Django middleware to validate every HTML response with html5lib.
Usage
- Save to middleware.py
- Add 'middleware.ProfileMiddleware' to MIDDLEWARE_CLASSES
Listing
from html5lib.html5parser import HTMLParser
from html5lib import treebuilders
from django.http import HttpResponse
class ValidateMiddleware(object):
def process_request(self, request):
pass
def process_response(self, request, response):
if response.content and 'html' in response['Content-Type'] \
and 'disable-validation' not in request.GET:
# validate
treebuilder = treebuilders.getTreeBuilder("simpleTree")
parser = HTMLParser(tree=treebuilder, strict=True)
try:
parser.parse(response.content)
except Exception:
pass
if parser.errors:
# format output
out = []
lines = response.content.splitlines()
for (row, col), e, d in parser.errors:
out.append('%s, %s' % (e, d))
for x in range(max(0, row - 3), min(len(lines), row + 1)):
out.append(lines[x])
out.append(' ' * col + '^')
out = '\n'.join(out)
return HttpResponse(out, mimetype='text/plain')
return response
def process_view(self, request, callback, callback_args, callback_kwargs):
return callback(request, *callback_args, **callback_kwargs)
