2 require 'record_filters'
5 class ArvadosModel < ActiveRecord::Base
6 self.abstract_class = true
8 include CurrentApiClient # current_user, current_api_client, etc.
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 after_find :convert_serialized_symbols_to_strings
24 before_validation :normalize_collection_uuids
25 before_validation :set_default_owner
26 validate :ensure_valid_uuids
28 # Note: This only returns permission links. It does not account for
29 # permissions obtained via user.is_admin or
30 # user.uuid==object.owner_uuid.
31 has_many(:permissions,
32 ->{where(link_class: 'permission')},
33 foreign_key: :head_uuid,
37 class PermissionDeniedError < StandardError
43 class AlreadyLockedError < StandardError
49 class LockFailedError < StandardError
55 class InvalidStateTransitionError < StandardError
61 class UnauthorizedError < StandardError
67 class UnresolvableContainerError < StandardError
73 def self.kind_class(kind)
74 kind.match(/^arvados\#(.+)$/)[1].classify.safe_constantize rescue nil
78 "#{current_api_base}/#{self.class.to_s.pluralize.underscore}/#{self.uuid}"
81 def self.permit_attribute_params raw_params
82 # strong_parameters does not provide security: permissions are
83 # implemented with before_save hooks.
85 # The following permit! is necessary even with
86 # "ActionController::Parameters.permit_all_parameters = true",
87 # because permit_all does not permit nested attributes.
89 serialized_attributes.each do |colname, coder|
90 param = raw_params[colname.to_sym]
93 elsif !param.is_a?(coder.object_class)
94 raise ArgumentError.new("#{colname} parameter must be #{coder.object_class}, not #{param.class}")
95 elsif has_nonstring_keys?(param)
96 raise ArgumentError.new("#{colname} parameter cannot have non-string hash keys")
100 ActionController::Parameters.new(raw_params).permit!
103 def initialize raw_params={}, *args
104 super(self.class.permit_attribute_params(raw_params), *args)
107 # Reload "old attributes" for logging, too.
113 def self.create raw_params={}, *args
114 super(permit_attribute_params(raw_params), *args)
117 def update_attributes raw_params={}, *args
118 super(self.class.permit_attribute_params(raw_params), *args)
121 def self.selectable_attributes(template=:user)
122 # Return an array of attribute name strings that can be selected
123 # in the given template.
124 api_accessible_attributes(template).map { |attr_spec| attr_spec.first.to_s }
127 def self.searchable_columns operator
128 textonly_operator = !operator.match(/[<=>]/)
129 self.columns.select do |col|
133 when :datetime, :integer, :boolean
141 def self.attribute_column attr
142 self.columns.select { |col| col.name == attr.to_s }.first
145 def self.attributes_required_columns
146 # This method returns a hash. Each key is the name of an API attribute,
147 # and it's mapped to a list of database columns that must be fetched
148 # to generate that attribute.
149 # This implementation generates a simple map of attributes to
150 # matching column names. Subclasses can override this method
151 # to specify that method-backed API attributes need to fetch
152 # specific columns from the database.
153 all_columns = columns.map(&:name)
154 api_column_map = Hash.new { |hash, key| hash[key] = [] }
155 methods.grep(/^api_accessible_\w+$/).each do |method_name|
156 next if method_name == :api_accessible_attributes
157 send(method_name).each_pair do |api_attr_name, col_name|
158 col_name = col_name.to_s
159 if all_columns.include?(col_name)
160 api_column_map[api_attr_name.to_s] |= [col_name]
167 def self.ignored_select_attributes
168 ["href", "kind", "etag"]
171 def self.columns_for_attributes(select_attributes)
172 if select_attributes.empty?
173 raise ArgumentError.new("Attribute selection list cannot be empty")
175 api_column_map = attributes_required_columns
177 select_attributes.each do |s|
178 next if ignored_select_attributes.include? s
179 if not s.is_a? String or not api_column_map.include? s
183 if not invalid_attrs.empty?
