feat: render ipypopout content in jupyter notebook and lab

Instead of having to rely on voila to display widgets in a popout
window, solara itself now can render it. This allows project to
drop the dependency on voila.

solara/server/flask.py

@@ -192,7 +192,7 @@ def assets(path):
     return flask.Response("not found", status=404)
 
 
-@blueprint.route("/static/nbextensions/<dir>/<filename>")
+@blueprint.route("/jupyter/nbextensions/<dir>/<filename>")
 def nbext(dir, filename):
     if not allowed():
         abort(401)

solara/server/jupyter/server_extension.py

@@ -2,22 +2,33 @@
 
 from solara.server.cdn_helper import cdn_url_path
 from solara.server.jupyter.cdn_handler import CdnHandler
+from .solara import SolaraHandler, Assets, ReadyZ
 
 
 def _jupyter_server_extension_paths():
     return [{"module": "solara.server.jupyter.server_extension"}]
 
 
 def _load_jupyter_server_extension(server_app):
+    # a dummy app, so that server.read_root can be used
+    import solara.server.app
+
+    solara.server.app.apps["__default__"] = solara.server.app.AppScript("solara.server.jupyter.solara:Page")
+
     web_app = server_app.web_app
 
     host_pattern = ".*$"
     base_url = url_path_join(web_app.settings["base_url"])
+    print("base_url", base_url)
 
     web_app.add_handlers(
         host_pattern,
         [
-            (url_path_join(base_url, f"/{cdn_url_path}/(.*)"), CdnHandler, {}),
+            (url_path_join(base_url, f"/{cdn_url_path}/(.*)"), CdnHandler, {}),  # kept for backward compatibility
+            (url_path_join(base_url, f"/solara/{cdn_url_path}/(.*)"), CdnHandler, {}),
+            (url_path_join(base_url, "/solara/static/assets/(.*)"), Assets, {}),
+            (url_path_join(base_url, "/solara/readyz"), ReadyZ, {}),
+            (url_path_join(base_url, "/solara(.*)"), SolaraHandler, {}),
         ],
     )
 

solara/server/jupyter/solara.py

@@ -0,0 +1,94 @@
+import json
+import logging
+import os
+from pathlib import Path
+
+import tornado.web
+from jupyter_server.base.handlers import JupyterHandler
+import solara.server.server as server
+
+from solara.server.utils import path_is_child_of
+
+logger = logging.getLogger("solara.server.jupyter.solara")
+
+
+import solara
+
+
+@solara.component
+def Page():
+    solara.Error("Hi, you should not see this, we only support ipypopout for now")
+
+
+class SolaraHandler(JupyterHandler):
+    async def get(self, path=None):
+        try:
+            # base url ends with /
+            base_url = self.settings["base_url"]
+            # root_path's do not end with /
+            jupyter_root_path = ""
+            if base_url and base_url.endswith("/"):
+                jupyter_root_path = base_url[:-1]
+            root_path = f"{jupyter_root_path}/solara"
+            content = server.read_root(path="", root_path=root_path, jupyter_root_path=jupyter_root_path)
+        except Exception as e:
+            logger.exception(e)
+            raise tornado.web.HTTPError(500)
+
+        if content is None:
+            raise tornado.web.HTTPError(404)
+        else:
+            self.set_header("Content-Type", "text/html")
+            self.write(content)
+
+
+# similar to voila
+class MultiStaticFileHandler(tornado.web.StaticFileHandler):
+    """A static file handler that 'merges' a list of directories
+
+    If initialized like this::
+
+        application = web.Application([
+            (r"/content/(.*)", web.MultiStaticFileHandler, {"paths": ["/var/1", "/var/2"]}),
+        ])
+
+    A file will be looked up in /var/1 first, then in /var/2.
+
+    """
+
+    def initialize(self, paths, default_filename=None):  # type: ignore
+        self.roots = paths
+        super().initialize(path=paths[0], default_filename=default_filename)
+
+    def get_absolute_path(self, root: str, path: str) -> str:  # type: ignore
+        # find the first absolute path that exists
+        self.root = self.roots[0]
+        abspath = os.path.abspath(os.path.join(root, path))
+        for root in self.roots[1:]:
+            abspath = os.path.abspath(os.path.join(root, path))
+            # return early if someone tries to access a file outside of the directory
+            if os.path.exists(abspath):
+                self.root = root  # make sure all the other methods in the base class know how to find the file
+                break
+
+        # tornado probably already does this, but just to be sure we don't serve files outside of the directory
+        # and that we are consistent with starlette and flask
+        if not path_is_child_of(Path(abspath), Path(self.root)):
+            raise PermissionError(f"Trying to read from outside of cache directory: {abspath} is not a subdir of {self.root}")
+
+        return abspath
+
+
+class Assets(MultiStaticFileHandler):
+    def initialize(self):  # type: ignore
+        super().initialize(server.asset_directories())
+        logging.error("Using %r as assets directories", self.roots)
+
+
+class ReadyZ(JupyterHandler):
+    def get(self):
+        json_data, status = server.readyz()
+        json_response = json.dumps(json_data)
+        self.set_header("Content-Type", "application/json")
+        self.set_status(status)
+        self.write(json_response)

