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// Copyright (C) 2018 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package apex
import (
"fmt"
"android/soong/android"
"github.com/google/blueprint/proptools"
)
var String = proptools.String
func init() {
registerApexKeyBuildComponents(android.InitRegistrationContext)
}
func registerApexKeyBuildComponents(ctx android.RegistrationContext) {
ctx.RegisterModuleType("apex_key", ApexKeyFactory)
}
type apexKey struct {
android.ModuleBase
properties apexKeyProperties
publicKeyFile android.Path
privateKeyFile android.Path
}
type apexKeyProperties struct {
// Path or module to the public key file in avbpubkey format. Installed to the device.
// Base name of the file is used as the ID for the key.
Public_key *string `android:"path"`
// Path or module to the private key file in pem format. Used to sign APEXs.
Private_key *string `android:"path"`
// Whether this key is installable to one of the partitions. Defualt: true.
Installable *bool
}
func ApexKeyFactory() android.Module {
module := &apexKey{}
module.AddProperties(&module.properties)
android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibCommon)
return module
}
func (m *apexKey) installable() bool {
return false
}
func (m *apexKey) GenerateAndroidBuildActions(ctx android.ModuleContext) {
// If the keys are from other modules (i.e. :module syntax) respect it.
// Otherwise, try to locate the key files in the default cert dir or
// in the local module dir
if android.SrcIsModule(String(m.properties.Public_key)) != "" {
m.publicKeyFile = android.PathForModuleSrc(ctx, String(m.properties.Public_key))
} else {
m.publicKeyFile = ctx.Config().ApexKeyDir(ctx).Join(ctx, String(m.properties.Public_key))
// If not found, fall back to the local key pairs
if !android.ExistentPathForSource(ctx, m.publicKeyFile.String()).Valid() {
m.publicKeyFile = android.PathForModuleSrc(ctx, String(m.properties.Public_key))
}
}
if android.SrcIsModule(String(m.properties.Private_key)) != "" {
m.privateKeyFile = android.PathForModuleSrc(ctx, String(m.properties.Private_key))
} else {
m.privateKeyFile = ctx.Config().ApexKeyDir(ctx).Join(ctx, String(m.properties.Private_key))
if !android.ExistentPathForSource(ctx, m.privateKeyFile.String()).Valid() {
m.privateKeyFile = android.PathForModuleSrc(ctx, String(m.properties.Private_key))
}
}
pubKeyName := m.publicKeyFile.Base()[0 : len(m.publicKeyFile.Base())-len(m.publicKeyFile.Ext())]
privKeyName := m.privateKeyFile.Base()[0 : len(m.privateKeyFile.Base())-len(m.privateKeyFile.Ext())]
if m.properties.Public_key != nil && m.properties.Private_key != nil && pubKeyName != privKeyName {
ctx.ModuleErrorf("public_key %q (keyname:%q) and private_key %q (keyname:%q) do not have same keyname",
m.publicKeyFile.String(), pubKeyName, m.privateKeyFile, privKeyName)
return
}
}
type apexKeyEntry struct {
name string
presigned bool
publicKey string
privateKey string
containerCertificate string
containerPrivateKey string
partition string
signTool string
}
func (e apexKeyEntry) String() string {
signTool := ""
if e.signTool != "" {
signTool = fmt.Sprintf(" sign_tool=%q", e.signTool)
}
format := "name=%q public_key=%q private_key=%q container_certificate=%q container_private_key=%q partition=%q%s\n"
if e.presigned {
return fmt.Sprintf(format, e.name, "PRESIGNED", "PRESIGNED", "PRESIGNED", "PRESIGNED", e.partition, signTool)
} else {
return fmt.Sprintf(format, e.name, e.publicKey, e.privateKey, e.containerCertificate, e.containerPrivateKey, e.partition, signTool)
}
}
func apexKeyEntryFor(ctx android.ModuleContext, module android.Module) apexKeyEntry {
switch m := module.(type) {
case *apexBundle:
pem, key := m.getCertificateAndPrivateKey(ctx)
return apexKeyEntry{
name: m.Name() + ".apex",
presigned: false,
publicKey: m.publicKeyFile.String(),
privateKey: m.privateKeyFile.String(),
containerCertificate: pem.String(),
containerPrivateKey: key.String(),
partition: m.PartitionTag(ctx.DeviceConfig()),
signTool: proptools.String(m.properties.Custom_sign_tool),
}
case *Prebuilt:
return apexKeyEntry{
name: m.InstallFilename(),
presigned: true,
partition: m.PartitionTag(ctx.DeviceConfig()),
}
case *ApexSet:
return apexKeyEntry{
name: m.InstallFilename(),
presigned: true,
partition: m.PartitionTag(ctx.DeviceConfig()),
}
}
panic(fmt.Errorf("unknown type(%t) for apexKeyEntry", module))
}
func writeApexKeys(ctx android.ModuleContext, module android.Module) android.WritablePath {
path := android.PathForModuleOut(ctx, "apexkeys.txt")
entry := apexKeyEntryFor(ctx, module)
android.WriteFileRuleVerbatim(ctx, path, entry.String())
return path
}
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