Merge pull request #20 from Reckless-Satoshi/htlc-model

Htlc model and first logics

.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

@@ -1,8 +1,8 @@
 from django.contrib import admin
-from django.db import models 
+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, Profile
+from .models import Order, LNPayment, Profile
 
 admin.site.unregister(Group)
 admin.site.unregister(User)
@@ -23,14 +23,20 @@ class EUserAdmin(UserAdmin):
         return obj.profile.avatar_tag()
 
 @admin.register(Order)
-class OrderAdmin(admin.ModelAdmin):
+class OrderAdmin(AdminChangeLinksMixin, admin.ModelAdmin):
-    list_display = ('id','type','maker','taker','status','amount','currency','created_at','expires_at')
+    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_links = ('maker','taker')
+    list_display_links = ('id','type')
-    pass
+    change_links = ('maker','taker','buyer_invoice','maker_bond','taker_invoice','taker_bond','trade_escrow')
+
+@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')
 
 @admin.register(Profile)
-class UserProfileAdmin(admin.ModelAdmin):
+class UserProfileAdmin(AdminChangeLinksMixin, admin.ModelAdmin):
-    list_display = ('avatar_tag','user','id','total_ratings','avg_rating','num_disputes','lost_disputes')
+    list_display = ('avatar_tag','id','user_link','total_ratings','avg_rating','num_disputes','lost_disputes')
-    list_display_links =['user']
+    list_display_links = ('avatar_tag','id')
+    change_links =['user']
     readonly_fields = ['avatar_tag']
-    pass

api/lightning.py

@@ -0,0 +1,55 @@
+from datetime import timedelta
+from django.utils import timezone
+
+import random
+import string
+
+#######
+# Placeholder functions
+# Should work with LND (maybe c-lightning in the future)
+
+class LNNode():
+    '''
+    Place holder functions to interact with Lightning Node
+    '''
+    
+    def gen_hodl_invoice(num_satoshis, description, expiry):
+        '''Generates hodl invoice to publish an order'''
+        # TODO
+        invoice = ''.join(random.choices(string.ascii_uppercase + string.digits, k=80)) #FIX
+        payment_hash = ''.join(random.choices(string.ascii_uppercase + string.digits, k=40)) #FIX
+        expires_at = timezone.now() + timedelta(hours=8)  ##FIX
+
+        return invoice, payment_hash, expires_at 
+
+    def validate_hodl_invoice_locked():
+        '''Generates hodl invoice to publish an order'''
+        return True
+
+    def validate_ln_invoice(invoice): # num_satoshis
+        '''Checks if the submited LN invoice is as expected'''
+        valid = True
+        num_satoshis = 50000 # TODO decrypt and confirm sats are as expected
+        description = 'Placeholder desc' # TODO decrypt from LN invoice
+        payment_hash = '567126' # TODO decrypt
+        expires_at = timezone.now() # TODO decrypt
+
+        return valid, num_satoshis, description, payment_hash, expires_at
+
+    def pay_buyer_invoice(invoice):
+        '''Sends sats to buyer'''
+        return True
+
+    def charge_hodl_htlcs(invoice):
+        '''Charges a LN hodl invoice'''
+        return True
+
+    def free_hodl_htlcs(invoice):
+        '''Returns sats'''
+        return True
+
+    
+    
+
+    
+

