* refactor sale creation and url schema

* add `sale_cancelled` to ItemSale model
* add new tasks for closing completed and cancelled sales
* add `cancel_sale` url/view/logic

bids/views.py

@@ -160,7 +160,7 @@ def accept_bid(request, bid_id):
     )
     sale.save()
 
-    return HttpResponseRedirect(reverse('get_sale', args=[bid.id]))
+    return HttpResponseRedirect(reverse('get_sale', args=[sale.id]))
 
 @login_required
 def delete_bid(request, bid_id):

items/views.py

@@ -40,11 +40,13 @@ def get_item(request, item_id):
     item = Item.objects.get(id=item_id)
     item_images = item.images.all()
     item_bids = item.bids.all().order_by('-bid_price_xmr')
+    sale = ItemSale.objects.filter(bid__in=item_bids, sale_cancelled=False).first()
 
     context = {
         'item': item,
         'item_images': item_images,
-        'item_bids': item_bids
+        'item_bids': item_bids,
+        'sale': sale
     }
 
     return render(request, 'items/get_item.html', context)

sales/migrations/0003_itemsale_sale_cancelled.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.2.8 on 2020-01-10 22:00
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('sales', '0002_auto_20200107_0910'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='itemsale',
+            name='sale_cancelled',
+            field=models.BooleanField(default=False),
+        ),
+    ]

sales/models.py

@@ -30,6 +30,7 @@ class ItemSale(models.Model):
     seller_notified_of_payout = models.BooleanField(default=False)
     platform_paid = models.BooleanField(default=False)
     sale_finalized = models.BooleanField(default=False)
+    sale_cancelled = models.BooleanField(default=False)
 
     def __str__(self):
         return f"{self.id} - {self.item.name} - {self.bid.bidder} > {self.item.owner}"

sales/tasks.py

@@ -16,10 +16,7 @@ class EmailTemplate:
             'sale': item,
             'site_name': settings.SITE_NAME,
             'site_url': settings.SITE_URL,
-            'sale_path': reverse('get_sale', args=[item.bid.id]),
-            'shipping_address': UserShippingAddress.objects.filter(
-                user=item.bid.bidder
-            ).first()
+            'sale_path': reverse('get_sale', args=[item.id])
         }
         subject = render_to_string(
             template_name=f'sales/notify/{scenario}/{role}/subject.txt',
@@ -53,7 +50,7 @@ class EmailTemplate:
 
 @periodic_task(crontab(minute='*/3'))
 def notify_buyer_of_pending_sale():
-    item_sales = ItemSale.objects.filter(buyer_notified=False)
+    item_sales = ItemSale.objects.filter(buyer_notified=False, sale_cancelled=False)
     for sale in item_sales:
         email_template = EmailTemplate(
             item=sale,
@@ -157,7 +154,7 @@ def pay_sellers_on_sold_items():
             sale.seller_notified_of_payout = True
             sale.save()
 
-@periodic_task(crontab(hour='*/2'))
+@periodic_task(crontab(hour='*/3'))
 def pay_platform_on_sold_items():
     aw = AuctionWallet()
     if aw.connected is False:
@@ -208,4 +205,29 @@ def poll_for_buyer_escrow_payments():
                 sale.id, sale.received_payment_xmr, sale.payment_received
             ))
 
-# TODO - close out old sales
+@periodic_task(crontab(hour='*/8'))
+def close_completed_items_sales():
+    item_sales = ItemSale.objects.filter(platform_paid=True, sale_finalized=True)
+    for sale in item_sales:
+        print(f'deleting item #{sale.item.id} and all accompanying bids, sales, meta')
+        sale.item.delete()
+
+@periodic_task(crontab(minute='*/6'))
+def closed_cancelled_sales():
+    aw = AuctionWallet()
+    if aw.connected is False:
+        return False
+
+    item_sales = ItemSale.objects.filter(sale_cancelled=True)
+    for sale in item_sales:
+        print(f'deleting sale #{sale.id} and transferring back any sent funds to the buyer')
+        sale_account = aw.wallet.accounts[sale.escrow_account_index]
+        if sale_account.balance() > Decimal(0.0):
+            try:
+                sale_account.sweep_all(sale.bid.return_address)
+                sale.delete()
+            except Exception as e:
+                print('unable to sweep all: ', e)
+                return False
+        else:
+            sale.delete()

