mirror of
https://github.com/RoboSats/robosats.git
synced 2024-12-13 19:06:26 +00:00
690 lines
29 KiB
Python
690 lines
29 KiB
Python
import os
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from re import T
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from django.db.models import query
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from rest_framework import status, viewsets
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from rest_framework.generics import CreateAPIView, ListAPIView
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from rest_framework.views import APIView
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from rest_framework.response import Response
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from django.contrib.auth import authenticate, login, logout
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from django.contrib.auth.models import User
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from api.serializers import ListOrderSerializer, MakeOrderSerializer, UpdateOrderSerializer
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from api.models import LNPayment, MarketTick, Order, Currency
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from api.logics import Logics
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from api.messages import Telegram
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from api.utils import get_lnd_version, get_commit_robosats, compute_premium_percentile
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from .nick_generator.nick_generator import NickGenerator
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from robohash import Robohash
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from scipy.stats import entropy
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from math import log2
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import numpy as np
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import hashlib
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from pathlib import Path
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from datetime import timedelta, datetime
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from django.utils import timezone
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from django.conf import settings
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from decouple import config
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EXP_MAKER_BOND_INVOICE = int(config("EXP_MAKER_BOND_INVOICE"))
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RETRY_TIME = int(config("RETRY_TIME"))
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avatar_path = Path(settings.AVATAR_ROOT)
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avatar_path.mkdir(parents=True, exist_ok=True)
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# Create your views here.
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class MakerView(CreateAPIView):
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serializer_class = MakeOrderSerializer
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def post(self, request):
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serializer = self.serializer_class(data=request.data)
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if not request.user.is_authenticated:
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return Response(
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{
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"bad_request":
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"Woops! It seems you do not have a robot avatar"
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},
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status.HTTP_400_BAD_REQUEST,
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)
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if not serializer.is_valid():
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return Response(status=status.HTTP_400_BAD_REQUEST)
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# In case it gets overwhelming. Limit the number of public orders.
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if Order.objects.filter(status=Order.Status.PUB).count() >= int(config("MAX_PUBLIC_ORDERS")):
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return Response(
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{
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"bad_request":
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"Woah! RoboSats' book is at full capacity! Try again later"
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},
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status.HTTP_400_BAD_REQUEST,
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)
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type = serializer.data.get("type")
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currency = serializer.data.get("currency")
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amount = serializer.data.get("amount")
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payment_method = serializer.data.get("payment_method")
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premium = serializer.data.get("premium")
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satoshis = serializer.data.get("satoshis")
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is_explicit = serializer.data.get("is_explicit")
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valid, context, _ = Logics.validate_already_maker_or_taker(
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request.user)
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if not valid:
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return Response(context, status.HTTP_409_CONFLICT)
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# Creates a new order
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order = Order(
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type=type,
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currency=Currency.objects.get(id=currency),
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amount=amount,
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payment_method=payment_method,
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premium=premium,
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satoshis=satoshis,
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is_explicit=is_explicit,
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expires_at=timezone.now() + timedelta(
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seconds=EXP_MAKER_BOND_INVOICE), # TODO Move to class method
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maker=request.user,
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)
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# TODO move to Order class method when new instance is created!
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order.last_satoshis = order.t0_satoshis = Logics.satoshis_now(order)
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valid, context = Logics.validate_order_size(order)
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if not valid:
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return Response(context, status.HTTP_400_BAD_REQUEST)
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order.save()
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return Response(ListOrderSerializer(order).data,
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status=status.HTTP_201_CREATED)
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class OrderView(viewsets.ViewSet):
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serializer_class = UpdateOrderSerializer
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lookup_url_kwarg = "order_id"
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def get(self, request, format=None):
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"""
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Full trade pipeline takes place while looking/refreshing the order page.
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"""
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order_id = request.GET.get(self.lookup_url_kwarg)
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if not request.user.is_authenticated:
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return Response(
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{
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"bad_request":
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"You must have a robot avatar to see the order details"
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},
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status=status.HTTP_400_BAD_REQUEST,
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)
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if order_id == None:
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return Response(
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{"bad_request": "Order ID parameter not found in request"},
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status=status.HTTP_400_BAD_REQUEST,
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)
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order = Order.objects.filter(id=order_id)
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# check if exactly one order is found in the db
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if len(order) != 1:
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return Response({"bad_request": "Invalid Order Id"},
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status.HTTP_404_NOT_FOUND)
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# This is our order.
