This change allows AppFramework applications to specify a custom CSP header for example when the default policy is too strict. Furthermore this allows us to partially migrate away from CSS and allowed eval() in our JavaScript components.
Legacy ownCloud components will still use the previous policy. Application developers can use this as following in their controllers:
```php
$response = new TemplateResponse('activity', 'list', []);
$cspHelper = new ContentSecurityPolicyHelper();
$cspHelper->addAllowedScriptDomain('www.owncloud.org');
$response->addHeader('Content-Security-Policy', $cspHelper->getPolicy());
return $response;
```
Fixes https://github.com/owncloud/core/issues/11857 which is a pre-requisite for https://github.com/owncloud/core/issues/13458 and https://github.com/owncloud/core/issues/11925
Currently there is no AppFramework way to modify cookies, which makes it unusable for quite some use-cases or results in untestable code.
This PR adds some basic functionalities to add and invalidate cookies.
Usage:
```php
$response = new TemplateResponse(...);
$response->addCookie('foo', 'bar');
$response->invalidateCookie('foo');
$response->addCookie('bar', 'foo', new \DateTime('2015-01-01 00:00'));
```
Existing cookies can be accessed with the AppFramework using `$this->request->getCookie($name)`.
fix docstrings
adjust copyright date
another copyright date update
another header update
implement third headers argument, fix indention, fix docstrings
fix docstrings
remove methodannotationreader namespace
fix namespace for server container
fix tests
fail if with cors credentials header is set to true, implement a reusable preflighted cors method in the controller baseclass, make corsmiddleware private and register it for every request
remove uneeded local in cors middleware registratio
dont uppercase cors to easily use it from routes
fix indention
comment fixes
explicitely set allow credentials header to false
dont depend on better controllers PR, fix that stuff later
split cors methods to be in a seperate controller for exposing apis
remove protected definitions from apicontroller since controller has it