sales/urls.py

@@ -3,7 +3,8 @@ from . import views
 
 
 urlpatterns = [
-    path('<int:bid_id>/', views.get_sale, name='get_sale'),
+    path('<int:sale_id>/', views.get_sale, name='get_sale'),
+    path('<int:sale_id>/cancel', views.cancel_sale, name='cancel_sale'),
     path('<int:sale_id>/confirm_shipment/', views.confirm_shipment, name='confirm_shipment'),
     path('<int:sale_id>/confirm_receipt/', views.confirm_receipt, name='confirm_receipt')
 ]

sales/views.py

@@ -10,9 +10,9 @@ from sales.models import ItemSale
 
 
 @login_required
-def get_sale(request, bid_id):
-    bid = ItemBid.objects.get(id=bid_id)
-    sale = ItemSale.objects.get(bid=bid)
+def get_sale(request, sale_id):
+    sale = ItemSale.objects.get(id=sale_id)
+    bid = ItemBid.objects.get(id=sale.bid.id)
     qr_uri = 'monero:{}?tx_amount={}&tx_description="xmrauctions_sale_{}"'.format(
         sale.escrow_address, sale.expected_payment_xmr, sale.id
     )
@@ -22,6 +22,11 @@ def get_sale(request, bid_id):
         messages.error(request, "You can't view a sale you are not involved in.")
         return HttpResponseRedirect(reverse('home'))
 
+    # Do not proceed if sale is cancelled
+    if sale.sale_cancelled:
+        messages.error(request, 'That sale has been cancelled and is no longer available.')
+        return HttpResponseRedirect(reverse('get_item', args=[sale.item.id]))
+
     _address_qr = BytesIO()
     address_qr = qrcode_make(qr_uri).save(_address_qr)
 
@@ -35,6 +40,38 @@ def get_sale(request, bid_id):
 
     return render(request, 'sales/get_sale.html', context)
 
+@login_required
+def cancel_sale(request, sale_id):
+    sale = ItemSale.objects.filter(id=sale_id).first()
+    bid = ItemBid.objects.get(id=sale.bid.id)
+
+    if sale is None:
+        messages.error(request, "That sale doesn't exist.")
+        return HttpResponseRedirect(reverse('home'))
+
+    # Do not proceed unless current user is a buyer or seller
+    if request.user != sale.bid.bidder and request.user != sale.item.owner:
+        messages.error(request, "You can't view a sale you are not involved in.")
+        return HttpResponseRedirect(reverse('home'))
+
+    if sale.payment_received:
+        messages.error(request, "You can't cancel a sale which has already received funds.")
+        return HttpResponseRedirect(reverse('get_sale', args=[sale.bid.id]))
+
+    # Item becomes available
+    sale.item.available = True
+    sale.item.save()
+
+    # Bid becomes not accepted
+    sale.bid.accepted = False
+    sale.bid.save()
+
+    # Sale gets cancelled
+    sale.sale_cancelled = True
+    sale.save()
+    return HttpResponseRedirect(reverse('get_item', args=[sale.item.id]))
+
+
 @login_required
 def confirm_shipment(request, sale_id):
     sale = ItemSale.objects.get(id=sale_id)

web/templates/items/get_item.html

@@ -51,7 +51,7 @@
         <td>
           {% if bid.accepted %}
             {% if bid.bidder == request.user or bid.item.owner == request.user %}
-              <a href="{% url 'get_sale' bid.id %}" class="button alt">View Sale</a>
+              <a href="{% url 'get_sale' sale.id %}" class="button alt">View Sale</a>
             {% endif %}
           {% else %}
             {% if bid.bidder == request.user %}

web/templates/sales/get_sale.html

@@ -28,6 +28,9 @@
         <li><a href="https://www.monerujo.io/" target="_blank">Monerujo (Android)</a></li>
         <li><a href="https://mymonero.com/" target="_blank">MyMonero (Desktop, Web)</a></li>
       </ul>
+      <h2>Change your Mind?</h2>
+      <p>You can cancel the sale and reopen the item for bidding. Any funds sent will be transferred again to your return address.</p>
+      <p><a href="{% url 'cancel_sale' sale.id %}" class="button">Cancel Sale</a></p>
       </span>
       {% elif sale.payment_received and sale.item_shipped == False %}
       <p class="sale-info">Congratulations {{ sale.bid.bidder.username }},</p>
@@ -80,7 +83,6 @@
         We are waiting for the buyer to send funds to the escrow address.
         No action is needed from you at this time, but you will be notified you when there is.
       </p>
-      <p class="sale-info">Congratulations on the sale!</p>
       {% elif sale.payment_received and sale.item_shipped == False %}
       <p class="sale-info">Congratulations {{ sale.item.owner.username }},</p>
       <p class="sale-info">