fixes #8137

1 files changed, 16 insertions, 1 deletions

diff --git a/talermerchantdemos/httpcommon/__init__.py b/talermerchantdemos/httpcommon/__init__.py
index 518eb1b..d2238ff 100644
--- a/talermerchantdemos/httpcommon/__init__.py
+++ b/talermerchantdemos/httpcommon/__init__.py
@@ -1,6 +1,6 @@
 import flask
 import requests
-from urllib.parse import urljoin
+from urllib.parse import urljoin, urlencode, urlparse, urlunparse
 from flask import request, url_for
 from datetime import datetime
 import time
@@ -117,6 +117,21 @@ def get_locale():
         return "en"
     return lang
 
+##
+# Construct the payment URL where customer can pay the order
+#
+# @param backend_url where the backend is located
+# @param order_id id of the order already created
+# @param session_id session in which the order is going to be paid
+# @param token if the order requires a token 
+# @return the JSON response from the backend, or a error response
+#         if something unexpected happens.
+def backend_payment_url(backend_url, endpoint, session_id, token):
+  final_url = urljoin(backend_url, endpoint)
+  query = urlencode({"token":token, "session_id":session_id})
+  redirect_url = urlparse(final_url)._replace(query=query)
+  return urlunparse(redirect_url)
+    
 
 ##
 # Helper function used inside Jinja2 logic to create a links