from datetime import timedelta from django.utils import timezone from api.lightning.node import LNNode from django.db.models import Q from api.models import Order, LNPayment, MarketTick, User, Currency from api.tasks import send_message from decouple import config import math import ast import time FEE = float(config("FEE")) MAKER_FEE_SPLIT = float(config("MAKER_FEE_SPLIT")) ESCROW_USERNAME = config("ESCROW_USERNAME") PENALTY_TIMEOUT = int(config("PENALTY_TIMEOUT")) MIN_TRADE = int(config("MIN_TRADE")) MAX_TRADE = int(config("MAX_TRADE")) EXP_MAKER_BOND_INVOICE = int(config("EXP_MAKER_BOND_INVOICE")) EXP_TAKER_BOND_INVOICE = int(config("EXP_TAKER_BOND_INVOICE")) BOND_EXPIRY = int(config("BOND_EXPIRY")) ESCROW_EXPIRY = int(config("ESCROW_EXPIRY")) INVOICE_AND_ESCROW_DURATION = int(config("INVOICE_AND_ESCROW_DURATION")) FIAT_EXCHANGE_DURATION = int(config("FIAT_EXCHANGE_DURATION")) class Logics: @classmethod def validate_already_maker_or_taker(cls, user): """Validates if a use is already not part of an active order""" active_order_status = [ Order.Status.WFB, Order.Status.PUB, Order.Status.PAU, Order.Status.TAK, Order.Status.WF2, Order.Status.WFE, Order.Status.WFI, Order.Status.CHA, Order.Status.FSE, Order.Status.DIS, Order.Status.WFR, ] """Checks if the user is already partipant of an active order""" queryset = Order.objects.filter(maker=user, status__in=active_order_status) if queryset.exists(): return ( False, { "bad_request": "You are already maker of an active order" }, queryset[0], ) queryset = Order.objects.filter(taker=user, status__in=active_order_status) if queryset.exists(): return ( False, { "bad_request": "You are already taker of an active order" }, queryset[0], ) # Edge case when the user is in an order that is failing payment and he is the buyer queryset = Order.objects.filter(Q(maker=user) | Q(taker=user), status=Order.Status.FAI) if queryset.exists(): order = queryset[0] if cls.is_buyer(order, user): return ( False, { "bad_request": "You are still pending a payment from a recent order" }, order, ) return True, None, None @classmethod def validate_order_size(cls, order): """Validates if order size in Sats is within limits at t0""" if not order.has_range: if order.t0_satoshis > MAX_TRADE: return False, { "bad_request": "Your order is too big. It is worth " + "{:,}".format(order.t0_satoshis) + " Sats now, but the limit is " + "{:,}".format(MAX_TRADE) + " Sats" } if order.t0_satoshis < MIN_TRADE: return False, { "bad_request": "Your order is too small. It is worth " + "{:,}".format(order.t0_satoshis) + " Sats now, but the limit is " + "{:,}".format(MIN_TRADE) + " Sats" } elif order.has_range: min_sats = cls.calc_sats(order.min_amount, order.currency.exchange_rate, order.premium) max_sats = cls.calc_sats(order.max_amount, order.currency.exchange_rate, order.premium) if min_sats > max_sats/1.5: return False, { "bad_request": "Maximum range amount must be at least 50 percent higher than the minimum amount" } elif max_sats > MAX_TRADE: return False, { "bad_request": "Your order maximum amount is too big. It is worth " + "{:,}".format(int(max_sats)) + " Sats now, but the limit is " + "{:,}".format(MAX_TRADE) + " Sats" } elif min_sats < MIN_TRADE: return False, { "bad_request": "Your order minimum amount is too small. It is worth " + "{:,}".format(int(min_sats)) + " Sats now, but the limit is " + "{:,}".format(MIN_TRADE) + " Sats" } elif min_sats < max_sats/5: return False, { "bad_request": f"Your order amount range is too large. Max amount can only be 5 times bigger than min amount" } return True, None def validate_amount_within_range(order, amount): if amount > float(order.max_amount) or amount < float(order.min_amount): return False, { "bad_request": "The amount specified is outside the range specified by the maker" } return True, None def user_activity_status(last_seen): if last_seen > (timezone.now() - timedelta(minutes=2)): return "Active" elif last_seen > (timezone.now() - timedelta(minutes=10)): return "Seen recently" else: return "Inactive" @classmethod def take(cls, order, user, amount=None): is_penalized, time_out = cls.is_penalized(user) if is_penalized: return False, { "bad_request", f"You need to wait {time_out} seconds to take an order", } else: if order.has_range: order.amount= amount order.taker = user order.status = Order.Status.TAK order.expires_at = timezone.now() + timedelta( seconds=order.t_to_expire(Order.Status.TAK)) order.save() # send_message.delay(order.id,'order_taken') # Too spammy return True, None def is_buyer(order, user): is_maker = order.maker == user is_taker = order.taker == user return (is_maker and order.type == Order.Types.BUY) or ( is_taker and order.type == Order.Types.SELL) def