Add cronjob for monthly donations

cronjob.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+from fosspay.objects import *
+from fosspay.database import db
+from fosspay.config import _cfg
+from fosspay.email import send_thank_you, send_declined
+
+from datetime import datetime, timedelta
+
+import stripe
+
+stripe.api_key = _cfg("stripe-secret")
+
+print("Processing monthly donations")
+
+donations = Donation.query \
+    .filter(Donation.type == DonationType.monthly) \
+    .filter(Donation.active) \
+    .all()
+
+limit = datetime.now() - timedelta(days=30)
+
+for donation in donations:
+    if donation.updated < limit:
+        print("Charging {}".format(donation))
+        user = donation.user
+        customer = stripe.Customer.retrieve(user.stripe_customer)
+        try:
+            charge = stripe.Charge.create(
+                amount=donation.amount,
+                currency="usd",
+                customer=user.stripe_customer,
+                description="Donation to " + _cfg("your-name")
+            )
+        except stripe.error.CardError as e:
+            donation.active = False
+            db.commit()
+            send_declined(user, donation.amount)
+            print("Declined")
+            continue
+
+        send_thank_you(user, donation.amount, donation.type == DonationType.monthly)
+        donation.updated = datetime.now()
+        db.commit()
+    else:
+        print("Skipping {}".format(donation))
+
+print("Done. {} records processed.".format(len(donations)))

emails/declined

@@ -0,0 +1,12 @@
+An attempt was just made to charge your card for your monthly donation to
+{{your_name}} for ${{amount}}. Unfortunately, your card was declined.
+
+The donation has been disabled. If you would like to, you may create a new
+recurring donation here:
+
+{{root}}
+
+Thanks!
+
+--
+{{your_name}}

fosspay/email.py

@@ -51,3 +51,23 @@ def send_password_reset(user):
     message['To'] = user.email
     smtp.sendmail(_cfg("smtp-from"), [ user.email ], message.as_string())
     smtp.quit()
+
+def send_declined(user, amount):
+    if _cfg("smtp-host") == "":
+        return
+    smtp = smtplib.SMTP(_cfg("smtp-host"), _cfgi("smtp-port"))
+    smtp.login(_cfg("smtp-user"), _cfg("smtp-password"))
+    with open("emails/declined") as f:
+        message = MIMEText(html.parser.HTMLParser().unescape(\
+            pystache.render(f.read(), {
+                "user": user,
+                "root": _cfg("protocol") + "://" + _cfg("domain"),
+                "your_name": _cfg("your-name"),
+                "amount": "{:.2f}".format(amount / 100)
+            })))
+    message['X-MC-PreserveRecipients'] = "false"
+    message['Subject'] = "Your monthly donation was declined."
+    message['From'] = _cfg("smtp-from")
+    message['To'] = user.email
+    smtp.sendmail(_cfg("smtp-from"), [ user.email ], message.as_string())
+    smtp.quit()