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fab-manager/app/controllers/users/omniauth_callbacks_controller.rb

111 lines
5.0 KiB
Ruby

# frozen_string_literal: true
# Handle authentication actions via OmniAuth (used by SSO providers)
class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
require 'sso_logger'
logger = SsoLogger.new
active_provider = AuthProvider.active
define_method active_provider.strategy_name do
logger.info "[Users::OmniauthCallbacksController##{active_provider.strategy_name}] initiated"
if request.env['omniauth.params'].blank?
logger.debug 'the user has not provided any authentication token'
@user = User.from_omniauth(request.env['omniauth.auth'])
# Here we create the new user or update the existing one with values retrieved from the SSO.
if @user.id.nil? # => new user (ie. not updating existing)
logger.debug 'trying to create a new user'
# If the username is mapped, we just check its uniqueness as it would break the postgresql
# unique constraint otherwise. If the name is not unique, another unique is generated
if active_provider.sso_fields.include?('user.username')
logger.debug 'the username was already in use, generating a new one'
@user.username = generate_unique_username(@user.username)
end
# If the email is mapped, we check its uniqueness. If the email is already in use, we mark it as duplicate with an
# unique random string, because:
# - if it is the same user, his email will be filled from the SSO when he merge his accounts
# - if it is not the same user, this will prevent the raise of PG::UniqueViolation
if active_provider.sso_fields.include?('user.email') && email_exists?(@user.email)
logger.debug 'the email was already in use, marking it as duplicate'
old_mail = @user.email
@user.email = "<#{old_mail}>#{Devise.friendly_token}-duplicate"
flash[:alert] = t('omniauth.email_already_linked_to_another_account_please_input_your_authentication_code', OLD_MAIL: old_mail)
end
else # => update of an existing user
logger.debug "an existing user was found (id=#{@user.id})"
if username_exists?(@user.username, @user.id)
logger.debug 'the username was already in use, alerting user'
flash[:alert] = t('omniauth.your_username_is_already_linked_to_another_account_unable_to_update_it', USERNAME: @user.username)
@user.username = User.find(@user.id).username
end
if email_exists?(@user.email, @user.id)
logger.debug 'the email was already in use, alerting user'
flash[:alert] = t('omniauth.your_email_address_is_already_linked_to_another_account_unable_to_update_it', EMAIL: @user.email)
@user.email = User.find(@user.id).email
end
end
# We BYPASS THE VALIDATION because, in case of a new user, we want to save him anyway, we'll ask him later to complete his profile (on first login).
# In case of an existing user, we trust the SSO validation as we want the SSO to have authority on users management and policy.
logger.debug 'saving the user'
unless @user.save(validate: false)
logger.error "unable to save the user, an error occurred : #{@user.errors.full_messages.join(', ')}"
end
logger.debug 'signing-in the user and redirecting'
sign_in_and_redirect @user, event: :authentication # this will throw if @user is not activated
else
logger.debug 'the user has provided an authentication token'
@user = User.find_by(auth_token: request.env['omniauth.params']['auth_token'])
# Here the user already exists in the database and request to be linked with the SSO
# so let's update its sso attributes and log him on
logger.debug "found user id=#{@user.id}"
begin
logger.debug 'linking with the omniauth provider'
@user.link_with_omniauth_provider(request.env['omniauth.auth'])
logger.debug 'signing-in the user and redirecting'
sign_in_and_redirect @user, event: :authentication
rescue DuplicateIndexError
logger.error 'user already linked'
redirect_to root_url, alert: t('omniauth.this_account_is_already_linked_to_an_user_of_the_platform', NAME: active_provider.name)
rescue StandardError => e
logger.error "an expected error occurred: #{e}"
raise e
end
end
end
private
def username_exists?(username, exclude_id = nil)
if exclude_id.nil?
User.where('lower(username) = ?', username&.downcase).size.positive?
else
User.where('lower(username) = ?', username&.downcase).where.not(id: exclude_id).size.positive?
end
end
def email_exists?(email, exclude_id = nil)
if exclude_id.nil?
User.where('lower(email) = ?', email&.downcase).size.positive?
else
User.where('lower(email) = ?', email&.downcase).where.not(id: exclude_id).size.positive?
end
end
def generate_unique_username(username)
generated = username
i = 1000
while username_exists?(generated)
generated = username + rand(1..i).to_s
i += 10
end
generated
end
end