merge with branch logics-second-iteration

.env-sample

@@ -0,0 +1,17 @@
+# Market price public API
+MARKET_PRICE_API = 'https://blockchain.info/ticker'
+
+# Trade fee in percentage %
+FEE = 0.002
+# Bond size in percentage %     
+BOND_SIZE = 0.01
+
+# Trade limits in satoshis
+MIN_TRADE = 10000 
+MAX_TRADE = 500000
+
+# Expiration time in minutes
+EXPIRATION_MAKE = 5 
+
+# Username for HTLCs escrows
+ESCROW_USERNAME = 'admin'

api/admin.py

@@ -2,7 +2,7 @@ from django.contrib import admin
 from django_admin_relation_links import AdminChangeLinksMixin
 from django.contrib.auth.models import Group, User
 from django.contrib.auth.admin import UserAdmin
-from .models import Order, LNPayment, Profile
+from .models import Order, LNPayment, Profile, MarketTick
 
 admin.site.unregister(Group)
 admin.site.unregister(User)
@@ -17,22 +17,24 @@ class ProfileInline(admin.StackedInline):
 @admin.register(User)
 class EUserAdmin(UserAdmin):
     inlines = [ProfileInline]
-    list_display = ('avatar_tag',) + UserAdmin.list_display
+    list_display = ('avatar_tag','id','username','last_login','date_joined','is_staff')
-    list_display_links = ['username']
+    list_display_links = ('id','username')
     def avatar_tag(self, obj):
         return obj.profile.avatar_tag()
 
 @admin.register(Order)
 class OrderAdmin(AdminChangeLinksMixin, admin.ModelAdmin):
-    list_display = ('id','type','maker_link','taker_link','status','amount','currency','t0_satoshis','created_at','expires_at', 'buyer_invoice_link','maker_bond_link','taker_bond_link','trade_escrow_link')
+    list_display = ('id','type','maker_link','taker_link','status','amount','currency','t0_satoshis','is_disputed','is_fiat_sent','created_at','expires_at', 'buyer_invoice_link','maker_bond_link','taker_bond_link','trade_escrow_link')
     list_display_links = ('id','type')
     change_links = ('maker','taker','buyer_invoice','maker_bond','taker_invoice','taker_bond','trade_escrow')
+    list_filter = ('is_disputed','is_fiat_sent','type','currency','status')
 
 @admin.register(LNPayment)
 class LNPaymentAdmin(AdminChangeLinksMixin, admin.ModelAdmin):
     list_display = ('id','concept','status','num_satoshis','type','invoice','expires_at','sender_link','receiver_link')
     list_display_links = ('id','concept')
     change_links = ('sender','receiver')
+    list_filter = ('type','concept','status')
 
 @admin.register(Profile)
 class UserProfileAdmin(AdminChangeLinksMixin, admin.ModelAdmin):
@@ -40,3 +42,9 @@ class UserProfileAdmin(AdminChangeLinksMixin, admin.ModelAdmin):
     list_display_links = ('avatar_tag','id')
     change_links =['user']
     readonly_fields = ['avatar_tag']
+
+@admin.register(MarketTick)
+class MarketTickAdmin(admin.ModelAdmin):
+    list_display = ('timestamp','price','volume','premium','currency','fee')
+    readonly_fields = ('timestamp','price','volume','premium','currency','fee')
+    list_filter = ['currency']

api/lightning.py

@@ -22,32 +22,36 @@ class LNNode():
 
         return invoice, payment_hash, expires_at 
 
-    def validate_hodl_invoice_locked():
+    def validate_hodl_invoice_locked(payment_hash):
         '''Generates hodl invoice to publish an order'''
         return True
 
