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[mediawiki.git] / includes / specials / SpecialJavaScriptTest.php

<?php
/**
 * Implements Special:JavaScriptTest
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup SpecialPage
 */

/**
 * @ingroup SpecialPage
 */
class SpecialJavaScriptTest extends SpecialPage {

        public function __construct() {
                parent::__construct( 'JavaScriptTest' );
        }

        public function execute( $par ) {
                $out = $this->getOutput();

                $this->setHeaders();
                $out->disallowUserJs();

                // This special page is disabled by default ($wgEnableJavaScriptTest), and contains
                // no sensitive data. In order to allow TestSwarm to embed it into a test client window,
                // we need to allow iframing of this page.
                $out->allowClickjacking();

                // Sub resource: Internal JavaScript export bundle for QUnit
                if ( $par === 'qunit/export' ) {
                        $this->exportQUnit();
                        return;
                }

                // Regular view: QUnit test runner
                // (Support "/qunit" and "/qunit/plain" for backwards compatibility)
                if ( $par === null || $par === '' || $par === 'qunit' || $par === 'qunit/plain' ) {
                        $this->plainQUnit();
                        return;
                }

                // Unknown action
                $out->setStatusCode( 404 );
                $out->setPageTitle( $this->msg( 'javascripttest' ) );
                $out->addHTML(
                        '<div class="error">'
                        . $this->msg( 'javascripttest-pagetext-unknownaction' )
                                ->plaintextParams( $par )->parseAsBlock()
                        . '</div>'
                );
        }

        /**
         * Get summary text wrapped in a container
         *
         * @return string HTML
         */
        private function getSummaryHtml() {
                $summary = $this->msg( 'javascripttest-qunit-intro' )
                        ->params( 'https://www.mediawiki.org/wiki/Manual:JavaScript_unit_testing' )
                        ->parseAsBlock();
                return "<div id=\"mw-javascripttest-summary\">$summary</div>";
        }

        /**
         * Generate self-sufficient JavaScript payload to run the tests elsewhere.
         *
         * Includes startup module to request modules from ResourceLoader.
         *
         * Note: This modifies the registry to replace 'jquery.qunit' with an
         * empty module to allow external environment to preload QUnit with any
         * neccecary framework adapters (e.g. Karma). Loading it again would
         * re-define QUnit and dereference event handlers from Karma.
         */
        private function exportQUnit() {
                $out = $this->getOutput();
                $out->disable();

                $rl = $out->getResourceLoader();

                $query = [
                        'lang' => $this->getLanguage()->getCode(),
                        'skin' => $this->getSkin()->getSkinName(),
                        'debug' => ResourceLoader::inDebugMode() ? 'true' : 'false',
                        'target' => 'test',
                ];
                $embedContext = new ResourceLoaderContext( $rl, new FauxRequest( $query ) );
                $query['only'] = 'scripts';
                $startupContext = new ResourceLoaderContext( $rl, new FauxRequest( $query ) );

                $query['raw'] = true;

                $modules = $rl->getTestModuleNames( 'qunit' );

                // Disable autostart because we load modules asynchronously. By default, QUnit would start
                // at domready when there are no tests loaded and also fire 'QUnit.done' which then instructs
                // Karma to end the run before the tests even started.
                $qunitConfig = 'QUnit.config.autostart = false;'
                        . 'if (window.__karma__) {'
                        // karma-qunit's use of autostart=false and QUnit.start conflicts with ours.
                        // Hack around this by replacing 'karma.loaded' with a no-op and call it ourselves later.
                        // See <https://github.com/karma-runner/karma-qunit/issues/27>.
                        . 'window.__karma__.loaded = function () {};'
                        . '}';

                // The below is essentially a pure-javascript version of OutputPage::headElement().
                $startup = $rl->makeModuleResponse( $startupContext, [
                        'startup' => $rl->getModule( 'startup' ),
                ] );
                // Embed page-specific mw.config variables.
                // The current Special page shouldn't be relevant to tests, but various modules (which
                // are loaded before the test suites), reference mw.config while initialising.
                $code = ResourceLoader::makeConfigSetScript( $out->getJSVars() );
                // Embed private modules as they're not allowed to be loaded dynamically
                $code .= $rl->makeModuleResponse( $embedContext, [
                        'user.options' => $rl->getModule( 'user.options' ),
                        'user.tokens' => $rl->getModule( 'user.tokens' ),
                ] );
                // Catch exceptions (such as "dependency missing" or "unknown module") so that we
                // always start QUnit. Re-throw so that they are caught and reported as global exceptions
                // by QUnit and Karma.
                $code .= '(function () {'
                        . 'var start = window.__karma__ ? window.__karma__.start : QUnit.start;'
                        . 'try {'
                        . 'mw.loader.using( ' . Xml::encodeJsVar( $modules ) . ' )'
                        . '.always( start )'
                        . '.fail( function ( e ) { throw e; } );'
                        . '} catch ( e ) { start(); throw e; }'
                        . '}());';

                header( 'Content-Type: text/javascript; charset=utf-8' );
                header( 'Cache-Control: private, no-cache, must-revalidate' );
                header( 'Pragma: no-cache' );
                echo $qunitConfig;
                echo $startup;
                // The following has to be deferred via RLQ because the startup module is asynchronous.
                echo ResourceLoader::makeLoaderConditionalScript( $code );
        }

        private function plainQUnit() {
                $out = $this->getOutput();
                $out->disable();

                $styles = $out->makeResourceLoaderLink( 'jquery.qunit',
                        ResourceLoaderModule::TYPE_STYLES
                );

                // Use 'raw' because QUnit loads before ResourceLoader initialises (omit mw.loader.state call)
                // Use 'test' to ensure OutputPage doesn't use the "async" attribute because QUnit must
                // load before qunit/export.
                $scripts = $out->makeResourceLoaderLink( 'jquery.qunit',
                        ResourceLoaderModule::TYPE_SCRIPTS,
                        [ 'raw' => true, 'sync' => true ]
                );

                $head = implode( "\n", [ $styles, $scripts ] );
                $summary = $this->getSummaryHtml();
                $html = <<<HTML
<!DOCTYPE html>
<title>QUnit</title>
$head
$summary
<div id="qunit"></div>
HTML;

                $url = $this->getPageTitle( 'qunit/export' )->getFullURL( [
                        'debug' => ResourceLoader::inDebugMode() ? 'true' : 'false',
                ] );
                $html .= "\n" . Html::linkedScript( $url );

                header( 'Content-Type: text/html; charset=utf-8' );
                echo $html;
        }

        /**
         * Return an array of subpages that this special page will accept.
         *
         * @return string[] subpages
         */
        public function getSubpagesForPrefixSearch() {
                return self::$frameworks;
        }

        protected function getGroupName() {
                return 'other';
        }
}