# frozen_string_literal: true

require 'gon'
require 'fogbugz'

class ApplicationController < ActionController::Base
  include Gitlab::GonHelper
  include Gitlab::NoCacheHeaders
  include GitlabRoutingHelper
  include PageLayoutHelper
  include SafeParamsHelper
  include WorkhorseHelper
  include EnforcesTwoFactorAuthentication
  include WithPerformanceBar
  include Gitlab::SearchContext::ControllerConcern
  include PreferredLanguageSwitcher
  include SessionlessAuthentication
  include SessionsHelper
  include ConfirmEmailWarning
  include InitializesCurrentUserMode
  include Impersonation
  include Gitlab::Logging::CloudflareHelper
  include Gitlab::Utils::StrongMemoize
  include ::Gitlab::EndpointAttributes
  include FlocOptOut
  include CheckRateLimit
  extend ContentSecurityPolicyPatch

  before_action :limit_session_time, if: -> { !current_user }
  before_action :authenticate_user!, except: [:route_not_found]
  before_action :enforce_terms!, if: :should_enforce_terms?
  before_action :validate_user_service_ticket!
  before_action :check_password_expiration, if: :html_request?
  before_action :ldap_security_check
  before_action :default_headers
  before_action :add_gon_variables, if: :html_request?
  before_action :configure_permitted_parameters, if: :devise_controller?
  before_action :require_email, unless: :devise_controller?
  before_action :active_user_check, unless: :devise_controller?
  before_action :set_usage_stats_consent_flag
  before_action :check_impersonation_availability
  before_action :required_signup_info

  # Make sure the `auth_user` is memoized so it can be logged, we do this after
  # all other before filters that could have set the user.
  before_action :auth_user

  prepend_around_action :set_current_context

  around_action :sessionless_bypass_admin_mode!, if: :sessionless_user?
  around_action :set_locale
  around_action :set_session_storage
  around_action :set_current_admin

  after_action :set_page_title_header, if: :json_request?
  after_action :ensure_authenticated_session_time, if: -> { current_user }

  protect_from_forgery with: :exception, prepend: true

  helper_method :can?
  helper_method :import_sources_enabled?, :github_import_enabled?,
    :gitea_import_enabled?, :github_import_configured?,
    :gitlab_import_enabled?, :gitlab_import_configured?,
    :bitbucket_import_enabled?, :bitbucket_import_configured?,
    :bitbucket_server_import_enabled?, :fogbugz_import_enabled?,
    :git_import_enabled?, :gitlab_project_import_enabled?,
    :manifest_import_enabled?, :phabricator_import_enabled?,
    :masked_page_url

  def self.endpoint_id_for_action(action_name)
    "#{name}##{action_name}"
  end

  rescue_from Encoding::CompatibilityError do |exception|
    log_exception(exception)
    render "errors/encoding", layout: "errors", status: :internal_server_error
  end

  rescue_from ActiveRecord::RecordNotFound do |exception|
    log_exception(exception)
    render_404
  end

  rescue_from(ActionController::UnknownFormat) do
    render_404
  end

  rescue_from Gitlab::Access::AccessDeniedError do |exception|
    render_403
  end

  rescue_from Gitlab::Auth::IpBlocked do
    Gitlab::AuthLogger.error(
      message: 'Rack_Attack',
      env: :blocklist,
      remote_ip: request.ip,
      request_method: request.request_method,
      path: request.fullpath
    )

    head :forbidden
  end

  rescue_from Gitlab::Auth::TooManyIps do |e|
    head :forbidden, retry_after: Gitlab::Auth::UniqueIpsLimiter.config.unique_ips_limit_time_window
  end

  rescue_from RateLimitedService::RateLimitedError do |e|
    e.log_request(request, current_user)
    response.headers.merge!(e.headers)
    render plain: e.message, status: :too_many_requests
  end

  content_security_policy do |p|
    next if p.directives.blank?
    next unless Gitlab::CurrentSettings.snowplow_enabled? && !Gitlab::CurrentSettings.snowplow_collector_hostname.blank?

    default_connect_src = p.directives['connect-src'] || p.directives['default-src']
    connect_src_values = Array.wrap(default_connect_src) | [Gitlab::CurrentSettings.snowplow_collector_hostname]
    p.connect_src(*connect_src_values)
  end

  def redirect_back_or_default(default: root_path, options: {})
    redirect_back(fallback_location: default, **options)
  end

  def not_found
    render_404
  end

  def route_not_found
    if current_user || browser.bot.search_engine?
      not_found
    else
      store_location_for(:user, request.fullpath) unless request.xhr?