-    def validate_ln_invoice(invoice): # num_satoshis
+    def validate_ln_invoice(invoice, num_satoshis): # num_satoshis
         '''Checks if the submited LN invoice is as expected'''
         valid = True
-        num_satoshis = 50000 # TODO decrypt and confirm sats are as expected
+        context = None
         description = 'Placeholder desc' # TODO decrypt from LN invoice
-        payment_hash = '567126' # TODO decrypt
+        payment_hash = '567&*GIHU126' # TODO decrypt
         expires_at = timezone.now() # TODO decrypt
 
-        return valid, num_satoshis, description, payment_hash, expires_at
+        return valid, context, description, payment_hash, expires_at
 
-    def pay_buyer_invoice(invoice):
+    def pay_invoice(invoice):
-        '''Sends sats to buyer'''
+        '''Sends sats to buyer, or cancelinvoices'''
         return True
 
-    def charge_hodl_htlcs(invoice):
+    def settle_hodl_htlcs(payment_hash):
         '''Charges a LN hodl invoice'''
         return True
 
-    def free_hodl_htlcs(invoice):
+    def return_hodl_htlcs(payment_hash):
         '''Returns sats'''
         return True
 
+    def double_check_htlc_is_settled(payment_hash):
+        ''' Just as it sounds. Better safe than sorry!'''
+        return True
+
     
     
 

api/logics.py

@@ -1,10 +1,10 @@
 from datetime import timedelta
 from django.utils import timezone
-import requests
 from .lightning import LNNode
 
-from .models import Order, LNPayment, User
+from .models import Order, LNPayment, MarketTick, User
 from decouple import config
+from .utils import get_exchange_rate
 
 FEE = float(config('FEE'))
 BOND_SIZE = float(config('BOND_SIZE'))
@@ -23,8 +23,6 @@ ESCROW_EXPIRY = int(config('ESCROW_EXPIRY'))
 
 class Logics():
 
-    # escrow_user = User.objects.get(username=ESCROW_USERNAME)
-
     def validate_already_maker_or_taker(user):
         '''Checks if the user is already partipant of an order'''
         queryset = Order.objects.filter(maker=user)
@@ -63,11 +61,9 @@ class Logics():
         if order.is_explicit:
             satoshis_now = order.satoshis
         else:
-            # TODO Add fallback Public APIs and error handling
+            exchange_rate = get_exchange_rate(Order.currency_dict[str(order.currency)])
-            # Think about polling price data in a different way (e.g. store locally every t seconds)
+            premium_rate = exchange_rate * (1+float(order.premium)/100)
-            market_prices = requests.get(MARKET_PRICE_API).json()
+            satoshis_now = (float(order.amount) / premium_rate) * 100*1000*1000
-            exchange_rate = float(market_prices[Order.currency_dict[str(order.currency)]]['last'])
-            satoshis_now = ((float(order.amount) * 1+float(order.premium)) / exchange_rate) * 100*1000*1000
 
         return int(satoshis_now)
     
@@ -89,10 +85,19 @@ class Logics():
 
     @classmethod
     def update_invoice(cls, order, user, invoice):
-        is_valid_invoice, num_satoshis, description, payment_hash, expires_at = LNNode.validate_ln_invoice(invoice)
+        
-        # only user is the buyer and a valid LN invoice
+        # only the buyer can post a buyer invoice
-        if not (cls.is_buyer(order, user) or is_valid_invoice):
+        if not cls.is_buyer(order, user):
-            return False, {'bad_request':'Invalid Lightning Network Invoice. It starts by LNTB...'}
+            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):
+            return False, {'bad_request':'You cannot a invoice while bonds are not posted.'}
+
+        num_satoshis = cls.buyer_invoice_amount(order, user)[1]['invoice_amount']
+        valid, context, description, payment_hash, expires_at = LNNode.validate_ln_invoice(invoice, num_satoshis)
+        if not valid:
+            return False, context
 
         order.buyer_invoice, _ = LNPayment.objects.update_or_create(
             concept = LNPayment.Concepts.PAYBUYER, 
@@ -130,22 +135,29 @@ class Logics():
 
