cld_component_installer.cc revision 010d83a9304c5a91596085d917d248abff47903a 
1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "chrome/browser/component_updater/cld_component_installer.h"
6
7#include <string>
8#include <vector>
9
10#include "base/bind.h"
11#include "base/file_util.h"
12#include "base/files/file_path.h"
13#include "base/lazy_instance.h"
14#include "base/logging.h"
15#include "base/path_service.h"
16#include "base/platform_file.h"
17#include "chrome/browser/component_updater/default_component_installer.h"
18#include "chrome/browser/profiles/profile.h"
19#include "chrome/common/chrome_constants.h"
20#include "chrome/common/chrome_paths.h"
21#include "content/public/browser/browser_thread.h"
22#include "net/ssl/ssl_config_service.h"
23
24using component_updater::ComponentUpdateService;
25using content::BrowserThread;
26
27namespace {
28
29// Once we have acquired a valid file from the component installer, we need to
30// make the path available to other parts of the system such as the
31// translation libraries. We create a global to hold onto the path, and a
32// lock to guard it. See GetLatestCldDataFile(...) for more info.
33base::LazyInstance<base::Lock> cld_file_lock = LAZY_INSTANCE_INITIALIZER;
34base::LazyInstance<base::FilePath> cld_file = LAZY_INSTANCE_INITIALIZER;
35
36}
37
38namespace component_updater {
39
40// The SHA256 of the SubjectPublicKeyInfo used to sign the extension.
41// The extension id is: dpedmmgabcgnikllifiidmijgoiihfgf
42const uint8 kPublicKeySHA256[32] = {
43    0x3f, 0x43, 0xcc, 0x60, 0x12, 0x6d, 0x8a, 0xbb,
44    0x85, 0x88, 0x3c, 0x89, 0x6e, 0x88, 0x75, 0x65,
45    0xb9, 0x46, 0x09, 0xe8, 0xca, 0x92, 0xdd, 0x82,
46    0x4e, 0x6d, 0x0e, 0xe6, 0x79, 0x8a, 0x87, 0xf5
47};
48
49const char kCldManifestName[] = "CLD2 Data";
50
51class CldComponentInstallerTraits : public ComponentInstallerTraits {
52 public:
53  CldComponentInstallerTraits();
54  virtual ~CldComponentInstallerTraits() {}
55
56 private:
57  // The following methods override ComponentInstallerTraits.
58  virtual bool CanAutoUpdate() const OVERRIDE;
59  virtual bool OnCustomInstall(const base::DictionaryValue& manifest,
60                               const base::FilePath& install_dir) OVERRIDE;
61  virtual bool VerifyInstallation(
62      const base::FilePath& install_dir) const OVERRIDE;
63  virtual void ComponentReady(
64      const base::Version& version,
65      const base::FilePath& path,
66      scoped_ptr<base::DictionaryValue> manifest) OVERRIDE;
67  virtual base::FilePath GetBaseDirectory() const OVERRIDE;
68  virtual void GetHash(std::vector<uint8>* hash) const OVERRIDE;
69  virtual std::string GetName() const OVERRIDE;
70
71  base::FilePath GetInstalledPath(const base::FilePath& base) const;
72  void SetLatestCldDataFile(const base::FilePath& path);
73  DISALLOW_COPY_AND_ASSIGN(CldComponentInstallerTraits);
74};
75
76CldComponentInstallerTraits::CldComponentInstallerTraits() {
77}
78
79bool CldComponentInstallerTraits::CanAutoUpdate() const {
80  return true;
81}
82
83bool CldComponentInstallerTraits::OnCustomInstall(
84    const base::DictionaryValue& manifest,
85    const base::FilePath& install_dir) {
86  return true;  // Nothing custom here.
87}
88
89base::FilePath CldComponentInstallerTraits::GetInstalledPath(
90    const base::FilePath& base) const {
91  // Currently, all platforms have the file at the same location because there
92  // is no binary difference in the generated file on any supported platform.
93  // NB: This may change when 64-bit is officially supported.
94  return base.Append(FILE_PATH_LITERAL("_platform_specific"))
95      .Append(FILE_PATH_LITERAL("all"))
96      .Append(chrome::kCLDDataFilename);
97}
98
99void CldComponentInstallerTraits::ComponentReady(
100    const base::Version& version,
101    const base::FilePath& path,
102    scoped_ptr<base::DictionaryValue> manifest) {
103  VLOG(1) << "Component ready, version " << version.GetString() << " in "
104          << path.value();
105  SetLatestCldDataFile(GetInstalledPath(path));
106}
107
108bool CldComponentInstallerTraits::VerifyInstallation(
109    const base::FilePath& install_dir) const {
110  // We can't really do much to verify the CLD2 data file. In theory we could
111  // read the headers, but that won't do much other than tell us whether or
112  // not the headers are valid. So just check if the file exists.
113  const base::FilePath expected_file = GetInstalledPath(install_dir);
114  VLOG(1) << "Verifying install: " << expected_file.value();
115  const bool result = base::PathExists(expected_file);
116  VLOG(1) << "Verification result: " << (result ? "valid" : "invalid");
117  return result;
118}
119
120base::FilePath CldComponentInstallerTraits::GetBaseDirectory() const {
121  base::FilePath result;
122  PathService::Get(chrome::DIR_COMPONENT_CLD2, &result);
123  return result;
124}
125
126void CldComponentInstallerTraits::GetHash(std::vector<uint8>* hash) const {
127  hash->assign(kPublicKeySHA256,
128               kPublicKeySHA256 + arraysize(kPublicKeySHA256));
129}
130
131std::string CldComponentInstallerTraits::GetName() const {
132  return kCldManifestName;
133}
134
135void RegisterCldComponent(ComponentUpdateService* cus) {
136  scoped_ptr<ComponentInstallerTraits> traits(
137      new CldComponentInstallerTraits());
138  // |cus| will take ownership of |installer| during installer->Register(cus).
139  DefaultComponentInstaller* installer =
140      new DefaultComponentInstaller(traits.Pass());
141  installer->Register(cus);
142}
143
144// This method is completely threadsafe.
145void CldComponentInstallerTraits::SetLatestCldDataFile(
146    const base::FilePath& path) {
147  VLOG(1) << "Setting CLD data file location: " << path.value();
148  base::AutoLock lock(cld_file_lock.Get());
149  cld_file.Get() = path;
150}
151
152bool GetLatestCldDataFile(base::FilePath* path) {
153  base::AutoLock lock(cld_file_lock.Get());
154  const base::FilePath cached = cld_file.Get();
155  if (cached.empty())
156    return false;
157  *path = cached;
158  return true;
159}
160
161}  // namespace component_updater
162