services/api/lib/current_api_client.rb

   1 # Copyright (C) The Arvados Authors. All rights reserved.
   2 #
   3 # SPDX-License-Identifier: AGPL-3.0
   4
   5 $system_user = nil
   6 $system_group = nil
   7 $all_users_group = nil
   8 $anonymous_user = nil
   9 $anonymous_group = nil
  10 $anonymous_group_read_permission = nil
  11 $empty_collection = nil
  12
  13 module CurrentApiClient
  14   def current_user
  15     Thread.current[:user]
  16   end
  17
  18   def current_api_client
  19     Thread.current[:api_client]
  20   end
  21
  22   def current_api_client_authorization
  23     Thread.current[:api_client_authorization]
  24   end
  25
  26   def current_api_base
  27     Thread.current[:api_url_base]
  28   end
  29
  30   def current_default_owner
  31     # owner_uuid for newly created objects
  32     ((current_api_client_authorization &&
  33       current_api_client_authorization.default_owner_uuid) ||
  34      (current_user && current_user.default_owner_uuid) ||
  35      (current_user && current_user.uuid) ||
  36      nil)
  37   end
  38
  39   # Where is the client connecting from?
  40   def current_api_client_ip_address
  41     Thread.current[:api_client_ip_address]
  42   end
  43
  44   def system_user_uuid
  45     [Server::Application.config.uuid_prefix,
  46      User.uuid_prefix,
  47      '000000000000000'].join('-')
  48   end
  49
  50   def system_group_uuid
  51     [Server::Application.config.uuid_prefix,
  52      Group.uuid_prefix,
  53      '000000000000000'].join('-')
  54   end
  55
  56   def anonymous_group_uuid
  57     [Server::Application.config.uuid_prefix,
  58      Group.uuid_prefix,
  59      'anonymouspublic'].join('-')
  60   end
  61
  62   def anonymous_user_uuid
  63     [Server::Application.config.uuid_prefix,
  64      User.uuid_prefix,
  65      'anonymouspublic'].join('-')
  66   end
  67
  68   def system_user
  69     $system_user = check_cache $system_user do
  70       real_current_user = Thread.current[:user]
  71       begin
  72         Thread.current[:user] = User.new(is_admin: true,
  73                                          is_active: true,
  74                                          uuid: system_user_uuid)
  75         User.where(uuid: system_user_uuid).
  76           first_or_create!(is_active: true,
  77                            is_admin: true,
  78                            email: 'root',
  79                            first_name: 'root',
  80                            last_name: '')
  81       ensure
  82         Thread.current[:user] = real_current_user
  83       end
  84     end
  85   end
  86
  87   def system_group
  88     $system_group = check_cache $system_group do
  89       act_as_system_user do
  90         ActiveRecord::Base.transaction do
  91           Group.where(uuid: system_group_uuid).
  92             first_or_create!(name: "System group",
  93                              description: "System group") do |g|
  94             g.save!
  95             User.all.collect(&:uuid).each do |user_uuid|
  96               Link.create!(link_class: 'permission',
  97                            name: 'can_manage',
  98                            tail_uuid: system_group_uuid,
  99                            head_uuid: user_uuid)
 100             end
 101           end
 102         end
 103       end
 104     end
 105   end
 106
 107   def all_users_group_uuid
 108     [Server::Application.config.uuid_prefix,
 109      Group.uuid_prefix,
 110      'fffffffffffffff'].join('-')
 111   end
 112
 113   def all_users_group
 114     $all_users_group = check_cache $all_users_group do
 115       act_as_system_user do
 116         ActiveRecord::Base.transaction do
 117           Group.where(uuid: all_users_group_uuid).
 118             first_or_create!(name: "All users",
 119                              description: "All users",
 120                              group_class: "role")
 121         end
 122       end
 123     end
 124   end
 125
 126   def act_as_system_user
 127     if block_given?
 128       act_as_user system_user do
 129         yield
 130       end
 131     else
 132       Thread.current[:user] = system_user
 133     end
 134   end
 135
 136   def act_as_user user
 137     user_was = Thread.current[:user]
 138     Thread.current[:user] = user
 139     begin
 140       yield
 141     ensure
 142       Thread.current[:user] = user_was
 143     end
 144   end
 145
 146   def anonymous_group
 147     $anonymous_group = check_cache $anonymous_group do
 148       act_as_system_user do
 149         ActiveRecord::Base.transaction do
 150           Group.where(uuid: anonymous_group_uuid).
 151             first_or_create!(group_class: "role",
 152                              name: "Anonymous users",
 153                              description: "Anonymous users")
 154         end
 155       end
 156     end
 157   end
 158
 159   def anonymous_group_read_permission
 160     $anonymous_group_read_permission =
 161         check_cache $anonymous_group_read_permission do
 162       act_as_system_user do
 163         Link.where(tail_uuid: all_users_group.uuid,
 164                    head_uuid: anonymous_group.uuid,
 165                    link_class: "permission",
 166                    name: "can_read").first_or_create!
 167       end
 168     end
 169   end
 170
 171   def anonymous_user
 172     $anonymous_user = check_cache $anonymous_user do
 173       act_as_system_user do
 174         User.where(uuid: anonymous_user_uuid).
 175           first_or_create!(is_active: false,
 176                            is_admin: false,
 177                            email: 'anonymous',
 178                            first_name: 'Anonymous',
 179                            last_name: '') do |u|
 180           u.save!
 181           Link.where(tail_uuid: anonymous_user_uuid,
 182                      head_uuid: anonymous_group.uuid,
 183                      link_class: 'permission',
 184                      name: 'can_read').
 185             first_or_create!
 186         end
 187       end
 188     end
 189   end
 190
 191   def empty_collection_uuid
 192     'd41d8cd98f00b204e9800998ecf8427e+0'
 193   end
 194
 195   def empty_collection
 196     $empty_collection = check_cache $empty_collection do
 197       act_as_system_user do
 198         ActiveRecord::Base.transaction do
 199           Collection.
 200             where(portable_data_hash: empty_collection_uuid).
 201             first_or_create!(manifest_text: '', owner_uuid: anonymous_group.uuid)
 202         end
 203       end
 204     end
 205   end
 206
 207   private
 208
 209   # If the given value is nil, or the cache has been cleared since it
 210   # was set, yield. Otherwise, return the given value.
 211   def check_cache value
 212     if not Rails.env.test? and
 213         ActionController::Base.cache_store.is_a? ActiveSupport::Cache::FileStore and
 214         not File.owned? ActionController::Base.cache_store.cache_path
 215       # If we don't own the cache dir, we're probably
 216       # crunch-dispatch. Whoever we are, using this cache is likely to
 217       # either fail or screw up the cache for someone else. So we'll
 218       # just assume the $globals are OK to live forever.
 219       #
 220       # The reason for making the globals expire with the cache in the
 221       # first place is to avoid leaking state between test cases: in
 222       # production, we don't expect the database seeds to ever go away
 223       # even when the cache is cleared, so there's no particular
 224       # reason to expire our global variables.
 225     else
 226       Rails.cache.fetch "CurrentApiClient.$globals" do
 227         value = nil
 228         true
 229       end
 230     end
 231     return value unless value.nil?
 232     yield
 233   end
 234 end