Source code for pytomo.dns.e164

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"""DNS E.164 helpers

@var public_enum_domain: The DNS public ENUM domain, e164.arpa.
@type public_enum_domain: dns_name.Name object
"""

from __future__ import absolute_import

from . import exception as dns_exception
from . import name as dns_name
from . import resolver as dns_resolver

public_enum_domain = dns_name.from_text('e164.arpa.')

[docs]def from_e164(text, origin=public_enum_domain): """Convert an E.164 number in textual form into a Name object whose value is the ENUM domain name for that number. @param text: an E.164 number in textual form. @type text: str @param origin: The domain in which the number should be constructed. The default is e164.arpa. @type: dns_name.Name object or None @rtype: dns_name.Name object """ parts = [d for d in text if d.isdigit()] parts.reverse() return dns_name.from_text('.'.join(parts), origin=origin)
[docs]def to_e164(name, origin=public_enum_domain, want_plus_prefix=True): """Convert an ENUM domain name into an E.164 number. @param name: the ENUM domain name. @type name: dns_name.Name object. @param origin: A domain containing the ENUM domain name. The name is relativized to this domain before being converted to text. @type: dns_name.Name object or None @param want_plus_prefix: if True, add a '+' to the beginning of the returned number. @rtype: str """ if not origin is None: name = name.relativize(origin) dlabels = [d for d in name.labels if (d.isdigit() and len(d) == 1)] if len(dlabels) != len(name.labels): raise dns_exception.SyntaxError('non-digit labels in ENUM domain name') dlabels.reverse() text = ''.join(dlabels) if want_plus_prefix: text = '+' + text return text
[docs]def query(number, domains, resolver=None): """Look for NAPTR RRs for the specified number in the specified domains. e.g. lookup('16505551212', ['e164.dnspython.org.', 'e164.arpa.']) """ if resolver is None: resolver = dns_resolver.get_default_resolver() for domain in domains: if isinstance(domain, (str, unicode)): domain = dns_name.from_text(domain) qname = from_e164(number, domain) try: return resolver.query(qname, 'NAPTR') except dns_resolver.NXDOMAIN: pass raise dns_resolver.NXDOMAIN