268 lines
9.1 KiB
Python
268 lines
9.1 KiB
Python
from collections import OrderedDict
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import os
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from django.conf import settings
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from django.core.exceptions import ImproperlyConfigured
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from django.core.files.storage import default_storage, Storage, FileSystemStorage
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from django.utils.functional import empty, memoize, LazyObject
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from django.utils.module_loading import import_by_path
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from django.utils._os import safe_join
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from django.utils import six
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from django.contrib.staticfiles import utils
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from django.contrib.staticfiles.storage import AppStaticStorage
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_finders = OrderedDict()
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class BaseFinder(object):
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"""
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A base file finder to be used for custom staticfiles finder classes.
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"""
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def find(self, path, all=False):
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"""
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Given a relative file path this ought to find an
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absolute file path.
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If the ``all`` parameter is ``False`` (default) only
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the first found file path will be returned; if set
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to ``True`` a list of all found files paths is returned.
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"""
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raise NotImplementedError('subclasses of BaseFinder must provide a find() method')
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def list(self, ignore_patterns):
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"""
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Given an optional list of paths to ignore, this should return
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a two item iterable consisting of the relative path and storage
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instance.
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"""
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raise NotImplementedError('subclasses of BaseFinder must provide a list() method')
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class FileSystemFinder(BaseFinder):
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"""
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A static files finder that uses the ``STATICFILES_DIRS`` setting
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to locate files.
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"""
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def __init__(self, apps=None, *args, **kwargs):
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# List of locations with static files
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self.locations = []
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# Maps dir paths to an appropriate storage instance
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self.storages = OrderedDict()
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if not isinstance(settings.STATICFILES_DIRS, (list, tuple)):
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raise ImproperlyConfigured(
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"Your STATICFILES_DIRS setting is not a tuple or list; "
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"perhaps you forgot a trailing comma?")
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for root in settings.STATICFILES_DIRS:
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if isinstance(root, (list, tuple)):
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prefix, root = root
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else:
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prefix = ''
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if os.path.abspath(settings.STATIC_ROOT) == os.path.abspath(root):
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raise ImproperlyConfigured(
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"The STATICFILES_DIRS setting should "
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"not contain the STATIC_ROOT setting")
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if (prefix, root) not in self.locations:
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self.locations.append((prefix, root))
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for prefix, root in self.locations:
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filesystem_storage = FileSystemStorage(location=root)
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filesystem_storage.prefix = prefix
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self.storages[root] = filesystem_storage
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super(FileSystemFinder, self).__init__(*args, **kwargs)
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def find(self, path, all=False):
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"""
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Looks for files in the extra locations
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as defined in ``STATICFILES_DIRS``.
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"""
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matches = []
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for prefix, root in self.locations:
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matched_path = self.find_location(root, path, prefix)
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if matched_path:
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if not all:
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return matched_path
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matches.append(matched_path)
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return matches
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def find_location(self, root, path, prefix=None):
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"""
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Finds a requested static file in a location, returning the found
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absolute path (or ``None`` if no match).
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"""
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if prefix:
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prefix = '%s%s' % (prefix, os.sep)
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if not path.startswith(prefix):
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return None
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path = path[len(prefix):]
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path = safe_join(root, path)
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if os.path.exists(path):
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return path
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def list(self, ignore_patterns):
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"""
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List all files in all locations.
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"""
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for prefix, root in self.locations:
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storage = self.storages[root]
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for path in utils.get_files(storage, ignore_patterns):
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yield path, storage
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class AppDirectoriesFinder(BaseFinder):
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"""
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A static files finder that looks in the directory of each app as
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specified in the source_dir attribute of the given storage class.
