Block xmpp messages from strangers to mitigate spam, but still allow contact requests

src/freedombone-app-xmpp

@@ -435,6 +435,15 @@ function update_prosody_modules {
         sed -i '/"pep";/a "omemo_all_access"; -- Fix for PEP with OMEMO' /etc/prosody/conf.avail/xmpp.cfg.lua
         sed -i 's|"omemo_all_access";|  "omemo_all_access";|g' /etc/prosody/conf.avail/xmpp.cfg.lua
     fi
+
+    if ! grep -q "block_strangers" /etc/prosody/conf.avail/xmpp.cfg.lua; then
+        sed -i '/"pep";/a "block_strangers"; -- Dont allow messages from strangers' /etc/prosody/conf.avail/xmpp.cfg.lua
+        sed -i 's|"block_strangers";|  "block_strangers";|g' /etc/prosody/conf.avail/xmpp.cfg.lua
+    fi
+    if ! grep -q "block_strangers" /etc/prosody/conf.avail/xmpp.cfg.lua; then
+        sed -i '/"pep";/a "block_strangers"; -- Dont allow messages from strangers' /etc/prosody/conf.avail/xmpp.cfg.lua
+        sed -i 's|"block_strangers";|  "block_strangers";|g' /etc/prosody/conf.avail/xmpp.cfg.lua
+    fi
 }
 
 function prosody_daemon_restart_script {
@@ -748,6 +757,7 @@ function xmpp_modules {
       echo '  "blocklist"; -- Privacy lists';
       echo '  "privacy_lists"; -- Privacy lists';
       echo '  "blocking"; -- Blocking command';
+      echo '  "block_strangers"; -- Dont allow messages from strangers';
       echo '  "roster"; -- Roster versioning';
       echo '  "offline_email"; -- If offline send to email';
       echo '  "offline"; -- Store offline messages';