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

  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

  has_many :rooms

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

  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

    # 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']

      u = find_by(social_uid: auth['uid'], provider: provider)

      if ENV["MAINTENANCE_MODE"] == "readonly"

        raise ActiveRecord::ReadOnlyRecord if u.nil?

        return u

      end

      return User.create(

        name: auth_name(auth),

        username: auth_username(auth),

        email: auth_email(auth),

        social_uid: auth['uid'],

        provider: provider,

        image: auth_image(auth),

        email_verified: true

      ) if u.nil?

      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)

      u.email_verified = true

      u.save!

      u

    end

    private

    # Provider attributes.

    def auth_name(auth)

      case auth['provider']

      when :office365

        auth['info']['display_name']

      else

        auth['info']['name']

      end

    end

    def auth_username(auth)

      case auth['provider']

      when :google

        auth['info']['email'].split('@').first

      when :bn_launcher

        auth['info']['username']

      else

        auth['info']['nickname']

      end

    end

    def auth_email(auth)

      auth['info']['email']

    end

    def auth_image(auth)

      case auth['provider']

      when :twitter

        auth['info']['image'].gsub("http", "https").gsub("_normal", "")

      else

        auth['info']['image']

      end

    end

  end

  def self.admins_search(string)

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

                   " OR users.#{created_at_query} 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(search_params = {}, ret_search_params = false)

    pag_num = Rails.configuration.pagination_number

    pag_loops = rooms.length / pag_num - 1

    res = { recordings: [] }

    (0..pag_loops).each do |i|

      pag_rooms = rooms[pag_num * i, pag_num]

      # bbb.get_recordings returns an object

      # take only the array portion of the object that is returned

      full_res = bbb.get_recordings(meetingID: pag_rooms.pluck(:bbb_id))

      res[:recordings].push(*full_res[:recordings])

    end

    last_pag_room = rooms[pag_num * (pag_loops + 1), rooms.length % pag_num]

    full_res = bbb.get_recordings(meetingID: last_pag_room.pluck(:bbb_id))

    res[:recordings].push(*full_res[:recordings])

    format_recordings(res, search_params, ret_search_params)

  end

  # Activates an account and initialize a users main room

  def activate

    update_attribute(:email_verified, true)

    update_attribute(:activated_at, Time.zone.now)

    save

  end

  def activated?

    return true unless Rails.configuration.enable_email_verification

    email_verified

  end

  # Sets the password reset attributes.

  def create_reset_digest

    self.reset_token = User.new_token

    update_attribute(:reset_digest,  User.digest(reset_token))

    update_attribute(: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

    secondary = (rooms - [main_room])

    no_session, session = secondary.partition { |r| r.last_session.nil? }

    sorted = session.sort_by(&:last_session)

    sorted + no_session

  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?

    return true unless provider # For testing cases when provider is set to null

    return true if provider == "greenlight"

    return false unless Rails.configuration.loadbalanced_configuration

    # Proceed with fetching the provider info

    provider_info = retrieve_provider_info(provider, 'api2', 'getUserGreenlightCredentials')

    provider_info['provider'] == 'greenlight'

  end

  def activation_token

    # Create the token.

    create_reset_activation_digest(User.new_token)

  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

  private

  def create_reset_activation_digest(token)

    # Create the digest and persist it.

    self.activation_digest = User.digest(token)

    save

    token

  end

  # Destory a users rooms when they are removed.

  def destroy_rooms

    rooms.destroy_all

  end

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

  def initialize_main_room

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

    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