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624 lines
22 KiB
624 lines
22 KiB
"""A contents manager that uses the local file system for storage."""
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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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from datetime import datetime
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import errno
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import io
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import os
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import shutil
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import stat
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import sys
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import warnings
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import mimetypes
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import nbformat
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from send2trash import send2trash
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from tornado import web
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from .filecheckpoints import FileCheckpoints
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from .fileio import FileManagerMixin
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from .manager import ContentsManager
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from ...utils import exists
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from ipython_genutils.importstring import import_item
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from traitlets import Any, Unicode, Bool, TraitError, observe, default, validate
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from ipython_genutils.py3compat import getcwd, string_types
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from notebook import _tz as tz
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from notebook.utils import (
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is_hidden, is_file_hidden,
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to_api_path,
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)
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from notebook.base.handlers import AuthenticatedFileHandler
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from notebook.transutils import _
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from os.path import samefile
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_script_exporter = None
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def _post_save_script(model, os_path, contents_manager, **kwargs):
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"""convert notebooks to Python script after save with nbconvert
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replaces `jupyter notebook --script`
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"""
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from nbconvert.exporters.script import ScriptExporter
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warnings.warn("`_post_save_script` is deprecated and will be removed in Notebook 5.0", DeprecationWarning)
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if model['type'] != 'notebook':
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return
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global _script_exporter
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if _script_exporter is None:
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_script_exporter = ScriptExporter(parent=contents_manager)
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log = contents_manager.log
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base, ext = os.path.splitext(os_path)
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script, resources = _script_exporter.from_filename(os_path)
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script_fname = base + resources.get('output_extension', '.txt')
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log.info("Saving script /%s", to_api_path(script_fname, contents_manager.root_dir))
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with io.open(script_fname, 'w', encoding='utf-8') as f:
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f.write(script)
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class FileContentsManager(FileManagerMixin, ContentsManager):
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root_dir = Unicode(config=True)
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@default('root_dir')
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def _default_root_dir(self):
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try:
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return self.parent.notebook_dir
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except AttributeError:
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return getcwd()
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save_script = Bool(False, config=True, help='DEPRECATED, use post_save_hook. Will be removed in Notebook 5.0')
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@observe('save_script')
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def _update_save_script(self, change):
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if not change['new']:
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return
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self.log.warning("""
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`--script` is deprecated and will be removed in notebook 5.0.
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You can trigger nbconvert via pre- or post-save hooks:
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ContentsManager.pre_save_hook
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FileContentsManager.post_save_hook
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A post-save hook has been registered that calls:
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jupyter nbconvert --to script [notebook]
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which behaves similarly to `--script`.
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""")
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self.post_save_hook = _post_save_script
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post_save_hook = Any(None, config=True, allow_none=True,
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help="""Python callable or importstring thereof
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to be called on the path of a file just saved.
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This can be used to process the file on disk,
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such as converting the notebook to a script or HTML via nbconvert.
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It will be called as (all arguments passed by keyword)::
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hook(os_path=os_path, model=model, contents_manager=instance)
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- path: the filesystem path to the file just written
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- model: the model representing the file
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- contents_manager: this ContentsManager instance
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"""
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)
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@validate('post_save_hook')
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def _validate_post_save_hook(self, proposal):
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value = proposal['value']
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if isinstance(value, string_types):
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value = import_item(value)
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if not callable(value):
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raise TraitError("post_save_hook must be callable")
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return value
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def run_post_save_hook(self, model, os_path):
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"""Run the post-save hook if defined, and log errors"""
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if self.post_save_hook:
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try:
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self.log.debug("Running post-save hook on %s", os_path)
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self.post_save_hook(os_path=os_path, model=model, contents_manager=self)
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except Exception as e:
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self.log.error("Post-save hook failed o-n %s", os_path, exc_info=True)
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raise web.HTTPError(500, u'Unexpected error while running post hook save: %s'
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% e) from e
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@validate('root_dir')
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def _validate_root_dir(self, proposal):
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"""Do a bit of validation of the root_dir."""
