1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
# 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 flask import request, jsonify, make_response, current_app, render_template
import flask
from urllib.parse import urljoin, urlencode
import logging
import requests
import re
import datetime
import json
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
def amount_to_float(amount):
return amount['value'] + (float(amount['fraction']) / float(FRACTION_BASE))
def amount_from_float(x):
value = int(x)
fraction = int((x - value) * FRACTION_BASE)
return dict(currency=CURRENCY, value=value, fraction=fraction)
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 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 = request.url_root
page = page.lstrip("/")
else:
root = 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 = request.args.get(name, None)
if value is None and alt is None:
logger.error("Missing parameter '%s' from '%s'." % (name, request.args))
raise MissingParameterException(name)
return value if value else alt
def get_query_string():
return 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
|
