feat(sharing): Add `shareapi_allow_custom_tokens` config

Signed-off-by: Christopher Ng <chrng8@gmail.com>

lib/private/Share20/Manager.php

@@ -21,6 +21,7 @@ use OCP\Files\Mount\IShareOwnerlessMount;
 use OCP\Files\Node;
 use OCP\Files\NotFoundException;
 use OCP\HintException;
+use OCP\IAppConfig;
 use OCP\IConfig;
 use OCP\IDateTimeZone;
 use OCP\IGroupManager;
@@ -79,6 +80,7 @@ class Manager implements IManager {
 		private KnownUserService $knownUserService,
 		private ShareDisableChecker $shareDisableChecker,
 		private IDateTimeZone $dateTimeZone,
+		private IAppConfig $appConfig,
 	) {
 		$this->l = $this->l10nFactory->get('lib');
 		// The constructor of LegacyHooks registers the listeners of share events
@@ -1906,6 +1908,10 @@ class Manager implements IManager {
 		return $this->config->getAppValue('core', 'shareapi_restrict_user_enumeration_full_match_ignore_second_dn', 'no') === 'yes';
 	}
 
+	public function allowCustomTokens(): bool {
+		return $this->appConfig->getValueBool('core', 'shareapi_allow_custom_tokens', false);
+	}
+
 	public function currentUserCanEnumerateTargetUser(?IUser $currentUser, IUser $targetUser): bool {
 		if ($this->allowEnumerationFullMatch()) {
 			return true;

lib/public/Share/IManager.php

@@ -464,6 +464,14 @@ interface IManager {
 	 */
 	public function ignoreSecondDisplayName(): bool;
 
+
+	/**
+	 * Check if custom tokens are allowed
+	 *
+	 * @since 31.0.0
+	 */
+	public function allowCustomTokens(): bool;
+
 	/**
 	 * Check if the current user can enumerate the target user
 	 *