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"""A base class for contents managers."""
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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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from fnmatch import fnmatch
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import itertools
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import json
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import os
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import re
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from tornado.web import HTTPError
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from IPython.config.configurable import LoggingConfigurable
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from IPython.nbformat import sign, validate, ValidationError
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from IPython.nbformat.v4 import new_notebook
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from IPython.utils.importstring import import_item
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from IPython.utils.traitlets import Instance, Unicode, List, Any, TraitError
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from IPython.utils.py3compat import string_types
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copy_pat = re.compile(r'\-Copy\d*\.')
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class ContentsManager(LoggingConfigurable):
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"""Base class for serving files and directories.
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This serves any text or binary file,
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as well as directories,
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with special handling for JSON notebook documents.
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Most APIs take a path argument,
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which is always an API-style unicode path,
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and always refers to a directory.
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- unicode, not url-escaped
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- '/'-separated
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- leading and trailing '/' will be stripped
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- if unspecified, path defaults to '',
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indicating the root path.
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"""
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notary = Instance(sign.NotebookNotary)
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def _notary_default(self):
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return sign.NotebookNotary(parent=self)
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hide_globs = List(Unicode, [
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u'__pycache__', '*.pyc', '*.pyo',
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'.DS_Store', '*.so', '*.dylib', '*~',
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], config=True, help="""
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Glob patterns to hide in file and directory listings.
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""")
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untitled_notebook = Unicode("Untitled", config=True,
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help="The base name used when creating untitled notebooks."
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)
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untitled_file = Unicode("untitled", config=True,
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help="The base name used when creating untitled files."
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)
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untitled_directory = Unicode("Untitled Folder", config=True,
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help="The base name used when creating untitled directories."
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)
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pre_save_hook = Any(None, config=True,
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help="""Python callable or importstring thereof
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To be called on a contents model prior to save.
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This can be used to process the structure,
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such as removing notebook outputs or other side effects that
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should not be saved.
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It will be called as (all arguments passed by keyword):
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hook(path=path, model=model, contents_manager=self)
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model: the model to be saved. Includes file contents.
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modifying this dict will affect the file that is stored.
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path: the API path of the save destination
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contents_manager: this ContentsManager instance
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"""
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)
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def _pre_save_hook_changed(self, name, old, new):
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if new and isinstance(new, string_types):
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self.pre_save_hook = import_item(self.pre_save_hook)
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elif new:
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if not callable(new):
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raise TraitError("pre_save_hook must be callable")
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def run_pre_save_hook(self, model, path, **kwargs):
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"""Run the pre-save hook if defined, and log errors"""
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if self.pre_save_hook:
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try:
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self.log.debug("Running pre-save hook on %s", path)
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self.pre_save_hook(model=model, path=path, contents_manager=self, **kwargs)
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except Exception:
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self.log.error("Pre-save hook failed on %s", path, exc_info=True)
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# ContentsManager API part 1: methods that must be
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# implemented in subclasses.
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def dir_exists(self, path):
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"""Does the API-style path (directory) actually exist?
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Like os.path.isdir
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Override this method in subclasses.
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Parameters
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----------
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path : string
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The path to check
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Returns
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-------
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exists : bool
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Whether the path does indeed exist.
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"""
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raise NotImplementedError
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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 is hidden.
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"""
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raise NotImplementedError
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def file_exists(self, path=''):
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"""Does a file exist at the given path?
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Like os.path.isfile
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Override this method in subclasses.
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Parameters
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----------
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name : string
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The name of the file you are checking.
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path : string
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The relative path to the file's directory (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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raise NotImplementedError('must be implemented in a subclass')
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def exists(self, path):
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"""Does a file or directory exist at the given path?
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Like os.path.exists
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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's directory (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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return self.file_exists(path) or self.dir_exists(path)
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def get(self, path, content=True, type=None, format=None):
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"""Get the model of a file or directory with or without content."""
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raise NotImplementedError('must be implemented in a subclass')
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def save(self, model, path):
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"""Save the file or directory and return the model with no content.
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Save implementations should call self.run_pre_save_hook(model=model, path=path)
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prior to writing any data.
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"""
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raise NotImplementedError('must be implemented in a subclass')
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def delete(self, path):
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"""Delete file or directory by path."""
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raise NotImplementedError('must be implemented in a subclass')
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def create_checkpoint(self, path):
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"""Create a checkpoint of the current state of a file
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Returns a checkpoint_id for the new checkpoint.
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"""
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raise NotImplementedError("must be implemented in a subclass")
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def list_checkpoints(self, path):
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"""Return a list of checkpoints for a given file"""
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return []
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def restore_checkpoint(self, checkpoint_id, path):
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"""Restore a file from one of its checkpoints"""
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raise NotImplementedError("must be implemented in a subclass")
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def delete_checkpoint(self, checkpoint_id, path):
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"""delete a checkpoint for a file"""
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raise NotImplementedError("must be implemented in a subclass")
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# ContentsManager API part 2: methods that have useable default
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# implementations, but can be overridden in subclasses.
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def update(self, model, path):
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"""Update the file's path
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For use in PATCH requests, to enable renaming a file without
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re-uploading its contents. Only used for renaming at the moment.
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"""
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path = path.strip('/')
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new_path = model.get('path', path).strip('/')
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if path != new_path:
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self.rename(path, new_path)
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model = self.get(new_path, content=False)
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return model
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def info_string(self):
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return "Serving contents"
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def get_kernel_path(self, path, model=None):
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"""Return the API path for the kernel
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KernelManagers can turn this value into a filesystem path,
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or ignore it altogether.
