# frozen_string_literal: true require 'rails_helper' describe EmailMxValidator do describe '#validate' do let(:user) { double(email: 'foo@example.com', sign_up_ip: '1.2.3.4', errors: double(add: nil)) } context 'for an e-mail domain that is explicitly allowed' do around do |block| tmp = Rails.configuration.x.email_domains_whitelist Rails.configuration.x.email_domains_whitelist = 'example.com' block.call Rails.configuration.x.email_domains_whitelist = tmp end it 'does not add errors if there are no DNS records' do resolver = double allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::MX).and_return([]) allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::A).and_return([]) allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::AAAA).and_return([]) allow(resolver).to receive(:timeouts=).and_return(nil) allow(Resolv::DNS).to receive(:open).and_yield(resolver) subject.validate(user) expect(user.errors).to_not have_received(:add) end end it 'adds no error if there are DNS records for the e-mail domain' do resolver = double allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::MX).and_return([]) allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::A).and_return([Resolv::DNS::Resource::IN::A.new('192.0.2.42')]) allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::AAAA).and_return([]) allow(resolver).to receive(:timeouts=).and_return(nil) allow(Resolv::DNS).to receive(:open).and_yield(resolver) subject.validate(user) expect(user.errors).to_not have_received(:add) end it 'adds an error if the TagManager fails to normalize domain' do double = instance_double(TagManager) allow(TagManager).to receive(:instance).and_return(double) allow(double).to receive(:normalize_domain).with('example.com').and_raise(Addressable::URI::InvalidURIError) user = double(email: 'foo@example.com', errors: double(add: nil)) subject.validate(user) expect(user.errors).to have_received(:add) end it 'adds an error if the domain email portion is blank' do user = double(email: 'foo@', errors: double(add: nil)) subject.validate(user) expect(user.errors).to have_received(:add) end it 'adds an error if the email domain name contains empty labels' do resolver = double allow(resolver).to receive(:getresources).with('example..com', Resolv::DNS::Resource::IN::MX).and_return([]) allow(resolver).to receive(:getresources).with('example..com', Resolv::DNS::Resource::IN::A).and_return([Resolv::DNS::Resource::IN::A.new('192.0.2.42')]) allow(resolver).to receive(:getresources).with('example..com', Resolv::DNS::Resource::IN::AAAA).and_return([]) allow(resolver).to receive(:timeouts=).and_return(nil) allow(Resolv::DNS).to receive(:open).and_yield(resolver) user = double(email: 'foo@example..com', sign_up_ip: '1.2.3.4', errors: double(add: nil)) subject.validate(user) expect(user.errors).to have_received(:add) end it 'adds an error if there are no DNS records for the e-mail domain' do resolver = double allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::MX).and_return([]) allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::A).and_return([]) allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::AAAA).and_return([]) allow(resolver).to receive(:timeouts=).and_return(nil) allow(Resolv::DNS).to receive(:open).and_yield(resolver) subject.validate(user) expect(user.errors).to have_received(:add) end it 'adds an error if a MX record does not lead to an IP' do resolver = double allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::MX).and_return([double(exchange: 'mail.example.com')]) allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::A).and_return([]) allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::AAAA).and_return([]) allow(resolver).to receive(:getresources).with('mail.example.com', Resolv::DNS::Resource::IN::A).and_return([]) allow(resolver).to receive(:getresources).with('mail.example.com', Resolv::DNS::Resource::IN::AAAA).and_return([]) allow(resolver).to receive(:timeouts=).and_return(nil) allow(Resolv::DNS).to receive(:open).and_yield(resolver) subject.validate(user) expect(user.errors).to have_received(:add) end it 'adds an error if the MX record is blacklisted' do EmailDomainBlock.create!(domain: 'mail.example.com') resolver = double allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::MX).and_return([double(exchange: 'mail.example.com')]) allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::A).and_return([]) allow(resolver).to receive(:getresources).with('example.com', Resolv::DNS::Resource::IN::AAAA).and_return([]) allow(resolver).to receive(:getresources).with('mail.example.com', Resolv::DNS::Resource::IN::A).and_return([double(address: '2.3.4.5')]) allow(resolver).to receive(:getresources).with('mail.example.com', Resolv::DNS::Resource::IN::AAAA).and_return([double(address: 'fd00::2')]) allow(resolver).to receive(:timeouts=).and_return(nil) allow(Resolv::DNS).to receive(:open).and_yield(resolver) subject.validate(user) expect(user.errors).to have_received(:add) end end end