--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/app/django/core/files/storage.py Tue Oct 14 16:00:59 2008 +0000
@@ -0,0 +1,231 @@
+import os
+import errno
+import urlparse
+
+from django.conf import settings
+from django.core.exceptions import ImproperlyConfigured, SuspiciousOperation
+from django.utils.encoding import force_unicode
+from django.utils.text import get_valid_filename
+from django.utils._os import safe_join
+from django.core.files import locks, File
+from django.core.files.move import file_move_safe
+
+__all__ = ('Storage', 'FileSystemStorage', 'DefaultStorage', 'default_storage')
+
+class Storage(object):
+ """
+ A base storage class, providing some default behaviors that all other
+ storage systems can inherit or override, as necessary.
+ """
+
+ # The following methods represent a public interface to private methods.
+ # These shouldn't be overridden by subclasses unless absolutely necessary.
+
+ def open(self, name, mode='rb', mixin=None):
+ """
+ Retrieves the specified file from storage, using the optional mixin
+ class to customize what features are available on the File returned.
+ """
+ file = self._open(name, mode)
+ if mixin:
+ # Add the mixin as a parent class of the File returned from storage.
+ file.__class__ = type(mixin.__name__, (mixin, file.__class__), {})
+ return file
+
+ def save(self, name, content):
+ """
+ Saves new content to the file specified by name. The content should be a
+ proper File object, ready to be read from the beginning.
+ """
+ # Get the proper name for the file, as it will actually be saved.
+ if name is None:
+ name = content.name
+
+ name = self.get_available_name(name)
+ name = self._save(name, content)
+
+ # Store filenames with forward slashes, even on Windows
+ return force_unicode(name.replace('\\', '/'))
+
+ # These methods are part of the public API, with default implementations.
+
+ def get_valid_name(self, name):
+ """
+ Returns a filename, based on the provided filename, that's suitable for
+ use in the target storage system.
+ """
+ return get_valid_filename(name)
+
+ def get_available_name(self, name):
+ """
+ Returns a filename that's free on the target storage system, and
+ available for new content to be written to.
+ """
+ # If the filename already exists, keep adding an underscore to the name
+ # of the file until the filename doesn't exist.
+ while self.exists(name):
+ try:
+ dot_index = name.rindex('.')
+ except ValueError: # filename has no dot
+ name += '_'
+ else:
+ name = name[:dot_index] + '_' + name[dot_index:]
+ return name
+
+ def path(self, name):
+ """
+ Returns a local filesystem path where the file can be retrieved using
+ Python's built-in open() function. Storage systems that can't be
+ accessed using open() should *not* implement this method.
+ """
+ raise NotImplementedError("This backend doesn't support absolute paths.")
+
+ # The following methods form the public API for storage systems, but with
+ # no default implementations. Subclasses must implement *all* of these.
+
+ def delete(self, name):
+ """
+ Deletes the specified file from the storage system.
+ """
+ raise NotImplementedError()
+
+ def exists(self, name):
+ """
+ Returns True if a file referened by the given name already exists in the
+ storage system, or False if the name is available for a new file.
+ """
+ raise NotImplementedError()
+
+ def listdir(self, path):
+ """
+ Lists the contents of the specified path, returning a 2-tuple of lists;
+ the first item being directories, the second item being files.
+ """
+ raise NotImplementedError()
+
+ def size(self, name):
+ """
+ Returns the total size, in bytes, of the file specified by name.
+ """
+ raise NotImplementedError()
+
+ def url(self, name):
+ """
+ Returns an absolute URL where the file's contents can be accessed
+ directly by a web browser.
+ """
+ raise NotImplementedError()
+
+class FileSystemStorage(Storage):
+ """
+ Standard filesystem storage
+ """
+
+ def __init__(self, location=settings.MEDIA_ROOT, base_url=settings.MEDIA_URL):
+ self.location = os.path.abspath(location)
+ self.base_url = base_url
+
+ def _open(self, name, mode='rb'):
+ return File(open(self.path(name), mode))
+
+ def _save(self, name, content):
+ full_path = self.path(name)
+
+ directory = os.path.dirname(full_path)
+ if not os.path.exists(directory):
+ os.makedirs(directory)
+ elif not os.path.isdir(directory):
+ raise IOError("%s exists and is not a directory." % directory)
+
+ # There's a potential race condition between get_available_name and
+ # saving the file; it's possible that two threads might return the
+ # same name, at which point all sorts of fun happens. So we need to
+ # try to create the file, but if it already exists we have to go back
+ # to get_available_name() and try again.
+
+ while True:
+ try:
+ # This file has a file path that we can move.
+ if hasattr(content, 'temporary_file_path'):
+ file_move_safe(content.temporary_file_path(), full_path)
+ content.close()
+
+ # This is a normal uploadedfile that we can stream.
+ else:
+ # This fun binary flag incantation makes os.open throw an
+ # OSError if the file already exists before we open it.
+ fd = os.open(full_path, os.O_WRONLY | os.O_CREAT | os.O_EXCL | getattr(os, 'O_BINARY', 0))
+ try:
+ locks.lock(fd, locks.LOCK_EX)
+ for chunk in content.chunks():
+ os.write(fd, chunk)
+ finally:
+ locks.unlock(fd)
+ os.close(fd)
+ except OSError, e:
+ if e.errno == errno.EEXIST:
+ # Ooops, the file exists. We need a new file name.
+ name = self.get_available_name(name)
+ full_path = self.path(name)
+ else:
+ raise
+ else:
+ # OK, the file save worked. Break out of the loop.
+ break
+
+ if settings.FILE_UPLOAD_PERMISSIONS is not None:
+ os.chmod(full_path, settings.FILE_UPLOAD_PERMISSIONS)
+
+ return name
+
+ def delete(self, name):
+ name = self.path(name)
+ # If the file exists, delete it from the filesystem.
+ if os.path.exists(name):
+ os.remove(name)
+
+ def exists(self, name):
+ return os.path.exists(self.path(name))
+
+ def listdir(self, path):
+ path = self.path(path)
+ directories, files = [], []
+ for entry in os.listdir(path):
+ if os.path.isdir(os.path.join(path, entry)):
+ directories.append(entry)
+ else:
+ files.append(entry)
+ return directories, files
+
+ def path(self, name):
+ try:
+ path = safe_join(self.location, name)
+ except ValueError:
+ raise SuspiciousOperation("Attempted access to '%s' denied." % name)
+ return os.path.normpath(path)
+
+ def size(self, name):
+ return os.path.getsize(self.path(name))
+
+ def url(self, name):
+ if self.base_url is None:
+ raise ValueError("This file is not accessible via a URL.")
+ return urlparse.urljoin(self.base_url, name).replace('\\', '/')
+
+def get_storage_class(import_path):
+ try:
+ dot = import_path.rindex('.')
+ except ValueError:
+ raise ImproperlyConfigured("%s isn't a storage module." % import_path)
+ module, classname = import_path[:dot], import_path[dot+1:]
+ try:
+ mod = __import__(module, {}, {}, [''])
+ except ImportError, e:
+ raise ImproperlyConfigured('Error importing storage module %s: "%s"' % (module, e))
+ try:
+ return getattr(mod, classname)
+ except AttributeError:
+ raise ImproperlyConfigured('Storage module "%s" does not define a "%s" class.' % (module, classname))
+
+DefaultStorage = get_storage_class(settings.DEFAULT_FILE_STORAGE)
+default_storage = DefaultStorage()