Add watchlist backup import export

http_handler.py

@@ -58,6 +58,7 @@ class HandlerContext:
     download_watchlist_item: object
     ensure_runtime: object
     episode_list: object
+    export_watchlist_backup: object
     get_config_snapshot: object
     get_jellyfin_sync_status: object
     get_watchlist_homepage_summary: object
@@ -65,6 +66,7 @@ class HandlerContext:
     get_watchlist_refresh_status: object
     http_error: object
     index_html: str
+    import_watchlist_backup: object
     queue_html: str
     reconcile_watchlist_downloaded_files: object
     remove_from_watchlist: object
@@ -747,6 +749,12 @@ class Handler(BaseHTTPRequestHandler):
             elif parsed.path == "/api/config/jellyfin/sync-status":
                 Handler._runtime(self)
                 self.json(Handler._context(self).get_jellyfin_sync_status())
+            elif parsed.path == "/api/config/watchlist/export":
+                Handler._runtime(self)
+                self.json_attachment(
+                    Handler._context(self).export_watchlist_backup(),
+                    "ani-cli-web-watchlist-backup.json",
+                )
             else:
                 self.error(HTTPStatus.NOT_FOUND, "Not found")
         except Exception as exc:
@@ -796,6 +804,9 @@ class Handler(BaseHTTPRequestHandler):
                 if str(merged.get("download_dir") or "").strip():
                     Handler.validate_remote_path(self, merged["download_dir"], "download directory")
                 self.json(Handler._context(self).reconcile_watchlist_downloaded_files(merged))
+            elif parsed.path == "/api/config/watchlist/import":
+                payload = Handler.require_json_object(self, self.body_json())
+                self.json(Handler._context(self).import_watchlist_backup(payload))
             elif parsed.path == "/api/config/webhook/test":
                 payload = Handler.require_json_object(self, self.body_json())
                 validate_discord_webhook_url(payload.get("discord_webhook_url"))
@@ -1014,6 +1025,19 @@ class Handler(BaseHTTPRequestHandler):
         data = json.dumps(payload).encode("utf-8")
         self.write_response_bytes(data, status, {"Content-Type": "application/json"})
 
+    def json_attachment(self, payload, filename, status=HTTPStatus.OK):
+        data = json.dumps(payload, indent=2, sort_keys=True).encode("utf-8")
+        safe_filename = str(filename or "watchlist-backup.json").replace('"', "")
+        self.write_response_bytes(
+            data,
+            status,
+            {
+                "Content-Type": "application/json",
+                "Content-Disposition": f'attachment; filename="{safe_filename}"',
+                "Cache-Control": "no-store",
+            },
+        )
+
     def write_response_bytes(self, payload, status, headers):
         try:
             self.send_response(status)