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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 os
import base64
import logging
import json
from urllib.parse import urljoin
import flask
import requests
from ..talerconfig import TalerConfig
from .amount import Amount
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 env(name, default=None):
return os.environ.get(name, default)
return dict(url=url, env=env)
def err_abort(abort_status_code, **params):
t = flask.render_template("templates/error.html", **params)
flask.abort(flask.make_response(t, abort_status_code))
def backend_post(endpoint, json):
try:
resp = requests.post(urljoin(BACKEND_URL, endpoint), json=json)
except requests.ConnectionError:
err_abort(500, message="Could not establish connection to backend")
try:
response_json = resp.json()
except ValueError:
err_abort(500, message="Could not parse response from backend",
status_code=resp.status_code)
if resp.status_code != 200:
err_abort(500, message="Backend returned error status",
json=response_json, status_code=resp.status_code)
return response_json
@app.errorhandler(Exception)
def internal_error(e):
return flask.render_template("templates/error.html",
message="Internal error",
stack=traceback.format_exc())
@app.route("/submit-survey", methods=["POST"])
def submit_survey():
tip_spec = dict(pickup_url=urljoin(flask.request.base_url, "/tip-pickup"),
amount=CURRENCY + ":1.0",
next_url=os.environ.get("TALER_ENV_URL_INTRO", "https://taler.net/"),
instance="default",
justification="Payment methods survey")
resp = backend_post("tip-authorize", tip_spec)
if resp.get("tip_redirect_url"):
flask.redirect(resp["tip_redirect_url"]
err_abort(500, message="Tipping failed, unexpected backend response",
json=resp)
@app.route("/", methods=["GET"])
def survey():
return flask.render_template("templates/index.html", merchant_currency=CURRENCY)
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