3 class ArvadosModel < ActiveRecord::Base
4 self.abstract_class = true
6 include CurrentApiClient # current_user, current_api_client, etc.
8 attr_protected :created_at
9 attr_protected :modified_by_user_uuid
10 attr_protected :modified_by_client_uuid
11 attr_protected :modified_at
12 after_initialize :log_start_state
13 before_save :ensure_permission_to_save
14 before_save :ensure_owner_uuid_is_permitted
15 before_save :ensure_ownership_path_leads_to_user
16 before_destroy :ensure_owner_uuid_is_permitted
17 before_destroy :ensure_permission_to_destroy
18 before_create :update_modified_by_fields
19 before_update :maybe_update_modified_by_fields
20 after_create :log_create
21 after_update :log_update
22 after_destroy :log_destroy
23 validate :ensure_serialized_attribute_type
24 validate :normalize_collection_uuids
25 validate :ensure_valid_uuids
27 # Note: This only returns permission links. It does not account for
28 # permissions obtained via user.is_admin or
29 # user.uuid==object.owner_uuid.
30 has_many :permissions, :foreign_key => :head_uuid, :class_name => 'Link', :primary_key => :uuid, :conditions => "link_class = 'permission'", dependent: :destroy
32 class PermissionDeniedError < StandardError
38 class UnauthorizedError < StandardError
44 def self.kind_class(kind)
45 kind.match(/^arvados\#(.+)$/)[1].classify.safe_constantize rescue nil
49 "#{current_api_base}/#{self.class.to_s.pluralize.underscore}/#{self.uuid}"
52 def self.searchable_columns operator
53 textonly_operator = !operator.match(/[<=>]/)
54 self.columns.collect do |col|
55 if [:string, :text].index(col.type)
57 elsif !textonly_operator and [:datetime, :integer].index(col.type)
63 def self.attribute_column attr
64 self.columns.select { |col| col.name == attr.to_s }.first
67 # Return nil if current user is not allowed to see the list of
68 # writers. Otherwise, return a list of user_ and group_uuids with
69 # write permission. (If not returning nil, current_user is always in
70 # the list because can_manage permission is needed to see the list
73 unless (owner_uuid == current_user.uuid or
74 current_user.is_admin or
75 current_user.groups_i_can(:manage).index(owner_uuid))
78 [owner_uuid, current_user.uuid] + permissions.collect do |p|
79 if ['can_write', 'can_manage'].index p.name
85 # Return a query with read permissions restricted to the union of of the
86 # permissions of the members of users_list, i.e. if something is readable by
87 # any user in users_list, it will be readable in the query returned by this
89 def self.readable_by(*users_list)
90 # Get rid of troublesome nils
93 # Check if any of the users are admin. If so, we're done.
94 if users_list.select { |u| u.is_admin }.empty?
96 # Collect the uuids for each user and any groups readable by each user.
97 user_uuids = users_list.map { |u| u.uuid }
98 uuid_list = user_uuids + users_list.flat_map { |u| u.groups_i_can(:read) }
99 sanitized_uuid_list = uuid_list.
100 collect { |uuid| sanitize(uuid) }.join(', ')
105 # This row is owned by a member of users_list, or owned by a group
106 # readable by a member of users_list
108 # This row uuid is the uuid of a member of users_list
110 # A permission link exists ('write' and 'manage' implicitly include
111 # 'read') from a member of users_list, or a group readable by users_list,
112 # to this row, or to the owner of this row (see join() below).
113 permitted_uuids = "(SELECT head_uuid FROM links WHERE link_class='permission' AND tail_uuid IN (#{sanitized_uuid_list}))"
115 sql_conds += ["#{table_name}.owner_uuid in (?)",
116 "#{table_name}.uuid in (?)",
117 "#{table_name}.uuid IN #{permitted_uuids}"]
118 sql_params += [uuid_list, user_uuids]
120 if self == Link and users_list.any?
