FEATURE: Add more columns to outbound EmailLog (#13449)

This adds the following columns to EmailLog:

* cc_addresses
* cc_user_ids
* topic_id
* raw

This is to bring the EmailLog table closer in parity to
IncomingEmail so it can be better utilized for Group SMTP
and IMAP mailing.

The raw column contains the full content of the outbound email,
but _only_ if the new hidden site setting
enable_raw_outbound_email_logging is enabled. Most sites do not
need it, and it's mostly required for IMAP and SMTP sending.

In the next pull request, there will be a migration to backfill
topic_id on the EmailLog table, at which point we can remove the
topic fallback method on EmailLog.

spec/components/email/sender_spec.rb

@@ -336,6 +336,7 @@ describe Email::Sender do
         expect(email_log.email_type).to eq('valid_type')
         expect(email_log.to_address).to eq('eviltrout@test.domain')
         expect(email_log.user_id).to be_blank
+        expect(email_log.raw).to eq(nil)
       end
 
       context 'when the email is sent using group SMTP credentials' do
@@ -355,7 +356,7 @@ describe Email::Sender do
           SiteSetting.enable_smtp = true
         end
 
-        it 'adds the group id to the email log' do
+        it 'adds the group id and raw content to the email log' do
           TopicAllowedGroup.create(topic: post.topic, group: group)
 
           email_sender.send
@@ -365,6 +366,7 @@ describe Email::Sender do
           expect(email_log.to_address).to eq(post.user.email)
           expect(email_log.user_id).to be_blank
           expect(email_log.smtp_group_id).to eq(group.id)
+          expect(email_log.raw).to include("Hello world")
         end
 
         it "does not add any of the mailing list headers" do
@@ -393,6 +395,7 @@ describe Email::Sender do
       it 'should create the right log' do
         email_sender.send
         expect(email_log.post_id).to eq(post.id)
+        expect(email_log.topic_id).to eq(topic.id)
         expect(email_log.topic.id).to eq(topic.id)
       end
     end
@@ -687,4 +690,30 @@ describe Email::Sender do
     end
   end
 
+  context "with cc addresses" do
+    let(:message) do
+      message = Mail::Message.new to: 'eviltrout@test.domain', body: 'test body', cc: 'someguy@test.com;otherguy@xyz.com'
+      message.stubs(:deliver_now)
+      message
+    end
+
+    fab!(:user) { Fabricate(:user) }
+    let(:email_sender) { Email::Sender.new(message, :valid_type, user) }
+
+    it "logs the cc addresses in the email log (but not users if they do not match the emails)" do
+      email_sender.send
+      email_log = EmailLog.last
+      expect(email_log.cc_addresses).to eq("someguy@test.com;otherguy@xyz.com")
+      expect(email_log.cc_users).to eq([])
+    end
+
+    it "logs the cc users if they match the emails" do
+      user1 = Fabricate(:user, email: "someguy@test.com")
+      user2 = Fabricate(:user, email: "otherguy@xyz.com")
+      email_sender.send
+      email_log = EmailLog.last
+      expect(email_log.cc_addresses).to eq("someguy@test.com;otherguy@xyz.com")
+      expect(email_log.cc_users).to match_array([user1, user2])
+    end
+  end
 end