498 lines
19 KiB
Python
498 lines
19 KiB
Python
import hashlib
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import json
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import os
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import posixpath
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import re
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from collections import OrderedDict
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from urllib.parse import unquote, urldefrag, urlsplit, urlunsplit
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from django.conf import settings
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from django.contrib.staticfiles.utils import check_settings, matches_patterns
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from django.core.cache import (
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InvalidCacheBackendError, cache as default_cache, caches,
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)
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from django.core.exceptions import ImproperlyConfigured
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from django.core.files.base import ContentFile
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from django.core.files.storage import FileSystemStorage, get_storage_class
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from django.utils.encoding import force_bytes
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from django.utils.functional import LazyObject
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class StaticFilesStorage(FileSystemStorage):
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"""
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Standard file system storage for static files.
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The defaults for ``location`` and ``base_url`` are
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``STATIC_ROOT`` and ``STATIC_URL``.
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"""
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def __init__(self, location=None, base_url=None, *args, **kwargs):
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if location is None:
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location = settings.STATIC_ROOT
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if base_url is None:
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base_url = settings.STATIC_URL
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check_settings(base_url)
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super().__init__(location, base_url, *args, **kwargs)
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# FileSystemStorage fallbacks to MEDIA_ROOT when location
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# is empty, so we restore the empty value.
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if not location:
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self.base_location = None
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self.location = None
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def path(self, name):
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if not self.location:
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raise ImproperlyConfigured("You're using the staticfiles app "
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"without having set the STATIC_ROOT "
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"setting to a filesystem path.")
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return super().path(name)
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class HashedFilesMixin:
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default_template = """url("%s")"""
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max_post_process_passes = 5
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patterns = (
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("*.css", (
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r"""(url\(['"]{0,1}\s*(.*?)["']{0,1}\))""",
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(r"""(@import\s*["']\s*(.*?)["'])""", """@import url("%s")"""),
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)),
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)
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self._patterns = OrderedDict()
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self.hashed_files = {}
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for extension, patterns in self.patterns:
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for pattern in patterns:
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if isinstance(pattern, (tuple, list)):
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pattern, template = pattern
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else:
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template = self.default_template
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compiled = re.compile(pattern, re.IGNORECASE)
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self._patterns.setdefault(extension, []).append((compiled, template))
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def file_hash(self, name, content=None):
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"""
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Return a hash of the file with the given name and optional content.
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"""
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if content is None:
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return None
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md5 = hashlib.md5()
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for chunk in content.chunks():
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md5.update(chunk)
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return md5.hexdigest()[:12]
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def hashed_name(self, name, content=None, filename=None):
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# `filename` is the name of file to hash if `content` isn't given.
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# `name` is the base name to construct the new hashed filename from.
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parsed_name = urlsplit(unquote(name))
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clean_name = parsed_name.path.strip()
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if filename:
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filename = urlsplit(unquote(filename)).path.strip()
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filename = filename or clean_name
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opened = False
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if content is None:
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if not self.exists(filename):
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raise ValueError("The file '%s' could not be found with %r." % (filename, self))
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try:
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content = self.open(filename)
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except IOError:
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# Handle directory paths and fragments
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return name
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opened = True
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try:
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file_hash = self.file_hash(clean_name, content)
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finally:
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if opened:
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content.close()
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path, filename = os.path.split(clean_name)
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root, ext = os.path.splitext(filename)
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if file_hash is not None:
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file_hash = ".%s" % file_hash
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hashed_name = os.path.join(path, "%s%s%s" %
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(root, file_hash, ext))
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unparsed_name = list(parsed_name)
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unparsed_name[2] = hashed_name
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# Special casing for a @font-face hack, like url(myfont.eot?#iefix")
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# http://www.fontspring.com/blog/the-new-bulletproof-font-face-syntax
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if '?#' in name and not unparsed_name[3]:
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unparsed_name[2] += '?'
