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Filename : _except.py
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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Exceptions in L{twisted.mail}.
"""

from __future__ import absolute_import, division

from twisted.python.compat import _PY3, unicode


class IMAP4Exception(Exception):
    pass



class IllegalClientResponse(IMAP4Exception):
    pass



class IllegalOperation(IMAP4Exception):
    pass



class IllegalMailboxEncoding(IMAP4Exception):
    pass



class MailboxException(IMAP4Exception):
    pass



class MailboxCollision(MailboxException):
    def __str__(self):
        return 'Mailbox named %s already exists' % self.args



class NoSuchMailbox(MailboxException):
    def __str__(self):
        return 'No mailbox named %s exists' % self.args



class ReadOnlyMailbox(MailboxException):
    def __str__(self):
        return 'Mailbox open in read-only state'


class UnhandledResponse(IMAP4Exception):
    pass



class NegativeResponse(IMAP4Exception):
    pass



class NoSupportedAuthentication(IMAP4Exception):
    def __init__(self, serverSupports, clientSupports):
        IMAP4Exception.__init__(
            self, 'No supported authentication schemes available')
        self.serverSupports = serverSupports
        self.clientSupports = clientSupports

    def __str__(self):
        return (IMAP4Exception.__str__(self)
            + ': Server supports %r, client supports %r'
            % (self.serverSupports, self.clientSupports))



class IllegalServerResponse(IMAP4Exception):
    pass



class IllegalIdentifierError(IMAP4Exception):
    pass



class IllegalQueryError(IMAP4Exception):
    pass



class MismatchedNesting(IMAP4Exception):
    pass



class MismatchedQuoting(IMAP4Exception):
    pass



class SMTPError(Exception):
    pass



class SMTPClientError(SMTPError):
    """
    Base class for SMTP client errors.
    """
    def __init__(self, code, resp, log=None, addresses=None, isFatal=False,
                 retry=False):
        """
        @param code: The SMTP response code associated with this error.

        @param resp: The string response associated with this error.

        @param log: A string log of the exchange leading up to and including
            the error.
        @type log: L{bytes}

        @param isFatal: A boolean indicating whether this connection can
            proceed or not. If True, the connection will be dropped.

        @param retry: A boolean indicating whether the delivery should be
            retried. If True and the factory indicates further retries are
            desirable, they will be attempted, otherwise the delivery will be
            failed.
        """
        self.code = code
        self.resp = resp
        self.log = log
        self.addresses = addresses
        self.isFatal = isFatal
        self.retry = retry


    def __str__(self):
        if _PY3:
            return self.__bytes__().decode("utf-8")
        else:
            return self.__bytes__()


    def __bytes__(self):
        if self.code > 0:
            res = [u"{:03d} {}".format(self.code, self.resp)]
        else:
            res = [self.resp]
        if self.log:
            res.append(self.log)
            res.append(b'')
        for (i, r) in enumerate(res):
            if isinstance(r, unicode):
                res[i] = r.encode('utf-8')
        return b'\n'.join(res)



class ESMTPClientError(SMTPClientError):
    """
    Base class for ESMTP client errors.
    """



class EHLORequiredError(ESMTPClientError):
    """
    The server does not support EHLO.

    This is considered a non-fatal error (the connection will not be dropped).
    """



class AUTHRequiredError(ESMTPClientError):
    """
    Authentication was required but the server does not support it.

    This is considered a non-fatal error (the connection will not be dropped).
    """



class TLSRequiredError(ESMTPClientError):
    """
    Transport security was required but the server does not support it.

    This is considered a non-fatal error (the connection will not be dropped).
    """



class AUTHDeclinedError(ESMTPClientError):
    """
    The server rejected our credentials.

    Either the username, password, or challenge response
    given to the server was rejected.

    This is considered a non-fatal error (the connection will not be
    dropped).
    """



class AuthenticationError(ESMTPClientError):
    """
    An error occurred while authenticating.

