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<?php |
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namespace DorsetDigital\CDNRewrite; |
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use SilverStripe\Admin\AdminRootController; |
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use SilverStripe\Control\Director; |
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use SilverStripe\Control\HTTPRequest; |
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use SilverStripe\Control\Middleware\HTTPMiddleware; |
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use SilverStripe\Core\Config\Configurable; |
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use SilverStripe\Core\Injector\Injectable; |
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use SilverStripe\View\HTML; |
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class CDNMiddleware implements HTTPMiddleware |
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{ |
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use Injectable; |
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use Configurable; |
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/** |
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* @config |
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* |
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* Enable rewriting |
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* @var bool |
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*/ |
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private static $cdn_rewrite = false; |
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/** |
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* @config |
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* |
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* The cdn domain incl. protocol |
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* @var string |
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*/ |
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private static $cdn_domain = ''; |
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/** |
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* @config |
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* |
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* Enable rewrite in dev mode |
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* @var bool |
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*/ |
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private static $enable_in_dev = false; |
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/** |
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* @config |
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* |
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* Add debug headers for each operation |
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* @var bool |
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*/ |
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private static $add_debug_headers = false; |
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/** |
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* @config |
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* |
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* Subdirectory name for the site |
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* @var string |
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*/ |
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private static $subdirectory = ''; |
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/** |
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* @config |
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* |
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* Add dns-prefetch links to the html head |
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* @var boolean |
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*/ |
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private static $add_prefetch = false; |
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/** |
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* @config |
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* |
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* Array of prefixes we wish to rewrite |
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* @var array |
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*/ |
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private static $rewrites = []; |
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/** |
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* Process the request |
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* @param HTTPRequest $request |
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* @param $delegate |
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* @return |
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*/ |
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public function process(HTTPRequest $request, callable $delegate) |
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{ |
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$response = $delegate($request); |
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if (($this->canRun() === true) && ($response !== null)) { |
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$response->addHeader('X-CDN-Rewrites', 'Enabled'); |
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if ($this->getIsAdmin($request) === false) { |
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$body = $response->getBody(); |
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$this->rewriteTags($body, $response); |
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$this->addPrefetch($body, $response); |
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$response->setBody($body); |
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} |
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if ($this->config()->get('add_debug_headers') == true) { |
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$response->addHeader('X-CDN-Domain', $this->config()->get('cdn_domain')); |
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$response->addHeader('X-CDN-Dir', $this->getSubdirectory()); |
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} |
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if ($this->config()->get('cdn_rewrite') === true) { |
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$response->addHeader('X-CDN-Module', 'Active'); |
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} |
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} |
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return $response; |
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} |
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/** |
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* Check if we're OK to execute |
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* @return bool |
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*/ |
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private function canRun() |
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{ |
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$confEnabled = $this->config()->get('cdn_rewrite'); |
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$devEnabled = ((!Director::isDev()) || ($this->config()->get('enable_in_dev'))); |
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return ($confEnabled && $devEnabled); |
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} |
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/** |
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* Rewrite all the tags we need |
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* @param $body |
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* @param $response |
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*/ |
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private function rewriteTags(&$body, &$response) |
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{ |
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$cdn = $this->config()->get('cdn_domain'); |
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$subDir = $this->getSubdirectory(); |
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$prefixes = $this->config()->get('rewrites'); |
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foreach ($prefixes as $prefix) { |
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$cleanPrefix = trim($prefix, '/'); |
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$search = [ |
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'src="' . $subDir . $cleanPrefix . '/', |
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'src="/' . $subDir . $cleanPrefix . '/', |
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'src=\"/' . $subDir . $cleanPrefix . '/', |
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'href="/' . $subDir . $cleanPrefix . '/', |
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Director::absoluteBaseURL() . $cleanPrefix . '/' |
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]; |
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$replace = [ |
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'src="' . $cdn . '/' . $subDir . $cleanPrefix . '/', |
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'src="' . $cdn . '/' . $subDir . $cleanPrefix . '/', |
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'src=\"' . $cdn . '/' . $subDir . $cleanPrefix . '/', |
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'href="' . $cdn . '/' . $subDir . $cleanPrefix . '/', |
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$cdn . '/' . $subDir . $cleanPrefix . '/' |
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]; |
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$body = str_replace($search, $replace, $body); |
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} |
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} |
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private function addPrefetch(&$body, &$response) |
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{ |
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if ($this->config()->get('add_prefetch') === true) { |
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$prefetchTag = $this->getPrefetchTag(); |
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$body = str_replace('<head>', "<head>" . $prefetchTag, $body); |
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if ($this->config()->get('add_debug_headers') == true) { |
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$response->addHeader('X-CDN-Prefetch', 'Enabled'); |
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} |
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} |
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} |
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private function getSubdirectory() |
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{ |
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$subDir = trim($this->config()->get('subdirectory'), '/'); |
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if ($subDir != "") { |
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$subDir = $subDir . '/'; |
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} |
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return $subDir; |
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} |
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private function getPrefetchTag() |
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{ |
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$atts = [ |
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'rel' => 'dns-prefetch', |
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'href' => $this->config()->get('cdn_domain') |
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]; |
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$pfTag = "\n" . HTML::createTag('link', $atts); |
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return $pfTag; |
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} |
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/** |
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* Determine whether the website is being viewed from an admin protected area or not |
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* (shamelessly based on https://github.com/silverstripe/silverstripe-subsites) |
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* |
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* @param HTTPRequest $request |
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* @return bool |
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*/ |
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private function getIsAdmin(HTTPRequest $request) |
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{ |
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$adminPath = AdminRootController::admin_url(); |
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$currentPath = rtrim($request->getURL(), '/') . '/'; |
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if (substr($currentPath, 0, strlen($adminPath)) === $adminPath) { |
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return true; |
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} |
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return false; |
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} |
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} |
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DorsetDigital /
silverstripe-cdnrewrite
This check looks for parameters that have been defined for a function or method, but which are not used in the method body.