1 class ArvadosModel < ActiveRecord::Base
2 self.abstract_class = true
4 include CurrentApiClient # current_user, current_api_client, etc.
6 attr_protected :created_at
7 attr_protected :modified_by_user
8 attr_protected :modified_by_client
9 attr_protected :modified_at
10 before_create :ensure_permission_to_create
11 before_update :ensure_permission_to_update
12 before_create :update_modified_by_fields
13 before_update :maybe_update_modified_by_fields
14 validate :ensure_serialized_attribute_type
16 has_many :permissions, :foreign_key => :head_uuid, :class_name => 'Link', :primary_key => :uuid, :conditions => "link_class = 'permission'"
18 class PermissionDeniedError < StandardError
21 def self.kind_class(kind)
22 kind.match(/^arvados\#(.+?)(_list|List)?$/)[1].pluralize.classify.constantize rescue nil
25 def eager_load_associations
26 self.class.columns.each do |col|
27 re = col.name.match /^(.*)_kind$/
29 self.respond_to? re[1].to_sym and
30 (auuid = self.send((re[1] + '_uuid').to_sym)) and
31 (aclass = self.class.kind_class(self.send(col.name.to_sym))) and
32 (aobject = aclass.where('uuid=?', auuid).first))
33 self.instance_variable_set('@'+re[1], aobject)
40 def ensure_permission_to_create
41 raise PermissionDeniedError unless permission_to_create
44 def permission_to_create
48 def ensure_permission_to_update
49 raise PermissionDeniedError unless permission_to_update
52 def permission_to_update
54 logger.warn "Anonymous user tried to update #{self.class.to_s} #{self.uuid_was}"
58 logger.warn "User #{current_user.uuid} tried to change uuid of #{self.class.to_s} #{self.uuid_was} to #{self.uuid}"
61 return true if current_user.is_admin
62 if self.owner_changed?
63 if current_user.uuid == self.owner or
64 current_user.can? write: self.owner
65 # current_user is, or has :write permission on, the new owner
67 logger.warn "User #{current_user.uuid} tried to change owner of #{self.class.to_s} #{self.uuid} to #{self.owner} but does not have permission to write to #{self.owner}"
71 if current_user.uuid == self.owner_was or
72 current_user.uuid == self.uuid or
73 current_user.can? write: self.owner_was
74 # current user is, or has :write permission on, the previous owner
77 logger.warn "User #{current_user.uuid} tried to modify #{self.class.to_s} #{self.uuid} but does not have permission to write #{self.owner_was}"
82 def maybe_update_modified_by_fields
83 update_modified_by_fields if self.changed?
86 def update_modified_by_fields
87 self.created_at ||= Time.now
88 self.owner ||= current_default_owner
89 self.modified_at = Time.now
90 self.modified_by_user = current_user ? current_user.uuid : nil
91 self.modified_by_client = current_api_client ? current_api_client.uuid : nil
94 def ensure_serialized_attribute_type
95 # Specifying a type in the "serialize" declaration causes rails to
96 # raise an exception if a different data type is retrieved from
97 # the database during load(). The validation preventing such
98 # crash-inducing records from being inserted in the database in
99 # the first place seems to have been left as an exercise to the
101 self.class.serialized_attributes.each do |colname, attr|
103 unless self.attributes[colname].is_a? attr.object_class
104 self.errors.add colname.to_sym, "must be a #{attr.object_class.to_s}"