184 raise ArgumentError.new("Invalid attribute(s): #{invalid_attrs.inspect}")
186 # Given an array of attribute names to select, return an array of column
187 # names that must be fetched from the database to satisfy the request.
188 select_attributes.flat_map { |attr| api_column_map[attr] }.uniq
191 def self.default_orders
192 ["#{table_name}.modified_at desc", "#{table_name}.uuid"]
195 def self.unique_columns
199 def self.limit_index_columns_read
200 # This method returns a list of column names.
201 # If an index request reads that column from the database,
202 # APIs that return lists will only fetch objects until reaching
203 # max_index_database_read bytes of data from those columns.
207 # If current user can manage the object, return an array of uuids of
208 # users and groups that have permission to write the object. The
209 # first two elements are always [self.owner_uuid, current user's
212 # If current user can write but not manage the object, return
213 # [self.owner_uuid, current user's uuid].
215 # If current user cannot write this object, just return
218 return [owner_uuid] if not current_user
219 unless (owner_uuid == current_user.uuid or
220 current_user.is_admin or
221 (current_user.groups_i_can(:manage) & [uuid, owner_uuid]).any?)
222 if ((current_user.groups_i_can(:write) + [current_user.uuid]) &
223 [uuid, owner_uuid]).any?
224 return [owner_uuid, current_user.uuid]
229 [owner_uuid, current_user.uuid] + permissions.collect do |p|
230 if ['can_write', 'can_manage'].index p.name
236 # Return a query with read permissions restricted to the union of of the
237 # permissions of the members of users_list, i.e. if something is readable by
238 # any user in users_list, it will be readable in the query returned by this
240 def self.readable_by(*users_list)
241 # Get rid of troublesome nils
244 # Load optional keyword arguments, if they exist.
245 if users_list.last.is_a? Hash
246 kwargs = users_list.pop
251 # Check if any of the users are admin. If so, we're done.
252 if users_list.select { |u| u.is_admin }.any?
253 # Return existing relation with no new filters.
257 # Collect the UUIDs of the authorized users.
258 user_uuids = users_list.map { |u| u.uuid }
260 # Collect the UUIDs of all groups readable by any of the
261 # authorized users. If one of these (or the UUID of one of the
262 # authorized users themselves) is an object's owner_uuid, that
263 # object is readable.
264 owner_uuids = user_uuids + users_list.flat_map { |u| u.groups_i_can(:read) }
268 sql_table = kwargs.fetch(:table_name, table_name)
270 # Match any object (evidently a group or user) whose UUID is
271 # listed explicitly in owner_uuids.
272 sql_conds += ["#{sql_table}.uuid in (:owner_uuids)"]
274 # Match any object whose owner is listed explicitly in
276 sql_conds += ["#{sql_table}.owner_uuid IN (:owner_uuids)"]
278 # Match the head of any permission link whose tail is listed
279 # explicitly in owner_uuids.
280 sql_conds += ["#{sql_table}.uuid IN (SELECT head_uuid FROM links WHERE link_class='permission' AND tail_uuid IN (:owner_uuids))"]
282 if sql_table == "links"
283 # Match any permission link that gives one of the authorized
284 # users some permission _or_ gives anyone else permission to
285 # view one of the authorized users.
286 sql_conds += ["(#{sql_table}.link_class in (:permission_link_classes) AND "+
287 "(#{sql_table}.head_uuid IN (:user_uuids) OR #{sql_table}.tail_uuid IN (:user_uuids)))"]
290 where(sql_conds.join(' OR '),
291 owner_uuids: owner_uuids,
292 user_uuids: user_uuids,
293 permission_link_classes: ['permission', 'resources'])
296 def save_with_unique_name!
