def enter_transaction(request):
""" Respond to the "/admin/account/transaction" URL.
We let the user enter a transaction into the system.
"""
if request.method == "GET":
# We're displaying the form for the first time -> set up the default
# values.
err_msg = None
type = "P"
user_id = ""
associated_user_id = ""
suffix = ""
other_user_id = ""
other_associated_user_id = ""
other_suffix = ""
amount = ""
description = ""
elif request.method == "POST":
# Respond to the user submitting our form.
if request.POST.get("cancel") == "Cancel":
return HttpResponseRedirect(reverse("tahua.admin_interface." +
"views.main.main"))
err_msg = None # initially.
type = request.POST['type']
user_id = request.POST['user_id']
associated_user_id = request.POST['associated_user_id']
suffix = request.POST['suffix']
other_user_id = request.POST['other_user_id']
other_associated_user_id = request.POST['other_associated_user_id']
other_suffix = request.POST['other_suffix']
amount = request.POST['amount']
description = request.POST['description']
account_id = account_helper.make_account_id(user_id,
associated_user_id,
suffix)
if not account_helper.is_valid_account_id(account_id):
err_msg = "You must enter a valid account identifier."
if user_id not in ["", None]:
try:
user = User.objects.get(user_id=user_id)
except User.DoesNotExist:
err_msg = "There is no user with ID " + user_id
if associated_user_id not in ["", None]:
try:
user = User.objects.get(user_id=associated_user_id)
except User.DoesNotExist:
err_msg = "There is no user with ID " + associated_user_id
if err_msg == None:
try:
dec_amount = decimal.Decimal(amount)
except decimal.InvalidOperation:
err_msg = "Invalid amount."
if err_msg == None:
if type not in [Transaction.TYPE_DEPOSIT,
Transaction.TYPE_WITHDRAWAL,
Transaction.TYPE_PAYMENT,
Transaction.TYPE_REVERSAL,
Transaction.TYPE_ADJUSTMENT]:
err_msg = "Please select a valid transaction type."
if err_msg == None:
if type == Transaction.TYPE_PAYMENT:
other_account_id = \
account_helper.make_account_id(other_user_id,
other_associated_user_id,
other_suffix)
if not account_helper.is_valid_account_id(other_account_id):
err_msg = "You must enter a valid other account identifier."
# If the entered data was accepted, enter the transaction into the
# system.
if err_msg == None:
account = account_helper.get_or_create_account(account_id)
if type == Transaction.TYPE_PAYMENT:
other_account = \
account_helper.get_or_create_account(other_account_id)
else:
other_account = None
meta_data = {}
if description != "":
meta_data['description'] = description
if type == Transaction.TYPE_PAYMENT:
dec_amount = -dec_amount # Deduct amount from source account.
transaction = Transaction()
transaction.account = account
transaction.other_account = other_account
transaction.timestamp = datetime.datetime.now()
transaction.type = type
transaction.amount = dec_amount
transaction.metadata = json.dumps(meta_data)
transaction.save()
# If the user is entering a payment, enter the reverse transaction
# at the same time.
if type == Transaction.TYPE_PAYMENT:
transaction = Transaction()
transaction.account = other_account
transaction.other_account = account
transaction.timestamp = datetime.datetime.now()
transaction.type = type
transaction.amount = -dec_amount
transaction.metadata = json.dumps(meta_data)
transaction.save()
# Finally, tell the user about the entered transaction.
if type == Transaction.TYPE_PAYMENT:
msg = utils.formatDecimalAsMoney(-dec_amount) \
+ " has been transferred from " + account.describe() \
+ " to " + other_account.describe() + "."
else:
msg = 'A transaction of type "' + transaction.type_to_string() \
+ '" to the value of ' \
+ utils.formatDecimalAsMoney(dec_amount) \
+ ' has been entered against the ' \
+ account.describe()
return render_to_response("admin_interface/" +
"transaction_entered.html",
{'msg' : msg},
context_instance=RequestContext(request))
# If we get here, display the form to the user.
return render_to_response("admin_interface/enter_transaction.html",
{'err_msg' : err_msg,
'type' : type,
'user_id' : user_id,
'associated_user_id' : associated_user_id,
'suffix' : suffix,
'other_user_id' : other_user_id,
'other_associated_user_id' :
other_associated_user_id,
'other_suffix' : other_suffix,
'amount' : amount,
'description' : description},
context_instance=RequestContext(request))
def pay(request):
""" Respond to the "/pay" API call.
