From 3fbdb2f345cc5fb132755033ba3b9d2fa061218e Mon Sep 17 00:00:00 2001
From: 3D-I <eataly3d@gmail.com>
Date: Tue, 13 Aug 2019 04:30:48 +0200
Subject: [PATCH] [ticket/16019] Deny prosilver's uninstallation

PHPBB3-16019
---
 phpBB/includes/acp/acp_styles.php | 12 ++++++++++++
 phpBB/language/en/acp/styles.php  |  3 ++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/phpBB/includes/acp/acp_styles.php b/phpBB/includes/acp/acp_styles.php
index 1bf5a3c6a8..1983dff1cc 100644
--- a/phpBB/includes/acp/acp_styles.php
+++ b/phpBB/includes/acp/acp_styles.php
@@ -289,6 +289,14 @@ class acp_styles
 	{
 		global $user, $phpbb_log;
 
+		// Don't remove prosilver, you can still deactivate it.
+		$sql = 'SELECT style_id
+			FROM ' . STYLES_TABLE . "
+			WHERE style_name = '" . $this->db->sql_escape('prosilver') . "'";
+		$result = $this->db->sql_query($sql);
+		$prosilver_id = (int) $this->db->sql_fetchrow($result);
+		$this->db->sql_freeresult($result);
+
 		$default = $this->default_style;
 		$uninstalled = array();
 		$messages = array();
@@ -296,6 +304,10 @@ class acp_styles
 		// Check styles list
 		foreach ($ids as $id)
 		{
+			if ($id == $prosilver_id)
+			{
+				trigger_error($this->user->lang['UNINSTALL_PROSILVER'] . adm_back_link($this->u_action), E_USER_WARNING);
+			}
 			if (!$id)
 			{
 				trigger_error($this->user->lang['INVALID_STYLE_ID'] . adm_back_link($this->u_action), E_USER_WARNING);
diff --git a/phpBB/language/en/acp/styles.php b/phpBB/language/en/acp/styles.php
index ab85d9d2f5..bfa8753a74 100644
--- a/phpBB/language/en/acp/styles.php
+++ b/phpBB/language/en/acp/styles.php
@@ -84,7 +84,8 @@ $lang = array_merge($lang, array(
 	'STYLE_USED_BY'				=> 'Used by (including robots)',
 	'STYLE_VERSION'				=> 'Style version',
 
-	'UNINSTALL_DEFAULT'		=> 'You cannot uninstall the default style.',
+	'UNINSTALL_PROSILVER'		=> 'You cannot uninstall the style “prosilver”.',
+	'UNINSTALL_DEFAULT'			=> 'You cannot uninstall the default style.',
 
 	'BROWSE_STYLES_DATABASE'	=> 'Browse styles database',
 ));