/
handlers.py
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/
handlers.py
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"""Tornado handlers for nbconvert."""
# Copyright (c) Jupyter Development Team.
# Distributed under the terms of the Modified BSD License.
import io
import os
import zipfile
from tornado import gen, web, escape
from tornado.log import app_log
from ..base.handlers import (
IPythonHandler, FilesRedirectHandler,
path_regex,
)
from ..utils import maybe_future
from nbformat import from_dict
from ipython_genutils.py3compat import cast_bytes
from ipython_genutils import text
def find_resource_files(output_files_dir):
files = []
for dirpath, dirnames, filenames in os.walk(output_files_dir):
files.extend([os.path.join(dirpath, f) for f in filenames])
return files
def respond_zip(handler, name, output, resources):
"""Zip up the output and resource files and respond with the zip file.
Returns True if it has served a zip file, False if there are no resource
files, in which case we serve the plain output file.
"""
# Check if we have resource files we need to zip
output_files = resources.get('outputs', None)
if not output_files:
return False
# Headers
zip_filename = os.path.splitext(name)[0] + '.zip'
handler.set_attachment_header(zip_filename)
handler.set_header('Content-Type', 'application/zip')
handler.set_header('Cache-Control', 'no-store, no-cache, must-revalidate, max-age=0')
# Prepare the zip file
buffer = io.BytesIO()
zipf = zipfile.ZipFile(buffer, mode='w', compression=zipfile.ZIP_DEFLATED)
output_filename = os.path.splitext(name)[0] + resources['output_extension']
zipf.writestr(output_filename, cast_bytes(output, 'utf-8'))
for filename, data in output_files.items():
zipf.writestr(os.path.basename(filename), data)
zipf.close()
handler.finish(buffer.getvalue())
return True
def get_exporter(format, **kwargs):
"""get an exporter, raising appropriate errors"""
# if this fails, will raise 500
try:
from nbconvert.exporters.base import get_exporter
except ImportError as e:
raise web.HTTPError(500, f"Could not import nbconvert: {e}") from e
try:
Exporter = get_exporter(format)
except KeyError as e:
# should this be 400?
raise web.HTTPError(404, f"No exporter for format: {format}") from e
try:
return Exporter(**kwargs)
except Exception as e:
app_log.exception("Could not construct Exporter: %s", Exporter)
raise web.HTTPError(500, f"Could not construct Exporter: {e}") from e
class NbconvertFileHandler(IPythonHandler):
SUPPORTED_METHODS = ('GET',)
@property
def content_security_policy(self):
# In case we're serving HTML/SVG, confine any Javascript to a unique
# origin so it can't interact with the notebook server.
return super().content_security_policy + "; sandbox allow-scripts"
@web.authenticated
@gen.coroutine
def get(self, format, path):
exporter = get_exporter(format, config=self.config, log=self.log)
path = path.strip('/')
# If the notebook relates to a real file (default contents manager),
# give its path to nbconvert.
if hasattr(self.contents_manager, '_get_os_path'):
os_path = self.contents_manager._get_os_path(path)
ext_resources_dir, basename = os.path.split(os_path)
else:
ext_resources_dir = None
model = yield maybe_future(self.contents_manager.get(path=path))
name = model['name']
if model['type'] != 'notebook':
# not a notebook, redirect to files
return FilesRedirectHandler.redirect_to_files(self, path)
nb = model['content']
self.set_header('Last-Modified', model['last_modified'])
# create resources dictionary
mod_date = model['last_modified'].strftime(text.date_format)
nb_title = os.path.splitext(name)[0]
resource_dict = {
"metadata": {
"name": nb_title,
"modified_date": mod_date
},
"config_dir": self.application.settings['config_dir']
}
if ext_resources_dir:
resource_dict['metadata']['path'] = ext_resources_dir
try:
output, resources = exporter.from_notebook_node(
nb,
resources=resource_dict
)
except Exception as e:
self.log.exception("nbconvert failed: %s", e)
raise web.HTTPError(500, f"nbconvert failed: {e}") from e
if respond_zip(self, name, output, resources):
return
# Force download if requested
if self.get_argument('download', 'false').lower() == 'true':
filename = os.path.splitext(name)[0] + resources['output_extension']
self.set_attachment_header(filename)
# MIME type
if exporter.output_mimetype:
self.set_header('Content-Type',
f'{exporter.output_mimetype}; charset=utf-8')
self.set_header('Cache-Control', 'no-store, no-cache, must-revalidate, max-age=0')
self.finish(output)
class NbconvertPostHandler(IPythonHandler):
SUPPORTED_METHODS = ('POST',)
@property
def content_security_policy(self):
# In case we're serving HTML/SVG, confine any Javascript to a unique
# origin so it can't interact with the notebook server.
return super().content_security_policy + "; sandbox allow-scripts"
@web.authenticated
def post(self, format):
exporter = get_exporter(format, config=self.config)
model = self.get_json_body()
name = model.get('name', 'notebook.ipynb')
nbnode = from_dict(model['content'])
try:
output, resources = exporter.from_notebook_node(nbnode, resources={
"metadata": {"name": name[:name.rfind('.')],},
"config_dir": self.application.settings['config_dir'],
})
except Exception as e:
raise web.HTTPError(500, f"nbconvert failed: {e}") from e
if respond_zip(self, name, output, resources):
return
# MIME type
if exporter.output_mimetype:
self.set_header('Content-Type',
f'{exporter.output_mimetype}; charset=utf-8')
self.finish(output)
#-----------------------------------------------------------------------------
# URL to handler mappings
#-----------------------------------------------------------------------------
_format_regex = r"(?P<format>\w+)"
default_handlers = [
(fr"/nbconvert/{_format_regex}", NbconvertPostHandler),
(fr"/nbconvert/{_format_regex}{path_regex}", NbconvertFileHandler),
]