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order = order[0]
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# 2) If order has been cancelled
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if order.status == Order.Status.UCA:
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return Response(
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{"bad_request": "This order has been cancelled by the maker"},
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status.HTTP_400_BAD_REQUEST,
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)
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if order.status == Order.Status.CCA:
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return Response(
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{
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"bad_request":
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"This order has been cancelled collaborativelly"
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},
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status.HTTP_400_BAD_REQUEST,
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)
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data = ListOrderSerializer(order).data
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data["total_secs_exp"] = Order.t_to_expire[order.status]
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# if user is under a limit (penalty), inform him.
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is_penalized, time_out = Logics.is_penalized(request.user)
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if is_penalized:
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data["penalty"] = request.user.profile.penalty_expiration
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# Add booleans if user is maker, taker, partipant, buyer or seller
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data["is_maker"] = order.maker == request.user
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data["is_taker"] = order.taker == request.user
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data["is_participant"] = data["is_maker"] or data["is_taker"]
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# 3.a) If not a participant and order is not public, forbid.
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if not data["is_participant"] and order.status != Order.Status.PUB:
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return Response(
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{"bad_request": "You are not allowed to see this order"},
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status.HTTP_403_FORBIDDEN,
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)
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# WRITE Update last_seen for maker and taker.
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# Note down that the taker/maker was here recently, so counterpart knows if the user is paying attention.
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if order.maker == request.user:
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order.maker_last_seen = timezone.now()
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order.save()
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if order.taker == request.user:
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order.taker_last_seen = timezone.now()
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order.save()
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# Add activity status of participants based on last_seen
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if order.taker_last_seen != None:
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data["taker_status"] = Logics.user_activity_status(
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order.taker_last_seen)
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if order.maker_last_seen != None:
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data["maker_status"] = Logics.user_activity_status(
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order.maker_last_seen)
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# 3.b If order is between public and WF2
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if order.status >= Order.Status.PUB and order.status < Order.Status.WF2:
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data["price_now"], data["premium_now"] = Logics.price_and_premium_now(order)
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# 3. c) If maker and Public, add num robots in book, premium percentile
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# num similar orders, and maker information to enable telegram notifications.
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if data["is_maker"] and order.status == Order.Status.PUB:
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data["premium_percentile"] = compute_premium_percentile(order)
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data["num_similar_orders"] = len(
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Order.objects.filter(currency=order.currency,
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status=Order.Status.PUB))
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# Adds/generate telegram token and whether it is enabled
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data = {**data,**Telegram.get_context(request.user)}
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# 4) Non participants can view details (but only if PUB)
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elif not data["is_participant"] and order.status != Order.Status.PUB:
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return Response(data, status=status.HTTP_200_OK)
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# For participants add positions, nicks and status as a message and hold invoices status
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data["is_buyer"] = Logics.is_buyer(order, request.user)
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data["is_seller"] = Logics.is_seller(order, request.user)
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data["maker_nick"] = str(order.maker)
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data["taker_nick"] = str(order.taker)
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data["status_message"] = Order.Status(order.status).label
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data["is_fiat_sent"] = order.is_fiat_sent
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data["is_disputed"] = order.is_disputed
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data["ur_nick"] = request.user.username
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# Add whether hold invoices are LOCKED (ACCEPTED)
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# Is there a maker bond? If so, True if locked, False otherwise
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if order.maker_bond:
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data[
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"maker_locked"] = order.maker_bond.status == LNPayment.Status.LOCKED
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else:
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data["maker_locked"] = False
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# Is there a taker bond? If so, True if locked, False otherwise
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if order.taker_bond:
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data[
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"taker_locked"] = order.taker_bond.status == LNPayment.Status.LOCKED
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else:
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data["taker_locked"] = False
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# Is there an escrow? If so, True if locked, False otherwise
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if order.trade_escrow:
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data[
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"escrow_locked"] = order.trade_escrow.status == LNPayment.Status.LOCKED
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else:
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data["escrow_locked"] = False
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# If both bonds are locked, participants can see the final trade amount in sats.
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if order.taker_bond:
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if (order.maker_bond.status == order.taker_bond.status ==
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LNPayment.Status.LOCKED):
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# Seller sees the amount he sends
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if data["is_seller"]:
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data["trade_satoshis"] = Logics.escrow_amount(
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order, request.user)[1]["escrow_amount"]
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# Buyer sees the amount he receives
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elif data["is_buyer"]:
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data["trade_satoshis"] = Logics.payout_amount(
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order, request.user)[1]["invoice_amount"]
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# 5) If status is 'waiting for maker bond' and user is MAKER, reply with a MAKER hold invoice.
