Activates multidomain by default when installing with nginx.

debian/jitsi-meet-web-config.postinst

         JITSI_MEET_CONFIG="/etc/jitsi/meet/$JVB_HOSTNAME-config.js"
         if [ ! -f $JITSI_MEET_CONFIG ] ; then
             cp /usr/share/jitsi-meet-web-config/config.js $JITSI_MEET_CONFIG
+            # replaces needed config for multidomain as it works only with nginx
+            sed -i "s/conference.jitsi-meet.example.com/conference.<\!--# echo var=\"subdomain\" default=\"\" -->jitsi-meet.example.com/g" $JITSI_MEET_CONFIG
             sed -i "s/jitsi-meet.example.com/$JVB_HOSTNAME/g" $JITSI_MEET_CONFIG
         fi
 

doc/debian/jitsi-meet-prosody/prosody.cfg.lua-jvb.example

 plugin_paths = { "/usr/share/jitsi-meet/prosody-plugins/" }
 
+-- domain mapper options, must at least have domain base set to use the mapper
+muc_mapper_domain_base = "jitmeet.example.com";
+
 VirtualHost "jitmeet.example.com"
         -- enabled = false -- Remove this line to enable this host
         authentication = "anonymous"
     storage = "null"
     modules_enabled = {
         "muc_meeting_id";
+        "muc_domain_mapper";
         -- "token_verification";
     }
 admins = { "focusUser@auth.jitmeet.example.com" }

doc/debian/jitsi-meet/jitsi-meet.example

     ssl_certificate_key /etc/jitsi/meet/jitsi-meet.example.com.key;
 
     root /usr/share/jitsi-meet;
+
+    # ssi on with javascript for multidomain variables in config.js
     ssi on;
+    ssi_types application/x-javascript application/javascript;
+
     index index.html index.htm;
     error_page 404 /static/404.html;
 
     location @root_path {
         rewrite ^/(.*)$ / break;
     }
+
+    location ~ ^/([^/?&:'"]+)/config.js$
+    {
+       set $subdomain "$1.";
+       set $subdir "$1/";
+
+       alias /etc/jitsi/meet/jitsi-meet.example.com-config.js;
+    }
+
+    #Anything that didn't match above, and isn't a real file, assume it's a room name and redirect to /
+    location ~ ^/([^/?&:'"]+)/(.*)$ {
+        set $subdomain "$1.";
+        set $subdir "$1/";
+        rewrite ^/([^/?&:'"]+)/(.*)$ /$2;
+    }
+
+    # BOSH for subdomains
+    location ~ ^/([^/?&:'"]+)/http-bind {
+        set $subdomain "$1.";
+        set $subdir "$1/";
+        set $prefix "$1";
+
+        rewrite ^/(.*)$ /http-bind;
+    }
 }

doc/example-config-files/multidomain/jitsi.example.com.multidomain.example

         rewrite ^/(.*)$ / break;
     }
 
-    location / {
-        ssi on;
-    }
-
     location ~ ^/([^/?&:'"]+)/config.js$
     {
        set $subdomain "$1.";
         rewrite ^/(.*)$ /http-bind;
     }
 
-}
+}

doc/example-config-files/multidomain/prosody.cfg.multidomain.example

 		"adhoc";
 		"websocket";
 		"http_altconnect";
-    -- include domain mapper as global level module
-        "muc_domain_mapper";
 }
 
 -- domain mapper options, must at least have domain base set to use the mapper

resources/prosody-plugins/mod_muc_domain_mapper.lua

 -- Maps MUC JIDs like room1@muc.foo.example.com to JIDs like [foo]room1@muc.example.com
 -- Must be loaded on the client host in Prosody
 
-module:set_global();
-
 -- It is recommended to set muc_mapper_domain_base to the main domain being served (example.com)
 
 local jid = require "util.jid";
 
 local muc_domain_base = module:get_option_string("muc_mapper_domain_base");
 if not muc_domain_base then
-    module:log("warn", "No 'muc_domain_base' option set, disabling muc_mapper plugin inactive");
+    module:log("warn", "No 'muc_mapper_domain_base' option set, disabling muc_mapper plugin inactive");
     return
 end
 
 function module.load()
     if module.reloading then
         module:log("debug", "Reloading MUC mapper!");
-    else        
+    else
         module:log("debug", "First load of MUC mapper!");
     end
     filters.add_filter_hook(filter_session);
 end
 
 function module.unload()
-    filters.remove_filter_hook(filter_session); 
+    filters.remove_filter_hook(filter_session);
 end
 
 
     end
 end
 
-
-function module.add_host(host_module)
-    module:log("info",
-               "Loading mod_muc_domain_mapper for host %s!", host_module.host);
+function add_host(host)
+    module:log("info", "Loading mod_muc_domain_mapper for host %s!", host);
+    local host_module = module:context(host);
     hook_all_stanzas(incoming_stanza_rewriter, host_module);
     hook_all_stanzas(outgoing_stanza_rewriter, host_module, "pre-");
 end
+
+prosody.events.add_handler("host-activated", add_host);
+for host in pairs(prosody.hosts) do
+    add_host(host);
+end