Added the stored status and a dummy transaction_store() view to the accounting application.

mia_core/status.py

@@ -0,0 +1,83 @@
+# The core application of the Mia project.
+#   by imacat <imacat@mail.imacat.idv.tw>, 2020/7/24
+
+#  Copyright (c) 2020 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+"""The session-based status management of the Mia core application.
+
+"""
+import random
+
+from django.http import HttpResponseRedirect
+
+from mia_core.utils import UrlBuilder
+
+
+def success_redirect(request, url, success):
+    id = _store(request, {"success": success})
+    return HttpResponseRedirect(str(UrlBuilder(url).add_param("s", id)))
+
+
+def _store(request, status):
+    """Stores the status into the session, and returns the status ID that can
+    be used to retrieve the status later with retrieve().
+
+    Args:
+        request (HttpRequest): The request
+        status (dict): The dict of the status
+
+    Returns:
+        str: The status ID
+    """
+    if "stored_status" not in request.session:
+        request.session["stored_status"] = {}
+    id = _new_status_id(request.session["stored_status"])
+    request.session["stored_status"]["id"] = status
+    return id
+
+
+def _retrieve(request, id):
+    """Stores the status into the session, and returns the status ID that can
+    be used to retrieve the status later with retrieve().
+
+    Args:
+        request (HttpRequest): The request
+        id (str): The status ID
+
+    Returns:
+        dict: The status, or None if the status does not exist.
+    """
+    if "stored_status" not in request.session:
+        return None
+    if id not in request.session["stored_status"]:
+        return None
+    return request.session["stored_status"][id]
+
+
+def _new_status_id(status_store):
+    while True:
+        id = ""
+        while len(id) < 16:
+            n = random.randint(1, 64)
+            if n < 26:
+                id = id + chr(ord("a") + n)
+            elif n < 52:
+                id = id + chr(ord("a") + (n - 26))
+            elif n < 62:
+                id = id + chr(ord("0") + (n - 52))
+            else:
+                id = id + "-_."[n - 62]
+        if id not in status_store:
+            return id