api/logics.py

@@ -0,0 +1,294 @@
+from datetime import timedelta
+from django.utils import timezone
+import requests
+from .lightning import LNNode
+
+from .models import Order, LNPayment, User
+from decouple import config
+
+FEE = float(config('FEE'))
+BOND_SIZE = float(config('BOND_SIZE'))
+MARKET_PRICE_API = config('MARKET_PRICE_API')
+ESCROW_USERNAME = config('ESCROW_USERNAME')
+
+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'))
+EXP_TRADE_ESCR_INVOICE = int(config('EXP_TRADE_ESCR_INVOICE'))
+
+BOND_EXPIRY = int(config('BOND_EXPIRY'))
+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)
+        if queryset.exists():
+            return False, {'bad_request':'You are already maker of an order'}
+        queryset = Order.objects.filter(taker=user)
+        if queryset.exists():
+            return False, {'bad_request':'You are already taker of an order'}
+        return True, None
+
+    def validate_order_size(order):
+        '''Checks if order is withing limits at t0'''
+        if order.t0_satoshis > MAX_TRADE:
+            return False, {'bad_request': f'Your order is too big. It is worth {order.t0_satoshis} now. But maximum is {MAX_TRADE}'}
+        if order.t0_satoshis < MIN_TRADE:
+            return False, {'bad_request': f'Your order is too small. It is worth {order.t0_satoshis} now. But minimum is {MIN_TRADE}'}
+        return True, None
+        
+    def take(order, user):
+        order.taker = user
+        order.status = Order.Status.TAK
+        order.save()
+
+    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 satoshis_now(order):
+        ''' checks trade amount in sats '''
+        if order.is_explicit:
+            satoshis_now = order.satoshis
+        else:
+            # 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(MARKET_PRICE_API).json()
+            exchange_rate = float(market_prices[Order.Currencies(order.currency).label]['last'])
+            satoshis_now = ((float(order.amount) * 1+float(order.premium)) / exchange_rate) * 100*1000*1000
+
+        return int(satoshis_now)
+    
+    def order_expires(order):
+        order.status = Order.Status.EXP
+        order.maker = None
+        order.taker = None
+        order.save()
+
+    @classmethod
+    def buyer_invoice_amount(cls, order, user):
+        ''' Computes buyer invoice amount. Uses order.last_satoshis, 
+        that is the final trade amount set at Taker Bond time'''
+
+        if cls.is_buyer(order, user):
+            invoice_amount = int(order.last_satoshis * (1-FEE)) # Trading FEE is charged here.
+
+        return True, {'invoice_amount': invoice_amount}
+
+    @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
+        if not (cls.is_buyer(order, user) or is_valid_invoice):
+            return False, {'bad_request':'Invalid Lightning Network Invoice. It starts by LNTB...'}
+
+        order.buyer_invoice, _ = LNPayment.objects.update_or_create(
+            concept = LNPayment.Concepts.PAYBUYER, 
+            type = LNPayment.Types.NORM, 
+            sender = User.objects.get(username=ESCROW_USERNAME),
+            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' :  description,
+                'payment_hash' : payment_hash,
+                'expires_at' : expires_at}
+            )
+
+        # If the order status is 'Waiting for invoice'. Move forward to 'waiting for invoice'
+        if order.status == Order.Status.WFE: order.status = Order.Status.CHA
+
+        # If the order status is 'Waiting for both'. Move forward to 'waiting for escrow' or to 'chat'
+        if order.status == Order.Status.WF2:
+            print(order.trade_escrow)
+            if order.trade_escrow:
+                if order.trade_escrow.status == LNPayment.Status.LOCKED:
+                    order.status = Order.Status.CHA
+            else:
+                order.status = Order.Status.WFE
+
+        # If the order status was Payment Failed. Move forward to invoice Updated.
+        if order.status == Order.Status.FAI:
+            order.status = Order.Status.UPI
+
+        order.save()
+        return True, None
+
+    @classmethod
+    def rate_counterparty(cls, order, user, rating):
+        # if maker, rates taker
+        if order.maker == user:
+            order.taker.profile.total_ratings = order.taker.profile.total_ratings + 1
+            last_ratings = list(order.taker.profile.last_ratings).append(rating)
+            order.taker.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)
+
+        order.save()
+        return True, None
+
+    @classmethod
+    def cancel_order(cls, order, user, state):
+
+        # 1) When maker cancels before bond
+        '''The order never shows up on the book and order 
+        status becomes "cancelled". That's it.'''
+        if order.status == Order.Status.WFB and order.maker == user:
+            order.maker = None
+            order.status = Order.Status.UCA
+            order.save()
+            return True, None
+
+        # 2) When maker cancels after bond
+            '''The order dissapears from book and goes to cancelled. 
+            Maker is charged a small amount of sats, to prevent DDOS 
+            on the LN node and order book'''
+
+        # 3) When taker cancels before bond
+            ''' The order goes back to the book as public.
+            LNPayment "order.taker_bond" is deleted() '''
+
+        # 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.'''
+
+        # 5) When trade collateral has been posted (after escrow)
+            '''Always goes to cancelled status. Collaboration  is needed.
+            When a user asks for cancel, 'order.is_pending_cancel' goes True.
+            When the second user asks for cancel. Order is totally cancelled.
+            Has a small cost for both parties to prevent node DDOS.'''
+        
+        else:
+            return False, {'bad_request':'You cannot cancel this order'}
+
+    @classmethod
+    def gen_maker_hodl_invoice(cls, order, user):
+
+        # Do not gen and cancel if order is more than 5 minutes old
+        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 order.maker_bond.status == LNPayment.Status.INVGEN:
+                return True, {'bond_invoice':order.maker_bond.invoice,'bond_satoshis':order.maker_bond.num_satoshis}
+            else:
+                return False, None
+
+        order.last_satoshis = cls.satoshis_now(order)
+        bond_satoshis = int(order.last_satoshis * BOND_SIZE)
+        description = f'RoboSats - Publishing {str(order)} - This bond will return to you if you do not cheat.'
+
+        # Gen HODL Invoice
+        invoice, payment_hash, expires_at = LNNode.gen_hodl_invoice(bond_satoshis, description, BOND_EXPIRY*3600)
+        
+        order.maker_bond = LNPayment.objects.create(
+            concept = LNPayment.Concepts.MAKEBOND, 
+            type = LNPayment.Types.HODL, 
+            sender = user,
+            receiver = User.objects.get(username=ESCROW_USERNAME),
+            invoice = invoice,
+            status = LNPayment.Status.INVGEN,
+            num_satoshis = bond_satoshis,
+            description =  description,
+            payment_hash = payment_hash,
+            expires_at = expires_at)
+
+        order.save()
+        return True, {'bond_invoice':invoice,'bond_satoshis':bond_satoshis}
+
+    @classmethod
+    def gen_taker_hodl_invoice(cls, order, user):
+
+        # Do not gen and cancel if a taker invoice is there and older than X minutes and unpaid still
+        if order.taker_bond:
+            # Check if status is INVGEN and still not expired
+            if order.taker_bond.status == LNPayment.Status.INVGEN:
+                if order.taker_bond.created_at > (timezone.now()+timedelta(minutes=EXP_TAKER_BOND_INVOICE)):
+                    cls.cancel_order(order, user, 3) # State 3, cancel order before taker bond
+                    return False, {'bad_request':'Invoice expired. You did not confirm taking the order in time.'}
+                # Return the previous invoice there was with INVGEN status
+                else:
+                    return True, {'bond_invoice':order.taker_bond.invoice,'bond_satoshis':order.taker_bond.num_satoshis}
+            # Invoice exists, but was already locked or settled
+            else:
+                return False, None
+
+        order.last_satoshis = cls.satoshis_now(order)  # LOCKS THE AMOUNT OF SATOSHIS FOR THE TRADE
+        bond_satoshis = int(order.last_satoshis * BOND_SIZE)
+        description = f'RoboSats - Taking {str(order)} - This bond will return to you if you do not cheat.'
+
+        # Gen HODL Invoice
+        invoice, payment_hash, expires_at = LNNode.gen_hodl_invoice(bond_satoshis, description, BOND_EXPIRY*3600)
+        
+        order.taker_bond = LNPayment.objects.create(
+            concept = LNPayment.Concepts.TAKEBOND, 
+            type = LNPayment.Types.HODL, 
+            sender = user,
+            receiver = User.objects.get(username=ESCROW_USERNAME),
+            invoice = invoice,
+            status = LNPayment.Status.INVGEN,
+            num_satoshis = bond_satoshis,
+            description =  description,
+            payment_hash = payment_hash,
+            expires_at = expires_at)
+
+        order.save()
+        return True, {'bond_invoice':invoice,'bond_satoshis': bond_satoshis}
+
+    @classmethod
+    def gen_escrow_hodl_invoice(cls, order, user):
+
+        # Do not generate and cancel if an invoice is there and older than X minutes and unpaid still
+        if order.trade_escrow:
+            # Check if status is INVGEN and still not expired
+            if order.taker_bond.status == LNPayment.Status.INVGEN:
+                if order.taker_bond.created_at > (timezone.now()+timedelta(minutes=EXP_TRADE_ESCR_INVOICE)): # Expired
+                    cls.cancel_order(order, user, 4) # State 4, cancel order before trade escrow locked
+                    return False, {'bad_request':'Invoice expired. You did not lock the trade escrow in time.'}
+                # Return the previous invoice there was with INVGEN status
+                else:
+                    return True, {'escrow_invoice':order.trade_escrow.invoice,'escrow_satoshis':order.trade_escrow.num_satoshis}
+            # Invoice exists, but was already locked or settled
+            else:
+                return False, None # Does not return any context of a healthy locked escrow
+
+        escrow_satoshis = order.last_satoshis # Trade sats amount was fixed at the time of taker bond generation (order.last_satoshis)
+        description = f'RoboSats - Escrow amount for {str(order)} - This escrow will be released to the buyer once you confirm you received the fiat.'
+
+        # Gen HODL Invoice
+        invoice, payment_hash, expires_at = LNNode.gen_hodl_invoice(escrow_satoshis, description, ESCROW_EXPIRY*3600)
+        
+        order.taker_bond = LNPayment.objects.create(
+            concept = LNPayment.Concepts.TRESCROW, 
+            type = LNPayment.Types.HODL, 
+            sender = user,
+            receiver = User.objects.get(username=ESCROW_USERNAME),
+            invoice = invoice,
+            status = LNPayment.Status.INVGEN,
+            num_satoshis = escrow_satoshis,
+            description =  description,
+            payment_hash = payment_hash,
+            expires_at = expires_at)
+
+        order.save()
+        return True, {'escrow_invoice':invoice,'escrow_satoshis': escrow_satoshis}

api/models.py

@@ -3,16 +3,63 @@ from django.contrib.auth.models import User
 from django.core.validators import MaxValueValidator, MinValueValidator, validate_comma_separated_integer_list
 from django.db.models.signals import post_save, pre_delete
 from django.dispatch import receiver
-
 from django.utils.html import mark_safe
 
