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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 io
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import os
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import glob
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import shutil
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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.path import ensure_dir_exists
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from IPython.utils.traitlets import Unicode, Bool, TraitError
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from IPython.utils.py3compat import getcwd
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from IPython.utils import tz
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from IPython.html.utils import is_hidden, to_os_path, url_path_join
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class FileContentsManager(ContentsManager):
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root_dir = Unicode(getcwd(), config=True)
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save_script = Bool(False, config=True, help='DEPRECATED, IGNORED')
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def _save_script_changed(self):
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self.log.warn("""
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Automatically saving notebooks as scripts has been removed.
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Use `ipython nbconvert --to python [notebook]` instead.
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""")
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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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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' % os_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_model(
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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):
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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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UTF-8 text files will be unicode, binary files will be base64-encoded.
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"""
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model = self._base_model(path)
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model['type'] = 'file'
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if content:
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os_path = self._get_os_path(path)
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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 io.open(os_path, 'rb') as f:
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bcontent = f.read()
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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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model['content'] = base64.encodestring(bcontent).decode('ascii')
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model['format'] = 'base64'
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else:
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model['format'] = 'text'
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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 io.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_model(self, path, content=True):
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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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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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model = self._dir_model(path, content=content)
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elif path.endswith('.ipynb'):
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model = self._notebook_model(path, content=content)
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else:
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model = self._file_model(path, content=content)
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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 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)
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if fmt not in {'text', 'base64'}:
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raise web.HTTPError(400, "Must specify format of file contents as 'text' or 'base64'")
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try:
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content = model['content']
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if fmt == 'text':
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bcontent = content.encode('utf8')
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else:
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b64_bytes = content.encode('ascii')
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bcontent = base64.decodestring(b64_bytes)
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except Exception as e:
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raise web.HTTPError(400, u'Encoding error saving %s: %s' % (os_path, e))
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with atomic_writing(os_path, text=False) as f:
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f.write(bcontent)
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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):
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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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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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# One checkpoint should always exist
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if self.file_exists(path) and not self.list_checkpoints(path):
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self.create_checkpoint(path)
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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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try:
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if model['type'] == 'notebook':
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self._save_notebook(os_path, model, path)
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elif model['type'] == 'file':
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self._save_file(os_path, model, path)
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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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raise web.HTTPError(400, u'Unexpected error while saving file: %s %s' % (os_path, 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_model(path, content=False)
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if validation_message:
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model['message'] = validation_message
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return model
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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_model(new_path, content=False)
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return model
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def delete(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 os.path.isdir(os_path):
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listing = os.listdir(os_path)
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# don't delete non-empty directories (checkpoints dir doesn't count)
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if listing and listing != [self.checkpoint_dir]:
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raise web.HTTPError(400, u'Directory %s not empty' % os_path)
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elif not os.path.isfile(os_path):
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raise web.HTTPError(404, u'File does not exist: %s' % os_path)
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# clear checkpoints
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for checkpoint in self.list_checkpoints(path):
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checkpoint_id = checkpoint['id']
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cp_path = self.get_checkpoint_path(checkpoint_id, path)
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if os.path.isfile(cp_path):
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self.log.debug("Unlinking checkpoint %s", cp_path)
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os.unlink(cp_path)
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if os.path.isdir(os_path):
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self.log.debug("Removing directory %s", os_path)
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shutil.rmtree(os_path)
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else:
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self.log.debug("Unlinking file %s", os_path)
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rm(os_path)
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def rename(self, old_path, new_path):
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"""Rename a file."""
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old_path = old_path.strip('/')
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new_path = new_path.strip('/')
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if new_path == old_path:
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return
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new_os_path = self._get_os_path(new_path)
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old_os_path = self._get_os_path(old_path)
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# Should we proceed with the move?
