compute item amount from payload and its optional extra attribute (#9174)

README

@@ -19,3 +19,24 @@ details.
 
 You should have received a copy of the GNU Affero General Public License along
 with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+API
+---
+
+Items amount can be added to basket through API by posting to
+*/api/lingo/add-basket-item* endpoint a json payload containing *amount* and/or
+*"extra": {"amount": ...}* attribute.
+
+For example:
+
+    {"display_name": "<item display name>",
+     "url": "http://<item url>",
+     "amount": "42.42",
+     "extra": {"amount": "10.42", ...},
+     ...
+    }
+
+The "amount" attribute should be float or decimal or a list of
+floats/decimals. For example:
+
+    {"amount": [14.12], "extra": {"amount": ["10.42", "5", "10"], ... }, ...}

lingo/views.py

@@ -14,7 +14,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from decimal import Decimal
+from decimal import Decimal, ROUND_HALF_UP
 import json
 
 from django.contrib.auth.models import User
@@ -55,13 +55,26 @@ class AddBasketItemApiView(View):
     def dispatch(self, *args, **kwargs):
         return super(AddBasketItemApiView, self).dispatch(*args, **kwargs)
 
+    def get_amount(self, amount):
+        if isinstance(amount, list):
+            d = sum([Decimal(a) for a in amount])
+        else:
+            d = Decimal(amount)
+        return d.quantize(Decimal('0.01'), ROUND_HALF_UP)
+
     def post(self, request, *args, **kwargs):
         # XXX: check request signature
 
         request_body = json.loads(self.request.body)
+        extra = request_body.get('extra', {})
 
-        item = BasketItem()
-        item.amount = sum([Decimal(x) for x in request.GET.getlist('amount')])
+        item = BasketItem(amount=0)
+
+        if request_body.get('amount'):
+            item.amount += self.get_amount(request_body['amount'])
+
+        if extra.get('amount'):
+            item.amount += self.get_amount(extra['amount'])
 
         try:
             if request.GET.get('NameId'):

tests/test_payment.py

@@ -2,6 +2,7 @@ import pytest
 from datetime import datetime, timedelta
 import urlparse
 from decimal import Decimal
+import json
 
 from django.contrib.auth.models import User
 from django.core.urlresolvers import reverse
@@ -80,3 +81,28 @@ def test_successfull_items_payment(regie, user):
     # simulate backend callback call
     resp = client.get(qs['return_url'][0], args)
     assert resp.status_code == 200
+
+def test_add_amount_to_basket(regie, user):
+    user_email = 'foo@example.com'
+    User.objects.get_or_create(email=user_email)
+    amount = 42
+    data = {'amount': amount, 'display_name': 'test amount',
+            'url': 'http://example.com'}
+    url = '%s?email=%s' % (reverse('api-add-basket-item'), user_email)
+    resp = client.post(url, json.dumps(data), content_type='application/json')
+    assert resp.status_code == 200
+    assert json.loads(resp.content) == {'result': 'success'}
+    assert BasketItem.objects.filter(amount=amount).exists()
+
+    data['extra'] = {'amount': '22.22'}
+    resp = client.post(url, json.dumps(data), content_type='application/json')
+    assert resp.status_code == 200
+    assert json.loads(resp.content) == {'result': 'success'}
+    assert BasketItem.objects.filter(amount=Decimal('64.22')).exists()
+
+    data['amount'] = [amount]
+    data['extra'] = {'amount': ['22.22', '12']}
+    resp = client.post(url, json.dumps(data), content_type='application/json')
+    assert resp.status_code == 200
+    assert json.loads(resp.content) == {'result': 'success'}
+    assert BasketItem.objects.filter(amount=Decimal('76.22')).exists()