async def price_ask(
call: types.CallbackQuery, order: Mapping[str, Any], price_currency: str
):
"""Edit currency of price in message to ``price_currency`` field value."""
if price_currency == "sell":
answer = i18n("ask_buy_price {of_currency} {per_currency}").format(
of_currency=order["sell"], per_currency=order["buy"]
)
callback_command = "buy"
else:
answer = (
i18n("ask_sell_price {of_currency} {per_currency}").format(
of_currency=order["buy"], per_currency=order["sell"]
),
)
callback_command = "sell"
buttons = await inline_control_buttons()
callback_data = f"price {callback_command}"
buttons.insert(
0, [InlineKeyboardButton(i18n("invert"), callback_data=callback_data)],
)
await tg.edit_message_text(
answer,
call.message.chat.id,
call.message.message_id,
reply_markup=InlineKeyboardMarkup(inline_keyboard=buttons),
)
async def choose_sell(message: types.Message, state: FSMContext):
"""Set currency user wants to sell and ask for price."""
if message.text.startswith(emojize(":fast_reverse_button:")):
await OrderCreation.buy.set()
await tg.send_message(
message.chat.id,
i18n("ask_buy_currency"),
reply_markup=whitelist.currency_keyboard("buy"),
)
return
elif message.text.startswith(emojize(":x:")):
await cancel_order_creation(message.from_user.id, message.chat.id)
return
match = await match_currency("sell", message)
if not match:
return
order = await database.creation.find_one_and_update(
{"user_id": message.from_user.id, "buy": {"$ne": match}},
{"$set": {"sell": match, "price_currency": "sell"}},
return_document=ReturnDocument.AFTER,
)
if not order:
await tg.send_message(
message.chat.id,
i18n("same_currency_error"),
reply_markup=whitelist.currency_keyboard("sell"),
)
return
await set_price_state(message, order)
async def change_state(call: types.CallbackQuery, state: FSMContext):
"""React to back/skip button query."""
args = call.data.split()
query_state_name = args[1]
direction = args[2]
state_name = await state.get_state()
if state_name != query_state_name:
return await call.answer(i18n("wrong_button"))
if state_name in OrderCreation.all_states_names:
if direction == "back":
new_state = await OrderCreation.previous()
elif direction == "skip":
new_state = await OrderCreation.next()
handler = state_handlers.get(new_state)
if handler:
error = await handler(call)
if not error:
return await call.answer()
await state.set_state(state_name)
if direction == "back":
answer = i18n("back_error")
elif direction == "skip":
answer = i18n("skip_error")
return await call.answer(answer)
async def delete_button(call: types.CallbackQuery, order: OrderType):
"""React to "Delete" button by asking user to confirm deletion."""
args = call.data.split()
location_message_id = int(args[2])
show_id = call.message.text.startswith("ID")
keyboard = types.InlineKeyboardMarkup()
keyboard.row(
types.InlineKeyboardButton(
i18n("totally_sure"),
callback_data="confirm_delete {} {}".format(
order["_id"], location_message_id
),
)
)
keyboard.row(
types.InlineKeyboardButton(
i18n("no"),
callback_data="revert {} {} 0 {}".format(
order["_id"], location_message_id, int(show_id)
),
)
)
await tg.edit_message_text(
i18n("delete_order_confirmation"),
call.message.chat.id,
call.message.message_id,
reply_markup=keyboard,
)
async def set_name(message: types.Message, offer: EscrowOffer):
"""Set fiat sender's name on card and ask for first and last 4 digits."""
name = message.text.split()
if len(name) != 3:
await tg.send_message(
message.chat.id,
i18n("wrong_word_count {word_count}").format(word_count=3),
)
return
name[2] = name[2][0] + "." # Leaving the first letter of surname with dot
if offer.type == "buy":
user_field = "counter"
currency = offer.sell
else:
user_field = "init"
currency = offer.buy
await offer.update_document(
{"$set": {
f"{user_field}.name": " ".join(name).upper()
}})
await tg.send_message(
message.chat.id,
i18n("send_first_and_last_4_digits_of_card_number {currency}").format(
currency=currency),
)
await states.Escrow.send_card_number.set()
async def claim_currency(call: types.CallbackQuery):
"""Set cashback currency and suggest last escrow address."""
