// 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.
#include "chrome/browser/ui/webui/nacl_ui.h"
#include <stddef.h>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "base/command_line.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/json/json_file_value_serializer.h"
#include "base/memory/weak_ptr.h"
#include "base/metrics/user_metrics.h"
#include "base/path_service.h"
#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/task/thread_pool.h"
#include "base/values.h"
#include "build/build_config.h"
#include "chrome/browser/plugins/plugin_prefs.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/channel_info.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/url_constants.h"
#include "chrome/grit/branded_strings.h"
#include "chrome/grit/browser_resources.h"
#include "components/strings/grit/components_strings.h"
#include "components/version_info/version_info.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/plugin_service.h"
#include "content/public/browser/web_ui.h"
#include "content/public/browser/web_ui_data_source.h"
#include "content/public/browser/web_ui_message_handler.h"
#include "content/public/common/webplugininfo.h"
#include "services/network/public/mojom/content_security_policy.mojom.h"
#include "ui/base/l10n/l10n_util.h"
using base::ASCIIToUTF16;
using base::UserMetricsAction;
using content::BrowserThread;
using content::PluginService;
using content::WebUIMessageHandler;
namespace {
void CreateAndAddNaClUIHTMLSource(Profile* profile) {
content::WebUIDataSource* source = content::WebUIDataSource::CreateAndAdd(
profile, chrome::kChromeUINaClHost);
source->OverrideContentSecurityPolicy(
network::mojom::CSPDirectiveName::ScriptSrc,
"script-src chrome://resources 'self';");
source->OverrideContentSecurityPolicy(
network::mojom::CSPDirectiveName::TrustedTypes,
"trusted-types polymer-html-literal "
"polymer-template-event-attribute-policy;");
source->UseStringsJs();
source->AddResourcePath("about_nacl.css", IDR_ABOUT_NACL_CSS);
source->AddResourcePath("about_nacl.js", IDR_ABOUT_NACL_JS);
source->SetDefaultResource(IDR_ABOUT_NACL_HTML);
}
////////////////////////////////////////////////////////////////////////////////
//
// NaClDomHandler
//
////////////////////////////////////////////////////////////////////////////////
// The handler for JavaScript messages for the about:flags page.
class NaClDomHandler : public WebUIMessageHandler {
public:
NaClDomHandler();
NaClDomHandler(const NaClDomHandler&) = delete;
NaClDomHandler& operator=(const NaClDomHandler&) = delete;
~NaClDomHandler() override;
// WebUIMessageHandler implementation.
void RegisterMessages() override;
void OnJavascriptDisallowed() override;
private:
// Callback for the "requestNaClInfo" message.
void HandleRequestNaClInfo(const base::Value::List& args);
// Callback for the NaCl plugin information.
void OnGotPlugins(const std::vector<content::WebPluginInfo>& plugins);
// A helper callback that receives the result of checking if PNaCl path
// exists and checking the PNaCl |version|. |is_valid| is true if the PNaCl
// path that was returned by PathService is valid, and false otherwise.
void DidCheckPathAndVersion(const std::string* version, bool is_valid);
// Called when enough information is gathered to return data back to the page.
void MaybeRespondToPage();
// Helper for MaybeRespondToPage -- called after enough information
// is gathered.
base::Value::Dict GetPageInformation();
// Returns whether the specified plugin is enabled.
bool isPluginEnabled(size_t plugin_index);
// Adds information regarding the operating system and chrome version to list.
void AddOperatingSystemInfo(base::Value::List* list);
// Adds the list of plugins for NaCl to list.
void AddPluginList(base::Value::List* list);
// Adds the information relevant to PNaCl (e.g., enablement, paths, version)
// to the list.
void AddPnaclInfo(base::Value::List* list);
// Adds the information relevant to NaCl to list.
void AddNaClInfo(base::Value::List* list);
// The callback ID for requested data.
std::string callback_id_;
// Whether the plugin information is ready.
bool has_plugin_info_;
// Whether PNaCl path was validated. PathService can return a path
// that does not exists, so it needs to be validated.
