Allow new default domain to be set from webadmin

src/freedombone-installer

@@ -75,6 +75,7 @@ MUTED_WORDS=/root/${PROJECT_NAME}-firewall-words.cfg
 local_hostname=$(grep 'host-name' /etc/avahi/avahi-daemon.conf | awk -F '=' '{print $2}').local
 
 webadmin_install_dir="/var/www/${local_hostname}/htdocs/admin"
+default_domain_file="$webadmin_install_dir/.default_domain.txt"
 scuttlebot_file="$webadmin_install_dir/.scuttlebot_invite.txt"
 email_proxy_file="$webadmin_install_dir/.emailproxy.txt"
 theme_file="$webadmin_install_dir/.theme.txt"
@@ -2980,6 +2981,31 @@ function import_translations {
     fi
 }
 
+function change_default_domain {
+    if [ -f "$default_domain_file" ]; then
+        new_default_domain_name=$(cat "$default_domain_file")
+        rm "$default_domain_file"
+
+        if [ "$new_default_domain_name" ]; then
+            if [ ${#new_default_domain_name} -gt 5 ]; then
+                if [[ "$new_default_domain_name" == *'.'* ]]; then
+
+                    # set the new default domain within the config file
+                    if ! grep -q "NEW_DEFAULT_DOMAIN_NAME=" $CONFIGURATION_FILE; then
+                        echo "NEW_DEFAULT_DOMAIN_NAME=$new_default_domain_name" >> $CONFIGURATION_FILE
+                    else
+                        sed -i "s|NEW_DEFAULT_DOMAIN_NAME=.*|NEW_DEFAULT_DOMAIN_NAME=$new_default_domain_name|g" $CONFIGURATION_FILE
+                    fi
+
+                    # initiate an upgrade
+                    touch "$upgrade_file"
+
+                fi
+            fi
+        fi
+    fi
+}
+
 function create_scuttlebot_invite {
     if [ -f "$scuttlebot_file" ]; then
         if [ -d /etc/scuttlebot ]; then
@@ -3479,6 +3505,7 @@ do
                     webadmin_upgrade
                     create_scuttlebot_invite
                     install_apps_from_webadmin
+                    change_default_domain
                     sleep 1
                     remove_apps_from_webadmin
                 fi