currency = call.data.split()[1]
cursor = (database.cashback.find({
"id": call.from_user.id,
"currency": currency,
"address": {
"$ne": None
}
}).sort("time", pymongo.DESCENDING).limit(1))
last_cashback = await cursor.to_list(length=1)
if last_cashback:
address = last_cashback[0]["address"]
keyboard = InlineKeyboardMarkup(row_width=1)
keyboard.add(
InlineKeyboardButton(
i18n("confirm_cashback_address"),
callback_data=f"claim_transfer {currency} {address}",
),
InlineKeyboardButton(
i18n("custom_cashback_address"),
callback_data=f"custom_cashback_address {currency}",
),
)
await call.answer()
await tg.edit_message_text(
i18n("use_cashback_address {address}").format(
address=markdown.code(address)),
call.message.chat.id,
call.message.message_id,
reply_markup=keyboard,
parse_mode=ParseMode.MARKDOWN,
)
else:
return await custom_cashback_address(call)
async def whitelisting_request(call: types.CallbackQuery):
"""Send whitelisting request to support or increment requests count."""
currency = call.data.split()[1]
request = await database.whitelisting_requests.find_one_and_update(
{"_id": currency},
{"$addToSet": {"users": call.from_user.id}},
upsert=True,
return_document=ReturnDocument.BEFORE,
)
double_request = False
if request:
if call.from_user.id in request["users"]:
double_request = True
else:
support_text = emojize(":label: #whitelisting_request {} - {}.").format(
currency, len(request["users"]) + 1
)
if len(request["users"]) == 1:
message = await tg.send_message(config.SUPPORT_CHAT_ID, support_text)
await database.whitelisting_requests.update_one(
{"_id": request["_id"]},
{"$set": {"message_id": message.message_id}},
)
else:
await tg.edit_message_text(
support_text, config.SUPPORT_CHAT_ID, request["message_id"],
)
await call.answer()
await tg.send_message(
call.message.chat.id,
i18n("double_request") if double_request else i18n("request_sent"),
)
async def choose_duration(message: types.Message, state: FSMContext):
"""Set duration and ask for comments."""
try:
duration = int(message.text)
if duration <= 0:
raise ValueError
except ValueError:
await tg.send_message(message.chat.id, i18n("send_natural_number"))
return
if duration > config.ORDER_DURATION_LIMIT:
await tg.send_message(
message.chat.id,
i18n("exceeded_duration_limit {limit}").format(
limit=config.ORDER_DURATION_LIMIT),
)
return
await database.creation.update_one({"user_id": message.from_user.id},
{"$set": {
"duration": duration
}})
await OrderCreation.comments.set()
await tg.send_message(
message.chat.id,
i18n("ask_comments"),
reply_markup=InlineKeyboardMarkup(
inline_keyboard=await inline_control_buttons()),
)
async def choose_bank(call: types.CallbackQuery, offer: EscrowOffer):
"""Set chosen bank and continue.
Because bank is chosen by initiator, ask for receive address if
they receive escrow asset.
"""
bank = call.data.split()[2]
if bank not in SUPPORTED_BANKS:
await call.answer(i18n("bank_not_supported"))
return
update_dict = {"bank": bank}
await call.answer()
update_dict["pending_input_from"] = call.from_user.id
await offer.update_document({"$set": update_dict})
if offer.sell == "RUB":
await tg.send_message(
call.message.chat.id,
i18n("send_first_and_last_4_digits_of_card_number {currency}").
format(currency=offer.sell),
)
await states.Escrow.receive_card_number.set()
else:
await tg.send_message(
call.message.chat.id,
i18n("ask_address {currency}").format(currency=offer.sell),
)
await states.Escrow.receive_address.set()
async def get_referral_link(message: types.Message):
"""Send user's referral link and generate if it doesn't exist."""
user = database_user.get()
code = user.get("referral_code")
if code is None:
while True:
cryptogen = SystemRandom()
code = "".join(cryptogen.choice(ascii_lowercase) for _ in range(7))
try:
await database.users.update_one(
{"_id": user["_id"]}, {"$set": {
"referral_code": code
}})
except DuplicateKeyError:
continue
else:
break
me = await tg.me
answer = i18n("referral_share {link}").format(
link=f"https://t.me/{me.username}?start={code}")
if message.from_user.username:
answer += "\n" + i18n("referral_share_alias {link}").format(
link=
f"https://t.me/{me.username}?start=_{message.from_user.username}")
await tg.send_message(
message.chat.id,
answer,
disable_web_page_preview=True,
reply_markup=start_keyboard(),
)
async def choose_buy_gateway(message: types.Message, state: FSMContext):
"""Set gateway of buy currency and ask for sell currency."""
