From a9713bd497be9622cdcb51b24cc1cb589bbd3ede Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?No=C3=A9=20Sierra-Velasquez?= <rakjlou@gmail.com>
Date: Thu, 19 Feb 2026 18:14:14 +0100
Subject: [PATCH] Fix Kobo sync failure behind reverse proxy: rewrite
 library_sync URL in init response

The HandleInitRequest() function rewrites image URLs to point to the local
Calibre-Web instance, but library_sync was left pointing to storeapi.kobo.com.
This caused Kobo e-readers to call Kobo's servers for sync instead of the local
server, resulting in no books being synced when running behind a reverse proxy.
---
 cps/kobo.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cps/kobo.py b/cps/kobo.py
index da9c9bc55..776510a10 100644
--- a/cps/kobo.py
+++ b/cps/kobo.py
@@ -1101,6 +1101,8 @@ def HandleInitRequest():
                                                                width="{width}",
                                                                height="{height}",
                                                                isGreyscale='false'))
+        kobo_resources["library_sync"] = calibre_web_url + url_for("kobo.HandleSyncRequest",
+                                                                    auth_token=kobo_auth.get_auth_token())
     else:
         kobo_resources["image_host"] = url_for("web.index", _external=True).strip("/")
         kobo_resources["image_url_quality_template"] = unquote(url_for("kobo.HandleCoverImageRequest",
@@ -1118,6 +1120,9 @@ def HandleInitRequest():
                                                                height="{height}",
                                                                isGreyscale='false',
                                                                _external=True))
+        kobo_resources["library_sync"] = url_for("kobo.HandleSyncRequest",
+                                                  auth_token=kobo_auth.get_auth_token(),
+                                                  _external=True)
 
     response = make_response(jsonify({"Resources": kobo_resources}))
     response.headers["x-kobo-apitoken"] = "e30="