Change note length validation to ignore mention domains and URLs (#9717)

Fix #4419

2 files changed, 24 insertions, 2 deletions

diff --git a/app/validators/note_length_validator.rb b/app/validators/note_length_validator.rb
new file mode 100644
index 000000000..5ff6df6df
--- /dev/null
+++ b/app/validators/note_length_validator.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class NoteLengthValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    record.errors.add(attribute, I18n.t('statuses.over_character_limit', max: options[:maximum])) if too_long?(value)
+  end
+
+  private
+
+  def too_long?(value)
+    countable_text(value).mb_chars.grapheme_length > options[:maximum]
+  end
+
+  def countable_text(value)
+    return '' if value.nil?
+
+    value.dup.tap do |new_text|
+      new_text.gsub!(FetchLinkCardService::URL_PATTERN, 'x' * 23)
+      new_text.gsub!(Account::MENTION_RE, '@\2')
+    end
+  end
+end
diff --git a/app/validators/url_validator.rb b/app/validators/url_validator.rb
index f39560d90..d95a03fbf 100644
--- a/app/validators/url_validator.rb
+++ b/app/validators/url_validator.rb
@@ -8,7 +8,7 @@ class UrlValidator < ActiveModel::EachValidator
   private
 
   def compliant?(url)
-    parsed_url = Addressable::URI.parse(url).normalize
-    !parsed_url.nil? && %w(http https).include?(parsed_url.scheme) && parsed_url.host
+    parsed_url = Addressable::URI.parse(url)
+    parsed_url && %w(http https).include?(parsed_url.scheme) && parsed_url.host
   end
 end