"""A contents manager that uses the local file system for storage.""" # Copyright (c) IPython Development Team. # Distributed under the terms of the Modified BSD License. import base64 import io import os import glob import shutil from tornado import web from .manager import ContentsManager from IPython import nbformat from IPython.utils.io import atomic_writing from IPython.utils.path import ensure_dir_exists from IPython.utils.traitlets import Unicode, Bool, TraitError from IPython.utils.py3compat import getcwd from IPython.utils import tz from IPython.html.utils import is_hidden, to_os_path, url_path_join class FileContentsManager(ContentsManager): root_dir = Unicode(getcwd(), config=True) save_script = Bool(False, config=True, help='DEPRECATED, IGNORED') def _save_script_changed(self): self.log.warn(""" Automatically saving notebooks as scripts has been removed. Use `ipython nbconvert --to python [notebook]` instead. """) def _root_dir_changed(self, name, old, new): """Do a bit of validation of the root_dir.""" if not os.path.isabs(new): # If we receive a non-absolute path, make it absolute. self.root_dir = os.path.abspath(new) return if not os.path.isdir(new): raise TraitError("%r is not a directory" % new) checkpoint_dir = Unicode('.ipynb_checkpoints', config=True, help="""The directory name in which to keep file checkpoints This is a path relative to the file's own directory. By default, it is .ipynb_checkpoints """ ) def _copy(self, src, dest): """copy src to dest like shutil.copy2, but log errors in copystat """ shutil.copyfile(src, dest) try: shutil.copystat(src, dest) except OSError as e: self.log.debug("copystat on %s failed", dest, exc_info=True) def _get_os_path(self, path): """Given an API path, return its file system path. Parameters ---------- path : string The relative API path to the named file. Returns ------- path : string Native, absolute OS path to for a file. """ return to_os_path(path, self.root_dir) def dir_exists(self, path): """Does the API-style path refer to an extant directory? API-style wrapper for os.path.isdir Parameters ---------- path : string The path to check. This is an API path (`/` separated, relative to root_dir). Returns ------- exists : bool Whether the path is indeed a directory. """ path = path.strip('/') os_path = self._get_os_path(path=path) return os.path.isdir(os_path) def is_hidden(self, path): """Does the API style path correspond to a hidden directory or file? Parameters ---------- path : string The path to check. This is an API path (`/` separated, relative to root_dir). Returns ------- hidden : bool Whether the path exists and is hidden. """ path = path.strip('/') os_path = self._get_os_path(path=path) return is_hidden(os_path, self.root_dir) def file_exists(self, path): """Returns True if the file exists, else returns False. API-style wrapper for os.path.isfile Parameters ---------- path : string The relative path to the file (with '/' as separator) Returns ------- exists : bool Whether the file exists. """ path = path.strip('/') os_path = self._get_os_path(path) return os.path.isfile(os_path) def exists(self, path): """Returns True if the path exists, else returns False. API-style wrapper for os.path.exists Parameters ---------- path : string The API path to the file (with '/' as separator) Returns ------- exists : bool Whether the target exists. """ path = path.strip('/') os_path = self._get_os_path(path=path) return os.path.exists(os_path) def _base_model(self, path): """Build the common base of a contents model""" os_path = self._get_os_path(path) info = os.stat(os_path) last_modified = tz.utcfromtimestamp(info.st_mtime) created = tz.utcfromtimestamp(info.st_ctime) # Create the base model. model = {} model['name'] = path.rsplit('/', 1)[-1] model['path'] = path model['last_modified'] = last_modified model['created'] = created model['content'] = None model['format'] = None return model def _dir_model(self, path, content=True): """Build a model for a directory if content is requested, will include a listing of the directory """ os_path = self._get_os_path(path) four_o_four = u'directory does not exist: %r' % os_path if not os.path.isdir(os_path): raise web.HTTPError(404, four_o_four) elif is_hidden(os_path, self.root_dir): self.log.info("Refusing to serve hidden directory %r, via 404 Error", os_path ) raise web.HTTPError(404, four_o_four) model = self._base_model(path) model['type'] = 'directory' if content: model['content'] = contents = [] os_dir = self._get_os_path(path) for name in os.listdir(os_dir): os_path = os.path.join(os_dir, name) # skip over broken symlinks in listing if not os.path.exists(os_path): self.log.warn("%s doesn't exist", os_path) continue elif not os.path.isfile(os_path) and not os.path.isdir(os_path): self.log.debug("%s not a regular file", os_path) continue if self.should_list(name) and not