feat(capabilities): Expose if mod-rewrite is working via capabilities

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

core/openapi.json

@@ -98,7 +98,8 @@
                             "pollinterval",
                             "webdav-root",
                             "reference-api",
-                            "reference-regex"
+                            "reference-regex",
+                            "mod-rewrite-working"
                         ],
                         "properties": {
                             "pollinterval": {
@@ -113,6 +114,9 @@
                             },
                             "reference-regex": {
                                 "type": "string"
+                            },
+                            "mod-rewrite-working": {
+                                "type": "boolean"
                             }
                         }
                     }

lib/private/OCS/CoreCapabilities.php

@@ -49,6 +49,7 @@ class CoreCapabilities implements ICapability {
 	 *         webdav-root: string,
 	 *         reference-api: boolean,
 	 *         reference-regex: string,
+	 *         mod-rewrite-working: boolean,
 	 *     },
 	 * }
 	 */
@@ -59,6 +60,7 @@ class CoreCapabilities implements ICapability {
 				'webdav-root' => $this->config->getSystemValueString('webdav-root', 'remote.php/webdav'),
 				'reference-api' => true,
 				'reference-regex' => IURLGenerator::URL_REGEX_NO_MODIFIERS,
+				'mod-rewrite-working' => $this->config->getSystemValueBool('htaccess.IgnoreFrontController') || getenv('front_controller_active') === 'true',
 			],
 		];
 	}