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if order.status == Order.Status.WFB and data["is_maker"]:
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valid, context = Logics.gen_maker_hold_invoice(order, request.user)
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if valid:
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data = {**data, **context}
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else:
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return Response(context, status.HTTP_400_BAD_REQUEST)
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# 6) If status is 'waiting for taker bond' and user is TAKER, reply with a TAKER hold invoice.
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elif order.status == Order.Status.TAK and data["is_taker"]:
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valid, context = Logics.gen_taker_hold_invoice(order, request.user)
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if valid:
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data = {**data, **context}
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else:
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return Response(context, status.HTTP_400_BAD_REQUEST)
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# 7 a. ) If seller and status is 'WF2' or 'WFE'
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elif data["is_seller"] and (order.status == Order.Status.WF2
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or order.status == Order.Status.WFE):
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# If the two bonds are locked, reply with an ESCROW hold invoice.
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if (order.maker_bond.status == order.taker_bond.status ==
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LNPayment.Status.LOCKED):
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valid, context = Logics.gen_escrow_hold_invoice(
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order, request.user)
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if valid:
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data = {**data, **context}
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else:
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return Response(context, status.HTTP_400_BAD_REQUEST)
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# 7.b) If user is Buyer and status is 'WF2' or 'WFI'
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elif data["is_buyer"] and (order.status == Order.Status.WF2
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or order.status == Order.Status.WFI):
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# If the two bonds are locked, reply with an AMOUNT so he can send the buyer invoice.
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if (order.maker_bond.status == order.taker_bond.status ==
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LNPayment.Status.LOCKED):
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valid, context = Logics.payout_amount(order, request.user)
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if valid:
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data = {**data, **context}
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else:
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return Response(context, status.HTTP_400_BAD_REQUEST)
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# 8) If status is 'CHA' or 'FSE' and all HTLCS are in LOCKED
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elif order.status in [
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Order.Status.WFI, Order.Status.CHA, Order.Status.FSE
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]:
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# If all bonds are locked.
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if (order.maker_bond.status == order.taker_bond.status ==
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order.trade_escrow.status == LNPayment.Status.LOCKED):
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# add whether a collaborative cancel is pending or has been asked
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if (data["is_maker"] and order.taker_asked_cancel) or (
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data["is_taker"] and order.maker_asked_cancel):
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data["pending_cancel"] = True
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elif (data["is_maker"] and order.maker_asked_cancel) or (
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data["is_taker"] and order.taker_asked_cancel):
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data["asked_for_cancel"] = True
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else:
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data["asked_for_cancel"] = False
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# 9) If status is 'DIS' and all HTLCS are in LOCKED
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elif order.status == Order.Status.DIS:
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# add whether the dispute statement has been received
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if data["is_maker"]:
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data["statement_submitted"] = (order.maker_statement != None
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and order.maker_statement != "")
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elif data["is_taker"]:
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data["statement_submitted"] = (order.taker_statement != None
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and order.taker_statement != "")
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# 9) If status is 'Failed routing', reply with retry amounts, time of next retry and ask for invoice at third.
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elif (order.status == Order.Status.FAI
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and order.payout.receiver == request.user
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): # might not be the buyer if after a dispute where winner wins
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data["retries"] = order.payout.routing_attempts
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data[
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"next_retry_time"] = order.payout.last_routing_time + timedelta(
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minutes=RETRY_TIME)
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if order.payout.status == LNPayment.Status.EXPIRE:
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data["invoice_expired"] = True
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# Add invoice amount once again if invoice was expired.
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data["invoice_amount"] = Logics.payout_amount(order,request.user)[1]["invoice_amount"]
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return Response(data, status.HTTP_200_OK)
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def take_update_confirm_dispute_cancel(self, request, format=None):
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"""
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Here takes place all of the updates to the order object.
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That is: take, confim, cancel, dispute, update_invoice or rate.
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"""
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order_id = request.GET.get(self.lookup_url_kwarg)
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serializer = UpdateOrderSerializer(data=request.data)
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if not serializer.is_valid():
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return Response(status=status.HTTP_400_BAD_REQUEST)
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order = Order.objects.get(id=order_id)
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# action is either 1)'take', 2)'confirm', 3)'cancel', 4)'dispute' , 5)'update_invoice'
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# 6)'submit_statement' (in dispute), 7)'rate_user' , 'rate_platform'
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action = serializer.data.get("action")
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invoice = serializer.data.get("invoice")
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statement = serializer.data.get("statement")
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rating = serializer.data.get("rating")
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# 1) If action is take, it is a taker request!
