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# frozen_string_literal: true
module Gitlab
class OmniauthInitializer
def initialize(devise_config)
@devise_config = devise_config
end
def execute(providers)
providers.each do |provider|
name = provider['name'].to_sym
add_provider_to_devise(name, *arguments_for(provider))
setup_provider(name)
end
end
private
def add_provider_to_devise(*args)
@devise_config.omniauth(*args)
end
def arguments_for(provider)
provider_arguments = []
%w[app_id app_secret].each do |argument|
provider_arguments << provider[argument] if provider[argument]
end
case provider['args']
when Array
# An Array from the configuration will be expanded.
provider_arguments.concat provider['args']
when Hash
hash_arguments = provider['args'].merge(provider_defaults(provider))
# A Hash from the configuration will be passed as is.
provider_arguments << normalize_hash_arguments(hash_arguments)
end
provider_arguments
end
def normalize_hash_arguments(args)
args.symbolize_keys!
# Rails 5.1 deprecated the use of string names in the middleware
# (https://github.com/rails/rails/commit/83b767ce), so we need to
# pass in the actual class to Devise.
if args[:strategy_class].is_a?(String)
args[:strategy_class] = args[:strategy_class].constantize
end
# Providers that are known to depend on rack-oauth2, like those using
# Omniauth::Strategies::OpenIDConnect, need to be quirked so the
# client_auth_method argument value is passed as a symbol.
if (args[:strategy_class] == OmniAuth::Strategies::OpenIDConnect ||
args[:name] == 'openid_connect') &&
args[:client_auth_method].is_a?(String)
args[:client_auth_method] = args[:client_auth_method].to_sym
end
args
end
def provider_defaults(provider)
case provider['name']
when 'cas3'
{ on_single_sign_out: cas3_signout_handler }
when 'authentiq'
{ remote_sign_out_handler: authentiq_signout_handler }
when 'shibboleth'
{ fail_with_empty_uid: true }
else
{}
end
end
def cas3_signout_handler
lambda do |request|
ticket = request.params[:session_index]
raise "Service Ticket not found." unless Gitlab::Auth::OAuth::Session.valid?(:cas3, ticket)
Gitlab::Auth::OAuth::Session.destroy(:cas3, ticket)
true
end
end
def authentiq_signout_handler
lambda do |request|
authentiq_session = request.params['sid']
if Gitlab::Auth::OAuth::Session.valid?(:authentiq, authentiq_session)
Gitlab::Auth::OAuth::Session.destroy(:authentiq, authentiq_session)
true
else
false
end
end
end
def omniauth_customized_providers
@omniauth_customized_providers ||= build_omniauth_customized_providers
end
# We override this in EE
def build_omniauth_customized_providers
%i[bitbucket jwt]
end
def setup_provider(provider)
case provider
when :kerberos
require 'omniauth-kerberos'
when *omniauth_customized_providers
require_dependency "omni_auth/strategies/#{provider}"
end
end
end
end
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