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"""A contents manager that uses the local file system for storage."""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import base64
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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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from contextlib import contextmanager
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import mimetypes
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from tornado import web
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from .manager import ContentsManager
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from IPython import nbformat
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from IPython.utils.io import atomic_writing
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from IPython.utils.importstring import import_item
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from IPython.utils.path import ensure_dir_exists
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from IPython.utils.traitlets import Any, Unicode, Bool, TraitError
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from IPython.utils.py3compat import getcwd, str_to_unicode, string_types
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from IPython.utils import tz
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from IPython.html.utils import is_hidden, to_os_path, to_api_path
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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 `ipython notebook --script`
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"""
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from IPython.nbconvert.exporters.script import ScriptExporter
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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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py_fname = base + '.py'
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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(ContentsManager):
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root_dir = Unicode(config=True)
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def _root_dir_default(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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@contextmanager
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def perm_to_403(self, os_path=''):
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"""context manager for turning permission errors into 403"""
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try:
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yield
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except OSError as e:
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if e.errno in {errno.EPERM, errno.EACCES}:
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# make 403 error message without root prefix
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# this may not work perfectly on unicode paths on Python 2,
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# but nobody should be doing that anyway.
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if not os_path:
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os_path = str_to_unicode(e.filename or 'unknown file')
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path = to_api_path(os_path, self.root_dir)
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raise web.HTTPError(403, u'Permission denied: %s' % path)
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else:
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raise
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@contextmanager
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def open(self, os_path, *args, **kwargs):
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"""wrapper around io.open that turns permission errors into 403"""
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with self.perm_to_403(os_path):
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with io.open(os_path, *args, **kwargs) as f:
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yield f
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@contextmanager
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def atomic_writing(self, os_path, *args, **kwargs):
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"""wrapper around atomic_writing that turns permission errors into 403"""
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with self.perm_to_403(os_path):
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with atomic_writing(os_path, *args, **kwargs) as f:
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yield f
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save_script = Bool(False, config=True, help='DEPRECATED, use post_save_hook')
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def _save_script_changed(self):
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self.log.warn("""
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`--script` is deprecated. 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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ipython 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,
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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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def _post_save_hook_changed(self, name, old, new):
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if new and isinstance(new, string_types):
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self.post_save_hook = import_item(self.post_save_hook)
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elif new:
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if not callable(new):
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raise TraitError("post_save_hook must be callable")
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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:
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self.log.error("Post-save hook failed on %s", os_path, exc_info=True)
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def _root_dir_changed(self, name, old, new):
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"""Do a bit of validation of the root_dir."""
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if not os.path.isabs(new):
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# If we receive a non-absolute path, make it absolute.
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self.root_dir = os.path.abspath(new)
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return
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if not os.path.isdir(new):
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raise TraitError("%r is not a directory" % new)
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checkpoint_dir = Unicode('.ipynb_checkpoints', config=True,
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help="""The directory name in which to keep file checkpoints
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This is a path relative to the file's own directory.
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By default, it is .ipynb_checkpoints
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"""
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)
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def _copy(self, src, dest):
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"""copy src to dest
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like shutil.copy2, but log errors in copystat
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"""
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shutil.copyfile(src, dest)
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try:
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shutil.copystat(src, dest)
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except OSError as e:
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self.log.debug("copystat on %s failed", dest, exc_info=True)
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def _get_os_path(self, path):
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"""Given an API path, return its file system path.
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Parameters
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----------
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path : string
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The relative API path to the named file.
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Returns
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-------
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path : string
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Native, absolute OS path to for a file.