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return urlunsplit(unparsed_name)
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def _url(self, hashed_name_func, name, force=False, hashed_files=None):
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"""
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Return the non-hashed URL in DEBUG mode.
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"""
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if settings.DEBUG and not force:
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hashed_name, fragment = name, ''
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else:
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clean_name, fragment = urldefrag(name)
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if urlsplit(clean_name).path.endswith('/'): # don't hash paths
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hashed_name = name
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else:
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args = (clean_name,)
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if hashed_files is not None:
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args += (hashed_files,)
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hashed_name = hashed_name_func(*args)
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final_url = super().url(hashed_name)
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# Special casing for a @font-face hack, like url(myfont.eot?#iefix")
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# http://www.fontspring.com/blog/the-new-bulletproof-font-face-syntax
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query_fragment = '?#' in name # [sic!]
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if fragment or query_fragment:
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urlparts = list(urlsplit(final_url))
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if fragment and not urlparts[4]:
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urlparts[4] = fragment
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if query_fragment and not urlparts[3]:
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urlparts[2] += '?'
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final_url = urlunsplit(urlparts)
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return unquote(final_url)
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def url(self, name, force=False):
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"""
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Return the non-hashed URL in DEBUG mode.
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"""
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return self._url(self.stored_name, name, force)
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def url_converter(self, name, hashed_files, template=None):
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"""
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Return the custom URL converter for the given file name.
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"""
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if template is None:
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template = self.default_template
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def converter(matchobj):
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"""
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Convert the matched URL to a normalized and hashed URL.
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This requires figuring out which files the matched URL resolves
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to and calling the url() method of the storage.
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"""
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matched, url = matchobj.groups()
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# Ignore absolute/protocol-relative and data-uri URLs.
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if re.match(r'^[a-z]+:', url):
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return matched
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# Ignore absolute URLs that don't point to a static file (dynamic
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# CSS / JS?). Note that STATIC_URL cannot be empty.
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if url.startswith('/') and not url.startswith(settings.STATIC_URL):
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return matched
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# Strip off the fragment so a path-like fragment won't interfere.
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url_path, fragment = urldefrag(url)
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if url_path.startswith('/'):
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# Otherwise the condition above would have returned prematurely.
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assert url_path.startswith(settings.STATIC_URL)
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target_name = url_path[len(settings.STATIC_URL):]
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else:
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# We're using the posixpath module to mix paths and URLs conveniently.
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source_name = name if os.sep == '/' else name.replace(os.sep, '/')
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target_name = posixpath.join(posixpath.dirname(source_name), url_path)
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# Determine the hashed name of the target file with the storage backend.
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hashed_url = self._url(
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self._stored_name, unquote(target_name),
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force=True, hashed_files=hashed_files,
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)
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transformed_url = '/'.join(url_path.split('/')[:-1] + hashed_url.split('/')[-1:])
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# Restore the fragment that was stripped off earlier.
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if fragment:
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transformed_url += ('?#' if '?#' in url else '#') + fragment
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# Return the hashed version to the file
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return template % unquote(transformed_url)
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return converter
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def post_process(self, paths, dry_run=False, **options):
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"""
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Post process the given OrderedDict of files (called from collectstatic).
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Processing is actually two separate operations:
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1. renaming files to include a hash of their content for cache-busting,
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and copying those files to the target storage.
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2. adjusting files which contain references to other files so they
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refer to the cache-busting filenames.
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If either of these are performed on a file, then that file is considered
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post-processed.
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"""
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# don't even dare to process the files if we're in dry run mode
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if dry_run:
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return
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# where to store the new paths
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hashed_files = OrderedDict()
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# build a list of adjustable files
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adjustable_paths = [
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path for path in paths
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if matches_patterns(path, self._patterns)
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]
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# Do a single pass first. Post-process all files once, then repeat for
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# adjustable files.
