FIX: don't invite users with emails configured as 'incoming' (reply, group our category)

lib/email/receiver.rb

@@ -204,6 +204,14 @@ module Email
                                                          .gsub(Regexp.escape("%{reply_key}"), "([[:xdigit:]]{32})")
     end
 
+    def group_incoming_emails_regex
+      @group_incoming_emails_regex ||= Regexp.union Group.pluck(:incoming_email).select(&:present?).uniq
+    end
+
+    def category_email_in_regex
+      @category_email_in_regex ||= Regexp.union Category.pluck(:email_in).select(&:present?).uniq
+    end
+
     def find_related_post
       message_ids = [@mail.in_reply_to, extract_references]
       message_ids.flatten!
@@ -329,7 +337,7 @@ module Email
           @mail[d].address_list.addresses.each do |address_field|
             begin
               email = address_field.address.downcase
-              if email !~ reply_by_email_address_regex
+              if should_invite?(email)
                 user = find_or_create_user(address_field)
                 if can_invite?(topic, user)
                   topic.topic_allowed_users.create!(user_id: user.id)
@@ -344,6 +352,12 @@ module Email
       end
     end
 
+    def should_invite?(email)
+      email !~ reply_by_email_address_regex &&
+      email !~ group_incoming_emails_regex &&
+      email !~ category_email_in_regex
+    end
+
     def can_invite?(topic, user)
       !topic.topic_allowed_users.where(user_id: user.id).exists? &&
       !topic.topic_allowed_groups.where("group_id IN (SELECT group_id FROM group_users WHERE user_id = ?)", user.id).exists?

spec/components/email/receiver_spec.rb

@@ -229,11 +229,11 @@ describe Email::Receiver do
       expect(user.name).to eq("Случайная Имя")
     end
 
-    it "invites everyone in the chain but users whose email matches the 'reply_by_email_address'" do
+    it "invites everyone in the chain but emails configured as 'incoming' (via reply, group or category)" do
       expect { process(:cc) }.to change(Topic, :count)
       emails = Topic.last.allowed_users.pluck(:email)
-      expect(emails.size).to eq(4)
-      expect(emails).to include("someone@else.com", "discourse@bar.com", "team@bar.com", "wat@bar.com")
+      expect(emails.size).to eq(3)
+      expect(emails).to include("someone@else.com", "discourse@bar.com", "wat@bar.com")
     end
 
     it "associates email replies using both 'In-Reply-To' and 'References' headers" do
@@ -244,11 +244,11 @@ describe Email::Receiver do
       expect { process(:email_reply_2) }.to change { topic.posts.count }
       expect { process(:email_reply_3) }.to change { topic.posts.count }
 
-      # Why 6 when we only processed 3 emails?
+      # Why 5 when we only processed 3 emails?
       #   - 3 of them are indeed "regular" posts generated from the emails
-      #   - The 3 others are "small action" posts automatically added because
-      #     we invited 3 users (team@bar.com, two@foo.com and three@foo.com)
-      expect(topic.posts.count).to eq(6)
+      #   - The 2 others are "small action" posts automatically added because
+      #     we invited 2 users (two@foo.com and three@foo.com)
+      expect(topic.posts.count).to eq(5)
 
       # trash all but the 1st post
       topic.ordered_posts[1..-1].each(&:trash!)