Fix: lite kernels

datalayer_core/handlers/service_worker/__init__.py

@@ -0,0 +1,4 @@
+# Copyright (c) 2023-2024 Datalayer, Inc.
+#
+# Datalayer License
+

datalayer_core/handlers/service_worker/handler.py

@@ -0,0 +1,39 @@
+# Copyright (c) 2023-2024 Datalayer, Inc.
+#
+# Datalayer License
+
+from pathlib import Path
+from typing import Optional
+from tornado import web
+
+from jupyter_server.base.handlers import JupyterHandler
+
+
+class ServiceWorkerHandler(web.StaticFileHandler, JupyterHandler):
+    """Serve the service worker script."""
+
+    def initialize(self):
+        """Initialize the API spec handler."""
+        # Must match the folder containing the service worker asset as specified
+        # in the webpack.lab-config.js
+        extensionStatic = Path(__file__).parent.parent.parent / "labextension" / "static"
+        super().initialize(path=str(extensionStatic))
+
+    def validate_absolute_path(self, root: str, absolute_path: str) -> Optional[str]:
+        """Only allow to serve the service worker"""
+        # Must match the filename name set in webpack.lab-config.js
+        if Path(absolute_path).name != 'lite-service-worker.js':
+            raise web.HTTPError(404)
+        return super().validate_absolute_path(root, absolute_path)
+
+    def get_content_type(self):
+        """Get the content type."""
+        return "text/javascript"
+
+    def set_extra_headers(self, path: str) -> None:
+        """Add extra headers to the response"""
+        # Allow a service worker to get a broader scope than
+        # its path.
+        # See https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/register#examples
+        #     https://medium.com/dev-channel/two-http-headers-related-to-service-workers-you-never-may-have-heard-of-c8862f76cc60
+        self.set_header("Service-Worker-Allowed", "/")

datalayer_core/serverapplication.py

@@ -12,6 +12,7 @@
 from datalayer_core.handlers.index.handler import IndexHandler
 from datalayer_core.handlers.config.handler import ConfigHandler
 from datalayer_core.handlers.login.handler import LoginHandler
+from datalayer_core.handlers.service_worker.handler import ServiceWorkerHandler
 
 from datalayer_core.authn.state import get_server_port
 
@@ -109,6 +110,7 @@ def initialize_handlers(self):
             ("datalayer", IndexHandler),
             (url_path_join("datalayer", "config"), ConfigHandler),
             (url_path_join("datalayer", "login"), LoginHandler),
+            (url_path_join("datalayer", "service-worker", r"([^/]+\.js)"), ServiceWorkerHandler),
         ]
         self.handlers.extend(handlers)
 

package.json

@@ -160,8 +160,8 @@
     "@jupyterlab/theme-light-extension": "4.1.0",
     "@jupyterlab/translation": "4.1.0",
     "@jupyterlab/ui-components": "4.1.0",
-    "@jupyterlite/server": "0.2.2",
-    "@jupyterlite/server-extension": "0.2.2",
+    "@jupyterlite/server": "^0.4.0",
+    "@jupyterlite/server-extension": "^0.4.0",
     "@jupyter/ydoc": "1.1.1",
     "@lumino/algorithm": "2.0.1",
     "@lumino/application": "2.2.0",
@@ -247,6 +247,18 @@
         "bundled": true,
         "singleton": true
       },
+      "@jupyterlite/contents": {
+        "bundled": true,
+        "singleton": true
+      },
+      "@jupyterlite/kernel": {
+        "bundled": true,
+        "singleton": true
+      },
+      "@jupyterlite/server": {
+        "bundled": true,
+        "singleton": true
+      },
       "@primer/react": {
         "bundled": true,
         "singleton": true

pyproject.toml

@@ -75,6 +75,7 @@ exclude = [".github", "binder", ".yarn"]
 [tool.hatch.build.targets.wheel]
 artifacts = [
     "datalayer_core/static",
+    "datalayer_core/labextension/static/lite-service-worker.js",
     "datalayer_core/about/about.md",
 ]