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for name, hashed_name, processed, _ in self._post_process(paths, adjustable_paths, hashed_files):
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yield name, hashed_name, processed
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paths = {path: paths[path] for path in adjustable_paths}
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for i in range(self.max_post_process_passes):
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substitutions = False
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for name, hashed_name, processed, subst in self._post_process(paths, adjustable_paths, hashed_files):
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yield name, hashed_name, processed
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substitutions = substitutions or subst
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if not substitutions:
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break
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if substitutions:
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yield 'All', None, RuntimeError('Max post-process passes exceeded.')
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# Store the processed paths
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self.hashed_files.update(hashed_files)
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def _post_process(self, paths, adjustable_paths, hashed_files):
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# Sort the files by directory level
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def path_level(name):
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return len(name.split(os.sep))
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for name in sorted(paths, key=path_level, reverse=True):
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substitutions = True
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# use the original, local file, not the copied-but-unprocessed
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# file, which might be somewhere far away, like S3
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storage, path = paths[name]
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with storage.open(path) as original_file:
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cleaned_name = self.clean_name(name)
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hash_key = self.hash_key(cleaned_name)
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# generate the hash with the original content, even for
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# adjustable files.
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if hash_key not in hashed_files:
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hashed_name = self.hashed_name(name, original_file)
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else:
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hashed_name = hashed_files[hash_key]
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# then get the original's file content..
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if hasattr(original_file, 'seek'):
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original_file.seek(0)
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hashed_file_exists = self.exists(hashed_name)
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processed = False
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# ..to apply each replacement pattern to the content
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if name in adjustable_paths:
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old_hashed_name = hashed_name
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content = original_file.read().decode(settings.FILE_CHARSET)
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for extension, patterns in self._patterns.items():
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if matches_patterns(path, (extension,)):
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for pattern, template in patterns:
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converter = self.url_converter(name, hashed_files, template)
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try:
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content = pattern.sub(converter, content)
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except ValueError as exc:
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yield name, None, exc, False
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if hashed_file_exists:
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self.delete(hashed_name)
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# then save the processed result
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content_file = ContentFile(force_bytes(content))
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# Save intermediate file for reference
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saved_name = self._save(hashed_name, content_file)
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hashed_name = self.hashed_name(name, content_file)
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if self.exists(hashed_name):
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self.delete(hashed_name)
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saved_name = self._save(hashed_name, content_file)
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hashed_name = self.clean_name(saved_name)
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# If the file hash stayed the same, this file didn't change
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if old_hashed_name == hashed_name:
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substitutions = False
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processed = True
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if not processed:
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# or handle the case in which neither processing nor
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# a change to the original file happened
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if not hashed_file_exists:
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processed = True
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saved_name = self._save(hashed_name, original_file)
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hashed_name = self.clean_name(saved_name)
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# and then set the cache accordingly
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hashed_files[hash_key] = hashed_name
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yield name, hashed_name, processed, substitutions
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def clean_name(self, name):
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return name.replace('\\', '/')
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def hash_key(self, name):
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return name
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def _stored_name(self, name, hashed_files):
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# Normalize the path to avoid multiple names for the same file like
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# ../foo/bar.css and ../foo/../foo/bar.css which normalize to the same
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# path.
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name = posixpath.normpath(name)
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cleaned_name = self.clean_name(name)
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hash_key = self.hash_key(cleaned_name)
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cache_name = hashed_files.get(hash_key)
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if cache_name is None:
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cache_name = self.clean_name(self.hashed_name(name))
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return cache_name
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def stored_name(self, name):
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cleaned_name = self.clean_name(name)
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hash_key = self.hash_key(cleaned_name)
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cache_name = self.hashed_files.get(hash_key)
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if cache_name:
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return cache_name
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# No cached name found, recalculate it from the files.
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intermediate_name = name
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for i in range(self.max_post_process_passes + 1):
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cache_name = self.clean_name(
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self.hashed_name(name, content=None, filename=intermediate_name)
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)
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if intermediate_name == cache_name:
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# Store the hashed name if there was a miss.
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self.hashed_files[hash_key] = cache_name
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return cache_name
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else:
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# Move on to the next intermediate file.