      redirect_to new_user_session_path, alert: I18n.t('devise.failure.unauthenticated')
    end
  end

  def render(*args)
    super.tap do
      # Set a header for custom error pages to prevent them from being intercepted by gitlab-workhorse
      if (400..599).cover?(response.status) && workhorse_excluded_content_types.include?(response.media_type)
        response.headers['X-GitLab-Custom-Error'] = '1'
      end
    end
  end

  def feature_category
    self.class.feature_category_for_action(action_name).to_s
  end

  def urgency
    self.class.urgency_for_action(action_name)
  end

  protected

  def workhorse_excluded_content_types
    @workhorse_excluded_content_types ||= %w[text/html application/json]
  end

  def append_info_to_payload(payload)
    super

    payload[:ua] = request.env["HTTP_USER_AGENT"]
    payload[:remote_ip] = request.remote_ip

    payload[Labkit::Correlation::CorrelationId::LOG_KEY] = Labkit::Correlation::CorrelationId.current_id
    payload[:metadata] = @current_context
    payload[:request_urgency] = urgency&.name
    payload[:target_duration_s] = urgency&.duration
    logged_user = auth_user
    if logged_user.present?
      payload[:user_id] = logged_user.try(:id)
      payload[:username] = logged_user.try(:username)
    end

    payload[:queue_duration_s] = request.env[::Gitlab::Middleware::RailsQueueDuration::GITLAB_RAILS_QUEUE_DURATION_KEY]

    payload[:response_bytes] = response.body_parts.sum(&:bytesize) if Feature.enabled?(:log_response_length)

    store_cloudflare_headers!(payload, request)
  end

  ##
  # Controllers such as GitHttpController may use alternative methods
  # (e.g. tokens) to authenticate the user, whereas Devise sets current_user.
  #
  def auth_user
    strong_memoize(:auth_user) do
      if user_signed_in?
        current_user
      else
        try(:authenticated_user)
      end
    end
  end

  # Devise defines current_user to be:
  #
  # def current_user
  #   @current_user ||= warden.authenticate(scope: mapping)
  # end
  #
  # That means whenever current_user is called and `@current_user` is
  # nil, Warden will attempt to authenticate a user. To avoid
  # reauthenticating anonymous users, we may need to invalidate
  # the user.
  def reset_auth_user!
    return if strong_memoized?(:auth_user) && auth_user

    # Controllers usually call auth_user first, but for some controllers
    # authenticate_sessionless_user! is called after that. If we relied
    # on the memoized auth_user, the value would always be nil for
    # sessionless users.
    clear_memoization(:auth_user)
    auth_user
  end

  def log_exception(exception)
    # At this point, the controller already exits set_current_context around
    # block. To maintain the context while handling error exception, we need to
    # set the context again
    set_current_context do
      Gitlab::ErrorTracking.track_exception(exception)
    end

    backtrace_cleaner = request.env["action_dispatch.backtrace_cleaner"]
    application_trace = ActionDispatch::ExceptionWrapper.new(backtrace_cleaner, exception).application_trace
    application_trace.map! { |t| "  #{t}\n" }
    logger.error "\n#{exception.class.name} (#{exception.message}):\n#{application_trace.join}"
  end

  def after_sign_in_path_for(resource)
    stored_location_for(:redirect) || stored_location_for(resource) || root_path
  end

  def after_sign_out_path_for(resource)
    Gitlab::CurrentSettings.after_sign_out_path.presence || new_user_session_path
  end

  def can?(object, action, subject = :global)
    Ability.allowed?(object, action, subject)
  end

  def access_denied!(message = nil, status = nil)
    # If we display a custom access denied message to the user, we don't want to
    # hide existence of the resource, rather tell them they cannot access it using
    # the provided message
    status ||= message.present? ? :forbidden : :not_found
    template =
      if status == :not_found
        "errors/not_found"
      else
        "errors/access_denied"
      end

    respond_to do |format|
      format.html do
        render template, layout: "errors", status: status, locals: { message: message }
      end
      format.any { head status }
    end
  end

  def git_not_found!
    render template: "errors/git_not_found", formats: :html, layout: "errors", status: :not_found
  end

