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import sys
from django.conf import settings as django_settings
from django.http import Http404, HttpResponseRedirect
def require_path_active_request_processor(page, request):
"""
Checks whether any ancestors are actually inaccessible (ie. not
inactive or expired) and raise a 404 if so.
"""
if not page.are_ancestors_active():
raise Http404()
def redirect_request_processor(page, request):
"""
Returns a ``HttpResponseRedirect`` instance if the current page says
a redirect should happen.
"""
target = page.get_redirect_to_target(request)
if target:
if request._feincms_extra_context.get('extra_path', '/') == '/':
return HttpResponseRedirect(target)
raise Http404()
def frontendediting_request_processor(page, request):
"""
Sets the frontend editing state in the session depending on the
``frontend_editing`` GET parameter and the user's permissions.
"""
if not 'frontend_editing' in request.GET:
return
if request.user.has_module_perms('page'):
try:
enable_fe = int(request.GET['frontend_editing']) > 0
except ValueError:
enable_fe = False
response = HttpResponseRedirect(request.path)
response.set_cookie('frontend_editing', enable_fe)
# Redirect to cleanup URLs
return response
def etag_request_processor(page, request):
"""
Short-circuits the request-response cycle if the ETag matches.
"""
# XXX is this a performance concern? Does it create a new class
# every time the processor is called or is this optimized to a static
# class??
class DummyResponse(dict):
"""
This is a dummy class with enough behaviour of HttpResponse so we
can use the condition decorator without too much pain.
"""
def has_header(page, what):
return False
def dummy_response_handler(*args, **kwargs):
return DummyResponse()
def etagger(request, page, *args, **kwargs):
etag = page.etag(request)
return etag
def lastmodifier(request, page, *args, **kwargs):
lm = page.last_modified()
return lm
# Unavailable in Django 1.0 -- the current implementation of ETag support
# requires Django 1.1 unfortunately.
from django.views.decorators.http import condition
# Now wrap the condition decorator around our dummy handler:
# the net effect is that we will be getting a DummyResponse from
# the handler if processing is to continue and a non-DummyResponse
# (should be a "304 not modified") if the etag matches.
rsp = condition(etag_func=etagger, last_modified_func=lastmodifier)(dummy_response_handler)(request, page)
# If dummy then don't do anything, if a real response, return and
# thus shortcut the request processing.
if not isinstance(rsp, DummyResponse):
return rsp
def etag_response_processor(page, request, response):
"""
Response processor to set an etag header on outgoing responses.
The Page.etag() method must return something valid as etag content
whenever you want an etag header generated.
"""
etag = page.etag(request)
if etag is not None:
response['ETag'] = '"' + etag + '"'
def debug_sql_queries_response_processor(verbose=False, file=sys.stderr):
"""
Attaches a handler which prints the query count (and optionally all individual queries
which have been executed) on the console. Does nothing if ``DEBUG = False``.
Example::
from feincms.module.page import models, processors
models.Page.register_response_procesors(
processors.debug_sql_queries_response_processor(verbose=True),
)
"""
if not django_settings.DEBUG:
return lambda page, request, response: None
def processor(page, request, response):
from django.db import connection
print_sql = lambda x: x
try:
import sqlparse
print_sql = lambda x: sqlparse.format(x, reindent=True, keyword_case='upper')
except:
pass
if verbose:
print >> file, "--------------------------------------------------------------"
time = 0.0
i = 0
for q in connection.queries:
i += 1
if verbose:
print >> file, "%d : [%s]\n%s\n" % ( i, q['time'], print_sql(q['sql']))
time += float(q['time'])
print >> file, "--------------------------------------------------------------"
print >> file, "Total: %d queries, %.3f ms" % (i, time)
print >> file, "--------------------------------------------------------------"
return processor
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