-require 'assign_uuid'
+require 'has_uuid'
+
class ArvadosModel < ActiveRecord::Base
self.abstract_class = true
attr_protected :modified_by_client_uuid
attr_protected :modified_at
after_initialize :log_start_state
- before_create :ensure_permission_to_create
- before_update :ensure_permission_to_update
+ before_save :ensure_permission_to_save
+ before_save :ensure_owner_uuid_is_permitted
+ before_save :ensure_ownership_path_leads_to_user
+ before_destroy :ensure_owner_uuid_is_permitted
before_destroy :ensure_permission_to_destroy
-
before_create :update_modified_by_fields
before_update :maybe_update_modified_by_fields
after_create :log_create
after_update :log_update
after_destroy :log_destroy
+ after_find :convert_serialized_symbols_to_strings
validate :ensure_serialized_attribute_type
validate :normalize_collection_uuids
validate :ensure_valid_uuids
+ # Note: This only returns permission links. It does not account for
+ # permissions obtained via user.is_admin or
+ # user.uuid==object.owner_uuid.
has_many :permissions, :foreign_key => :head_uuid, :class_name => 'Link', :primary_key => :uuid, :conditions => "link_class = 'permission'"
class PermissionDeniedError < StandardError
self.columns.select { |col| col.name == attr.to_s }.first
end
+ # Return nil if current user is not allowed to see the list of
+ # writers. Otherwise, return a list of user_ and group_uuids with
+ # write permission. (If not returning nil, current_user is always in
+ # the list because can_manage permission is needed to see the list
+ # of writers.)
+ def writable_by
+ unless (owner_uuid == current_user.uuid or
+ current_user.is_admin or
+ current_user.groups_i_can(:manage).index(owner_uuid))
+ return nil
+ end
+ [owner_uuid, current_user.uuid] + permissions.collect do |p|
+ if ['can_write', 'can_manage'].index p.name
+ p.tail_uuid
+ end
+ end.compact.uniq
+ end
+
# Return a query with read permissions restricted to the union of of the
# permissions of the members of users_list, i.e. if something is readable by
# any user in users_list, it will be readable in the query returned by this
# Get rid of troublesome nils
users_list.compact!
+ # Load optional keyword arguments, if they exist.
+ if users_list.last.is_a? Hash
+ kwargs = users_list.pop
+ else
+ kwargs = {}
+ end
+
# Check if any of the users are admin. If so, we're done.
if users_list.select { |u| u.is_admin }.empty?
collect { |uuid| sanitize(uuid) }.join(', ')
sql_conds = []
sql_params = []
+ sql_table = kwargs.fetch(:table_name, table_name)
or_object_uuid = ''
# This row is owned by a member of users_list, or owned by a group
# A permission link exists ('write' and 'manage' implicitly include
# 'read') from a member of users_list, or a group readable by users_list,
# to this row, or to the owner of this row (see join() below).
- sql_conds += ["#{table_name}.owner_uuid in (?)",
- "#{table_name}.uuid in (?)",
- "permissions.head_uuid IS NOT NULL"]
+ permitted_uuids = "(SELECT head_uuid FROM links WHERE link_class='permission' AND tail_uuid IN (#{sanitized_uuid_list}))"
+
+ sql_conds += ["#{sql_table}.owner_uuid in (?)",
+ "#{sql_table}.uuid in (?)",
+ "#{sql_table}.uuid IN #{permitted_uuids}"]
sql_params += [uuid_list, user_uuids]
- if self == Link and users_list.any?
+ if sql_table == "links" and users_list.any?
# This row is a 'permission' or 'resources' link class
# The uuid for a member of users_list is referenced in either the head
# or tail of the link
- sql_conds += ["(#{table_name}.link_class in (#{sanitize 'permission'}, #{sanitize 'resources'}) AND (#{table_name}.head_uuid IN (?) OR #{table_name}.tail_uuid IN (?)))"]
+ sql_conds += ["(#{sql_table}.link_class in (#{sanitize 'permission'}, #{sanitize 'resources'}) AND (#{sql_table}.head_uuid IN (?) OR #{sql_table}.tail_uuid IN (?)))"]
sql_params += [user_uuids, user_uuids]
end
- if self == Log and users_list.any?
+ if sql_table == "logs" and users_list.any?
# Link head points to the object described by this row
- or_object_uuid = ", #{table_name}.object_uuid"
+ sql_conds += ["#{sql_table}.object_uuid IN #{permitted_uuids}"]
# This object described by this row is owned by this user, or owned by a group readable by this user
- sql_conds += ["#{table_name}.object_owner_uuid in (?)"]
+ sql_conds += ["#{sql_table}.object_owner_uuid in (?)"]
sql_params += [uuid_list]
end
# user (the identity with authorization to read)
#
# Link class is 'permission' ('write' and 'manage' implicitly include 'read')
-
- joins("LEFT JOIN links permissions ON permissions.head_uuid in (#{table_name}.owner_uuid, #{table_name}.uuid #{or_object_uuid}) AND permissions.tail_uuid in (#{sanitized_uuid_list}) AND permissions.link_class='permission'")
- .where(sql_conds.join(' OR '), *sql_params).uniq
-
+ where(sql_conds.join(' OR '), *sql_params)
else
# At least one user is admin, so don't bother to apply any restrictions.
self
end
-
end
def logged_attributes
protected
- def ensure_permission_to_create
- raise PermissionDeniedError unless permission_to_create
+ def ensure_ownership_path_leads_to_user
+ if new_record? or owner_uuid_changed?
