set draft of customlabextension

voila/configuration.py

@@ -35,6 +35,7 @@ class VoilaConfiguration(traitlets.config.Configurable):
     template = Unicode(
         "lab", config=True, allow_none=True, help=("template name to be used by voila.")
     )
+    labextensions_url = Unicode("", config=True, help=("Custom lab extensions url."))
     classic_tree = Bool(
         False,
         config=True,

voila/handler.py

@@ -115,6 +115,11 @@ async def get_generator(self, path=None):
 
         template_arg = self.get_argument("template", None)
         theme_arg = self.get_argument("theme", None)
+        labextensions_url = self.get_argument("labextensions_url", None)
+
+        # Set the labextension_url if it is provided
+        if labextensions_url:
+            self.voila_configuration.labextensions_url = labextensions_url
 
         # Compose reply
         self.set_header("Content-Type", "text/html")

voila/utils.py

@@ -8,16 +8,20 @@
 #############################################################################
 
 import asyncio
+import io
 import json
 import os
 import sys
+import tempfile
 import threading
 import warnings
 from copy import deepcopy
 from functools import partial
 from pathlib import Path
 from typing import Awaitable, Dict, List
+import zipfile
 
+import requests
 import websockets
 from jupyter_core.paths import jupyter_path
 from jupyter_server.config_manager import recursive_update
@@ -97,24 +101,47 @@ def get_page_config(base_url, settings, log, voila_configuration: VoilaConfigura
         "baseUrl": base_url,
         "terminalsAvailable": False,
         "fullStaticUrl": url_path_join(base_url, "voila/static"),
-        "fullLabextensionsUrl": url_path_join(base_url, "voila/labextensions"),
         "extensionConfig": voila_configuration.extension_config,
+        "fullLabextensionsUrl": url_path_join(
+            voila_configuration.labextensions_url, "labextensions"
+        )
+        or url_path_join(base_url, "voila/labextensions"),
     }
+
     mathjax_config = settings.get("mathjax_config", "TeX-AMS_CHTML-full,Safe")
     mathjax_url = settings.get(
         "mathjax_url", "https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/MathJax.js"
     )
     page_config.setdefault("mathjaxConfig", mathjax_config)
     page_config.setdefault("fullMathjaxUrl", mathjax_url)
-    labextensions_path = jupyter_path("labextensions")
-
-    recursive_update(
-        page_config,
-        gpc(
-            labextensions_path,
-            logger=log,
-        ),
+    print("########### page_config", page_config)
+
+    # If I want to do use the existing url and the custom, the the server here should
+    # have the 'download_all_extensions' endpoint...
+
+    download_extensions_url = url_path_join(
+        page_config.get("fullLabextensionsUrl"), "download_all_extensions"
     )
+
+    response = requests.get(download_extensions_url)
+    response.raise_for_status()
+
+    with tempfile.TemporaryDirectory() as labextensions_temp_path:
+
+        # Extract the ZIP file into the temporary directory
+        with zipfile.ZipFile(io.BytesIO(response.content)) as zip_ref:
+            zip_ref.extractall(labextensions_temp_path)
+
+            # I need to replace labextensions_temp_path with the actual result of
+            recursive_update(
+                page_config,
+                gpc(
+                    [labextensions_temp_path],
+                    logger=log,
+                ),
+            )
+
+    print("################Updatedsss page_config", page_config)
     disabled_extensions = [
         "@voila-dashboards/jupyterlab-preview",
         "@jupyter/collaboration-extension",