Merge pull request 'Add lndhub admin panel, quick stats for admin pages' (#80) from feature/admin_stats into master

Reviewed-on: #80
Reviewed-by: bumi <bumi@noreply.kosmos.org>

app/models/user.rb

@@ -5,11 +5,28 @@ class User < ApplicationRecord
   has_many :invitations, dependent: :destroy
   has_many :donations, dependent: :nullify
 
+  has_one  :lndhub_user, class_name: "LndhubUser", inverse_of: "user",
+                         primary_key: "ln_account", foreign_key: "login"
+
+  has_many :accounts, through: :lndhub_user
+
   validates_uniqueness_of :cn
   validates_length_of :cn, :minimum => 3
+  validates_format_of :cn, with: /\A([a-z0-9\-])*\z/,
+                           if: Proc.new{ |u| u.cn.present? },
+                           message: "is invalid. Please use only letters, numbers and -"
+  validates_format_of :cn, without: /\A-/,
+                           if: Proc.new{ |u| u.cn.present? },
+                           message: "is invalid. Usernames need to start with a letter."
+  validates_format_of :cn, without: /\A(#{Setting.reserved_usernames.join('|')})\z/i,
+                           message: "has already been taken"
+
   validates_uniqueness_of :email
   validates :email, email: true
 
+  scope :confirmed, -> { where.not(confirmed_at: nil) }
+  scope :pending,   -> { where(confirmed_at: nil) }
+
   lockbox_encrypts :ln_login
   lockbox_encrypts :ln_password