def interactive_withdraw(request: Request) -> Response:
"""
"""
transaction_id = request.GET.get("transaction_id")
asset_code = request.GET.get("asset_code")
asset = Asset.objects.filter(code=asset_code).first()
if not transaction_id:
return render_error_response("no 'transaction_id' provided",
content_type="text/html")
elif not (asset_code and asset):
return render_error_response("invalid 'asset_code'",
content_type="text/html")
try:
transaction = Transaction.objects.get(id=transaction_id, asset=asset)
except (Transaction.DoesNotExist, ValidationError):
return render_error_response(
"Transaction with ID and asset_code not found",
content_type="text/html",
status_code=status.HTTP_404_NOT_FOUND,
)
if request.method == "GET":
form_class = rwi.form_for_transaction(transaction)
return Response({"form": form_class()},
template_name="withdraw/form.html")
# request.method == "POST"
form = rwi.form_for_transaction(transaction)(request.POST)
is_transaction_form = issubclass(form.__class__, TransactionForm)
if is_transaction_form:
form.asset = asset
if form.is_valid():
if is_transaction_form:
transaction.amount_in = form.cleaned_data["amount"]
transaction.amount_fee = calc_fee(asset,
settings.OPERATION_WITHDRAWAL,
transaction.amount_in)
transaction.save()
# Perform any defined post-validation logic defined by Polaris users
rwi.after_form_validation(form, transaction)
# Check to see if there is another form to render
form_class = rwi.form_for_transaction(transaction)
if form_class:
return Response({"form": form_class()},
template_name="withdraw/form.html")
else: # Last form has been submitted
invalidate_session(request)
transaction.status = Transaction.STATUS.pending_user_transfer_start
transaction.save()
url, args = reverse("more_info"), urlencode({"id": transaction_id})
return redirect(f"{url}?{args}")
else:
return Response({"form": form}, template_name="withdraw/form.html")
def post_interactive_withdraw(request: Request) -> Response:
"""
"""
transaction, asset, error_resp = interactive_args_validation(request)
if error_resp:
return error_resp
form = rwi.form_for_transaction(transaction)(request.POST)
is_transaction_form = issubclass(form.__class__, TransactionForm)
if is_transaction_form:
form.asset = asset
if form.is_valid():
if is_transaction_form:
transaction.amount_in = form.cleaned_data["amount"]
transaction.amount_fee = calc_fee(asset,
settings.OPERATION_WITHDRAWAL,
transaction.amount_in)
transaction.save()
# Perform any defined post-validation logic defined by Polaris users
rwi.after_form_validation(form, transaction)
# Check to see if there is another form to render
form_class = rwi.form_for_transaction(transaction)
if form_class:
args = {"transaction_id": transaction.id, "asset_code": asset.code}
url = reverse("get_interactive_withdraw")
return redirect(f"{url}?{urlencode(args)}")
else: # Last form has been submitted
invalidate_session(request)
transaction.status = Transaction.STATUS.pending_user_transfer_start
transaction.save()
url, args = reverse("more_info"), urlencode({"id": transaction.id})
return redirect(f"{url}?{args}")
else:
return Response({"form": form}, template_name="withdraw/form.html")
def post_interactive_withdraw(request: Request) -> Response:
"""
POST /transactions/withdraw/webapp
This endpoint processes form submissions during the withdraw interactive
flow. The following steps are taken during this process:
1. URL arguments are parsed and validated.
2. form_for_transaction() is called to retrieve the form used to
submit this request. This function is implemented by the anchor.
3. The form is used to validate the data submitted, and if the form
is a TransactionForm, the fee for the transaction is calculated.
4. after_form_validation() is called to allow the anchor to process
the data submitted. This function should change the application
state such that the next call to form_for_transaction() returns
the next form in the flow.
5. form_for_transaction() is called again to retrieve the next
form to be served to the user. If a form is returned, the
function redirects to GET /transaction/withdraw/webapp. Otherwise,
The user's session is invalidated, the transaction status is
updated, and the function redirects to GET /more_info.
"""
args_or_error = interactive_args_validation(request)
if "error" in args_or_error:
return args_or_error["error"]
transaction = args_or_error["transaction"]
asset = args_or_error["asset"]
callback = args_or_error["callback"]
amount = args_or_error["amount"]
form = rwi.form_for_transaction(transaction, post_data=request.data)
if not form:
logger.error("Initial form_for_transaction() call returned None "
f"for {transaction.id}")
if transaction.status != transaction.STATUS.incomplete:
return render_error_response(
_("The anchor did not provide content, is the interactive flow already complete?"