+from decouple import config
 from pathlib import Path
 
 #############################
 # TODO
 # Load hparams from .env file
-min_satoshis_trade = 10*1000
+
-max_satoshis_trade = 500*1000
+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):
+        NORM = 0, 'Regular invoice' # Only outgoing HTLCs will be regular invoices (Non-hodl)
+        HODL = 1, 'Hodl invoice'
+
+    class Concepts(models.IntegerChoices):
+        MAKEBOND = 0, 'Maker bond'
+        TAKEBOND = 1, 'Taker bond'
+        TRESCROW = 2, 'Trade escrow'
+        PAYBUYER = 3, 'Payment to buyer'
+
+    class Status(models.IntegerChoices):
+        INVGEN = 0, 'Generated'
+        LOCKED = 1, 'Locked'
+        SETLED = 2, 'Settled'
+        RETNED = 3, 'Returned'
+        MISSNG = 4, 'Missing'
+        VALIDI = 5, 'Valid'
+        INFAIL = 6, 'Failed routing'
+
+    # payment use details
+    type = models.PositiveSmallIntegerField(choices=Types.choices, null=False, default=Types.HODL)
+    concept = models.PositiveSmallIntegerField(choices=Concepts.choices, null=False, default=Concepts.MAKEBOND)
+    status = models.PositiveSmallIntegerField(choices=Status.choices, null=False, default=Status.INVGEN)
+    routing_retries = models.PositiveSmallIntegerField(null=False, default=0)
+    
+    # payment info
+    invoice = models.CharField(max_length=300, unique=False, null=True, default=None, blank=True)
+    payment_hash = models.CharField(max_length=300, unique=False, null=True, default=None, blank=True)
+    description = models.CharField(max_length=300, unique=False, null=True, default=None, blank=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+    expires_at = models.DateTimeField()
+    num_satoshis = models.PositiveBigIntegerField(validators=[MinValueValidator(MIN_TRADE*BOND_SIZE), MaxValueValidator(MAX_TRADE*(1+BOND_SIZE+FEE))])
+    
+    # involved parties
+    sender = models.ForeignKey(User, related_name='sender', on_delete=models.CASCADE, null=True, default=None)
+    receiver = models.ForeignKey(User, related_name='receiver', on_delete=models.CASCADE, null=True, default=None)
+
+    def __str__(self):
+        return (f'HTLC {self.id}: {self.Concepts(self.concept).label} - {self.Status(self.status).label}')
 
 class Order(models.Model):
     
@@ -25,30 +72,29 @@ class Order(models.Model):
         EUR = 2, 'EUR'
         ETH = 3, 'ETH'
 
-    class Status(models.TextChoices):
+    class Status(models.IntegerChoices):
-        WFB = 0, 'Waiting for bond'
+        WFB = 0,  'Waiting for maker bond'
-        PUB = 1, 'Published in order book'
+        PUB = 1,  'Public'
-        DEL = 2, 'Deleted from order book'
+        DEL = 2,  'Deleted'
-        TAK = 3, 'Taken'
+        TAK = 3,  'Waiting for taker bond'
-        UCA = 4, 'Unilaterally cancelled'
+        UCA = 4,  'Cancelled'
-        RET = 5, 'Returned to order book' # Probably same as 1 in most cases.
+        WF2 = 5,  'Waiting for trade collateral and buyer invoice'
-        WF2 = 6, 'Waiting for trade collateral and buyer invoice'
+        WFE = 6,  'Waiting only for seller trade collateral'
-        WTC = 7, 'Waiting only for trade collateral'
+        WFI = 7,  'Waiting only for buyer invoice'
-        WBI = 8, 'Waiting only for buyer invoice'
+        CHA = 8,  'Sending fiat - In chatroom'
-        EXF = 9, 'Exchanging fiat / In chat'
+        CCA = 9,  'Collaboratively cancelled'
-        CCA = 10, 'Collaboratively cancelled'
+        FSE = 10, 'Fiat sent - In chatroom'
-        FSE = 11, 'Fiat sent'
+        FCO = 11, 'Fiat confirmed'
-        FCO = 12, 'Fiat confirmed'
+        SUC = 12, 'Sucessfully settled'
-        SUC = 13, 'Sucessfully settled'
+        FAI = 13, 'Failed lightning network routing'
-        FAI = 14, 'Failed lightning network routing'
+        UPI = 14, 'Updated invoice'
-        UPI = 15, 'Updated invoice'
+        DIS = 15, 'In dispute'
-        DIS = 16, 'In dispute'
+        MLD = 16, 'Maker lost dispute'
-        MLD = 17, 'Maker lost dispute'
+        TLD = 17, 'Taker lost dispute'
-        TLD = 18, 'Taker lost dispute'
+        EXP = 18, 'Expired'
-        EXP = 19, 'Expired'
 
-    # order info, id = models.CharField(max_length=64, unique=True, null=False)
+    # order info
-    status = models.PositiveSmallIntegerField(choices=Status.choices, default=Status.WFB)
+    status = models.PositiveSmallIntegerField(choices=Status.choices, null=False, default=Status.WFB)
     created_at = models.DateTimeField(auto_now_add=True)
     expires_at = models.DateTimeField()
 
@@ -56,42 +102,60 @@ class Order(models.Model):
     type = models.PositiveSmallIntegerField(choices=Types.choices, null=False)
     currency = models.PositiveSmallIntegerField(choices=Currencies.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")
+    payment_method = models.CharField(max_length=30, null=False, default="not specified", blank=True)
-    premium = models.DecimalField(max_digits=5, decimal_places=2, default=0, null=True, validators=[MinValueValidator(-100), MaxValueValidator(999)])
+
-    satoshis = models.PositiveBigIntegerField(null=True, validators=[MinValueValidator(min_satoshis_trade), MaxValueValidator(max_satoshis_trade)])
+    # order pricing method. A explicit amount of sats, or a relative premium above/below market.
-    is_explicit = models.BooleanField(default=False, null=False) # pricing method. A explicit amount of sats, or a relative premium above/below market.
+    is_explicit = models.BooleanField(default=False, null=False)
+    # marked to market
+    premium = models.DecimalField(max_digits=5, decimal_places=2, default=0, null=True, validators=[MinValueValidator(-100), MaxValueValidator(999)], blank=True)
+    # explicit
+    satoshis = models.PositiveBigIntegerField(null=True, validators=[MinValueValidator(MIN_TRADE), MaxValueValidator(MAX_TRADE)], blank=True)
+    # how many sats at creation and at last check (relevant for marked to market)
+    t0_satoshis = models.PositiveBigIntegerField(null=True, validators=[MinValueValidator(MIN_TRADE), MaxValueValidator(MAX_TRADE)], blank=True) # sats at creation
+    last_satoshis = models.PositiveBigIntegerField(null=True, validators=[MinValueValidator(0), MaxValueValidator(MAX_TRADE*2)], blank=True) # sats last time checked. Weird if 2* trade max...
     