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"""
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return to_os_path(path, self.root_dir)
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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 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 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 os.path.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.stat(os_path)
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last_modified = tz.utcfromtimestamp(info.st_mtime)
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created = tz.utcfromtimestamp(info.st_ctime)
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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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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):
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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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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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os_path = os.path.join(os_dir, name)
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# skip over broken symlinks in listing
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if not os.path.exists(os_path):
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self.log.warn("%s doesn't exist", os_path)
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continue
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elif not os.path.isfile(os_path) and not os.path.isdir(os_path):
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self.log.debug("%s not a regular file", os_path)
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continue
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if self.should_list(name) and not is_hidden(os_path, self.root_dir):
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contents.append(self.get(
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path='%s/%s' % (path, name),
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content=False)
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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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if content:
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if not os.path.isfile(os_path):
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# could be FIFO
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raise web.HTTPError(400, "Cannot get content of non-file %s" % os_path)
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with self.open(os_path, 'rb') as f:
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bcontent = f.read()
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if format != 'base64':
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try:
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model['content'] = bcontent.decode('utf8')
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except UnicodeError as e:
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if format == 'text':
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raise web.HTTPError(400, "%s is not UTF-8 encoded" % path, reason='bad format')
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else:
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model['format'] = 'text'
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default_mime = 'text/plain'
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if model['content'] is None:
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model['content'] = base64.encodestring(bcontent).decode('ascii')
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model['format'] = 'base64'
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if model['format'] == 'base64':
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default_mime = 'application/octet-stream'
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model['mimetype'] = mimetypes.guess_type(os_path)[0] or default_mime
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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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if content:
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os_path = self._get_os_path(path)
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with self.open(os_path, 'r', encoding='utf-8') as f:
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try:
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nb = nbformat.read(f, as_version=4)
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except Exception as e:
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raise web.HTTPError(400, u"Unreadable Notebook: %s %r" % (os_path, e))
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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', 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_notebook(self, os_path, model, path=''):
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"""save a notebook file"""
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# Save the notebook file
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nb = nbformat.from_dict(model['content'])
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self.check_and_sign(nb, path)
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with self.atomic_writing(os_path, encoding='utf-8') as f:
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nbformat.write(nb, f, version=nbformat.NO_CONVERT)
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def _save_file(self, os_path, model, path=''):
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"""save a non-notebook file"""
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|
|
fmt = model.get('format', None)
|
|
|
if fmt not in {'text', 'base64'}:
|
|
|
raise web.HTTPError(400, "Must specify format of file contents as 'text' or 'base64'")
|
|
|
try:
|
|
|
content = model['content']
|
|
|
if fmt == 'text':
|
|
|
bcontent = content.encode('utf8')
|
|
|
else:
|
|
|
b64_bytes = content.encode('ascii')
|
|
|
bcontent = base64.decodestring(b64_bytes)
|
|
|
except Exception as e:
|
|
|
raise web.HTTPError(400, u'Encoding error saving %s: %s' % (os_path, e))
|
|
|
with self.atomic_writing(os_path, text=False) as f:
|
|
|
f.write(bcontent)
|
|
|
|
|
|
def _save_directory(self, os_path, model, path=''):
|
|
|
"""create a directory"""
|
|
|
if is_hidden(os_path, self.root_dir):
|
|
|
raise web.HTTPError(400, u'Cannot create hidden directory %r' % os_path)
|
|
|
if not os.path.exists(os_path):
|
|
|
with self.perm_to_403():
|
|
|
os.mkdir(os_path)
|
|
|
elif not os.path.isdir(os_path):
|
|
|
raise web.HTTPError(400, u'Not a directory: %s' % (os_path))
|
|
|
else:
|
|
|
self.log.debug("Directory %r already exists", os_path)
|
|
|
|
|
|
def save(self, model, path=''):
|
|
|
"""Save the file model and return the model with no content."""
