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# Copyright (c) Jupyter Development Team.
# Distributed under the terms of the Modified BSD License.
from pathlib import Path
from traitlets import default, observe, Unicode
from tornado.web import RedirectHandler
from jupyter_server.extension.application import ExtensionApp
from jupyter_server.utils import url_path_join
try:
from jupyter_server.transutils import _i18n
except ImportError:
from jupyter_server.transutils import _ as _i18n
STATIC_ASSETS_PATH = Path(__file__).parent / "static"
class DeprecatedRedirectHandler(RedirectHandler):
def get(self, *args, **kwargs):
import warnings
warnings.warn(
_i18n("Redirecting old Notebook MathJax URL to new one. This will be removed in a future release."),
PendingDeprecationWarning,
)
super().get(*args, **kwargs)
class MathJaxExtension(ExtensionApp):
name = "jupyter_server_mathjax"
# By listing the path to the assets here, jupyter_server
# automatically creates a static file handler at
# /static/jupyter_server_mathjax/...
static_paths = [str(STATIC_ASSETS_PATH)]
mathjax_config = Unicode(
"TeX-AMS-MML_HTMLorMML-full,Safe",
config=True,
help=_i18n("""The MathJax.js configuration file that is to be used."""),
)
@observe("mathjax_config")
def _update_mathjax_config(self, change):
self.log.info(_i18n("Using MathJax configuration file: %s"), change["new"])
def initialize_settings(self):
# Add settings specific to this extension to the
# tornado webapp settings.
self.settings.update(
{
"mathjax_config": self.mathjax_config,
"mathjax_url": url_path_join(self.static_url_prefix, "MathJax.js"),
}
)
def initialize_handlers(self):
webapp = self.serverapp.web_app
base_url = self.serverapp.base_url
host_pattern = ".*$"
# Add a deprecated redirect for all MathJax paths from the classic
# notebook to the static endpoint created for this extension.
webapp.add_handlers(
host_pattern,
[
(
url_path_join(base_url, "/static/components/MathJax/(.*)"),
DeprecatedRedirectHandler,
{
"url": url_path_join(
self.static_url_prefix, "/{0}" # {0} = group 0 in url path
)
},
)
],
)
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