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class Authorizer
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attr_accessor :user, :base_collection, :organization_ids, :location_ids
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def initialize(user, options = {})
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@cache = HashWithIndifferentAccess.new { |h, k| h[k] = HashWithIndifferentAccess.new }
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self.user = user
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self.base_collection = options.delete(:collection)
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end
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def can?(permission, subject = nil)
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if subject.nil?
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user.permissions.where(:name => permission).present?
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else
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return true if user.admin?
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collection = @cache[subject.class.to_s][permission] ||= find_collection(subject.class, :permission => permission)
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collection.include?(subject)
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end
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end
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def find_collection(resource_class, options = {})
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permission = options.delete :permission
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base = user.filters.joins(:permissions).where(["#{Permission.table_name}.resource_type = ?", resource_name(resource_class)])
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all_filters = permission.nil? ? base : base.where(["#{Permission.table_name}.name = ?", permission])
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organization_ids = allowed_organizations(resource_class)
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location_ids = allowed_locations(resource_class)
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organizations, locations, values = taxonomy_conditions(organization_ids, location_ids)
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all_filters = all_filters.joins(taxonomy_join).where(["#{TaxableTaxonomy.table_name}.id IS NULL " +
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"OR (#{organizations}) " +
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"OR (#{locations})",
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*values]).uniq
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all_filters = all_filters.all # load all records, so #empty? does not call extra COUNT(*) query
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return resource_class.where('1=0') if all_filters.empty?
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unless @base_collection.nil?
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if @base_collection.empty?
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return resource_class.where('1=0')
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else
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resource_class = resource_class.where(:id => base_ids)
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end
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end
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return resource_class.scoped if all_filters.any?(&:unlimited?)
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search_string = build_scoped_search_condition(all_filters.select(&:limited?))
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resource_class.search_for(search_string)
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end
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def build_scoped_search_condition(filters)
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raise ArgumentError if filters.blank?
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strings = filters.map { |f| "(#{f.search_condition.blank? ? '1=1' : f.search_condition})" }
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strings.join(' OR ')
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end
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private
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def allowed_organizations(resource_class)
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allowed_taxonomies(resource_class, 'organization')
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end
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def allowed_locations(resource_class)
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allowed_taxonomies(resource_class, 'location')
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end
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# return array of taxonomies that were used by default scope
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# if model does not support taxonomies, we return empty array indicating
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# we should not filter on taxonomies
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# otherwise we fetch it from model, if it's empty
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# for admin user we return empty array which means don't limit
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# for normal user we allow user taxonomies only
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def allowed_taxonomies(resource_class, type)
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taxonomy_ids = []
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if resource_class.respond_to?("used_#{type}_ids")
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taxonomy_ids = resource_class.send("used_#{type}_ids")
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if taxonomy_ids.empty? && !User.current.try(:admin?)
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taxonomy_ids = User.current.try("#{type}_ids")
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end
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end
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taxonomy_ids
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end
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def taxonomy_join
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"LEFT JOIN #{TaxableTaxonomy.table_name} ON " +
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"(#{Filter.table_name}.id = #{TaxableTaxonomy.table_name}.taxable_id AND taxable_type = 'Filter') " +
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"LEFT JOIN #{Taxonomy.table_name} ON " +
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"(#{Taxonomy.table_name}.id = #{TaxableTaxonomy.table_name}.taxonomy_id)"
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end
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def taxonomy_conditions(organization_ids, location_ids)
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values = []
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organizations = "#{Taxonomy.table_name}.type = ?"
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values.push 'Organization'
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unless organization_ids.empty?
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organizations += " AND #{Taxonomy.table_name}.id IN (?)"
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values.push organization_ids
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end
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locations = "#{Taxonomy.table_name}.type = ?"
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values.push 'Location'
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unless location_ids.empty?
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locations += " AND #{Taxonomy.table_name}.id IN (?)"
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values.push location_ids
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end
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return [organizations, locations, values]
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end
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# sometimes we need exceptions however we don't want to just split namespaces
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def resource_name(klass)
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return 'Operatingsystem' if klass <= Operatingsystem
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case name = klass.to_s
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when 'Audited::Adapters::ActiveRecord::Audit'
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'Audit'
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when /\AHost::.*\Z/
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'Host'
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when /\AForeman::Model::.*\Z/
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'ComputeResource'
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else
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name
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end
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end
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def base_ids
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raise ArgumentError, 'you must set base_collection to get base_ids' if @base_collection.nil?
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@base_ids ||= @base_collection.all? { |i| i.is_a?(Fixnum) } ? @base_collection : @base_collection.map(&:id)
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end
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end
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