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"""
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storage_class = AppStaticStorage
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def __init__(self, apps=None, *args, **kwargs):
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# The list of apps that are handled
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self.apps = []
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# Mapping of app module paths to storage instances
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self.storages = OrderedDict()
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if apps is None:
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apps = settings.INSTALLED_APPS
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for app in apps:
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app_storage = self.storage_class(app)
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if os.path.isdir(app_storage.location):
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self.storages[app] = app_storage
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if app not in self.apps:
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self.apps.append(app)
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super(AppDirectoriesFinder, self).__init__(*args, **kwargs)
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def list(self, ignore_patterns):
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"""
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List all files in all app storages.
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"""
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for storage in six.itervalues(self.storages):
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if storage.exists(''): # check if storage location exists
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for path in utils.get_files(storage, ignore_patterns):
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yield path, storage
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def find(self, path, all=False):
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"""
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Looks for files in the app directories.
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"""
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matches = []
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for app in self.apps:
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match = self.find_in_app(app, path)
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if match:
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if not all:
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return match
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matches.append(match)
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return matches
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def find_in_app(self, app, path):
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"""
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Find a requested static file in an app's static locations.
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"""
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storage = self.storages.get(app, None)
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if storage:
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if storage.prefix:
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prefix = '%s%s' % (storage.prefix, os.sep)
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if not path.startswith(prefix):
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return None
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path = path[len(prefix):]
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# only try to find a file if the source dir actually exists
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if storage.exists(path):
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matched_path = storage.path(path)
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if matched_path:
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return matched_path
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class BaseStorageFinder(BaseFinder):
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"""
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A base static files finder to be used to extended
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with an own storage class.
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"""
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storage = None
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def __init__(self, storage=None, *args, **kwargs):
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if storage is not None:
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self.storage = storage
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if self.storage is None:
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raise ImproperlyConfigured("The staticfiles storage finder %r "
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"doesn't have a storage class "
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"assigned." % self.__class__)
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# Make sure we have an storage instance here.
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if not isinstance(self.storage, (Storage, LazyObject)):
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self.storage = self.storage()
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super(BaseStorageFinder, self).__init__(*args, **kwargs)
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def find(self, path, all=False):
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"""
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Looks for files in the default file storage, if it's local.
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"""
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try:
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self.storage.path('')
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except NotImplementedError:
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pass
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else:
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if self.storage.exists(path):
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match = self.storage.path(path)
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if all:
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match = [match]
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return match
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return []
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def list(self, ignore_patterns):
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"""
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List all files of the storage.
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"""
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for path in utils.get_files(self.storage, ignore_patterns):
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yield path, self.storage
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class DefaultStorageFinder(BaseStorageFinder):
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"""
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A static files finder that uses the default storage backend.
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"""
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storage = default_storage
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def __init__(self, *args, **kwargs):
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super(DefaultStorageFinder, self).__init__(*args, **kwargs)
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base_location = getattr(self.storage, 'base_location', empty)
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if not base_location:
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raise ImproperlyConfigured("The storage backend of the "
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"staticfiles finder %r doesn't have "
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"a valid location." % self.__class__)
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def find(path, all=False):
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"""
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Find a static file with the given path using all enabled finders.
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If ``all`` is ``False`` (default), return the first matching
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absolute path (or ``None`` if no match). Otherwise return a list.
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"""
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matches = []
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for finder in get_finders():
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result = finder.find(path, all=all)
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if not all and result:
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return result
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if not isinstance(result, (list, tuple)):
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result = [result]
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matches.extend(result)
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if matches:
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return matches
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# No match.
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return [] if all else None
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def get_finders():
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for finder_path in settings.STATICFILES_FINDERS:
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yield get_finder(finder_path)
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def _get_finder(import_path):
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"""
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Imports the staticfiles finder class described by import_path, where
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import_path is the full Python path to the class.
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"""
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Finder = import_by_path(import_path)
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if not issubclass(Finder, BaseFinder):
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raise ImproperlyConfigured('Finder "%s" is not a subclass of "%s"' %
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(Finder, BaseFinder))
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return Finder()
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get_finder = memoize(_get_finder, _finders, 1)
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