Change e-mail domain blocks to block IPs dynamically (#17635)

* Change e-mail domain blocks to block IPs dynamically

* Update app/workers/scheduler/email_domain_block_refresh_scheduler.rb

Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh>

* Update app/workers/scheduler/email_domain_block_refresh_scheduler.rb

Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh>

Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh>

spec/models/email_domain_block_spec.rb

@@ -9,14 +9,29 @@ RSpec.describe EmailDomainBlock, type: :model do
   end
 
   describe 'block?' do
-    it 'returns true if the domain is registed' do
-      Fabricate(:email_domain_block, domain: 'example.com')
-      expect(EmailDomainBlock.block?('nyarn@example.com')).to eq true
+    let(:input) { nil }
+
+    context 'given an e-mail address' do
+      let(:input) { 'nyarn@example.com' }
+
+      it 'returns true if the domain is blocked' do
+        Fabricate(:email_domain_block, domain: 'example.com')
+        expect(EmailDomainBlock.block?(input)).to be true
+      end
+
+      it 'returns false if the domain is not blocked' do
+        Fabricate(:email_domain_block, domain: 'other-example.com')
+        expect(EmailDomainBlock.block?(input)).to be false
+      end
     end
 
-    it 'returns true if the domain is not registed' do
-      Fabricate(:email_domain_block, domain: 'example.com')
-      expect(EmailDomainBlock.block?('nyarn@example.net')).to eq false
+    context 'given an array of domains' do
+      let(:input) { %w(foo.com mail.foo.com) }
+
+      it 'returns true if the domain is blocked' do
+        Fabricate(:email_domain_block, domain: 'mail.foo.com')
+        expect(EmailDomainBlock.block?(input)).to be true
+      end
     end
   end
 end