fix #876

developer_manual/app/controllers.rst

@@ -526,6 +526,59 @@ If you want to use a custom, lazily rendered response simply implement the inter
 
 .. note:: Because this code is rendered after several usually built in helpers, you need to take care of errors and proper HTTP caching by yourself.
 
+Modifying the Content Securicy Policy
+-------------------------------------
+.. versionadded:: 8.1
+
+By default ownCloud disables all resources which are not served on the same domain, forbids cross domain requests and disables inline CSS and JavaScript by setting a `Content Security Policy <https://developer.mozilla.org/en-US/docs/Web/Security/CSP/Introducing_Content_Security_Policy>`_. However if an app relies on thirdparty media or other features which are forbidden by the current policy the policy can be relaxed.
+
+.. note:: Double check your content and edge cases before you relax the policy! Also read the `documentation provided by MDN <https://developer.mozilla.org/en-US/docs/Web/Security/CSP/Introducing_Content_Security_Policy>`_
+
+To relax the policy pass an instance of the ContentSecurityPolicy class to your response. The methods on the class can be chained.
+
+The following methods turn off security features by passing in **true** as the **$isAllowed** parameter
+
+* **allowInlineScript** (bool $isAllowed)
+* **allowInlineStyle** (bool $isAllowed)
+* **allowEvalScript** (bool $isAllowed)
+
+The following methods whitelist domains by passing in a domain or \* for any domain:
+
+* **addAllowedScriptDomain** (string $domain)
+* **addAllowedStyleDomain** (string $domain)
+* **addAllowedFontDomain** (string $domain)
+* **addAllowedImageDomain** (string $domain)
+* **addAllowedConnectDomain** (string $domain)
+* **addAllowedMediaDomain** (string $domain)
+* **addAllowedObjectDomain** (string $domain)
+* **addAllowedFrameDomain** (string $domain)
+* **addAllowedChildSrcDomain** (string $domain)
+
+The following policy for instance allows images, audio and videos from other domains:
+
+
+.. code-block:: php
+
+    <?php
+    namespace OCA\MyApp\Controller;
+
+    use OCP\AppFramework\Controller;
+    use OCP\AppFramework\Http\TemplateResponse;
+    use OCP\AppFramework\Http\ContentSecurityPolicy;
+
+    class PageController extends Controller {
+
+        public function index() {
+            $response = new TemplateResponse('myapp', 'main');
+            $csp = new ContentSecurityPolicy();
+            $csp->addAllowedImageDomain('*');
+                ->addAllowedMediaDomain('*');
+            $response->setContentSecurityPolicy($csp);
+        }
+
+    }
+
+
 OCS
 ---
 .. versionadded:: 8.1