wiki.techinc.nl/tests/phpunit/structure/RestStructureTest.php

<?php

use MediaWiki\HookContainer\HookContainer;
use MediaWiki\HookContainer\StaticHookRegistry;
use MediaWiki\MainConfigSchema;
use MediaWiki\MediaWikiServices;
use MediaWiki\Permissions\SimpleAuthority;
use MediaWiki\Rest\CorsUtils;
use MediaWiki\Rest\EntryPoint;
use MediaWiki\Rest\Handler;
use MediaWiki\Rest\PathTemplateMatcher\PathMatcher;
use MediaWiki\Rest\RequestData;
use MediaWiki\Rest\ResponseFactory;
use MediaWiki\Rest\Router;
use MediaWiki\Session\Session;
use MediaWiki\User\UserIdentityValue;
use Wikimedia\ObjectFactory\ObjectFactory;
use Wikimedia\ParamValidator\ParamValidator;
use Wikimedia\TestingAccessWrapper;

/**
 * Checks that all REST Handlers, core and extensions, conform to the conventions:
 * - parameters in path have correct PARAM_SOURCE
 * - path parameters not in path are not required
 * - do not have inconsistencies in the parameter definitions
 *
 * @coversNothing
 */
class RestStructureTest extends MediaWikiIntegrationTestCase {

	/** @var ?Router */
	private $router = null;

	/**
	 * Constructs a fake MediaWikiServices instance for use in data providers.
	 *
	 * @return MediaWikiServices
	 */
	private function getFakeServiceContainer(): MediaWikiServices {
		$config = new HashConfig( iterator_to_array( MainConfigSchema::listDefaultValues() ) );

		$objectFactory = $this->createNoOpMock( ObjectFactory::class );
		$hookContainer = new HookContainer(
			new StaticHookRegistry(),
			$objectFactory
		);

		$services = $this->createNoOpMock(
			MediaWikiServices::class,
			[
				'getMainConfig',
				'getHookContainer',
				'getObjectFactory',
				'getLocalServerObjectCache',
				'getStatsdDataFactory',
			]
		);
		$services->method( 'getMainConfig' )->willReturn( $config );
		$services->method( 'getHookContainer' )->willReturn( $hookContainer );
		$services->method( 'getObjectFactory' )->willReturn( $objectFactory );
		$services->method( 'getLocalServerObjectCache' )->willReturn( new EmptyBagOStuff() );
		$services->method( 'getStatsdDataFactory' )->willReturn( new NullStatsdDataFactory() );

		return $services;
	}

	/**
	 * Return all routes. Safe to use in data providers.
	 * @return Iterator<array>
	 */
	private function getAllRoutes(): Iterator {
		static $router = null;

		if ( !$router ) {
			$language = $this->createNoOpMock( Language::class, [ 'getCode' ] );
			$language->method( 'getCode' )->willReturn( 'en' );

			$title = Title::makeTitle( NS_SPECIAL, 'Badtitle/dummy title for RestStructureTest' );
			$authority = new SimpleAuthority( new UserIdentityValue( 0, 'Testor' ), [] );

			$request = $this->createNoOpMock(
				WebRequest::class,
				[ 'getSession' ]
			);
			$request->method( 'getSession' )->willReturn(
				$this->createNoOpMock( Session::class )
			);

			$context = $this->createNoOpMock(
				RequestContext::class,
				[ 'getLanguage', 'getTitle', 'getAuthority', 'getRequest' ]
			);
			$context->method( 'getLanguage' )->willReturn( $language );
			$context->method( 'getTitle' )->willReturn( $title );
			$context->method( 'getAuthority' )->willReturn( $authority );
			$context->method( 'getRequest' )->willReturn( $request );

			$responseFactory = $this->createNoOpMock( ResponseFactory::class );
			$cors = $this->createNoOpMock( CorsUtils::class );

			$services = $this->getFakeServiceContainer();

			// NOTE: createRouter() implements the logic for determining the list of route files to load.
			$entryPoint = TestingAccessWrapper::newFromClass( EntryPoint::class );
			$router = $entryPoint->createRouter( $services, $context, new RequestData(), $responseFactory, $cors );
			$router = TestingAccessWrapper::newFromObject( $router );
		}

		return $router->getAllRoutes();
	}

	/**
	 * Initialize/fetch the Router instance for testing
	 * @warning Must not be called in data providers!
	 * @return Router
	 */
	private function getRouter(): Router {
		if ( !$this->router ) {
			$context = new DerivativeContext( RequestContext::getMain() );
			$context->setLanguage( 'en' );
			$context->setTitle(
				Title::makeTitle( NS_SPECIAL, 'Badtitle/dummy title for RestStructureTest' )
			);

			$responseFactory = $this->createNoOpMock( ResponseFactory::class );
			$cors = $this->createNoOpMock( CorsUtils::class );

			$this->router = TestingAccessWrapper::newFromClass( EntryPoint::class )
				->createRouter( $this->getServiceContainer(), $context, new RequestData(), $responseFactory, $cors );
		}
		return $this->router;
	}

