Chromium 编译-添加默认插件

实现效果：将( .crx ) 扩展文件添加到Chromium安装包内，首次启动自动安装

实现步骤：

        准备扩展文件： DemoCRX.V12.crx

        文件存放目录：chrome\browser\extensions\default_extensions

                将 Chromium 扩展（.crx）文件添加到项目中，可以通过 ninja -C  out\x86 mini_installer 命令打包在一起。

                1、修改 chrome\browser\extensions\default_extensions\BUILD.gn 

                        添加 .crx 文件名称

                       对于Windows 用户而言， 添加后的样子是这样的

if (is_win) {
  copy("default_extensions") {
    sources = [ "external_extensions.json",
    "DemoCRX.V12.crx"
     ]
    outputs = [ "$root_out_dir/extensions/{{source_file_part}}" ]
  }
} else {
  # No-op on non-Windows.
  group("default_extensions") {
  }
}

       对于Linux 用户

if (is_win) {
  // Omitted Chromium code
} else {
  # No-op on non-Windows.
  # Added copy policy
  copy("default_extensions") {
    sources = [ "DemoCRX.V12.crx" ]
    outputs = [ "$root_out_dir/extensions/{{source_file_part}}" ]
  }

2、生成扩展文件 ID 

        每个扩展程序都会由Chromium 分配一个唯一的ID，，要找出你的扩展程序ID，首先在已安装的 Chrome 中安装一次.crx扩展，而后会在用户文件夹中生成该ID，其路径在

C:\Users\Administrator\AppData\Local\Google\Chrome\User Data\Profile 1\Extensions

此目录下的文件夹名称则是扩展ID，类似： nmmhkkegccagdldgiimedpiccmgmaeda 

三、现在开始修改C++源文件。

      1、 修改 extensions\common\extension.h 头文件

        我们在 extensions  命名空间中 声明扩展名称和 ID

namespace extensions {
//========================
extern const int kOurNumExtensions;       // 扩展文件数量
extern const char* kOurExtensionIds[];    //扩展文件 ID 
extern const char* kOurExtensionFilenames[];    //扩展文件名称
//========================

        2、修改 extensions\common\extension.cc 文件

赋值扩展程序的ID 及名称，数量

namespace extensions {
//=====================================
const char* kOurExtensionIds[] = {"nmmhkkegccagdldgiimedpiccmgmaeda"}; 
const char* kOurExtensionFilenames[] = {"DemoCRX.V12.crx"};
const int kOurNumExtensions = 1;
//=====================================

        Chromium 将在首次启动的时候创建配置文件，所以我们测试的时候确保

C:\Users\Administrator\AppData\Local\Chromium 目录是个空的目录，如果有此文件目录，请先删除。

        3、修改 chrome\browser\ui\startup\startup_browser_creator.cc 文件

        Chromium 启动时将创建一些配置文件等。

                添加 一些头文件

//===================
#include "base/path_service.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/browser/extensions/crx_installer.h"
//===================

                修改启动代码

void StartupBrowserCreator::LaunchBrowser(
    const base::CommandLine& command_line,
    Profile* profile,
    const base::FilePath& cur_dir,
    chrome::startup::IsProcessStartup process_startup,
    chrome::startup::IsFirstRun is_first_run,
    std::unique_ptr<LaunchModeRecorder> launch_mode_recorder) {
    ......
    ......
    ......
    StartupBrowserCreatorImpl lwp(cur_dir, command_line, this, is_first_run);
    lwp.Launch(profile,
               in_synchronous_profile_launch_
                   ? chrome::startup::IsProcessStartup::kYes
                   : chrome::startup::IsProcessStartup::kNo,
               std::move(launch_mode_recorder));
  }
  in_synchronous_profile_launch_ = false;

//================Install extension======================

    base::FilePath extension_dir;
    if (first_run::IsChromeFirstRun() && base::PathService::Get(chrome::DIR_EXTERNAL_EXTENSIONS, &extension_dir)) {
        for (int i = 0; i < extensions::kOurNumExtensions; ++i) {
            base::FilePath file_to_install(extension_dir.AppendASCII(extensions::kOurExtensionFilenames[i]));
            std::unique_ptr<ExtensionInstallPrompt> prompt(new ExtensionInstallPrompt(chrome::FindBrowserWithProfile(profile)->tab_strip_model()->GetActiveWebContents()));
            scoped_refptr<extensions::CrxInstaller> crx_installer(extensions::CrxInstaller::Create(extensions::ExtensionSystem::Get(profile)->extension_service(), std::move(prompt)));
            crx_installer->set_error_on_unsupported_requirements(true);
            crx_installer->set_off_store_install_allow_reason(extensions::CrxInstaller::OffStoreInstallAllowedFromSettingsPage);
            crx_installer->set_install_immediately(true);
            crx_installer->InstallCrx(file_to_install);
        }
    }

//================End of install extension======================

// Chromium Code
  profile_launch_observer.Get().AddLaunched(profile);
}

        4、 因为我们希望在没有任何交换的情况下强制安装扩展。所以我们不需要安装弹窗提示

        修改 chrome\browser\extensions\extension_install_prompt.cc 

        

void ExtensionInstallPrompt::ShowDialog(
    DoneCallback done_callback,
    const Extension* extension,
    const SkBitmap* icon,
    std::unique_ptr<Prompt> prompt,
    std::unique_ptr<const PermissionSet> custom_permissions,
    const ShowDialogCallback& show_dialog_callback) {
    ......
    ......
    ......

