app/helpers/gitlab/auth_helper.rb


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module Gitlab
  module AuthHelper
    PROVIDERS_WITH_ICONS = %w(twitter github gitlab bitbucket google_oauth2).freeze
    FORM_BASED_PROVIDERS = [/\Aldap/, 'kerberos'].freeze

    def ldap_enabled?
      Gitlab.config.ldap.enabled
    end

    def provider_has_icon?(name)
      PROVIDERS_WITH_ICONS.include?(name.to_s)
    end

    def auth_providers
      Gitlab::OAuth::Provider.providers
    end

    def label_for_provider(name)
      Gitlab::OAuth::Provider.label_for(name)
    end

    def form_based_provider?(name)
      FORM_BASED_PROVIDERS.any? { |pattern| pattern === name.to_s }
    end

    def form_based_providers
      auth_providers.select { |provider| form_based_provider?(provider) }
    end

    def button_based_providers
      auth_providers.reject { |provider| form_based_provider?(provider) }
    end

    def provider_image_tag(provider, size = 64)
      label = label_for_provider(provider)

      if provider_has_icon?(provider)
        file_name = "#{provider.to_s.split('_').first}_#{size}.png"

        image_tag("auth_buttons/#{file_name}", alt: label, title: "Sign in with #{label}")
      else
        label
      end
    end

    def auth_active?(provider)
      current_user.identities.exists?(provider: provider.to_s)
    end

    extend self
  end
end