if message.text.startswith(emojize(":fast_reverse_button:")):
await OrderCreation.previous()
await tg.send_message(
message.chat.id,
i18n("ask_buy_currency"),
reply_markup=whitelist.currency_keyboard("buy"),
)
return
elif message.text.startswith(emojize(":x:")):
await cancel_order_creation(message.from_user.id, message.chat.id)
return
elif not message.text.startswith(emojize(":fast_forward:")):
gateway_result = await get_currency_with_gateway("buy", message)
if not gateway_result:
return
order, currency = gateway_result
await database.creation.update_one({"_id": order["_id"]},
{"$set": {
"buy": currency
}})
await OrderCreation.sell.set()
await tg.send_message(
message.chat.id,
i18n("ask_sell_currency"),
reply_markup=whitelist.currency_keyboard("sell"),
)
async def full_card_number_sent(call: types.CallbackQuery, offer: EscrowOffer):
"""Confirm that full card number is sent and ask for first and last 4 digits."""
await offer.update_document(
{"$set": {
"pending_input_from": call.from_user.id
}})
await call.answer()
if call.from_user.id == offer.init["id"]:
counter = offer.counter
await tg.send_message(
counter["id"],
i18n("ask_address {currency}").format(currency=offer.buy))
await tg.send_message(
call.message.chat.id,
i18n("exchange_continued {user}").format(
user=markdown.link(counter["mention"],
User(id=counter["id"]).url)),
parse_mode=ParseMode.MARKDOWN,
)
await offer.update_document(
{"$set": {
"pending_input_from": counter["id"]
}})
counter_state = FSMContext(dp.storage, counter["id"], counter["id"])
await counter_state.set_state(states.Escrow.receive_address.state)
await states.Escrow.receive_card_number.set()
else:
await tg.send_message(
call.message.chat.id,
i18n("send_first_and_last_4_digits_of_card_number {currency}").
format(currency=offer.sell if offer.type == "buy" else offer.buy),
)
await states.Escrow.receive_card_number.set()
async def archive_button(call: types.CallbackQuery, order: OrderType):
"""React to "Archive" or "Unarchive" button by flipping archived flag."""
args = call.data.split()
archived = order.get("archived")
if archived:
update_dict = {"$unset": {"archived": True}, "$set": {"notify": True}}
else:
update_dict = {"$set": {"archived": True, "notify": False}}
order = await database.orders.find_one_and_update(
{"_id": ObjectId(args[1]), "user_id": call.from_user.id},
update_dict,
return_document=pymongo.ReturnDocument.AFTER,
)
if not order:
await call.answer(
i18n("unarchive_order_error") if archived else i18n("archive_order_error")
)
return
await call.answer()
await show_order(
order,
call.message.chat.id,
call.from_user.id,
message_id=call.message.message_id,
location_message_id=int(args[2]),
show_id=call.message.text.startswith("ID"),
)
async def handle_start_command(message: types.Message, state: FSMContext):
"""Handle /start.
Ask for language if user is new or show menu.
"""
user = {"id": message.from_user.id, "chat": message.chat.id}
result = await database.users.update_one(user, {"$setOnInsert": user}, upsert=True)
if not result.matched_count:
keyboard = InlineKeyboardMarkup()
for language in i18n.available_locales:
keyboard.row(
InlineKeyboardButton(
Locale(language).display_name,
callback_data="locale {}".format(language),
)
)
await tg.send_message(
message.chat.id, i18n("choose_language"), reply_markup=keyboard
)
return
await state.finish()
await tg.send_message(
message.chat.id, i18n("help_message"), reply_markup=start_keyboard()
)
async def handle_create(message: types.Message, state: FSMContext):
"""Start order creation by asking user for currency they want to buy."""