is_seller(order, user): is_maker = order.maker == user is_taker = order.taker == user return (is_maker and order.type == Order.Types.SELL) or ( is_taker and order.type == Order.Types.BUY) def calc_sats(amount, exchange_rate, premium): exchange_rate = float(exchange_rate) premium_rate = exchange_rate * (1 + float(premium) / 100) return (float(amount) /premium_rate) * 100 * 1000 * 1000 @classmethod def satoshis_now(cls, order): """checks trade amount in sats""" if order.is_explicit: satoshis_now = order.satoshis else: amount = order.amount if order.amount != None else order.max_amount satoshis_now = cls.calc_sats(amount, order.currency.exchange_rate, order.premium) return int(satoshis_now) def price_and_premium_now(order): """computes order price and premium with current rates""" exchange_rate = float(order.currency.exchange_rate) if not order.is_explicit: premium = order.premium price = exchange_rate * (1 + float(premium) / 100) else: amount = order.amount if not order.has_range else order.max_amount order_rate = float(amount) / (float(order.satoshis) / 100000000) premium = order_rate / exchange_rate - 1 premium = int(premium * 10000) / 100 # 2 decimals left price = order_rate significant_digits = 5 price = round( price, significant_digits - int(math.floor(math.log10(abs(price)))) - 1) return price, premium @classmethod def order_expires(cls, order): """General cases when time runs out.""" # Do not change order status if an order in any with # any of these status is sent to expire here does_not_expire = [ Order.Status.UCA, Order.Status.EXP, Order.Status.TLD, Order.Status.DIS, Order.Status.CCA, Order.Status.PAY, Order.Status.SUC, Order.Status.FAI, Order.Status.MLD, ] if order.status in does_not_expire: return False elif order.status == Order.Status.WFB: order.status = Order.Status.EXP order.expiry_reason = Order.ExpiryReasons.NMBOND cls.cancel_bond(order.maker_bond) order.save() return True elif order.status in [Order.Status.PUB, Order.Status.PAU]: cls.return_bond(order.maker_bond) order.status = Order.Status.EXP order.expiry_reason = Order.ExpiryReasons.NTAKEN order.save() send_message.delay(order.id,'order_expired_untaken') return True elif order.status == Order.Status.TAK: cls.cancel_bond(order.taker_bond) cls.kick_taker(order) # send_message.delay(order.id,'taker_expired_b4bond') # Too spammy return True elif order.status == Order.Status.WF2: """Weird case where an order expires and both participants did not proceed with the contract. Likely the site was down or there was a bug. Still bonds must be charged to avoid service DDOS.""" cls.settle_bond(order.maker_bond) cls.settle_bond(order.taker_bond) cls.cancel_escrow(order) order.status = Order.Status.EXP order.expiry_reason = Order.ExpiryReasons.NESINV order.save() return True elif order.status == Order.Status.WFE: maker_is_seller = cls.is_seller(order, order.maker) # If maker is seller, settle the bond and order goes to expired if maker_is_seller: cls.settle_bond(order.maker_bond) cls.return_bond(order.taker_bond) # If seller is offline the escrow LNpayment does not exist try: cls.cancel_escrow(order) except: pass order.status = Order.Status.EXP order.expiry_reason = Order.ExpiryReasons.NESCRO order.save() # Reward taker with part of the maker bond cls.add_slashed_rewards(order.maker_bond, order.taker.profile) return True # If maker is buyer, settle the taker's bond order goes back to public else: cls.settle_bond(order.taker_bond) # If seller is offline the escrow LNpayment does not even exist try: cls.cancel_escrow(order) except: pass taker_bond = order.taker_bond order.taker = None order.taker_bond = None order.trade_escrow = None order.payout = None cls.publish_order(order) send_message.delay(order.id,'order_published') # Reward maker with part of the taker bond cls.add_slashed_rewards(taker_bond, order.maker.profile) return True elif order.status == Order.Status.WFI: # The trade could happen without a buyer invoice. However, this user # is likely AFK; will probably desert the contract as well. maker_is_buyer = cls.is_buyer(order, order.maker) # If maker is buyer, settle the bond and order goes to expired if maker_is_buyer: cls.settle_bond(order.maker_bond) cls.return_bond(order.taker_bond) cls.return_escrow(order) order.status = Order.Status.EXP order.expiry_reason = Order.ExpiryReasons.NINVOI order.save() # Reward taker with part of the maker bond cls.add_slashed_rewards(order.maker_bond, order.taker.profile) return True # If maker is seller settle the taker's bond, order goes back to public else: cls.settle_bond(order.taker_bond) cls.return_escrow(order) taker_bond = order.taker_bond order.taker = None order.taker_bond = None order.trade_escrow = None cls.publish_order(order) send_message.delay(order.id,'order_published') # Reward