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value = proposal['value']
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if not os.path.isabs(value):
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# If we receive a non-absolute path, make it absolute.
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value = os.path.abspath(value)
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if not os.path.isdir(value):
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raise TraitError("%r is not a directory" % value)
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return value
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@default('checkpoints_class')
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def _checkpoints_class_default(self):
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return FileCheckpoints
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delete_to_trash = Bool(True, config=True,
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help="""If True (default), deleting files will send them to the
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platform's trash/recycle bin, where they can be recovered. If False,
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deleting files really deletes them.""")
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@default('files_handler_class')
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def _files_handler_class_default(self):
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return AuthenticatedFileHandler
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@default('files_handler_params')
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def _files_handler_params_default(self):
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return {'path': self.root_dir}
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def is_hidden(self, path):
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"""Does the API style path correspond to a hidden directory or file?
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Parameters
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----------
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path : string
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The path to check. This is an API path (`/` separated,
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relative to root_dir).
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Returns
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-------
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hidden : bool
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Whether the path exists and is hidden.
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"""
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path = path.strip('/')
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os_path = self._get_os_path(path=path)
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return is_hidden(os_path, self.root_dir)
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def file_exists(self, path):
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"""Returns True if the file exists, else returns False.
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API-style wrapper for os.path.isfile
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Parameters
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----------
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path : string
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The relative path to the file (with '/' as separator)
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Returns
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-------
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exists : bool
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Whether the file exists.
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"""
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path = path.strip('/')
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os_path = self._get_os_path(path)
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return os.path.isfile(os_path)
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def dir_exists(self, path):
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"""Does the API-style path refer to an extant directory?
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API-style wrapper for os.path.isdir
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Parameters
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----------
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path : string
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The path to check. This is an API path (`/` separated,
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relative to root_dir).
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Returns
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-------
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exists : bool
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Whether the path is indeed a directory.
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"""
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path = path.strip('/')
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os_path = self._get_os_path(path=path)
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return os.path.isdir(os_path)
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def exists(self, path):
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"""Returns True if the path exists, else returns False.
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API-style wrapper for os.path.exists
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Parameters
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----------
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path : string
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The API path to the file (with '/' as separator)
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Returns
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-------
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exists : bool
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Whether the target exists.
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"""
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path = path.strip('/')
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os_path = self._get_os_path(path=path)
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return exists(os_path)
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def _base_model(self, path):
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"""Build the common base of a contents model"""
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os_path = self._get_os_path(path)
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info = os.lstat(os_path)
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try:
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# size of file
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size = info.st_size
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except (ValueError, OSError):
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self.log.warning('Unable to get size.')
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size = None
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try:
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last_modified = tz.utcfromtimestamp(info.st_mtime)
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except (ValueError, OSError):
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# Files can rarely have an invalid timestamp
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# https://github.com/jupyter/notebook/issues/2539
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# https://github.com/jupyter/notebook/issues/2757
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# Use the Unix epoch as a fallback so we don't crash.
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self.log.warning('Invalid mtime %s for %s', info.st_mtime, os_path)
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last_modified = datetime(1970, 1, 1, 0, 0, tzinfo=tz.UTC)
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try:
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created = tz.utcfromtimestamp(info.st_ctime)
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except (ValueError, OSError): # See above
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self.log.warning('Invalid ctime %s for %s', info.st_ctime, os_path)
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created = datetime(1970, 1, 1, 0, 0, tzinfo=tz.UTC)
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# Create the base model.
