From 8ecaced6fc3f1b92f01ec99ffae06ebc67c30b4b Mon Sep 17 00:00:00 2001
From: Marcel Werk <burntime@woltlab.com>
Date: Thu, 25 Feb 2021 14:02:04 +0100
Subject: [PATCH] Default languages (de/en) can no longer be deleted

Closes #3969
---
 .../install/files/acp/templates/languageList.tpl   |  2 +-
 .../files/lib/data/language/Language.class.php     | 10 ++++++++++
 .../lib/data/language/LanguageAction.class.php     | 14 ++++++++++++++
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/wcfsetup/install/files/acp/templates/languageList.tpl b/wcfsetup/install/files/acp/templates/languageList.tpl
index 82edbb9963..9df2e9a218 100644
--- a/wcfsetup/install/files/acp/templates/languageList.tpl
+++ b/wcfsetup/install/files/acp/templates/languageList.tpl
@@ -68,7 +68,7 @@
 							
 							<a href="{link controller='LanguageEdit' id=$language->languageID}{/link}" title="{lang}wcf.global.button.edit{/lang}" class="jsTooltip"><span class="icon icon16 fa-pencil"></span></a>
 							
-							{if !$language->isDefault}
+							{if $language->isDeletable()}
 								<span class="icon icon16 fa-times jsTooltip jsDeleteButton pointer" title="{lang}wcf.global.button.delete{/lang}" data-object-id="{@$language->languageID}" data-confirm-message-html="{lang __encode=true}wcf.acp.language.delete.sure{/lang}"></span>
 							{else}
 								<span class="icon icon16 fa-times disabled" title="{lang}wcf.global.button.delete{/lang}"></span>
diff --git a/wcfsetup/install/files/lib/data/language/Language.class.php b/wcfsetup/install/files/lib/data/language/Language.class.php
index 2020ee92d8..e0a5a16c2a 100644
--- a/wcfsetup/install/files/lib/data/language/Language.class.php
+++ b/wcfsetup/install/files/lib/data/language/Language.class.php
@@ -295,4 +295,14 @@ class Language extends DatabaseObject
     {
         $this->packageID = PACKAGE_ID;
     }
+
+    /**
+     * Returns true if this language can be deleted.
+     *
+     * @since   5.4
+     */
+    public function isDeletable(): bool
+    {
+        return !$this->isDefault && $this->languageCode !== 'de' && $this->languageCode !== 'en';
+    }
 }
diff --git a/wcfsetup/install/files/lib/data/language/LanguageAction.class.php b/wcfsetup/install/files/lib/data/language/LanguageAction.class.php
index 9673f9bd40..b589b2fce6 100644
--- a/wcfsetup/install/files/lib/data/language/LanguageAction.class.php
+++ b/wcfsetup/install/files/lib/data/language/LanguageAction.class.php
@@ -90,4 +90,18 @@ class LanguageAction extends AbstractDatabaseObjectAction implements IToggleActi
             }
         }
     }
+
+    /**
+     * @inheritDoc
+     */
+    public function validateDelete()
+    {
+        parent::validateDelete();
+
+        foreach ($this->getObjects() as $language) {
+            if (!$language->isDeletable()) {
+                throw new UserInputException('objectIDs');
+            }
+        }
+    }
 }
-- 
2.20.1