     @classmethod
     def rate_counterparty(cls, order, user, rating):
-        # if maker, rates taker
+
-        if order.maker == user:
+        # If the trade is finished
-            order.taker.profile.total_ratings = order.taker.profile.total_ratings + 1
+        if order.status > Order.Status.PAY:
-            last_ratings = list(order.taker.profile.last_ratings).append(rating)
+
-            order.taker.profile.total_ratings = sum(last_ratings) / len(last_ratings)
+            # if maker, rates taker
-        # if taker, rates maker
+            if order.maker == user:
-        if order.taker == user:
+                order.taker.profile.total_ratings = order.taker.profile.total_ratings + 1
-            order.maker.profile.total_ratings = order.maker.profile.total_ratings + 1
+                last_ratings = list(order.taker.profile.last_ratings).append(rating)
-            last_ratings = list(order.maker.profile.last_ratings).append(rating)
+                order.taker.profile.total_ratings = sum(last_ratings) / len(last_ratings)
-            order.maker.profile.total_ratings = sum(last_ratings) / len(last_ratings)
+
+            # if taker, rates maker
+            if order.taker == user:
+                order.maker.profile.total_ratings = order.maker.profile.total_ratings + 1
+                last_ratings = list(order.maker.profile.last_ratings).append(rating)
+                order.maker.profile.total_ratings = sum(last_ratings) / len(last_ratings)
+        else:
+            return False, {'bad_request':'You cannot rate your counterparty yet.'}
 
         order.save()
         return True, None
 
     @classmethod
-    def cancel_order(cls, order, user, state):
+    def cancel_order(cls, order, user, state=None):
 
         # 1) When maker cancels before bond
         '''The order never shows up on the book and order 
@@ -292,3 +304,54 @@ class Logics():
 
         order.save()
         return True, {'escrow_invoice':invoice,'escrow_satoshis': escrow_satoshis}
+    
+    def settle_escrow(order):
+        ''' Settles the trade escrow HTLC'''
+        # TODO ERROR HANDLING
+
+        valid = LNNode.settle_hodl_htlcs(order.trade_escrow.payment_hash)
+        return valid
+
+    def pay_buyer_invoice(order):
+        ''' Settles the trade escrow HTLC'''
+        # TODO ERROR HANDLING
+
+        valid = LNNode.pay_invoice(order.buyer_invoice.payment_hash)
+        return valid
+
+    @classmethod
+    def confirm_fiat(cls, order, user):
+        ''' If Order is in the CHAT states:
+        If user is buyer: mark FIAT SENT and settle escrow!
+        If User is the seller and FIAT is SENT: 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):
+                if cls.settle_escrow(order):          # KEY LINE - SETTLES THE TRADE ESCROW !!
+                    order.trade_escrow.status = LNPayment.Status.SETLED
+                    order.status = Order.Status.FSE
+                    order.is_fiat_sent = True
+
+            # If seller and fiat sent, 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.'}
+                
+                # Double check the escrow is settled.
+                if LNNode.double_check_htlc_is_settled(order.trade_escrow.payment_hash): 
+
+                    # Make sure the trade escrow is at least as big as the buyer invoice 
+                    if order.trade_escrow.num_satoshis <= order.buyer_invoice.num_satoshis:
+                        return False, {'bad_request':'Woah, something broke badly. Report in the public channels, or open a Github Issue.'}
+                    
+                    # Double check the trade escrow is settled
+                    elif cls.pay_buyer_invoice(order):   # KEY LINE - PAYS THE BUYER !!
+                        order.status = Order.Status.PAY
+                        order.buyer_invoice.status = LNPayment.Status.PAYING
+        else:
+            return False, {'bad_request':'You cannot confirm the fiat payment at this stage'}
+
+        order.save()
+        return True, None

api/models.py

@@ -7,19 +7,14 @@ from django.utils.html import mark_safe
 
 from decouple import config
 from pathlib import Path
+from .utils import get_exchange_rate
 import json
 