301 conn = ActiveRecord::Base.connection
302 conn.exec_query 'SAVEPOINT save_with_unique_name'
305 rescue ActiveRecord::RecordNotUnique => rn
306 raise if max_retries == 0
309 conn.exec_query 'ROLLBACK TO SAVEPOINT save_with_unique_name'
311 # Dig into the error to determine if it is specifically calling out a
312 # (owner_uuid, name) uniqueness violation. In this specific case, and
313 # the client requested a unique name with ensure_unique_name==true,
314 # update the name field and try to save again. Loop as necessary to
315 # discover a unique name. It is necessary to handle name choosing at
316 # this level (as opposed to the client) to ensure that record creation
317 # never fails due to a race condition.
318 err = rn.original_exception
319 raise unless err.is_a?(PG::UniqueViolation)
321 # Unfortunately ActiveRecord doesn't abstract out any of the
322 # necessary information to figure out if this the error is actually
323 # the specific case where we want to apply the ensure_unique_name
324 # behavior, so the following code is specialized to Postgres.
325 detail = err.result.error_field(PG::Result::PG_DIAG_MESSAGE_DETAIL)
326 raise unless /^Key \(owner_uuid, name\)=\([a-z0-9]{5}-[a-z0-9]{5}-[a-z0-9]{15}, .*?\) already exists\./.match detail
328 new_name = "#{name_was} (#{db_current_time.utc.iso8601(3)})"
330 # If the database is fast enough to do two attempts in the
331 # same millisecond, we need to wait to ensure we try a
332 # different timestamp on each attempt.
334 new_name = "#{name_was} (#{db_current_time.utc.iso8601(3)})"
337 self[:name] = new_name
338 self[:uuid] = nil if uuid_was.nil? && !uuid.nil?
339 conn.exec_query 'SAVEPOINT save_with_unique_name'
342 conn.exec_query 'RELEASE SAVEPOINT save_with_unique_name'
347 def logged_attributes
348 attributes.except(*Rails.configuration.unlogged_attributes)
351 def self.full_text_searchable_columns
352 self.columns.select do |col|
353 col.type == :string or col.type == :text
357 def self.full_text_tsvector
358 parts = full_text_searchable_columns.collect do |column|
359 "coalesce(#{column},'')"
361 "to_tsvector('english', #{parts.join(" || ' ' || ")})"
364 def self.apply_filters query, filters
365 ft = record_filters filters, self
366 if not ft[:cond_out].any?
369 query.where('(' + ft[:cond_out].join(') AND (') + ')',
375 def self.deep_sort_hash(x)
377 x.sort.collect do |k, v|
378 [k, deep_sort_hash(v)]
381 x.collect { |v| deep_sort_hash(v) }
387 def ensure_ownership_path_leads_to_user
388 if new_record? or owner_uuid_changed?
389 uuid_in_path = {owner_uuid => true, uuid => true}
391 while (owner_class = ArvadosModel::resource_class_for_uuid(x)) != User
394 # Test for cycles with the new version, not the DB contents
396 elsif !owner_class.respond_to? :find_by_uuid
397 raise ActiveRecord::RecordNotFound.new
399 x = owner_class.find_by_uuid(x).owner_uuid
401 rescue ActiveRecord::RecordNotFound => e
402 errors.add :owner_uuid, "is not owned by any user: #{e}"
407 errors.add :owner_uuid, "would create an ownership cycle"
409 errors.add :owner_uuid, "has an ownership cycle"
413 uuid_in_path[x] = true
419 def set_default_owner
420 if new_record? and current_user and respond_to? :owner_uuid=
421 self.owner_uuid ||= current_user.uuid
425 def ensure_owner_uuid_is_permitted
426 raise PermissionDeniedError if !current_user
428 if self.owner_uuid.nil?
429 errors.add :owner_uuid, "cannot be nil"
430 raise PermissionDeniedError
433 rsc_class = ArvadosModel::resource_class_for_uuid owner_uuid
434 unless rsc_class == User or rsc_class == Group
435 errors.add :owner_uuid, "must be set to User or Group"
436 raise PermissionDeniedError
439 if new_record? || owner_uuid_changed?
