# Path: oppy/cell/exceptions.py
# class BadLinkSpecifier(Exception):
#     pass
# 
# class BadPayloadData(Exception):
#     pass
# 
# Path: oppy/util/tools.py
# def decodeMicrodescriptorIdentifier(microdescriptor):
#     ident = microdescriptor.identifier
#     short = 4-len(ident)%4
#     if short:
#         ident += '='*short
#     return base64.b64decode(ident).rstrip('=')


import ipaddress
import struct
import oppy.cell.definitions as DEF
from oppy.cell.exceptions import BadLinkSpecifier, BadPayloadData
from oppy.util.tools import decodeMicrodescriptorIdentifier


class LinkSpecifier(object):
    '''.. note:: tor-spec, Section 5.1.2'''

    def __init__(self, path_node, legacy=False):
        '''
        :param bool legacy: if **True**, make a legacy link specifier.
            make an IPv4 or IPv6 link specifier otherwise according to
            the relay's public IP address.
        '''
        if legacy is True:
            self.lstype = DEF.LSTYPE_LEGACY
            self.lslen = DEF.LSLEN_LEGACY
            self.lspec = decodeMicrodescriptorIdentifier(
                                                    path_node.microdescriptor)
        else:
            address = path_node.router_status_entry.address
            addr = ipaddress.ip_address(unicode(address))
            port = path_node.router_status_entry.or_port
            if isinstance(addr, ipaddress.IPv4Address):
                self.lstype = DEF.LSTYPE_IPv4
                self.lslen = DEF.LSLEN_IPv4
            else:
                self.lstype = DEF.LSTYPE_IPv6
                self.lslen = DEF.LSLEN_IPv6

            self.lspec = addr.packed + struct.pack('!H', port)

        if len(self.lspec) != self.lslen:

# Path: oppy/cell/exceptions.py
# class BadLinkSpecifier(Exception):
#     pass
# 
# class BadPayloadData(Exception):
#     pass
# 
# Path: oppy/util/tools.py
# def decodeMicrodescriptorIdentifier(microdescriptor):
#     ident = microdescriptor.identifier
#     short = 4-len(ident)%4
#     if short:
#         ident += '='*short
#     return base64.b64decode(ident).rstrip('=')


# Path: oppy/cell/util.py
import ipaddress
import struct
import oppy.cell.definitions as DEF
from oppy.cell.exceptions import BadLinkSpecifier, BadPayloadData
from oppy.util.tools import decodeMicrodescriptorIdentifier



class LinkSpecifier(object):
    '''.. note:: tor-spec, Section 5.1.2'''

    def __init__(self, path_node, legacy=False):
        '''
        :param bool legacy: if **True**, make a legacy link specifier.
            make an IPv4 or IPv6 link specifier otherwise according to
            the relay's public IP address.
        '''
        if legacy is True:
            self.lstype = DEF.LSTYPE_LEGACY
            self.lslen = DEF.LSLEN_LEGACY
            self.lspec = decodeMicrodescriptorIdentifier(
                                                    path_node.microdescriptor)
        else:
            address = path_node.router_status_entry.address
            addr = ipaddress.ip_address(unicode(address))
            port = path_node.router_status_entry.or_port
            if isinstance(addr, ipaddress.IPv4Address):
                self.lstype = DEF.LSTYPE_IPv4
                self.lslen = DEF.LSLEN_IPv4
            else:
                self.lstype = DEF.LSTYPE_IPv6
                self.lslen = DEF.LSLEN_IPv6

            self.lspec = addr.packed + struct.pack('!H', port)

        if len(self.lspec) != self.lslen:

            raise BadLinkSpecifier()