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# This file is part of TALER
# (C) 2016 INRIA
#
# TALER is free software; you can redistribute it and/or modify it under the
# terms of the GNU Affero General Public License as published by the Free Software
# Foundation; either version 3, 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
#
# @author Florian Dold
# @author Marcello Stanisci
from urllib.parse import urljoin, urlencode
import logging
import json
import flask
from .talerconfig import TalerConfig
LOGGER = logging.getLogger(__name__)
TC = TalerConfig.from_env()
BACKEND_URL = TC["frontends"]["backend"].value_string(required=True)
NDIGITS = TC["frontends"]["NDIGITS"].value_int()
CURRENCY = TC["taler"]["CURRENCY"].value_string()
FRACTION_BASE = 1e8
if not NDIGITS:
NDIGITS = 2
class MissingParameterException(Exception):
def __init__(self, param):
self.param = param
super().__init__()
def amount_to_float(amount):
return amount['value'] + (float(amount['fraction']) / float(FRACTION_BASE))
def amount_from_float(floatx):
value = int(floatx)
fraction = int((floatx - value) * FRACTION_BASE)
return dict(currency=CURRENCY, value=value, fraction=fraction)
def join_urlparts(*parts):
ret = ""
part = 0
while part < len(parts):
buf = parts[part]
part += 1
if ret.endswith("/"):
buf = buf.lstrip("/")
elif ret and not buf.startswith("/"):
buf = "/" + buf
ret += buf
return ret
def make_url(page, *query_params):
"""
Return a URL to a page in the current Flask application with the given
query parameters (sequence of key/value pairs).
"""
query = urlencode(query_params)
if page.startswith("/"):
root = flask.request.url_root
page = page.lstrip("/")
else:
root = flask.request.base_url
url = urljoin(root, "%s?%s" % (page, query))
# urlencode is overly eager with quoting, the wallet right now
# needs some characters unquoted.
return url.replace("%24", "$").replace("%7B", "{").replace("%7D", "}")
def expect_parameter(name, alt=None):
value = flask.request.args.get(name, None)
if value is None and alt is None:
LOGGER.error("Missing parameter '%s' from '%s'." % (name, flask.request.args))
raise MissingParameterException(name)
return value if value else alt
def get_query_string():
return flask.request.query_string
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
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