maker with part of the taker bond cls.add_slashed_rewards(taker_bond, order.maker.profile) return True elif order.status in [Order.Status.CHA, Order.Status.FSE]: # Another weird case. The time to confirm 'fiat sent or received' expired. Yet no dispute # was opened. Hint: a seller-scammer could persuade a buyer to not click "fiat # sent", we assume this is a dispute case by default. cls.open_dispute(order) return True @classmethod def kick_taker(cls, order): """The taker did not lock the taker_bond. Now he has to go""" # Add a time out to the taker if order.taker: profile = order.taker.profile profile.penalty_expiration = timezone.now() + timedelta( seconds=PENALTY_TIMEOUT) profile.save() # Make order public again order.taker = None order.taker_bond = None cls.publish_order(order) return True @classmethod def open_dispute(cls, order, user=None): # Always settle escrow and bonds during a dispute. Disputes # can take long to resolve, it might trigger force closure # for unresolved HTLCs) Dispute winner will have to submit a # new invoice for value of escrow + bond. if not order.trade_escrow.status == LNPayment.Status.SETLED: cls.settle_escrow(order) cls.settle_bond(order.maker_bond) cls.settle_bond(order.taker_bond) order.is_disputed = True order.status = Order.Status.DIS order.expires_at = timezone.now() + timedelta( seconds=order.t_to_expire(Order.Status.DIS)) order.save() # User could be None if a dispute is open automatically due to weird expiration. if not user == None: profile = user.profile profile.num_disputes = profile.num_disputes + 1 if profile.orders_disputes_started == None: profile.orders_disputes_started = [str(order.id)] else: profile.orders_disputes_started = list( profile.orders_disputes_started).append(str(order.id)) profile.save() return True, None def dispute_statement(order, user, statement): """Updates the dispute statements""" if not order.status == Order.Status.DIS: return False, { "bad_request": "Only orders in dispute accept dispute statements" } if len(statement) > 5000: return False, { "bad_statement": "The statement is longer than 5000 characters" } if len(statement) < 100: return False, { "bad_statement": "The statement is too short. Make sure to be thorough." } if order.maker == user: order.maker_statement = statement else: order.taker_statement = statement # If both statements are in, move status to wait for dispute resolution if order.maker_statement not in [None,""] and order.taker_statement not in [None,""]: order.status = Order.Status.WFR order.expires_at = timezone.now() + timedelta( seconds=order.t_to_expire(Order.Status.WFR)) order.save() return True, None @classmethod def payout_amount(cls, order, user): """Computes buyer invoice amount. Uses order.last_satoshis, that is the final trade amount set at Taker Bond time""" if user == order.maker: fee_fraction = FEE * MAKER_FEE_SPLIT elif user == order.taker: fee_fraction = FEE * (1 - MAKER_FEE_SPLIT) fee_sats = order.last_satoshis * fee_fraction reward_tip = int(config('REWARD_TIP')) if user.profile.is_referred else 0 if cls.is_buyer(order, user): invoice_amount = round(order.last_satoshis - fee_sats - reward_tip) # Trading fee to buyer is charged here. return True, {"invoice_amount": invoice_amount} @classmethod def escrow_amount(cls, order, user): """Computes escrow invoice amount. Uses order.last_satoshis, that is the final trade amount set at Taker Bond time""" if user == order.maker: fee_fraction = FEE * MAKER_FEE_SPLIT elif user == order.taker: fee_fraction = FEE * (1 - MAKER_FEE_SPLIT) fee_sats = order.last_satoshis * fee_fraction reward_tip = int(config('REWARD_TIP')) if user.profile.is_referred else 0 if cls.is_seller(order, user): escrow_amount = round(order.last_satoshis + fee_sats + reward_tip) # Trading fee to seller is charged here. return True, {"escrow_amount": escrow_amount} @classmethod def update_invoice(cls, order, user, invoice): # only the buyer can post a buyer invoice if not cls.is_buyer(order, user): return False, { "bad_request": "Only the buyer of this order can provide a buyer invoice." } if not order.taker_bond: return False, {"bad_request": "Wait for your order to be taken."