Add a capability

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

docs/capabilities.md

@@ -64,3 +64,6 @@ title: Capabilities
 * `room-description` - A description can be get and set for conversations.
 * `config => chat => read-privacy` - See `chat-read-status`
 * `config => previews => max-gif-size` - Maximum size in bytes below which a GIF can be embedded directly in the page at render time. Bigger files will be rendered statically using the preview endpoint instead. Can be set with `occ config:app:set spreed max-gif-size --value=X` where X is the new value in bytes. Defaults to 3 MB.
+
+## 12.0
+* `delete-messages` - Allows to delete chat messages up to 6 hours for your own messages or when being a moderator. On deleting the message text will be replaced and a follow up system message will make sure clients and users update it in their cache and storage.

lib/Capabilities.php

@@ -68,6 +68,7 @@ class Capabilities implements IPublicCapability {
 				'last-room-activity',
 				'no-ping',
 				'system-messages',
+				'delete-messages',
 				'mention-flag',
 				'in-call-flags',
 				'notification-levels',

tests/php/CapabilitiesTest.php

@@ -65,6 +65,7 @@ class CapabilitiesTest extends TestCase {
 			'last-room-activity',
 			'no-ping',
 			'system-messages',
+			'delete-messages',
 			'mention-flag',
 			'in-call-flags',
 			'notification-levels',