121 # This row is a 'permission' or 'resources' link class
122 # The uuid for a member of users_list is referenced in either the head
123 # or tail of the link
124 sql_conds += ["(#{table_name}.link_class in (#{sanitize 'permission'}, #{sanitize 'resources'}) AND (#{table_name}.head_uuid IN (?) OR #{table_name}.tail_uuid IN (?)))"]
125 sql_params += [user_uuids, user_uuids]
128 if self == Log and users_list.any?
129 # Link head points to the object described by this row
130 sql_conds += ["#{table_name}.object_uuid IN #{permitted_uuids}"]
132 # This object described by this row is owned by this user, or owned by a group readable by this user
133 sql_conds += ["#{table_name}.object_owner_uuid in (?)"]
134 sql_params += [uuid_list]
137 # Link head points to this row, or to the owner of this row (the thing to be read)
139 # Link tail originates from this user, or a group that is readable by this
140 # user (the identity with authorization to read)
142 # Link class is 'permission' ('write' and 'manage' implicitly include 'read')
143 where(sql_conds.join(' OR '), *sql_params)
145 # At least one user is admin, so don't bother to apply any restrictions.
150 def logged_attributes
156 def ensure_ownership_path_leads_to_user
157 if new_record? or owner_uuid_changed?
158 uuid_in_path = {owner_uuid => true, uuid => true}
160 while (owner_class = self.class.resource_class_for_uuid(x)) != User
163 # Test for cycles with the new version, not the DB contents
165 elsif !owner_class.respond_to? :find_by_uuid
166 raise ActiveRecord::RecordNotFound.new
168 x = owner_class.find_by_uuid(x).owner_uuid
170 rescue ActiveRecord::RecordNotFound => e
171 errors.add :owner_uuid, "is not owned by any user: #{e}"
176 errors.add :owner_uuid, "would create an ownership cycle"
178 errors.add :owner_uuid, "has an ownership cycle"
182 uuid_in_path[x] = true
188 def ensure_owner_uuid_is_permitted
189 raise PermissionDeniedError if !current_user
190 self.owner_uuid ||= current_user.uuid
191 if self.owner_uuid_changed?
192 if current_user.uuid == self.owner_uuid or
193 current_user.can? write: self.owner_uuid
194 # current_user is, or has :write permission on, the new owner
196 logger.warn "User #{current_user.uuid} tried to change owner_uuid of #{self.class.to_s} #{self.uuid} to #{self.owner_uuid} but does not have permission to write to #{self.owner_uuid}"
197 raise PermissionDeniedError
202 elsif current_user.uuid == self.owner_uuid_was or
203 current_user.uuid == self.uuid or
204 current_user.can? write: self.owner_uuid_was
205 # current user is, or has :write permission on, the previous owner
208 logger.warn "User #{current_user.uuid} tried to modify #{self.class.to_s} #{self.uuid} but does not have permission to write #{self.owner_uuid_was}"
209 raise PermissionDeniedError
213 def ensure_permission_to_save
214 unless (new_record? ? permission_to_create : permission_to_update)
215 raise PermissionDeniedError
219 def permission_to_create
220 current_user.andand.is_active
223 def permission_to_update
225 logger.warn "Anonymous user tried to update #{self.class.to_s} #{self.uuid_was}"
228 if !current_user.is_active
229 logger.warn "Inactive user #{current_user.uuid} tried to update #{self.class.to_s} #{self.uuid_was}"
232 return true if current_user.is_admin
233 if self.uuid_changed?
234 logger.warn "User #{current_user.uuid} tried to change uuid of #{self.class.to_s} #{self.uuid_was} to #{self.uuid}"
240 def destroy_permission_links
241 Link.destroy_all(['link_class=? and (head_uuid=? or tail_uuid=?)',
242 'permission', uuid, uuid])
245 def ensure_permission_to_destroy
246 raise PermissionDeniedError unless permission_to_destroy
249 def permission_to_destroy
253 def maybe_update_modified_by_fields
254 update_modified_by_fields if self.changed? or self.new_record?
