from rest_framework import status, viewsets from rest_framework.generics import CreateAPIView, ListAPIView from rest_framework.views import APIView from rest_framework.response import Response from django.contrib.auth import authenticate, login, logout from django.contrib.auth.models import User from .serializers import ListOrderSerializer, MakeOrderSerializer, UpdateOrderSerializer from .models import Order from .logics import Logics from .nick_generator.nick_generator import NickGenerator from robohash import Robohash from scipy.stats import entropy from math import log2 import numpy as np import hashlib from pathlib import Path from datetime import timedelta from django.utils import timezone from decouple import config EXP_MAKER_BOND_INVOICE = int(config('EXP_MAKER_BOND_INVOICE')) avatar_path = Path('frontend/static/assets/avatars') avatar_path.mkdir(parents=True, exist_ok=True) # Create your views here. class OrderMakerView(CreateAPIView): serializer_class = MakeOrderSerializer def post(self,request): serializer = self.serializer_class(data=request.data) if not serializer.is_valid(): return Response(status=status.HTTP_400_BAD_REQUEST) type = serializer.data.get('type') currency = serializer.data.get('currency') amount = serializer.data.get('amount') payment_method = serializer.data.get('payment_method') premium = serializer.data.get('premium') satoshis = serializer.data.get('satoshis') is_explicit = serializer.data.get('is_explicit') valid, context = Logics.validate_already_maker_or_taker(request.user) if not valid: return Response(context, status.HTTP_409_CONFLICT) # Creates a new order order = Order( type=type, currency=currency, amount=amount, payment_method=payment_method, premium=premium, satoshis=satoshis, is_explicit=is_explicit, expires_at=timezone.now()+timedelta(minutes=EXP_MAKER_BOND_INVOICE), # TODO Move to class method maker=request.user) # TODO move to Order class method when new instance is created! order.last_satoshis = order.t0_satoshis = Logics.satoshis_now(order) valid, context = Logics.validate_order_size(order) if not valid: return Response(context, status.HTTP_400_BAD_REQUEST) order.save() return Response(ListOrderSerializer(order).data, status=status.HTTP_201_CREATED) class OrderView(viewsets.ViewSet): serializer_class = UpdateOrderSerializer lookup_url_kwarg = 'order_id' def get(self, request, format=None): order_id = request.GET.get(self.lookup_url_kwarg) if order_id == None: return Response({'Bad Request':'Order ID parameter not found in request'}, status=status.HTTP_400_BAD_REQUEST) order = Order.objects.filter(id=order_id) # check if exactly one order is found in the db if len(order) == 1 : order = order[0] # 1) If order expired if order.status == Order.Status.EXP: return Response({'bad_request':'This order has expired'},status.HTTP_400_BAD_REQUEST) data = ListOrderSerializer(order).data # Add booleans if user is maker, taker, partipant, buyer or seller data['is_maker'] = order.maker == request.user data['is_taker'] = order.taker == request.user data['is_participant'] = data['is_maker'] or data['is_taker'] # 2) If not a participant and order is not public, forbid. if not data['is_participant'] and order.status != Order.Status.PUB: return Response({'bad_request':'Not allowed to see this order'},status.HTTP_403_FORBIDDEN) # 3) Non participants can view details (but only if PUB) elif not data['is_participant'] and order.status != Order.Status.PUB: return Response(data, status=status.HTTP_200_OK) # For participants add position side, nicks and status as message data['is_buyer'] = Logics.is_buyer(order,request.user) data['is_seller'] = Logics.is_seller(order,request.user) data['maker_nick'] = str(order.maker) data['taker_nick'] = str(order.taker) data['status_message'] = Order.Status(order.status).label # 4) If status is 'waiting for maker bond', reply with a MAKER HODL invoice. if order.status == Order.Status.WFB and data['is_maker']: valid, context = Logics.gen_maker_hodl_invoice(order, request.user) if valid: data = {**data, **context} else: return Response(context, status.HTTP_400_BAD_REQUEST) # 5) If status is 'Taken' and user is taker/buyer, reply with a TAKER HODL invoice. elif order.status == Order.Status.TAK and data['is_taker'] and data['is_buyer']: valid, context = Logics.gen_takerbuyer_hodl_invoice(order, request.user) if valid: data = {**data, **context} else: return Response(context, status.HTTP_400_BAD_REQUEST) # 6) If status is 'Public' and user is taker/seller, reply with a ESCROW HODL