bigbluebutton / greenlight

class SessionsController < ApplicationController

  include Authenticator

  include Registrar

  include Emailer

  include LdapAuthenticator

  skip_before_action :verify_authenticity_token, only: [:omniauth, :fail]

  before_action :check_user_signup_allowed, only: [:new]

  before_action :ensure_unauthenticated_except_twitter, only: [:new, :signin]

  # GET /signin

  def signin

    check_if_twitter_account

    if one_provider

      provider_path = if Rails.configuration.omniauth_ldap

        ldap_signin_path

      else

        "#{Rails.configuration.relative_url_root}/auth/#{providers.first}"

      end

      return redirect_to provider_path

    end

  end

  # GET /ldap_signin

  def ldap_signin

  end

  # GET /signup

  def new

    # Check if the user needs to be invited

    if invite_registration

      redirect_to root_path, flash: { alert: I18n.t("registration.invite.no_invite") } unless params[:invite_token]

      session[:invite_token] = params[:invite_token]

    end

    check_if_twitter_account(true)

    @user = User.new

  end

  # POST /users/login

  def create

    logger.info "Support: #{session_params[:email]} is attempting to login."

    user = User.include_deleted.find_by(email: session_params[:email])

    is_super_admin = user&.has_role? :super_admin

    # Scope user to domain if the user is not a super admin

    user = User.include_deleted.find_by(email: session_params[:email], provider: @user_domain) unless is_super_admin

    # Check user with that email exists

    return redirect_to(signin_path, alert: I18n.t("invalid_credentials")) unless user

    # Check if authenticators have switched

    return switch_account_to_local(user) if !is_super_admin && auth_changed_to_local?(user)

    # Check correct password was entered

    return redirect_to(signin_path, alert: I18n.t("invalid_credentials")) unless user.try(:authenticate,

      session_params[:password])

    # Check that the user is not deleted

    return redirect_to root_path, flash: { alert: I18n.t("registration.banned.fail") } if user.deleted?

    unless is_super_admin

      # Check that the user is a Greenlight account

      return redirect_to(root_path, alert: I18n.t("invalid_login_method")) unless user.greenlight_account?

      # Check that the user has verified their account

      return redirect_to(account_activation_path(email: user.email)) unless user.activated?

    end

    login(user)

  end

  # GET /users/logout

  def destroy

    logout

    redirect_to root_path

  end

  # GET/POST /auth/:provider/callback

  def omniauth

    @auth = request.env['omniauth.auth']

    begin

      process_signin

    rescue => e

      logger.error "Error authenticating via omniauth: #{e}"

      omniauth_fail

    end

  end

  # POST /auth/failure

  def omniauth_fail

    if params[:message].nil?

      redirect_to root_path, alert: I18n.t("omniauth_error")

    else

      redirect_to root_path, alert: I18n.t("omniauth_specific_error", error: params["message"])

    end

  end

  # GET /auth/ldap

  def ldap

    ldap_config = {}

    ldap_config[:host] = ENV['LDAP_SERVER']

    ldap_config[:port] = ENV['LDAP_PORT'].to_i != 0 ? ENV['LDAP_PORT'].to_i : 389

    ldap_config[:bind_dn] = ENV['LDAP_BIND_DN']

    ldap_config[:password] = ENV['LDAP_PASSWORD']

    ldap_config[:encryption] = if ENV['LDAP_METHOD'] == 'ssl'

                                    'simple_tls'

                                elsif ENV['LDAP_METHOD'] == 'tls'

                                    'start_tls'

                                end

    ldap_config[:base] = ENV['LDAP_BASE']

    ldap_config[:uid] = ENV['LDAP_UID']

    result = send_ldap_request(params[:session], ldap_config)

    return redirect_to(ldap_signin_path, alert: I18n.t("invalid_credentials")) unless result

    @auth = parse_auth(result.first, ENV['LDAP_ROLE_FIELD'])

    begin

      process_signin

    rescue => e

      logger.error "Support: Error authenticating via omniauth: #{e}"

      omniauth_fail

    end

  end

  private

  # Verify that GreenLight is configured to allow user signup.

  def check_user_signup_allowed

    redirect_to root_path unless Rails.configuration.allow_user_signup

  end

  def session_params

    params.require(:session).permit(:email, :password)

  end

  def one_provider

    providers = configured_providers

    (!allow_user_signup? || !allow_greenlight_accounts?) && providers.count == 1 &&

      !Rails.configuration.loadbalanced_configuration

  end

  def check_user_exists

    User.exists?(social_uid: @auth['uid'], provider: current_provider)

  end

  def check_user_deleted(email)

    User.deleted.exists?(email: email, provider: @user_domain)

  end

  def check_auth_deleted

    User.deleted.exists?(social_uid: @auth['uid'], provider: current_provider)

  end

  def current_provider

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

  end

  # Check if the user already exists, if not then check for invitation

  def passes_invite_reqs

    return true if @user_exists

    invitation = check_user_invited("", session[:invite_token], @user_domain)

    invitation[:present]

  end

  def process_signin

    @user_exists = check_user_exists

    if !@user_exists && @auth['provider'] == "twitter"

      return redirect_to root_path, flash: { alert: I18n.t("registration.deprecated.twitter_signup") }

    end

    # Check if user is deleted

    return redirect_to root_path, flash: { alert: I18n.t("registration.banned.fail") } if check_auth_deleted

    # If using invitation registration method, make sure user is invited

    # Switch the user to a social account if they exist under the same email with no social uid

    switch_account_to_social if !@user_exists && auth_changed_to_social?(@auth['info']['email'])

    user = User.from_omniauth(@auth)

    logger.info "Support: Auth user #{user.email} is attempting to login."

    # Add pending role if approval method and is a new user

    if approval_registration && !@user_exists

      user.add_role :pending

      # Inform admins that a user signed up if emails are turned on

      send_approval_user_signup_email(user)

      return redirect_to root_path, flash: { success: I18n.t("registration.approval.signup") }

    end

    send_invite_user_signup_email(user) if invite_registration && !@user_exists

    login(user)

    if @auth['provider'] == "twitter"

      flash[:alert] = if allow_user_signup? && allow_greenlight_accounts?

        I18n.t("registration.deprecated.twitter_signin", link: signup_path(old_twitter_user_id: user.id))

      else

        I18n.t("registration.deprecated.twitter_signin", link: signin_path(old_twitter_user_id: user.id))

      end

    end

  end

  # Send the user a password reset email to allow them to set their password

  def switch_account_to_local(user)

    logger.info "Switching social account to local account for #{user.uid}"

    # Send the user a reset password email

    user.create_reset_digest

    send_password_reset_email(user)

    # Overwrite the flash with a more descriptive message if successful

    flash[:success] = I18n.t("reset_password.auth_change") if flash[:success].present?

    redirect_to signin_path

  end

  # Set the user's social id to the new id being passed

  def switch_account_to_social

    user = User.find_by(email: @auth['info']['email'], provider: @user_domain, social_uid: nil)

    logger.info "Switching account to social account for #{user.uid}"

    # Set the user's social id to the one being returned from auth

    user.update_atrribute(:social_uid, @auth['uid'])

  end

end