Fix robots "noindex, nofollow" signals

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/public/AppFramework/Http/Response.php

@@ -239,6 +239,7 @@ class Response {
 
 		$this->headers['Content-Security-Policy'] = $this->getContentSecurityPolicy()->buildPolicy();
 		$this->headers['Feature-Policy'] = $this->getFeaturePolicy()->buildPolicy();
+		$this->headers['X-Robots-Tag'] = 'none';
 
 		if ($this->ETag) {
 			$mergeWith['ETag'] = '"' . $this->ETag . '"';

lib/public/AppFramework/Http/TemplateResponse.php

@@ -157,6 +157,7 @@ class TemplateResponse extends Response {
 		// \OCP\Template needs an empty string instead of 'blank' for an unwrapped response
 		$renderAs = $this->renderAs === 'blank' ? '' : $this->renderAs;
 
+		\OCP\Util::addHeader('meta', ['name' => 'robots', 'content' => 'noindex, nofollow']);
 		$template = new \OCP\Template($this->appName, $this->templateName, $renderAs);
 
 		foreach ($this->params as $key => $value) {

tests/lib/AppFramework/Controller/ControllerTest.php

@@ -92,7 +92,7 @@ class ControllerTest extends \Test\TestCase {
 		$this->controller = new ChildController($this->app, $request);
 	}
 
-	
+
 	public function testFormatResonseInvalidFormat() {
 		$this->expectException(\DomainException::class);
 
@@ -114,6 +114,7 @@ class ControllerTest extends \Test\TestCase {
 			'Content-Type' => 'application/json; charset=utf-8',
 			'Content-Security-Policy' => "default-src 'none';base-uri 'none';manifest-src 'self'",
 			'Feature-Policy' => "autoplay 'none';camera 'none';fullscreen 'none';geolocation 'none';microphone 'none';payment 'none'",
+			'X-Robots-Tag' => 'none',
 		];
 
 		$response = $this->controller->customDataResponse(['hi']);

tests/lib/AppFramework/Http/DataResponseTest.php

@@ -67,6 +67,7 @@ class DataResponseTest extends \Test\TestCase {
 			'Cache-Control' => 'no-cache, no-store, must-revalidate',
 			'Content-Security-Policy' => "default-src 'none';base-uri 'none';manifest-src 'self'",
 			'Feature-Policy' => "autoplay 'none';camera 'none';fullscreen 'none';geolocation 'none';microphone 'none';payment 'none'",
+			'X-Robots-Tag' => 'none',
 		];
 		$expectedHeaders = array_merge($expectedHeaders, $headers);
 

tests/lib/AppFramework/Http/ResponseTest.php

@@ -51,7 +51,8 @@ class ResponseTest extends \Test\TestCase {
 		$expected = [
 			'Last-Modified' => 1,
 			'ETag' => 3,
-			'Something-Else' => 'hi'
+			'Something-Else' => 'hi',
+			'X-Robots-Tag' => 'none',
 		];
 
 		$this->childResponse->setHeaders($expected);
@@ -90,7 +91,7 @@ class ResponseTest extends \Test\TestCase {
 	public function testAddHeaderValueNullDeletesIt() {
 		$this->childResponse->addHeader('hello', 'world');
 		$this->childResponse->addHeader('hello', null);
-		$this->assertEquals(3, count($this->childResponse->getHeaders()));
+		$this->assertEquals(4, count($this->childResponse->getHeaders()));
 	}