invoice. elif order.status == Order.Status.PUB and data['is_taker'] and data['is_seller']: valid, context = Logics.gen_seller_hodl_invoice(order, request.user) if valid: data = {**data, **context} else: return Response(context, status.HTTP_400_BAD_REQUEST) # 7) If status is 'WF2/WTC' and user is maker/seller, reply with an ESCROW HODL invoice. elif (order.status == Order.Status.WF2 or order.status == Order.Status.WF2) and data['is_maker'] and data['is_seller']: valid, context = Logics.gen_seller_hodl_invoice(order, request.user) if valid: data = {**data, **context} else: return Response(context, status.HTTP_400_BAD_REQUEST) return Response(data, status.HTTP_200_OK) return Response({'Order Not Found':'Invalid Order Id'}, status.HTTP_404_NOT_FOUND) def take_update_confirm_dispute_cancel(self, request, format=None): order_id = request.GET.get(self.lookup_url_kwarg) serializer = UpdateOrderSerializer(data=request.data) if not serializer.is_valid(): return Response(status=status.HTTP_400_BAD_REQUEST) order = Order.objects.get(id=order_id) # action is either 1)'take', 2)'confirm', 3)'cancel', 4)'dispute' , 5)'update_invoice' 6)'rate' (counterparty) action = serializer.data.get('action') invoice = serializer.data.get('invoice') rating = serializer.data.get('rating') # 1) If action is take, it is be taker request! if action == 'take': if order.status == Order.Status.PUB: valid, context = Logics.validate_already_maker_or_taker(request.user) if not valid: return Response(context, status=status.HTTP_409_CONFLICT) Logics.take(order, request.user) else: Response({'bad_request':'This order is not public anymore.'}, status.HTTP_400_BAD_REQUEST) # 2) If action is update (invoice) elif action == 'update' and invoice: updated, context = Logics.update_invoice(order,request.user,invoice) if not updated: return Response(context,status.HTTP_400_BAD_REQUEST) # 3) If action is cancel elif action == 'cancel': pass # 4) If action is confirm elif action == 'confirm': pass # 5) If action is dispute elif action == 'dispute': pass # 6) If action is dispute elif action == 'rate' and rating: pass # If nothing... something else is going on. Probably not allowed! else: return Response({'bad_request':'Not allowed'}) return self.get(request) class UserView(APIView): lookup_url_kwarg = 'token' NickGen = NickGenerator( lang='English', use_adv=False, use_adj=True, use_noun=True, max_num=999) # Probably should be turned into a post method def get(self,request, format=None): ''' Get a new user derived from a high entropy token - Request has a high-entropy token, - Generates new nickname and avatar. - Creates login credentials (new User object) Response with Avatar and Nickname. ''' 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) # Hashes the token, only 1 iteration. Maybe more is better. hash = hashlib.sha256(str.encode(token)).hexdigest() # Generate nickname 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 log in 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 = str(image_path)[9:] # removes frontend/ from url (ugly, to be fixed) 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 +30 mins ago if request.user.date_joined < (timezone.now()-timedelta(minutes=30)): context['found'] = 'We found your Robosat. 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=status.HTTP_403_FORBIDDEN) def delete(self,request): user = User.objects.get(id = request.user.id) # TO DO. Pressing "give me another" deletes the logged in user # However it might be a long time recovered user # Only delete if user live is < 5 minutes # TODO check if user exists AND it is not a maker or taker! if user is not None: logout(request) user.delete() return Response({'user_deleted':'User deleted permanently'},status=status.HTTP_302_FOUND) return Response(status=status.HTTP_403_FORBIDDEN) class BookView(ListAPIView): serializer_class = ListOrderSerializer def get(self,request, format=None): currency = request.GET.get('currency') type = request.GET.get('type') queryset = Order.objects.filter(currency=currency, type=type, status=int(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) queryset = queryset.order_by('created_at') book_data = [] for order in queryset: data = ListOrderSerializer(order).data user = User.objects.filter(id=data['maker']) if len(user) == 1: data['maker_nick'] = user[0].username # Non participants should not see the status or who is the taker for key in ('status','taker'): del data[key] book_data.append(data) return Response(book_data, status=status.HTTP_200_OK)