From 988d263ef16090e2e81b2caada5189469aa6eafb Mon Sep 17 00:00:00 2001
From: Ben Charlton <ben@spod.cx>
Date: Mon, 24 Aug 2020 15:05:21 +0100
Subject: [PATCH 1/3] Allow custom authentication / middleware in config.yaml

---
 InvenTree/InvenTree/settings.py | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/InvenTree/InvenTree/settings.py b/InvenTree/InvenTree/settings.py
index d3a5ee919d..24ba9278c8 100644
--- a/InvenTree/InvenTree/settings.py
+++ b/InvenTree/InvenTree/settings.py
@@ -163,7 +163,7 @@ LOGGING = {
     },
 }
 
-MIDDLEWARE = [
+MIDDLEWARE = CONFIG.get('middleware', [
     'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.locale.LocaleMiddleware',
@@ -173,9 +173,12 @@ MIDDLEWARE = [
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
-
     'InvenTree.middleware.AuthRequiredMiddleware'
-]
+])
+
+AUTHENTICATION_BACKENDS = CONFIG.get('authentication_backends', [
+    'django.contrib.auth.backends.ModelBackend'
+])
 
 # If the debug toolbar is enabled, add the modules
 if DEBUG and CONFIG.get('debug_toolbar', False):

From b6f9590d5593717938c3fcaa81326a9259bae981 Mon Sep 17 00:00:00 2001
From: Ben Charlton <ben@spod.cx>
Date: Mon, 24 Aug 2020 15:24:18 +0100
Subject: [PATCH 2/3] Add default config example to config template

---
 InvenTree/config_template.yaml | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/InvenTree/config_template.yaml b/InvenTree/config_template.yaml
index 1c776a6f7a..0a60e205a1 100644
--- a/InvenTree/config_template.yaml
+++ b/InvenTree/config_template.yaml
@@ -86,4 +86,21 @@ latex:
   enabled: False
   interpreter: pdflatex 
   # Extra options to pass through to the LaTeX interpreter
-  options: ''
\ No newline at end of file
+  options: ''
+
+# Permit custom authentication backends
+#authentication_backends:
+#  - 'django.contrib.auth.backends.ModelBackend'
+
+#  Custom middleware, sometimes needed alongside an authentication backend change.
+#middleware:
+#  - 'django.middleware.security.SecurityMiddleware'
+#  - 'django.contrib.sessions.middleware.SessionMiddleware'
+#  - 'django.middleware.locale.LocaleMiddleware'
+#  - 'django.middleware.common.CommonMiddleware'
+#  - 'django.middleware.csrf.CsrfViewMiddleware'
+#  - 'corsheaders.middleware.CorsMiddleware'
+#  - 'django.contrib.auth.middleware.AuthenticationMiddleware'
+#  - 'django.contrib.messages.middleware.MessageMiddleware'
+#  - 'django.middleware.clickjacking.XFrameOptionsMiddleware'
+#  - 'InvenTree.middleware.AuthRequiredMiddleware'
\ No newline at end of file

From 9149aa1536b5ef4a03ea7641a5971164932402ef Mon Sep 17 00:00:00 2001
From: Ben Charlton <ben@spod.cx>
Date: Mon, 24 Aug 2020 18:04:22 +0100
Subject: [PATCH 3/3] Fix internal server error when serializing stock with no
 location

---
 InvenTree/stock/views.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/InvenTree/stock/views.py b/InvenTree/stock/views.py
index faad9db324..4b62e9903d 100644
--- a/InvenTree/stock/views.py
+++ b/InvenTree/stock/views.py
@@ -1120,7 +1120,8 @@ class StockItemSerialize(AjaxUpdateView):
 
         initials['quantity'] = item.quantity
         initials['serial_numbers'] = item.part.getSerialNumberString(item.quantity)
-        initials['destination'] = item.location.pk
+        if item.location is not None:
+            initials['destination'] = item.location.pk
 
         return initials