cld_component_installer.cc revision 5c02ac1a9c1b504631c0a3d2b6e737b5d738bae1 
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 "base/bind.h"
8#include "base/file_util.h"
9#include "base/files/file_path.h"
10#include "base/lazy_instance.h"
11#include "base/logging.h"
12#include "base/path_service.h"
13#include "base/platform_file.h"
14#include "chrome/browser/component_updater/default_component_installer.h"
15#include "chrome/browser/profiles/profile.h"
16#include "chrome/common/chrome_constants.h"
17#include "chrome/common/chrome_paths.h"
18#include "content/public/browser/browser_thread.h"
19#include "net/ssl/ssl_config_service.h"
20
21using component_updater::ComponentUpdateService;
22using content::BrowserThread;
23
24namespace {
25
26// Once we have acquired a valid file from the component installer, we need to
27// make the path available to other parts of the system such as the
28// translation libraries. We create a global to hold onto the path, and a
29// lock to guard it. See GetLatestCldDataFile(...) for more info.
30base::LazyInstance<base::Lock> cld_file_lock = LAZY_INSTANCE_INITIALIZER;
31base::LazyInstance<base::FilePath> cld_file = LAZY_INSTANCE_INITIALIZER;
32
33}
34
35namespace component_updater {
36
37// The SHA256 of the SubjectPublicKeyInfo used to sign the extension.
38// The extension id is: dpedmmgabcgnikllifiidmijgoiihfgf
39const uint8 kPublicKeySHA256[32] = {
40  0x3f, 0x43, 0xcc, 0x60, 0x12, 0x6d, 0x8a, 0xbb,
41  0x85, 0x88, 0x3c, 0x89, 0x6e, 0x88, 0x75, 0x65,
42  0xb9, 0x46, 0x09, 0xe8, 0xca, 0x92, 0xdd, 0x82,
43  0x4e, 0x6d, 0x0e, 0xe6, 0x79, 0x8a, 0x87, 0xf5
44};
45
46const char kCldManifestName[] = "CLD2 Data";
47
48class CldComponentInstallerTraits : public ComponentInstallerTraits {
49 public:
50  CldComponentInstallerTraits();
51  virtual ~CldComponentInstallerTraits() {}
52
53 private:
54  // The following methods override ComponentInstallerTraits.
55  virtual bool CanAutoUpdate() const OVERRIDE;
56  virtual bool OnCustomInstall(const base::DictionaryValue& manifest,
57                               const base::FilePath& install_dir) OVERRIDE;
58  virtual bool VerifyInstallation(
59      const base::FilePath& install_dir) const OVERRIDE;
60  virtual void ComponentReady(
61      const base::Version& version,
62      const base::FilePath& path,
63      scoped_ptr<base::DictionaryValue> manifest) OVERRIDE;
64  virtual base::FilePath GetBaseDirectory() const OVERRIDE;
65  virtual void GetHash(std::vector<uint8>* hash) const OVERRIDE;
66  virtual std::string GetName() const OVERRIDE;
67
68  base::FilePath GetInstalledPath(const base::FilePath& base) const;
69  void SetLatestCldDataFile(const base::FilePath& path);
70  DISALLOW_COPY_AND_ASSIGN(CldComponentInstallerTraits);
71};
72
73CldComponentInstallerTraits::CldComponentInstallerTraits() {
74}
75
76bool CldComponentInstallerTraits::CanAutoUpdate() const {
77  return true;
78}
79
80bool CldComponentInstallerTraits::OnCustomInstall(
81    const base::DictionaryValue& manifest,
82    const base::FilePath& install_dir) {
83  return true; // Nothing custom here.
84}
85
86base::FilePath CldComponentInstallerTraits::GetInstalledPath(
87    const base::FilePath& base) const {
88  // Currently, all platforms have the file at the same location because there
89  // is no binary difference in the generated file on any supported platform.
90  // NB: This may change when 64-bit is officially supported.
91  return base.Append(FILE_PATH_LITERAL("_platform_specific"))
92      .Append(FILE_PATH_LITERAL("all"))
93      .Append(chrome::kCLDDataFilename);
94}
95
96void CldComponentInstallerTraits::ComponentReady(
97    const base::Version& version,
98    const base::FilePath& path,
99    scoped_ptr<base::DictionaryValue> manifest) {
100  VLOG(1) << "Component ready, version " << version.GetString()
101          << " in " << path.value();
102  SetLatestCldDataFile(GetInstalledPath(path));
103}
104
105bool CldComponentInstallerTraits::VerifyInstallation(
106    const base::FilePath& install_dir) const {
107  // We can't really do much to verify the CLD2 data file. In theory we could
108  // read the headers, but that won't do much other than tell us whether or
109  // not the headers are valid. So just check if the file exists.
110  const base::FilePath expected_file = GetInstalledPath(install_dir);
111  VLOG(1) << "Verifying install: " << expected_file.value();
112  const bool result = base::PathExists(expected_file);
113  VLOG(1) << "Verification result: " << (result ? "valid" : "invalid");
114  return result;
115}
116
117base::FilePath CldComponentInstallerTraits::GetBaseDirectory() const {
118  base::FilePath result;
119  PathService::Get(chrome::DIR_COMPONENT_CLD2, &result);
120  return result;
121}
122
123void CldComponentInstallerTraits::GetHash(std::vector<uint8>* hash) const {
124  hash->assign(kPublicKeySHA256,
125               kPublicKeySHA256 + arraysize(kPublicKeySHA256));
126}
127
128std::string CldComponentInstallerTraits::GetName() const {
129  return kCldManifestName;
130}
131
132void RegisterCldComponent(ComponentUpdateService* cus) {
133  scoped_ptr<ComponentInstallerTraits> traits(
134      new CldComponentInstallerTraits());
135  // |cus| will take ownership of |installer| during installer->Register(cus).
136  DefaultComponentInstaller* installer
137      = new DefaultComponentInstaller(traits.Pass());
138  installer->Register(cus);
139}
140
141// This method is completely threadsafe.
142void CldComponentInstallerTraits::SetLatestCldDataFile(
143    const base::FilePath& path) {
144  VLOG(1) << "Setting CLD data file location: " << path.value();
145  base::AutoLock lock(cld_file_lock.Get());
146  cld_file.Get() = path;
147}
148
149bool GetLatestCldDataFile(base::FilePath* path) {
150  base::AutoLock lock(cld_file_lock.Get());
151  const base::FilePath cached = cld_file.Get();
152  if (cached.empty()) return false;
153  *path = cached;
154  return true;
155}
156
157}  // namespace component_updater
158