Enable unsubscribe for admin emails

app/controllers/public/unsubscribes_controller.rb

+module Public
+  class UnsubscribesController < ApplicationController
+    skip_before_filter :authenticate_user!,
+                       :reject_blocked, :set_current_user_for_observers,
+                       :add_abilities
+    layout 'public_users'
+
+    def show
+      @user = get_user
+    end
+
+    def create
+      @user = get_user
+      @user.admin_unsubscribe!
+      redirect_to new_user_session_path, notice: 'You have been unsubscribed'
+    end
+
+    protected
+    def get_user
+      @email = "#{params[:email]}.#{params[:format]}"
+      User.where(email: @email).first!
+    end
+  end
+end
\ No newline at end of file

app/models/user.rb

@@ -175,6 +175,7 @@ class User < ActiveRecord::Base
   scope :not_in_project, ->(project) { project.users.present? ? where("id not in (:ids)", ids: project.users.map(&:id) ) : all }
   scope :without_projects, -> { where('id NOT IN (SELECT DISTINCT(user_id) FROM users_projects)') }
   scope :ldap, -> { where(provider:  'ldap') }
+  scope :subscribed_for_admin_email, -> { where(admin_email_unsubscribed_at: nil) }
 
   scope :potential_team_members, ->(team) { team.members.any? ? active.not_in_team(team) : active  }
 
@@ -509,4 +510,8 @@ class User < ActiveRecord::Base
   def system_hook_service
     SystemHooksService.new
   end
+
+  def admin_unsubscribe!
+    update_column :admin_email_unsubscribed_at, Time.now
+  end
 end

app/views/public/unsubscribes/show.html.haml

+%h3.page-title Unsubscribe from Admin notifications
+%p
+  Don't want to receive any updates from your system administrator.
+  By clicking the confirmation button you'll no longer receive these notifications
+
+%hr
+= form_tag public_unsubscribe_path(@email) do
+  %p
+    Yes, I want to unsubscribe
+    %strong= @email
+    from any further admin emails.
+  .form-actions
+    = submit_tag 'Unsubscribe', class: 'btn btn-create'

app/workers/admin_emails_worker.rb

@@ -11,11 +11,11 @@ class AdminEmailsWorker
   def recipient_list(recipient_id)
     case recipient_id
     when 'all'
-      User.where(nil)
+      User.subscribed_for_admin_email
     when /group-(\d+)\z/
-      Group.find($1).users
+      Group.find($1).users.subscribed_for_admin_email
     when /project-(\d+)\z/
-      Project.find($1).users
+      Project.find($1).users.subscribed_for_admin_email
     end
   end
 end
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config/routes.rb

@@ -52,6 +52,8 @@ Gitlab::Application.routes.draw do
   #
   namespace :public do
     resources :projects, only: [:index]
+    get  'unsubscribes/:email', to: 'unsubscribes#show', as: :unsubscribe
+    post 'unsubscribes/:email', to: 'unsubscribes#create'
     root to: "projects#index"
   end
 

spec/workers/admin_emails_worker_spec.rb

+require 'spec_helper'
+
+describe AdminEmailsWorker do
+  context "recipients" do
+    let(:recipient_id) { "group-#{group.id}" }
+    let(:group) { create :group }
+
+    before do
+      2.times do
+        group.add_user(create(:user), Gitlab::Access::DEVELOPER)
+      end
+      unsubscribed_user = create(:user, admin_email_unsubscribed_at: 5.days.ago)
+      group.add_user(unsubscribed_user, Gitlab::Access::DEVELOPER)
+      ActionMailer::Base.deliveries = []
+    end
+
+    it "sends email to subscribed users" do
+      AdminEmailsWorker.new.perform(recipient_id, 'subject', 'body')
+      expect(ActionMailer::Base.deliveries.count).to eql 2
+    end
+  end
+end
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