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# frozen_string_literal: true
require_dependency 'declarative_policy'
class Ability
class << self
# Given a list of users and a project this method returns the users that can
# read the given project.
def users_that_can_read_project(users, project)
DeclarativePolicy.subject_scope do
users.select { |u| allowed?(u, :read_project, project) }
end
end
# Given a list of users and a group this method returns the users that can
# read the given group.
def users_that_can_read_group(users, group)
DeclarativePolicy.subject_scope do
users.select { |u| allowed?(u, :read_group, group) }
end
end
# Given a list of users and a snippet this method returns the users that can
# read the given snippet.
def users_that_can_read_personal_snippet(users, snippet)
DeclarativePolicy.subject_scope do
users.select { |u| allowed?(u, :read_snippet, snippet) }
end
end
# Returns an Array of Issues that can be read by the given user.
#
# issues - The issues to reduce down to those readable by the user.
# user - The User for which to check the issues
# filters - A hash of abilities and filters to apply if the user lacks this
# ability
def issues_readable_by_user(issues, user = nil, filters: {})
issues = apply_filters_if_needed(issues, user, filters)
DeclarativePolicy.user_scope do
issues.select { |issue| issue.visible_to_user?(user) }
end
end
# Returns an Array of MergeRequests that can be read by the given user.
#
# merge_requests - MRs out of which to collect MRs readable by the user.
# user - The User for which to check the merge_requests
# filters - A hash of abilities and filters to apply if the user lacks this
# ability
def merge_requests_readable_by_user(merge_requests, user = nil, filters: {})
merge_requests = apply_filters_if_needed(merge_requests, user, filters)
DeclarativePolicy.user_scope do
merge_requests.select { |mr| allowed?(user, :read_merge_request, mr) }
end
end
def allowed?(user, action, subject = :global, opts = {})
if subject.is_a?(Hash)
opts, subject = subject, :global
end
policy = policy_for(user, subject)
case opts[:scope]
when :user
DeclarativePolicy.user_scope { policy.can?(action) }
when :subject
DeclarativePolicy.subject_scope { policy.can?(action) }
else
policy.can?(action)
end
end
def policy_for(user, subject = :global)
cache = Gitlab::SafeRequestStore.active? ? Gitlab::SafeRequestStore : {}
DeclarativePolicy.policy_for(user, subject, cache: cache)
end
private
def apply_filters_if_needed(elements, user, filters)
filters.each do |ability, filter|
elements = filter.call(elements) unless allowed?(user, ability)
end
elements
end
end
end
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