2 class ArvadosModel < ActiveRecord::Base
3 self.abstract_class = true
5 include CurrentApiClient # current_user, current_api_client, etc.
7 attr_protected :created_at
8 attr_protected :modified_by_user_uuid
9 attr_protected :modified_by_client_uuid
10 attr_protected :modified_at
11 after_initialize :log_start_state
12 before_save :ensure_permission_to_save
13 before_save :ensure_owner_uuid_is_permitted
14 before_save :ensure_ownership_path_leads_to_user
15 before_destroy :ensure_owner_uuid_is_permitted
16 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'"
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 a query with read permissions restricted to the union of of the
68 # permissions of the members of users_list, i.e. if something is readable by
69 # any user in users_list, it will be readable in the query returned by this
71 def self.readable_by(*users_list)
72 # Get rid of troublesome nils
75 # Check if any of the users are admin. If so, we're done.
76 if users_list.select { |u| u.is_admin }.empty?
78 # Collect the uuids for each user and any groups readable by each user.
79 user_uuids = users_list.map { |u| u.uuid }
80 uuid_list = user_uuids + users_list.flat_map { |u| u.groups_i_can(:read) }
81 sanitized_uuid_list = uuid_list.
82 collect { |uuid| sanitize(uuid) }.join(', ')
87 # This row is owned by a member of users_list, or owned by a group
88 # readable by a member of users_list
90 # This row uuid is the uuid of a member of users_list
92 # A permission link exists ('write' and 'manage' implicitly include
93 # 'read') from a member of users_list, or a group readable by users_list,
94 # to this row, or to the owner of this row (see join() below).
95 permitted_uuids = "(SELECT head_uuid FROM links WHERE link_class='permission' AND tail_uuid IN (#{sanitized_uuid_list}))"
97 sql_conds += ["#{table_name}.owner_uuid in (?)",
98 "#{table_name}.uuid in (?)",
99 "#{table_name}.uuid IN #{permitted_uuids}"]
100 sql_params += [uuid_list, user_uuids]
102 if self == Link and users_list.any?
103 # This row is a 'permission' or 'resources' link class
104 # The uuid for a member of users_list is referenced in either the head
105 # or tail of the link
106 sql_conds += ["(#{table_name}.link_class in (#{sanitize 'permission'}, #{sanitize 'resources'}) AND (#{table_name}.head_uuid IN (?) OR #{table_name}.tail_uuid IN (?)))"]
107 sql_params += [user_uuids, user_uuids]
110 if self == Log and users_list.any?
111 # Link head points to the object described by this row
112 sql_conds += ["#{table_name}.object_uuid IN #{permitted_uuids}"]
114 # This object described by this row is owned by this user, or owned by a group readable by this user
115 sql_conds += ["#{table_name}.object_owner_uuid in (?)"]
116 sql_params += [uuid_list]
119 # Link head points to this row, or to the owner of this row (the thing to be read)
121 # Link tail originates from this user, or a group that is readable by this
122 # user (the identity with authorization to read)
124 # Link class is 'permission' ('write' and 'manage' implicitly include 'read')
125 where(sql_conds.join(' OR '), *sql_params)
127 # At least one user is admin, so don't bother to apply any restrictions.
132 def logged_attributes
138 def ensure_ownership_path_leads_to_user
139 if new_record? or owner_uuid_changed?
140 uuid_in_path = {owner_uuid => true, uuid => true}
142 while (owner_class = self.class.resource_class_for_uuid(x)) != User
145 # Test for cycles with the new version, not the DB contents
147 elsif !owner_class.respond_to? :find_by_uuid
148 raise ActiveRecord::RecordNotFound.new
150 x = owner_class.find_by_uuid(x).owner_uuid
152 rescue ActiveRecord::RecordNotFound => e
153 errors.add :owner_uuid, "is not owned by any user: #{e}"
158 errors.add :owner_uuid, "would create an ownership cycle"
160 errors.add :owner_uuid, "has an ownership cycle"
164 uuid_in_path[x] = true
170 def ensure_owner_uuid_is_permitted
171 raise PermissionDeniedError if !current_user
172 self.owner_uuid ||= current_user.uuid
173 if self.owner_uuid_changed?