258 def update_modified_by_fields
259 self.updated_at = Time.now
260 self.owner_uuid ||= current_default_owner if self.respond_to? :owner_uuid=
261 self.modified_at = Time.now
262 self.modified_by_user_uuid = current_user ? current_user.uuid : nil
263 self.modified_by_client_uuid = current_api_client ? current_api_client.uuid : nil
267 def ensure_serialized_attribute_type
268 # Specifying a type in the "serialize" declaration causes rails to
269 # raise an exception if a different data type is retrieved from
270 # the database during load(). The validation preventing such
271 # crash-inducing records from being inserted in the database in
272 # the first place seems to have been left as an exercise to the
274 self.class.serialized_attributes.each do |colname, attr|
276 unless self.attributes[colname].is_a? attr.object_class
277 self.errors.add colname.to_sym, "must be a #{attr.object_class.to_s}"
283 def foreign_key_attributes
284 attributes.keys.select { |a| a.match /_uuid$/ }
287 def skip_uuid_read_permission_check
288 %w(modified_by_client_uuid)
291 def skip_uuid_existence_check
295 def normalize_collection_uuids
296 foreign_key_attributes.each do |attr|
297 attr_value = send attr
298 if attr_value.is_a? String and
299 attr_value.match /^[0-9a-f]{32,}(\+[@\w]+)*$/
301 send "#{attr}=", Collection.normalize_uuid(attr_value)
303 # TODO: abort instead of silently accepting unnormalizable value?
309 @@UUID_REGEX = /^[0-9a-z]{5}-([0-9a-z]{5})-[0-9a-z]{15}$/
311 @@prefixes_hash = nil
312 def self.uuid_prefixes
313 unless @@prefixes_hash
315 ActiveRecord::Base.descendants.reject(&:abstract_class?).each do |k|
316 if k.respond_to?(:uuid_prefix)
317 @@prefixes_hash[k.uuid_prefix] = k
324 def self.uuid_like_pattern
325 "_____-#{uuid_prefix}-_______________"
328 def ensure_valid_uuids
329 specials = [system_user_uuid, 'd41d8cd98f00b204e9800998ecf8427e+0']
331 foreign_key_attributes.each do |attr|
332 if new_record? or send (attr + "_changed?")
333 next if skip_uuid_existence_check.include? attr
334 attr_value = send attr
335 next if specials.include? attr_value
337 if (r = ArvadosModel::resource_class_for_uuid attr_value)
338 unless skip_uuid_read_permission_check.include? attr
339 r = r.readable_by(current_user)
341 if r.where(uuid: attr_value).count == 0
342 errors.add(attr, "'#{attr_value}' not found")
359 def self.readable_by (*u)
364 [{:uuid => u[:uuid]}]
368 def self.resource_class_for_uuid(uuid)
369 if uuid.is_a? ArvadosModel
372 unless uuid.is_a? String
375 if uuid.match /^[0-9a-f]{32}(\+[^,]+)*(,[0-9a-f]{32}(\+[^,]+)*)*$/
380 Rails.application.eager_load!
381 uuid.match @@UUID_REGEX do |re|
382 return uuid_prefixes[re[1]] if uuid_prefixes[re[1]]
385 if uuid.match /.+@.+/
394 @old_attributes = logged_attributes
397 def log_change(event_type)
398 log = Log.new(event_type: event_type).fill_object(self)
401 connection.execute "NOTIFY logs, '#{log.id}'"
406 log_change('create') do |log|
407 log.fill_properties('old', nil, nil)
413 log_change('update') do |log|
414 log.fill_properties('old', @old_etag, @old_attributes)
420 log_change('destroy') do |log|
421 log.fill_properties('old', @old_etag, @old_attributes)