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model = {}
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model['name'] = path.rsplit('/', 1)[-1]
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model['path'] = path
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model['last_modified'] = last_modified
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model['created'] = created
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model['content'] = None
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model['format'] = None
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model['mimetype'] = None
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model['size'] = size
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try:
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model['writable'] = os.access(os_path, os.W_OK)
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except OSError:
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self.log.error("Failed to check write permissions on %s", os_path)
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model['writable'] = False
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return model
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def _dir_model(self, path, content=True):
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"""Build a model for a directory
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if content is requested, will include a listing of the directory
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"""
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os_path = self._get_os_path(path)
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four_o_four = u'directory does not exist: %r' % path
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if not os.path.isdir(os_path):
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raise web.HTTPError(404, four_o_four)
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elif is_hidden(os_path, self.root_dir) and not self.allow_hidden:
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self.log.info("Refusing to serve hidden directory %r, via 404 Error",
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os_path
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)
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raise web.HTTPError(404, four_o_four)
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model = self._base_model(path)
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model['type'] = 'directory'
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model['size'] = None
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if content:
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model['content'] = contents = []
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os_dir = self._get_os_path(path)
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for name in os.listdir(os_dir):
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try:
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os_path = os.path.join(os_dir, name)
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except UnicodeDecodeError as e:
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self.log.warning(
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"failed to decode filename '%s': %s", name, e)
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continue
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try:
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st = os.lstat(os_path)
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except OSError as e:
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# skip over broken symlinks in listing
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if e.errno == errno.ENOENT:
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self.log.warning("%s doesn't exist", os_path)
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else:
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self.log.warning("Error stat-ing %s: %s", os_path, e)
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continue
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if (not stat.S_ISLNK(st.st_mode)
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and not stat.S_ISREG(st.st_mode)
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and not stat.S_ISDIR(st.st_mode)):
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self.log.debug("%s not a regular file", os_path)
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continue
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try:
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if self.should_list(name):
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if self.allow_hidden or not is_file_hidden(os_path, stat_res=st):
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contents.append(
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self.get(path='%s/%s' % (path, name), content=False)
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)
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except OSError as e:
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# ELOOP: recursive symlink
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if e.errno != errno.ELOOP:
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self.log.warning(
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"Unknown error checking if file %r is hidden",
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os_path,
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exc_info=True,
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)
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model['format'] = 'json'
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return model
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def _file_model(self, path, content=True, format=None):
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"""Build a model for a file
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if content is requested, include the file contents.
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format:
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If 'text', the contents will be decoded as UTF-8.
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If 'base64', the raw bytes contents will be encoded as base64.
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If not specified, try to decode as UTF-8, and fall back to base64
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"""
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model = self._base_model(path)
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model['type'] = 'file'
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os_path = self._get_os_path(path)
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model['mimetype'] = mimetypes.guess_type(os_path)[0]
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if content:
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content, format = self._read_file(os_path, format)
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if model['mimetype'] is None:
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default_mime = {
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'text': 'text/plain',
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'base64': 'application/octet-stream'
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}[format]
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model['mimetype'] = default_mime
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model.update(
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content=content,
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format=format,
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)
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return model
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def _notebook_model(self, path, content=True):
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"""Build a notebook model
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if content is requested, the notebook content will be populated
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as a JSON structure (not double-serialized)
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"""
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model = self._base_model(path)
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model['type'] = 'notebook'
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os_path = self._get_os_path(path)
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if content:
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nb = self._read_notebook(os_path, as_version=4)
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self.mark_trusted_cells(nb, path)
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model['content'] = nb
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model['format'] = 'json'
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self.validate_notebook_model(model)
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return model
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def get(self, path, content=True, type=None, format=None):
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""" Takes a path for an entity and returns its model
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Parameters
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----------
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path : str
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the API path that describes the relative path for the target
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content : bool
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Whether to include the contents in the reply
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type : str, optional
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The requested type - 'file', 'notebook', or 'directory'.
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Will raise HTTPError 400 if the content doesn't match.
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format : str, optional
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The requested format for file contents. 'text' or 'base64'.
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Ignored if this returns a notebook or directory model.
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Returns
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-------
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model : dict
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the contents model. If content=True, returns the contents
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of the file or directory as well.
