Add helper method for parsing nostr event tags

app/services/nostr_manager/verify_auth.rb

@@ -7,8 +7,9 @@ module NostrManager
     end
 
     def call
-      site_given      = @event.tags.find{|t| t[0] == "site"}[1]
-      challenge_given = @event.tags.find{|t| t[0] == "challenge"}[1]
+      tags            = parse_tags(@event.tags)
+      site_given      = tags[:site].first
+      challenge_given = tags[:challenge].first
 
       site_given == @site_expected &&
       challenge_given == @challenge_expected

app/services/nostr_manager_service.rb

@@ -1,4 +1,11 @@
 require "nostr"
 
 class NostrManagerService < ApplicationService
+  def parse_tags(tags)
+    out = {}
+    tags.each do |tag|
+      out[tag[0].to_sym] = tag[1, tag.length]
+    end
+    out
+  end
 end