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# GNU MediaGoblin -- federated, autonomous media hosting
# Copyright (C) 2011, 2012 MediaGoblin contributors. See AUTHORS.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from mediagoblin.storage import (
StorageInterface,
clean_listy_filepath,
NoWebServing)
import os
import shutil
import urlparse
class BasicFileStorage(StorageInterface):
"""
Basic local filesystem implementation of storage API
"""
local_storage = True
def __init__(self, base_dir, base_url=None, **kwargs):
"""
Keyword arguments:
- base_dir: Base directory things will be served out of. MUST
be an absolute path.
- base_url: URL files will be served from
"""
self.base_dir = base_dir
self.base_url = base_url
def _resolve_filepath(self, filepath):
"""
Transform the given filepath into a local filesystem filepath.
"""
return os.path.join(
self.base_dir, *clean_listy_filepath(filepath))
def file_exists(self, filepath):
return os.path.exists(self._resolve_filepath(filepath))
def get_file(self, filepath, mode='r'):
# Make directories if necessary
if len(filepath) > 1:
directory = self._resolve_filepath(filepath[:-1])
if not os.path.exists(directory):
os.makedirs(directory)
# Grab and return the file in the mode specified
return open(self._resolve_filepath(filepath), mode)
def delete_file(self, filepath):
# TODO: Also delete unused directories if empty (safely, with
# checks to avoid race conditions).
os.remove(self._resolve_filepath(filepath))
def file_url(self, filepath):
if not self.base_url:
raise NoWebServing(
"base_url not set, cannot provide file urls")
return urlparse.urljoin(
self.base_url,
'/'.join(clean_listy_filepath(filepath)))
def get_local_path(self, filepath):
return self._resolve_filepath(filepath)
def copy_local_to_storage(self, filename, filepath):
"""
Copy this file from locally to the storage system.
"""
# Make directories if necessary
if len(filepath) > 1:
directory = self._resolve_filepath(filepath[:-1])
if not os.path.exists(directory):
os.makedirs(directory)
shutil.copy(
filename, self.get_local_path(filepath))
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