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The default value here will start kernels in the directory of the
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notebook server. FileContentsManager overrides this to use the
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directory containing the notebook.
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"""
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return ''
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def increment_filename(self, filename, path='', insert=''):
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"""Increment a filename until it is unique.
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Parameters
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----------
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filename : unicode
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The name of a file, including extension
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path : unicode
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The API path of the target's directory
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Returns
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-------
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name : unicode
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A filename that is unique, based on the input filename.
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"""
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path = path.strip('/')
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basename, ext = os.path.splitext(filename)
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for i in itertools.count():
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if i:
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insert_i = '{}{}'.format(insert, i)
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else:
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insert_i = ''
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name = u'{basename}{insert}{ext}'.format(basename=basename,
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insert=insert_i, ext=ext)
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if not self.exists(u'{}/{}'.format(path, name)):
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break
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return name
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def validate_notebook_model(self, model):
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"""Add failed-validation message to model"""
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try:
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validate(model['content'])
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except ValidationError as e:
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model['message'] = u'Notebook Validation failed: {}:\n{}'.format(
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e.message, json.dumps(e.instance, indent=1, default=lambda obj: '<UNKNOWN>'),
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)
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return model
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def new_untitled(self, path='', type='', ext=''):
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"""Create a new untitled file or directory in path
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path must be a directory
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File extension can be specified.
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Use `new` to create files with a fully specified path (including filename).
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"""
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path = path.strip('/')
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if not self.dir_exists(path):
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raise HTTPError(404, 'No such directory: %s' % path)
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model = {}
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if type:
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model['type'] = type
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if ext == '.ipynb':
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model.setdefault('type', 'notebook')
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else:
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model.setdefault('type', 'file')
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insert = ''
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if model['type'] == 'directory':
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untitled = self.untitled_directory
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insert = ' '
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elif model['type'] == 'notebook':
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untitled = self.untitled_notebook
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ext = '.ipynb'
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elif model['type'] == 'file':
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untitled = self.untitled_file
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else:
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raise HTTPError(400, "Unexpected model type: %r" % model['type'])
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name = self.increment_filename(untitled + ext, path, insert=insert)
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path = u'{0}/{1}'.format(path, name)
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return self.new(model, path)
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def new(self, model=None, path=''):
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"""Create a new file or directory and return its model with no content.
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To create a new untitled entity in a directory, use `new_untitled`.
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"""
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path = path.strip('/')
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if model is None:
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model = {}
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if path.endswith('.ipynb'):
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model.setdefault('type', 'notebook')
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else:
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model.setdefault('type', 'file')
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# no content, not a directory, so fill out new-file model
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if 'content' not in model and model['type'] != 'directory':
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if model['type'] == 'notebook':
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model['content'] = new_notebook()
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model['format'] = 'json'
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else:
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model['content'] = ''
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model['type'] = 'file'
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model['format'] = 'text'
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model = self.save(model, path)
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return model
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def copy(self, from_path, to_path=None):
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"""Copy an existing file and return its new model.
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If to_path not specified, it will be the parent directory of from_path.
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If to_path is a directory, filename will increment `from_path-Copy#.ext`.
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from_path must be a full path to a file.
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"""
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path = from_path.strip('/')
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if to_path is not None:
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to_path = to_path.strip('/')
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if '/' in path:
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from_dir, from_name = path.rsplit('/', 1)
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else:
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from_dir = ''
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from_name = path
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model = self.get(path)
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model.pop('path', None)
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model.pop('name', None)
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if model['type'] == 'directory':
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raise HTTPError(400, "Can't copy directories")
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if to_path is None:
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to_path = from_dir
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if self.dir_exists(to_path):
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name = copy_pat.sub(u'.', from_name)
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to_name = self.increment_filename(name, to_path, insert='-Copy')
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to_path = u'{0}/{1}'.format(to_path, to_name)
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model = self.save(model, to_path)
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return model
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def log_info(self):
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self.log.info(self.info_string())
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def trust_notebook(self, path):
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"""Explicitly trust a notebook
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Parameters
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----------
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path : string
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The path of a notebook
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"""
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model = self.get(path)
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nb = model['content']
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self.log.warn("Trusting notebook %s", path)
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self.notary.mark_cells(nb, True)
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self.save(model, path)
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def check_and_sign(self, nb, path=''):
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"""Check for trusted cells, and sign the notebook.
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Called as a part of saving notebooks.
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Parameters
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----------
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nb : dict
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The notebook dict
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path : string
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The notebook's path (for logging)
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"""
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if self.notary.check_cells(nb):
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self.notary.sign(nb)
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else:
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self.log.warn("Saving untrusted notebook %s", path)
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def mark_trusted_cells(self, nb, path=''):
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"""Mark cells as trusted if the notebook signature matches.
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Called as a part of loading notebooks.
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Parameters
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----------
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nb : dict
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The notebook object (in current nbformat)
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path : string
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The notebook's path (for logging)
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"""
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trusted = self.notary.check_signature(nb)
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if not trusted:
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self.log.warn("Notebook %s is not trusted", path)
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self.notary.mark_cells(nb, trusted)
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def should_list(self, name):
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"""Should this file/directory name be displayed in a listing?"""
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return not any(fnmatch(name, glob) for glob in self.hide_globs)
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