     # order participants
     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)  # unique = True, a taker can only take 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.
 
     # order collateral
-    has_maker_bond = models.BooleanField(default=False, null=False)
+    maker_bond = models.ForeignKey(LNPayment, related_name='maker_bond', on_delete=models.SET_NULL, null=True, default=None, blank=True)
-    has_taker_bond = models.BooleanField(default=False, null=False)
+    taker_bond = models.ForeignKey(LNPayment, related_name='taker_bond', on_delete=models.SET_NULL, null=True, default=None, blank=True)
-    has_trade_collat = models.BooleanField(default=False, null=False)
+    trade_escrow = models.ForeignKey(LNPayment, related_name='trade_escrow', on_delete=models.SET_NULL, null=True, default=None, blank=True)
-
-    maker_bond_secret = models.CharField(max_length=300, unique=False, null=True, default=None)
-    taker_bond_secret = models.CharField(max_length=300, unique=False, null=True, default=None)
-    trade_collat_secret = models.CharField(max_length=300, unique=False, null=True, default=None)
 
     # buyer payment LN invoice
-    has_invoice = models.BooleanField(default=False, null=False) # has invoice and is valid
+    buyer_invoice = models.ForeignKey(LNPayment, related_name='buyer_invoice', on_delete=models.SET_NULL, null=True, default=None, blank=True)
-    invoice = models.CharField(max_length=300, unique=False, null=True, default=None)
+
+    def __str__(self):
+        # Make relational back to ORDER
+        return (f'Order {self.id}: {self.Types(self.type).label} BTC for {self.amount} {self.Currencies(self.currency).label}')
+
+@receiver(pre_delete, sender=Order)
+def delelete_HTLCs_at_order_deletion(sender, instance, **kwargs):
+    to_delete = (instance.maker_bond, instance.buyer_invoice, instance.taker_bond, instance.trade_escrow)
+
+    for htlc in to_delete:
+        try:
+            htlc.delete()
+        except:
+            pass
 
 class Profile(models.Model):
+
     user = models.OneToOneField(User,on_delete=models.CASCADE)
 
     # Ratings stored as a comma separated integer list
     total_ratings = models.PositiveIntegerField(null=False, default=0) 
-    latest_ratings = models.CharField(max_length=999, null=True, default=None, validators=[validate_comma_separated_integer_list]) # Will only store latest ratings
+    latest_ratings = models.CharField(max_length=999, null=True, default=None, validators=[validate_comma_separated_integer_list], blank=True) # Will only store latest ratings
-    avg_rating = models.DecimalField(max_digits=4, decimal_places=1, default=None, null=True, validators=[MinValueValidator(0), MaxValueValidator(100)])
+    avg_rating = models.DecimalField(max_digits=4, decimal_places=1, default=None, null=True, validators=[MinValueValidator(0), MaxValueValidator(100)], blank=True)
 
     # Disputes
     num_disputes = models.PositiveIntegerField(null=False, default=0)
     lost_disputes = models.PositiveIntegerField(null=False, default=0)
 
     # RoboHash
-    avatar = models.ImageField(default="static/assets/avatars/unknown.png", verbose_name='Avatar')
+    avatar = models.ImageField(default="static/assets/misc/unknown_avatar.png", verbose_name='Avatar', blank=True)
 
     @receiver(post_save, sender=User)
     def create_user_profile(sender, instance, created, **kwargs):
@@ -102,15 +166,21 @@ class Profile(models.Model):
     def save_user_profile(sender, instance, **kwargs):
         instance.profile.save()
 
+    @receiver(pre_delete, sender=User)
+    def del_avatar_from_disk(sender, instance, **kwargs):
+        avatar_file=Path('frontend/' + instance.profile.avatar.url)
+        avatar_file.unlink() # FIX deleting user fails if avatar is not found
+
     def __str__(self):
         return self.user.username
     
     # to display avatars in admin panel
     def get_avatar(self):
         if not self.avatar:
-            return 'static/assets/avatars/unknown.png'
+            return 'static/assets/misc/unknown_avatar.png'
         return self.avatar.url
 
     # method to create a fake table field in read only mode
     def avatar_tag(self):
         return mark_safe('<img src="%s" width="50" height="50" />' % self.get_avatar())
+

api/serializers.py

@@ -1,7 +1,7 @@
 from rest_framework import serializers
 from .models import Order
 
-class OrderSerializer(serializers.ModelSerializer):
+class ListOrderSerializer(serializers.ModelSerializer):
     class Meta:
         model = Order
         fields = ('id','status','created_at','expires_at','type','currency','amount','payment_method','is_explicit','premium','satoshis','maker','taker')
@@ -10,3 +10,8 @@ class MakeOrderSerializer(serializers.ModelSerializer):
     class Meta:
         model = Order
         fields = ('type','currency','amount','payment_method','is_explicit','premium','satoshis')
+
+class UpdateOrderSerializer(serializers.Serializer):
+    invoice = serializers.CharField(max_length=300, allow_null=True, allow_blank=True, default=None)
+    action = serializers.ChoiceField(choices=('take','update_invoice','dispute','cancel','confirm','rate'), allow_null=False)
+    rating = serializers.ChoiceField(choices=('1','2','3','4','5'), allow_null=True, allow_blank=True, default=None)

api/urls.py

@@ -1,9 +1,9 @@
 from django.urls import path
-from .views import MakeOrder, OrderView, UserGenerator, BookView
+from .views import OrderMakerView, OrderView, UserView, BookView
 
 urlpatterns = [
-    path('make/', MakeOrder.as_view()),
+    path('make/', OrderMakerView.as_view()),
-    path('order/', OrderView.as_view()),
+    path('order/', OrderView.as_view({'get':'get','post':'take_update_confirm_dispute_cancel'})),
-    path('usergen/', UserGenerator.as_view()),
+    path('usergen/', UserView.as_view()),
     path('book/', BookView.as_view()),
     ]

api/views.py

@@ -1,12 +1,14 @@
-from rest_framework import serializers, status
+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 django.conf.urls.static import static
 
