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dialog.py
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dialog.py
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import io
import logging
import pickle
from .connection import FinTSConnectionError
from .exceptions import *
from .formals import CUSTOMER_ID_ANONYMOUS, Language2, SystemIDStatus
from .message import FinTSCustomerMessage, MessageDirection
from .segments.auth import HKIDN2, HKVVB3
from .segments.dialog import HKEND1
from .segments.message import HNHBK3, HNHBS1
from .utils import compress_datablob, decompress_datablob
logger = logging.getLogger(__name__)
DIALOG_ID_UNASSIGNED = '0'
DATA_BLOB_MAGIC = b'python-fints_DIALOG_DATABLOB'
class FinTSDialog:
def __init__(self, client=None, lazy_init=False, enc_mechanism=None, auth_mechanisms=None):
self.client = client
self.next_message_number = dict((v, 1) for v in MessageDirection)
self.messages = dict((v, {}) for v in MessageDirection)
self.auth_mechanisms = auth_mechanisms or []
self.enc_mechanism = enc_mechanism
self.open = False
self.need_init = True
self.lazy_init = lazy_init
self.dialog_id = DIALOG_ID_UNASSIGNED
self.paused = False
self._context_count = 0
def __enter__(self):
if self._context_count == 0:
if not self.lazy_init:
self.init()
self._context_count += 1
return self
def __exit__(self, exc_type, exc_value, traceback):
self._context_count -= 1
if not self.paused:
if self._context_count == 0:
self.end()
def init(self, *extra_segments):
if self.paused:
raise FinTSDialogStateError("Cannot init() a paused dialog")
if self.need_init and not self.open:
segments = [
HKIDN2(
self.client.bank_identifier,
self.client.customer_id,
self.client.system_id,
SystemIDStatus.ID_NECESSARY if self.client.customer_id != CUSTOMER_ID_ANONYMOUS else SystemIDStatus.ID_UNNECESSARY
),
HKVVB3(
self.client.bpd_version,
self.client.upd_version,
Language2.DE,
self.client.product_name,
self.client.product_version
)
]
for s in extra_segments:
segments.append(s)
try:
self.open = True
retval = self.send(*segments, internal_send=True)
self.need_init = False
return retval
except Exception as e:
self.open = False
if isinstance(e, (FinTSConnectionError, FinTSClientError)):
raise
else:
raise FinTSDialogInitError("Couldn't establish dialog with bank, Authentication data wrong?") from e
finally:
self.lazy_init = False
def end(self):
if self.paused:
raise FinTSDialogStateError("Cannot end() on a paused dialog")
if self.open:
response = self.send(HKEND1(self.dialog_id), internal_send=True)
self.open = False
def send(self, *segments, **kwargs):
internal_send = kwargs.pop('internal_send', False)
if self.paused:
raise FinTSDialogStateError("Cannot send() on a paused dialog")
if not self.open:
if self.lazy_init and self.need_init:
self.init()
if not self.open:
raise FinTSDialogStateError("Cannot send on dialog that is not open")
message = self.new_customer_message()
for s in segments:
message += s
self.finish_message(message)
assert message.segments[0].message_number == self.next_message_number[message.DIRECTION]
self.messages[message.DIRECTION][message.segments[0].message_number] = message
self.next_message_number[message.DIRECTION] += 1
response = self.client.connection.send(message)
# assert response.segments[0].message_number == self.next_message_number[response.DIRECTION]
# FIXME Better handling of HKEND in exception case
self.messages[response.DIRECTION][response.segments[0].message_number] = response
self.next_message_number[response.DIRECTION] += 1
if self.enc_mechanism:
self.enc_mechanism.decrypt(message)
for auth_mech in self.auth_mechanisms:
auth_mech.verify(message)
if self.dialog_id == DIALOG_ID_UNASSIGNED:
seg = response.find_segment_first(HNHBK3)
if not seg:
raise FinTSDialogError('Could not find dialog_id')
self.dialog_id = seg.dialog_id
self.client.process_response_message(self, response, internal_send=internal_send)
return response
def new_customer_message(self):
if self.paused:
raise FinTSDialogStateError("Cannot call new_customer_message() on a paused dialog")
message = FinTSCustomerMessage(self)
message += HNHBK3(0, 300, self.dialog_id, self.next_message_number[message.DIRECTION])
for auth_mech in self.auth_mechanisms:
auth_mech.sign_prepare(message)
return message
def finish_message(self, message):
if self.paused:
raise FinTSDialogStateError("Cannot call finish_message() on a paused dialog")
# Create signature(s) in reverse order: from inner to outer
for auth_mech in reversed(self.auth_mechanisms):
auth_mech.sign_commit(message)
message += HNHBS1(message.segments[0].message_number)
if self.enc_mechanism:
self.enc_mechanism.encrypt(message)
message.segments[0].message_size = len(message.render_bytes())
def pause(self):
# FIXME Document, test
if self.paused:
raise FinTSDialogStateError("Cannot pause a paused dialog")
external_dialog = self
external_client = self.client
class SmartPickler(pickle.Pickler):
def persistent_id(self, obj):
if obj is external_dialog:
return "dialog"
if obj is external_client:
return "client"
return None
pickle_out = io.BytesIO()
SmartPickler(pickle_out, protocol=4).dump({
k: getattr(self, k) for k in [
'next_message_number',
'messages',
'auth_mechanisms',
'enc_mechanism',
'open',
'need_init',
'lazy_init',
'dialog_id',
]
})
data_pickled = pickle_out.getvalue()
self.paused = True
return compress_datablob(DATA_BLOB_MAGIC, 1, {'data_bin': data_pickled})
@classmethod
def create_resume(cls, client, blob):
retval = cls(client=client)
decompress_datablob(DATA_BLOB_MAGIC, blob, retval)
return retval
def _set_data_v1(self, data):
external_dialog = self
external_client = self.client
class SmartUnpickler(pickle.Unpickler):
def persistent_load(self, pid):
if pid == 'dialog':
return external_dialog
if pid == 'client':
return external_client
raise pickle.UnpicklingError("unsupported persistent object")
pickle_in = io.BytesIO(data['data_bin'])
data_unpickled = SmartUnpickler(pickle_in).load()
for k, v in data_unpickled.items():
setattr(self, k, v)