} if (not (order.taker_bond.status == order.maker_bond.status == LNPayment.Status.LOCKED) and not order.status == Order.Status.FAI): return False, { "bad_request": "You cannot submit a invoice while bonds are not locked." } if order.status == Order.Status.FAI: if order.payout.status != LNPayment.Status.EXPIRE: return False, { "bad_request": "You cannot submit an invoice only after expiration or 3 failed attempts" } num_satoshis = cls.payout_amount(order, user)[1]["invoice_amount"] payout = LNNode.validate_ln_invoice(invoice, num_satoshis) if not payout["valid"]: return False, payout["context"] order.payout, _ = LNPayment.objects.update_or_create( concept=LNPayment.Concepts.PAYBUYER, type=LNPayment.Types.NORM, sender=User.objects.get(username=ESCROW_USERNAME), order_paid= order, # In case this user has other payouts, update the one related to this order. receiver=user, # if there is a LNPayment matching these above, it updates that one with defaults below. defaults={ "invoice": invoice, "status": LNPayment.Status.VALIDI, "num_satoshis": num_satoshis, "description": payout["description"], "payment_hash": payout["payment_hash"], "created_at": payout["created_at"], "expires_at": payout["expires_at"], }, ) # If the order status is 'Waiting for invoice'. Move forward to 'chat' if order.status == Order.Status.WFI: order.status = Order.Status.CHA order.expires_at = timezone.now() + timedelta( seconds=order.t_to_expire(Order.Status.CHA)) send_message.delay(order.id,'fiat_exchange_starts') # If the order status is 'Waiting for both'. Move forward to 'waiting for escrow' if order.status == Order.Status.WF2: # If the escrow does not exist, or is not locked move to WFE. if order.trade_escrow == None: order.status = Order.Status.WFE # If the escrow is locked move to Chat. elif order.trade_escrow.status == LNPayment.Status.LOCKED: order.status = Order.Status.CHA order.expires_at = timezone.now() + timedelta( seconds=order.t_to_expire(Order.Status.CHA)) send_message.delay(order.id,'fiat_exchange_starts') else: order.status = Order.Status.WFE # If the order status is 'Failed Routing'. Retry payment. if order.status == Order.Status.FAI: if LNNode.double_check_htlc_is_settled( order.trade_escrow.payment_hash): order.status = Order.Status.PAY order.payout.status = LNPayment.Status.FLIGHT order.payout.routing_attempts = 0 order.payout.save() order.save() order.save() return True, None def add_profile_rating(profile, rating): """adds a new rating to a user profile""" # TODO Unsafe, does not update ratings, it adds more ratings everytime a new rating is clicked. profile.total_ratings += 1 latest_ratings = profile.latest_ratings if latest_ratings == None: profile.latest_ratings = [rating] profile.avg_rating = rating else: latest_ratings = ast.literal_eval(latest_ratings) latest_ratings.append(rating) profile.latest_ratings = latest_ratings profile.avg_rating = sum(list(map(int, latest_ratings))) / len( latest_ratings ) # Just an average, but it is a list of strings. Has to be converted to int. profile.save() def is_penalized(user): """Checks if a user that is not participant of orders has a limit on taking or making a order""" if user.profile.penalty_expiration: if user.profile.penalty_expiration > timezone.now(): time_out = (user.profile.penalty_expiration - timezone.now()).seconds return True, time_out return False, None @classmethod def cancel_order(cls, order, user, state=None): # Do not change order status if an is in order # any of these status do_not_cancel = [ Order.Status.UCA, Order.Status.EXP, Order.Status.TLD, Order.Status.DIS, Order.Status.CCA, Order.Status.PAY, Order.Status.SUC, Order.Status.FAI, Order.Status.MLD, ] if order.status in do_not_cancel: return False, {"bad_request": "You cannot cancel this order"} # 1) When maker cancels before bond """The order never shows up on the book and order status becomes "cancelled" """ if order.status == Order.Status.WFB and order.maker == user: cls.cancel_bond(order.maker_bond) order.status = Order.Status.UCA order.save() return True, None # 2.a) When maker cancels after bond """The order dissapears from book and goes to cancelled. If strict, maker is charged the bond to prevent DDOS on the LN node and order book. If not strict, maker is returned the bond (more user friendly).""" elif order.status in [Order.Status.PUB, Order.Status.PAU] and order.maker == user: # Return the maker bond (Maker gets returned the bond for cancelling public order) if cls.return_bond(order.maker_bond): order.status = Order.Status.UCA order.save() send_message.delay(order.id,'public_order_cancelled') return True, None # 2.b) When maker cancels after bond and before taker bond is locked """The order dissapears from book and goes to cancelled. The bond maker bond is returned.""" elif order.status == Order.Status.TAK and order.maker == user: # Return the maker bond (Maker gets returned the bond for cancelling public order) if cls.return_bond(order.maker_bond): cls.cancel_bond(order.taker_bond) order.status = Order.Status.UCA order.save() send_message.delay(order.id,'public_order_cancelled') return True, None # 3) When taker cancels before bond """ The order goes back to the book as public. LNPayment "order.taker_bond" is deleted() """ elif order.status == Order.Status.TAK and order.taker == user: # adds a timeout penalty cls.cancel_bond(order.taker_bond) cls.kick_taker(order) # send_message.delay(order.id,'taker_canceled_b4bond') # too spammy return True, None # 4) When taker or maker cancel after bond (before escrow) """The order goes into cancelled status if maker cancels. The order goes into the public book if taker cancels. In both cases there is a small fee.""" # 4.a) When maker cancel after bond (before escrow) """The order into cancelled status if maker cancels.""" elif (order.status in [Order.Status.WF2,Order.Status.WFE] and order.maker == user): # Settle the maker bond (Maker loses the bond for canceling an ongoing trade) valid = cls.settle_bond(order.maker_bond) cls.return_bond(order.taker_bond) # returns taker bond if valid: order.status = Order.Status.UCA order.save() # Reward taker with part of the maker bond cls.add_slashed_rewards(order.maker_bond, order.taker.profile) return True, None # 4.b) When taker cancel after bond (before escrow) """The order into cancelled status if maker cancels.""" elif (order.status in [Order.Status.WF2, Order.Status.WFE] and order.taker == user): # Settle the maker bond (Maker loses the bond for canceling an ongoing trade) valid = cls.settle_bond(order.taker_bond) if valid: order.taker = None order.payout = None order.trade_escrow = None cls.publish_order(order) send_message.delay(order.id,'order_published') # Reward maker with part of the taker bond cls.add_slashed_rewards(order.taker_bond, order.maker.profile) return True, None # 5) When trade collateral has been posted (after escrow) """Always goes to CCA status. Collaboration is needed. When a user asks for cancel, 'order.m/t/aker_asked_cancel' goes True. When the second user asks for cancel. Order is totally cancelled. Must have a small cost for both parties to prevent node DDOS.""" elif order.status in [ Order.Status.WFI, Order.Status.CHA ]: # if the maker had asked, and now the taker does: cancel order, return everything if order.maker_asked_cancel and user == order.taker: cls.collaborative_cancel(order) return True, None # if the taker had asked, and now the maker does: cancel order, return everything elif order.taker_asked_cancel and user == order.maker: cls.collaborative_cancel(order) return True, None # Otherwise just make true the asked for cancel flags elif user == order.taker: order.taker_asked_cancel = True order.save() return True, None elif user == order.maker: order.maker_asked_cancel = True order.save() return True, None else: return False, {"bad_request": "You cannot cancel this order"} @classmethod def collaborative_cancel(cls, order): cls.return_bond(order.maker_bond) cls.return_bond(order.taker_bond) cls.return_escrow(order) order.status = Order.Status.CCA order.save() return @classmethod def publish_order(cls, order): order.status = Order.Status.PUB order.expires_at = order.created_at + timedelta( seconds=order.t_to_expire(Order.Status.PUB)) if order.has_range: order.amount = None order.last_satoshis = cls.satoshis_now(order) order.save() # send_message.delay(order.id,'order_published') # too spammy return @classmethod def is_maker_bond_locked(cls, order): if order.maker_bond.status == LNPayment.Status.LOCKED: return True elif LNNode.validate_hold_invoice_locked(order.maker_bond): cls.publish_order(order) send_message.delay(order.id,'order_published') return True return False @classmethod def gen_maker_hold_invoice(cls, order, user): # Do not gen and cancel if order is older than expiry time if order.expires_at < timezone.now(): cls.order_expires(order) return False, { "bad_request": "Invoice expired. You did not confirm publishing the order in time. Make a new order." } # Return the previous invoice if there was one and is still unpaid if order.maker_bond: if cls.is_maker_bond_locked(order): return False, None elif order.maker_bond.status == LNPayment.Status.INVGEN: return True, { "bond_invoice": order.maker_bond.invoice, "bond_satoshis": order.maker_bond.num_satoshis, } # If there was no maker_bond object yet, generates one order.last_satoshis = cls.satoshis_now(order) bond_satoshis = int(order.last_satoshis * order.bond_size/100) description = f"RoboSats - Publishing '{str(order)}' - Maker bond - This payment WILL FREEZE IN YOUR WALLET, check on the website if it was successful. It will automatically return unless you cheat or cancel unilaterally." # Gen hold Invoice try: hold_payment = LNNode.gen_hold_invoice( bond_satoshis, description, invoice_expiry=order.t_to_expire(Order.Status.WFB), cltv_expiry_secs=BOND_EXPIRY * 3600, ) except Exception as e: print(str(e)) if "failed to connect to all addresses" in str(e): return False, { "bad_request": "The Lightning Network