-from .serializers import OrderSerializer, MakeOrderSerializer
+from .serializers import ListOrderSerializer, MakeOrderSerializer, UpdateOrderSerializer
-from .models import Order
+from .models import LNPayment, Order
+from .logics import Logics
 
 from .nick_generator.nick_generator import NickGenerator
 from robohash import Robohash
@@ -17,23 +19,24 @@ import hashlib
 from pathlib import Path
 from datetime import timedelta
 from django.utils import timezone
+from decouple import config
 
-# .env
+EXP_MAKER_BOND_INVOICE = int(config('EXP_MAKER_BOND_INVOICE'))
-expiration_time = 8
 
 avatar_path = Path('frontend/static/assets/avatars')
 avatar_path.mkdir(parents=True, exist_ok=True)
 
 # Create your views here.
 
-class MakeOrder(APIView):
+class OrderMakerView(CreateAPIView):
     serializer_class  = MakeOrderSerializer
 
     def post(self,request):
         serializer = self.serializer_class(data=request.data)
 
-        if serializer.is_valid():
+        if not serializer.is_valid(): return Response(status=status.HTTP_400_BAD_REQUEST)
-            otype = serializer.data.get('type')
+
+        type = serializer.data.get('type')
         currency = serializer.data.get('currency')
         amount = serializer.data.get('amount')
         payment_method = serializer.data.get('payment_method')
@@ -41,70 +44,187 @@ class MakeOrder(APIView):
         satoshis = serializer.data.get('satoshis')
         is_explicit = serializer.data.get('is_explicit')
 
-            # query if the user is already a maker or taker, return error
+        valid, context = Logics.validate_already_maker_or_taker(request.user)
-            queryset = Order.objects.filter(maker=request.user.id)
+        if not valid: return Response(context, status.HTTP_409_CONFLICT)
-            if queryset.exists():
-                return Response({'Bad Request':'You are already maker of an order'},status=status.HTTP_400_BAD_REQUEST)
-            queryset = Order.objects.filter(taker=request.user.id)
-            if queryset.exists():
-                return Response({'Bad Request':'You are already taker of an order'},status=status.HTTP_400_BAD_REQUEST) 
 
-            # Creates a new order in db
+        # Creates a new order
         order = Order(
-                type=otype,
+            type=type,
             currency=currency,
             amount=amount,
             payment_method=payment_method,
             premium=premium,
             satoshis=satoshis,
             is_explicit=is_explicit,
-                expires_at= timezone.now()+timedelta(hours=expiration_time),
+            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)
-        if not serializer.is_valid():
-            return Response(status=status.HTTP_400_BAD_REQUEST)
-            
-        return Response(OrderSerializer(order).data, status=status.HTTP_201_CREATED)
 
 
-class OrderView(APIView):
+class OrderView(viewsets.ViewSet):
-    serializer_class = OrderSerializer
+    serializer_class = UpdateOrderSerializer
     lookup_url_kwarg = 'order_id'
 
     def get(self, request, format=None):
+        '''
+        Full trade pipeline takes place while looking/refreshing the order page.
+        '''
         order_id = request.GET.get(self.lookup_url_kwarg)
 
-        if order_id != None:
+        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 :
+        if len(order) != 1 :
+            return Response({'bad_request':'Invalid Order Id'}, status.HTTP_404_NOT_FOUND)
+        
+        # This is our order.
         order = order[0]
-                data = self.serializer_class(order).data
-                nickname = request.user.username
 
-                # Check if requester is participant in the order and add boolean to response
+        # 1) If order expired
-                data['is_participant'] = (str(order.maker) == nickname or str(order.taker) == nickname)
+        if order.status == Order.Status.EXP:
+            return Response({'bad_request':'This order has expired'},status.HTTP_400_BAD_REQUEST)
 
-                #To do fix: data['status_message'] = Order.Status.get(order.status).label
+        # 2) If order cancelled
-                data['status_message'] = Order.Status.WFB.label # Hardcoded WFB, should use order.status value.
+        if order.status == Order.Status.UCA:
+            return Response({'bad_request':'This order has been cancelled by the maker'},status.HTTP_400_BAD_REQUEST)
+        if order.status == Order.Status.CCA:
+            return Response({'bad_request':'This order has been cancelled collaborativelly'},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']
+        
+        # 3) 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':'You are not allowed to see this order'},status.HTTP_403_FORBIDDEN)
+        
+        # 4) 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 
 
-                if data['is_participant']:
+        # 5) If status is 'waiting for maker bond' and user is MAKER, reply with a MAKER HODL invoice.
-                    return Response(data, status=status.HTTP_200_OK)
+        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:
-                    # Non participants should not see the status or who is the taker
+                return Response(context, status.HTTP_400_BAD_REQUEST)
-                    data.pop('status','status_message','taker','taker_nick')
-                    return Response(data, status=status.HTTP_200_OK)
         
-            return Response({'Order Not Found':'Invalid Order Id'},status=status.HTTP_404_NOT_FOUND)
+        # 6)  If status is 'waiting for taker bond' and user is TAKER, reply with a TAKER HODL invoice.
+        elif order.status == Order.Status.TAK and data['is_taker']:
+            valid, context = Logics.gen_taker_hodl_invoice(order, request.user)
+            if valid:
+                data = {**data, **context}
+            else:
+                return Response(context, status.HTTP_400_BAD_REQUEST)
         
-        return Response({'Bad Request':'Order ID parameter not found in request'}, status=status.HTTP_400_BAD_REQUEST)
+        # 7) If status is 'WF2'or'WTC' 
+        elif (order.status == Order.Status.WF2 or order.status == Order.Status.WFE):
 