  def render_403
    respond_to do |format|
      format.html { render template: "errors/access_denied", formats: :html, layout: "errors", status: :forbidden }
      format.any { head :forbidden }
    end
  end

  def render_404
    respond_to do |format|
      format.html { render template: "errors/not_found", formats: :html, layout: "errors", status: :not_found }
      # Prevent the Rails CSRF protector from thinking a missing .js file is a JavaScript file
      format.js { render json: '', status: :not_found, content_type: 'application/json' }
      format.any { head :not_found }
    end
  end

  def render_409(message = nil)
    respond_to do |format|
      format.html { render template: "errors/request_conflict", formats: :html, layout: "errors", status: :conflict, locals: { message: message } }
      format.any { head :conflict }
    end
  end

  def respond_422
    head :unprocessable_entity
  end

  def no_cache_headers
    DEFAULT_GITLAB_NO_CACHE_HEADERS.each do |k, v|
      headers[k] = v
    end
  end

  def stream_headers
    headers['Content-Length'] = nil
    headers['X-Accel-Buffering'] = 'no' # Disable buffering on Nginx
    headers['Last-Modified'] = '0' # Prevent buffering via Rack::ETag middleware
  end

  def default_headers
    headers['X-Frame-Options'] = 'SAMEORIGIN'
    headers['X-XSS-Protection'] = '1; mode=block'
    headers['X-UA-Compatible'] = 'IE=edge'
    headers['X-Content-Type-Options'] = 'nosniff'
  end

  def stream_csv_headers(csv_filename)
    no_cache_headers
    stream_headers

    headers['Content-Type'] = 'text/csv; charset=utf-8; header=present'
    headers['Content-Disposition'] = "attachment; filename=\"#{csv_filename}\""
  end

  def validate_user_service_ticket!
    return unless signed_in? && session[:service_tickets]

    valid = session[:service_tickets].all? do |provider, ticket|
      Gitlab::Auth::OAuth::Session.valid?(provider, ticket)
    end

    unless valid
      session[:service_tickets] = nil
      sign_out current_user
      redirect_to new_user_session_path
    end
  end

  def check_password_expiration
    return if session[:impersonator_id] || !current_user&.allow_password_authentication?

    redirect_to new_profile_password_path if current_user&.password_expired?
  end

  def active_user_check
    return unless current_user && current_user.deactivated?

    sign_out current_user
    flash[:alert] = _("Your account has been deactivated by your administrator. Please log back in to reactivate your account.")
    redirect_to new_user_session_path
  end

  def ldap_security_check
    if current_user && current_user.requires_ldap_check?
      return unless current_user.try_obtain_ldap_lease

      unless Gitlab::Auth::Ldap::Access.allowed?(current_user)
        sign_out current_user
        flash[:alert] = _("Access denied for your LDAP account.")
        redirect_to new_user_session_path
      end
    end
  end

  # JSON for infinite scroll via Pager object
  def pager_json(partial, count, locals = {})
    html = render_to_string(
      partial,
      locals: locals,
      layout: false,
      formats: [:html]
    )

    render json: {
      html: html,
      count: count
    }
  end

  def view_to_html_string(partial, locals = {})
    render_to_string(
      partial,
      locals: locals,
      layout: false,
      formats: [:html]
    )
  end

  def configure_permitted_parameters
    devise_parameter_sanitizer.permit(:sign_in, keys: [:username, :email, :password, :login, :remember_me, :otp_attempt])
  end

  def hexdigest(string)
    Digest::SHA1.hexdigest string
  end

  def require_email
    if current_user && current_user.temp_oauth_email? && session[:impersonator_id].nil?
      redirect_to profile_path, notice: _('Please complete your profile with email address')
    end
  end

  def enforce_terms!
    return unless current_user
    return if current_user.terms_accepted?

    message = _("Please accept the Terms of Service before continuing.")