Daemon (LND) is down. Write in the Telegram group to make sure the staff is aware." } if "wallet locked" in str(e): return False, { "bad_request": "This is weird, RoboSats' lightning wallet is locked. Check in the Telegram group, maybe the staff has died." } order.maker_bond = LNPayment.objects.create( concept=LNPayment.Concepts.MAKEBOND, type=LNPayment.Types.HOLD, sender=user, receiver=User.objects.get(username=ESCROW_USERNAME), invoice=hold_payment["invoice"], preimage=hold_payment["preimage"], status=LNPayment.Status.INVGEN, num_satoshis=bond_satoshis, description=description, payment_hash=hold_payment["payment_hash"], created_at=hold_payment["created_at"], expires_at=hold_payment["expires_at"], cltv_expiry=hold_payment["cltv_expiry"], ) order.save() return True, { "bond_invoice": hold_payment["invoice"], "bond_satoshis": bond_satoshis, } @classmethod def finalize_contract(cls, order): """When the taker locks the taker_bond the contract is final""" # THE TRADE AMOUNT IS FINAL WITH THE CONFIRMATION OF THE TAKER BOND! # (This is the last update to "last_satoshis", it becomes the escrow amount next) order.last_satoshis = cls.satoshis_now(order) order.taker_bond.status = LNPayment.Status.LOCKED order.taker_bond.save() # With the bond confirmation the order is extended 'public_order_duration' hours order.expires_at = timezone.now() + timedelta( seconds=order.t_to_expire(Order.Status.WF2)) order.status = Order.Status.WF2 order.save() # Both users profiles are added one more contract // Unsafe can add more than once. order.maker.profile.total_contracts += 1 order.taker.profile.total_contracts += 1 order.maker.profile.save() order.taker.profile.save() # Log a market tick try: MarketTick.log_a_tick(order) except: pass send_message.delay(order.id,'order_taken_confirmed') return True @classmethod def is_taker_bond_locked(cls, order): if order.taker_bond.status == LNPayment.Status.LOCKED: return True elif LNNode.validate_hold_invoice_locked(order.taker_bond): cls.finalize_contract(order) return True return False @classmethod def gen_taker_hold_invoice(cls, order, user): # Do not gen and kick out the taker if order is older than expiry time if order.expires_at < timezone.now(): cls.order_expires(order) return False, { "bad_request": "Invoice expired. You did not confirm taking the order in time." } # Do not gen if a taker invoice exist. Do not return if it is already locked. Return the old one if still waiting. if order.taker_bond: if cls.is_taker_bond_locked(order): return False, None elif order.taker_bond.status == LNPayment.Status.INVGEN: return True, { "bond_invoice": order.taker_bond.invoice, "bond_satoshis": order.taker_bond.num_satoshis, } # If there was no taker_bond object yet, generates one order.last_satoshis = cls.satoshis_now(order) bond_satoshis = int(order.last_satoshis * order.bond_size/100) pos_text = "Buying" if cls.is_buyer(order, user) else "Selling" description = ( f"RoboSats - Taking 'Order {order.id}' {pos_text} BTC for {str(float(order.amount)) + Currency.currency_dict[str(order.currency.currency)]}" + " - Taker bond - This payment WILL FREEZE IN YOUR WALLET, check on the website if it was successful. It will automatically return unless you cheat or cancel unilaterally." ) # Gen hold Invoice try: hold_payment = LNNode.gen_hold_invoice( bond_satoshis, description, invoice_expiry=order.t_to_expire(Order.Status.TAK), cltv_expiry_secs=BOND_EXPIRY * 3600, ) except Exception as e: if "status = StatusCode.UNAVAILABLE" in str(e): return False, { "bad_request": "The Lightning Network Daemon (LND) is down. Write in the Telegram group to make sure the staff is aware." } order.taker_bond = LNPayment.objects.create( concept=LNPayment.Concepts.TAKEBOND, type=LNPayment.Types.HOLD, sender=user, receiver=User.objects.get(username=ESCROW_USERNAME), invoice=hold_payment["invoice"], preimage=hold_payment["preimage"], status=LNPayment.Status.INVGEN, num_satoshis=bond_satoshis, description=description, payment_hash=hold_payment["payment_hash"], created_at=hold_payment["created_at"], expires_at=hold_payment["expires_at"], cltv_expiry=hold_payment["cltv_expiry"], ) order.expires_at = timezone.now() + timedelta( seconds=order.t_to_expire(Order.Status.TAK)) order.save() return True, { "bond_invoice": hold_payment["invoice"], "bond_satoshis": bond_satoshis, } def trade_escrow_received(order): """Moves the order forward""" # If status is 'Waiting for both' move to Waiting for invoice if order.status == Order.Status.WF2: order.status = Order.Status.WFI # If status is 'Waiting for invoice' move to Chat elif order.status == Order.Status.WFE: order.status = Order.Status.CHA order.expires_at = timezone.now() + timedelta( seconds=order.t_to_expire(Order.Status.CHA)) send_message.delay(order.id,'fiat_exchange_starts') order.save() @classmethod def is_trade_escrow_locked(cls, order): if order.trade_escrow.status == LNPayment.Status.LOCKED: return True elif LNNode.validate_hold_invoice_locked(order.trade_escrow): cls.trade_escrow_received(order) return True return False @classmethod def gen_escrow_hold_invoice(cls, order, user): # Do not generate if escrow deposit time has expired if order.expires_at < timezone.now(): cls.order_expires(order) return False, { "bad_request": "Invoice expired. You did not send the escrow in time." } # Do not gen if an escrow invoice exist. Do not return if it is already locked. Return the old one if still waiting. if order.trade_escrow: # Check if status is INVGEN and still not expired if cls.is_trade_escrow_locked(order): return False, None elif order.trade_escrow.status == LNPayment.Status.INVGEN: return True, { "escrow_invoice": order.trade_escrow.invoice, "escrow_satoshis": order.trade_escrow.num_satoshis, } # If there was no taker_bond object yet, generate one escrow_satoshis = cls.escrow_amount(order, user)[1]["escrow_amount"] # Amount was fixed when taker bond was locked, fee applied here description = f"RoboSats - Escrow amount for '{str(order)}' - It WILL FREEZE IN YOUR WALLET. It will be released to the buyer once you confirm you received the fiat. It will automatically return if buyer does not confirm the payment." # Gen hold Invoice try: hold_payment = LNNode.gen_hold_invoice( escrow_satoshis, description, invoice_expiry=order.t_to_expire(Order.Status.WF2), cltv_expiry_secs=ESCROW_EXPIRY * 3600, ) except Exception as e: if "status = StatusCode.UNAVAILABLE" in str(e): return False, { "bad_request": "The Lightning Network Daemon (LND) is down. Write in the Telegram group to make sure the staff is aware." } order.trade_escrow = LNPayment.objects.create( concept=LNPayment.Concepts.TRESCROW, type=LNPayment.Types.HOLD, sender=user, receiver=User.objects.get(username=ESCROW_USERNAME), invoice=hold_payment["invoice"], preimage=hold_payment["preimage"], status=LNPayment.Status.INVGEN, num_satoshis=escrow_satoshis, description=description, payment_hash=hold_payment["payment_hash"], created_at=hold_payment["created_at"], expires_at=hold_payment["expires_at"], cltv_expiry=hold_payment["cltv_expiry"], ) order.save() return True, { "escrow_invoice": hold_payment["invoice"], "escrow_satoshis": escrow_satoshis, } def settle_escrow(order): """Settles the trade escrow hold invoice""" # TODO ERROR HANDLING if LNNode.settle_hold_invoice(order.trade_escrow.preimage): order.trade_escrow.status = LNPayment.Status.SETLED order.trade_escrow.save() return True def settle_bond(bond): """Settles the bond hold invoice""" # TODO ERROR HANDLING if LNNode.settle_hold_invoice(bond.preimage): bond.status = LNPayment.Status.SETLED bond.save() return True def return_escrow(order): """returns the trade escrow""" if LNNode.cancel_return_hold_invoice(order.trade_escrow.payment_hash): order.trade_escrow.status = LNPayment.Status.RETNED order.trade_escrow.save() return True def cancel_escrow(order): """returns the trade escrow""" # Same as return escrow, but used when the invoice was never LOCKED if LNNode.cancel_return_hold_invoice(order.trade_escrow.payment_hash): order.trade_escrow.status = LNPayment.Status.CANCEL order.trade_escrow.save() return True def return_bond(bond): """returns a bond""" if bond == None: return try: LNNode.cancel_return_hold_invoice(bond.payment_hash) bond.status = LNPayment.Status.RETNED bond.save() return True except Exception as e: if "invoice already settled" in str(e): bond.status = LNPayment.Status.SETLED bond.save() return True else: raise e def cancel_bond(bond): """cancel a bond""" # Same as return bond, but used when the invoice was never LOCKED if bond == None: return True try: LNNode.cancel_return_hold_invoice(bond.payment_hash) bond.status = LNPayment.Status.CANCEL bond.save() return True except Exception as e: if "invoice already settled" in str(e): bond.status = LNPayment.Status.SETLED bond.save() return True else: raise e @classmethod def confirm_fiat(cls, order, user): """If Order is in the CHAT states: If user is buyer: fiat_sent goes to true. If User is seller and fiat_sent is true: settle the escrow and pay buyer invoice!""" if (order.status == Order.Status.CHA or order.status == Order.Status.FSE ): # TODO Alternatively, if all collateral is locked? test out # If buyer, settle escrow and mark fiat sent if cls.is_buyer(order, user): order.status = Order.Status.FSE order.is_fiat_sent = True # If seller and fiat was sent, SETTLE ESCROW AND PAY BUYER INVOICE elif cls.is_seller(order, user): if not order.is_fiat_sent: return False, { "bad_request": "You cannot