Admin panel (#496)

* Added the administrator role and functionality that comes with it  (#403)

* GRN-20: Added roles to the user model

* GRN-75: Added a view for admins to see their users

* GRN-77: Added Edit/Delete/Promote ability for admins

* GRN-71: Added admin account by default

* Changed the way locales are shown

* Updated the rest of the locales

* Changed the way available_locales are defined

* Updated locales in Russian

* Updated locaales for German

* Update user.rb

* Update admins.js

* GRN-15: Added the ability to change color and image from admin interface (#425)

* GRN-20: Added roles to the user model

* GRN-75: Added a view for admins to see their users

* GRN-77: Added Edit/Delete/Promote ability for admins

* GRN-71: Added admin account by default

* Changed the way locales are shown

* Updated the rest of the locales

* Changed the way available_locales are defined

* Updated locales in Russian

* Updated locaales for German

* GRN-15: Added the ability for admins to customize color and image

* Update user.rb

* Update user.rb

* Update routes.rb

* Update admins_controller.rb

* GRN-87:Added a super admin role and made changes to how to the design works (#430)

* GRN-20: Added roles to the user model

* GRN-75: Added a view for admins to see their users

* GRN-77: Added Edit/Delete/Promote ability for admins

* GRN-71: Added admin account by default

* Changed the way locales are shown

* Updated the rest of the locales

* Changed the way available_locales are defined

* Updated locales in Russian

* Updated locaales for German

* GRN-15: Added the ability for admins to customize color and image

* Added the super admin and completed the design tab

* Update user.rb

* Update themes_controller_spec.rb

* Update routes.rb

* Update admins_controller.rb

* Removed duplicated code that broke the build after last merge

* GRN-78: Restructured some of the views to make the UI more consistent and responsive (#435)

* GRN-20: Added roles to the user model

* GRN-75: Added a view for admins to see their users

* GRN-77: Added Edit/Delete/Promote ability for admins

* GRN-71: Added admin account by default

* GRN-15: Added the ability for admins to customize color and image

* Added the super admin and completed the design tab

* GRN-78: Cleaned up buttons and moved signin to its own page

* GRN-78: Moved the Rooms and Recordings link to nav bar

* Merge fix

* Views restructure fix (#458)

* Added cache to gitlab-ci.yml

* Restructured seed

* GRN2-99 -> GRN2-106: UI cleanup and refactoring (#478)

* GRN2-98: Change Fullname to Full name

* GRN2-105: Changed View Users to Manage Users

* GRN2-101/103: Updated email to match branding

* GRN2-100: Updated Email Sent flash to be more descriptive

* GRN2-104: Redirect user to sign in page w/ flash after clicking activation link

* GRN2-102: Changed the wording in the verification email

* GRN2-99: Added email form validation

* GRN2-106: Cleaned up Users list front end

* Fixes to rake and admin password validator for passing rubocop

* GRN2-113: Fixed issues with admin panel (#479)

* GRN2-116: Code clean up after restructure of views (#482)

* Removed unused references

* Rubocop

* Added pagination to admin view (#483)

* GRN2-114: Added the ability for admins to ban/unban users (#487)

* Added the ability for admins to ban and unban users

* Update sessions_helper.rb

*  Merge branch 'master' into admin-panel  (#492)

* Updated rubocop gem

* Updated rubocop and fixed issues (#490)

* Rubocop fixes

* GRN2-122: Updated sign in flow for admins and switch design tab to site settings (#489)

* Switched design tab to site settings

* Update _header with spaces instead of tabs

* Added more test cases to increase coverage (#494)

app/models/user.rb

@@ -19,11 +19,14 @@
 require 'bbb_api'
 
 class User < ApplicationRecord
+  rolify
   include ::APIConcern
   include ::BbbApi
 
   attr_accessor :reset_token
+  after_create :assign_default_role
   after_create :initialize_main_room
+
   before_save { email.try(:downcase!) }
 
   before_destroy :destroy_rooms
@@ -33,6 +36,7 @@ class User < ApplicationRecord
 
   validates :name, length: { maximum: 256 }, presence: true
   validates :provider, presence: true
+  validate :check_if_email_can_be_blank
   validates :email, length: { maximum: 256 }, allow_blank: true,
                     uniqueness: { case_sensitive: false, scope: :provider },
                     format: { with: /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i }
@@ -98,6 +102,17 @@ class User < ApplicationRecord
     end
   end
 
+  def self.admins_search(string)
+    search_query = "name LIKE :search OR email LIKE :search OR username LIKE :search" \
+                   " OR created_at LIKE :search OR provider LIKE :search"
+    search_param = "%#{string}%"
+    where(search_query, search: search_param)
+  end
+
+  def self.admins_order(column, direction)
+    order("#{column} #{direction}")
+  end
+
   def all_recordings
     pag_num = Rails.configuration.pagination_number
 
@@ -199,6 +214,18 @@ class User < ApplicationRecord
     create_reset_activation_digest(User.new_token)
   end
 
+  def admin_of?(user)
+    if Rails.configuration.loadbalanced_configuration
+      if has_role? :super_admin
+        id != user.id
+      else
+        (has_role? :admin) && (id != user.id) && (provider == user.provider) && (!user.has_role? :super_admin)
+      end
+    else
+      ((has_role? :admin) || (has_role? :super_admin)) && (id != user.id)
+    end
+  end
+
   def self.digest(string)
     cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST : BCrypt::Engine.cost
     BCrypt::Password.create(string, cost: cost)
@@ -229,4 +256,19 @@ class User < ApplicationRecord
     self.main_room = Room.create!(owner: self, name: I18n.t("home_room"))
     save
   end
+
+  # Initialize the user to use the default user role
+  def assign_default_role
+    add_role(:user) if roles.blank?
+  end
+
+  def check_if_email_can_be_blank
+    if email.blank?
+      if Rails.configuration.loadbalanced_configuration && greenlight_account?
+        errors.add(:email, I18n.t("errors.messages.blank"))
+      elsif provider == "greenlight"
+        errors.add(:email, I18n.t("errors.messages.blank"))
+      end
+    end
+  end
 end