Refactor ejabberd API integration

app/services/ejabberd_manager/exchange_contacts.rb

@@ -0,0 +1,25 @@
+module EjabberdManager
+  class ExchangeContacts < EjabberdManagerService
+    def initialize(inviter:, invitee:)
+      @inviter = inviter
+      @invitee = invitee
+    end
+
+    def call
+      return unless @inviter.service_enabled?(:ejabberd) &&
+                    @invitee.service_enabled?(:ejabberd) &&
+                    @inviter.preferences[:xmpp_exchange_contacts_with_invitees]
+
+      add_rosteritem({
+        "localuser": @invitee.cn, "localhost": @invitee.ou,
+        "user": @inviter.cn, "host": @inviter.ou,
+        "nick": @inviter.cn, "group": Setting.ejabberd_buddy_roster, "subs": "both"
+      })
+      add_rosteritem({
+        "localuser": @inviter.cn, "localhost": @inviter.ou,
+        "user": @invitee.cn, "host": @invitee.ou,
+        "nick": @invitee.cn, "group": Setting.ejabberd_buddy_roster, "subs": "both"
+      })
+    end
+  end
+end