current_time = time()
user_orders = await database.orders.count_documents(
{
"user_id": message.from_user.id,
"start_time": {"$gt": current_time - config.ORDERS_LIMIT_HOURS * 3600},
}
)
if user_orders >= config.ORDERS_LIMIT_COUNT:
await tg.send_message(
message.chat.id,
i18n("exceeded_order_creation_time_limit {orders} {hours}").format(
orders=config.ORDERS_LIMIT_COUNT, hours=config.ORDERS_LIMIT_HOURS
),
)
return
creation = {"user_id": message.from_user.id}
await database.creation.find_one_and_replace(creation, creation, upsert=True)
await states.OrderCreation.first()
await tg.send_message(
message.chat.id,
i18n("ask_buy_currency"),
reply_markup=whitelist.currency_keyboard("buy"),
)
async def sum_handler(call: types.CallbackQuery):
"""Ask for sum currency."""
order = await database.creation.find_one_and_update(
{"user_id": call.from_user.id}, {"$unset": {
"price_currency": True
}})
if not order:
await call.answer(i18n("no_creation"))
return True
keyboard = InlineKeyboardMarkup()
keyboard.add(
InlineKeyboardButton(order["buy"], callback_data="sum buy"),
InlineKeyboardButton(order["sell"], callback_data="sum sell"),
)
for row in await inline_control_buttons():
keyboard.row(*row)
await tg.edit_message_text(
i18n("ask_sum_currency"),
call.message.chat.id,
call.message.message_id,
reply_markup=keyboard,
)
async def search_by_creator(message: types.Message, state: FSMContext):
"""Search orders by creator.
Creator is indicated with username (with or without @) or user ID
after **/creator** or **/c** in message text.
In contrast to usernames and user IDs, names aren't unique and
therefore not supported.
"""
query: typing.Dict[str, typing.Any] = {
"$or": [{
"archived": {
"$exists": False
}
}, {
"archived": False
}],
"expiration_time": {
"$gt": time()
},
}
source = message.text.split()
try:
creator = source[1]
if creator.isdigit():
query["user_id"] = int(creator)
else:
mention_regexp = f"^{creator}$" if creator[
0] == "@" else f"^@{creator}$"
user = await database.users.find_one({
"mention":
re.compile(mention_regexp, re.IGNORECASE),
"has_username":
True,
})
if user:
query["user_id"] = user["id"]
else:
await tg.send_message(message.chat.id, i18n("user_not_found"))
return
except IndexError:
await tg.send_message(
message.chat.id,
i18n("no_user_argument"),
)
return
cursor = database.orders.find(query).sort("start_time", DESCENDING)
quantity = await database.orders.count_documents(query)
await state.finish()
await orders_list(cursor,
message.chat.id,
0,
quantity,
"orders",
user_id=message.from_user.id)
async def choose_sell_gateway(message: types.Message, state: FSMContext):
"""Set gateway of sell currency and ask for price."""
if message.text.startswith(emojize(":fast_reverse_button:")):
await OrderCreation.previous()
await tg.send_message(
message.chat.id,
i18n("ask_sell_currency"),
reply_markup=whitelist.currency_keyboard("sell"),
)
return
elif message.text.startswith(emojize(":x:")):
await cancel_order_creation(message.from_user.id, message.chat.id)
return
same_gateway = False
if not message.text.startswith(emojize(":fast_forward:")):
gateway_result = await get_currency_with_gateway("sell", message)
if not gateway_result:
return
order, currency = gateway_result
if currency == order["buy"]:
same_gateway = True
else:
await database.creation.update_one(
{"_id": order["_id"]},
{"$set": {
"sell": currency,
"price_currency": "sell"
}},
)
else:
order = await database.creation.find_one_and_update(
{
"user_id": message.from_user.id,
"$expr": {
"$ne": ["$buy", "$sell"]
}
},
{"$set": {
"price_currency": "sell"
}},
return_document=ReturnDocument.AFTER,
)
if not order:
order = await database.creation.find_one(
{"user_id": message.from_user.id})
same_gateway = True
if same_gateway:
await tg.send_message(
message.chat.id,
i18n("same_gateway_error"),
reply_markup=whitelist.gateway_keyboard(order["sell"], "sell"),
)
else:
await set_price_state(message, order)
async def help_command(message: types.Message):
"""Handle request to support."""
await states.asking_support.set()
await tg.send_message(
message.chat.id,
i18n("request_question"),
reply_markup=InlineKeyboardMarkup(inline_keyboard=[[
InlineKeyboardButton(i18n("cancel"), callback_data="unhelp")
]]),
)
async def decline_offer(call: types.CallbackQuery, offer: EscrowOffer):
"""React to counteragent declining offer."""
