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# Dropbox storage class for Django pluggable storage system.
# Author: Anthony Monthe <anthony.monthe@gmail.com>
# License: BSD
#
# Usage:
#
# Add below to settings.py:
# DROPBOX_OAUTH2_TOKEN = 'YourOauthToken'
# DROPBOX_ROOT_PATH = '/dir/'
from io import BytesIO
from shutil import copyfileobj
from tempfile import SpooledTemporaryFile
from django.core.exceptions import ImproperlyConfigured
from django.core.files.base import File
from django.core.files.storage import Storage
from django.utils._os import safe_join
from django.utils.deconstruct import deconstructible
from dropbox import Dropbox
from dropbox.exceptions import ApiError
from dropbox.files import (
CommitInfo, FolderMetadata, UploadSessionCursor, WriteMode,
)
from storages.utils import get_available_overwrite_name, setting
_DEFAULT_TIMEOUT = 100
_DEFAULT_MODE = 'add'
class DropBoxStorageException(Exception):
pass
class DropBoxFile(File):
def __init__(self, name, storage):
self.name = name
self._storage = storage
self._file = None
def _get_file(self):
if self._file is None:
self._file = SpooledTemporaryFile()
# As dropbox==9.3.0, the client returns a tuple
# (dropbox.files.FileMetadata, requests.models.Response)
file_metadata, response = \
self._storage.client.files_download(self.name)
if response.status_code == 200:
with BytesIO(response.content) as file_content:
copyfileobj(file_content, self._file)
else:
# JIC the exception isn't catched by the dropbox client
raise DropBoxStorageException(
"Dropbox server returned a {} response when accessing {}"
.format(response.status_code, self.name)
)
self._file.seek(0)
return self._file
def _set_file(self, value):
self._file = value
file = property(_get_file, _set_file)
@deconstructible
class DropBoxStorage(Storage):
"""DropBox Storage class for Django pluggable storage system."""
location = setting('DROPBOX_ROOT_PATH', '/')
oauth2_access_token = setting('DROPBOX_OAUTH2_TOKEN')
timeout = setting('DROPBOX_TIMEOUT', _DEFAULT_TIMEOUT)
write_mode = setting('DROPBOX_WRITE_MODE', _DEFAULT_MODE)
CHUNK_SIZE = 4 * 1024 * 1024
def __init__(self, oauth2_access_token=oauth2_access_token, root_path=location, timeout=timeout,
write_mode=write_mode):
if oauth2_access_token is None:
raise ImproperlyConfigured("You must configure an auth token at"
"'settings.DROPBOX_OAUTH2_TOKEN'.")
self.root_path = root_path
self.write_mode = write_mode
self.client = Dropbox(oauth2_access_token, timeout=timeout)
def _full_path(self, name):
if name == '/':
name = ''
return safe_join(self.root_path, name).replace('\\', '/')
def delete(self, name):
self.client.files_delete(self._full_path(name))
def exists(self, name):
try:
return bool(self.client.files_get_metadata(self._full_path(name)))
except ApiError:
return False
def listdir(self, path):
directories, files = [], []
full_path = self._full_path(path)
if full_path == '/':
full_path = ''
metadata = self.client.files_list_folder(full_path)
for entry in metadata.entries:
if isinstance(entry, FolderMetadata):
directories.append(entry.name)
else:
files.append(entry.name)
return directories, files
def size(self, name):
metadata = self.client.files_get_metadata(self._full_path(name))
return metadata.size
def modified_time(self, name):
metadata = self.client.files_get_metadata(self._full_path(name))
return metadata.server_modified
def accessed_time(self, name):
metadata = self.client.files_get_metadata(self._full_path(name))
return metadata.client_modified
def url(self, name):
media = self.client.files_get_temporary_link(self._full_path(name))
return media.link
def _open(self, name, mode='rb'):
remote_file = DropBoxFile(self._full_path(name), self)
return remote_file
def _save(self, name, content):
content.open()
if content.size <= self.CHUNK_SIZE:
self.client.files_upload(content.read(), self._full_path(name), mode=WriteMode(self.write_mode))
else:
self._chunked_upload(content, self._full_path(name))
content.close()
return name
def _chunked_upload(self, content, dest_path):
upload_session = self.client.files_upload_session_start(
content.read(self.CHUNK_SIZE)
)
cursor = UploadSessionCursor(
session_id=upload_session.session_id,
offset=content.tell()
)
commit = CommitInfo(path=dest_path, mode=WriteMode(self.write_mode))
while content.tell() < content.size:
if (content.size - content.tell()) <= self.CHUNK_SIZE:
self.client.files_upload_session_finish(
content.read(self.CHUNK_SIZE), cursor, commit
)
else:
self.client.files_upload_session_append_v2(
content.read(self.CHUNK_SIZE), cursor
)
cursor.offset = content.tell()
def get_available_name(self, name, max_length=None):
"""Overwrite existing file with the same name."""
name = self._full_path(name)
if self.write_mode == 'overwrite':
return get_available_overwrite_name(name, max_length)
return super().get_available_name(name, max_length)
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