Update @ssl_required decorator to play nice with other decorators

The decorator now retains all attributes of the original view and adds a
new 'view.ssl_required = True' attribute.

pgweb/util/decorators.py

@@ -1,9 +1,12 @@
 import datetime
+from functools import wraps
 
 def ssl_required(fn):
 	def _require_ssl(request, *_args, **_kwargs):
 		return fn(request, *_args, **_kwargs)
-	return _require_ssl
+	_require_ssl.ssl_required = True
+	# wraps retains original function attributes such as __name__, csrf_exempt, etc
+	return wraps(_require_ssl)(fn)
 
 def nocache(fn):
 	def _nocache(request, *_args, **_kwargs):

pgweb/util/middleware.py

@@ -30,7 +30,7 @@ class PgMiddleware(object):
 				return HttpResponseRedirect(request.build_absolute_uri().replace('http://','https://',1))
 			return None
 
-		if view_func.__name__ == '_require_ssl':
+		if getattr(view_func, 'ssl_required', False):
 			# This view requires SSL, so check if we have it
 			if not request.is_secure():
 				# May need to deal with ports specified here?