440 # Permission on owner_uuid_was is needed to move an existing
441 # object away from its previous owner (which implies permission
442 # to modify this object itself, so we don't need to check that
443 # separately). Permission on the new owner_uuid is also needed.
444 [['old', owner_uuid_was],
446 ].each do |which, check_uuid|
448 # old_owner_uuid is nil? New record, no need to check.
449 elsif !current_user.can?(write: check_uuid)
450 logger.warn "User #{current_user.uuid} tried to set ownership of #{self.class.to_s} #{self.uuid} but does not have permission to write #{which} owner_uuid #{check_uuid}"
451 errors.add :owner_uuid, "cannot be set or changed without write permission on #{which} owner"
452 raise PermissionDeniedError
456 # If the object already existed and we're not changing
457 # owner_uuid, we only need write permission on the object
459 if !current_user.can?(write: self.uuid)
460 logger.warn "User #{current_user.uuid} tried to modify #{self.class.to_s} #{self.uuid} without write permission"
461 errors.add :uuid, "is not writable"
462 raise PermissionDeniedError
469 def ensure_permission_to_save
470 unless (new_record? ? permission_to_create : permission_to_update)
471 raise PermissionDeniedError
475 def permission_to_create
476 current_user.andand.is_active
479 def permission_to_update
481 logger.warn "Anonymous user tried to update #{self.class.to_s} #{self.uuid_was}"
484 if !current_user.is_active
485 logger.warn "Inactive user #{current_user.uuid} tried to update #{self.class.to_s} #{self.uuid_was}"
488 return true if current_user.is_admin
489 if self.uuid_changed?
490 logger.warn "User #{current_user.uuid} tried to change uuid of #{self.class.to_s} #{self.uuid_was} to #{self.uuid}"
496 def ensure_permission_to_destroy
497 raise PermissionDeniedError unless permission_to_destroy
500 def permission_to_destroy
504 def maybe_update_modified_by_fields
505 update_modified_by_fields if self.changed? or self.new_record?
509 def update_modified_by_fields
510 current_time = db_current_time
511 self.created_at = created_at_was || current_time
512 self.updated_at = current_time
513 self.owner_uuid ||= current_default_owner if self.respond_to? :owner_uuid=
514 self.modified_at = current_time
515 self.modified_by_user_uuid = current_user ? current_user.uuid : nil
516 self.modified_by_client_uuid = current_api_client ? current_api_client.uuid : nil
520 def self.has_nonstring_keys? x
523 return true if !(k.is_a?(String) || k.is_a?(Symbol)) || has_nonstring_keys?(v)
527 return true if has_nonstring_keys?(v)
533 def self.has_symbols? x
536 return true if has_symbols?(k) or has_symbols?(v)
540 return true if has_symbols?(k)
545 return true if x.start_with?(':') && !x.start_with?('::')
550 def self.recursive_stringify x
552 Hash[x.collect do |k,v|
553 [recursive_stringify(k), recursive_stringify(v)]
557 recursive_stringify k
561 elsif x.is_a? String and x.start_with?(':') and !x.start_with?('::')
568 def self.where_serialized(colname, value)
570 # rails4 stores as null, rails3 stored as serialized [] or {}
571 sql = "#{colname.to_s} is null or #{colname.to_s} IN (?)"
574 sql = "#{colname.to_s} IN (?)"