174 if current_user.uuid == self.owner_uuid or
175 current_user.can? write: self.owner_uuid
176 # current_user is, or has :write permission on, the new owner
178 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}"
179 raise PermissionDeniedError
184 elsif current_user.uuid == self.owner_uuid_was or
185 current_user.uuid == self.uuid or
186 current_user.can? write: self.owner_uuid_was
187 # current user is, or has :write permission on, the previous owner
190 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}"
191 raise PermissionDeniedError
195 def ensure_permission_to_save
196 unless (new_record? ? permission_to_create : permission_to_update)
197 raise PermissionDeniedError
201 def permission_to_create
202 current_user.andand.is_active
205 def permission_to_update
207 logger.warn "Anonymous user tried to update #{self.class.to_s} #{self.uuid_was}"
210 if !current_user.is_active
211 logger.warn "Inactive user #{current_user.uuid} tried to update #{self.class.to_s} #{self.uuid_was}"
214 return true if current_user.is_admin
215 if self.uuid_changed?
216 logger.warn "User #{current_user.uuid} tried to change uuid of #{self.class.to_s} #{self.uuid_was} to #{self.uuid}"
222 def ensure_permission_to_destroy
223 raise PermissionDeniedError unless permission_to_destroy
226 def permission_to_destroy
230 def maybe_update_modified_by_fields
231 update_modified_by_fields if self.changed? or self.new_record?
234 def update_modified_by_fields
235 self.updated_at = Time.now
236 self.owner_uuid ||= current_default_owner if self.respond_to? :owner_uuid=
237 self.modified_at = Time.now
238 self.modified_by_user_uuid = current_user ? current_user.uuid : nil
239 self.modified_by_client_uuid = current_api_client ? current_api_client.uuid : nil
242 def ensure_serialized_attribute_type
243 # Specifying a type in the "serialize" declaration causes rails to
244 # raise an exception if a different data type is retrieved from
245 # the database during load(). The validation preventing such
246 # crash-inducing records from being inserted in the database in
247 # the first place seems to have been left as an exercise to the
249 self.class.serialized_attributes.each do |colname, attr|
251 unless self.attributes[colname].is_a? attr.object_class
252 self.errors.add colname.to_sym, "must be a #{attr.object_class.to_s}"
258 def foreign_key_attributes
259 attributes.keys.select { |a| a.match /_uuid$/ }
262 def skip_uuid_read_permission_check
263 %w(modified_by_client_uuid)
266 def skip_uuid_existence_check
270 def normalize_collection_uuids
271 foreign_key_attributes.each do |attr|
272 attr_value = send attr
273 if attr_value.is_a? String and
274 attr_value.match /^[0-9a-f]{32,}(\+[@\w]+)*$/
276 send "#{attr}=", Collection.normalize_uuid(attr_value)
278 # TODO: abort instead of silently accepting unnormalizable value?
284 @@UUID_REGEX = /^[0-9a-z]{5}-([0-9a-z]{5})-[0-9a-z]{15}$/
286 @@prefixes_hash = nil
287 def self.uuid_prefixes
288 unless @@prefixes_hash
290 ActiveRecord::Base.descendants.reject(&:abstract_class?).each do |k|
291 if k.respond_to?(:uuid_prefix)
292 @@prefixes_hash[k.uuid_prefix] = k
299 def self.uuid_like_pattern
300 "_____-#{uuid_prefix}-_______________"
303 def ensure_valid_uuids
304 specials = [system_user_uuid, 'd41d8cd98f00b204e9800998ecf8427e+0']
306 foreign_key_attributes.each do |attr|
307 if new_record? or send (attr + "_changed?")
308 next if skip_uuid_existence_check.include? attr
309 attr_value = send attr
310 next if specials.include? attr_value
312 if (r = ArvadosModel::resource_class_for_uuid attr_value)
313 unless skip_uuid_read_permission_check.include? attr
314 r = r.readable_by(current_user)
316 if r.where(uuid: attr_value).count == 0
317 errors.add(attr, "'#{attr_value}' not found")
334 def self.readable_by (*u)
339 [{:uuid => u[:uuid]}]
343 def self.resource_class_for_uuid(uuid)
344 if uuid.is_a? ArvadosModel
347 unless uuid.is_a? String
350 if uuid.match /^[0-9a-f]{32}(\+[^,]+)*(,[0-9a-f]{32}(\+[^,]+)*)*$/
355 Rails.application.eager_load!
356 uuid.match @@UUID_REGEX do |re|
357 return uuid_prefixes[re[1]] if uuid_prefixes[re[1]]
360 if uuid.match /.+@.+/
369 @old_attributes = logged_attributes
372 def log_change(event_type)
373 log = Log.new(event_type: event_type).fill_object(self)
376 connection.execute "NOTIFY logs, '#{log.id}'"
381 log_change('create') do |log|
382 log.fill_properties('old', nil, nil)
388 log_change('update') do |log|
389 log.fill_properties('old', @old_etag, @old_attributes)
395 log_change('destroy') do |log|
396 log.fill_properties('old', @old_etag, @old_attributes)