#
#	Split User-Name in NAI format (RFC 4282) into components
#
#  This policy writes the Username and Domain portions of the
#  NAI into the Stripped-User-Name and Stripped-User-Domain
#  attributes.
#
#  The regular expression to do this is not strictly compliant
#  with the standard, but it is not possible to write a
#  compliant regexp without perl style regular expressions (or
#  at least not a legible one).
#
nai_regexp = "^([^@]*)(@([-[:alnum:]]+\\.[-[:alnum:].]+))?$"

split_username_nai {
	if(User-Name =~ /${policy.nai_regexp}/){
		update request {
			Stripped-User-Name := "%{1}"
			Stripped-User-Domain = "%{3}"
		}

		# If any of the expansions result in a null
		# string, the update section may return
		# something other than updated...
		updated
	}
	else {
		noop
	}
}

#
#  If called in post-proxy we modify the proxy-reply message
#
split_username_nai.post-proxy {
	if(proxy-reply:User-Name =~ /${policy.nai_regexp}/){
		update proxy-reply {
			Stripped-User-Name := "%{1}"
			Stripped-User-Domain = "%{3}"
		}
		updated
	}
	else {
		noop
	}
}

#
#  Normalize the MAC Addresses in the Calling/Called-Station-Id
#
mac-addr-regexp = ([0-9a-f]{2})[^0-9a-f]?([0-9a-f]{2})[^0-9a-f]?([0-9a-f]{2})[^0-9a-f]?([0-9a-f]{2})[^0-9a-f]?([0-9a-f]{2})[^0-9a-f]?([0-9a-f]{2})

#
#  Add "rewrite_called_station_id" in the "authorize" and
#  "preacct" sections.
#
rewrite_called_station_id {
	if(Called-Station-Id =~ /^${policy.mac-addr-regexp}(:(.+))?$/i) {
		update request {
			Called-Station-Id := "%{tolower:%{1}-%{2}-%{3}-%{4}-%{5}-%{6}}"
		}

		# SSID component?
		if ("%{8}") {
			update request {
				Called-Station-SSID := "%{8}"
			}
		}
		updated
	}
	else {
		noop
	}
}

#
#  Add "rewrite_calling_station_id" in the "authorize" and
#  "preacct" sections.
#
rewrite_calling_station_id {
	if(Calling-Station-Id =~ /^${policy.mac-addr-regexp}$/i) {
		update request {
			Calling-Station-Id := "%{tolower:%{1}-%{2}-%{3}-%{4}-%{5}-%{6}}"
		}
		updated
	}
	else {
		noop
	}
}