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<?php |
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namespace LeKoala\DeferBackend; |
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use Exception; |
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use SilverStripe\View\HTML; |
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use InvalidArgumentException; |
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use SilverStripe\View\SSViewer; |
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use SilverStripe\View\Requirements; |
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use SilverStripe\View\ThemeResourceLoader; |
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use SilverStripe\View\Requirements_Backend; |
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/** |
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* A backend that defers everything by default |
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* |
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* Also insert custom head tags first because order may matter |
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* |
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* @link https://flaviocopes.com/javascript-async-defer/ |
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*/ |
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class DeferBackend extends Requirements_Backend |
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{ |
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// It's better to write to the head with defer |
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public $writeJavascriptToBody = false; |
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/** |
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* @return $this |
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*/ |
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public static function getDeferBackend() |
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{ |
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$backend = Requirements::backend(); |
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if (!$backend instanceof self) { |
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throw new Exception("Requirements backend is currently of class " . get_class($backend)); |
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} |
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return $backend; |
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} |
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/** |
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* @param Requirements_Backend $oldBackend defaults to current backend |
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* @return $this |
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*/ |
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public static function replaceBackend(Requirements_Backend $oldBackend = null) |
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{ |
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if ($oldBackend === null) { |
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$oldBackend = Requirements::backend(); |
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} |
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$deferBackend = new static; |
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foreach ($oldBackend->getCSS() as $file => $opts) { |
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$deferBackend->css($file, null, $opts); |
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} |
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foreach ($oldBackend->getJavascript() as $file => $opts) { |
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$deferBackend->javascript($file, null, $opts); |
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} |
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foreach ($oldBackend->getCustomCSS() as $id => $script) { |
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$deferBackend->customCSS($script, $id); |
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} |
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foreach ($oldBackend->getCustomScripts() as $id => $script) { |
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$deferBackend->customScript($script, $id); |
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} |
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Requirements::set_backend($deferBackend); |
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return $deferBackend; |
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} |
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/** |
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* @return array |
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*/ |
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public static function listCookieTypes() |
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{ |
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return ['strictly-necessary', 'functionality', 'tracking', 'targeting']; |
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} |
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/** |
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* Register the given JavaScript file as required. |
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* |
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* @param string $file Either relative to docroot or in the form "vendor/package:resource" |
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* @param array $options List of options. Available options include: |
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* - 'provides' : List of scripts files included in this file |
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* - 'async' : Boolean value to set async attribute to script tag |
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* - 'defer' : Boolean value to set defer attribute to script tag (true by default) |
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* - 'type' : Override script type= value. |
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* - 'integrity' : SubResource Integrity hash |
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* - 'crossorigin' : Cross-origin policy for the resource |
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* - 'cookie-consent' : Type of cookie for conditionnal loading : strictly-necessary,functionality,tracking,targeting |
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*/ |
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public function javascript($file, $options = array()) |
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{ |
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// We want to defer by default, but we can disable it if needed |
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if (!isset($options['defer'])) { |
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$options['defer'] = true; |
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} |
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if (isset($options['cookie-consent'])) { |
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if (!in_array($options['cookie-consent'], self::listCookieTypes())) { |
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throw new InvalidArgumentException("The cookie-consent value is invalid, it must be one of: strictly-necessary,functionality,tracking,targeting"); |
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} |
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// switch to text plain for conditional loading |
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$options['type'] = 'text/plain'; |
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} |
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parent::javascript($file, $options); |
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if (isset($options['cookie-consent'])) { |
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$this->javascript[$file]['cookie-consent'] = $options['cookie-consent']; |
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} |
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} |
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/** |
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* @param string $name |
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* @param string|array $type Pass the type or an array of options |
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* @return void |
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*/ |
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public function themedJavascript($name, $type = null) |
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{ |
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$path = ThemeResourceLoader::inst()->findThemedJavascript($name, SSViewer::get_themes()); |
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if ($path) { |
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$opts = []; |
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if ($type) { |
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if (is_string($type)) { |
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$opts['type'] = $type; |
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} elseif (is_array($type)) { |
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$opts = $type; |
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} |
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} |
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$this->javascript($path, $opts); |
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} else { |
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throw new InvalidArgumentException( |
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"The javascript file doesn't exist. Please check if the file $name.js exists in any " |
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. "context or search for themedJavascript references calling this file in your templates." |
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); |
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} |
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} |
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/** |
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* Get all css files |
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* |
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* @return array |
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*/ |
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public function getCSS() |
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{ |
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$css = array_diff_key($this->css, $this->blocked); |
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// Theme and assets files should always come last to have a proper cascade |
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$allCss = []; |
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$themeCss = []; |
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foreach ($css as $file => $arr) { |
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if (strpos($file, 'themes') === 0 || strpos($file, '/assets') === 0) { |
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$themeCss[$file] = $arr; |
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} else { |
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$allCss[$file] = $arr; |
