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@app.route("/donate")
def donate():
donation_amount = expect_parameter("donation_amount")
donation_donor = expect_parameter("donation_donor")
fulfillment_url = flask.url_for("fulfillment", _external=True)
order = dict(
amount=donation_amount,
extra=dict(donor=donation_donor, amount=donation_amount),
fulfillment_url=fulfillment_url,
summary="Donation to the GNU Taler project",
)
# ask backend to create new order
order_resp = backend_post("order", dict(order=order))
order_id = order_resp["order_id"]
return flask.redirect(flask.url_for("fulfillment", order_id=order_id))
@app.route("/receipt")
def fulfillment():
order_id = expect_parameter("order_id")
pay_params = dict(order_id=order_id)
# ask backend for status of payment
pay_status = backend_get("check-payment", pay_params)
if pay_status.get("payment_redirect_url"):
return flask.redirect(pay_status["payment_redirect_url"])
if pay_status.get("paid"):
# The "extra" field in the contract terms can be used
# by the merchant for free-form data, interpreted
# by the merchant (avoids additional database access)
extra = pay_status["contract_terms"]["extra"]
return flask.render_template(
"templates/fulfillment.html",
donation_amount=extra["amount"],
donation_donor=extra["donor"],
order_id=order_id,
currency=CURRENCY)
# no pay_redirect but article not paid, this should never happen!
err_abort(500, message="Internal error, invariant failed", json=pay_status)
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