    if sessionless_user?
      access_denied!(message)
    else
      # Redirect to the destination if the request is a get.
      # Redirect to the source if it was a post, so the user can re-submit after
      # accepting the terms.
      redirect_path = if request.get?
                        request.fullpath
                      elsif request.referer
                        URI(request.referer).path
                      end

      flash[:notice] = message
      redirect_to terms_path(redirect: redirect_path), status: :found
    end
  end

  def import_sources_enabled?
    !Gitlab::CurrentSettings.import_sources.empty?
  end

  def bitbucket_server_import_enabled?
    Gitlab::CurrentSettings.import_sources.include?('bitbucket_server')
  end

  def github_import_enabled?
    Gitlab::CurrentSettings.import_sources.include?('github')
  end

  def gitea_import_enabled?
    Gitlab::CurrentSettings.import_sources.include?('gitea')
  end

  def github_import_configured?
    Gitlab::Auth::OAuth::Provider.enabled?(:github)
  end

  def gitlab_import_enabled?
    request.host != 'gitlab.com' && Gitlab::CurrentSettings.import_sources.include?('gitlab')
  end

  def gitlab_import_configured?
    Gitlab::Auth::OAuth::Provider.enabled?(:gitlab)
  end

  def bitbucket_import_enabled?
    Gitlab::CurrentSettings.import_sources.include?('bitbucket')
  end

  def bitbucket_import_configured?
    Gitlab::Auth::OAuth::Provider.enabled?(:bitbucket)
  end

  def fogbugz_import_enabled?
    Gitlab::CurrentSettings.import_sources.include?('fogbugz')
  end

  def git_import_enabled?
    Gitlab::CurrentSettings.import_sources.include?('git')
  end

  def gitlab_project_import_enabled?
    Gitlab::CurrentSettings.import_sources.include?('gitlab_project')
  end

  def manifest_import_enabled?
    Gitlab::CurrentSettings.import_sources.include?('manifest')
  end

  def phabricator_import_enabled?
    Gitlab::PhabricatorImport.available?
  end

  # U2F (universal 2nd factor) devices need a unique identifier for the application
  # to perform authentication.
  # https://developers.yubico.com/U2F/App_ID.html
  def u2f_app_id
    request.base_url
  end

  def set_current_context(&block)
    Gitlab::ApplicationContext.push(
      user: -> { context_user },
      project: -> { @project if @project&.persisted? },
      namespace: -> { @group if @group&.persisted? },
      caller_id: self.class.endpoint_id_for_action(action_name),
      remote_ip: request.ip,
      feature_category: feature_category
    )
    yield
  ensure
    @current_context = Gitlab::ApplicationContext.current
  end

  def set_locale(&block)
    if current_user
      Gitlab::I18n.with_user_locale(current_user, &block)
    else
      Gitlab::I18n.with_locale(preferred_language, &block)
    end
  end

  def set_session_storage(&block)
    return yield if sessionless_user?

    Gitlab::Session.with_session(session, &block)
  end

  def set_page_title_header
    # Per https://www.rfc-editor.org/rfc/rfc5987, headers need to be ISO-8859-1, not UTF-8
    response.headers['Page-Title'] = Addressable::URI.encode_component(page_title('GitLab'))
  end

  def set_current_admin(&block)
    return yield unless Gitlab::CurrentSettings.admin_mode
    return yield unless current_user

    Gitlab::Auth::CurrentUserMode.with_current_admin(current_user, &block)
  end

  def html_request?
    request.format.html?
  end

  def json_request?
    request.format.json?
  end

  def should_enforce_terms?
    return false unless Gitlab::CurrentSettings.current_application_settings.enforce_terms

    html_request? && !devise_controller?
  end

  def public_visibility_restricted?
    Gitlab::VisibilityLevel.public_visibility_restricted?
  end

  def set_usage_stats_consent_flag
    return unless current_user
    return if sessionless_user?
    return if session.has_key?(:ask_for_usage_stats_consent)

    session[:ask_for_usage_stats_consent] = current_user.requires_usage_stats_consent?

    disable_usage_stats if session[:ask_for_usage_stats_consent]
  end

  def disable_usage_stats
    application_setting_params = {
      usage_ping_enabled: false,
      version_check_enabled: false,
      skip_usage_stats_user: true
    }
    settings = Gitlab::CurrentSettings.current_application_settings

    ApplicationSettings::UpdateService
      .new(settings, current_user, application_setting_params)
      .execute
  end

  def allow_gitaly_ref_name_caching
    ::Gitlab::GitalyClient.allow_ref_name_caching do
      yield
    end
  end

  # Avoid loading the auth_user again after the request. Otherwise calling
  # `auth_user` again would also trigger the Warden callbacks again
  def context_user
    auth_user if strong_memoized?(:auth_user)
  end

  def required_signup_info
    return unless current_user
    return unless current_user.role_required?

    store_location_for :user, request.fullpath

    redirect_to users_sign_up_welcome_path
  end
end

ApplicationController.prepend_mod