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     [Rails.configuration.ClusterID,
  46      User.uuid_prefix,
  47      '000000000000000'].join('-')
  48   end
  49
  50   def system_group_uuid
  51     [Rails.configuration.ClusterID,
  52      Group.uuid_prefix,
  53      '000000000000000'].join('-')
  54   end
  55
  56   def anonymous_group_uuid
  57     [Rails.configuration.ClusterID,
  58      Group.uuid_prefix,
  59      'anonymouspublic'].join('-')
  60   end
  61
  62   def anonymous_user_uuid
  63     [Rails.configuration.ClusterID,
  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",
  94                              group_class: "role") do |g|
  95             g.save!
  96             User.all.collect(&:uuid).each do |user_uuid|
  97               Link.create!(link_class: 'permission',
  98                            name: 'can_manage',
  99                            tail_uuid: system_group_uuid,
 100                            head_uuid: user_uuid)
 101             end
 102           end
 103         end
 104       end
 105     end
 106   end
 107
 108   def all_users_group_uuid
 109     [Rails.configuration.ClusterID,
 110      Group.uuid_prefix,
 111      'fffffffffffffff'].join('-')
 112   end
 113
 114   def all_users_group
 115     $all_users_group = check_cache $all_users_group do
 116       act_as_system_user do
 117         ActiveRecord::Base.transaction do
 118           Group.where(uuid: all_users_group_uuid).
 119             first_or_create!(name: "All users",
 120                              description: "All users",
 121                              group_class: "role")
 122         end
 123       end
 124     end
 125   end
 126
 127   def act_as_system_user
 128     if block_given?
 129       act_as_user system_user do
 130         yield
 131       end
 132     else
 133       Thread.current[:user] = system_user
 134     end
 135   end
 136
 137   def act_as_user user
 138     user_was = Thread.current[:user]
 139     Thread.current[:user] = user
 140     begin
 141       yield
 142     ensure
 143       Thread.current[:user] = user_was
 144     end
 145   end
 146
 147   def anonymous_group
 148     $anonymous_group = check_cache $anonymous_group do
 149       act_as_system_user do
 150         ActiveRecord::Base.transaction do
 151           Group.where(uuid: anonymous_group_uuid).
 152             first_or_create!(group_class: "role",
 153                              name: "Anonymous users",
 154                              description: "Anonymous users")
 155         end
 156       end
 157     end
 158   end
 159
 160   def anonymous_group_read_permission
 161     $anonymous_group_read_permission =
 162         check_cache $anonymous_group_read_permission do
 163       act_as_system_user do
 164         Link.where(tail_uuid: all_users_group.uuid,
 165                    head_uuid: anonymous_group.uuid,
 166                    link_class: "permission",
 167                    name: "can_read").first_or_create!
 168       end
 169     end
 170   end
 171
 172   def anonymous_user
 173     $anonymous_user = check_cache $anonymous_user do
 174       act_as_system_user do
 175         User.where(uuid: anonymous_user_uuid).
 176           first_or_create!(is_active: false,
 177                            is_admin: false,
 178                            email: 'anonymous',
 179                            first_name: 'Anonymous',
 180                            last_name: '') do |u|
 181           u.save!
 182           Link.where(tail_uuid: anonymous_user_uuid,
 183                      head_uuid: anonymous_group.uuid,
 184                      link_class: 'permission',
 185                      name: 'can_read').
 186             first_or_create!
 187         end
 188       end
 189     end
 190   end
 191
 192   def empty_collection_pdh
 193     'd41d8cd98f00b204e9800998ecf8427e+0'
 194   end
 195
 196   def empty_collection
 197     $empty_collection = check_cache $empty_collection do
 198       act_as_system_user do
 199         ActiveRecord::Base.transaction do
 200           Collection.
 201             where(portable_data_hash: empty_collection_pdh).
 202             first_or_create(manifest_text: '', owner_uuid: system_user.uuid, name: "empty collection") do |c|
 203             c.save!
 204             Link.where(tail_uuid: anonymous_group.uuid,
 205                        head_uuid: c.uuid,
 206                        link_class: 'permission',
 207                        name: 'can_read').
 208                   first_or_create!
 209             c
 210           end
 211         end
 212       end
 213     end
 214   end
 215
 216   private
 217
 218   # If the given value is nil, or the cache has been cleared since it
 219   # was set, yield. Otherwise, return the given value.
 220   def check_cache value
 221     if not Rails.env.test? and
 222         ActionController::Base.cache_store.is_a? ActiveSupport::Cache::FileStore and
 223         not File.owned? ActionController::Base.cache_store.cache_path
 224       # If we don't own the cache dir, we're probably
 225       # crunch-dispatch. Whoever we are, using this cache is likely to
 226       # either fail or screw up the cache for someone else. So we'll
 227       # just assume the $globals are OK to live forever.
 228       #
 229       # The reason for making the globals expire with the cache in the
 230       # first place is to avoid leaking state between test cases: in
 231       # production, we don't expect the database seeds to ever go away
 232       # even when the cache is cleared, so there's no particular
 233       # reason to expire our global variables.
 234     else
 235       Rails.cache.fetch "CurrentApiClient.$globals" do
 236         value = nil
 237         true
 238       end
 239     end
 240     return value unless value.nil?
 241     yield
 242   end
 243 end