# frozen_string_literal: true require 'rails_helper' describe EmailMxValidator do describe '#validate' do let(:user) { double(email: 'foo@example.com', errors: double(add: nil)) } 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(: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 exists but 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('mail.example.com', Resolv::DNS::Resource::IN::A).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 A record is blacklisted' do EmailDomainBlock.create!(domain: '1.2.3.4') 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([double(address: '1.2.3.4')]) 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: '2.3.4.5') 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('mail.example.com', Resolv::DNS::Resource::IN::A).and_return([double(address: '2.3.4.5')]) 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 hostname 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('mail.example.com', Resolv::DNS::Resource::IN::A).and_return([double(address: '2.3.4.5')]) 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