bool pnacl_path_validated_;
bool pnacl_path_exists_;
std::string pnacl_version_string_;
base::WeakPtrFactory<NaClDomHandler> weak_ptr_factory_{this};
};
NaClDomHandler::NaClDomHandler()
: has_plugin_info_(false),
pnacl_path_validated_(false),
pnacl_path_exists_(false) {
}
NaClDomHandler::~NaClDomHandler() = default;
void NaClDomHandler::RegisterMessages() {
web_ui()->RegisterMessageCallback(
"requestNaClInfo",
base::BindRepeating(&NaClDomHandler::HandleRequestNaClInfo,
base::Unretained(this)));
}
void NaClDomHandler::OnJavascriptDisallowed() {
weak_ptr_factory_.InvalidateWeakPtrs();
}
void AddPair(base::Value::List* list,
const std::u16string& key,
const std::u16string& value) {
// clang-format off
list->Append(
base::Value::Dict()
.Set("key", key)
.Set("value", value));
// clang-format on
}
// Generate an empty data-pair which acts as a line break.
void AddLineBreak(base::Value::List* list) {
AddPair(list, u"", u"");
}
bool NaClDomHandler::isPluginEnabled(size_t plugin_index) {
std::vector<content::WebPluginInfo> info_array;
PluginService::GetInstance()->GetPluginInfoArray(
GURL(), "application/x-nacl", false, &info_array, NULL);
PluginPrefs* plugin_prefs =
PluginPrefs::GetForProfile(Profile::FromWebUI(web_ui())).get();
return (!info_array.empty() &&
plugin_prefs->IsPluginEnabled(info_array[plugin_index]));
}
void NaClDomHandler::AddOperatingSystemInfo(base::Value::List* list) {
// Obtain the Chrome version info.
AddPair(
list, l10n_util::GetStringUTF16(IDS_PRODUCT_NAME),
ASCIIToUTF16(base::StrCat(
{version_info::GetVersionNumber(), " (",
chrome::GetChannelName(chrome::WithExtendedStable(true)), ")"})));
// OS version information.
std::string os_label(version_info::GetOSType());
AddPair(list, l10n_util::GetStringUTF16(IDS_VERSION_UI_OS),
ASCIIToUTF16(os_label));
AddLineBreak(list);
}
void NaClDomHandler::AddPluginList(base::Value::List* list) {
// Obtain the version of the NaCl plugin.
std::vector<content::WebPluginInfo> info_array;
PluginService::GetInstance()->GetPluginInfoArray(
GURL(), "application/x-nacl", false, &info_array, NULL);
std::u16string nacl_version;
std::u16string nacl_key = u"NaCl plugin";
if (info_array.empty()) {
AddPair(list, nacl_key, u"Disabled");
} else {
// Only the 0th plugin is used.
nacl_version =
info_array[0].version + u" " + info_array[0].path.LossyDisplayName();
if (!isPluginEnabled(0)) {
nacl_version += u" (Disabled in profile prefs)";
}
AddPair(list, nacl_key, nacl_version);
// Mark the rest as not used.
for (size_t i = 1; i < info_array.size(); ++i) {
nacl_version =
info_array[i].version + u" " + info_array[i].path.LossyDisplayName();
nacl_version += u" (not used)";
if (!isPluginEnabled(i)) {
nacl_version += u" (Disabled in profile prefs)";
}
AddPair(list, nacl_key, nacl_version);
}
}
AddLineBreak(list);
}
void NaClDomHandler::AddPnaclInfo(base::Value::List* list) {
// Display whether PNaCl is enabled.
std::u16string pnacl_enabled_string = u"Enabled";
if (!isPluginEnabled(0)) {
pnacl_enabled_string = u"Disabled in profile prefs";
}
AddPair(list, u"Portable Native Client (PNaCl)", pnacl_enabled_string);
// Obtain the version of the PNaCl translator.