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if action == "take":
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if order.status == Order.Status.PUB:
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valid, context, _ = Logics.validate_already_maker_or_taker(
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request.user)
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if not valid:
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return Response(context, status=status.HTTP_409_CONFLICT)
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valid, context = Logics.take(order, request.user)
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if not valid:
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return Response(context, status=status.HTTP_403_FORBIDDEN)
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return self.get(request)
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else:
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Response(
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{"bad_request": "This order is not public anymore."},
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status.HTTP_400_BAD_REQUEST,
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)
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# Any other action is only allowed if the user is a participant
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if not (order.maker == request.user or order.taker == request.user):
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return Response(
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{"bad_request": "You are not a participant in this order"},
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status.HTTP_403_FORBIDDEN,
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)
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# 2) If action is 'update invoice'
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if action == "update_invoice" and invoice:
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valid, context = Logics.update_invoice(order, request.user,
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invoice)
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if not valid:
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return Response(context, status.HTTP_400_BAD_REQUEST)
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# 3) If action is cancel
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elif action == "cancel":
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valid, context = Logics.cancel_order(order, request.user)
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if not valid:
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return Response(context, status.HTTP_400_BAD_REQUEST)
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# 4) If action is confirm
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elif action == "confirm":
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valid, context = Logics.confirm_fiat(order, request.user)
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if not valid:
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return Response(context, status.HTTP_400_BAD_REQUEST)
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# 5) If action is dispute
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elif action == "dispute":
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valid, context = Logics.open_dispute(order, request.user)
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if not valid:
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return Response(context, status.HTTP_400_BAD_REQUEST)
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elif action == "submit_statement":
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valid, context = Logics.dispute_statement(order, request.user,
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statement)
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if not valid:
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return Response(context, status.HTTP_400_BAD_REQUEST)
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# 6) If action is rate
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elif action == "rate_user" and rating:
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valid, context = Logics.rate_counterparty(order, request.user,
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rating)
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if not valid:
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return Response(context, status.HTTP_400_BAD_REQUEST)
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# 6) If action is rate_platform
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elif action == "rate_platform" and rating:
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valid, context = Logics.rate_platform(request.user, rating)
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if not valid:
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return Response(context, status.HTTP_400_BAD_REQUEST)
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# If nothing of the above... something else is going on. Probably not allowed!
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else:
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return Response(
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{
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"bad_request":
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"The Robotic Satoshis working in the warehouse did not understand you. "
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+
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"Please, fill a Bug Issue in Github https://github.com/reckless-satoshi/robosats/issues"
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},
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status.HTTP_501_NOT_IMPLEMENTED,
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)
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return self.get(request)
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class UserView(APIView):
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lookup_url_kwarg = "token"
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NickGen = NickGenerator(lang="English",
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use_adv=False,
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use_adj=True,
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use_noun=True,
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max_num=999)
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# Probably should be turned into a post method
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def get(self, request, format=None):
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"""
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Get a new user derived from a high entropy token
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- Request has a high-entropy token,
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- Generates new nickname and avatar.
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- Creates login credentials (new User object)
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Response with Avatar and Nickname.
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"""
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# If an existing user opens the main page by mistake, we do not want it to create a new nickname/profile for him
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if request.user.is_authenticated:
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context = {"nickname": request.user.username}
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not_participant, _, _ = Logics.validate_already_maker_or_taker(
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request.user)
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# Does not allow this 'mistake' if an active order
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if not not_participant:
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context[
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"bad_request"] = f"You are already logged in as {request.user} and have an active order"
|
|
return Response(context, status.HTTP_400_BAD_REQUEST)
|
|
|
|
# Does not allow this 'mistake' if the last login was sometime ago (5 minutes)
|
|
# if request.user.last_login < timezone.now() - timedelta(minutes=5):
|
|
# context['bad_request'] = f'You are already logged in as {request.user}'
|
|
# return Response(context, status.HTTP_400_BAD_REQUEST)
|
|
|
|
token = request.GET.get(self.lookup_url_kwarg)
|
|
|
|
# Compute token entropy
|
|
value, counts = np.unique(list(token), return_counts=True)
|
|
shannon_entropy = entropy(counts, base=62)
|
|
bits_entropy = log2(len(value)**len(token))
|
|
# Payload
|
|
context = {
|
|
"token_shannon_entropy": shannon_entropy,
|
|
"token_bits_entropy": bits_entropy,
|
|
}
|
|
|
|
# Deny user gen if entropy below 128 bits or 0.7 shannon heterogeneity
|
|
if bits_entropy < 128 or shannon_entropy < 0.7:
|
|
context["bad_request"] = "The token does not have enough entropy"
|
|
return Response(context, status=status.HTTP_400_BAD_REQUEST)