-#############################
-# TODO
-# Load hparams from .env file
-
 MIN_TRADE = int(config('MIN_TRADE'))
 MAX_TRADE = int(config('MAX_TRADE'))
 FEE = float(config('FEE'))
 BOND_SIZE = float(config('BOND_SIZE'))
 
-
-
 class LNPayment(models.Model):
 
     class Types(models.IntegerChoices):
@@ -39,7 +34,8 @@ class LNPayment(models.Model):
         RETNED = 3, 'Returned'
         MISSNG = 4, 'Missing'
         VALIDI = 5, 'Valid'
-        INFAIL = 6, 'Failed routing'
+        PAYING = 6, 'Paying ongoing'
+        FAILRO = 7, 'Failed routing'
 
     # payment use details
     type = models.PositiveSmallIntegerField(choices=Types.choices, null=False, default=Types.HODL)
@@ -74,24 +70,24 @@ class Order(models.Model):
         DEL = 2,  'Deleted'
         TAK = 3,  'Waiting for taker bond'
         UCA = 4,  'Cancelled'
-        WF2 = 5,  'Waiting for trade collateral and buyer invoice'
+        EXP = 5,  'Expired'
-        WFE = 6,  'Waiting only for seller trade collateral'
+        WF2 = 6,  'Waiting for trade collateral and buyer invoice'
-        WFI = 7,  'Waiting only for buyer invoice'
+        WFE = 7,  'Waiting only for seller trade collateral'
-        CHA = 8,  'Sending fiat - In chatroom'
+        WFI = 8,  'Waiting only for buyer invoice'
-        CCA = 9,  'Collaboratively cancelled'
+        CHA = 9,  'Sending fiat - In chatroom'
         FSE = 10, 'Fiat sent - In chatroom'
-        FCO = 11, 'Fiat confirmed'
+        DIS = 11, 'In dispute'
-        SUC = 12, 'Sucessfully settled'
+        CCA = 12, 'Collaboratively cancelled'
-        FAI = 13, 'Failed lightning network routing'
+        PAY = 13, 'Sending satoshis to buyer'
-        UPI = 14, 'Updated invoice'
+        SUC = 14, 'Sucessfully settled'
-        DIS = 15, 'In dispute'
+        FAI = 15, 'Failed lightning network routing'
         MLD = 16, 'Maker lost dispute'
         TLD = 17, 'Taker lost dispute'
-        EXP = 18, 'Expired'
     
     currency_dict = json.load(open('./api/currencies.json'))
     currency_choices = [(int(val), label) for val, label in list(currency_dict.items())]
     print(currency_choices)
+
     # order info
     status = models.PositiveSmallIntegerField(choices=Status.choices, null=False, default=Status.WFB)
     created_at = models.DateTimeField(auto_now_add=True)
@@ -101,7 +97,7 @@ class Order(models.Model):
     type = models.PositiveSmallIntegerField(choices=Types.choices, null=False)
     currency = models.PositiveSmallIntegerField(choices=currency_choices, null=False)
     amount = models.DecimalField(max_digits=9, decimal_places=4, validators=[MinValueValidator(0.00001)])
-    payment_method = models.CharField(max_length=30, null=False, default="not specified", blank=True)
+    payment_method = models.CharField(max_length=50, null=False, default="not specified", blank=True)
 
     # order pricing method. A explicit amount of sats, or a relative premium above/below market.
     is_explicit = models.BooleanField(default=False, null=False)
@@ -117,8 +113,11 @@ class Order(models.Model):
     maker = models.ForeignKey(User, related_name='maker', on_delete=models.CASCADE, null=True, default=None)  # unique = True, a maker can only make one order
     taker = models.ForeignKey(User, related_name='taker', on_delete=models.SET_NULL, null=True, default=None, blank=True)  # unique = True, a taker can only take one order
     is_pending_cancel = models.BooleanField(default=False, null=False) # When collaborative cancel is needed and one partner has cancelled.
+    is_disputed = models.BooleanField(default=False, null=False)
+    is_fiat_sent = models.BooleanField(default=False, null=False)
 