),
status_code=422,
content_type="text/html",
)
return render_error_response(
_("The anchor did not provide content, unable to serve page."),
status_code=500,
content_type="text/html",
)
if not form.is_bound:
# The anchor must initialize the form with request.data
logger.error(
"form returned was not initialized with POST data, returning 500")
return render_error_response(
_("Unable to validate form submission."),
status_code=500,
content_type="text/html",
)
elif form.is_valid():
if issubclass(form.__class__, TransactionForm):
transaction.amount_in = form.cleaned_data["amount"]
transaction.save()
rwi.after_form_validation(form, transaction)
next_form = rwi.form_for_transaction(transaction)
if next_form or rwi.content_for_template(
Template.WITHDRAW, form=next_form, transaction=transaction):
args = {"transaction_id": transaction.id, "asset_code": asset.code}
if amount:
args["amount"] = amount
if callback:
args["callback"] = callback
url = reverse("get_interactive_withdraw")
return redirect(f"{url}?{urlencode(args)}")
else: # Last form has been submitted
logger.info(
f"Finished data collection and processing for transaction {transaction.id}"
)
invalidate_session(request)
# Add memo now that interactive flow is complete
#
# We use the transaction ID as a memo on the Stellar transaction for the
# payment in the withdrawal. This lets us identify that as uniquely
# corresponding to this `Transaction` in the database. But a UUID4 is a 32
# character hex string, while the Stellar HashMemo requires a 64 character
# hex-encoded (32 byte) string. So, we zero-pad the ID to create an
# appropriately sized string for the `HashMemo`.
transaction_id_hex = transaction.id.hex
padded_hex_memo = "0" * (
64 - len(transaction_id_hex)) + transaction_id_hex
transaction.memo = memo_hex_to_base64(padded_hex_memo)
# Update status
# This signals to the wallet that the transaction can be submitted
transaction.status = Transaction.STATUS.pending_user_transfer_start
transaction.save()
url = reverse("more_info")
args = urlencode({"id": transaction.id, "callback": callback})
return redirect(f"{url}?{args}")
else:
content = (rwi.content_for_template(
Template.WITHDRAW, form=form, transaction=transaction) or {})
if registered_scripts_func is not scripts:
logger.warning(
"DEPRECATED: the `scripts` Polaris integration function will be "
"removed in Polaris 2.0 in favor of allowing the anchor to override "
"and extend Polaris' Django templates. See the Template Extensions "
"documentation for more information.")
template_scripts = registered_scripts_func({"form": form, **content})
url_args = {"transaction_id": transaction.id, "asset_code": asset.code}
if callback:
url_args["callback"] = callback
if amount:
url_args["amount"] = amount
toml_data = registered_toml_func()
post_url = f"{reverse('post_interactive_withdraw')}?{urlencode(url_args)}"
get_url = f"{reverse('get_interactive_withdraw')}?{urlencode(url_args)}"
content.update(
form=form,
post_url=post_url,
get_url=get_url,
scripts=template_scripts,
operation=settings.OPERATION_WITHDRAWAL,
asset=asset,
use_fee_endpoint=registered_fee_func != calculate_fee,
org_logo_url=toml_data.get("DOCUMENTATION", {}).get("ORG_LOGO"),
)
return Response(content,
template_name="polaris/withdraw.html",
status=422)
def post_interactive_withdraw(request: Request) -> Response:
"""
POST /transactions/withdraw/webapp
This endpoint processes form submissions during the withdraw interactive
flow. The following steps are taken during this process:
1. URL arguments are parsed and validated.
2. content_for_transaction() is called to retrieve the form used to
submit this request. This function is implemented by the anchor.
3. The form is used to validate the data submitted, and if the form
is a TransactionForm, the fee for the transaction is calculated.
4. after_form_validation() is called to allow the anchor to process
the data submitted. This function should change the application
state such that the next call to content_for_transaction() returns
the next form in the flow.
5. content_for_transaction() is called again to retrieve the next
form to be served to the user. If a form is returned, the
function redirects to GET /transaction/deposit/webapp. Otherwise,
The user's session is invalidated, the transaction status is
updated, and the function redirects to GET /more_info.
"""
args_or_error = interactive_args_validation(request)
if "error" in args_or_error:
return args_or_error["error"]
transaction = args_or_error["transaction"]
asset = args_or_error["asset"]
callback = args_or_error["callback"]
amount = args_or_error["amount"]
content = rwi.content_for_transaction(transaction)
if not (content and content.get("form")):
logger.error(
"Initial content_for_transaction() call returned None "
f"for {transaction.id}"
)
return render_error_response(
_("The anchor did not provide a content, unable to serve page."),
status_code=500,
content_type="text/html",
)
form_class = content.get("form")
form = form_class(request.POST)
is_transaction_form = issubclass(form_class, TransactionForm)
if is_transaction_form:
form.asset = asset
if form.is_valid():
if is_transaction_form:
fee_params = {
"operation": settings.OPERATION_WITHDRAWAL,
"asset_code": asset.code,
**form.cleaned_data,
}
transaction.amount_in = form.cleaned_data["amount"]
transaction.amount_fee = registered_fee_func(fee_params)
transaction.save()
rwi.after_form_validation(form, transaction)
content = rwi.content_for_transaction(transaction)
if content:
args = {"transaction_id": transaction.id, "asset_code": asset.code}
if amount:
args["amount"] = amount
if callback:
args["callback"] = callback
url = reverse("get_interactive_withdraw")
return redirect(f"{url}?{urlencode(args)}")
else: # Last form has been submitted
logger.info(
f"Finished data collection and processing for transaction {transaction.id}"
)
invalidate_session(request)
transaction.status = Transaction.STATUS.pending_user_transfer_start
transaction.save()
url = reverse("more_info")
args = urlencode({"id": transaction.id, "callback": callback})
return redirect(f"{url}?{args}")
else:
content.update(form=form)
return Response(content, template_name="withdraw/form.html")