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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2021 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package polkit
import (
"bytes"
"fmt"
"github.com/snapcore/snapd/interfaces"
"github.com/snapcore/snapd/polkit/validate"
"github.com/snapcore/snapd/snap"
)
type Policy []byte
type Rule []byte
// Specification keeps all the polkit policies.
type Specification struct {
policyFiles map[string]Policy
ruleFiles map[string]Rule
}
// AddPolicy adds a polkit policy file to install.
func (spec *Specification) AddPolicy(nameSuffix string, content Policy) error {
if old, ok := spec.policyFiles[nameSuffix]; ok && !bytes.Equal(old, content) {
return fmt.Errorf("internal error: polkit policy content for %q re-defined with different content", nameSuffix)
}
if spec.policyFiles == nil {
spec.policyFiles = make(map[string]Policy)
}
spec.policyFiles[nameSuffix] = content
return nil
}
// Policies returns a map of polkit policies added to the Specification.
func (spec *Specification) Policies() map[string]Policy {
if spec.policyFiles == nil {
return nil
}
result := make(map[string]Policy, len(spec.policyFiles))
for k, v := range spec.policyFiles {
result[k] = make(Policy, len(v))
copy(result[k], v)
}
return result
}
// AddRule adds a polkit rule file to install.
func (spec *Specification) AddRule(nameSuffix string, content Rule) error {
if err := validate.ValidateRuleNameSuffix(nameSuffix); err != nil {
return err
}
if old, ok := spec.ruleFiles[nameSuffix]; ok && !bytes.Equal(old, content) {
return fmt.Errorf("internal error: polkit rule content for %q re-defined with different content", nameSuffix)
}
if spec.ruleFiles == nil {
spec.ruleFiles = make(map[string]Rule)
}
spec.ruleFiles[nameSuffix] = content
return nil
}
// Rules returns a map of polkit rules added to the Specification.
// This maps from rule name suffixes (without the ".rules" suffix)
// to the content required to be installed.
func (spec *Specification) Rules() map[string]Rule {
if spec.ruleFiles == nil {
return nil
}
result := make(map[string]Rule, len(spec.ruleFiles))
for k, v := range spec.ruleFiles {
result[k] = make(Rule, len(v))
copy(result[k], v)
}
return result
}
// Implementation of methods required by interfaces.Specification
// AddConnectedPlug records polkit-specific side-effects of having a connected plug.
func (spec *Specification) AddConnectedPlug(iface interfaces.Interface, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
type definer interface {
PolkitConnectedPlug(spec *Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error
}
if iface, ok := iface.(definer); ok {
return iface.PolkitConnectedPlug(spec, plug, slot)
}
return nil
}
// AddConnectedSlot records polkit-specific side-effects of having a connected slot.
func (spec *Specification) AddConnectedSlot(iface interfaces.Interface, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
type definer interface {
PolkitConnectedSlot(spec *Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error
}
if iface, ok := iface.(definer); ok {
return iface.PolkitConnectedSlot(spec, plug, slot)
}
return nil
}
// AddPermanentPlug records polkit-specific side-effects of having a plug.
func (spec *Specification) AddPermanentPlug(iface interfaces.Interface, plug *snap.PlugInfo) error {
type definer interface {
PolkitPermanentPlug(spec *Specification, plug *snap.PlugInfo) error
}
if iface, ok := iface.(definer); ok {
return iface.PolkitPermanentPlug(spec, plug)
}
return nil
}
// AddPermanentSlot records polkit-specific side-effects of having a slot.
func (spec *Specification) AddPermanentSlot(iface interfaces.Interface, slot *snap.SlotInfo) error {
type definer interface {
PolkitPermanentSlot(spec *Specification, slot *snap.SlotInfo) error
}
if iface, ok := iface.(definer); ok {
return iface.PolkitPermanentSlot(spec, slot)
}
return nil
}
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