fix: Also expose forbidden filename character in the capabilities

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

apps/files/lib/Capabilities.php

@@ -39,13 +39,14 @@ class Capabilities implements ICapability {
 	/**
 	 * Return this classes capabilities
 	 *
-	 * @return array{files: array{bigfilechunking: bool, blacklisted_files: array<mixed>}}
+	 * @return array{files: array{bigfilechunking: bool, blacklisted_files: array<mixed>, forbidden_filename_characters: array<string>}}
 	 */
 	public function getCapabilities() {
 		return [
 			'files' => [
 				'bigfilechunking' => true,
-				'blacklisted_files' => (array)$this->config->getSystemValue('blacklisted_files', ['.htaccess'])
+				'blacklisted_files' => (array)$this->config->getSystemValue('blacklisted_files', ['.htaccess']),
+				'forbidden_filename_characters' => \OCP\Util::getForbiddenFileNameChars(),
 			],
 		];
 	}

apps/files/openapi.json

@@ -31,6 +31,7 @@
                         "required": [
                             "bigfilechunking",
                             "blacklisted_files",
+                            "forbidden_filename_characters",
                             "directEditing"
                         ],
                         "properties": {
@@ -43,6 +44,12 @@
                                     "type": "object"
                                 }
                             },
+                            "forbidden_filename_characters": {
+                                "type": "array",
+                                "items": {
+                                    "type": "string"
+                                }
+                            },
                             "directEditing": {
                                 "type": "object",
                                 "required": [

config/config.sample.php

@@ -1962,6 +1962,8 @@ $CONFIG = [
 /**
  * Blacklist characters from being used in filenames. This is useful if you
  * have a filesystem or OS which does not support certain characters like windows.
+ * 
+ * The '/' and '\' characters are always forbidden.
  *
  * Example for windows systems: ``array('?', '<', '>', ':', '*', '|', '"', chr(0), "\n", "\r")``
  * see https://en.wikipedia.org/wiki/Comparison_of_file_systems#Limits

lib/public/Util.php

@@ -51,6 +51,7 @@ use OC\AppScriptDependency;
 use OC\AppScriptSort;
 use OCP\Share\IManager;
 use Psr\Container\ContainerExceptionInterface;
+use Psr\Log\LoggerInterface;
 
 /**
  * This class provides different helper functions to make the life of a developer easier
@@ -533,9 +534,9 @@ class Util {
 		}
 
 		// Get admin defined invalid characters
-		$additionalChars = \OC::$server->getConfig()->getSystemValue('forbidden_chars', []);
+		$additionalChars = \OCP\Server::get(IConfig::class)->getSystemValue('forbidden_chars', []);
 		if (!is_array($additionalChars)) {
-			\OC::$server->getLogger()->error('Invalid system config value for "forbidden_chars" is ignored.');
+			\OCP\Server::get(LoggerInterface::class)->error('Invalid system config value for "forbidden_chars" is ignored.');
 			$additionalChars = [];
 		}
 		return array_merge($invalidChars, $additionalChars);