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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Download code which handles CRX files (extensions, themes, apps, ...).
#include "chrome/browser/download/download_crx_util.h"
#include <memory>
#include "base/auto_reset.h"
#include "build/build_config.h"
#include "chrome/browser/extensions/crx_installer.h"
#include "chrome/browser/extensions/extension_install_prompt.h"
#include "chrome/browser/extensions/extension_management.h"
#include "chrome/browser/extensions/webstore_installer.h"
#include "chrome/browser/profiles/profile.h"
#include "components/download/public/common/download_item.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/download_item_utils.h"
#include "extensions/buildflags/buildflags.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_urls.h"
#include "extensions/common/user_script.h"
#if BUILDFLAG(ENABLE_EXTENSIONS)
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#else
#include "base/notimplemented.h"
#endif
static_assert(BUILDFLAG(ENABLE_EXTENSIONS_CORE));
using content::BrowserThread;
using download::DownloadItem;
using extensions::WebstoreInstaller;
namespace download_crx_util {
namespace {
bool g_allow_offstore_install_for_testing = false;
// Hold a mock ExtensionInstallPrompt object that will be used when the
// download system opens a CRX.
ExtensionInstallPrompt* mock_install_prompt_for_testing = nullptr;
// Called to get an extension install UI object. In tests, will return
// a mock if the test calls download_util::SetMockInstallPromptForTesting()
// to set one.
std::unique_ptr<ExtensionInstallPrompt> CreateExtensionInstallPrompt(
Profile* profile,
const DownloadItem& download_item) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
// Use a mock if one is present. Otherwise, create a real extensions
// install UI.
if (mock_install_prompt_for_testing) {
ExtensionInstallPrompt* result = mock_install_prompt_for_testing;
mock_install_prompt_for_testing = nullptr;
return std::unique_ptr<ExtensionInstallPrompt>(result);
} else {
content::WebContents* web_contents =
content::DownloadItemUtils::GetWebContents(
const_cast<DownloadItem*>(&download_item));
if (!web_contents) {
Browser* browser = chrome::FindLastActiveWithProfile(profile);
if (!browser) {
browser = Browser::Create(
Browser::CreateParams(Browser::TYPE_NORMAL, profile, true));
}
web_contents = browser->tab_strip_model()->GetActiveWebContents();
}
return std::make_unique<ExtensionInstallPrompt>(web_contents);
}
#else
// TODO(crbug.com/397754565): Show extension install UI on desktop Android.
NOTIMPLEMENTED() << "CreateExtensionInstallPrompt";
return nullptr;
#endif // BUILDFLAG(ENABLE_EXTENSIONS)
}
} // namespace
bool OffStoreInstallAllowedByPrefs(Profile* profile, const DownloadItem& item) {
return g_allow_offstore_install_for_testing ||
extensions::ExtensionManagementFactory::GetForBrowserContext(profile)
->IsOffstoreInstallAllowed(item.GetURL(), item.GetReferrerUrl());
}
// Tests can call this method to inject a mock ExtensionInstallPrompt
// to be used to confirm permissions on a downloaded CRX.
void SetMockInstallPromptForTesting(
std::unique_ptr<ExtensionInstallPrompt> mock_prompt) {
mock_install_prompt_for_testing = mock_prompt.release();
}
scoped_refptr<extensions::CrxInstaller> CreateCrxInstaller(
Profile* profile,
const download::DownloadItem& download_item) {
scoped_refptr<extensions::CrxInstaller> installer(
extensions::CrxInstaller::Create(
profile, CreateExtensionInstallPrompt(profile, download_item),
WebstoreInstaller::GetAssociatedApproval(download_item)));
installer->set_error_on_unsupported_requirements(true);
installer->set_delete_source(true);
installer->set_was_triggered_by_user_download();
installer->set_original_mime_type(download_item.GetOriginalMimeType());
installer->set_apps_require_extension_mime_type(true);
return installer;
}
bool IsExtensionDownload(const DownloadItem& download_item) {
if (download_item.GetTargetDisposition() ==
DownloadItem::TARGET_DISPOSITION_PROMPT)
return false;
if (download_item.GetMimeType() == extensions::Extension::kMimeType ||
extensions::UserScript::IsURLUserScript(download_item.GetURL(),
download_item.GetMimeType())) {
return true;
} else {
return false;
}
}
bool IsTrustedExtensionDownload(Profile* profile, const DownloadItem& item) {
return IsExtensionDownload(item) &&
(OffStoreInstallAllowedByPrefs(profile, item) ||
extension_urls::IsWebstoreUpdateUrl(item.GetOriginalUrl()) ||
extension_urls::IsWebstoreDomain(item.GetOriginalUrl()));
}
std::unique_ptr<base::AutoReset<bool>> OverrideOffstoreInstallAllowedForTesting(
bool allowed) {
return std::make_unique<base::AutoReset<bool>>(
&g_allow_offstore_install_for_testing, allowed);
}
} // namespace download_crx_util
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