solara/server/server.py

@@ -268,6 +268,7 @@ def asset_directories():
 def read_root(
     path: str,
     root_path: str = "",
+    jupyter_root_path: str = "",
     render_kwargs={},
     use_nbextensions=True,
     ssg_data=None,
@@ -377,6 +378,7 @@ def include_js(path: str, module=False) -> Markup:
         "title": title,
         "path": path,
         "root_path": root_path,
+        "jupyter_root_path": jupyter_root_path,
         "resources": resources,
         "theme": settings.theme.dict(),
         "production": settings.main.mode == "production",

solara/server/starlette.py

@@ -668,7 +668,7 @@ def expand(named_tuple):
     *([Mount(f"/{cdn_url_path}", app=StaticCdn(directory=settings.assets.proxy_cache_dir))] if solara.settings.assets.proxy else []),
     Mount(f"{prefix}/static/public", app=StaticPublic()),
     Mount(f"{prefix}/static/assets", app=StaticAssets()),
-    Mount(f"{prefix}/static/nbextensions", app=StaticNbFiles()),
+    Mount(f"{prefix}/jupyter/nbextensions", app=StaticNbFiles()),
     Mount(f"{prefix}/static", app=StaticFilesOptionalAuth(directory=server.solara_static)),
     Route("/{fullpath:path}", endpoint=root),
 ]

solara/server/static/main-vuetify.js

@@ -127,7 +127,7 @@ async function solaraInit(mountId, appName) {
             window.navigator.sendBeacon(close_url);
         }
     });
-    let kernel = await solara.connectKernel(solara.rootPath + '/jupyter', kernelId)
+    let kernel = await solara.connectKernel(solara.jupyterRootPath, kernelId)
     if (!kernel) {
         return;
     }

solara/server/templates/solara.html.j2

@@ -31,7 +31,7 @@
 
     <script id="jupyter-config-data" type="application/json">
     {
-        "baseUrl": "{{root_path}}/",
+        "baseUrl": "{{jupyter_root_path}}/",
         "kernelId": "1234"
     }
     </script>
@@ -243,12 +243,13 @@
     {% endif %}
     <script>
         solara.rootPath = {{ root_path | tojson | safe}};
+        solara.jupyterRootPath = {{ jupyter_root_path | tojson | safe}};
         solara.cdn = {{ cdn | tojson | safe }};
         // the vue templates expect it to not have a trailing slash
         solara.cdn = solara.cdn.replace(/\/$/, '');
         // keep this for backwards compatibility
         window.solara_cdn = solara.cdn;
-        console.log("rootPath", solara.rootPath);
+        console.log("solara config", {rootPath: solara.rootPath, jupyterRootPath: solara.jupyterRootPath, cdn: solara.cdn});
 
         async function changeThemeCSS(theme) {
             let css = await fetch(`${solara.rootPath}/static/assets/theme-${theme}.css`).then(r => r.text());
@@ -441,7 +442,7 @@
         {% endif -%}
         nbextensionHashes = {{ resources.nbextensions_hashes | tojson | safe }};
         requirejs.config({
-            baseUrl: '{{root_path}}/static/',
+            baseUrl: '{{jupyter_root_path}}',
             waitSeconds: 3000,
             map: {
                 '*': {
@@ -466,7 +467,7 @@
             });
         requirejs([
             {% for ext in resources.nbextensions if ext != 'jupyter-vuetify/extension' and ext != 'jupyter-vue/extension' -%}
-        "{{root_path}}/static/nbextensions/{{ ext }}.js",
+        "{{jupyter_root_path}}/nbextensions/{{ ext }}.js",
             {% endfor %}
         ]);
         (async function () {