add script to allow invitation from muc in firewall (#13)

Fix this [Disroot/Disroot-Project#151 (comment)](Disroot/Disroot-Project#151 (comment))

Co-authored-by: meaz <meaz@disroot.org>
Reviewed-on: #13
Reviewed-by: muppeth <muppeth@no-reply@disroot.org>
Reviewed-by: antilopa <antilopa@no-reply@disroot.org>
Co-authored-by: meaz <meaz@no-reply@disroot.org>
Co-committed-by: meaz <meaz@no-reply@disroot.org>

defaults/mod.yml

@@ -252,7 +252,7 @@ prosody_modules:
     description: 'Can efficiently block, bounce, drop, forward, copy, redirect stanzas and more.'
     module_enabled: '{{ firewall_module_enabled }}'
     extra_options:
-      - 'firewall_scripts = { "{{ prosody_community_modules_path }}/mod_firewall/scripts/spam-blocking.pfw", "{{ prosody_custom_script_path }}/servers_blocklist.pfw", "{{ prosody_custom_script_path }}/users_blocklist.pfw" }'
+      - 'firewall_scripts = { "{{ prosody_community_modules_path }}/mod_firewall/scripts/spam-blocking.pfw", "{{ prosody_custom_script_path }}/servers_blocklist.pfw", "{{ prosody_custom_script_path }}/users_blocklist.pfw", "{{ prosody_custom_script_path }}/invite_from_muc.pfw }'
 # spam-blocking.pfw is the default Prosody one, needed by the two following
 
   - name: 'http_altconnect'

templates/etc/prosody/custom_scripts/invite_from_muc.pfw

@@ -0,0 +1,12 @@
+# This script depends on spam-blocking.pfw also being loaded
+# Any traffic that is not explicitly blocked or allowed by other
+# rules will be checked against the blocklist.txt file
+# Check mod_firewall/scripts/spam-blocking.pfw
+
+# This script allows invitation to a muc
+
+::user/spam_check_message_custom
+
+TYPE: normal
+INSPECT: {http://jabber.org/protocol/muc#user}x/invite
+PASS.