Add details to error response for POST /api/v1/accounts in REST API (#15803)

app/validators/blacklisted_email_validator.rb

@@ -2,11 +2,11 @@
 
 class BlacklistedEmailValidator < ActiveModel::Validator
   def validate(user)
-    return if user.valid_invitation?
+    return if user.valid_invitation? || user.email.blank?
 
     @email = user.email
 
-    user.errors.add(:email, I18n.t('users.blocked_email_provider')) if blocked_email?
+    user.errors.add(:email, :blocked) if blocked_email?
   end
 
   private

app/validators/email_mx_validator.rb

@@ -4,16 +4,19 @@ require 'resolv'
 
 class EmailMxValidator < ActiveModel::Validator
   def validate(user)
+    return if user.email.blank?
+
     domain = get_domain(user.email)
 
-    if domain.nil?
-      user.errors.add(:email, I18n.t('users.invalid_email'))
+    if domain.blank?
+      user.errors.add(:email, :invalid)
     else
       ips, hostnames = resolve_mx(domain)
+
       if ips.empty?
-        user.errors.add(:email, I18n.t('users.invalid_email_mx'))
+        user.errors.add(:email, :unreachable)
       elsif on_blacklist?(hostnames + ips)
-        user.errors.add(:email, I18n.t('users.blocked_email_provider'))
+        user.errors.add(:email, :blocked)
       end
     end
   end

app/validators/note_length_validator.rb

@@ -2,7 +2,7 @@
 
 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)
+    record.errors.add(attribute, :too_long, message: I18n.t('statuses.over_character_limit', max: options[:maximum]), count: options[:maximum]) if too_long?(value)
   end
 
   private

app/validators/unique_username_validator.rb

@@ -4,7 +4,7 @@
 
 class UniqueUsernameValidator < ActiveModel::Validator
   def validate(account)
-    return if account.username.nil?
+    return if account.username.blank?
 
     normalized_username = account.username.downcase
     normalized_domain = account.domain&.downcase

app/validators/unreserved_username_validator.rb

@@ -3,9 +3,10 @@
 class UnreservedUsernameValidator < ActiveModel::Validator
   def validate(account)
     @username = account.username
-    return if @username.nil?
 
-    account.errors.add(:username, I18n.t('accounts.reserved_username')) if reserved_username?
+    return if @username.blank?
+
+    account.errors.add(:username, :reserved) if reserved_username?
   end
 
   private