def process_response(self, request, response):
response['Date'] = http_date()
if not response.has_header('Content-Length'):
response['Content-Length'] = str(len(response.content))
if response.has_header('ETag'):
if_none_match = request.META.get('HTTP_IF_NONE_MATCH')
if if_none_match == response['ETag']:
# Setting the status is enough here. The response handling path
# automatically removes content for this status code (in
# http.conditional_content_removal()).
response.status_code = 304
if response.has_header('Last-Modified'):
if_modified_since = request.META.get('HTTP_IF_MODIFIED_SINCE')
if if_modified_since is not None:
if_modified_since = parse_http_date_safe(if_modified_since)
if if_modified_since is not None:
last_modified = parse_http_date_safe(response['Last-Modified'])
if last_modified is not None and last_modified <= if_modified_since:
# Setting the status code is enough here (same reasons as
# above).
response.status_code = 304
return response
def serve(request, path, document_root=None, show_indexes=False):
"""
Serve static files below a given point in the directory structure.
To use, put a URL pattern such as::
(r'^(?P<path>.*)$', 'djangocg.views.static.serve', {'document_root' : '/path/to/my/files/'})
in your URLconf. You must provide the ``document_root`` param. You may
also set ``show_indexes`` to ``True`` if you'd like to serve a basic index
of the directory. This index view will use the template hardcoded below,
but if you'd like to override it, you can create a template called
``static/directory_index.html``.
"""
path = posixpath.normpath(unquote(path))
path = path.lstrip('/')
newpath = ''
for part in path.split('/'):
if not part:
# Strip empty path components.
continue
drive, part = os.path.splitdrive(part)
head, part = os.path.split(part)
if part in (os.curdir, os.pardir):
# Strip '.' and '..' in path.
continue
newpath = os.path.join(newpath, part).replace('\\', '/')
if newpath and path != newpath:
return HttpResponseRedirect(newpath)
fullpath = os.path.join(document_root, newpath)
if os.path.isdir(fullpath):
if show_indexes:
return directory_index(newpath, fullpath)
raise Http404(_("Directory indexes are not allowed here."))
if not os.path.exists(fullpath):
raise Http404(_('"%(path)s" does not exist') % {'path': fullpath})
# Respect the If-Modified-Since header.
statobj = os.stat(fullpath)
mimetype, encoding = mimetypes.guess_type(fullpath)
mimetype = mimetype or 'application/octet-stream'
if not was_modified_since(request.META.get('HTTP_IF_MODIFIED_SINCE'),
statobj.st_mtime, statobj.st_size):
return HttpResponseNotModified()
with open(fullpath, 'rb') as f:
response = HttpResponse(f.read(), content_type=mimetype)
response["Last-Modified"] = http_date(statobj.st_mtime)
if stat.S_ISREG(statobj.st_mode):
response["Content-Length"] = statobj.st_size
if encoding:
response["Content-Encoding"] = encoding
return response
def patch_response_headers(response, cache_timeout=None):
"""
Adds some useful headers to the given HttpResponse object:
ETag, Last-Modified, Expires and Cache-Control
Each header is only added if it isn't already set.
cache_timeout is in seconds. The CACHE_MIDDLEWARE_SECONDS setting is used
by default.
"""
if cache_timeout is None:
cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
if cache_timeout < 0:
cache_timeout = 0 # Can't have max-age negative
if settings.USE_ETAGS and not response.has_header('ETag'):
if hasattr(response, 'render') and callable(response.render):
response.add_post_render_callback(_set_response_etag)
else:
response = _set_response_etag(response)
if not response.has_header('Last-Modified'):
response['Last-Modified'] = http_date()
if not response.has_header('Expires'):
response['Expires'] = http_date(time.time() + cache_timeout)
patch_cache_control(response, max_age=cache_timeout)
def inner(request, *args, **kwargs):
# Get HTTP request headers
if_modified_since = request.META.get("HTTP_IF_MODIFIED_SINCE")
if if_modified_since:
if_modified_since = parse_http_date_safe(if_modified_since)
if_none_match = request.META.get("HTTP_IF_NONE_MATCH")
if_match = request.META.get("HTTP_IF_MATCH")
if if_none_match or if_match:
# There can be more than one ETag in the request, so we
# consider the list of values.
try:
etags = parse_etags(if_none_match or if_match)
except ValueError:
# In case of invalid etag ignore all ETag headers.
# Apparently Opera sends invalidly quoted headers at times
# (we should be returning a 400 response, but that's a
# little extreme) -- this is Django bug #10681.
if_none_match = None
if_match = None
# Compute values (if any) for the requested resource.
if etag_func:
res_etag = etag_func(request, *args, **kwargs)
else:
res_etag = None
if last_modified_func:
dt = last_modified_func(request, *args, **kwargs)
if dt:
res_last_modified = timegm(dt.utctimetuple())
else:
res_last_modified = None
else:
res_last_modified = None
response = None
if not ((if_match and (if_modified_since or if_none_match)) or
(if_match and if_none_match)):
# We only get here if no undefined combinations of headers are
# specified.
if ((if_none_match and (res_etag in etags or
"*" in etags and res_etag)) and
(not if_modified_since or
(res_last_modified and if_modified_since and
res_last_modified <= if_modified_since))):
if request.method in ("GET", "HEAD"):
response = HttpResponseNotModified()
else:
logger.warning('Precondition Failed: %s', request.path,
extra={
'status_code': 412,
'request': request
}
)
response = HttpResponse(status=412)
elif if_match and ((not res_etag and "*" in etags) or
(res_etag and res_etag not in etags)):
logger.warning('Precondition Failed: %s', request.path,
extra={
'status_code': 412,
'request': request
}
)
response = HttpResponse(status=412)
elif (not if_none_match and request.method == "GET" and
res_last_modified and if_modified_since and
res_last_modified <= if_modified_since):
response = HttpResponseNotModified()
if response is None:
response = func(request, *args, **kwargs)
# Set relevant headers on the response if they don't already exist.
if res_last_modified and not response.has_header('Last-Modified'):
response['Last-Modified'] = http_date(res_last_modified)
if res_etag and not response.has_header('ETag'):
response['ETag'] = quote_etag(res_etag)
return response
def test_http_date(self):
t = 1167616461.0
self.assertEqual(http_date(t), 'Mon, 01 Jan 2007 01:54:21 GMT')