-    # order collateral
+    # HTLCs
+    # Order collateral
     maker_bond = models.ForeignKey(LNPayment, related_name='maker_bond', on_delete=models.SET_NULL, null=True, default=None, blank=True)
     taker_bond = models.ForeignKey(LNPayment, related_name='taker_bond', on_delete=models.SET_NULL, null=True, default=None, blank=True)
     trade_escrow = models.ForeignKey(LNPayment, related_name='trade_escrow', on_delete=models.SET_NULL, null=True, default=None, blank=True)
@@ -126,9 +125,13 @@ class Order(models.Model):
     # buyer payment LN invoice
     buyer_invoice = models.ForeignKey(LNPayment, related_name='buyer_invoice', on_delete=models.SET_NULL, null=True, default=None, blank=True)
 
+    # cancel LN invoice // these are only needed to charge lower-than-bond amounts. E.g., a taken order has a small cost if cancelled, to avoid DDOSing.
+    maker_cancel = models.ForeignKey(LNPayment, related_name='maker_cancel', on_delete=models.SET_NULL, null=True, default=None, blank=True)
+    taker_cancel = models.ForeignKey(LNPayment, related_name='taker_cancel', on_delete=models.SET_NULL, null=True, default=None, blank=True)
+
     def __str__(self):
         # Make relational back to ORDER
-        return (f'Order {self.id}: {self.Types(self.type).label} BTC for {self.amount} {self.currency_dict[str(self.currency)]}')
+        return (f'Order {self.id}: {self.Types(self.type).label} BTC for {float(self.amount)} {self.currency_dict[str(self.currency)]}')
 
 @receiver(pre_delete, sender=Order)
 def delelete_HTLCs_at_order_deletion(sender, instance, **kwargs):
@@ -183,3 +186,48 @@ class Profile(models.Model):
     def avatar_tag(self):
         return mark_safe('<img src="%s" width="50" height="50" />' % self.get_avatar())
 
+class MarketTick(models.Model):
+    ''' 
+    Records tick by tick Non-KYC Bitcoin price. 
+    Data to be aggregated and offered via public API.
+
+    It is checked against current cex prices for nice
+    insight on the historical premium of Non-KYC BTC
+
+    Price is set when both taker bond is locked. Both 
+    maker and taker are commited with bonds (contract 
+    is finished and cancellation has a cost)
+    '''
+
+    price = models.DecimalField(max_digits=10, decimal_places=2, default=None, null=True, validators=[MinValueValidator(0)])
+    volume = models.DecimalField(max_digits=8, decimal_places=8, default=None, null=True, validators=[MinValueValidator(0)])
+    premium = models.DecimalField(max_digits=5, decimal_places=2, default=None, null=True, validators=[MinValueValidator(-100), MaxValueValidator(999)], blank=True)
+    currency = models.PositiveSmallIntegerField(choices=Order.currency_choices, null=True)
+    timestamp = models.DateTimeField(auto_now_add=True)
+    
+    # Relevant to keep record of the historical fee, so the insight on the premium can be better analyzed
+    fee = models.DecimalField(max_digits=4, decimal_places=4, default=FEE, validators=[MinValueValidator(0), MaxValueValidator(1)])
+
+    def log_a_tick(order):
+        '''
+        Adds a new tick
+        '''
+        if not order.taker_bond:
+            return None
+
+        elif order.taker_bond.status == LNPayment.Status.LOCKED:
+            volume = order.last_satoshis / 100000000
+            price = float(order.amount) / volume  # Amount Fiat / Amount BTC
+            premium = 100 * (price / get_exchange_rate(Order.currency_dict[str(order.currency)]) - 1)
+
+            tick = MarketTick.objects.create(
+                price=price, 
+                volume=volume, 
+                premium=premium, 
+                currency=order.currency)
+            tick.save()
+
+    def __str__(self):
+        return f'Tick: {self.id}'
+
+