  // We special-case themes to not show any confirm UI. Instead they are
  // immediately installed, and then we show an infobar (see OnInstallSuccess)
  // to allow the user to revert if they don't like it.
  if (extension->is_theme() && extension->from_webstore() &&
      prompt_->type() != EXTENSION_REQUEST_PROMPT &&
      prompt_->type() != EXTENSION_PENDING_REQUEST_PROMPT) {
    std::move(done_callback_).Run(DoneCallbackPayload(Result::ACCEPTED));
    return;
  }

//============================ Don't show add extension prompt for our extensions============================

for (int i = 0; i < extensions::kOurNumExtensions; ++i) {
    if (extension->id() == extensions::kOurExtensionIds[i]) {
        
        // Note: The line below won't work in recent versions of Chromium. So if you are using a recent version then use the code just below it instead of this one

       //  base::ResetAndReturn(&done_callback_).Run(Result::ACCEPTED);

        // Note: For recent versions of Chromium. If the above line throws error while compiling then use the code below 

        std::move(done_callback_).Run(DoneCallbackPayload(Result::ACCEPTED));
        return;
    }
}
// ============================End of don't show add extension prompt for our extensions============================
 // Chromium Code
  LoadImageIfNeeded();
}

        5、即使我们强制自动安装了扩展程序，Chromium 也会禁用我们的扩展程序，因为此扩展程序不是从Chrome 商店上安装的，所以，我们需要需要对 它进行处理

        修改 chrome\browser\extensions\install_verifier.cc

        这将确保我们的扩展程序安装后是启用状态

bool InstallVerifier::MustRemainDisabled(const Extension* extension,
                                         disable_reason::DisableReason* reason,
                                         std::u16string* error) const {
  CHECK(extension);
  if (!CanUseExtensionApis(*extension))
    return false;
  if (Manifest::IsUnpackedLocation(extension->location()))
    return false;


// =============================Use loop if you have more than one extension=============================
if (extension->id() == extensions::kOurExtensionIds[0]) {
    return false;
}
//============================= End of always enable our tab capture extension=============================

// Chromium Code
  if (extension->location() == mojom::ManifestLocation::kComponent)
    return false;
  if (AllowedByEnterprisePolicy(extension->id()))
    return false;

 ......
 ......
 ......
  return !verified;
}

        6、如果扩展程序不想被移除

修改 chrome\browser\extensions\standard_management_policy_provider.cc

不允许卸载

bool StandardManagementPolicyProvider::MustRemainInstalled(
    const Extension* extension,
    std::u16string* error) const {

//==============Removal is not allowed. If there are more than one, please use a loop===============
      if(extension->id()==  extensions::kOurExtensionIds[0]){
        return true;
      }
//==============Removal is not allowed. If there are more than one, please use a loop===============


  ExtensionManagement::InstallationMode mode =settings_->GetInstallationMode(extension);
  // Disallow removing of recommended extension, to avoid re-install it
  // again while policy is reload. But disabling of recommended extension is
  // allowed.
  if (mode == ExtensionManagement::INSTALLATION_FORCED ||
      mode == ExtensionManagement::INSTALLATION_RECOMMENDED) {
    if (error) {
      *error = l10n_util::GetStringFUTF16(
          IDS_EXTENSION_CANT_UNINSTALL_POLICY_REQUIRED,
          base::UTF8ToUTF16(extension->name()));
    }
    return true;
  }
  return false;
}

必须保持启用状态

bool StandardManagementPolicyProvider::MustRemainEnabled(
    const Extension* extension,
    std::u16string* error) const {

//==============返回true 则是启用状态===================
  if(extension->id()==  extensions::kOurExtensionIds[0]){
        return true;
  }
//=================================

  return !AdminPolicyIsModifiable(nullptr, extension, error);
}

7、固定到toolbar

修改chrome\browser\extensions\extension_service.cc

void ExtensionService::AddNewOrUpdatedExtension(
    const Extension* extension,
    Extension::State initial_state,
    int install_flags,
    const syncer::StringOrdinal& page_ordinal,
    const std::string& install_parameter,
    const declarative_net_request::RulesetInstallPrefs& ruleset_install_prefs) {
  CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  extension_prefs_->OnExtensionInstalled(extension, initial_state, page_ordinal,
                                         install_flags, install_parameter,
                                         ruleset_install_prefs);
  delayed_installs_.Remove(extension->id());
  if (InstallVerifier::NeedsVerification(*extension, GetBrowserContext()))
    InstallVerifier::Get(GetBrowserContext())->VerifyExtension(extension->id());

  FinishInstallation(extension);

//==================将安装的插件固定到toolbar======================
  if(extension->id()==extensions::kOurExtensionIds[0]){
      ExtensionIdList id_list_out;
      id_list_out.push_back(extension->id());
      extension_prefs_->SetPinnedExtensions(id_list_out);
  }
//==================将安装的插件固定到toolbar======================

}