feat(prosody): allow s2s whitelist additions (#1940)

* feat(prosody): allow s2s whitelist additions

* change to vhost name to reflect additional uses

* whitespace improvement

docker-compose.yml

@@ -291,6 +291,7 @@ services:
             - PROSODY_TRUSTED_PROXIES
             - PROSODY_VISITOR_INDEX
             - PROSODY_VISITORS_MUC_PREFIX
+            - PROSODY_VISITORS_S2S_VHOSTS
             - PUBLIC_URL
             - STUN_HOST
             - STUN_PORT

prosody/rootfs/defaults/conf.d/visitors.cfg.lua

@@ -104,6 +104,12 @@ s2sout_override = {
 {{ if or $ENABLE_RECORDING $ENABLE_TRANSCRIPTIONS -}}
     ["{{ $XMPP_RECORDER_DOMAIN }}"] = "tcp://{{ $XMPP_SERVER }}:{{ $XMPP_SERVER_S2S_PORT }}";
 {{ end -}}
+{{ if .Env.PROSODY_VISITORS_S2S_VHOSTS -}}
+  {{- range $index, $vhost := (splitList "," .Env.PROSODY_VISITORS_S2S_VHOSTS | compact) }}
+    ["{{ $vhost }}"] = "tcp://{{ $XMPP_SERVER }}:{{ $XMPP_SERVER_S2S_PORT }}";
+  {{ end -}}
+{{ end -}}
+
 }
 
 muc_limit_messages_count = 10;

prosody/rootfs/defaults/prosody.cfg.lua

@@ -224,20 +224,22 @@ s2s_ports = { {{ $S2S_PORT }} } -- Listen on specific s2s port
 
 {{ if eq $PROSODY_MODE "visitors" -}}
 s2s_whitelist = {
-	{{ if $ENABLE_VISITORS -}}
+	{{- if $ENABLE_VISITORS }}
     '{{ $XMPP_MUC_DOMAIN }}'; -- needed for visitors to send messages to main room
     'visitors.{{ $XMPP_DOMAIN }}'; -- needed for sending promotion request to visitors.{{ $XMPP_DOMAIN }} component
     '{{ $XMPP_DOMAIN }}'; -- unavailable presences back to main room
+	{{- end }}
 
-	{{ end -}}
-	{{ if $ENABLE_GUEST_DOMAIN -}}
+    {{- if $ENABLE_GUEST_DOMAIN }}
     '{{ $XMPP_GUEST_DOMAIN }}';
-
-	{{ end }}
+    {{- end }}
     {{ if or $ENABLE_RECORDING $ENABLE_TRANSCRIPTIONS -}}
     '{{ $XMPP_RECORDER_DOMAIN }}';
+	{{- end }}
 
-	{{ end -}}
+    {{- if .Env.PROSODY_VISITORS_S2S_VHOSTS }}
+    '{{ join "';\n    '" (splitList "," .Env.PROSODY_VISITORS_S2S_VHOSTS | compact) }}';
+    {{- end }}
 }
 {{ end -}}