Initial commit

.gitattributes

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+/.gitattributes export-ignore
+/.gitignore export-ignore
+/.travis.yml export-ignore
+/phpunit.xml.dist export-ignore
+/Tests export-ignore

.gitignore

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+Build
+composer.lock
+vendor
+public
+.phpunit.result.cache

Classes/PageRendererHook.php

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+<?php
+declare(strict_types = 1);
+namespace B13\Http2;
+
+/*
+ * This file is part of TYPO3 CMS-based extension "http2" by b13.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ */
+
+use TYPO3\CMS\Core\Page\PageRenderer;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+use TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;
+
+/**
+ * Hooks into PageRenderer before the rendering is taken care of, and remember the files
+ * that can be sent as resources.
+ *
+ * This considers that everything is required, thus is marked as "preload", not via "prefetch".
+ */
+class PageRendererHook
+{
+    /**
+     * @var ResourceMatcher
+     */
+    protected $matcher;
+
+    /**
+     * @param ResourceMatcher|null $matcher
+     */
+    public function __construct(ResourceMatcher $matcher = null)
+    {
+        $this->matcher = $matcher ?: GeneralUtility::makeInstance(ResourceMatcher::class);
+    }
+
+    /**
+     * @param array $params
+     * @param PageRenderer $pageRenderer
+     * @internal this is just a hook implementation.
+     */
+    public function accumulateResources(array $params, PageRenderer $pageRenderer)
+    {
+        // If this is a second run (non-cached cObjects adding more data), then the existing cached data is fetched
+        if ($this->getTypoScriptFrontendController() instanceof TypoScriptFrontendController) {
+            $allResources = $this->getTypoScriptFrontendController()->config['b13/http2'] ?? [];
+        } else {
+            $allResources = [];
+        }
+        foreach ($params['headerData'] as $headerData) {
+            $allResources = array_merge_recursive($allResources, $this->matcher->match($headerData));
+        }
+        foreach ($params['footerData'] as $footerData) {
+            $allResources = array_merge_recursive($allResources, $this->matcher->match($footerData));
+        }
+        $allResources = array_merge_recursive($allResources, $this->matcher->match($params['jsLibs']));
+        $allResources = array_merge_recursive($allResources, $this->matcher->match($params['jsFiles']));
+        $allResources = array_merge_recursive($allResources, $this->matcher->match($params['jsFooterLibs']));
+        $allResources = array_merge_recursive($allResources, $this->matcher->match($params['jsFooterFiles']));
+        $allResources = array_merge_recursive($allResources, $this->matcher->match($params['cssLibs']));
+        $allResources = array_merge_recursive($allResources, $this->matcher->match($params['cssFiles']));
+
+        $allResources['scripts'] = array_unique($allResources['scripts']);
+        $allResources['styles'] = array_unique($allResources['styles']);
+
+        $this->process($allResources);
+    }
+
+    /**
+     * In FE the data is stored in TSFE->config.
+     * In BE it is sent directly to the HTTP response.
+     *
+     * @param array $allResources
+     */
+    protected function process(array $allResources)
+    {
+        if ($this->getTypoScriptFrontendController() instanceof TypoScriptFrontendController) {
+            $this->getTypoScriptFrontendController()->config['b13/http2'] = $allResources;
+        } elseif (GeneralUtility::getIndpEnv('TYPO3_SSL')) {
+            // Push directly into the TYPO3 Backend, but only if TYPO3 is running in SSL
+            GeneralUtility::makeInstance(ResourcePusher::class)->pushAll($allResources);
+        }
+    }
+
+    protected function getTypoScriptFrontendController()
+    {
+        return $GLOBALS['TSFE'];
+    }
+}

Classes/ResourceMatcher.php

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+<?php
+declare(strict_types = 1);
+namespace B13\Http2;
+
+/*
+ * This file is part of TYPO3 CMS-based extension "http2" by b13.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ */
+
+/**
+ * Parses a string by detecting <script> and <link> tags.
+ */
+class ResourceMatcher
+{
+    protected $resourcePattern = '[\'"]?([\w\s\/\-:?.]*)["\']?';
+
+    /**
+     * @param string $input
+     * @return array
+     */
+    public function match(string $input): array
+    {
+        if (empty($input)) {
+            return ['scripts' => [], 'styles' => []];
+        }
+        $matches = [];
+        preg_match_all(
+            '/<script[\/\s\w-="]*src=' . $this->resourcePattern . '[^>]*>'
+            . '|' .
+            '<link[\/\s\w-="]*href=' . $this->resourcePattern . '[^>]*>'
+            . '/ui',
+            $input,
+            $matches
+        );
+
+        // simple check - should be optimized to include further checks
+        $styles = array_filter($matches[2], function ($resource) {
+            return strpos($resource, '.css') !== false;
+        });
+
+        return [
+            'scripts' => array_values(array_filter($matches[1])),
+            'styles' => array_values($styles)
+        ];
+    }
+}

Classes/ResourcePusher.php

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+<?php
+declare(strict_types = 1);
+namespace B13\Http2;
+
+/*
+ * This file is part of TYPO3 CMS-based extension "http2" by b13.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ */
+
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+use TYPO3\CMS\Core\Utility\PathUtility;
+use TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;
+
+/**
+ * Takes existing accumulated resources and pushes them as HTTP2 <link> headers.
+ *
+ * This considers that everything is required, thus is marked as "preload", not via "prefetch".
+ *
+ * Also, it only tackles "script", "style", but we should incorporate font as well.
+ * See https://w3c.github.io/preload/#as-attribute
+ */
+class ResourcePusher
+{
+    /**
+     * @param array $resources
+     */
+    public function pushAll(array $resources)
+    {
+        foreach ($resources['scripts'] as $resource) {
+            $this->addPreloadHeader($resource, 'script');
+        }
+        foreach ($resources['styles'] as $resource) {
+            $this->addPreloadHeader($resource, 'style');
+        }
+    }
+
+    /**
+     * @param array $params
+     * @param TypoScriptFrontendController $typoScriptFrontendController
+     * @internal this is just a hook implementation.
+     */
+    public function pushForFrontend(array $params, TypoScriptFrontendController $typoScriptFrontendController)
+    {
+        $allResources = $typoScriptFrontendController->config['b13/http2'];
+        if (GeneralUtility::getIndpEnv('TYPO3_SSL') && is_array($allResources)) {
+            $this->pushAll($allResources);
+        }
+    }
+
+    /**
+     * as="{style/script/image}"
+     *
+     * @param string $uri
+     * @param string $type
+     */
+    protected function addPreloadHeader(string $uri, string $type)
+    {
+        header('Link: <' . htmlspecialchars(PathUtility::getAbsoluteWebPath($uri)) . '>; rel=preload; as=' . $type, false);
+    }
+}