api/urls.py

@@ -1,10 +1,11 @@
 from django.urls import path
-from .views import OrderMakerView, OrderView, UserView, BookView, get_currencies_json
+from .views import MakerView, OrderView, UserView, BookView, InfoView, get_currencies_json
 
 urlpatterns = [
-    path('make/', OrderMakerView.as_view()),
+    path('make/', MakerView.as_view()),
     path('order/', OrderView.as_view({'get':'get','post':'take_update_confirm_dispute_cancel'})),
     path('usergen/', UserView.as_view()),
     path('book/', BookView.as_view()),
+    path('info/', InfoView.as_view()),
     path('currencies/', get_currencies_json),
     ]

api/utils.py

@@ -0,0 +1,12 @@
+
+from decouple import config
+import requests
+
+def get_exchange_rate(currency):
+    # TODO Add fallback Public APIs and error handling
+    # Think about polling price data in a different way (e.g. store locally every t seconds)
+
+    market_prices = requests.get(config('MARKET_PRICE_API')).json()
+    exchange_rate = float(market_prices[currency]['last'])
+
+    return exchange_rate

api/views.py

@@ -25,13 +25,14 @@ import json
 from django.http import HttpResponse
 
 EXP_MAKER_BOND_INVOICE = int(config('EXP_MAKER_BOND_INVOICE'))
+FEE = float(config('FEE'))
 
 avatar_path = Path('frontend/static/assets/avatars')
 avatar_path.mkdir(parents=True, exist_ok=True)
 
 # Create your views here.
 
-class OrderMakerView(CreateAPIView):
+class MakerView(CreateAPIView):
     serializer_class  = MakeOrderSerializer
 
     def post(self,request):
@@ -125,6 +126,18 @@ class OrderView(viewsets.ViewSet):
         data['maker_nick'] = str(order.maker)
         data['taker_nick'] = str(order.taker)
         data['status_message'] = Order.Status(order.status).label
+        data['is_fiat_sent'] = order.is_fiat_sent
+        data['is_disputed'] = order.is_disputed
+
+        # If both bonds are locked, participants can see the trade in sats is also final.
+        if order.taker_bond:
+            if order.maker_bond.status == order.taker_bond.status == LNPayment.Status.LOCKED:
+                # Seller sees the amount he pays
+                if data['is_seller']:
+                    data['trade_satoshis'] = order.last_satoshis
+                # Buyer sees the amount he receives
+                elif data['is_buyer']:
+                    data['trade_satoshis'] = Logics.buyer_invoice_amount(order, request.user)[1]['invoice_amount']
 
         # 5) If status is 'waiting for maker bond' and user is MAKER, reply with a MAKER HODL invoice.
         if order.status == Order.Status.WFB and data['is_maker']:
@@ -170,6 +183,10 @@ class OrderView(viewsets.ViewSet):
                 # add whether a collaborative cancel is pending
                 data['pending_cancel'] = order.is_pending_cancel
         
+        # 9) if buyer confirmed FIAT SENT
+        elif order.status == Order.Status.FSE:
+                data['buyer_confirmed']
+        
         return Response(data, status.HTTP_200_OK)
 
     def take_update_confirm_dispute_cancel(self, request, format=None):
@@ -198,32 +215,42 @@ class OrderView(viewsets.ViewSet):
                 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)
+        # Any other action is only allowed if the user is a participant
-        elif action == 'update_invoice' and invoice:
+        if not (order.maker == request.user or order.taker == request.user):
+            return Response({'bad_request':'You are not a participant in this order'}, status.HTTP_403_FORBIDDEN)
+
+        # 2) If action is 'update invoice'
+        if action == 'update_invoice' and invoice:
             valid, context = Logics.update_invoice(order,request.user,invoice)
-            if not valid: return Response(context,status.HTTP_400_BAD_REQUEST)
+            if not valid: return Response(context, status.HTTP_400_BAD_REQUEST)
         
