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