Pull CrxInstaller out of ExtensionsService.

chrome/browser/extensions/crx_installer.cc

Index: chrome/browser/extensions/crx_installer.cc
diff --git a/chrome/browser/extensions/crx_installer.cc b/chrome/browser/extensions/crx_installer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..445d37cd2d16528e229024fbc034ecdf300d7357
--- /dev/null
+++ b/chrome/browser/extensions/crx_installer.cc
@@ -0,0 +1,193 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/extensions/crx_installer.h"
+
+#include "app/l10n_util.h"
+#include "base/file_util.h"
+#include "base/scoped_temp_dir.h"
+#include "base/string_util.h"
+#include "base/task.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/extensions/extension_file_util.h"
+#include "chrome/common/extensions/extension_error_reporter.h"
+#include "grit/chromium_strings.h"
+
+#if defined(OS_WIN)
+#include "app/win_util.h"
+#elif defined(OS_MACOSX)
+#include "base/scoped_cftyperef.h"
+#include "base/sys_string_conversions.h"
+#include <CoreFoundation/CFUserNotification.h>
+#endif
+
+CrxInstaller::CrxInstaller(const FilePath& crx_path,
+                           const FilePath& install_directory,
+                           Extension::Location install_source,
+                           const std::string& expected_id,
+                           bool extensions_enabled,
+                           bool is_from_gallery,
+                           bool show_prompts,
+                           bool delete_crx,
+                           MessageLoop* file_loop,
+                           ExtensionsService* frontend)
+    : crx_path_(crx_path),
+      install_directory_(install_directory),
+      install_source_(install_source),
+      expected_id_(expected_id),
+      extensions_enabled_(extensions_enabled),
+      is_from_gallery_(is_from_gallery),
+      show_prompts_(show_prompts),
+      file_loop_(file_loop),
+      ui_loop_(MessageLoop::current()) {
+
+  // Note: this is a refptr so that we keep the frontend alive long enough to
+  // get our response.
+  frontend_ = frontend;
+  unpacker_ = new SandboxedExtensionUnpacker(
+      crx_path, g_browser_process->resource_dispatcher_host(), this);
+
+  file_loop->PostTask(FROM_HERE, NewRunnableMethod(unpacker_,
+      &SandboxedExtensionUnpacker::Start));
+}
+
+void CrxInstaller::OnUnpackFailure(const std::string& error_message) {
+  ReportFailureFromFileThread(error_message);
+}
+
+void CrxInstaller::OnUnpackSuccess(const FilePath& temp_dir,
+                                   const FilePath& extension_dir,
+                                   Extension* extension) {
+  // Note: We take ownership of |extension| and |temp_dir|.
+  extension_.reset(extension);
+  temp_dir_ = temp_dir;
+
+  // temp_dir_deleter is stack allocated instead of a member of CrxInstaller, so
+  // that delete always happens on the file thread.
+  ScopedTempDir temp_dir_deleter;
+  temp_dir_deleter.Set(temp_dir);
+
+  // The unpack dir we don't have to delete explicity since it is a child of
+  // the temp dir.
+  unpacked_extension_root_ = extension_dir;
+  DCHECK(file_util::ContainsPath(temp_dir_, unpacked_extension_root_));
+
+  // If we were supposed to delete the source file, we can do that now.
+  if (delete_crx_)
+    file_util::Delete(crx_path_, false);  // non-recursive
+
+  // Determine whether to allow installation. We always allow themes and
+  // external installs.
+  if (!extensions_enabled_ && !extension->IsTheme() &&
+      !Extension::IsExternalLocation(install_source_)) {
+    ReportFailureFromFileThread("Extensions are not enabled.");
+    return;
+  }
+
+  // Make sure the expected id matches.
+  // TODO(aa): Also support expected version?
+  if (!expected_id_.empty() && expected_id_ != extension->id()) {
+    ReportFailureFromFileThread(
+        StringPrintf("ID in new extension manifest (%s) does not match "
+                     "expected id (%s)",
+                     extension->id().c_str(),
+                     expected_id_.c_str()));
+    return;
+  }
+
+  // Show the confirm UI if necessary.
