296 lines
10 KiB
Python
296 lines
10 KiB
Python
import functools
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import os
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from django.apps import apps
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from django.conf import settings
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from django.contrib.staticfiles import utils
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from django.core.checks import Error
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from django.core.exceptions import ImproperlyConfigured
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from django.core.files.storage import (
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FileSystemStorage, Storage, default_storage,
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)
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from django.utils._os import safe_join
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from django.utils.functional import LazyObject, empty
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from django.utils.module_loading import import_string
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# To keep track on which directories the finder has searched the static files.
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searched_locations = []
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class BaseFinder:
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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 check(self, **kwargs):
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raise NotImplementedError(
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'subclasses may provide a check() method to verify the finder is '
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'configured correctly.'
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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, find an absolute file path.
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If the ``all`` parameter is False (default) return only the first found
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file path; if True, return a list of all found files paths.
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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, return a two item iterable
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consisting of the relative path and storage 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, app_names=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 = {}
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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 (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().__init__(*args, **kwargs)
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def check(self, **kwargs):
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errors = []
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if not isinstance(settings.STATICFILES_DIRS, (list, tuple)):
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errors.append(Error(
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'The STATICFILES_DIRS setting is not a tuple or list.',
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hint='Perhaps you forgot a trailing comma?',
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id='staticfiles.E001',
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))
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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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if prefix.endswith('/'):
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errors.append(Error(
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'The prefix %r in the STATICFILES_DIRS setting must '
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'not end with a slash.' % prefix,
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id='staticfiles.E003',
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))
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if settings.STATIC_ROOT and os.path.abspath(settings.STATIC_ROOT) == os.path.abspath(root):
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errors.append(Error(
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'The STATICFILES_DIRS setting should not contain the '
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'STATIC_ROOT setting.',
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id='staticfiles.E002',
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))
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return errors
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def find(self, path, all=False):
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"""
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Look for files in the extra locations 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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if root not in searched_locations:
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searched_locations.append(root)
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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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Find a requested static file in a location and return 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.
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"""
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storage_class = FileSystemStorage
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source_dir = 'static'
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def __init__(self, app_names=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 names to storage instances
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self.storages = {}
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app_configs = apps.get_app_configs()
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if app_names:
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app_names = set(app_names)
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app_configs = [ac for ac in app_configs if ac.name in app_names]
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for app_config in app_configs:
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app_storage = self.storage_class(
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os.path.join(app_config.path, self.source_dir))
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if os.path.isdir(app_storage.location):
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self.storages[app_config.name] = app_storage
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if app_config.name not in self.apps:
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self.apps.append(app_config.name)
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super().__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 self.storages.values():
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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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Look 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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app_location = self.storages[app].location
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if app_location not in searched_locations:
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searched_locations.append(app_location)
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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)
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if storage:
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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 a 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().__init__(*args, **kwargs)
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def find(self, path, all=False):
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"""
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Look 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.location not in searched_locations:
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searched_locations.append(self.storage.location)
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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().__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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searched_locations[:] = []
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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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@functools.lru_cache(maxsize=None)
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def get_finder(import_path):
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"""
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Import 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_string(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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