Add RemoteStorageAuthorization model

app/models/remote_storage_authorization.rb

@@ -0,0 +1,32 @@
+class RemoteStorageAuthorization < ApplicationRecord
+  belongs_to :user
+
+  serialize :permissions
+
+  validates_presence_of :permissions
+  validates_presence_of :client_id
+
+  scope :valid, -> { where(expire_at: nil).or(where(expire_at: (DateTime.now)..)) }
+  scope :expired, -> { where(expire_at: ..(DateTime.now)) }
+
+  after_initialize do |a|
+    a.permisisons = [] if a.permissions == nil
+  end
+
+  before_create  :generate_token
+
+  def url
+    if self.redirect_uri
+      uri = URI.parse self.redirect_uri
+      "#{uri.scheme}://#{client_id}"
+    else
+      "http://#{client_id}"
+    end
+  end
+
+  private
+
+  def generate_token(length=16)
+    self.token = SecureRandom.hex(length) if self.token.blank?
+  end
+end