From 8d707a1e5bc354345b31f4ab26bcfcf61db1c8f7 Mon Sep 17 00:00:00 2001
From: nfebe <fenn25.fn@gmail.com>
Date: Fri, 13 Feb 2026 19:32:26 +0100
Subject: [PATCH] fix(sharing): Use link_defaultExpDays for default expiration
 in web UI

The link_defaultExpDays config was only used in the backend share
validation but never exposed to the frontend, making it impossible
to set a default expiration date different from the maximum.
---
 apps/files_sharing/lib/Capabilities.php          |  8 +++++++-
 apps/files_sharing/src/services/ConfigService.ts | 16 +++++++++++++---
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/apps/files_sharing/lib/Capabilities.php b/apps/files_sharing/lib/Capabilities.php
index 7b911cb74dd..5fed5778b90 100644
--- a/apps/files_sharing/lib/Capabilities.php
+++ b/apps/files_sharing/lib/Capabilities.php
@@ -123,7 +123,13 @@ class Capabilities implements ICapability {
 				$public['multiple_links'] = true;
 				$public['expire_date']['enabled'] = $this->shareManager->shareApiLinkDefaultExpireDate();
 				if ($public['expire_date']['enabled']) {
-					$public['expire_date']['days'] = $this->shareManager->shareApiLinkDefaultExpireDays();
+					$maxDays = $this->shareManager->shareApiLinkDefaultExpireDays();
+					$defaultDays = (int)$this->config->getAppValue('core', 'link_defaultExpDays', (string)$maxDays);
+					if ($defaultDays > $maxDays) {
+						$defaultDays = $maxDays;
+					}
+					$public['expire_date']['days'] = $maxDays;
+					$public['expire_date']['default_days'] = $defaultDays;
 					$public['expire_date']['enforced'] = $this->shareManager->shareApiLinkDefaultExpireDateEnforced();
 				}
 
diff --git a/apps/files_sharing/src/services/ConfigService.ts b/apps/files_sharing/src/services/ConfigService.ts
index 7d3a24672ea..6ccc9e595c6 100644
--- a/apps/files_sharing/src/services/ConfigService.ts
+++ b/apps/files_sharing/src/services/ConfigService.ts
@@ -130,8 +130,11 @@ export default class Config {
 	 * Get the default link share expiration date
 	 */
 	get defaultExpirationDate(): Date | null {
-		if (this.isDefaultExpireDateEnabled && this.defaultExpireDate !== null) {
-			return new Date(new Date().setDate(new Date().getDate() + this.defaultExpireDate))
+		if (this.isDefaultExpireDateEnabled) {
+			const days = this.linkDefaultExpDays ?? this.defaultExpireDate
+			if (days !== null) {
+				return new Date(new Date().setDate(new Date().getDate() + days))
+			}
 		}
 		return null
 	}
@@ -243,12 +246,19 @@ export default class Config {
 	}
 
 	/**
-	 * Get the default days to link shares expiration
+	 * Get the maximum days to link shares expiration
 	 */
 	get defaultExpireDate(): number | null {
 		return window.OC.appConfig.core.defaultExpireDate
 	}
 
+	/**
+	 * Get the default days to link shares expiration
+	 */
+	get linkDefaultExpDays(): number | null {
+		return this._capabilities?.files_sharing?.public?.expire_date?.default_days ?? null
+	}
+
 	/**
 	 * Get the default days to internal shares expiration
 	 */