is_hidden(os_path, self.root_dir): contents.append(self.get( path='%s/%s' % (path, name), content=False) ) model['format'] = 'json' return model def _file_model(self, path, content=True, format=None): """Build a model for a file if content is requested, include the file contents. format: If 'text', the contents will be decoded as UTF-8. If 'base64', the raw bytes contents will be encoded as base64. If not specified, try to decode as UTF-8, and fall back to base64 """ model = self._base_model(path) model['type'] = 'file' if content: os_path = self._get_os_path(path) if not os.path.isfile(os_path): # could be FIFO raise web.HTTPError(400, "Cannot get content of non-file %s" % os_path) with io.open(os_path, 'rb') as f: bcontent = f.read() if format != 'base64': try: model['content'] = bcontent.decode('utf8') except UnicodeError as e: if format == 'text': raise web.HTTPError(400, "%s is not UTF-8 encoded" % path) else: model['format'] = 'text' if model['content'] is None: model['content'] = base64.encodestring(bcontent).decode('ascii') model['format'] = 'base64' return model def _notebook_model(self, path, content=True): """Build a notebook model if content is requested, the notebook content will be populated as a JSON structure (not double-serialized) """ model = self._base_model(path) model['type'] = 'notebook' if content: os_path = self._get_os_path(path) with io.open(os_path, 'r', encoding='utf-8') as f: try: nb = nbformat.read(f, as_version=4) except Exception as e: raise web.HTTPError(400, u"Unreadable Notebook: %s %r" % (os_path, e)) self.mark_trusted_cells(nb, path) model['content'] = nb model['format'] = 'json' self.validate_notebook_model(model) return model def get(self, path, content=True, type_=None, format=None): """ Takes a path for an entity and returns its model Parameters ---------- path : str the API path that describes the relative path for the target content : bool Whether to include the contents in the reply type_ : str, optional The requested type - 'file', 'notebook', or 'directory'. Will raise HTTPError 400 if the content doesn't match. format : str, optional The requested format for file contents. 'text' or 'base64'. Ignored if this returns a notebook or directory model. Returns ------- model : dict the contents model. If content=True, returns the contents of the file or directory as well. """ path = path.strip('/') if not self.exists(path): raise web.HTTPError(404, u'No such file or directory: %s' % path) os_path = self._get_os_path(path) if os.path.isdir(os_path): if type_ not in (None, 'directory'): raise web.HTTPError(400, u'%s is a directory, not a %s' % (path, type_)) model = self._dir_model(path, content=content) elif type_ == 'notebook' or (type_ is None and path.endswith('.ipynb')): model = self._notebook_model(path, content=content) else: if type_ == 'directory': raise web.HTTPError(400, u'%s is not a directory') model = self._file_model(path, content=content, format=format) return model def _save_notebook(self, os_path, model, path=''): """save a notebook file""" # Save the notebook file nb = nbformat.from_dict(model['content']) self.check_and_sign(nb, path) with atomic_writing(os_path, encoding='utf-8') as f: nbformat.write(nb, f, version=nbformat.NO_CONVERT) def _save_file(self, os_path, model, path=''): """save a non-notebook file""" 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 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): 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') # 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: raise web.HTTPError(400, u'Unexpected error while saving file: %s %s' % (os_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 return model def update(self, model, path): """Update the file's path For use in PATCH requests, to enable renaming a file without re-uploading its contents. Only used for renaming at the moment. """ path = path.strip('/') new_path = model.get('path', path).strip('/') if path != new_path: self.rename(path, new_path) model = self.get(new_path, content=False) 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) os.unlink(cp_path) if os.path.isdir(os_path): self.log.debug("Removing directory %s", os_path) shutil.rmtree(os_path) else: self.log.debug("Unlinking file %s", os_path) 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: shutil.move(old_os_path, new_os_path) 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) 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) 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) 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 io.open(cp_path, 'r', encoding='utf-8') as f: nbformat.read(f, as_version=4) self._copy(cp_path, nb_path) self.log.debug("copying %s -> %s", 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 working dir a kernel associated with a given notebook""" if '/' in path: parent_dir = path.rsplit('/', 1)[0] else: parent_dir = '' return self._get_os_path(parent_dir)