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intermediate_name = cache_name
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# If the cache name can't be determined after the max number of passes,
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# the intermediate files on disk may be corrupt; avoid an infinite loop.
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raise ValueError("The name '%s' could not be hashed with %r." % (name, self))
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class ManifestFilesMixin(HashedFilesMixin):
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manifest_version = '1.0' # the manifest format standard
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manifest_name = 'staticfiles.json'
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manifest_strict = True
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.hashed_files = self.load_manifest()
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def read_manifest(self):
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try:
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with self.open(self.manifest_name) as manifest:
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return manifest.read().decode()
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except IOError:
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return None
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def load_manifest(self):
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content = self.read_manifest()
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if content is None:
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return OrderedDict()
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try:
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stored = json.loads(content, object_pairs_hook=OrderedDict)
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except json.JSONDecodeError:
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pass
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else:
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version = stored.get('version')
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if version == '1.0':
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return stored.get('paths', OrderedDict())
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raise ValueError("Couldn't load manifest '%s' (version %s)" %
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(self.manifest_name, self.manifest_version))
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def post_process(self, *args, **kwargs):
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self.hashed_files = OrderedDict()
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yield from super().post_process(*args, **kwargs)
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self.save_manifest()
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def save_manifest(self):
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payload = {'paths': self.hashed_files, 'version': self.manifest_version}
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if self.exists(self.manifest_name):
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self.delete(self.manifest_name)
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contents = json.dumps(payload).encode()
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self._save(self.manifest_name, ContentFile(contents))
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def stored_name(self, name):
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parsed_name = urlsplit(unquote(name))
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clean_name = parsed_name.path.strip()
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hash_key = self.hash_key(clean_name)
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cache_name = self.hashed_files.get(hash_key)
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if cache_name is None:
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if self.manifest_strict:
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raise ValueError("Missing staticfiles manifest entry for '%s'" % clean_name)
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cache_name = self.clean_name(self.hashed_name(name))
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unparsed_name = list(parsed_name)
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unparsed_name[2] = cache_name
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# Special casing for a @font-face hack, like url(myfont.eot?#iefix")
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# http://www.fontspring.com/blog/the-new-bulletproof-font-face-syntax
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if '?#' in name and not unparsed_name[3]:
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unparsed_name[2] += '?'
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return urlunsplit(unparsed_name)
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class _MappingCache:
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"""
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A small dict-like wrapper for a given cache backend instance.
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"""
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def __init__(self, cache):
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self.cache = cache
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def __setitem__(self, key, value):
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self.cache.set(key, value)
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def __getitem__(self, key):
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value = self.cache.get(key)
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if value is None:
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raise KeyError("Couldn't find a file name '%s'" % key)
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return value
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def clear(self):
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self.cache.clear()
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def update(self, data):
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self.cache.set_many(data)
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def get(self, key, default=None):
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try:
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return self[key]
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except KeyError:
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return default
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class CachedFilesMixin(HashedFilesMixin):
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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try:
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self.hashed_files = _MappingCache(caches['staticfiles'])
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except InvalidCacheBackendError:
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# Use the default backend
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self.hashed_files = _MappingCache(default_cache)
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def hash_key(self, name):
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key = hashlib.md5(force_bytes(self.clean_name(name))).hexdigest()
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return 'staticfiles:%s' % key
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class CachedStaticFilesStorage(CachedFilesMixin, StaticFilesStorage):
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"""
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A static file system storage backend which also saves
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hashed copies of the files it saves.
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"""
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pass
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class ManifestStaticFilesStorage(ManifestFilesMixin, StaticFilesStorage):
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"""
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A static file system storage backend which also saves
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hashed copies of the files it saves.
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"""
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pass
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class ConfiguredStorage(LazyObject):
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def _setup(self):
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self._wrapped = get_storage_class(settings.STATICFILES_STORAGE)()
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staticfiles_storage = ConfiguredStorage()
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