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"""
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path = path.strip('/')
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if not self.exists(path):
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raise web.HTTPError(404, u'No such file or directory: %s' % path)
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os_path = self._get_os_path(path)
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if os.path.isdir(os_path):
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if type not in (None, 'directory'):
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raise web.HTTPError(400,
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u'%s is a directory, not a %s' % (path, type), reason='bad type')
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model = self._dir_model(path, content=content)
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elif type == 'notebook' or (type is None and path.endswith('.ipynb')):
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model = self._notebook_model(path, content=content)
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else:
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if type == 'directory':
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raise web.HTTPError(400,
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u'%s is not a directory' % path, reason='bad type')
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model = self._file_model(path, content=content, format=format)
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return model
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def _save_directory(self, os_path, model, path=''):
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"""create a directory"""
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if is_hidden(os_path, self.root_dir) and not self.allow_hidden:
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raise web.HTTPError(400, u'Cannot create hidden directory %r' % os_path)
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if not os.path.exists(os_path):
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with self.perm_to_403():
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os.mkdir(os_path)
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elif not os.path.isdir(os_path):
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raise web.HTTPError(400, u'Not a directory: %s' % (os_path))
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else:
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self.log.debug("Directory %r already exists", os_path)
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def save(self, model, path=''):
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"""Save the file model and return the model with no content."""
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path = path.strip('/')
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if 'type' not in model:
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raise web.HTTPError(400, u'No file type provided')
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if 'content' not in model and model['type'] != 'directory':
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raise web.HTTPError(400, u'No file content provided')
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os_path = self._get_os_path(path)
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self.log.debug("Saving %s", os_path)
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self.run_pre_save_hook(model=model, path=path)
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try:
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if model['type'] == 'notebook':
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nb = nbformat.from_dict(model['content'])
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self.check_and_sign(nb, path)
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self._save_notebook(os_path, nb)
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# One checkpoint should always exist for notebooks.
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if not self.checkpoints.list_checkpoints(path):
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self.create_checkpoint(path)
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elif model['type'] == 'file':
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# Missing format will be handled internally by _save_file.
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self._save_file(os_path, model['content'], model.get('format'))
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elif model['type'] == 'directory':
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self._save_directory(os_path, model, path)
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else:
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raise web.HTTPError(400, "Unhandled contents type: %s" % model['type'])
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except web.HTTPError:
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raise
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except Exception as e:
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self.log.error(u'Error while saving file: %s %s', path, e, exc_info=True)
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raise web.HTTPError(500, u'Unexpected error while saving file: %s %s' %
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(path, e)) from e
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validation_message = None
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if model['type'] == 'notebook':
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self.validate_notebook_model(model)
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validation_message = model.get('message', None)
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model = self.get(path, content=False)
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if validation_message:
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model['message'] = validation_message
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self.run_post_save_hook(model=model, os_path=os_path)
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return model
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def delete_file(self, path):
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"""Delete file at path."""
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path = path.strip('/')
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os_path = self._get_os_path(path)
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rm = os.unlink
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if not os.path.exists(os_path):
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raise web.HTTPError(404, u'File or directory does not exist: %s' % os_path)
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def _check_trash(os_path):
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if sys.platform in {'win32', 'darwin'}:
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return True
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# It's a bit more nuanced than this, but until we can better
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# distinguish errors from send2trash, assume that we can only trash
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# files on the same partition as the home directory.
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file_dev = os.stat(os_path).st_dev
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|
home_dev = os.stat(os.path.expanduser('~')).st_dev
|
|
return file_dev == home_dev
|
|
|
|
def is_non_empty_dir(os_path):
|
|
if os.path.isdir(os_path):
|
|
# A directory containing only leftover checkpoints is
|
|
# considered empty.
|
|
cp_dir = getattr(self.checkpoints, 'checkpoint_dir', None)
|
|
if set(os.listdir(os_path)) - {cp_dir}:
|
|
return True
|
|
|
|
return False
|
|
|
|
if self.delete_to_trash:
|
|
if sys.platform == 'win32' and is_non_empty_dir(os_path):