-class UserGenerator(APIView):
+            # If the two bonds are locked
+            if order.maker_bond.status == order.taker_bond.status == LNPayment.Status.LOCKED:
+
+                # 7.a) And if user is Seller, reply with an ESCROW HODL invoice.
+                if data['is_seller']:
+                    valid, context = Logics.gen_escrow_hodl_invoice(order, request.user)
+                    if valid:
+                        data = {**data, **context}
+                    else:
+                        return Response(context, status.HTTP_400_BAD_REQUEST)
+
+                # 7.b) If user is Buyer, reply with an AMOUNT so he can send the buyer invoice.
+                elif data['is_buyer']:
+                    valid, context = Logics.buyer_invoice_amount(order, request.user)
+                    if valid:
+                        data = {**data, **context}
+                    else:
+                        return Response(context, status.HTTP_400_BAD_REQUEST)
+
+        # 8) If status is 'CHA'or '' or '' and all HTLCS are in LOCKED
+        elif order.status == Order.Status.CHA: # TODO Add the other status
+            if order.maker_bond.status == order.taker_bond.status == order.trade_escrow.status == LNPayment.Status.LOCKED:
+                # add whether a collaborative cancel is pending
+                data['pending_cancel'] = order.is_pending_cancel
+
+        return Response(data, status.HTTP_200_OK)
+
+    def take_update_confirm_dispute_cancel(self, request, format=None):
+        '''
+        Here take place all of the user updates to the order object.
+        That is: take, confim, cancel, dispute, update_invoice or rate.
+        '''
+        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_invoice' and invoice:
+            valid, context = Logics.update_invoice(order,request.user,invoice)
+            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)
+
+        # 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:
+            valid, context = Logics.rate_counterparty(order,request.user, rating)
+            if not valid: return Response(context,status.HTTP_400_BAD_REQUEST)
+
+        # If nothing... 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 self.get(request)
+
+class UserView(APIView):
     lookup_url_kwarg = 'token'
     NickGen = NickGenerator(
         lang='English', 
@@ -113,6 +233,7 @@ class UserGenerator(APIView):
         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
@@ -128,8 +249,7 @@ class UserGenerator(APIView):
         value, counts = np.unique(list(token), return_counts=True)
         shannon_entropy = entropy(counts, base=62)
         bits_entropy = log2(len(value)**len(token))
-
+        # Payload
-        # Start preparing 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
@@ -140,11 +260,11 @@ class UserGenerator(APIView):
         # Hashes the token, only 1 iteration. Maybe more is better.
         hash = hashlib.sha256(str.encode(token)).hexdigest() 
 
-        # generate nickname
+        # Generate nickname
         nickname = self.NickGen.short_from_SHA256(hash, max_length=18)[0] 
         context['nickname'] = nickname
 
-        # generate avatar
+        # Generate avatar
         rh = Robohash(hash)
         rh.assemble(roboset='set1', bgset='any')# for backgrounds ON
 
@@ -155,7 +275,7 @@ class UserGenerator(APIView):
             with open(image_path, "wb") as f:
                 rh.img.save(f, format="png")
 
-        # Create new credentials and logsin if nickname is new
+        # 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)
@@ -180,40 +300,40 @@ class UserGenerator(APIView):
     def delete(self,request):
         user = User.objects.get(id = request.user.id)
 
-        # TO DO. Pressing give me another will delete the logged in user
+        # 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:
-            avatar_file = avatar_path.joinpath(str(request.user)+".png")
-            avatar_file.unlink() # Unsafe if avatar does not exist.
             logout(request)
             user.delete()
 
-            return Response({'user_deleted':'User deleted permanently'},status=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(APIView):
+class BookView(ListAPIView):
-    serializer_class = OrderSerializer
+    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=0) # TODO status = 1 for orders that are Public
+        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 = OrderSerializer(order).data
+            data = ListOrderSerializer(order).data
             user = User.objects.filter(id=data['maker'])
             if len(user) == 1:
                 data['maker_nick'] = user[0].username
-            # TODO avoid sending status and takers for book views
+            
-            #data.pop('status','taker')
+            # 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)

dev_utils/reinitiate_db.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+rm db.sqlite3
+
+rm -R api/migrations
+rm -R frontend/migrations
+rm -R frontend/static/assets/avatars
+
+python3 manage.py makemigrations
+python3 manage.py makemigrations api
+
+python3 manage.py migrate
+
+python3 manage.py createsuperuser
+
+python3 manage.py runserver

frontend/src/components/BookPage.js

@@ -1,5 +1,6 @@
 import React, { Component } from "react";
-import { Paper, Button , Divider, Card, CardActionArea, CardContent, Typography, Grid, Select, MenuItem, FormControl, FormHelperText, List, ListItem, ListItemText, Avatar, Link, RouterLink, ListItemAvatar} from "@material-ui/core"
+import { Button , Divider, Card, CardActionArea, CardContent, Typography, Grid, Select, MenuItem, FormControl, FormHelperText, List, ListItem, ListItemText, Avatar, RouterLink, ListItemAvatar} from "@material-ui/core"
+import { Link } from 'react-router-dom'
 
 export default class BookPage extends Component {
   constructor(props) {
@@ -13,18 +14,20 @@ export default class BookPage extends Component {
     this.state.currencyCode = this.getCurrencyCode(this.state.currency)
   }
 
-  // Fix needed to handle HTTP 404 error when no order is found
   // Show message to be the first one to make an order
   getOrderDetails() {
     fetch('/api/book' + '?currency=' + this.state.currency + "&type=" + this.state.type)
       .then((response) => response.json())
       .then((data) => //console.log(data));
-      this.setState({orders: data}));
+      this.setState({
+        orders: data,
+        not_found: data.not_found,
+      }));
   }
 
   handleCardClick=(e)=>{
-    console.log(e.target)
+    console.log(e)
-    this.props.history.push('/order/' + e.target);
+    this.props.history.push('/order/' + e);
   }
 
   // Make these two functions sequential. getOrderDetails needs setState to be finish beforehand.
@@ -53,6 +56,63 @@ export default class BookPage extends Component {
     return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
   }
 
