bigbluebutton / greenlight

# BigBlueButton open source conferencing system - http://www.bigbluebutton.org/.

#

# Copyright (c) 2018 BigBlueButton Inc. and by respective authors (see below).

#

# This program is free software; you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free Software

# Foundation; either version 3.0 of the License, or (at your option) any later

# version.

#

# BigBlueButton is distributed in the hope that it will be useful, but WITHOUT ANY

# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A

# PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.

require 'bbb_api'

class User < ApplicationRecord

  include Deleteable

  attr_accessor :reset_token

  after_create :setup_user

  before_save { email.try(:downcase!) }

  before_destroy :destroy_rooms

  has_many :rooms

  belongs_to :main_room, class_name: 'Room', foreign_key: :room_id, required: false

  has_and_belongs_to_many :roles, -> { includes :role_permissions }, join_table: :users_roles

  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 }

  validates :password, length: { minimum: 6 }, confirmation: true, if: :greenlight_account?, on: :create

  # Bypass validation if omniauth

  validates :accepted_terms, acceptance: true,

                             unless: -> { !greenlight_account? || !Rails.configuration.terms }

  # We don't want to require password validations on all accounts.

  has_secure_password(validations: false)

  class << self

    include AuthValues

    # Generates a user from omniauth.

    def from_omniauth(auth)

      # Provider is the customer name if in loadbalanced config mode

      provider = auth['provider'] == "bn_launcher" ? auth['info']['customer'] : auth['provider']

      find_or_initialize_by(social_uid: auth['uid'], provider: provider).tap do |u|

        u.name = auth_name(auth) unless u.name

        u.username = auth_username(auth) unless u.username

        u.email = auth_email(auth)

        u.image = auth_image(auth) unless u.image

        auth_roles(u, auth)

        u.email_verified = true

        u.save!

      end

    end

  end

  def self.admins_search(string, role)

    active_database = Rails.configuration.database_configuration[Rails.env]["adapter"]

    # Postgres requires created_at to be cast to a string

    created_at_query = if active_database == "postgresql"

      "created_at::text"

    else

      "created_at"

    end

    search_query = ""

    role_search_param = ""

    if role.nil?

      search_query = "users.name LIKE :search OR email LIKE :search OR username LIKE :search" \

                    " OR users.#{created_at_query} LIKE :search OR users.provider LIKE :search" \

                    " OR roles.name LIKE :roles_search"

      role_search_param = "%#{string}%"

    else

      search_query = "(users.name LIKE :search OR email LIKE :search OR username LIKE :search" \

                    " OR users.#{created_at_query} LIKE :search OR users.provider LIKE :search)" \

                    " AND roles.name = :roles_search"

      role_search_param = role.name

    end

    search_param = "%#{string}%"

    joins("LEFT OUTER JOIN users_roles ON users_roles.user_id = users.id LEFT OUTER JOIN roles " \

      "ON roles.id = users_roles.role_id").distinct

      .where(search_query, search: search_param, roles_search: role_search_param)

  end

  def self.admins_order(column, direction)

    # Arel.sql to avoid sql injection

    order(Arel.sql("#{column} #{direction}"))

  end

  # Activates an account and initialize a users main room

  def activate

    update_attributes(email_verified: true, activated_at: Time.zone.now)

  end

  def activated?

    Rails.configuration.enable_email_verification ? email_verified : true

  end

  # Sets the password reset attributes.

  def create_reset_digest

    self.reset_token = User.new_token

    update_attributes(reset_digest: User.digest(reset_token), reset_sent_at: Time.zone.now)

  end

  # Returns true if the given token matches the digest.

  def authenticated?(attribute, token)

    digest = send("#{attribute}_digest")

    return false if digest.nil?

    BCrypt::Password.new(digest).is_password?(token)

  end

  # Return true if password reset link expires

  def password_reset_expired?

    reset_sent_at < 2.hours.ago

  end

  # Retrives a list of all a users rooms that are not the main room, sorted by last session date.

  def secondary_rooms

    room_list = rooms.where.not(uid: main_room.uid)

    room_list.where.not(last_session: nil).order("last_session desc") + room_list.where(last_session: nil)

  end

  def name_chunk

    charset = ("a".."z").to_a - %w(b i l o s) + ("2".."9").to_a - %w(5 8)

    chunk = name.parameterize[0...3]

    if chunk.empty?

      chunk + (0...3).map { charset.to_a[rand(charset.size)] }.join

    elsif chunk.length == 1

      chunk + (0...2).map { charset.to_a[rand(charset.size)] }.join

    elsif chunk.length == 2

      chunk + (0...1).map { charset.to_a[rand(charset.size)] }.join

    else

      chunk

    end

  end

  def greenlight_account?

    social_uid.nil?

  end

  def activation_token

    # Create the token.

    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

        highest_priority_role.get_permission("can_manage_users") && (id != user.id) && (provider == user.provider) &&

          (!user.has_role? :super_admin)

      end

    else

      (highest_priority_role.get_permission("can_manage_users") || (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)

  end

  # Returns a random token.

  def self.new_token

    SecureRandom.urlsafe_base64

  end

  # role functions

  def highest_priority_role

    roles.by_priority.first

  end

  def add_role(role)

    unless has_role?(role)

      role_provider = Rails.configuration.loadbalanced_configuration ? provider : "greenlight"

      new_role = Role.find_by(name: role, provider: role_provider)

      if new_role.nil?

        return if Role.duplicate_name(role, role_provider) || role.strip.empty?

        new_role = Role.create_new_role(role, role_provider)

      end

      roles << new_role

      save!

    end

  end

  def remove_role(role)

    if has_role?(role)

      role_provider = Rails.configuration.loadbalanced_configuration ? provider : "greenlight"

      roles.delete(Role.find_by(name: role, provider: role_provider))

      save!

    end

  end

  # This rule is disabled as the function name must be has_role?

  # rubocop:disable Naming/PredicateName

  def has_role?(role)

    # rubocop:enable Naming/PredicateName

    roles.exists?(name: role)

  end

  def self.with_role(role)

    User.all_users_with_roles.where(roles: { name: role })

  end

  def self.without_role(role)

    User.where.not(id: with_role(role).pluck(:id))

  end

  def self.all_users_with_roles

    User.joins("INNER JOIN users_roles ON users_roles.user_id = users.id INNER JOIN roles " \

      "ON roles.id = users_roles.role_id INNER JOIN role_permissions ON roles.id = role_permissions.role_id").distinct

  end

  private

  def create_reset_activation_digest(token)

    # Create the digest and persist it.

    update_attribute(:activation_digest, User.digest(token))

    token

  end

  # Destory a users rooms when they are removed.

  def destroy_rooms

    rooms.destroy_all

  end

  def setup_user

    # Initializes a room for the user and assign a BigBlueButton user id.

    id = "gl-#{(0...12).map { rand(65..90).chr }.join.downcase}"

    room = Room.create!(owner: self, name: I18n.t("home_room"))

    update_attributes(uid: id, main_room: room)

    # Initialize the user to use the default user role

    role_provider = Rails.configuration.loadbalanced_configuration ? provider : "greenlight"

    Role.create_default_roles(role_provider) if Role.where(provider: role_provider).count.zero?

    add_role(:user) if roles.blank?

  end