FEATURE: support disabling emails for non-staff users

app/assets/javascripts/discourse/components/global-notice.js.es6

@@ -22,7 +22,7 @@ export default Ember.Component.extend(bufferedRender({
       notices.push([I18n.t("read_only_mode.enabled"), 'alert-read-only']);
     }
 
-    if (this.siteSettings.disable_emails) {
+    if (this.siteSettings.disable_emails === "yes" || this.siteSettings.disable_emails === "non-staff") {
       notices.push([I18n.t("emails_are_disabled"), 'alert-emails-disabled']);
     }
 

app/controllers/admin/backups_controller.rb

@@ -99,7 +99,7 @@ class Admin::BackupsController < Admin::AdminController
       client_id: params.fetch(:client_id),
       publish_to_message_bus: true,
     }
-    SiteSetting.set_and_log(:disable_emails, true, current_user)
+    SiteSetting.set_and_log(:disable_emails, 'yes', current_user)
     BackupRestore.restore!(current_user.id, opts)
   rescue BackupRestore::OperationRunningError
     render json: failed_json.merge(message: I18n.t("backup.operation_already_running"))

config/locales/server.en.yml

@@ -1486,7 +1486,7 @@ en:
     alternative_reply_by_email_addresses: "List of alternative templates for reply by email incoming email addresses. Example: %{reply_key}@reply.example.com|replies+%{reply_key}@example.com"
     incoming_email_prefer_html: "Use HTML instead of text for incoming email."
 
-    disable_emails: "Prevent Discourse from sending any kind of emails"
+    disable_emails: "Prevent Discourse from sending any kind of emails. Select 'yes' to disable emails for all users. Select 'non-staff' to disable emails for non-staff users only."
 
     strip_images_from_short_emails: "Strip images from emails having size less than 2800 Bytes"
     short_email_length: "Short email length in Bytes"

config/site_settings.yml

@@ -783,8 +783,13 @@ email:
   email_prefix: ''
   email_site_title: ''
   disable_emails:
-    default: false
     client: true
+    type: enum
+    default: 'no'
+    choices:
+      - 'no'
+      - 'yes'
+      - 'non-staff'
   strip_images_from_short_emails: true
   short_email_length: 2800
   display_name_on_email_from:

db/migrate/20180607095414_migrate_disable_emails.rb

@@ -0,0 +1,11 @@
+class MigrateDisableEmails < ActiveRecord::Migration[5.1]
+  def up
+    execute "UPDATE site_settings SET data_type = 7 WHERE name = 'disable_emails';"
+    execute "UPDATE site_settings SET value = 'yes' WHERE value = 't' AND name = 'disable_emails';"
+    execute "UPDATE site_settings SET value = 'no' WHERE value = 'f' AND name = 'disable_emails';"
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end

lib/email/sender.rb

@@ -22,7 +22,7 @@ module Email
     end
 
     def send
-      return if SiteSetting.disable_emails && @email_type.to_s != "admin_login"
+      return if SiteSetting.disable_emails == "yes" && @email_type.to_s != "admin_login"
 
       return if ActionMailer::Base::NullMail === @message
       return if ActionMailer::Base::NullMail === (@message.message rescue nil)
@@ -30,6 +30,11 @@ module Email
       return skip(I18n.t('email_log.message_blank'))    if @message.blank?
       return skip(I18n.t('email_log.message_to_blank')) if @message.to.blank?
 
+      if SiteSetting.disable_emails == "non-staff"
+        user = User.find_by_email(to_address)
+        return unless user && user.staff?
+      end
+
       if @message.text_part
         return skip(I18n.t('email_log.text_part_body_blank')) if @message.text_part.body.to_s.blank?
       else

script/bulk_import/vanilla.rb

@@ -55,7 +55,7 @@ class BulkImport::Vanilla < BulkImport::Base
 
     # SiteSetting.port = 3000
     # SiteSetting.automatic_backups_enabled = false
-    # SiteSetting.disable_emails = true
+    # SiteSetting.disable_emails = "non-staff"
     # etc.
 
