Add placeholder for writing credit cards

minigrid/device_interface.py

@@ -46,3 +46,44 @@ def write_customer_card(minigrid_id, customer):
     print(block_5.hex())
     print(block_6.hex())
     print('=' * 60)
+
+
+def write_credit_card(minigrid_id, credit_amount, day_tariff, night_tariff):
+    """Write information to a credit card."""
+    block_4 = _wrap_binary(b''.join((
+        b'C',  # C for credit
+        b'\1',  # 1 for int
+        credit_amount.to_bytes(4, 'big'),  # 4 byte unsigned int
+        int(time.time()).to_bytes(4, 'big'),  # card produced time
+        bytes(2),  # intentionally empty
+        bytes(4),  # card read time TODO
+    )))
+    block_5 = _wrap_binary(uuid.uuid4().bytes)
+    block_6 = _wrap_binary(uuid.UUID(minigrid_id).bytes)
+    block_8 = _wrap_binary(b''.join((
+        b'\1',  # 1 for int
+        bytes(4),  # tariff 1 validate time??? TODO
+        (int(day_tariff * 100)).to_bytes(4, 'big'),  # day tariff in cents
+        bytes(7),  # intentionally empty
+    )))
+    block_9 = _wrap_binary(b''.join((
+        b'\1',  # 1 for int
+        bytes(4),  # tariff 2 validate time??? TODO
+        (int(night_tariff * 100)).to_bytes(4, 'big'),  # night tariff in cents
+        bytes(7),  # intentionally empty
+    )))
+    block_10 = _wrap_binary(b''.join((
+        bytes(4),  # time of these 2 tariff was created??? TODO
+        bytes(4),  # time to start use tariff??? TODO
+        bytes(8),  # intentionally empty
+    )))
+
+    # TODO write to device
+    print('=' * 60)
+    print(block_4.hex())
+    print(block_5.hex())
+    print(block_6.hex())
+    print(block_8.hex())
+    print(block_9.hex())
+    print(block_10.hex())
+    print('=' * 60)

minigrid/handlers.py

@@ -13,7 +13,8 @@
 
 import tornado.web
 
-from minigrid.device_interface import write_vendor_card, write_customer_card
+from minigrid.device_interface import (
+    write_vendor_card, write_customer_card, write_credit_card)
 import minigrid.error
 import minigrid.models as models
 from minigrid.options import options
@@ -250,7 +251,6 @@ def get(self, minigrid_id):
             minigrid=models.get_minigrid(self.session, minigrid_id))
 
 
-# TODO: this button should do something
 class MinigridWriteCreditHandler(BaseHandler):
     """Handlers for writing credit cards view."""
 
@@ -261,6 +261,21 @@ def get(self, minigrid_id):
             'minigrid_write_credit.html',
             minigrid=models.get_minigrid(self.session, minigrid_id))
 
+    @tornado.web.authenticated
+    def post(self, minigrid_id):
+        """Write a credit card for this minigrid."""
+        minigrid = models.get_minigrid(self.session, minigrid_id)
+        system = self.session.query(models.System).one()
+        write_credit_card(
+            minigrid_id,
+            int(self.get_argument('credit_value')),
+            system.day_tariff,
+            system.night_tariff,
+        )
+        message = 'Card written'
+        self.render(
+            'minigrid_write_credit.html', minigrid=minigrid, message=message)
+
 
 class MinigridVendorsHandler(BaseHandler):
     """Handlers for vendors view."""

minigrid/templates/minigrid_write_credit.html

@@ -7,8 +7,9 @@
   <h1>Minigrid Name: {{ minigrid.minigrid_name }}</h1>
   <p>ID: {{ minigrid.minigrid_id }}</p>
   <p>Write credit card:</p>
-  <form>
+  <form action="/minigrids/{{ minigrid.minigrid_id }}/write_credit" method="POST">
     {% module xsrf_form_html() %}
+    <label>Card value: <input type="number" step="1" min="0" name="credit_value" required /></label><br>
     <input type="submit" value="Write credit card" />
   </form>
   <footer>