575 sorted = deep_sort_hash(value)
577 where(sql, [sorted.to_yaml, SafeJSON.dump(sorted)])
581 Hash => HashSerializer,
582 Array => ArraySerializer,
585 def self.serialize(colname, type)
586 coder = Serializer[type]
587 @serialized_attributes ||= {}
588 @serialized_attributes[colname.to_s] = coder
589 super(colname, coder)
592 def self.serialized_attributes
593 @serialized_attributes ||= {}
596 def serialized_attributes
597 self.class.serialized_attributes
600 def convert_serialized_symbols_to_strings
601 # ensure_serialized_attribute_type should prevent symbols from
602 # getting into the database in the first place. If someone managed
603 # to get them into the database (perhaps using an older version)
604 # we'll convert symbols to strings when loading from the
605 # database. (Otherwise, loading and saving an object with existing
606 # symbols in a serialized field will crash.)
607 self.class.serialized_attributes.each do |colname, attr|
608 if self.class.has_symbols? attributes[colname]
609 attributes[colname] = self.class.recursive_stringify attributes[colname]
611 self.class.recursive_stringify(attributes[colname]))
616 def foreign_key_attributes
617 attributes.keys.select { |a| a.match(/_uuid$/) }
620 def skip_uuid_read_permission_check
621 %w(modified_by_client_uuid)
624 def skip_uuid_existence_check
628 def normalize_collection_uuids
629 foreign_key_attributes.each do |attr|
630 attr_value = send attr
631 if attr_value.is_a? String and
632 attr_value.match(/^[0-9a-f]{32,}(\+[@\w]+)*$/)
634 send "#{attr}=", Collection.normalize_uuid(attr_value)
636 # TODO: abort instead of silently accepting unnormalizable value?
642 @@prefixes_hash = nil
643 def self.uuid_prefixes
644 unless @@prefixes_hash
646 Rails.application.eager_load!
647 ActiveRecord::Base.descendants.reject(&:abstract_class?).each do |k|
648 if k.respond_to?(:uuid_prefix)
649 @@prefixes_hash[k.uuid_prefix] = k
656 def self.uuid_like_pattern
657 "#{Rails.configuration.uuid_prefix}-#{uuid_prefix}-_______________"
661 %r/[a-z0-9]{5}-#{uuid_prefix}-[a-z0-9]{15}/
664 def ensure_valid_uuids
665 specials = [system_user_uuid]
667 foreign_key_attributes.each do |attr|
668 if new_record? or send (attr + "_changed?")
669 next if skip_uuid_existence_check.include? attr
670 attr_value = send attr
671 next if specials.include? attr_value
673 if (r = ArvadosModel::resource_class_for_uuid attr_value)
674 unless skip_uuid_read_permission_check.include? attr
675 r = r.readable_by(current_user)
677 if r.where(uuid: attr_value).count == 0
678 errors.add(attr, "'#{attr_value}' not found")
695 def self.readable_by (*u)
700 [{:uuid => u[:uuid]}]
704 def self.resource_class_for_uuid(uuid)
705 if uuid.is_a? ArvadosModel
708 unless uuid.is_a? String
712 uuid.match HasUuid::UUID_REGEX do |re|
713 return uuid_prefixes[re[1]] if uuid_prefixes[re[1]]
716 if uuid.match(/.+@.+/)
723 # ArvadosModel.find_by_uuid needs extra magic to allow it to return
724 # an object in any class.
725 def self.find_by_uuid uuid
726 if self == ArvadosModel
727 # If called directly as ArvadosModel.find_by_uuid rather than via subclass,
728 # delegate to the appropriate subclass based on the given uuid.
729 self.resource_class_for_uuid(uuid).unscoped.find_by_uuid(uuid)
736 @old_attributes = Marshal.load(Marshal.dump(attributes))
737 @old_logged_attributes = Marshal.load(Marshal.dump(logged_attributes))
740 def log_change(event_type)
741 log = Log.new(event_type: event_type).fill_object(self)
748 log_change('create') do |log|
749 log.fill_properties('old', nil, nil)
755 log_change('update') do |log|
756 log.fill_properties('old', etag(@old_attributes), @old_logged_attributes)
762 log_change('delete') do |log|
763 log.fill_properties('old', etag(@old_attributes), @old_logged_attributes)