+  bookCards=()=>{
+    return (this.state.orders.map((order) =>
+    <Grid container item sm={4}>
+      <Card elevation={6} sx={{ width: 945 }}>
+
+        <CardActionArea value={order.id} onClick={() => this.handleCardClick(order.id)}>
+          <CardContent>
+
+            <List dense="true">
+              <ListItem >
+              <ListItemAvatar >
+                  <Avatar
+                      alt={order.maker_nick}
+                      src={window.location.origin +'/static/assets/avatars/' + order.maker_nick + '.png'} 
+                      />
+                </ListItemAvatar>
+                <ListItemText>
+                  <Typography gutterBottom variant="h6">
+                    {order.maker_nick}
+                  </Typography>
+                </ListItemText>
+              </ListItem>
+
+              {/* CARD PARAGRAPH CONTENT */}
+              <ListItemText>
+                <Typography variant="subtitle1" color="text.secondary">
+                ◑{order.type == 0 ? <b> Buys </b>: <b> Sells </b>} 
+                  <b>{parseFloat(parseFloat(order.amount).toFixed(4))}
+                  {" " +this.getCurrencyCode(order.currency)}</b> <a> worth of bitcoin</a> 
+                </Typography>
+
+                <Typography variant="subtitle1" color="text.secondary">
+                ◑ Payment via <b>{order.payment_method}</b>
+                </Typography>
+{/* 
+                <Typography variant="subtitle1" color="text.secondary">
+                ◑ Priced {order.is_explicit ? 
+                  " explicitly at " + this.pn(order.satoshis) + " Sats" : (
+                  " at " + 
+                  parseFloat(parseFloat(order.premium).toFixed(4)) + "% over the market"                     
+                  )}
+                </Typography> */}
+
+                <Typography variant="subtitle1" color="text.secondary">
+                ◑ <b>{" 42,354 "}{this.getCurrencyCode(order.currency)}/BTC</b>  (Binance API)
+                </Typography>
+              </ListItemText>
+
+            </List>
+
+          </CardContent>
+        </CardActionArea>
+      </Card>
+      </Grid>
+    ));
+  }
+
   render() {
       return (
         <Grid className='orderBook' container spacing={1}>
@@ -102,66 +162,30 @@ export default class BookPage extends Component {
               </Select>
             </FormControl>
           </Grid>
-          {this.state.orders.map((order) =>
+        { this.state.not_found ? "" :
-          <Grid container item sm={4}>
-            <Card elevation={6} sx={{ width: 945 }}>
-
-              {/* To fix! does not pass order.id to handleCardCLick. Instead passes the clicked </>*/}
-              <CardActionArea value={order.id} onClick={this.handleCardClick}>
-                <CardContent>
-
-                  <List dense="true">
-                    <ListItem >
-                    <ListItemAvatar >
-                        <Avatar
-                            alt={order.maker_nick}
-                            src={window.location.origin +'/static/assets/avatars/' + order.maker_nick + '.png'} 
-                            />
-                      </ListItemAvatar>
-                      <ListItemText>
-                        <Typography gutterBottom variant="h6">
-                          {order.maker_nick}
-                        </Typography>
-                      </ListItemText>
-                    </ListItem>
-
-                    {/* CARD PARAGRAPH CONTENT */}
-                    <ListItemText>
-                      <Typography variant="subtitle1" color="text.secondary">
-                      ◑{order.type == 0 ? <b> Buys </b>: <b> Sells </b>} 
-                        <b>{parseFloat(parseFloat(order.amount).toFixed(4))}
-                        {" " +this.getCurrencyCode(order.currency)}</b> <a> worth of bitcoin</a> 
-                      </Typography>
-
-                      <Typography variant="subtitle1" color="text.secondary">
-                      ◑ Payment via <b>{order.payment_method}</b>
-                      </Typography>
-
-                      <Typography variant="subtitle1" color="text.secondary">
-                      ◑ Priced {order.is_explicit ? 
-                        " explicitly at " + this.pn(order.satoshis) + " Sats" : (
-                        " at " + 
-                        parseFloat(parseFloat(order.premium).toFixed(4)) + "% over the market"                     
-                        )}
-                      </Typography>
-
-                      <Typography variant="subtitle1" color="text.secondary">
-                      ◑ <b>{" 42,354 "}{this.getCurrencyCode(order.currency)}/BTC</b>  (Binance API)
-                      </Typography>
-                    </ListItemText>
-
-                  </List>
-
-                </CardContent>
-              </CardActionArea>
-            </Card>
-            </Grid>
-          )}
           <Grid item xs={12} align="center">
             <Typography component="h5" variant="h5">
               You are {this.state.type == 0 ? " selling " : " buying "} BTC for {this.state.currencyCode}
             </Typography>
           </Grid>
+          }
+
+        { this.state.not_found ?
+          (<Grid item xs={12} align="center">
+            <Grid item xs={12} align="center">
+              <Typography component="h5" variant="h5">
+                No orders found to {this.state.type == 0 ? ' sell ' :' buy ' } BTC for {this.state.currencyCode}
+              </Typography>
+            </Grid>
+            <Grid item>
+              <Button variant="contained" color='primary' to='/make/' component={Link}>Make Order</Button>
+            </Grid>
+              <Typography component="body1" variant="body1">
+                Be the first one to create an order
+              </Typography>
+          </Grid>)
+          : this.bookCards()
+          }
           <Grid item xs={12} align="center">
               <Button color="secondary" variant="contained" to="/" component={Link}>
                   Back

frontend/src/components/MakerPage.js

@@ -1,5 +1,5 @@
 import React, { Component } from 'react';
-import { Paper, Button , Grid, Typography, TextField, Select, FormHelperText, MenuItem, FormControl, Radio, FormControlLabel, RadioGroup, Menu} from "@material-ui/core"
+import { Paper, Alert, AlertTitle, Button , Grid, Typography, TextField, Select, FormHelperText, MenuItem, FormControl, Radio, FormControlLabel, RadioGroup, Menu} from "@material-ui/core"
 import { Link } from 'react-router-dom'
 
 function getCookie(name) {
@@ -91,7 +91,7 @@ export default class MakerPage extends Component {
         console.log(this.state)
         const requestOptions = {
             method: 'POST',
-            headers: {'Content-Type':'application/json', 'X-CSRFToken': csrftoken},
+            headers: {'Content-Type':'application/json', 'X-CSRFToken': getCookie('csrftoken')},
             body: JSON.stringify({
                 type: this.state.type,
                 currency: this.state.currency,
@@ -104,7 +104,8 @@ export default class MakerPage extends Component {
         };
         fetch("/api/make/",requestOptions)
         .then((response) => response.json())
-        .then((data) => (console.log(data) & this.props.history.push('/order/' + data.id)));
+        .then((data) => (this.setState({badRequest:data.bad_request})
+             & (data.id ? this.props.history.push('/order/' + data.id) :"")));
     }
 
   render() {
@@ -242,6 +243,13 @@ export default class MakerPage extends Component {
                 <Button color="primary" variant="contained" onClick={this.handleCreateOfferButtonPressed} >
                     Create Order
                 </Button>
+            </Grid>
+            <Grid item xs={12} align="center">
+                {this.state.badRequest ?
+                <Typography component="subtitle2" variant="subtitle2" color="secondary">
+                    {this.state.badRequest} <br/>
+                </Typography>
+                : ""}
                 <Typography component="subtitle2" variant="subtitle2">
                     <div align='center'>
                         Create a BTC {this.state.type==0 ? "buy":"sell"} order for {this.state.amount} {this.state.currencyCode} 

frontend/src/components/OrderPage.js

@@ -2,6 +2,34 @@ import React, { Component } from "react";
 import { Paper, Button , Grid, Typography, List, ListItem, ListItemText, ListItemAvatar, Avatar, Divider} from "@material-ui/core"
 import { Link } from 'react-router-dom'
 
