3 files changed, 55 insertions, 0 deletions
diff --git a/app/validators/email_validator.rb b/app/validators/email_validator.rb
new file mode 100644
index 000000000..06e9375f6
--- /dev/null
+++ b/app/validators/email_validator.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+class EmailValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    record.errors.add(attribute, I18n.t('users.invalid_email')) if blocked_email?(value)
+  end
+
+  private
+
+  def blocked_email?(value)
+    on_blacklist?(value) || not_on_whitelist?(value)
+  end
+
+  def on_blacklist?(value)
+    return false if Rails.configuration.x.email_domains_blacklist.blank?
+
+    domains = Rails.configuration.x.email_domains_blacklist.gsub('.', '\.')
+    regexp  = Regexp.new("@(.+\\.)?(#{domains})", true)
+
+    value =~ regexp
+  end
+
+  def not_on_whitelist?(value)
+    return false if Rails.configuration.x.email_domains_whitelist.blank?
+
+    domains = Rails.configuration.x.email_domains_whitelist.gsub('.', '\.')
+    regexp  = Regexp.new("@(.+\\.)?(#{domains})", true)
+
+    value !~ regexp
+  end
+end
diff --git a/app/validators/status_length_validator.rb b/app/validators/status_length_validator.rb
new file mode 100644
index 000000000..55135a598
--- /dev/null
+++ b/app/validators/status_length_validator.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class StatusLengthValidator < ActiveModel::Validator
+  MAX_CHARS = 500
+
+  def validate(status)
+    return unless status.local? && !status.reblog?
+    status.errors.add(:text, I18n.t('statuses.over_character_limit', max: MAX_CHARS)) if [status.text, status.spoiler_text].join.length > MAX_CHARS
+  end
+end
diff --git a/app/validators/url_validator.rb b/app/validators/url_validator.rb
new file mode 100644
index 000000000..4a5c4ef3f
--- /dev/null
+++ b/app/validators/url_validator.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class UrlValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    record.errors.add(attribute, I18n.t('applications.invalid_url')) unless compliant?(value)
+  end
+
+  private
+
+  def compliant?(url)
+    parsed_url = Addressable::URI.parse(url)
+    !parsed_url.nil? && %w(http https).include?(parsed_url.scheme) && parsed_url.host
+  end
+end