     import_users

script/import_scripts/base.rb

@@ -75,7 +75,7 @@ class ImportScripts::Base
       min_personal_message_post_length: 1,
       min_personal_message_title_length: 1,
       allow_duplicate_topic_titles: true,
-      disable_emails: true,
+      disable_emails: "non-staff",
       max_attachment_size_kb: 102400,
       max_image_size_kb: 102400,
       authorized_extensions: '*'

script/import_scripts/ipboard.rb

@@ -70,7 +70,7 @@ class ImportScripts::IpboardSQL < ImportScripts::Base
   # Site settings #
   #################
   # don't send any emails
-  SiteSetting.disable_emails = true
+  SiteSetting.disable_emails = "non-staff"
   # don't send digests (so you can enable email without users noticing)
   SiteSetting.disable_digest_emails = true
   # keep site and users private

script/import_scripts/mbox.rb

@@ -27,7 +27,7 @@ class ImportScripts::Mbox < ImportScripts::Base
   BATCH_SIZE = 1000
 
   # Site settings
-  SiteSetting.disable_emails = true
+  SiteSetting.disable_emails = "non-staff"
 
   # Comment out if each file contains a single message
   # Use formail to split yourself: http://linuxcommand.org/man_pages/formail1.html

script/import_scripts/modx.rb

@@ -24,7 +24,7 @@ class ImportScripts::Modx < ImportScripts::Base
   def initialize
     super
 
-    SiteSetting.disable_emails = true
+    SiteSetting.disable_emails = "non-staff"
 
     @old_username_to_new_usernames = {}
 

script/import_scripts/mybb.rb

@@ -37,7 +37,7 @@ class ImportScripts::MyBB < ImportScripts::Base
   end
 
   def execute
-    SiteSetting.disable_emails = true
+    SiteSetting.disable_emails = "non-staff"
     import_users
     import_categories
     import_posts

script/import_scripts/mylittleforum.rb

@@ -33,7 +33,7 @@ class ImportScripts::MylittleforumSQL < ImportScripts::Base
   QUIET = true
 
   # Site settings
-  SiteSetting.disable_emails = true
+  SiteSetting.disable_emails = "non-staff"
   if FORCE_HOSTNAME
     SiteSetting.force_hostname = FORCE_HOSTNAME
   end

spec/components/email/sender_spec.rb

@@ -3,19 +3,42 @@ require 'email/sender'
 
 describe Email::Sender do
 
+  context "disable_emails is enabled" do
+    let(:user) { Fabricate(:user) }
+    let(:moderator) { Fabricate(:moderator) }
+
+    context "disable_emails is enabled for everyone" do
+      before { SiteSetting.disable_emails = "yes" }
+
       it "doesn't deliver mail when mails are disabled" do
-    SiteSetting.disable_emails = true
         Mail::Message.any_instance.expects(:deliver_now).never
-    message = Mail::Message.new(to: "hello@world.com" , body: "hello")
+        message = Mail::Message.new(to: moderator.email , body: "hello")
         expect(Email::Sender.new(message, :hello).send).to eq(nil)
       end
 
       it "delivers mail when mails are disabled but the email_type is admin_login" do
-    SiteSetting.disable_emails = true
         Mail::Message.any_instance.expects(:deliver_now).once
-    message = Mail::Message.new(to: "hello@world.com" , body: "hello")
+        message = Mail::Message.new(to: moderator.email , body: "hello")
         Email::Sender.new(message, :admin_login).send
       end
+    end
+
+    context "disable_emails is enabled for non-staff users" do
+      before { SiteSetting.disable_emails = "non-staff" }
+
+      it "doesn't deliver mail to normal user" do
+        Mail::Message.any_instance.expects(:deliver_now).never
+        message = Mail::Message.new(to: user.email, body: "hello")
+        expect(Email::Sender.new(message, :hello).send).to eq(nil)
+      end
+
+      it "delivers mail to staff user" do
+        Mail::Message.any_instance.expects(:deliver_now).once
+        message = Mail::Message.new(to: moderator.email, body: "hello")
+        Email::Sender.new(message, :hello).send
+      end
+    end
+  end
 
   it "doesn't deliver mail when the message is of type NullMail" do
     Mail::Message.any_instance.expects(:deliver_now).never

spec/controllers/admin/backups_controller_spec.rb

@@ -169,12 +169,12 @@ describe Admin::BackupsController do
     describe ".restore" do
 
       it "starts a restore" do
-        expect(SiteSetting.disable_emails).to eq(false)
+        expect(SiteSetting.disable_emails).to eq("no")
         BackupRestore.expects(:restore!).with(@admin.id, filename: backup_filename, publish_to_message_bus: true, client_id: "foo")
 
         post :restore, params: { id: backup_filename, client_id: "foo" }, format: :json
 
-        expect(SiteSetting.disable_emails).to eq(true)
+        expect(SiteSetting.disable_emails).to eq("yes")
         expect(response.status).to eq(200)
       end