+  // NOTE: We also special case themes to not have a dialog, because we show
+  // a special infobar UI for them instead.
+  if (show_prompts_ && !extension->IsTheme()) {
+    if (!ConfirmInstall())
+      return;  // error reported by ConfirmInstall()
+  }
+
+  CompleteInstall();
+}
+
+bool CrxInstaller::ConfirmInstall() {
+#if defined(OS_WIN)
+  if (win_util::MessageBox(GetForegroundWindow(),
+          L"Are you sure you want to install this extension?\n\n"
+          L"You should only install extensions from sources you trust.",
+          l10n_util::GetString(IDS_PRODUCT_NAME).c_str(),
+          MB_OKCANCEL) != IDOK) {
+    ReportFailureFromFileThread("User did not allow extension to be "
+                                "installed.");
+    return false;
+  }
+#elif defined(OS_MACOSX)
+  // Using CoreFoundation to do this dialog is unimaginably lame but will do
+  // until the UI is redone.
+  scoped_cftyperef<CFStringRef> product_name(
+      base::SysWideToCFStringRef(l10n_util::GetString(IDS_PRODUCT_NAME)));
+  CFOptionFlags response;
+  if (kCFUserNotificationAlternateResponse == CFUserNotificationDisplayAlert(
+      0, kCFUserNotificationCautionAlertLevel, NULL, NULL, NULL,
+      product_name,
+      CFSTR("Are you sure you want to install this extension?\n\n"
+           "This is a temporary message and it will be removed when "
+           "extensions UI is finalized."),
+      NULL, CFSTR("Cancel"), NULL, &response);
+    ReportFailureFromFileThread("User did not allow extension to be "
+                                "installed.");
+    return false;
+  }
+#endif  // OS_*
+
+  return true;
+}
+
+void CrxInstaller::CompleteInstall() {
+  FilePath version_dir;
+  Extension::InstallType install_type = Extension::INSTALL_ERROR;
+  std::string error_msg;
+  if (!extension_file_util::InstallExtension(unpacked_extension_root_,
+                                             install_directory_,
+                                             extension_->id(),
+                                             extension_->VersionString(),
+                                             &version_dir,
+                                             &install_type, &error_msg)) {
+    ReportFailureFromFileThread(error_msg);
+    return;
+  }
+
+  if (install_type == Extension::DOWNGRADE) {
+    ReportFailureFromFileThread("Attempted to downgrade extension.");
+    return;
+  }
+
+  extension_->set_path(version_dir);
+  extension_->set_location(install_source_);
+
+  if (install_type == Extension::REINSTALL) {
+    // We use this as a signal to switch themes.
+    ReportOverinstallFromFileThread();
+    return;
+  }
+
+  ReportSuccessFromFileThread();
+}
+
+void CrxInstaller::ReportFailureFromFileThread(const std::string& error) {
+  ui_loop_->PostTask(FROM_HERE, NewRunnableMethod(this,
+      &CrxInstaller::ReportFailureFromUIThread, error));
+}
+
+void CrxInstaller::ReportFailureFromUIThread(const std::string& error) {
+  ExtensionErrorReporter::GetInstance()->ReportError(error, show_prompts_);
+}
+
+void CrxInstaller::ReportOverinstallFromFileThread() {
+  ui_loop_->PostTask(FROM_HERE, NewRunnableMethod(frontend_.get(),
+      &ExtensionsService::OnExtensionOverinstallAttempted, extension_->id()));
+}
+
+void CrxInstaller::ReportSuccessFromFileThread() {
+  // Tell the frontend about the installation and hand off ownership of
+  // extension_ to it.
+  ui_loop_->PostTask(FROM_HERE, NewRunnableMethod(frontend_.get(),
+      &ExtensionsService::OnExtensionInstalled, extension_.release()));
+}