"""
try:
# Extract our payload from the request parameters.
request_payload = api_helper.process_request(request)
if "error" in request_payload:
return request_payload["error"]
# Check that the required fields have all been supplied.
error = api_helper.check_fields(
request_payload,
required_fields=["session_key", "from_account_id", "to_account_id", "amount"],
optional_fields=["pin_number", "meta_data"],
)
if error != None:
return error
# Get the values we need from the payload.
session = request_payload["session"]
from_account_id = request_payload["fields"]["from_account_id"]
to_account_id = request_payload["fields"]["to_account_id"]
amount = decimal.Decimal(request_payload["fields"]["amount"])
pin_number = request_payload["fields"].get("pin_number")
meta_data = request_payload["fields"].get("meta_data")
# If the "to" account refers to a user alias, call the user alias
# resolver to translate from the user alias to the underlying user ID.
if isinstance(to_account_id, dict):
if "user_alias" in to_account_id:
user_id = alias_resolver.resolve(to_account_id["user_alias"])
if user_id == None:
return api_helper.error(request_payload, api_errors.UNKNOWN_ACCOUNT_ALIAS)
to_account_id["user_id"] = user_id
del to_account_id["user_alias"]
# Check that the "from" and "to" accounts are both valid.
if not account_helper.is_valid_account_id(from_account_id):
return api_helper.error(request_payload, api_errors.INVALID_ACCOUNT_ID)
if not account_helper.is_valid_account_id(to_account_id):
return api_helper.error(request_payload, api_errors.INVALID_ACCOUNT_ID)
# Make sure the user is allowed to access the "from" account.
if session.user.user_id != from_account_id.get("user_id"):
return api_helper.error(request_payload, api_errors.UNAUTHORIZED)
# If this transaction requires a PIN number, ensure that the correct
# PIN has been supplied.
max_payment_without_pin = account_helper.get_account_policy(from_account_id, "max_payment_without_pin")
if max_payment_without_pin != None:
if amount >= max_payment_without_pin:
# We need a PIN number for this payment -> check that the
# correct PIN has been supplied.
if pin_number == None:
return api_helper.error(request_payload, api_errors.PIN_NUMBER_REQUIRED)
if pin_number != session.user.pin_number:
return api_helper.error(request_payload, api_errors.INVALID_PIN_NUMBER)
# Check that the amount isn't too high, or doesn't exceed the daily
# transaction limit...eventually.
# Check that the account has enough funds to cover the desired
# transaction.
min_account_balance = account_helper.get_account_policy(from_account_id, "min_account_balance")
if min_account_balance == None:
min_account_balance = decimal.Decimal("0.00")
account_balance = account_helper.get_account_balance(from_account_id)
if account_balance - amount < min_account_balance:
return api_helper.error(request_payload, api_errors.INSUFFICIENT_FUNDS)
# If necessary, create the Account record(s) for the from and to
# accounts.
from_account = account_helper.get_or_create_account(from_account_id)
to_account = account_helper.get_or_create_account(to_account_id)
# If we get here, we're ready to make this payment. Create appropriate
# Transaction records to transfer the funds from one account to the
# other.
timestamp = datetime.datetime.now()
transaction = Transaction()
transaction.account = from_account
transaction.other_account = to_account
transaction.timestamp = timestamp
transaction.type = Transaction.TYPE_PAYMENT
transaction.amount = -amount
transaction.set_metadata(meta_data)
transaction.save()
transaction = Transaction()
transaction.account = to_account
transaction.other_account = from_account
transaction.timestamp = timestamp
transaction.type = Transaction.TYPE_PAYMENT
transaction.amount = amount
transaction.set_metadata(meta_data)
transaction.save()
# Update the 'update_id' values for both accounts, so that the various
# clients will know that the accounts have been updated.
account_helper.increment_update_id(from_account.id)
account_helper.increment_update_id(to_account.id)
# Finally, return an empty response payload back to the caller. We
# return an empty response (as opposed to an error response) when the
# payment was successful.
response_payload = {}
return api_helper.response(request_payload, response_payload)
except:
traceback.print_exc()
return HttpResponseServerError()