         # 3) If action is cancel
         elif action == 'cancel':
             valid, context = Logics.cancel_order(order,request.user)
-            if not valid: return Response(context,status.HTTP_400_BAD_REQUEST)
+            if not valid: return Response(context, status.HTTP_400_BAD_REQUEST)
 
         # 4) If action is confirm
         elif action == 'confirm':
-            pass
+            valid, context = Logics.confirm_fiat(order,request.user)
+            if not valid: return Response(context, status.HTTP_400_BAD_REQUEST)
 
         # 5) If action is dispute
         elif action == 'dispute':
-            pass
+            valid, context = Logics.open_dispute(order,request.user, rating)
+            if not valid: return Response(context, status.HTTP_400_BAD_REQUEST)
 
-        # 6) If action is dispute
+        # 6) If action is rate
         elif action == 'rate' and rating:
             valid, context = Logics.rate_counterparty(order,request.user, rating)
-            if not valid: return Response(context,status.HTTP_400_BAD_REQUEST)
+            if not valid: return Response(context, status.HTTP_400_BAD_REQUEST)
 
-        # If nothing... something else is going on. Probably not allowed!
+        # If nothing of the above... something else is going on. Probably not allowed!
         else:
-            return Response({'bad_request':'The Robotic Satoshis working in the warehouse did not understand you'})
+            return Response(
+                {'bad_request':
+                'The Robotic Satoshis working in the warehouse did not understand you. ' + 
+                'Please, fill a Bug Issue in Github https://github.com/Reckless-Satoshi/robosats/issues'},
+                status.HTTP_501_NOT_IMPLEMENTED)
 
         return self.get(request)
 
@@ -298,23 +325,27 @@ class UserView(APIView):
                 # 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)
+                return Response(context, status.HTTP_403_FORBIDDEN)
 
     def delete(self,request):
-        user = User.objects.get(id = request.user.id)
+        ''' Pressing "give me another" deletes the logged in user '''
+        user = request.user
+        if not user:
+            return Response(status.HTTP_403_FORBIDDEN)
 
-        # TO DO. Pressing "give me another" deletes the logged in user
+        # Only delete if user life is shorter than 30 minutes. Helps deleting users by mistake
-        # However it might be a long time recovered user
+        if user.date_joined < (timezone.now() - timedelta(minutes=30)):
-        # Only delete if user live is < 5 minutes
+            return Response(status.HTTP_400_BAD_REQUEST)
 
-        # TODO check if user exists AND it is not a maker or taker!
+        # Check if it is not a maker or taker!
-        if user is not None:
+        if not Logics.validate_already_maker_or_taker(user):
-            logout(request)
+            return Response({'bad_request':'User cannot be deleted while he is part of an order'}, status.HTTP_400_BAD_REQUEST)
-            user.delete()
+
+        logout(request)
+        user.delete()
+        return Response({'user_deleted':'User deleted permanently'}, status.HTTP_301_MOVED_PERMANENTLY)
 
-            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
@@ -342,6 +373,19 @@ class BookView(ListAPIView):
         
         return Response(book_data, status=status.HTTP_200_OK)
 
+class InfoView(ListAPIView):
+
+    def get(self):
+        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.BUY, status=Order.Status.PUB))
+        context['last_day_avg_btc_premium'] = None # Todo
+        context['num_active_robots'] = None 
+        context['total_volume'] = None
+
+        return Response(context, status.HTTP_200_OK)
+
 def get_currencies_json(request):
     currency_dict = json.load(open('./api/currencies.json'))
     return HttpResponse(json.dumps(currency_dict),content_type="application/json")

frontend/src/components/MakerPage.js

@@ -193,7 +193,8 @@ export default class MakerPage extends Component {
                             type="text" 
                             require={true}  
                             inputProps={{
-                                style: {textAlign:"center"}
+                                style: {textAlign:"center"},
+                                maxLength: 50
                             }}
                             onChange={this.handlePaymentMethodChange}
                         />