|
|
|
path = path.strip('/')
|
|
|
|
|
|
if 'type' not in model:
|
|
|
raise web.HTTPError(400, u'No file type provided')
|
|
|
if 'content' not in model and model['type'] != 'directory':
|
|
|
raise web.HTTPError(400, u'No file content provided')
|
|
|
|
|
|
self.run_pre_save_hook(model=model, path=path)
|
|
|
|
|
|
# One checkpoint should always exist
|
|
|
if self.file_exists(path) and not self.list_checkpoints(path):
|
|
|
self.create_checkpoint(path)
|
|
|
|
|
|
os_path = self._get_os_path(path)
|
|
|
self.log.debug("Saving %s", os_path)
|
|
|
try:
|
|
|
if model['type'] == 'notebook':
|
|
|
self._save_notebook(os_path, model, path)
|
|
|
elif model['type'] == 'file':
|
|
|
self._save_file(os_path, model, path)
|
|
|
elif model['type'] == 'directory':
|
|
|
self._save_directory(os_path, model, path)
|
|
|
else:
|
|
|
raise web.HTTPError(400, "Unhandled contents type: %s" % model['type'])
|
|
|
except web.HTTPError:
|
|
|
raise
|
|
|
except Exception as e:
|
|
|
self.log.error(u'Error while saving file: %s %s', path, e, exc_info=True)
|
|
|
raise web.HTTPError(500, u'Unexpected error while saving file: %s %s' % (path, e))
|
|
|
|
|
|
validation_message = None
|
|
|
if model['type'] == 'notebook':
|
|
|
self.validate_notebook_model(model)
|
|
|
validation_message = model.get('message', None)
|
|
|
|
|
|
model = self.get(path, content=False)
|
|
|
if validation_message:
|
|
|
model['message'] = validation_message
|
|
|
|
|
|
self.run_post_save_hook(model=model, os_path=os_path)
|
|
|
|
|
|
return model
|
|
|
|
|
|
def delete(self, path):
|
|
|
"""Delete file at path."""
|
|
|
path = path.strip('/')
|
|
|
os_path = self._get_os_path(path)
|
|
|
rm = os.unlink
|
|
|
if os.path.isdir(os_path):
|
|
|
listing = os.listdir(os_path)
|
|
|
# don't delete non-empty directories (checkpoints dir doesn't count)
|
|
|
if listing and listing != [self.checkpoint_dir]:
|
|
|
raise web.HTTPError(400, u'Directory %s not empty' % os_path)
|
|
|
elif not os.path.isfile(os_path):
|
|
|
raise web.HTTPError(404, u'File does not exist: %s' % os_path)
|
|
|
|
|
|
# clear checkpoints
|
|
|
for checkpoint in self.list_checkpoints(path):
|
|
|
checkpoint_id = checkpoint['id']
|
|
|
cp_path = self.get_checkpoint_path(checkpoint_id, path)
|
|
|
if os.path.isfile(cp_path):
|
|
|
self.log.debug("Unlinking checkpoint %s", cp_path)
|
|
|
with self.perm_to_403():
|
|
|
rm(cp_path)
|
|
|
|
|
|
if os.path.isdir(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(self, old_path, new_path):
|
|
|
"""Rename a file."""
|
|
|
old_path = old_path.strip('/')
|
|
|
new_path = new_path.strip('/')
|
|
|
if new_path == old_path:
|
|
|
return
|
|
|
|
|
|
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):
|
|
|
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))
|
|
|
|
|
|
# Move the checkpoints
|
|
|
old_checkpoints = self.list_checkpoints(old_path)
|
|
|
for cp in old_checkpoints:
|
|
|
checkpoint_id = cp['id']
|
|
|
old_cp_path = self.get_checkpoint_path(checkpoint_id, old_path)
|
|
|
new_cp_path = self.get_checkpoint_path(checkpoint_id, new_path)
|
|
|
if os.path.isfile(old_cp_path):
|
|
|
self.log.debug("Renaming checkpoint %s -> %s", old_cp_path, new_cp_path)
|
|
|
with self.perm_to_403():
|
|
|
shutil.move(old_cp_path, new_cp_path)
|
|
|
|
|
|
# Checkpoint-related utilities
|
|
|
|
|
|
def get_checkpoint_path(self, checkpoint_id, path):
|
|
|
"""find the path to a checkpoint"""
|
|
|
path = path.strip('/')
|
|
|
