamp()
] ) );
}
return $this->configHash;
}
/**
* Load the module definition file.
*/
private function getModuleDefinition(): array {
if ( $this->moduleDef !== null ) {
return $this->moduleDef;
}
$this->routeFileTimestamp = filemtime( $this->definitionFile );
$moduleDef = $this->loadJsonFile( $this->definitionFile );
if ( !$moduleDef ) {
throw new ModuleConfigurationException(
'Malformed module definition file: ' . $this->definitionFile
);
}
if ( !isset( $moduleDef['mwapi'] ) ) {
throw new ModuleConfigurationException(
'Missing mwapi version field in ' . $this->definitionFile
);
}
// Require OpenAPI version 3.1 or compatible.
if ( !version_compare( $moduleDef['mwapi'], '1.0.999', '<=' ) ||
!version_compare( $moduleDef['mwapi'], '1.0.0', '>=' )
) {
throw new ModuleConfigurationException(
"Unsupported openapi version {$moduleDef['mwapi']} in "
. $this->definitionFile
);
}
$localizer = new JsonLocalizer( $this->responseFactory );
$moduleDef = $localizer->localizeJson( $moduleDef );
$this->moduleDef = $moduleDef;
return $this->moduleDef;
}
/**
* Get last modification times of the module definition file.
*/
private function getRouteFileTimestamp(): int {
if ( $this->routeFileTimestamp === null ) {
$this->routeFileTimestamp = filemtime( $this->definitionFile );
}
return $this->routeFileTimestamp;
}
/**
* @unstable for testing
*
* @return array[]
*/
public function getDefinedPaths(): array {
$paths = [];
$moduleDef = $this->getModuleDefinition();
foreach ( $moduleDef['paths'] as $path => $pSpec ) {
$paths[$path] = [];
foreach ( $pSpec as $method => $opSpec ) {
$paths[$path][] = strtoupper( $method );
}
}
return $paths;
}
protected function initRoutes(): void {
$moduleDef = $this->getModuleDefinition();
// The structure is similar to OpenAPI, see docs/rest/mwapi.1.0.json
foreach ( $moduleDef['paths'] as $path => $pathSpec ) {
foreach ( $pathSpec as $method => $opSpec ) {
$info = $this->makeRouteInfo( $path, $opSpec );
$this->addRoute( $method, $path, $info );
}
}
}
/**
* Generate a route info array to be stored in the matcher tree,
* in the form expected by MatcherBasedModule::addRoute()
* and ultimately Module::getHandlerForPath().
*/
private function makeRouteInfo( string $path, array $opSpec ): array {
static $objectSpecKeys = [
'class',
'factory',
'services',
'optional_services',
'args',
];
static $oasKeys = [
'parameters',
'responses',
'summary',
'description',
'tags',
'externalDocs',
];
if ( isset( $opSpec['redirect'] ) ) {
// Redirect shorthand
$opSpec['handler'] = [
'class' => RedirectHandler::class,
'redirect' => $opSpec['redirect'],
];
unset( $opSpec['redirect'] );
}
$handlerSpec = $opSpec['handler'] ?? null;
if ( !$handlerSpec ) {
throw new RouteDefinitionException( 'Missing handler spec' );
}
$info = [
'spec' => array_intersect_key( $handlerSpec, array_flip( $objectSpecKeys ) ),
'config' => array_diff_key( $handlerSpec, array_flip( $objectSpecKeys ) ),
'OAS' => array_intersect_key( $opSpec, array_flip( $oasKeys ) ),
'path' => $path,
];
return $info;
}
public function getOpenApiInfo() {
$def = $this->getModuleDefinition();
return $def['info'] ?? [];
}
}