+ uuid_in_path = {owner_uuid => true, uuid => true}
+ x = owner_uuid
+ while (owner_class = self.class.resource_class_for_uuid(x)) != User
+ begin
+ if x == uuid
+ # Test for cycles with the new version, not the DB contents
+ x = owner_uuid
+ elsif !owner_class.respond_to? :find_by_uuid
+ raise ActiveRecord::RecordNotFound.new
+ else
+ x = owner_class.find_by_uuid(x).owner_uuid
+ end
+ rescue ActiveRecord::RecordNotFound => e
+ errors.add :owner_uuid, "is not owned by any user: #{e}"
+ return false
+ end
+ if uuid_in_path[x]
+ if x == owner_uuid
+ errors.add :owner_uuid, "would create an ownership cycle"
+ else
+ errors.add :owner_uuid, "has an ownership cycle"
+ end
+ return false
+ end
+ uuid_in_path[x] = true
+ end
+ end
+ true
end
- def permission_to_create
- current_user.andand.is_active
+ def ensure_owner_uuid_is_permitted
+ raise PermissionDeniedError if !current_user
+ if respond_to? :owner_uuid=
+ self.owner_uuid ||= current_user.uuid
+ end
+ if self.owner_uuid_changed?
+ if new_record?
+ return true
+ elsif current_user.uuid == self.owner_uuid or
+ current_user.can? write: self.owner_uuid
+ # current_user is, or has :write permission on, the new owner
+ else
+ 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}"
+ raise PermissionDeniedError
+ end
+ end
+ if new_record?
+ return true
+ elsif current_user.uuid == self.owner_uuid_was or
+ current_user.uuid == self.uuid or
+ current_user.can? write: self.owner_uuid_was
+ # current user is, or has :write permission on, the previous owner
+ return true
+ else
+ 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}"
+ raise PermissionDeniedError
+ end
end
- def ensure_permission_to_update
- raise PermissionDeniedError unless permission_to_update
+ def ensure_permission_to_save
+ unless (new_record? ? permission_to_create : permission_to_update)
+ raise PermissionDeniedError
+ end
+ end
+
+ def permission_to_create
+ current_user.andand.is_active
end
def permission_to_update
logger.warn "User #{current_user.uuid} tried to change uuid of #{self.class.to_s} #{self.uuid_was} to #{self.uuid}"
return false
end
- if self.owner_uuid_changed?
- if current_user.uuid == self.owner_uuid or
- current_user.can? write: self.owner_uuid
- # current_user is, or has :write permission on, the new owner
- else
- 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}"
- return false
- end
- end
- if current_user.uuid == self.owner_uuid_was or
- current_user.uuid == self.uuid or
- current_user.can? write: self.owner_uuid_was
- # current user is, or has :write permission on, the previous owner
- return true
- else
- 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}"
- return false
- end
+ return true
end
def ensure_permission_to_destroy
def maybe_update_modified_by_fields
update_modified_by_fields if self.changed? or self.new_record?
+ true
end
def update_modified_by_fields
self.modified_at = Time.now
self.modified_by_user_uuid = current_user ? current_user.uuid : nil
self.modified_by_client_uuid = current_api_client ? current_api_client.uuid : nil
+ true
+ end
+
+ def self.has_symbols? x
+ if x.is_a? Hash
+ x.each do |k,v|
+ return true if has_symbols?(k) or has_symbols?(v)
+ end
+ false
+ elsif x.is_a? Array
+ x.each do |k|
+ return true if has_symbols?(k)
+ end
+ false
+ else
+ (x.class == Symbol)
+ end
+ end
+
+ def self.recursive_stringify x
+ if x.is_a? Hash
+ Hash[x.collect do |k,v|
+ [recursive_stringify(k), recursive_stringify(v)]
+ end]
+ elsif x.is_a? Array
+ x.collect do |k|
+ recursive_stringify k
+ end
+ elsif x.is_a? Symbol
+ x.to_s
+ else
+ x
+ end
end
def ensure_serialized_attribute_type
# developer.
self.class.serialized_attributes.each do |colname, attr|
if attr.object_class
- unless self.attributes[colname].is_a? attr.object_class
- self.errors.add colname.to_sym, "must be a #{attr.object_class.to_s}"
+ if self.attributes[colname].class != attr.object_class
+ self.errors.add colname.to_sym, "must be a #{attr.object_class.to_s}, not a #{self.attributes[colname].class.to_s}"
+ elsif self.class.has_symbols? attributes[colname]
+ self.errors.add colname.to_sym, "must not contain symbols: #{attributes[colname].inspect}"
end
end
end
end
+ def convert_serialized_symbols_to_strings
+ # ensure_serialized_attribute_type should prevent symbols from
+ # getting into the database in the first place. If someone managed
+ # to get them into the database (perhaps using an older version)
+ # we'll convert symbols to strings when loading from the
+ # database. (Otherwise, loading and saving an object with existing
+ # symbols in a serialized field will crash.)
+ self.class.serialized_attributes.each do |colname, attr|
+ if self.class.has_symbols? attributes[colname]
+ attributes[colname] = self.class.recursive_stringify attributes[colname]
+ self.send(colname + '=',
+ self.class.recursive_stringify(attributes[colname]))
+ end
+ end
+ end
+
def foreign_key_attributes
attributes.keys.select { |a| a.match /_uuid$/ }
end
projects / arvados.git / blobdiff