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"""
Debug Toolbar middleware
"""
import re
from django.conf import settings
from django.utils.encoding import smart_str
from django.conf.urls.defaults import include, patterns
import debug_toolbar.urls
from debug_toolbar.toolbar.loader import DebugToolbar
_HTML_TYPES = ('text/html', 'application/xhtml+xml')
_END_HEAD_RE = re.compile(r'</head>', re.IGNORECASE)
_END_BODY_RE = re.compile(r'<body([^<]*)>', re.IGNORECASE)
class DebugToolbarMiddleware(object):
"""
Middleware to set up Debug Toolbar on incoming request and render toolbar
on outgoing response.
"""
def __init__(self):
self.debug_toolbar = None
def show_toolbar(self, request):
if not settings.DEBUG:
return False
if request.is_ajax():
return False
if not request.META.get('REMOTE_ADDR') in settings.INTERNAL_IPS:
return False
return True
def process_request(self, request):
if self.show_toolbar(request):
self.debug_toolbar = DebugToolbar(request)
self.debug_toolbar.load_panels()
# Monkeypatch in the URLpatterns for the debug toolbar. The last item
# in the URLpatterns needs to be ```('', include(ROOT_URLCONF))``` so
# that the existing URLs load *after* the ones we patch in. However,
# this is difficult to get right: a previous middleware might have
# changed request.urlconf, so we need to pick that up instead.
original_urlconf = getattr(request, 'urlconf', settings.ROOT_URLCONF)
debug_toolbar.urls.urlpatterns += patterns('',
('', include(original_urlconf)),
)
request.urlconf = 'debug_toolbar.urls'
return None
def process_response(self, request, response):
if response.status_code != 200:
return response
if self.show_toolbar(request):
if response['Content-Type'].split(';')[0] in _HTML_TYPES:
# Saving this here in case we ever need to inject into <head>
#response.content = _END_HEAD_RE.sub(smart_str(self.debug_toolbar.render_styles() + "%s" % match.group()), response.content)
response.content = _END_BODY_RE.sub(smart_str('<body\\1>' + self.debug_toolbar.render_toolbar()), response.content)
return response
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