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} |
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} |
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return array_merge($allCss, $themeCss); |
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} |
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/** |
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* Update the given HTML content with the appropriate include tags for the registered |
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* requirements. Needs to receive a valid HTML/XHTML template in the $content parameter, |
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* including a head and body tag. |
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* |
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* @param string $content HTML content that has already been parsed from the $templateFile through {@link SSViewer} |
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* @return string HTML content augmented with the requirements tags |
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*/ |
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public function includeInHTML($content) |
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{ |
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// Get our CSP nonce, it's always good to have even if we don't use it :-) |
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$nonce = CspProvider::getCspNonce(); |
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// Skip if content isn't injectable, or there is nothing to inject |
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$tagsAvailable = preg_match('#</head\b#', $content); |
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$hasFiles = $this->css || $this->javascript || $this->customCSS || $this->customScript || $this->customHeadTags; |
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if (!$tagsAvailable || !$hasFiles) { |
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return $content; |
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} |
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$requirements = ''; |
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$jsRequirements = ''; |
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// Combine files - updates $this->javascript and $this->css |
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$this->processCombinedFiles(); |
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// Script tags for js links |
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foreach ($this->getJavascript() as $file => $attributes) { |
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// Build html attributes |
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$htmlAttributes = [ |
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'type' => isset($attributes['type']) ? $attributes['type'] : "application/javascript", |
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'src' => $this->pathForFile($file), |
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'nonce' => $nonce, |
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]; |
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if (!empty($attributes['async'])) { |
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$htmlAttributes['async'] = 'async'; |
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} |
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if (!empty($attributes['defer'])) { |
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$htmlAttributes['defer'] = 'defer'; |
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} |
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if (!empty($attributes['integrity'])) { |
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$htmlAttributes['integrity'] = $attributes['integrity']; |
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} |
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if (!empty($attributes['crossorigin'])) { |
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$htmlAttributes['crossorigin'] = $attributes['crossorigin']; |
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} |
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if (!empty($attributes['cookie-consent'])) { |
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$htmlAttributes['cookie-consent'] = $attributes['cookie-consent']; |
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} |
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$jsRequirements .= HTML::createTag('script', $htmlAttributes); |
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$jsRequirements .= "\n"; |
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} |
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// Add all inline JavaScript *after* including external files they might rely on |
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foreach ($this->getCustomScripts() as $scriptId => $script) { |
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if (is_numeric($scriptId)) { |
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$script = $scriptId; |
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$scriptId = null; |
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} |
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$attributes = [ |
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'type' => 'application/javascript', |
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'nonce' => $nonce, |
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]; |
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// For cookie-consent, since the Requirements API does not support passing variables |
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// we rely on last part of uniquness id |
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if ($scriptId) { |
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$parts = explode("-", $scriptId); |
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$lastPart = array_pop($parts); |
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if (in_array($lastPart, self::listCookieTypes())) { |
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$attributes['type'] = 'text/plain'; |
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$attributes['cookie-consent'] = $lastPart; |
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} |
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} |
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// Wrap script in a DOMContentLoaded |
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// Make sure we don't add the eventListener twice (this will only work for simple scripts) |
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// Make sure we don't wrap scripts concerned by security policies |
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// @link https://stackoverflow.com/questions/41394983/how-to-defer-inline-javascript |
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if (empty($attributes['cookie-consent']) && strpos($script, 'window.addEventListener') === false) { |
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$script = "window.addEventListener('DOMContentLoaded', function() { $script });"; |
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} |
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// Remove comments if any |
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$script = preg_replace('/(?:(?:\/\*(?:[^*]|(?:\*+[^*\/]))*\*+\/)|(?:(?<!\:|\\\|\'|\")\/\/.*))/', '', $script); |
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$jsRequirements .= HTML::createTag( |
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'script', |
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$attributes, |
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"//<![CDATA[\n{$script}\n//]]>" |
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); |
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$jsRequirements .= "\n"; |
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} |
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// Custom head tags (comes first) |
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foreach ($this->getCustomHeadTags() as $customHeadTag) { |
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$requirements .= "{$customHeadTag}\n"; |
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} |
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// CSS file links |
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foreach ($this->getCSS() as $file => $params) { |
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$htmlAttributes = [ |
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'rel' => 'stylesheet', |
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'type' => 'text/css', |
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'href' => $this->pathForFile($file), |
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]; |
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if (!empty($params['media'])) { |
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$htmlAttributes['media'] = $params['media']; |
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} |
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$requirements .= HTML::createTag('link', $htmlAttributes); |
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$requirements .= "\n"; |
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} |
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// Literal custom CSS content |
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foreach ($this->getCustomCSS() as $css) { |
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$requirements .= HTML::createTag('style', ['type' => 'text/css'], "\n{$css}\n"); |
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$requirements .= "\n"; |
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} |
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// Inject CSS into body |
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$content = $this->insertTagsIntoHead($requirements, $content); |
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// Inject scripts |
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if ($this->getForceJSToBottom()) { |
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$content = $this->insertScriptsAtBottom($jsRequirements, $content); |
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} elseif ($this->getWriteJavascriptToBody()) { |
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$content = $this->insertScriptsIntoBody($jsRequirements, $content); |
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} else { |
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$content = $this->insertTagsIntoHead($jsRequirements, $content); |
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} |
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return $content; |
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} |
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} |
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lekoala /
silverstripe-defer-backend
Loading history...
This check compares calls to functions or methods with their respective definitions. If the call has more arguments than are defined, it raises an issue.
If a function is defined several times with a different number of parameters, the check may pick up the wrong definition and report false positives. One codebase where this has been known to happen is Wordpress. Please note the @ignore annotation hint above.