offer.react_time = time()
await offer.delete_document()
await tg.send_message(
offer.init["id"],
i18n("escrow_offer_declined", locale=offer.init["locale"]),
)
await call.answer()
await tg.send_message(call.message.chat.id, i18n("offer_declined"))
def gateway_keyboard(currency: str, currency_type: str) -> ReplyKeyboardMarkup:
"""Get keyboard with gateways of ``currency`` from whitelist."""
keyboard = ReplyKeyboardMarkup(row_width=5,
one_time_keyboard=currency_type == "sell")
keyboard.add(*[KeyboardButton(g) for g in CRYPTOCURRENCY[currency]])
keyboard.row(
KeyboardButton(emojize(":fast_reverse_button: ") + i18n("back")),
KeyboardButton(emojize(":fast_forward: ") + i18n("without_gateway")),
KeyboardButton(emojize(":x: ") + i18n("cancel")),
)
return keyboard
async def toggle_escrow(message: types.Message):
"""Toggle escrow availability.
This command makes creation of new escrow offers unavailable if
escrow is enabled, and makes it available if it's disabled.
"""
config.ESCROW_ENABLED = not config.ESCROW_ENABLED
if config.ESCROW_ENABLED:
await tg.send_message(message.chat.id, i18n("escrow_enabled"))
else:
await tg.send_message(message.chat.id, i18n("escrow_disabled"))
async def set_price_state(message: types.Message, order: Mapping[str, Any]):
"""Ask for price."""
await OrderCreation.price.set()
buttons = await inline_control_buttons(back=False)
buttons.insert(
0, [InlineKeyboardButton(i18n("invert"), callback_data="price buy")])
await tg.send_message(
message.chat.id,
i18n("ask_buy_price {of_currency} {per_currency}").format(
of_currency=order["sell"], per_currency=order["buy"]),
reply_markup=InlineKeyboardMarkup(inline_keyboard=buttons),
)
async def set_escrow_sum(message: types.Message, offer: EscrowOffer):
"""Set sum and ask for fee payment agreement."""
try:
offer_sum = money(message.text)
except MoneyValueError as exception:
await tg.send_message(message.chat.id, str(exception))
return
order = await database.orders.find_one({"_id": offer.order})
order_sum = order.get(offer.sum_currency)
if order_sum and offer_sum > order_sum.to_decimal():
await tg.send_message(message.chat.id, i18n("exceeded_order_sum"))
return
update_dict = {offer.sum_currency: Decimal128(offer_sum)}
new_currency = "sell" if offer.sum_currency == "sum_buy" else "buy"
update_dict[f"sum_{new_currency}"] = Decimal128(
normalize(offer_sum * order[f"price_{new_currency}"].to_decimal()))
escrow_sum = update_dict[f"sum_{offer.type}"]
escrow_fee = Decimal(config.ESCROW_FEE_PERCENTS) / Decimal("100")
update_dict["sum_fee_up"] = Decimal128(
normalize(escrow_sum.to_decimal() * (Decimal("1") + escrow_fee)))
update_dict["sum_fee_down"] = Decimal128(
normalize(escrow_sum.to_decimal() * (Decimal("1") - escrow_fee)))
offer = replace(offer, **update_dict) # type: ignore
if offer.sum_currency == offer.type:
insured = await get_insurance(offer)
update_dict["insured"] = Decimal128(insured)
if offer_sum > insured:
keyboard = InlineKeyboardMarkup()
keyboard.add(
InlineKeyboardButton(
i18n("continue"),
callback_data=f"accept_insurance {offer._id}"),
InlineKeyboardButton(i18n("cancel"),
callback_data=f"init_cancel {offer._id}"),
)
answer = i18n("exceeded_insurance {amount} {currency}").format(
amount=insured, currency=offer.escrow)
answer += "\n" + i18n("exceeded_insurance_options")
await tg.send_message(message.chat.id,
answer,
reply_markup=keyboard)
else:
await ask_fee(message.from_user.id, message.chat.id, offer)
await offer.update_document({
"$set": update_dict,
"$unset": {
"sum_currency": True
}
})
async def final_offer_confirmation(call: types.CallbackQuery,
offer: EscrowOffer):
"""Ask not escrow asset receiver to confirm transfer."""