|
|
|
|
# Hash the token, only 1 iteration.
|
|
hash = hashlib.sha256(str.encode(token)).hexdigest()
|
|
|
|
# Generate nickname deterministically
|
|
nickname = self.NickGen.short_from_SHA256(hash, max_length=18)[0]
|
|
context["nickname"] = nickname
|
|
|
|
# Generate avatar
|
|
rh = Robohash(hash)
|
|
rh.assemble(roboset="set1", bgset="any") # for backgrounds ON
|
|
|
|
# Does not replace image if existing (avoid re-avatar in case of nick collusion)
|
|
image_path = avatar_path.joinpath(nickname + ".png")
|
|
if not image_path.exists():
|
|
with open(image_path, "wb") as f:
|
|
rh.img.save(f, format="png")
|
|
|
|
# Create new credentials and login if nickname is new
|
|
if len(User.objects.filter(username=nickname)) == 0:
|
|
User.objects.create_user(username=nickname,
|
|
password=token,
|
|
is_staff=False)
|
|
user = authenticate(request, username=nickname, password=token)
|
|
user.profile.avatar = "static/assets/avatars/" + nickname + ".png"
|
|
login(request, user)
|
|
return Response(context, status=status.HTTP_201_CREATED)
|
|
|
|
else:
|
|
user = authenticate(request, username=nickname, password=token)
|
|
if user is not None:
|
|
login(request, user)
|
|
# Sends the welcome back message, only if created +3 mins ago
|
|
if request.user.date_joined < (timezone.now() -
|
|
timedelta(minutes=3)):
|
|
context["found"] = "We found your Robot avatar. Welcome back!"
|
|
return Response(context, status=status.HTTP_202_ACCEPTED)
|
|
else:
|
|
# It is unlikely, but maybe the nickname is taken (1 in 20 Billion change)
|
|
context["found"] = "Bad luck, this nickname is taken"
|
|
context["bad_request"] = "Enter a different token"
|
|
return Response(context, status.HTTP_403_FORBIDDEN)
|
|
|
|
def delete(self, request):
|
|
"""Pressing "give me another" deletes the logged in user"""
|
|
user = request.user
|
|
if not user.is_authenticated:
|
|
return Response(status.HTTP_403_FORBIDDEN)
|
|
|
|
# Only delete if user life is shorter than 30 minutes. Helps to avoid deleting users by mistake
|
|
if user.date_joined < (timezone.now() - timedelta(minutes=30)):
|
|
return Response(status.HTTP_400_BAD_REQUEST)
|
|
|
|
# Check if it is not a maker or taker!
|
|
not_participant, _, _ = Logics.validate_already_maker_or_taker(user)
|
|
if not not_participant:
|
|
return Response(
|
|
{
|
|
"bad_request":
|
|
"Maybe a mistake? User cannot be deleted while he is part of an order"
|
|
},
|
|
status.HTTP_400_BAD_REQUEST,
|
|
)
|
|
# Check if has already a profile with
|
|
if user.profile.total_contracts > 0:
|
|
return Response(
|
|
{
|
|
"bad_request":
|
|
"Maybe a mistake? User cannot be deleted as it has completed trades"
|
|
},
|
|
status.HTTP_400_BAD_REQUEST,
|
|
)
|
|
|
|
logout(request)
|
|
user.delete()
|
|
return Response(
|
|
{"user_deleted": "User deleted permanently"},
|
|
status.HTTP_301_MOVED_PERMANENTLY,
|
|
)
|
|
|
|
|
|
class BookView(ListAPIView):
|
|
serializer_class = ListOrderSerializer
|
|
queryset = Order.objects.filter(status=Order.Status.PUB)
|
|
|
|
def get(self, request, format=None):
|
|
currency = request.GET.get("currency")
|
|
type = request.GET.get("type")
|
|
|
|
queryset = Order.objects.filter(status=Order.Status.PUB)
|
|
|
|
# Currency 0 and type 2 are special cases treated as "ANY". (These are not really possible choices)
|
|
if int(currency) == 0 and int(type) != 2:
|
|
queryset = Order.objects.filter(type=type, status=Order.Status.PUB)
|
|
elif int(type) == 2 and int(currency) != 0:
|
|
queryset = Order.objects.filter(currency=currency,
|
|
status=Order.Status.PUB)
|
|
elif not (int(currency) == 0 and int(type) == 2):
|
|
queryset = Order.objects.filter(currency=currency,
|
|
type=type,
|
|
status=Order.Status.PUB)
|
|
|
|
if len(queryset) == 0:
|
|
return Response(
|
|
{"not_found": "No orders found, be the first to make one"},
|
|
status=status.HTTP_404_NOT_FOUND,
|
|
)
|
|
|
|
book_data = []
|
|
for order in queryset:
|
|
data = ListOrderSerializer(order).data
|
|
data["maker_nick"] = str(order.maker)
