Fix being able to post URLs longer than 4096 characters

app/lib/extractor.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 module Extractor
+  MAX_DOMAIN_LENGTH = 253
+
   extend Twitter::TwitterText::Extractor
 
   module_function
@@ -14,7 +16,12 @@ module Extractor
     text.to_s.scan(Account::MENTION_RE) do |screen_name, _|
       match_data = $LAST_MATCH_INFO
       after = $'
+
       unless Twitter::TwitterText::Regex[:end_mention_match].match?(after)
+        username, domain = screen_name.split('@')
+
+        next if domain.present? && domain.length > MAX_DOMAIN_LENGTH
+
         start_position = match_data.char_begin(1) - 1
         end_position = match_data.char_end(1)
         possible_entries << {