validate email format

lib/params/base_validator.rb

@@ -2,6 +2,8 @@
 
 module Params
   class BaseValidator
+    EMAIL_REGEXP = /\A[a-z0-9][\.']?(?:(?:[a-z0-9_-]+[\.\+'])*[a-z0-9_-]+)*@(?:[a-z0-9]+[\.-])*[a-z0-9]+\.[a-z]{2,}\z/i
+
     InvalidParameterError = Class.new(StandardError)
 
     def self.call(...)
@@ -65,6 +67,14 @@ module Params
       raise_error(message || "#{key} must follow the #{regexp.source} format")
     end
 
+    def email_format(params, key, message: nil)
+      return if params.blank?
+      return if params[key].blank?
+      return if params[key].to_s.strip.split(/\s*[;,]\s*/).all? { |email| email.match?(EMAIL_REGEXP) }
+
+      raise_error(message || "#{key} must follow the email format")
+    end
+
     def unique_value(params, key, message: nil)
       return unless params.is_a?(Array)
       return if params.none?

lib/params/submission_create_validator.rb

@@ -22,6 +22,7 @@ module Params
       required(params, %i[emails email])
 
       type(params, :emails, String)
+      email_format(params, :emails, message: 'emails are invalid')
       boolean(params, :send_email)
       type(params, :message, Hash)
 
@@ -43,8 +44,8 @@ module Params
       type(params, :completed_redirect_url, String)
       type(params, :bcc_completed, String)
       type(params, :reply_to, String)
-      format(params, :bcc_completed, /@/, message: 'bcc_completed email is invalid')
-      format(params, :reply_to, /@/, message: 'reply_to email is invalid')
+      email_format(params, :bcc_completed, message: 'bcc_completed email is invalid')
+      email_format(params, :reply_to, message: 'reply_to email is invalid')
       type(params, :message, Hash)
       type(params, :submitters, Array)
 
@@ -75,8 +76,8 @@ module Params
       type(submitter_params, :name, String)
       type(submitter_params, :reply_to, String)
       type(submitter_params, :email, String)
-      format(submitter_params, :email, /@/, message: 'email is invalid')
-      format(submitter_params, :reply_to, /@/, message: 'reply_to email is invalid')
+      email_format(submitter_params, :email, message: 'email is invalid')
+      email_format(submitter_params, :reply_to, message: 'reply_to email is invalid')
       type(submitter_params, :phone, String)
       format(submitter_params, :phone, /\A\+\d+\z/,
              message: 'phone should start with +<country code> and contain only digits')
@@ -106,7 +107,7 @@ module Params
       type(params, :order, String)
       type(params, :completed_redirect_url, String)
       type(params, :bcc_completed, String)
-      format(params, :bcc_completed, /@/, message: 'bcc_completed email is invalid')
+      email_format(params, :bcc_completed, message: 'bcc_completed email is invalid')
       type(params, :message, Hash)
 
       in_path(params, :message) do |message_params|