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 def self.kind_class(kind)
17 kind.match(/^arvados\#(.+?)(_list|List)?$/)[1].pluralize.classify.constantize rescue nil
20 def eager_load_associations
21 self.class.columns.each do |col|
22 re = col.name.match /^(.*)_kind$/
24 self.respond_to? re[1].to_sym and
25 (auuid = self.send((re[1] + '_uuid').to_sym)) and
26 (aclass = self.class.kind_class(self.send(col.name.to_sym))) and
27 (aobject = aclass.where('uuid=?', auuid).first))
28 self.instance_variable_set('@'+re[1], aobject)
35 def ensure_permission_to_create
36 raise "Permission denied" unless permission_to_create
39 def permission_to_create
43 def ensure_permission_to_update
44 raise "Permission denied" unless permission_to_update
47 def permission_to_update
49 logger.warn "Anonymous user tried to update #{self.class.to_s} #{self.uuid_was}"
53 logger.warn "User #{current_user.uuid} tried to change uuid of #{self.class.to_s} #{self.uuid_was} to #{self.uuid}"
56 return true if current_user.is_admin
57 if self.owner_changed?
58 if current_user.uuid == self.owner or
59 current_user.can? write: self.owner
60 # current_user is, or has :write permission on, the new owner
62 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}"
66 if current_user.uuid == self.owner_was or
67 current_user.uuid == self.uuid or
68 current_user.can? write: self.owner_was
69 # current user is, or has :write permission on, the previous owner
72 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}"
77 def maybe_update_modified_by_fields
78 update_modified_by_fields if self.changed?
81 def update_modified_by_fields
82 self.created_at ||= Time.now
83 self.owner ||= current_default_owner
84 self.modified_at = Time.now
85 self.modified_by_user = current_user ? current_user.uuid : nil
86 self.modified_by_client = current_api_client ? current_api_client.uuid : nil
89 def ensure_serialized_attribute_type
90 # Specifying a type in the "serialize" declaration causes rails to
91 # raise an exception if a different data type is retrieved from
92 # the database during load(). The validation preventing such
93 # crash-inducing records from being inserted in the database in
94 # the first place seems to have been left as an exercise to the
96 self.class.serialized_attributes.each do |colname, attr|
98 unless self.attributes[colname].is_a? attr.object_class
99 self.errors.add colname.to_sym, "must be a #{attr.object_class.to_s}"