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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.
#include "chrome/browser/ui/webui/ntp/new_tab_ui.h"
#include <memory>
#include <string>
#include <utility>
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "base/i18n/rtl.h"
#include "base/memory/ref_counted_memory.h"
#include "base/strings/utf_string_conversions.h"
#include "base/values.h"
#include "build/build_config.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/webui/ntp/cookie_controls_handler.h"
#include "chrome/browser/ui/webui/ntp/core_app_launcher_handler.h"
#include "chrome/browser/ui/webui/ntp/ntp_resource_cache.h"
#include "chrome/browser/ui/webui/ntp/ntp_resource_cache_factory.h"
#include "chrome/browser/ui/webui/theme_handler.h"
#include "chrome/browser/ui/webui/theme_source.h"
#include "chrome/common/chrome_features.h"
#include "chrome/common/url_constants.h"
#include "components/prefs/pref_service.h"
#include "components/strings/grit/components_strings.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_ui.h"
#include "services/network/public/mojom/content_security_policy.mojom.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/native_theme/native_theme.h"
#include "url/gurl.h"
bool NewTabUIConfig::IsWebUIEnabled(content::BrowserContext* browser_context) {
Profile* profile = Profile::FromBrowserContext(browser_context);
// The URL chrome://newtab/ can be either a virtual or a real URL,
// depending on the context. In this case, it is always a real URL that
// points to the New Tab page for the incognito profile only. For other
// profile types, this URL must already be redirected to a different URL
// that matches the profile type.
//
// Returning NewWebUI<NewTabUI> for the wrong profile type will lead to
// crash in NTPResourceCache::GetNewTabHTML (Check: false), so here we add
// a sanity check to prevent further crashes.
//
// The switch statement below must be consistent with the code in
// NTPResourceCache::GetNewTabHTML!
switch (NTPResourceCache::GetWindowType(profile)) {
case NTPResourceCache::NORMAL:
LOG(ERROR) << "Requested load of chrome://newtab/ for incorrect "
"profile type.";
// TODO(crbug.com/40244589): Add DumpWithoutCrashing() here.
return false;
case NTPResourceCache::INCOGNITO:
[[fallthrough]];
case NTPResourceCache::GUEST:
[[fallthrough]];
case NTPResourceCache::NON_PRIMARY_OTR:
return true;
}
}
namespace {
// Strings sent to the page via jstemplates used to set the direction of the
// HTML document based on locale.
const char kRTLHtmlTextDirection[] = "rtl";
const char kLTRHtmlTextDirection[] = "ltr";
const char* GetHtmlTextDirection(const std::u16string& text) {
if (base::i18n::IsRTL() && base::i18n::StringContainsStrongRTLChars(text)) {
return kRTLHtmlTextDirection;
}
return kLTRHtmlTextDirection;
}
} // namespace
///////////////////////////////////////////////////////////////////////////////
// NewTabUI
NewTabUI::NewTabUI(content::WebUI* web_ui) : content::WebUIController(web_ui) {
Profile* profile = GetProfile();
// The title should be "New Tab" for regular mode and guest mode, while it
// should be "New Incognito Tab" for incognito mode.
const int title_resource_id =
profile->IsOffTheRecord() && !profile->IsGuestSession()
? IDS_NEW_INCOGNITO_TAB_TITLE
: IDS_NEW_TAB_TITLE;
web_ui->OverrideTitle(l10n_util::GetStringUTF16(title_resource_id));
if (!profile->IsGuestSession()) {
web_ui->AddMessageHandler(std::make_unique<ThemeHandler>());
if (profile->IsOffTheRecord()) {
web_ui->AddMessageHandler(
std::make_unique<CookieControlsHandler>(profile));
}
}
// content::URLDataSource assumes the ownership of the html source.
