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import sys
import re
import dns
import bitcoin
import dnssec
from util import StoreDict, print_error
from i18n import _
class Contacts(StoreDict):
def __init__(self, config):
StoreDict.__init__(self, config, 'contacts')
def resolve(self, k):
if bitcoin.is_address(k):
return {
'address': k,
'type': 'address'
}
if k in self.keys():
_type, addr = self[k]
if _type == 'address':
return {
'address': addr,
'type': 'contact'
}
out = self.resolve_openalias(k)
if out:
address, name, validated = out
return {
'address': address,
'name': name,
'type': 'openalias',
'validated': validated
}
raise Exception("Invalid Bitcoin address or alias", k)
def resolve_openalias(self, url):
# support email-style addresses, per the OA standard
url = url.replace('@', '.')
records, validated = dnssec.query(url, dns.rdatatype.TXT)
prefix = 'btc'
for record in records:
string = record.strings[0]
if string.startswith('oa1:' + prefix):
address = self.find_regex(string, r'recipient_address=([A-Za-z0-9]+)')
name = self.find_regex(string, r'recipient_name=([^;]+)')
if not name:
name = address
if not address:
continue
return address, name, validated
def find_regex(self, haystack, needle):
regex = re.compile(needle)
try:
return regex.search(haystack).groups()[0]
except AttributeError:
return None