1 files changed, 72 insertions, 0 deletions
diff --git a/lib/private/AppFramework/Middleware/CompressionMiddleware.php b/lib/private/AppFramework/Middleware/CompressionMiddleware.php
new file mode 100644
index 00000000000..8bc56beb62e
--- /dev/null
+++ b/lib/private/AppFramework/Middleware/CompressionMiddleware.php
@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OC\AppFramework\Middleware;
+
+use OC\AppFramework\OCS\BaseResponse;
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\JSONResponse;
+use OCP\AppFramework\Http\Response;
+use OCP\AppFramework\Http\TemplateResponse;
+use OCP\AppFramework\Middleware;
+use OCP\IRequest;
+
+class CompressionMiddleware extends Middleware {
+	/** @var bool */
+	private $useGZip;
+
+	/** @var IRequest */
+	private $request;
+
+	public function __construct(IRequest $request) {
+		$this->request = $request;
+		$this->useGZip = false;
+	}
+
+	public function afterController($controller, $methodName, Response $response) {
+		// By default we do not gzip
+		$allowGzip = false;
+
+		// Only return gzipped content for 200 responses
+		if ($response->getStatus() !== Http::STATUS_OK) {
+			return $response;
+		}
+
+		// Check if we are even asked for gzip
+		$header = $this->request->getHeader('Accept-Encoding');
+		if (!str_contains($header, 'gzip')) {
+			return $response;
+		}
+
+		// We only allow gzip in some cases
+		if ($response instanceof BaseResponse) {
+			$allowGzip = true;
+		}
+		if ($response instanceof JSONResponse) {
+			$allowGzip = true;
+		}
+		if ($response instanceof TemplateResponse) {
+			$allowGzip = true;
+		}
+
+		if ($allowGzip) {
+			$this->useGZip = true;
+			$response->addHeader('Content-Encoding', 'gzip');
+		}
+
+		return $response;
+	}
+
+	public function beforeOutput($controller, $methodName, $output) {
+		if (!$this->useGZip) {
+			return $output;
+		}
+
+		return gzencode($output);
+	}
+}