|
|
# send2trash can really delete files on Windows, so disallow
|
|
# deleting non-empty files. See Github issue 3631.
|
|
raise web.HTTPError(400, u'Directory %s not empty' % os_path)
|
|
if _check_trash(os_path):
|
|
self.log.debug("Sending %s to trash", os_path)
|
|
# Looking at the code in send2trash, I don't think the errors it
|
|
# raises let us distinguish permission errors from other errors in
|
|
# code. So for now, just let them all get logged as server errors.
|
|
send2trash(os_path)
|
|
return
|
|
else:
|
|
self.log.warning("Skipping trash for %s, on different device "
|
|
"to home directory", os_path)
|
|
|
|
if os.path.isdir(os_path):
|
|
# Don't permanently delete non-empty directories.
|
|
if is_non_empty_dir(os_path):
|
|
raise web.HTTPError(400, u'Directory %s not empty' % os_path)
|
|
self.log.debug("Removing directory %s", os_path)
|
|
with self.perm_to_403():
|
|
shutil.rmtree(os_path)
|
|
else:
|
|
self.log.debug("Unlinking file %s", os_path)
|
|
with self.perm_to_403():
|
|
rm(os_path)
|
|
|
|
def rename_file(self, old_path, new_path):
|
|
"""Rename a file."""
|
|
old_path = old_path.strip('/')
|
|
new_path = new_path.strip('/')
|
|
if new_path == old_path:
|
|
return
|
|
|
|
# Perform path validation prior to converting to os-specific value since this
|
|
# is still relative to root_dir.
|
|
self._validate_path(new_path)
|
|
|
|
new_os_path = self._get_os_path(new_path)
|
|
old_os_path = self._get_os_path(old_path)
|
|
|
|
# Should we proceed with the move?
|
|
if os.path.exists(new_os_path) and not samefile(old_os_path, new_os_path):
|
|
raise web.HTTPError(409, u'File already exists: %s' % new_path)
|
|
|
|
# Move the file
|
|
try:
|
|
with self.perm_to_403():
|
|
shutil.move(old_os_path, new_os_path)
|
|
except web.HTTPError:
|
|
raise
|
|
except Exception as e:
|
|
raise web.HTTPError(500, u'Unknown error renaming file: %s %s' %
|
|
(old_path, e)) from e
|
|
|
|
def info_string(self):
|
|
return _("Serving notebooks from local directory: %s") % self.root_dir
|
|
|
|
def get_kernel_path(self, path, model=None):
|
|
"""Return the initial API path of a kernel associated with a given notebook"""
|
|
if self.dir_exists(path):
|
|
return path
|
|
if '/' in path:
|
|
parent_dir = path.rsplit('/', 1)[0]
|
|
else:
|
|
parent_dir = ''
|
|
return parent_dir
|
|
|
|
@staticmethod
|
|
def _validate_path(path):
|
|
"""Checks if the path contains invalid characters relative to the current platform"""
|
|
|
|
if sys.platform == 'win32':
|
|
# On Windows systems, we MUST disallow colons otherwise an Alternative Data Stream will
|
|
# be created and confusion will reign! (See https://github.com/jupyter/notebook/issues/5190)
|
|
# Go ahead and add other invalid (and non-path-separator) characters here as well so there's
|
|
# consistent behavior - although all others will result in '[Errno 22]Invalid Argument' errors.
|
|
invalid_chars = '?:><*"|'
|
|
else:
|
|
# On non-windows systems, allow the underlying file creation to perform enforcement when appropriate
|
|
invalid_chars = ''
|
|
|
|
for char in invalid_chars:
|
|
if char in path:
|
|
raise web.HTTPError(400, "Path '{}' contains characters that are invalid for the filesystem. "
|
|
"Path names on this filesystem cannot contain any of the following "
|
|
"characters: {}".format(path, invalid_chars))
|