Add pyproject.toml and wsgi module paths

This copies a fix from the Watcher project to support pip 23.1:

https://review.opendev.org/c/openstack/watcher/+/948438

Closes-Bug: #2109584

Change-Id: I91cd5e262513b5427377ce1892e9acfe29e22b21

barbican/wsgi/api.py

@@ -0,0 +1,23 @@
+#    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.
+
+"""WSGI application entry-point for Barbican API."""
+import threading
+
+from barbican.api import app
+
+application = None
+
+
+with threading.Lock():
+    if application is None:
+        application = app.get_api_wsgi_script()

devstack/lib/barbican

@@ -172,7 +172,7 @@ function configure_barbican {
     # SimpleCryptoPlugin settings
     iniset $BARBICAN_CONF simple_crypto_plugin kek "$(python3 -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode('UTF-8'))")"
 
-    write_uwsgi_config "$BARBICAN_UWSGI_CONF" "$BARBICAN_WSGI" "/key-manager"
+    write_uwsgi_config "$BARBICAN_UWSGI_CONF" "$BARBICAN_WSGI" "/key-manager" "" "barbican-api"
     ## Set up keystone
 
     # Turn on the middleware

devstack/settings

@@ -22,7 +22,7 @@ else
     BARBICAN_BIN_DIR=$(get_python_exec_prefix)
 fi
 # WSGI variables
-BARBICAN_WSGI=$BARBICAN_BIN_DIR/barbican-wsgi-api
+BARBICAN_WSGI=barbican.wsgi.api:application
 BARBICAN_UWSGI_CONF=$BARBICAN_CONF_DIR/barbican-uwsgi.ini
 
 # Set Barbican repository

pyproject.toml

@@ -0,0 +1,3 @@
+[build-system]
+requires = ["pbr>=6.0.0", "setuptools>=64.0.0"]
+build-backend = "pbr.build"

setup.cfg

@@ -18,7 +18,6 @@ classifier =
     Programming Language :: Python :: Implementation :: CPython
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
     Programming Language :: Python :: 3.12