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, customers):
        cls.entries = entries
        cls.customers = customers
        
    @classmethod
    def register(cls, dynid, subdomain, zone, sharedSecret, checksum):
        try:
            customer = AdminFuncs.customers[zone]
        except KeyError:
            raise AdminFuncException("access denied")

        adminPwd = customer.adminPwd
        maxEntries = customer.maxEntries
        
        di = "%s %s %s %s %s" % (dynid, subdomain, zone, sharedSecret, adminPwd)
        d = md5.new(di).hexdigest()
        Logger.debug("%s, received: %s, calculated: %s" % (di, checksum, d))
        if d != checksum:
            raise AdminFuncException("access denied")
    
        if AdminFuncs.entries.has_key(dynid):
            raise AdminFuncException("duplicate dynid")

        entryCnt = 0
        for entry in AdminFuncs.entries.values():
            if entry.zone == zone:
                entryCnt += 1
            if entry.name == subdomain and entry.zone == zone:
                raise AdminFuncException("duplicate full name")

        if entryCnt >= maxEntries and maxEntries != 0:
            raise AdminFuncException("too much entries")
            
        newEntry = Entry.Entry(dynid, sharedSecret, subdomain, zone)
        AdminFuncs.entries[dynid] = newEntry