	/**
	 * @dataProvider provideRoutes
	 */
	public function testPathParameters( array $spec ): void {
		$router = TestingAccessWrapper::newFromObject( $this->getRouter() );
		$request = new RequestData();
		$handler = $router->createHandler( $request, $spec );
		$params = $handler->getParamSettings();

		$dataName = $this->dataName();

		// Test that all parameters in the path exist and are declared as such
		$matcher = TestingAccessWrapper::newFromObject( new PathMatcher );
		$pathParams = [];
		foreach ( explode( '/', $spec['path'] ) as $part ) {
			$param = $matcher->getParamName( $part );
			if ( $param !== false ) {
				$this->assertArrayHasKey( $param, $params, "Path parameter $param exists" );
				$this->assertSame( 'path', $params[$param][Handler::PARAM_SOURCE] ?? null,
					"$dataName: Path parameter {{$param}} must have PARAM_SOURCE = 'path'" );
				$pathParams[$param] = true;
			}
		}

		// Test that any path parameters not in the path aren't marked as required
		foreach ( $params as $param => $settings ) {
			if ( ( $settings[Handler::PARAM_SOURCE] ?? null ) === 'path' &&
				!isset( $pathParams[$param] )
			) {
				$this->assertFalse( $settings[ParamValidator::PARAM_REQUIRED] ?? false,
					"$dataName, parameter $param: PARAM_REQUIRED cannot be true for a path parameter "
					. 'not in the path'
				);
			}
		}

		// In case there were no path parameters
		$this->addToAssertionCount( 1 );
	}

	public function provideRoutes(): Iterator {
		foreach ( $this->getAllRoutes() as $spec ) {
			$method = $spec['method'] ?? 'GET';
			$method = implode( ",", (array)$method );

			yield "Handler {$method} {$spec['path']}" => [ $spec ];
		}
	}

	/**
	 * @dataProvider provideRoutes
	 */
	public function testParameters( array $routeSpec ): void {
		$router = TestingAccessWrapper::newFromObject( $this->getRouter() );

		$request = new RequestData();
		$handler = $router->createHandler( $request, $routeSpec );

		$params = $handler->getParamSettings();
		foreach ( $params as $param => $settings ) {
			$method = $routeSpec['method'] ?? 'GET';
			$method = implode( ",", (array)$method );

			$this->assertParameter( $param, $settings, "Handler {$method} {$routeSpec['path']}, parameter $param" );
		}
	}

	private function assertParameter( string $name, $settings, $msg ) {
		static $sources = [ 'path', 'query', 'post' ];

		$router = TestingAccessWrapper::newFromObject( $this->getRouter() );

		$dataName = $this->dataName();
		$this->assertNotSame( '', $name, "$msg: $dataName: Name cannot be empty" );

		$paramValidator = TestingAccessWrapper::newFromObject( $router->restValidator )->paramValidator;
		$ret = $paramValidator->checkSettings( $name, $settings, [ 'source' => 'unspecified' ] );

		// REST-specific parameters
		$ret['allowedKeys'][] = Handler::PARAM_SOURCE;
		if ( !in_array( $settings[Handler::PARAM_SOURCE] ?? '', $sources, true ) ) {
			$ret['issues'][Handler::PARAM_SOURCE] = "PARAM_SOURCE must be 'path', 'query', or 'post'";
		}

		// Warn about unknown keys. Don't fail, they might be for forward- or back-compat.
		if ( is_array( $settings ) ) {
			$keys = array_diff(
				array_keys( $settings ),
				$ret['allowedKeys']
			);
			if ( $keys ) {
				$this->addWarning(
					"$msg: $dataName: Unrecognized settings keys were used: " . implode( ', ', $keys )
				);
			}
		}

		if ( count( $ret['issues'] ) === 1 ) {
			$this->fail( "$msg: $dataName: Validation failed: " . reset( $ret['issues'] ) );
		} elseif ( $ret['issues'] ) {
			$this->fail( "$msg: $dataName: Validation failed:\n* " . implode( "\n* ", $ret['issues'] ) );
		}

		// Check message existence
		$done = [];
		foreach ( $ret['messages'] as $msg ) {
			// We don't really care about the parameters, so do it simply
			$key = $msg->getKey();
			if ( !isset( $done[$key] ) ) {
				$done[$key] = true;
				$this->assertTrue( Message::newFromKey( $key )->exists(),
					"$msg: $dataName: Parameter message $key exists" );
			}
		}
	}

	public function testRoutePathAndMethodForDuplicates() {
		$router = TestingAccessWrapper::newFromObject( $this->getRouter() );
		$routes = [];

		foreach ( $router->getAllRoutes() as $spec ) {
			$method = $spec['method'] ?? 'GET';
			$method = (array)$method;

			foreach ( $method as $m ) {
				$key = "{$m} {$spec['path']}";

				$this->assertArrayNotHasKey( $key, $routes, "{$key} already exists in routes" );

				$routes[$key] = true;
			}
		}
	}
}