Create API endpoint for POST make order

Added the Order model with a rough approxiation to the fields needed. The field status can be read lineally as the progression trough the app pipeline. The view serves POSTs requests to enter new orders into the db.

.gitignore

@@ -635,3 +635,5 @@ MigrationBackup/
 # Fody - auto-generated XML schema
 FodyWeavers.xsd
 
+# Django
+*migrations*

api/models.py

@@ -1,3 +1,71 @@
 from django.db import models
+from django.contrib.auth.models import User
+from django.core.validators import MaxValueValidator, MinValueValidator
 
-# Create your models here.
+#############################
+# TODO
+# Load hparams from .env file
+
+min_satoshis_trade = 10*1000
+max_satoshis_trade = 500*1000
+
+class Order(models.Model):
+    
+    class Types(models.IntegerChoices):
+        BUY  = 0, 'BUY'
+        SELL = 1, 'SELL'
+
+    class Currencies(models.IntegerChoices):
+        USD = 1, 'USD'
+        EUR = 2, 'EUR'
+        ETH = 3, 'ETH'
+
+    class Status(models.TextChoices):
+        WFB = 0, 'Waiting for bond'
+        PUB = 1, 'Published in order book'
+        DEL = 2, 'Deleted from order book'
+        TAK = 3, 'Taken'
+        UCA = 4, 'Unilaterally cancelled'
+        RET = 5, 'Returned to order book' # Probably same as 1 in most cases.
+        WF2 = 6, 'Waiting for trade collateral and buyer invoice'
+        WTC = 7, 'Waiting only for trade collateral'
+        WBI = 8, 'Waiting only for buyer invoice'
+        EXF = 9, 'Exchanging fiat / In chat'
+        CCA = 10, 'Collaboratively cancelled'
+        FSE = 11, 'Fiat sent'
+        FCO = 12, 'Fiat confirmed'
+        SUC = 13, 'Sucessfully settled'
+        FAI = 14, 'Failed lightning network routing'
+        UPI = 15, 'Updated invoice'
+        DIS = 16, 'In dispute'
+        MLD = 17, 'Maker lost dispute'
+        TLD = 18, 'Taker lost dispute'
+        EXP = 19, 'Expired'
+
+    # order info, id = models.CharField(max_length=64, unique=True, null=False)
+    status = models.PositiveSmallIntegerField(choices=Status.choices, default=Status.WFB)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    # order details
+    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)])
+    premium = models.DecimalField(max_digits=3, decimal_places=2, default=0, null=True, validators=[MinValueValidator(-100), MaxValueValidator(1000)])
+    satoshis = models.PositiveBigIntegerField(null=True, validators=[MinValueValidator(min_satoshis_trade), MaxValueValidator(max_satoshis_trade)])
+    
+    # order participants
+    maker = models.ForeignKey(User, related_name='maker', on_delete=models.SET_NULL, 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
+    
+    # order collateral
+    has_maker_bond = models.BooleanField(default=False, null=False)
+    has_taker_bond = models.BooleanField(default=False, null=False)
+    has_trade_collat = models.BooleanField(default=False, null=False)
+
+    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
+    invoice = models.CharField(max_length=300, unique=False, null=True, default=None)

api/serializers.py

@@ -0,0 +1,12 @@
+from rest_framework import serializers
+from .models import Order
+
+class OrderSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Order
+        fields = ('id','status','created_at','type','currency','amount','premium','satoshis','maker')
+
+class MakeOrderSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Order
+        fields = ('type','currency','amount','premium','satoshis')

api/urls.py

@@ -0,0 +1,6 @@
+from django.urls import path
+from .views import MakeOrder
+
+urlpatterns = [
+    path('make/', MakeOrder.as_view())
+    ]

api/views.py

@@ -1,3 +1,40 @@
-from django.shortcuts import render
+from rest_framework import generics, status
+from rest_framework.views import APIView
+from rest_framework.response import Response
+
+from .serializers import OrderSerializer, MakeOrderSerializer
+from .models import Order
 
 # Create your views here.
+
+class MakeOrder(APIView):
+    serializer_class  = MakeOrderSerializer
+
+    def post(self,request, format=None):
+
+        serializer = self.serializer_class(data=request.data)
+        print(serializer)
+        if serializer.is_valid():
+            otype = serializer.data.get('type')
+            currency = serializer.data.get('currency')
+            amount = serializer.data.get('amount')
+            premium = serializer.data.get('premium')
+            satoshis = serializer.data.get('satoshis')
+
+            #################
+            # TODO
+            # query if the user is already a maker or taker, return error
+
+            # Creates a new order in db
+            order = Order(
+                type=otype,
+                currency=currency,
+                amount=amount,
+                premium=premium,
+                satoshis=satoshis)
+            order.save()
+
+        if not serializer.is_valid():
+            return Response(status=status.HTTP_400_BAD_REQUEST)
+            
+        return Response(OrderSerializer(order).data, status=status.HTTP_201_CREATED)

robosats/settings.py

@@ -37,6 +37,8 @@ INSTALLED_APPS = [
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles',
+    'rest_framework',
+    'api',
 ]
 
 MIDDLEWARE = [

robosats/urls.py

@@ -14,8 +14,9 @@ Including another URLconf
     2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
 """
 from django.contrib import admin
-from django.urls import path
+from django.urls import path, include
 
 urlpatterns = [
     path('admin/', admin.site.urls),
+    path('api/', include('api.urls')),
     ]