wikimedia/mediawiki-extensions-Wikibase

<?php declare( strict_types=1 );

namespace Wikibase\Repo\RestApi\RouteHandlers;

use MediaWiki\HookContainer\HookRunner;
use MediaWiki\MediaWikiServices;
use MediaWiki\Rest\Handler;
use MediaWiki\Rest\RequestInterface;
use MediaWiki\Rest\Response;
use MediaWiki\Rest\ResponseInterface;
use MediaWiki\Rest\SimpleHandler;
use MediaWiki\Rest\StringStream;
use MediaWiki\Rest\Validator\Validator;
use Wikibase\Repo\RestApi\Application\Serialization\StatementSerializer;
use Wikibase\Repo\RestApi\Application\UseCases\ItemRedirect;
use Wikibase\Repo\RestApi\Application\UseCases\ReplaceStatement\ReplaceStatement;
use Wikibase\Repo\RestApi\Application\UseCases\ReplaceStatement\ReplaceStatementRequest;
use Wikibase\Repo\RestApi\Application\UseCases\ReplaceStatement\ReplaceStatementResponse;
use Wikibase\Repo\RestApi\Application\UseCases\UseCaseError;
use Wikibase\Repo\RestApi\RouteHandlers\Middleware\AuthenticationMiddleware;
use Wikibase\Repo\RestApi\RouteHandlers\Middleware\BotRightCheckMiddleware;
use Wikibase\Repo\RestApi\RouteHandlers\Middleware\MiddlewareHandler;
use Wikibase\Repo\RestApi\RouteHandlers\Middleware\RequestPreconditionCheck;
use Wikibase\Repo\RestApi\RouteHandlers\Middleware\TempUserCreationResponseHeaderMiddleware;
use Wikibase\Repo\RestApi\RouteHandlers\Middleware\UserAgentCheckMiddleware;
use Wikibase\Repo\RestApi\WbRestApi;
use Wikimedia\ParamValidator\ParamValidator;

/**
 * @license GPL-2.0-or-later
 */
class ReplaceStatementRouteHandler extends SimpleHandler {
    use AssertValidTopLevelFields;

    private const STATEMENT_ID_PATH_PARAM = 'statement_id';
    private const STATEMENT_BODY_PARAM = 'statement';
    private const TAGS_BODY_PARAM = 'tags';
    private const BOT_BODY_PARAM = 'bot';
    private const COMMENT_BODY_PARAM = 'comment';

    private ReplaceStatement $useCase;
    private StatementSerializer $statementSerializer;
    private MiddlewareHandler $middlewareHandler;
    private ResponseFactory $responseFactory;

    public function __construct(
        ReplaceStatement $useCase,
        StatementSerializer $statementSerializer,
        MiddlewareHandler $middlewareHandler,
        ResponseFactory $responseFactory
    ) {
        $this->useCase = $useCase;
        $this->statementSerializer = $statementSerializer;
        $this->middlewareHandler = $middlewareHandler;
        $this->responseFactory = $responseFactory;
    }

    public static function factory(): Handler {
        $responseFactory = new ResponseFactory();
        return new self(
            WbRestApi::getReplaceStatement(),
            WbRestApi::getStatementSerializer(),
            new MiddlewareHandler( [
                WbRestApi::getUnexpectedErrorHandlerMiddleware(),
                new UserAgentCheckMiddleware(),
                new AuthenticationMiddleware( MediaWikiServices::getInstance()->getUserIdentityUtils() ),
                new BotRightCheckMiddleware( MediaWikiServices::getInstance()->getPermissionManager(), $responseFactory ),
                WbRestApi::getPreconditionMiddlewareFactory()->newPreconditionMiddleware(
                    fn( RequestInterface $request ): string => RequestPreconditionCheck::getSubjectIdPrefixFromStatementId(
                        $request->getPathParam( self::STATEMENT_ID_PATH_PARAM )
                    )
                ),
                WbRestApi::getStatementRedirectMiddlewareFactory()->newStatementRedirectMiddleware(
                    self::STATEMENT_ID_PATH_PARAM
                ),
                new TempUserCreationResponseHeaderMiddleware( new HookRunner( MediaWikiServices::getInstance()->getHookContainer() ) ),
            ] ),
            $responseFactory
        );
    }