confirm to have received the fiat before it is confirmed to be sent by the buyer." } # Make sure the trade escrow is at least as big as the buyer invoice if order.trade_escrow.num_satoshis <= order.payout.num_satoshis: return False, { "bad_request": "Woah, something broke badly. Report in the public channels, or open a Github Issue." } if cls.settle_escrow( order ): ##### !!! KEY LINE - SETTLES THE TRADE ESCROW !!! order.trade_escrow.status = LNPayment.Status.SETLED # Double check the escrow is settled. if LNNode.double_check_htlc_is_settled( order.trade_escrow.payment_hash): # RETURN THE BONDS // Probably best also do it even if payment failed cls.return_bond(order.taker_bond) cls.return_bond(order.maker_bond) ##### !!! KEY LINE - PAYS THE BUYER INVOICE !!! ##### Background process "follow_invoices" will try to pay this invoice until success order.status = Order.Status.PAY order.payout.status = LNPayment.Status.FLIGHT order.payout.save() order.save() send_message.delay(order.id,'trade_successful') # Add referral rewards (safe) try: cls.add_rewards(order) except: pass return True, None else: return False, { "bad_request": "You cannot confirm the fiat payment at this stage" } order.save() return True, None def pause_unpause_public_order(order,user): if not order.maker == user: return False, { "bad_request": "You cannot pause or unpause an order you did not make" } else: if order.status == Order.Status.PUB: order.status = Order.Status.PAU elif order.status == Order.Status.PAU: order.status = Order.Status.PUB else: return False, { "bad_request": "You can only pause/unpause an order that is either public or paused" } order.save() return True, None @classmethod def rate_counterparty(cls, order, user, rating): ''' Not in use ''' rating_allowed_status = [ Order.Status.PAY, Order.Status.SUC, Order.Status.FAI, Order.Status.MLD, Order.Status.TLD, ] # If the trade is finished if order.status in rating_allowed_status: # if maker, rates taker if order.maker == user and order.maker_rated == False: cls.add_profile_rating(order.taker.profile, rating) order.maker_rated = True order.save() # if taker, rates maker if order.taker == user and order.taker_rated == False: cls.add_profile_rating(order.maker.profile, rating) order.taker_rated = True order.save() else: return False, { "bad_request": "You cannot rate your counterparty yet." } return True, None @classmethod def rate_platform(cls, user, rating): user.profile.platform_rating = rating user.profile.save() return True, None @classmethod def add_rewards(cls, order): ''' This function is called when a trade is finished. If participants of the order were referred, the reward is given to the referees. ''' if order.maker.profile.is_referred: profile = order.maker.profile.referred_by profile.pending_rewards += int(config('REWARD_TIP')) profile.save() if order.taker.profile.is_referred: profile = order.taker.profile.referred_by profile.pending_rewards += int(config('REWARD_TIP')) profile.save() return @classmethod def add_slashed_rewards(cls, bond, profile): ''' When a bond is slashed due to overtime, rewards the user that was waiting. If participants of the order were referred, the reward is given to the referees. ''' reward_fraction = float(config('SLASHED_BOND_REWARD_SPLIT')) reward = int(bond.num_satoshis*reward_fraction) profile.earned_rewards += reward profile.save() return @classmethod def withdraw_rewards(cls, user, invoice): # only a user with positive withdraw balance can use this if user.profile.earned_rewards < 1: return False, {"bad_invoice": "You have not earned rewards"} num_satoshis = user.profile.earned_rewards reward_payout = LNNode.validate_ln_invoice(invoice, num_satoshis) if not reward_payout["valid"]: return False, reward_payout["context"] try: lnpayment = LNPayment.objects.create( concept= LNPayment.Concepts.WITHREWA, type= LNPayment.Types.NORM, sender= User.objects.get(username=ESCROW_USERNAME), status= LNPayment.Status.VALIDI, receiver=user, invoice= invoice, num_satoshis= num_satoshis, description= reward_payout["description"], payment_hash= reward_payout["payment_hash"], created_at= reward_payout["created_at"], expires_at= reward_payout["expires_at"], ) # Might fail if payment_hash already exists in DB except: return False, {"bad_invoice": "Give me a new invoice"} user.profile.earned_rewards = 0 user.profile.save() # Pays the invoice. paid, failure_reason = LNNode.pay_invoice(lnpayment) if paid: user.profile.earned_rewards = 0 user.profile.claimed_rewards += num_satoshis user.profile.save() return True, None # If fails, adds the rewards again. else: user.profile.earned_rewards = num_satoshis user.profile.save() context = {} context['bad_invoice'] = failure_reason return False, context