+function msToTime(duration) {
+  var seconds = Math.floor((duration / 1000) % 60),
+    minutes = Math.floor((duration / (1000 * 60)) % 60),
+    hours = Math.floor((duration / (1000 * 60 * 60)) % 24);
+
+  minutes = (minutes < 10) ? "0" + minutes : minutes;
+  seconds = (seconds < 10) ? "0" + seconds : seconds;
+
+  return hours + "h " + minutes + "m " + seconds + "s";
+}
+
+function getCookie(name) {
+  let cookieValue = null;
+  if (document.cookie && document.cookie !== '') {
+      const cookies = document.cookie.split(';');
+      for (let i = 0; i < cookies.length; i++) {
+          const cookie = cookies[i].trim();
+          // Does this cookie string begin with the name we want?
+          if (cookie.substring(0, name.length + 1) === (name + '=')) {
+              cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
+              break;
+          }
+      }
+  }
+  return cookieValue;
+}
+const csrftoken = getCookie('csrftoken');
+
 // pretty numbers
 function pn(x) {
   return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
@@ -26,7 +54,7 @@ export default class OrderPage extends Component {
             statusText: data.status_message,
             type: data.type,
             currency: data.currency,
-            currencyCode: (data.currency== 1 ) ? "USD": ((data.currency == 2 ) ? "EUR":"ETH"),
+            currencyCode: this.getCurrencyCode(data.currency),
             amount: data.amount,
             paymentMethod: data.payment_method,
             isExplicit: data.is_explicit,
@@ -37,14 +65,39 @@ export default class OrderPage extends Component {
             makerNick: data.maker_nick,
             takerId: data.taker,
             takerNick: data.taker_nick,
+            isBuyer:data.buyer,
+            isSeller:data.seller,
+            expiresAt:data.expires_at,
+            badRequest:data.bad_request,
         });
       });
   }
 
+  // Gets currency code (3 letters) from numeric (e.g., 1 -> USD)
+  // Improve this function so currencies are read from json
+  getCurrencyCode(val){
+    return (val == 1 ) ? "USD": ((val == 2 ) ? "EUR":"ETH")
+  }
+
   // Fix to use proper react props
   handleClickBackButton=()=>{
     window.history.back();
   }
+
+  handleClickTakeOrderButton=()=>{
+    console.log(this.state)
+      const requestOptions = {
+          method: 'POST',
+          headers: {'Content-Type':'application/json', 'X-CSRFToken': getCookie('csrftoken'),},
+          body: JSON.stringify({
+            'action':'take',
+          }),
+      };
+      fetch('/api/order/' + '?order_id=' + this.orderId, requestOptions)
+      .then((response) => response.json())
+      .then((data) => (console.log(data) & this.getOrderDetails(data.id)));
+  }
+
   render (){
     return (
       <Grid container spacing={1}>
@@ -53,7 +106,7 @@ export default class OrderPage extends Component {
           BTC {this.state.type ? " Sell " : " Buy "} Order
           </Typography>
           <Paper elevation={12} style={{ padding: 8,}}>
-          <List component="nav" aria-label="mailbox folders">
+          <List dense="true">
             <ListItem >
               <ListItemAvatar sx={{ width: 56, height: 56 }}>
                 <Avatar 
@@ -61,9 +114,35 @@ export default class OrderPage extends Component {
                   src={window.location.origin +'/static/assets/avatars/' + this.state.makerNick + '.png'} 
                   />
               </ListItemAvatar>
-              <ListItemText primary={this.state.makerNick} secondary="Order maker" />
+              <ListItemText primary={this.state.makerNick} secondary="Order maker" align="right"/>
             </ListItem>
             <Divider />
+
+            {this.state.isParticipant ?
+              <>
+                {this.state.takerNick!='None' ?
+                  <>
+                    <ListItem align="left">
+                      <ListItemText primary={this.state.takerNick} secondary="Order taker"/>
+                      <ListItemAvatar > 
+                        <Avatar
+                          alt={this.state.makerNick} 
+                          src={window.location.origin +'/static/assets/avatars/' + this.state.takerNick + '.png'}
+                          />
+                      </ListItemAvatar>
+                    </ListItem>
+                    <Divider />               
+                  </>: 
+                  ""
+                  }
+                  <ListItem>
+                    <ListItemText primary={this.state.statusText} secondary="Order status"/>
+                  </ListItem>
+                  <Divider />
+              </>
+            :""
+            }
+            
             <ListItem>
               <ListItemText primary={parseFloat(parseFloat(this.state.amount).toFixed(4))+" "+this.state.currencyCode} secondary="Amount and currency requested"/>
             </ListItem>
@@ -80,32 +159,26 @@ export default class OrderPage extends Component {
             }
             </ListItem>
             <Divider />
-            {this.state.isParticipant ?
+
-              <>
-                <ListItem>
-                  <ListItemText primary={this.state.statusText} secondary="Order status"/>
-                </ListItem>
-              <Divider />
-              { this.state.takerNick!='None' ?
-                <><ListItem>
-                  <ListItemText primary={this.state.takerNick} secondary="Order taker"/>
-                </ListItem>
-              <Divider /> </>: ""}
-              </>
-            :""
-            }
             <ListItem>
               <ListItemText primary={'#'+this.orderId} secondary="Order ID"/>
             </ListItem>
+            <Divider />
+
+            <ListItem>
+              <ListItemText primary={msToTime( new Date(this.state.expiresAt) - Date.now())} secondary="Expires in "/>
+            </ListItem>
             </List>
 
-          <Grid item xs={12} align="center">
-          {this.state.isParticipant ? "" : <Button variant='contained' color='primary' to='/home' component={Link}>Take Order</Button>}
-          </Grid>
-          <Grid item xs={12} align="center">
-          {this.state.isParticipant ? "" : <Button variant='contained' color='secondary' onClick={this.handleClickBackButton}>Back</Button>}
-          </Grid>
           </Paper>
+
+          <Grid item xs={12} align="center">
+          {this.state.isParticipant ? "" : <Button variant='contained' color='primary' onClick={this.handleClickTakeOrderButton}>Take Order</Button>}
+          </Grid>
+          <Grid item xs={12} align="center">
+            <Button variant='contained' color='secondary' onClick={this.handleClickBackButton}>Back</Button>
+          </Grid>
+
         </Grid>
       </Grid>
     );

frontend/src/components/UserGenPage.js

@@ -58,7 +58,7 @@ export default class UserGenPage extends Component {
   delGeneratedUser() {
     const requestOptions = {
       method: 'DELETE',
-      headers: {'Content-Type':'application/json', 'X-CSRFToken': csrftoken},
+      headers: {'Content-Type':'application/json', 'X-CSRFToken': getCookie('csrftoken')},
     };
     fetch("/api/usergen", requestOptions)
       .then((response) => response.json())
@@ -74,7 +74,7 @@ export default class UserGenPage extends Component {
     this.setState({
       token: this.genBase62Token(32),
     })
-    this.getGeneratedUser();
+    this.reload_for_csrf_to_work();
   }
 
   handleChangeToken=(e)=>{

setup.md

@@ -4,7 +4,10 @@
 `sudo apt install python3 python3 pip`
 
 ### Install virtual environments
-`pip install virtualenvwrapper`
+```
+pip install virtualenvwrapper
+pip install python-decouple
+```
 
 ### Add to .bashrc
 
@@ -28,6 +31,9 @@ source /usr/local/bin/virtualenvwrapper.sh
 ### Install Django and Restframework
 `pip3 install django djangorestframework`
 
+## Install Django admin relational links
+`pip install django-admin-relation-links`
+
 *Django 4.0 at the time of writting*
 
 ### Launch the local development node