From 4c038de8b3d04f21f3936c46cbf878c2b634ae32 Mon Sep 17 00:00:00 2001
From: Chris Caron <lead2gold@gmail.com>
Date: Tue, 18 Feb 2025 14:59:58 -0500
Subject: [PATCH] IPV4_ONLY and IPV6_ONLY environment control added (#235)

---
 README.md                       |  2 ++
 apprise_api/etc/nginx.conf      |  4 ++--
 apprise_api/gunicorn.conf.py    |  6 ++----
 apprise_api/supervisord-startup | 16 ++++++++++++++++
 4 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/README.md b/README.md
index 0819af5..a584159 100644
--- a/README.md
+++ b/README.md
@@ -398,6 +398,8 @@ The use of environment variables allow you to provide over-rides to default sett
 |--------------------- | ----------- |
 | `PUID` | The User ID you wish the Apprise instance under the hood to run as. The default is `1000` if not otherwise specified.
 | `PGID` | The Group ID you wish the Apprise instance under the hood to run as. The default is `1000` if not otherwise specified.
+| `IPV4_ONLY` | Force an all IPv4 only environment (default supports both IPV4 and IPv6).  Nothing is done if `IPV6_ONLY` is also set as this creates an ambigious setup.
+| `IPV6_ONLY` | Force an all IPv6 only environment (default supports both IPv4 and IPv6).  Nothing is done if `IPV4_ONLY` is also set as this creates an ambigious setup.
 | `APPRISE_DEFAULT_THEME` | Can be set to `light` or `dark`; it defaults to `light` if not otherwise provided.  The theme can be toggled from within the website as well.
 | `APPRISE_DEFAULT_CONFIG_ID` | Defaults to `apprise`.   This is the presumed configuration ID you always default to when accessing the configuration manager via the website.
 | `APPRISE_CONFIG_DIR` | Defines an (optional) persistent store location of all configuration files saved. By default:<br/> - Configuration is written to the `apprise_api/var/config` directory when just using the _Django_ `manage runserver` script. However for the path for the container is `/config`.
diff --git a/apprise_api/etc/nginx.conf b/apprise_api/etc/nginx.conf
index 5bef79a..66d3386 100644
--- a/apprise_api/etc/nginx.conf
+++ b/apprise_api/etc/nginx.conf
@@ -42,8 +42,8 @@ http {
    client_body_in_file_only off;
 
    server {
-      listen      8000;
-      listen [::]:8000;
+      listen      8000; # IPv4 Support
+      listen [::]:8000; # IPv6 Support
 
       # Allow users to map to this file and provide their own custom
       # overrides such as
diff --git a/apprise_api/gunicorn.conf.py b/apprise_api/gunicorn.conf.py
index 065b192..422d3b3 100644
--- a/apprise_api/gunicorn.conf.py
+++ b/apprise_api/gunicorn.conf.py
@@ -38,10 +38,8 @@ pythonpath = '/opt/apprise/webapp'
 
 # bind to port 8000
 bind = [
-    # ipv4
-    '0.0.0.0:8000',
-    # ipv6
-    '[::]:8000'
+    '0.0.0.0:8000',  # IPv4 Support
+    '[::]:8000',  # IPv6 Support
 ]
 
 # Workers are relative to the number of CPU's provided by hosting server
diff --git a/apprise_api/supervisord-startup b/apprise_api/supervisord-startup
index 83220c4..6efa90d 100755
--- a/apprise_api/supervisord-startup
+++ b/apprise_api/supervisord-startup
@@ -70,6 +70,22 @@ sed -i -e "s/^\(user[ \t]*=[ \t]*\).*$/\1$USER/g" \
 sed -i -e "s/^\(group[ \t]*=[ \t]*\).*$/\1$GROUP/g" \
    /opt/apprise/webapp/etc/supervisord.conf
 
+if [ "${IPV4_ONLY+x}" ] && [ "${IPV6_ONLY+x}" ]; then
+  echo -n "Warning: both IPV4_ONLY and IPV6_ONLY flags set; ambigious; no changes made."
+
+# Handle IPV4_ONLY flag
+elif [ "${IPV4_ONLY+x}" ]; then
+  echo -n "Enforcing Exclusive IPv4 environment... "
+  sed -ibak -e '/IPv6 Support/d' /opt/apprise/webapp/etc/nginx.conf /opt/apprise/webapp/gunicorn.conf.py && \
+     echo "Done." || echo "Failed!"
+
+# Handle IPV6_ONLY flag
+elif [ "${IPV6_ONLY+x}" ]; then
+  echo -n "Enforcing Exclusive IPv6 environment... "
+  sed -ibak -e '/IPv4 Support/d' /opt/apprise/webapp/etc/nginx.conf /opt/apprise/webapp/gunicorn.conf.py && \
+     echo "Done." || echo "Failed!"
+fi
+
 # Working directory
 cd /opt/apprise