base::FilePath pnacl_path;
bool got_path =
base::PathService::Get(chrome::DIR_PNACL_COMPONENT, &pnacl_path);
if (!got_path || pnacl_path.empty() || !pnacl_path_exists_) {
AddPair(list, u"PNaCl translator", u"Not installed");
} else {
AddPair(list, u"PNaCl translator path", pnacl_path.LossyDisplayName());
AddPair(list, u"PNaCl translator version",
ASCIIToUTF16(pnacl_version_string_));
}
AddLineBreak(list);
}
void NaClDomHandler::AddNaClInfo(base::Value::List* list) {
std::u16string nacl_enabled_string = u"Disabled";
if (isPluginEnabled(0) &&
base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableNaCl)) {
nacl_enabled_string = u"Enabled by flag '--enable-nacl'";
}
AddPair(list, u"Native Client (non-portable, outside web store)",
nacl_enabled_string);
AddLineBreak(list);
}
void NaClDomHandler::HandleRequestNaClInfo(const base::Value::List& args) {
CHECK(callback_id_.empty());
CHECK_EQ(1U, args.size());
callback_id_ = args[0].GetString();
if (!has_plugin_info_) {
PluginService::GetInstance()->GetPlugins(base::BindOnce(
&NaClDomHandler::OnGotPlugins, weak_ptr_factory_.GetWeakPtr()));
}
// Force re-validation of PNaCl's path in the next call to
// MaybeRespondToPage(), in case PNaCl went from not-installed
// to installed since the request.
pnacl_path_validated_ = false;
AllowJavascript();
MaybeRespondToPage();
}
void NaClDomHandler::OnGotPlugins(
const std::vector<content::WebPluginInfo>& plugins) {
has_plugin_info_ = true;
MaybeRespondToPage();
}
base::Value::Dict NaClDomHandler::GetPageInformation() {
// Store Key-Value pairs of about-information.
base::Value::List list;
// Display the operating system and chrome version information.
AddOperatingSystemInfo(&list);
// Display the list of plugins serving NaCl.
AddPluginList(&list);
// Display information relevant to PNaCl.
AddPnaclInfo(&list);
// Display information relevant to NaCl (non-portable.
AddNaClInfo(&list);
// naclInfo will take ownership of list, and clean it up on destruction.
return base::Value::Dict().Set("naclInfo", std::move(list));
}
void NaClDomHandler::DidCheckPathAndVersion(const std::string* version,
bool is_valid) {
pnacl_path_validated_ = true;
pnacl_path_exists_ = is_valid;
pnacl_version_string_ = *version;
MaybeRespondToPage();
}
void CheckVersion(const base::FilePath& pnacl_path, std::string* version) {
base::FilePath pnacl_json_path =
pnacl_path.AppendASCII("pnacl_public_pnacl_json");
JSONFileValueDeserializer deserializer(pnacl_json_path);
std::string error;
std::unique_ptr<base::Value> root = deserializer.Deserialize(nullptr, &error);
if (!root || !root->is_dict())
return;
// Now try to get the field. This may leave version empty if the
// the "get" fails (no key, or wrong type).
if (const std::string* ptr = root->GetDict().FindString("pnacl-version")) {
if (base::IsStringASCII(*ptr))
*version = *ptr;
}
}
bool CheckPathAndVersion(std::string* version) {
base::FilePath pnacl_path;
bool got_path =
base::PathService::Get(chrome::DIR_PNACL_COMPONENT, &pnacl_path);
if (got_path && !pnacl_path.empty() && base::PathExists(pnacl_path)) {
CheckVersion(pnacl_path, version);
return true;
}
return false;
}
void NaClDomHandler::MaybeRespondToPage() {
// Don't reply until everything is ready. The page will show a 'loading'
// message until then.
if (callback_id_.empty() || !has_plugin_info_)
return;
if (!pnacl_path_validated_) {
std::string* version_string = new std::string;
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, {base::MayBlock(), base::TaskPriority::BEST_EFFORT},
base::BindOnce(&CheckPathAndVersion, version_string),
base::BindOnce(&NaClDomHandler::DidCheckPathAndVersion,
weak_ptr_factory_.GetWeakPtr(),
base::Owned(version_string)));
return;
}
ResolveJavascriptCallback(base::Value(callback_id_), GetPageInformation());
callback_id_.clear();
}
} // namespace
///////////////////////////////////////////////////////////////////////////////
//
// NaClUI
//
///////////////////////////////////////////////////////////////////////////////
NaClUI::NaClUI(content::WebUI* web_ui) : WebUIController(web_ui) {
base::RecordAction(UserMetricsAction("ViewAboutNaCl"));
web_ui->AddMessageHandler(std::make_unique<NaClDomHandler>());
// Set up the about:nacl source.
CreateAndAddNaClUIHTMLSource(Profile::FromWebUI(web_ui));
}
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