From 335c056a4b5a79f690d58146f56cacaf5ed99da7 Mon Sep 17 00:00:00 2001
From: Arc <ben@arc.wales>
Date: Fri, 1 May 2026 13:05:47 +0100
Subject: [PATCH] feat: translation support for extensions

---
 lnbits/core/views/generic.py | 10 +++++---
 lnbits/helpers.py            | 48 +++++++++++++++++++++++++++++++++++-
 lnbits/templates/base.html   |  4 ++-
 3 files changed, 57 insertions(+), 5 deletions(-)

diff --git a/lnbits/core/views/generic.py b/lnbits/core/views/generic.py
index e073a5c4f..9c024d04d 100644
--- a/lnbits/core/views/generic.py
+++ b/lnbits/core/views/generic.py
@@ -20,7 +20,7 @@ from lnbits.decorators import (
     check_first_install,
     check_user_exists,
 )
-from lnbits.helpers import check_callback_url, template_renderer
+from lnbits.helpers import check_callback_url, extension_id_from_path, template_renderer
 from lnbits.settings import settings
 
 from ..crud import get_user
@@ -198,7 +198,9 @@ admin_ui_checks = [Depends(check_admin), Depends(check_admin_ui)]
 async def index(
     request: Request, user: User = Depends(check_user_exists)
 ) -> HTMLResponse:
-    return template_renderer().TemplateResponse(
+    return template_renderer(
+        extension_id=extension_id_from_path(request.url.path)
+    ).TemplateResponse(
         request,
         "base.html",
         {
@@ -211,7 +213,9 @@ async def index(
 @generic_router.get("/node/public")
 @generic_router.get("/first_install", dependencies=[Depends(check_first_install)])
 async def index_public(request: Request) -> HTMLResponse:
-    return template_renderer().TemplateResponse(request, "base.html", {"public": True})
+    return template_renderer(
+        extension_id=extension_id_from_path(request.url.path)
+    ).TemplateResponse(request, "base.html", {"public": True})
 
 
 @generic_router.get("/uuidv4/{hex_value}")
diff --git a/lnbits/helpers.py b/lnbits/helpers.py
index 88a001b34..200bbf017 100644
--- a/lnbits/helpers.py
+++ b/lnbits/helpers.py
@@ -52,7 +52,45 @@ def static_url_for(static: str, path: str) -> str:
     return f"/{static}/{path}?v={settings.server_startup_time}"
 
 
-def template_renderer(additional_folders: list | None = None) -> Jinja2Templates:
+def extension_id_from_path(path: str) -> str | None:
+    parts = [part for part in path.split("/") if part]
+    if not parts:
+        return None
+
+    if len(parts) >= 3 and parts[0] == "upgrades":
+        return parts[2]
+
+    ext_id = parts[0]
+    ext_i18n_dir = Path(
+        settings.lnbits_extensions_path, "extensions", ext_id, "static", "i18n"
+    )
+    if ext_i18n_dir.is_dir():
+        return ext_id
+
+    return None
+
+
+def extension_i18n_urls(extension_id: str | None) -> list[str]:
+    if not extension_id:
+        return []
+
+    i18n_dir = Path(
+        settings.lnbits_extensions_path, "extensions", extension_id, "static", "i18n"
+    )
+    if not i18n_dir.is_dir():
+        return []
+
+    files = [file.name for file in i18n_dir.glob("*.js") if file.is_file()]
+    return [
+        static_url_for(f"{extension_id}/static", f"i18n/{filename}")
+        for filename in sorted(files, key=lambda name: (name != "en.js", name))
+    ]
+
+
+def template_renderer(
+    additional_folders: list | None = None,
+    extension_id: str | None = None,
+) -> Jinja2Templates:
     folders = [
         "lnbits/templates",
         settings.extension_builder_working_dir_path.as_posix(),
@@ -86,6 +124,14 @@ def template_renderer(additional_folders: list | None = None) -> Jinja2Templates
             t.env.globals["INCLUDED_CSS"] = vendor_files["css"]
             t.env.globals["INCLUDED_COMPONENTS"] = vendor_files["components"]
 
+    if not extension_id and additional_folders:
+        for folder in additional_folders:
+            parts = Path(folder).parts
+            if parts and parts[-1] == "templates" and len(parts) >= 2:
+                extension_id = parts[-2]
+                break
+    t.env.globals["INCLUDED_EXTENSION_I18N"] = extension_i18n_urls(extension_id)
+
     # backwards compatibility for extensions (tpos)
     t.env.globals["LNBITS_DENOMINATION"] = settings.lnbits_denomination
 
diff --git a/lnbits/templates/base.html b/lnbits/templates/base.html
index c81271b2e..f98a38dd0 100644
--- a/lnbits/templates/base.html
+++ b/lnbits/templates/base.html
@@ -90,7 +90,9 @@
       window.g.isPublicPage = false
       {% endif %}
     </script>
-    {% endif %}
+    {% endif %} {% for url in INCLUDED_EXTENSION_I18N %}
+    <script src="{{ url }}"></script>
+    {% endfor %}
     <!-- app init -->
     <script>
       window.app = Vue.createApp({