|
|
|
|
# Compute current premium for those orders that are explicitly priced.
|
|
data["price"], data["premium"] = Logics.price_and_premium_now(
|
|
order)
|
|
data["maker_status"] = Logics.user_activity_status(
|
|
order.maker_last_seen)
|
|
for key in (
|
|
"status",
|
|
"taker",
|
|
): # Non participants should not see the status or who is the taker
|
|
del data[key]
|
|
|
|
book_data.append(data)
|
|
|
|
return Response(book_data, status=status.HTTP_200_OK)
|
|
|
|
class InfoView(ListAPIView):
|
|
|
|
def get(self, request):
|
|
context = {}
|
|
|
|
context["num_public_buy_orders"] = len(
|
|
Order.objects.filter(type=Order.Types.BUY,
|
|
status=Order.Status.PUB))
|
|
context["num_public_sell_orders"] = len(
|
|
Order.objects.filter(type=Order.Types.SELL,
|
|
status=Order.Status.PUB))
|
|
|
|
# Number of active users (logged in in last 30 minutes)
|
|
today = datetime.today()
|
|
context["active_robots_today"] = len(
|
|
User.objects.filter(last_login__day=today.day))
|
|
|
|
# Compute average premium and volume of today
|
|
queryset = MarketTick.objects.filter(timestamp__day=today.day)
|
|
if not len(queryset) == 0:
|
|
weighted_premiums = []
|
|
volumes = []
|
|
for tick in queryset:
|
|
weighted_premiums.append(tick.premium * tick.volume)
|
|
volumes.append(tick.volume)
|
|
|
|
total_volume = sum(volumes)
|
|
# Avg_premium is the weighted average of the premiums by volume
|
|
avg_premium = sum(weighted_premiums) / total_volume
|
|
else:
|
|
avg_premium = 0
|
|
total_volume = 0
|
|
|
|
queryset = MarketTick.objects.all()
|
|
if not len(queryset) == 0:
|
|
volume_contracted = []
|
|
for tick in queryset:
|
|
volume_contracted.append(tick.volume)
|
|
lifetime_volume = sum(volume_contracted)
|
|
else:
|
|
lifetime_volume = 0
|
|
|
|
context["today_avg_nonkyc_btc_premium"] = round(avg_premium, 2)
|
|
context["today_volume"] = total_volume *100000000
|
|
context["lifetime_volume"] = lifetime_volume
|
|
context["lnd_version"] = get_lnd_version()
|
|
context["robosats_running_commit_hash"] = get_commit_robosats()
|
|
context["alternative_site"] = config("ALTERNATIVE_SITE")
|
|
context["alternative_name"] = config("ALTERNATIVE_NAME")
|
|
context["node_alias"] = config("NODE_ALIAS")
|
|
context["node_id"] = config("NODE_ID")
|
|
context["network"] = config("NETWORK")
|
|
context["maker_fee"] = float(config("FEE"))*float(config("MAKER_FEE_SPLIT"))
|
|
context["taker_fee"] = float(config("FEE"))*(1 - float(config("MAKER_FEE_SPLIT")))
|
|
context["bond_size"] = float(config("BOND_SIZE"))
|
|
if request.user.is_authenticated:
|
|
context["nickname"] = request.user.username
|
|
has_no_active_order, _, order = Logics.validate_already_maker_or_taker(
|
|
request.user)
|
|
if not has_no_active_order:
|
|
context["active_order_id"] = order.id
|
|
|
|
return Response(context, status.HTTP_200_OK)
|