    Either the server rejected our request for authentication or the
    challenge received was malformed.

    This is considered a non-fatal error (the connection will not be
    dropped).
    """



class SMTPTLSError(ESMTPClientError):
    """
    An error occurred while negiotiating for transport security.

    This is considered a non-fatal error (the connection will not be dropped).
    """



class SMTPConnectError(SMTPClientError):
    """
    Failed to connect to the mail exchange host.

    This is considered a fatal error.  A retry will be made.
    """
    def __init__(self, code, resp, log=None, addresses=None, isFatal=True,
                 retry=True):
        SMTPClientError.__init__(self, code, resp, log, addresses, isFatal,
                                 retry)



class SMTPTimeoutError(SMTPClientError):
    """
    Failed to receive a response from the server in the expected time period.

    This is considered a fatal error.  A retry will be made.
    """
    def __init__(self, code, resp, log=None, addresses=None, isFatal=True,
                 retry=True):
        SMTPClientError.__init__(self, code, resp, log, addresses, isFatal,
                                 retry)



class SMTPProtocolError(SMTPClientError):
    """
    The server sent a mangled response.

    This is considered a fatal error.  A retry will not be made.
    """
    def __init__(self, code, resp, log=None, addresses=None, isFatal=True,
                 retry=False):
        SMTPClientError.__init__(self, code, resp, log, addresses, isFatal,
                                 retry)



class SMTPDeliveryError(SMTPClientError):
    """
    Indicates that a delivery attempt has had an error.
    """



class SMTPServerError(SMTPError):
    def __init__(self, code, resp):
        self.code = code
        self.resp = resp


    def __str__(self):
        return "%.3d %s" % (self.code, self.resp)



class SMTPAddressError(SMTPServerError):
    def __init__(self, addr, code, resp):
        from twisted.mail.smtp import Address

        SMTPServerError.__init__(self, code, resp)
        self.addr = Address(addr)


    def __str__(self):
        return "%.3d <%s>... %s" % (self.code, self.addr, self.resp)



class SMTPBadRcpt(SMTPAddressError):
    def __init__(self, addr, code=550,
                 resp='Cannot receive for specified address'):
        SMTPAddressError.__init__(self, addr, code, resp)



class SMTPBadSender(SMTPAddressError):
    def __init__(self, addr, code=550, resp='Sender not acceptable'):
        SMTPAddressError.__init__(self, addr, code, resp)



class AddressError(SMTPError):
    """
    Parse error in address
    """


class POP3Error(Exception):
    """
    The base class for POP3 errors.
    """
    pass



class _POP3MessageDeleted(Exception):
    """
    An internal control-flow error which indicates that a deleted message was
    requested.
    """



class POP3ClientError(Exception):
    """
    The base class for all exceptions raised by POP3Client.
    """



class InsecureAuthenticationDisallowed(POP3ClientError):
    """
    An error indicating secure authentication was required but no mechanism
    could be found.
    """



class TLSError(POP3ClientError):
    """
    An error indicating secure authentication was required but either the
    transport does not support TLS or no TLS context factory was supplied.
    """



class TLSNotSupportedError(POP3ClientError):
    """
    An error indicating secure authentication was required but the server does
    not support TLS.
    """



class ServerErrorResponse(POP3ClientError):
    """
    An error indicating that the server returned an error response to a
    request.

    @ivar consumer: See L{__init__}
    """
    def __init__(self, reason, consumer=None):
        """
        @type reason: L{bytes}
        @param reason: The server response minus the status indicator.

        @type consumer: callable that takes L{object}
        @param consumer: The function meant to handle the values for a
            multi-line response.
        """
        POP3ClientError.__init__(self, reason)
        self.consumer = consumer



class LineTooLong(POP3ClientError):
    """
    An error indicating that the server sent a line which exceeded the
    maximum line length (L{LineOnlyReceiver.MAX_LENGTH}).
    """