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if os.path.exists(new_os_path):
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raise web.HTTPError(409, u'File already exists: %s' % new_path)
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# Move the file
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try:
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shutil.move(old_os_path, new_os_path)
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except Exception as e:
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raise web.HTTPError(500, u'Unknown error renaming file: %s %s' % (old_path, e))
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# Move the checkpoints
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old_checkpoints = self.list_checkpoints(old_path)
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for cp in old_checkpoints:
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checkpoint_id = cp['id']
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old_cp_path = self.get_checkpoint_path(checkpoint_id, old_path)
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new_cp_path = self.get_checkpoint_path(checkpoint_id, new_path)
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if os.path.isfile(old_cp_path):
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self.log.debug("Renaming checkpoint %s -> %s", old_cp_path, new_cp_path)
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shutil.move(old_cp_path, new_cp_path)
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# Checkpoint-related utilities
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def get_checkpoint_path(self, checkpoint_id, path):
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"""find the path to a checkpoint"""
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path = path.strip('/')
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parent, name = ('/' + path).rsplit('/', 1)
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parent = parent.strip('/')
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basename, ext = os.path.splitext(name)
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filename = u"{name}-{checkpoint_id}{ext}".format(
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name=basename,
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checkpoint_id=checkpoint_id,
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ext=ext,
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)
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os_path = self._get_os_path(path=parent)
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cp_dir = os.path.join(os_path, self.checkpoint_dir)
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ensure_dir_exists(cp_dir)
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cp_path = os.path.join(cp_dir, filename)
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return cp_path
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def get_checkpoint_model(self, checkpoint_id, path):
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"""construct the info dict for a given checkpoint"""
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path = path.strip('/')
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cp_path = self.get_checkpoint_path(checkpoint_id, path)
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stats = os.stat(cp_path)
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last_modified = tz.utcfromtimestamp(stats.st_mtime)
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info = dict(
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id = checkpoint_id,
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last_modified = last_modified,
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)
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return info
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# public checkpoint API
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def create_checkpoint(self, path):
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"""Create a checkpoint from the current state of a file"""
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path = path.strip('/')
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if not self.file_exists(path):
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raise web.HTTPError(404)
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src_path = self._get_os_path(path)
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# only the one checkpoint ID:
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checkpoint_id = u"checkpoint"
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cp_path = self.get_checkpoint_path(checkpoint_id, path)
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self.log.debug("creating checkpoint for %s", path)
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self._copy(src_path, cp_path)
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# return the checkpoint info
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return self.get_checkpoint_model(checkpoint_id, path)
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def list_checkpoints(self, path):
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"""list the checkpoints for a given file
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This contents manager currently only supports one checkpoint per file.
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"""
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path = path.strip('/')
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checkpoint_id = "checkpoint"
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os_path = self.get_checkpoint_path(checkpoint_id, path)
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if not os.path.exists(os_path):
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return []
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else:
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return [self.get_checkpoint_model(checkpoint_id, path)]
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def restore_checkpoint(self, checkpoint_id, path):
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"""restore a file to a checkpointed state"""
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path = path.strip('/')
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self.log.info("restoring %s from checkpoint %s", path, checkpoint_id)
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nb_path = self._get_os_path(path)
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cp_path = self.get_checkpoint_path(checkpoint_id, path)
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if not os.path.isfile(cp_path):
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self.log.debug("checkpoint file does not exist: %s", cp_path)
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raise web.HTTPError(404,
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u'checkpoint does not exist: %s@%s' % (path, checkpoint_id)
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)
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# ensure notebook is readable (never restore from an unreadable notebook)
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if cp_path.endswith('.ipynb'):
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with io.open(cp_path, 'r', encoding='utf-8') as f:
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nbformat.read(f, as_version=4)
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self._copy(cp_path, nb_path)
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self.log.debug("copying %s -> %s", cp_path, nb_path)
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def delete_checkpoint(self, checkpoint_id, path):
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"""delete a file's checkpoint"""
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path = path.strip('/')
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cp_path = self.get_checkpoint_path(checkpoint_id, path)
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if not os.path.isfile(cp_path):
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raise web.HTTPError(404,
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u'Checkpoint does not exist: %s@%s' % (path, checkpoint_id)
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)
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self.log.debug("unlinking %s", cp_path)
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os.unlink(cp_path)
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def info_string(self):
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return "Serving notebooks from local directory: %s" % self.root_dir
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def get_kernel_path(self, path, model=None):
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"""Return the initial working dir a kernel associated with a given notebook"""
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if '/' in path:
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parent_dir = path.rsplit('/', 1)[0]
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else:
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parent_dir = ''
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return self._get_os_path(parent_dir)
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