    /**
     * Preconditions are checked via {@link PreconditionMiddleware}
     */
    public function checkPreconditions(): ?ResponseInterface {
        return null;
    }

    /**
     * @param mixed ...$args
     */
    public function run( ...$args ): Response {
        return $this->middlewareHandler->run( $this, [ $this, 'runUseCase' ], $args );
    }

    public function runUseCase( string $statementId ): Response {
        $requestBody = $this->getValidatedBody();
        '@phan-var array $requestBody'; // guaranteed to be an array per getBodyParamSettings()

        try {
            $useCaseResponse = $this->useCase->execute( new ReplaceStatementRequest(
                $statementId,
                $requestBody[self::STATEMENT_BODY_PARAM],
                $requestBody[self::TAGS_BODY_PARAM],
                $requestBody[self::BOT_BODY_PARAM],
                $requestBody[self::COMMENT_BODY_PARAM],
                $this->getUsername()
            ) );
            return $this->newSuccessHttpResponse( $useCaseResponse );
        } catch ( UseCaseError $e ) {
            return $this->responseFactory->newErrorResponseFromException( $e );
        } catch ( ItemRedirect $e ) {
            return $this->responseFactory
                ->newErrorResponseFromException( UseCaseError::newResourceNotFound( 'statement' ) );
        }
    }

    public function validate( Validator $restValidator ): void {
        $this->assertValidTopLevelTypes( $this->getRequest()->getParsedBody(), $this->getBodyParamSettings() );
        parent::validate( $restValidator );
    }

    public function getParamSettings(): array {
        return [
            self::STATEMENT_ID_PATH_PARAM => [
                self::PARAM_SOURCE => 'path',
                ParamValidator::PARAM_TYPE => 'string',
                ParamValidator::PARAM_REQUIRED => true,
            ],
        ];
    }

    public function getBodyParamSettings(): array {
        return [
            self::STATEMENT_BODY_PARAM => [
                self::PARAM_SOURCE => 'body',
                ParamValidator::PARAM_TYPE => /* object */ 'array',
                ParamValidator::PARAM_REQUIRED => true,
            ],
            self::TAGS_BODY_PARAM => [
                self::PARAM_SOURCE => 'body',
                ParamValidator::PARAM_TYPE => 'array',
                ParamValidator::PARAM_REQUIRED => false,
                ParamValidator::PARAM_DEFAULT => [],
            ],
            self::BOT_BODY_PARAM => [
                self::PARAM_SOURCE => 'body',
                ParamValidator::PARAM_TYPE => 'boolean',
                ParamValidator::PARAM_REQUIRED => false,
                ParamValidator::PARAM_DEFAULT => false,
            ],
            self::COMMENT_BODY_PARAM => [
                self::PARAM_SOURCE => 'body',
                ParamValidator::PARAM_TYPE => 'string',
                ParamValidator::PARAM_REQUIRED => false,
            ],
        ];
    }

    private function newSuccessHttpResponse( ReplaceStatementResponse $useCaseResponse ): Response {
        $httpResponse = $this->getResponseFactory()->create();
        $httpResponse->setStatus( 200 );
        $httpResponse->setHeader( 'Content-Type', 'application/json' );
        $httpResponse->setHeader(
            'Last-Modified',
            wfTimestamp( TS_RFC2822, $useCaseResponse->getLastModified() )
        );
        $httpResponse->setHeader( 'ETag', "\"{$useCaseResponse->getRevisionId()}\"" );
        $httpResponse->setBody( new StringStream( json_encode(
            $this->statementSerializer->serialize( $useCaseResponse->getStatement() )
        ) ) );

        return $httpResponse;
    }

    private function getUsername(): ?string {
        $mwUser = $this->getAuthority()->getUser();
        return $mwUser->isRegistered() ? $mwUser->getName() : null;
    }

}