parent, name = ('/' + path).rsplit('/', 1)
|
|
|
parent = parent.strip('/')
|
|
|
basename, ext = os.path.splitext(name)
|
|
|
filename = u"{name}-{checkpoint_id}{ext}".format(
|
|
|
name=basename,
|
|
|
checkpoint_id=checkpoint_id,
|
|
|
ext=ext,
|
|
|
)
|
|
|
os_path = self._get_os_path(path=parent)
|
|
|
cp_dir = os.path.join(os_path, self.checkpoint_dir)
|
|
|
with self.perm_to_403():
|
|
|
ensure_dir_exists(cp_dir)
|
|
|
cp_path = os.path.join(cp_dir, filename)
|
|
|
return cp_path
|
|
|
|
|
|
def get_checkpoint_model(self, checkpoint_id, path):
|
|
|
"""construct the info dict for a given checkpoint"""
|
|
|
path = path.strip('/')
|
|
|
cp_path = self.get_checkpoint_path(checkpoint_id, path)
|
|
|
stats = os.stat(cp_path)
|
|
|
last_modified = tz.utcfromtimestamp(stats.st_mtime)
|
|
|
info = dict(
|
|
|
id = checkpoint_id,
|
|
|
last_modified = last_modified,
|
|
|
)
|
|
|
return info
|
|
|
|
|
|
# public checkpoint API
|
|
|
|
|
|
def create_checkpoint(self, path):
|
|
|
"""Create a checkpoint from the current state of a file"""
|
|
|
path = path.strip('/')
|
|
|
if not self.file_exists(path):
|
|
|
raise web.HTTPError(404)
|
|
|
src_path = self._get_os_path(path)
|
|
|
# only the one checkpoint ID:
|
|
|
checkpoint_id = u"checkpoint"
|
|
|
cp_path = self.get_checkpoint_path(checkpoint_id, path)
|
|
|
self.log.debug("creating checkpoint for %s", path)
|
|
|
with self.perm_to_403():
|
|
|
self._copy(src_path, cp_path)
|
|
|
|
|
|
# return the checkpoint info
|
|
|
return self.get_checkpoint_model(checkpoint_id, path)
|
|
|
|
|
|
def list_checkpoints(self, path):
|
|
|
"""list the checkpoints for a given file
|
|
|
|
|
|
This contents manager currently only supports one checkpoint per file.
|
|
|
"""
|
|
|
path = path.strip('/')
|
|
|
checkpoint_id = "checkpoint"
|
|
|
os_path = self.get_checkpoint_path(checkpoint_id, path)
|
|
|
if not os.path.exists(os_path):
|
|
|
return []
|
|
|
else:
|
|
|
return [self.get_checkpoint_model(checkpoint_id, path)]
|
|
|
|
|
|
|
|
|
def restore_checkpoint(self, checkpoint_id, path):
|
|
|
"""restore a file to a checkpointed state"""
|
|
|
path = path.strip('/')
|
|
|
self.log.info("restoring %s from checkpoint %s", path, checkpoint_id)
|
|
|
nb_path = self._get_os_path(path)
|
|
|
cp_path = self.get_checkpoint_path(checkpoint_id, path)
|
|
|
if not os.path.isfile(cp_path):
|
|
|
self.log.debug("checkpoint file does not exist: %s", cp_path)
|
|
|
raise web.HTTPError(404,
|
|
|
u'checkpoint does not exist: %s@%s' % (path, checkpoint_id)
|
|
|
)
|
|
|
# ensure notebook is readable (never restore from an unreadable notebook)
|
|
|
if cp_path.endswith('.ipynb'):
|
|
|
with self.open(cp_path, 'r', encoding='utf-8') as f:
|
|
|
nbformat.read(f, as_version=4)
|
|
|
self.log.debug("copying %s -> %s", cp_path, nb_path)
|
|
|
with self.perm_to_403():
|
|
|
self._copy(cp_path, nb_path)
|
|
|
|
|
|
def delete_checkpoint(self, checkpoint_id, path):
|
|
|
"""delete a file's checkpoint"""
|
|
|
path = path.strip('/')
|
|
|
cp_path = self.get_checkpoint_path(checkpoint_id, path)
|
|
|
if not os.path.isfile(cp_path):
|
|
|
raise web.HTTPError(404,
|
|
|
u'Checkpoint does not exist: %s@%s' % (path, checkpoint_id)
|
|
|
)
|
|
|
self.log.debug("unlinking %s", cp_path)
|
|
|
os.unlink(cp_path)
|
|
|
|
|
|
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 '/' in path:
|
|
|
parent_dir = path.rsplit('/', 1)[0]
|
|
|
else:
|
|
|
parent_dir = ''
|
|
|
return parent_dir
|
|
|
|
