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# This file is part of GNU TALER.
# Copyright (C) 2017 Taler Systems SA
#
# TALER is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free Software
# Foundation; either version 2.1, or (at your option) any later version.
#
# TALER is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License along with
# GNU TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
#
# @author Marcello Stanisci
import flask
import os
import base64
import requests
import logging
from .amount import Amount
from talersurvey.talerconfig import TalerConfig
from urllib.parse import urljoin
base_dir = os.path.dirname(os.path.abspath(__file__))
app = flask.Flask(__name__, template_folder=base_dir)
app.debug = True
app.secret_key = base64.b64encode(os.urandom(64)).decode('utf-8')
tc = TalerConfig.from_env()
BACKEND_URL = tc["frontends"]["backend"].value_string(required=True)
CURRENCY = tc["taler"]["currency"].value_string(required=True)
app.config.from_object(__name__)
logger = logging.getLogger(__name__)
def backend_error(requests_response):
logger.error("Backend error: status code: "
+ str(requests_response.status_code))
try:
return flask.jsonify(requests_response.json()), requests_response.status_code
except json.decoder.JSONDecodeError:
logger.error("Backend error (NO JSON returned): status code: "
+ str(requests_response.status_code))
return flask.jsonify(dict(error="Backend died, no JSON got from it")), 502
@app.context_processor
def utility_processor():
def join_urlparts(*parts):
s = ""
i = 0
while i < len(parts):
n = parts[i]
i += 1
if s.endswith("/"):
n = n.lstrip("/")
elif s and not n.startswith("/"):
n = "/" + n
s += n
return s
def url(my_url):
return join_urlparts(flask.request.script_root, my_url)
def env(name, default=None):
return os.environ.get(name, default)
return dict(url=url, env=env)
@app.route("/pick", methods=["POST"])
def pick():
body = flask.request.get_json()
# Let the backend complain!
body["tip_id"] = flask.request.args.get("tip_id")
r = requests.post(urljoin(BACKEND_URL, 'tip-pickup'),
json=body)
if 200 != r.status_code:
return backend_error(r)
else:
return flask.jsonify(r.json())
@app.route("/", methods=["GET", "POST"])
def survey():
if flask.request.method == "GET":
return flask.render_template("templates/index.html", merchant_currency=CURRENCY)
success = False
amount = Amount(CURRENCY, 1)
if flask.request.method == "POST":
r = requests.post(urljoin(BACKEND_URL, 'tip-authorize'),
json=dict(amount=amount.dump(),
instance="default",
justification="Payment methods survey"))
if 200 != r.status_code:
return backend_error(r)
else:
success = True
response = flask.make_response(flask.render_template("templates/index.html", success=success), 402)
response.headers["X-Taler-Tipping-Url"] = urljoin(
flask.request.base_url,
flask.url_for("pick", tip_id=r.json().get("tip_id")))
response.headers["X-Taler-Tipping-Exchange"] = r.json().get("exchange_uri")
response.headers["X-Taler-Tipping-Amount"] = amount.stringify(2)
response.headers["X-Taler-Tipping-Deadline"] = r.json().get("expiration")
return response
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