content::URLDataSource::Add(profile, std::make_unique<NewTabHTMLSource>(
profile->GetOriginalProfile()));
content::URLDataSource::Add(profile, std::make_unique<ThemeSource>(profile));
}
NewTabUI::~NewTabUI() = default;
// static
bool NewTabUI::IsNewTab(const GURL& url) {
return url.DeprecatedGetOriginAsURL() ==
GURL(chrome::kChromeUINewTabURL).DeprecatedGetOriginAsURL();
}
// static
void NewTabUI::SetUrlTitleAndDirection(base::Value::Dict* dictionary,
const std::u16string& title,
const GURL& gurl) {
dictionary->Set("url", gurl.spec());
bool using_url_as_the_title = false;
std::u16string title_to_set(title);
if (title_to_set.empty()) {
using_url_as_the_title = true;
title_to_set = base::UTF8ToUTF16(gurl.spec());
}
// We set the "dir" attribute of the title, so that in RTL locales, a LTR
// title is rendered left-to-right and truncated from the right. For example,
// the title of http://msdn.microsoft.com/en-us/default.aspx is "MSDN:
// Microsoft developer network". In RTL locales, in the [New Tab] page, if
// the "dir" of this title is not specified, it takes Chrome UI's
// directionality. So the title will be truncated as "soft developer
// network". Setting the "dir" attribute as "ltr" renders the truncated title
// as "MSDN: Microsoft D...". As another example, the title of
// http://yahoo.com is "Yahoo!". In RTL locales, in the [New Tab] page, the
// title will be rendered as "!Yahoo" if its "dir" attribute is not set to
// "ltr".
std::string direction;
if (using_url_as_the_title) {
direction = kLTRHtmlTextDirection;
} else {
direction = GetHtmlTextDirection(title);
}
dictionary->Set("title", title_to_set);
dictionary->Set("direction", direction);
}
// static
void NewTabUI::SetFullNameAndDirection(const std::u16string& full_name,
base::Value::Dict* dictionary) {
dictionary->Set("full_name", full_name);
dictionary->Set("full_name_direction", GetHtmlTextDirection(full_name));
}
Profile* NewTabUI::GetProfile() const {
return Profile::FromWebUI(web_ui());
}
///////////////////////////////////////////////////////////////////////////////
// NewTabHTMLSource
NewTabUI::NewTabHTMLSource::NewTabHTMLSource(Profile* profile)
: profile_(profile) {}
std::string NewTabUI::NewTabHTMLSource::GetSource() {
return chrome::kChromeUINewTabHost;
}
void NewTabUI::NewTabHTMLSource::StartDataRequest(
const GURL& url,
const content::WebContents::Getter& wc_getter,
content::URLDataSource::GotDataCallback callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
// Sometimes the |profile_| is the parent (non-incognito) version of the user
// so we check the |web_contents| if it is provided.
content::WebContents* web_contents = wc_getter.Run();
Profile* profile_for_window_type =
web_contents
? Profile::FromBrowserContext(web_contents->GetBrowserContext())
: profile_.get();
NTPResourceCache::WindowType win_type =
NTPResourceCache::GetWindowType(profile_for_window_type);
scoped_refptr<base::RefCountedMemory> html_bytes(
NTPResourceCacheFactory::GetForProfile(profile_)->GetNewTabHTML(
win_type, wc_getter));
std::move(callback).Run(html_bytes.get());
}
std::string NewTabUI::NewTabHTMLSource::GetMimeType(const GURL&) {
return "text/html";
}
bool NewTabUI::NewTabHTMLSource::ShouldReplaceExistingSource() {
return false;
}
std::string NewTabUI::NewTabHTMLSource::GetContentSecurityPolicy(
network::mojom::CSPDirectiveName directive) {
if (directive == network::mojom::CSPDirectiveName::ScriptSrc) {
// 'unsafe-inline' and google resources are added to script-src.
return "script-src chrome://resources 'self' 'unsafe-eval' 'unsafe-inline' "
"*.google.com *.gstatic.com;";
} else if (directive == network::mojom::CSPDirectiveName::StyleSrc) {
return "style-src 'self' chrome://resources 'unsafe-inline' "
"chrome://theme;";
} else if (directive == network::mojom::CSPDirectiveName::ImgSrc) {
return "img-src chrome-search://thumb chrome-search://thumb2 "
"chrome-search://theme chrome://theme data:;";
} else if (directive == network::mojom::CSPDirectiveName::ChildSrc) {
return "child-src chrome-search://most-visited;";
} else if (directive ==
network::mojom::CSPDirectiveName::RequireTrustedTypesFor ||
directive == network::mojom::CSPDirectiveName::TrustedTypes) {
// TODO(crbug.com/40137143): Trusted Type New Tab Page
// This removes require-trusted-types-for and trusted-types directives
// from the CSP header.
return std::string();
}
return content::URLDataSource::GetContentSecurityPolicy(directive);
}
NewTabUI::NewTabHTMLSource::~NewTabHTMLSource() = default;
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