From dcc64cdeae4a825f12a69edc8348e8b149b1f16e Mon Sep 17 00:00:00 2001
From: RustDesk <71636191+rustdesk@users.noreply.github.com>
Date: Mon, 22 Jun 2026 14:47:12 +0800
Subject: [PATCH] cjk (#15379)

---
 src/lang.rs         | 74 ++++++++++++++++++++++++++++++++++++++++-----
 src/ui_interface.rs |  2 ++
 2 files changed, 69 insertions(+), 7 deletions(-)

diff --git a/src/lang.rs b/src/lang.rs
index 6302c2aed..077c6232a 100644
--- a/src/lang.rs
+++ b/src/lang.rs
@@ -103,15 +103,29 @@ pub const LANGS: &[(&str, &str)] = &[
     ("gu", "ગુજરાતી"),
 ];
 
-#[cfg(not(any(target_os = "android", target_os = "ios")))]
-pub fn translate(name: String) -> String {
-    let locale = sys_locale::get_locale().unwrap_or_default();
-    translate_locale(name, &locale)
+pub(crate) fn cjk_ui_unavailable() -> bool {
+    cfg!(all(
+        target_os = "linux",
+        target_arch = "aarch64",
+        feature = "flutter"
+    ))
 }
 
-pub fn translate_locale(name: String, locale: &str) -> String {
+pub(crate) fn is_cjk_lang(lang_or_locale: &str) -> bool {
+    let lang = lang_or_locale
+        .split(|c| c == '-' || c == '_')
+        .next()
+        .unwrap_or_default()
+        .to_lowercase();
+    matches!(lang.as_str(), "zh" | "ja" | "ko")
+}
+
+fn resolve_lang(saved_lang: &str, locale: &str, cjk_fallback: bool) -> String {
     let locale = locale.to_lowercase();
-    let mut lang = hbb_common::config::LocalConfig::get_option("lang").to_lowercase();
+    let mut lang = saved_lang.to_lowercase();
+    if cjk_fallback && is_cjk_lang(&lang) {
+        return "en".to_owned();
+    }
     if lang.is_empty() {
         // zh_CN on Linux, zh-Hans-CN on mac, zh_CN_#Hans on Android
         if locale.starts_with("zh") {
@@ -131,7 +145,25 @@ pub fn translate_locale(name: String, locale: &str) -> String {
             .unwrap_or_default()
             .to_owned();
     }
-    let lang = lang.to_lowercase();
+    if cjk_fallback && is_cjk_lang(&lang) {
+        "en".to_owned()
+    } else {
+        lang
+    }
+}
+
+#[cfg(not(any(target_os = "android", target_os = "ios")))]
+pub fn translate(name: String) -> String {
+    let locale = sys_locale::get_locale().unwrap_or_default();
+    translate_locale(name, &locale)
+}
+
+pub fn translate_locale(name: String, locale: &str) -> String {
+    let lang = resolve_lang(
+        &hbb_common::config::LocalConfig::get_option("lang"),
+        locale,
+        cjk_ui_unavailable(),
+    );
     let m = match lang.as_str() {
         "fr" => fr::T.deref(),
         "zh-cn" => cn::T.deref(),
@@ -275,4 +307,32 @@ mod test {
             ("{} times {4} makes {8}".to_string(), Some("2".to_string()))
         );
     }
+
+    #[test]
+    fn test_resolve_lang_forces_english_for_saved_cjk_when_target_disables_cjk() {
+        use super::resolve_lang as f;
+
+        assert_eq!(f("zh-cn", "en-US", true), "en");
+        assert_eq!(f("zh-tw", "en-US", true), "en");
+        assert_eq!(f("ja", "en-US", true), "en");
+        assert_eq!(f("ko", "en-US", true), "en");
+    }
+
+    #[test]
+    fn test_resolve_lang_forces_english_for_cjk_locale_when_target_disables_cjk() {
+        use super::resolve_lang as f;
+
+        assert_eq!(f("", "zh_CN", true), "en");
+        assert_eq!(f("", "ja-JP", true), "en");
+        assert_eq!(f("", "ko_KR", true), "en");
+    }
+
+    #[test]
+    fn test_resolve_lang_preserves_cjk_when_target_allows_cjk() {
+        use super::resolve_lang as f;
+
+        assert_eq!(f("zh-cn", "en-US", false), "zh-cn");
+        assert_eq!(f("", "zh_TW", false), "zh-tw");
+        assert_eq!(f("", "ja-JP", false), "ja");
+    }
 }
diff --git a/src/ui_interface.rs b/src/ui_interface.rs
index 650972f72..e01595ef7 100644
--- a/src/ui_interface.rs
+++ b/src/ui_interface.rs
@@ -902,8 +902,10 @@ pub fn get_async_job_status() -> String {
 #[inline]
 pub fn get_langs() -> String {
     use serde_json::json;
+    let hide_cjk = crate::lang::cjk_ui_unavailable();
     let mut x: Vec<(&str, String)> = crate::lang::LANGS
         .iter()
+        .filter(|a| !hide_cjk || !crate::lang::is_cjk_lang(a.0))
         .map(|a| (a.0, format!("{} ({})", a.1, a.0)))
         .collect();
     x.sort_by(|a, b| a.0.cmp(b.0));