feat: Open external ticket URL (#2212)

Author: liveHarshit

app/src/main/java/org/fossasia/openevent/general/event/EventDetailsFragment.kt

@@ -135,7 +135,14 @@ class EventDetailsFragment : Fragment() {
         setupSimilarEvents()
 
         rootView.buttonTickets.setOnClickListener {
-            loadTicketFragment()
+            val ticketUrl = currentEvent?.ticketUrl
+            if (Uri.parse(ticketUrl).host != getString(R.string.FRONTEND_HOST)
+                && !ticketUrl.isNullOrEmpty()) {
+                Utils.openUrl(requireContext(), ticketUrl)
+            } else {
+                loadTicketFragment()
+            }
+
         }
 
         eventViewModel.popMessage