fix(plugin): use specific runtime not connected error

src/langbot/pkg/api/http/controller/groups/plugins.py

@@ -39,6 +39,16 @@ def _normalize_plugin_asset_path(filepath: str) -> str | None:
     return f'assets/{normalized}'
 
 
+def _get_request_origin() -> str:
+    """Return the public request origin, respecting reverse-proxy headers."""
+    forwarded_proto = quart.request.headers.get('X-Forwarded-Proto', '').split(',')[0].strip()
+    forwarded_host = quart.request.headers.get('X-Forwarded-Host', '').split(',')[0].strip()
+
+    scheme = forwarded_proto or quart.request.scheme
+    host = forwarded_host or quart.request.host
+    return f'{scheme}://{host}'
+
+
 @group.group_class('plugins', '/api/v1/plugins')
 class PluginsRouterGroup(group.RouterGroup):
     async def _check_extensions_limit(self) -> str | None:
@@ -189,7 +199,7 @@ class PluginsRouterGroup(group.RouterGroup):
             # CSP for HTML pages served to sandboxed iframes (opaque origin).
             # 'self' doesn't work in sandboxed iframes — use actual server origin.
             if mime_type and mime_type.startswith('text/html'):
-                origin = f'{quart.request.scheme}://{quart.request.host}'
+                origin = _get_request_origin()
                 resp.headers['Content-Security-Policy'] = (
                     f'default-src {origin}; '
                     f"script-src {origin} 'unsafe-inline'; "

src/langbot/pkg/plugin/connector.py

@@ -35,6 +35,10 @@ from ..core import taskmgr
 from ..entity.persistence import plugin as persistence_plugin
 
 
+class PluginRuntimeNotConnectedError(RuntimeError):
+    """Raised when plugin runtime operations are requested before connection."""
+
+
 class PluginRuntimeConnector:
     """Plugin runtime connector"""
 
@@ -192,7 +196,7 @@ class PluginRuntimeConnector:
 
     async def ping_plugin_runtime(self):
         if not hasattr(self, 'handler'):
-            raise Exception('Plugin runtime is not connected')
+            raise PluginRuntimeNotConnectedError('Plugin runtime is not connected')
 
         return await self.handler.ping()
 

tests/unit_tests/plugin/test_connector_ping.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+from types import SimpleNamespace
+from unittest.mock import AsyncMock
+
+import pytest
+
+from langbot.pkg.plugin.connector import PluginRuntimeConnector, PluginRuntimeNotConnectedError
+
+
+def make_connector() -> PluginRuntimeConnector:
+    app = SimpleNamespace(instance_config=SimpleNamespace(data={'plugin': {'enable': True}}))
+    return PluginRuntimeConnector(app, AsyncMock())
+
+
+@pytest.mark.asyncio
+async def test_ping_plugin_runtime_raises_specific_error_when_not_connected():
+    connector = make_connector()
+
+    with pytest.raises(PluginRuntimeNotConnectedError, match='Plugin runtime is not connected'):
+        await connector.ping_plugin_runtime()
+
+
+@pytest.mark.asyncio
+async def test_ping_plugin_runtime_delegates_to_connected_handler():
+    connector = make_connector()
+    connector.handler = SimpleNamespace(ping=AsyncMock(return_value='pong'))
+
+    result = await connector.ping_plugin_runtime()
+
+    assert result == 'pong'
+    connector.handler.ping.assert_awaited_once()

web/src/app/infra/http/BackendClient.ts

@@ -590,6 +590,9 @@ export class BackendClient extends BaseHttpClient {
     name: string,
     filepath: string,
   ): string {
+    if (this.instance.defaults.baseURL === '/') {
+      return `${window.location.origin}/api/v1/plugins/${author}/${name}/assets/${filepath}`;
+    }
     return (
       this.instance.defaults.baseURL +
       `/api/v1/plugins/${author}/${name}/assets/${filepath}`