import md5
from logger import Logger
import Entry

class AdminFuncException(Exception):
    def __init__(self, msg):
        Logger.log("Exception in AdminFuncs: %s" % msg)
        self.msg = msg

class AdminFuncs(object):
    @classmethod
    def setParams(cls, entries, adminPwd):
        cls.entries = entries
        cls.adminPwd = adminPwd
        
    @classmethod
    def register(cls, dynid, subdomain, zone, sharedSecret, checksum):
        di = "%s %s %s %s %s" % (dynid, subdomain, zone, sharedSecret, AdminFuncs.adminPwd)
        d = md5.new(di).hexdigest()
        Logger.debug("%s, received: %s, calculated: %s" % (di, checksum, d))
        if d != checksum:
            raise AdminFuncException("access denied: %s" % di)
    
        if AdminFuncs.entries.has_key(dynid):
            raise AdminFuncException("duplicate dynid")

        for entry in AdminFuncs.entries.values():
            if entry.name == subdomain and entry.zone == zone:
                raise AdminFuncException("duplicate full name")

        newEntry = Entry.Entry(dynid, sharedSecret, subdomain, zone)
        AdminFuncs.entries[dynid] = newEntry