[GNUnet-SVN] [taler-backoffice] 13/31: helper module

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dold pushed a commit to branch master
in repository backoffice.

commit 9e2cf1173542ace101dd36f3bee2593ed3f3a48c
Author: Marcello Stanisci <address@hidden>
AuthorDate: Fri Nov 24 20:20:33 2017 +0100

    helper module
---
 talerblog/helpers.py | 104 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)

diff --git a/talerblog/helpers.py b/talerblog/helpers.py
new file mode 100644
index 0000000..257192d
--- /dev/null
+++ b/talerblog/helpers.py
@@ -0,0 +1,104 @@
+#  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

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