Add email address support to send_message recipients

See further https://coop.pavilion.tech/t/custom-wizard-pm-access-and-send-copy-of-submission-for-guest-users/3600

lib/custom_wizard/action.rb

@@ -119,20 +119,22 @@ class CustomWizard::Action
 
     params[:target_group_names] = []
     params[:target_usernames] = []
+    params[:target_emails] = []
     [*targets].each do |target|
       if Group.find_by(name: target)
         params[:target_group_names] << target
       elsif User.find_by_username(target)
         params[:target_usernames] << target
-      else
-        #
+      elsif target.match(/@/) # Compare discourse/discourse/app/controllers/posts_controller.rb#L922-L923
+        params[:target_emails] << target
       end
     end
 
     if params[:title].present? &&
        params[:raw].present? &&
        (params[:target_usernames].present? ||
-        params[:target_group_names].present?)
+        params[:target_group_names].present? ||
+        params[:target_emails].present?)
 
       params[:archetype] = Archetype.private_message
 

spec/components/custom_wizard/action_spec.rb

@@ -333,7 +333,7 @@ describe CustomWizard::Action do
       expect(user2.reload.notifications.count).to eq(1)
     end
 
-    it "send_message works with guests are permitted" do
+    it "send_message works when guests are permitted" do
       wizard_template["permitted"] = guests_permitted["permitted"]
       wizard_template.delete("actions")
       wizard_template['actions'] = [send_message]
@@ -354,6 +354,41 @@ describe CustomWizard::Action do
       expect(topic.first.topic_allowed_users.second.user.username).to eq(Discourse.system_user.username)
       expect(post.exists?).to eq(true)
     end
+
+    it "send_message works when guests are permitted and the target is an email address" do
+      Jobs.run_immediately!
+
+      wizard_template["permitted"] = guests_permitted["permitted"]
+      wizard_template.delete("actions")
+
+      send_message["recipient"] = [
+        {
+          "type": "assignment",
+          "output": "step_1_field_1",
+          "output_type": "wizard_field",
+          "output_connector": "set"
+        }
+      ]
+
+      wizard_template['actions'] = [send_message]
+      update_template(wizard_template)
+
+      NotificationEmailer.expects(:process_notification).once
+
+      wizard = CustomWizard::Builder.new(wizard_template["id"], nil, CustomWizard::Wizard.generate_guest_id).build
+      wizard.create_updater(wizard.steps[0].id, step_1_field_1: "guest@email.com").update
+      updater = wizard.create_updater(wizard.steps[1].id, {})
+      updater.update
+
+      topic = Topic.where(archetype: Archetype.private_message, title: "Message title")
+      post = Post.where(topic_id: topic.pluck(:id))
+
+      expect(topic.exists?).to eq(true)
+      expect(topic.first.topic_allowed_users.first.user.staged).to eq(true)
+      expect(topic.first.topic_allowed_users.first.user.primary_email.email).to eq('guest@email.com')
+      expect(topic.first.topic_allowed_users.second.user.username).to eq(Discourse.system_user.username)
+      expect(post.exists?).to eq(true)
+    end
   end
 
   context "business subscription actions" do