hostnames registration application for I2P
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#!/usr/bin/env python2.6
import re
from django import forms
from web.postkey.models import i2phost
def validate_hostname(data):
"""
Here we do additional hostname validation as described in
http://www.i2p2.i2p/naming.html
"""
# convert hostname to lowercase
data = data.lower()
# Must end with '.i2p'.
if re.match(r'.*\.i2p$', data) == None:
raise forms.ValidationError('Hostname doesn\'t ends with .i2p')
# Base 32 hostnames (*.b32.i2p) are not allowed
if re.match(r'.*\.b32\.i2p$', data):
raise forms.ValidationError('Base 32 hostnames are not allowed')
# Must contain only [a-z] [0-9] '.' and '-'
h = re.match(r'([a-z0-9.-]+)\.i2p$', data)
if h == None:
raise forms.ValidationError('Illegal characters in hostname')
else:
namepart = h.groups()[0]
# Must not contain '..'
if re.search(r'\.\.', namepart):
raise forms.ValidationError('".." in hostname')
# Must not contain '.-' or '-.' (as of 0.6.1.33)
if re.search(r'(\.-)|(-\.)', namepart):
raise forms.ValidationError('Hostname contain ".-" or "-."')
# Must not contain '--' except in 'xn--' for IDN
if re.search(r'(?<!^xn)--', namepart):
raise forms.ValidationError('Hostname contain "--" and it\'s not an IDN')
# Certain hostnames reserved for project use are not allowed
if re.search(r'(^|\.)(proxy|router|console)$', namepart):
raise forms.ValidationError('Trying to use reserved hostname')
return data
def validate_b64hash(data, check_uniq=True):
"""
Base64 hash validation
"""
length = len(data)
# Minimum key length 516 bytes
if length < 516:
raise forms.ValidationError('Specified base64 hash are less than 516 bytes')
# keys with cert may ends with anything, so check is relaxed
if length > 516 and re.match(r'[a-zA-Z0-9\-~]+$', data) == None:
raise forms.ValidationError('Invalid characters in base64 hash')
# base64-i2p
if length == 516 and re.match(r'[a-zA-Z0-9\-~]+AA$', data) == None:
raise forms.ValidationError('Invalid base64 hash')
if check_uniq == True:
# Avoid adding non-unique hashes
qs = i2phost.objects.filter(b64hash=data)
if qs.exists():
raise forms.ValidationError('Base64 hash must be unique')
return data