if not offer.unsent:
await call.answer(i18n("transfer_already_confirmed"))
return
await offer.update_document({"$unset": {"unsent": True}})
if offer.type == "buy":
confirm_user = offer.init
other_user = offer.counter
currency = offer.sell
elif offer.type == "sell":
confirm_user = offer.counter
other_user = offer.init
currency = offer.buy
keyboard = InlineKeyboardMarkup()
keyboard.add(
InlineKeyboardButton(
i18n("yes", locale=confirm_user["locale"]),
callback_data=f"escrow_complete {offer._id}",
))
reply = await tg.send_message(
confirm_user["id"],
i18n("receiving_confirmation {currency} {user}",
locale=confirm_user["locale"]).format(
currency=currency, user=other_user["send_address"]),
reply_markup=keyboard,
)
keyboard.add(
InlineKeyboardButton(
i18n("no", locale=confirm_user["locale"]),
callback_data=f"escrow_validate {offer._id}",
))
await call_later(
60 * 10,
edit_keyboard,
offer._id,
confirm_user["id"],
reply.message_id,
keyboard,
)
await call.answer()
await tg.send_message(
other_user["id"],
i18n(
"complete_escrow_promise",
locale=other_user["locale"],
),
reply_markup=start_keyboard(),
)
def start_keyboard() -> types.ReplyKeyboardMarkup:
"""Create reply keyboard with main menu."""
keyboard = types.ReplyKeyboardMarkup(resize_keyboard=True, row_width=2)
keyboard.add(
types.KeyboardButton(
emojize(":heavy_plus_sign: ") + i18n("create_order")),
types.KeyboardButton(
emojize(":bust_in_silhouette: ") + i18n("my_orders")),
types.KeyboardButton(emojize(":closed_book: ") + i18n("order_book")),
types.KeyboardButton(emojize(":abcd: ") + i18n("language")),
types.KeyboardButton(emojize(":question: ") + i18n("support")),
)
return keyboard
async def cancel_order_creation(user_id: int, chat_id: int):
"""Cancel order creation."""
await dp.get_current().current_state().finish()
order = await database.creation.delete_one({"user_id": user_id})
if not order.deleted_count:
await tg.send_message(
chat_id, i18n("no_creation"), reply_markup=start_keyboard(),
)
return True
await tg.send_message(
chat_id, i18n("order_cancelled"), reply_markup=start_keyboard()
)
def currency_keyboard(currency_type: str) -> ReplyKeyboardMarkup:
"""Get keyboard with currencies from whitelists."""
keyboard = ReplyKeyboardMarkup(row_width=5,
one_time_keyboard=currency_type == "sell")
keyboard.row(*[KeyboardButton(c) for c in FIAT])
keyboard.add(*[KeyboardButton(c) for c in CRYPTOCURRENCY])
cancel_button = KeyboardButton(emojize(":x: ") + i18n("cancel"))
if currency_type == "sell":
keyboard.row(
KeyboardButton(emojize(":fast_reverse_button: ") + i18n("back")),
cancel_button,
)
else:
keyboard.row(cancel_button)
return keyboard
async def set_receive_card_number(message: types.Message, offer: EscrowOffer):
"""Create address from first and last 4 digits of card number and ask send address.
First and last 4 digits of card number are sent by fiat receiver,
so their send address is escrow asset address.
"""
card_number = await get_card_number(message.text, message.chat.id)
if not card_number:
return
if message.from_user.id == offer.init["id"]:
user_field = "init"
else:
user_field = "counter"
await offer.update_document({
"$set": {
f"{user_field}.receive_address": ("*" * 8).join(card_number)
}
})
await tg.send_message(
message.chat.id,
i18n("ask_address {currency}").format(currency=offer.escrow),
)
await states.Escrow.send_address.set()
async def get_card_number(
text: str, chat_id: int) -> typing.Optional[typing.Tuple[str, str]]:
"""Parse first and last 4 digits from card number in ``text``.
If parsing is unsuccessful, send warning to ``chat_id`` and return
None. Otherwise return tuple of first and last 4 digits of card number.
"""
if len(text) < 8:
await tg.send_message(chat_id, i18n("send_at_least_8_digits"))
return None
first = text[:4]
last = text[-4:]
if not first.isdigit() or not last.isdigit():
await tg.send_message(chat_id, i18n("digits_parsing_error"))
return None
return (first, last)
