services/api/lib/current_api_client.rb

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