+
+ def act_as_user user
+ user_was = Thread.current[:user]
+ Thread.current[:user] = user
+ begin
+ yield
+ ensure
+ Thread.current[:user] = user_was
+ if user_was
+ user_was.forget_cached_group_perms
+ end
+ end
+ end
+
+ def anonymous_group
+ $anonymous_group = check_cache($anonymous_group) do
+ act_as_system_user do
+ ActiveRecord::Base.transaction do
+ Group.where(uuid: anonymous_group_uuid).
+ first_or_create!(group_class: "role",
+ name: "Anonymous users",
+ description: "Anonymous users")
+ end
+ end
+ end
+ end
+
+ def anonymous_group_read_permission
+ $anonymous_group_read_permission = check_cache($anonymous_group_read_permission) do
+ act_as_system_user do
+ Link.where(tail_uuid: all_users_group.uuid,
+ head_uuid: anonymous_group.uuid,
+ link_class: "permission",
+ name: "can_read").first_or_create!
+ end
+ end
+ end
+
+ def anonymous_user
+ $anonymous_user = check_cache($anonymous_user) do
+ act_as_system_user do
+ User.where(uuid: anonymous_user_uuid).
+ first_or_create!(is_active: false,
+ is_admin: false,
+ email: 'anonymous',
+ first_name: 'Anonymous',
+ last_name: '') do |u|
+ u.save!
+ Link.where(tail_uuid: anonymous_user_uuid,
+ head_uuid: anonymous_group.uuid,
+ link_class: 'permission',
+ name: 'can_read').
+ first_or_create!
+ end
+ end
+ end
+ end
+
+ def public_project_group
+ $public_project_group = check_cache($public_project_group) do
+ act_as_system_user do
+ ActiveRecord::Base.transaction do
+ Group.where(uuid: public_project_uuid).
+ first_or_create!(group_class: "project",
+ name: "Public favorites",
+ description: "Public favorites")
+ end
+ end
+ end
+ end
+
+ def public_project_read_permission
+ $public_project_group_read_permission = check_cache($public_project_group_read_permission) do
+ act_as_system_user do
+ Link.where(tail_uuid: anonymous_group.uuid,
+ head_uuid: public_project_group.uuid,
+ link_class: "permission",
+ name: "can_read").first_or_create!
+ end
+ end
+ end
+
+ def anonymous_user_token_api_client
+ $anonymous_user_token_api_client = check_cache($anonymous_user_token_api_client) do
+ act_as_system_user do
+ ActiveRecord::Base.transaction do
+ ApiClient.find_or_create_by!(is_trusted: false, url_prefix: "", name: "AnonymousUserToken")
+ end
+ end
+ end
+ end
+
+ def system_root_token_api_client
+ $system_root_token_api_client = check_cache($system_root_token_api_client) do
+ act_as_system_user do
+ ActiveRecord::Base.transaction do
+ ApiClient.find_or_create_by!(is_trusted: true, url_prefix: "", name: "SystemRootToken")
+ end
+ end
+ end
+ end
+
+ def empty_collection_pdh
+ 'd41d8cd98f00b204e9800998ecf8427e+0'
+ end
+
+ def empty_collection
+ $empty_collection = check_cache($empty_collection) do
+ act_as_system_user do
+ ActiveRecord::Base.transaction do
+ Collection.
+ where(portable_data_hash: empty_collection_pdh).
+ first_or_create(manifest_text: '', owner_uuid: system_user.uuid, name: "empty collection") do |c|
+ c.save!
+ Link.where(tail_uuid: anonymous_group.uuid,
+ head_uuid: c.uuid,
+ link_class: 'permission',
+ name: 'can_read').
+ first_or_create!
+ c
+ end
+ end
+ end
+ end
+ end
+
+ # Purge the module globals if necessary. If the cached value is
+ # non-nil and the globals weren't purged, return the cached
+ # value. Otherwise, call the block.
+ #
+ # Purge is only done in test mode.
+ def check_cache(cached)
+ if Rails.env != 'test'
+ return (cached || yield)
+ end
+ t = Rails.cache.fetch "CurrentApiClient.$system_globals_reset" do
+ Time.now.to_f
+ end
+ if t != $system_globals_reset
+ reset_system_globals(t)
+ yield
+ else
+ cached || yield
+ end
+ end
+
+ def reset_system_globals(t)
+ $system_globals_reset = t
+ $system_user = nil
+ $system_group = nil
+ $all_users_group = nil
+ $anonymous_group = nil
+ $anonymous_group_read_permission = nil
+ $anonymous_user = nil
+ $public_project_group = nil
+ $public_project_group_read_permission = nil
+ $anonymous_user_token_api_client = nil
+ $system_root_token_api_client = nil
+ $empty_collection = nil
+ end
+ module_function :reset_system_globals