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// Copyright (c) 2012 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/ui/webui/theme_source.h"
#include "base/bind.h"
#include "base/memory/ref_counted_memory.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/task/post_task.h"
#include "build/branding_buildflags.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/resources_util.h"
#include "chrome/browser/search/instant_io_context.h"
#include "chrome/browser/themes/browser_theme_pack.h"
#include "chrome/browser/themes/theme_properties.h"
#include "chrome/browser/themes/theme_service.h"
#include "chrome/browser/themes/theme_service_factory.h"
#include "chrome/browser/ui/webui/ntp/ntp_resource_cache.h"
#include "chrome/browser/ui/webui/ntp/ntp_resource_cache_factory.h"
#include "chrome/common/channel_info.h"
#include "chrome/common/url_constants.h"
#include "chrome/grit/theme_resources.h"
#include "components/version_info/version_info.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/url_data_source.h"
#include "content/public/common/url_constants.h"
#include "net/url_request/url_request.h"
#include "ui/base/layout.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/base/webui/web_ui_util.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_rep.h"
#include "url/gurl.h"
namespace {
GURL GetThemeUrl(const std::string& path) {
return GURL(std::string(content::kChromeUIScheme) + "://" +
std::string(chrome::kChromeUIThemeHost) + "/" + path);
}
bool IsNewTabCssPath(const std::string& path) {
static const char kNewTabCSSPath[] = "css/new_tab_theme.css";
static const char kIncognitoNewTabCSSPath[] =
"css/incognito_new_tab_theme.css";
return (path == kNewTabCSSPath) || (path == kIncognitoNewTabCSSPath);
}
void ProcessImageOnUiThread(const gfx::ImageSkia& image,
float scale,
scoped_refptr<base::RefCountedBytes> data) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
const gfx::ImageSkiaRep& rep = image.GetRepresentation(scale);
gfx::PNGCodec::EncodeBGRASkBitmap(
rep.GetBitmap(), false /* discard transparency */, &data->data());
}
void ProcessResourceOnUiThread(int resource_id,
float scale,
scoped_refptr<base::RefCountedBytes> data) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
ProcessImageOnUiThread(
*ui::ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id),
scale, data);
}
} // namespace
////////////////////////////////////////////////////////////////////////////////
// ThemeSource, public:
ThemeSource::ThemeSource(Profile* profile) : profile_(profile) {}
ThemeSource::~ThemeSource() = default;
std::string ThemeSource::GetSource() {
return chrome::kChromeUIThemeHost;
}
void ThemeSource::StartDataRequest(
const std::string& path,
const content::WebContents::Getter& wc_getter,
const content::URLDataSource::GotDataCallback& callback) {
// Default scale factor if not specified.
float scale = 1.0f;
// All frames by default if not specified.
int frame = -1;
std::string parsed_path;
webui::ParsePathAndImageSpec(GetThemeUrl(path), &parsed_path, &scale, &frame);
if (IsNewTabCssPath(parsed_path)) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
NTPResourceCache::WindowType type =
NTPResourceCache::GetWindowType(profile_, /*render_host=*/nullptr);
NTPResourceCache* cache = NTPResourceCacheFactory::GetForProfile(profile_);
callback.Run(cache->GetNewTabCSS(type));
return;
}
int resource_id = -1;
if (parsed_path == "current-channel-logo") {
switch (chrome::GetChannel()) {
#if BUILDFLAG(GOOGLE_CHROME_BRANDING)
case version_info::Channel::CANARY:
resource_id = IDR_PRODUCT_LOGO_32_CANARY;
break;
case version_info::Channel::DEV:
resource_id = IDR_PRODUCT_LOGO_32_DEV;
break;
case version_info::Channel::BETA:
resource_id = IDR_PRODUCT_LOGO_32_BETA;
break;
case version_info::Channel::STABLE:
resource_id = IDR_PRODUCT_LOGO_32;
break;
#else
case version_info::Channel::CANARY:
case version_info::Channel::DEV:
case version_info::Channel::BETA:
case version_info::Channel::STABLE:
NOTREACHED();
FALLTHROUGH;
#endif
case version_info::Channel::UNKNOWN:
resource_id = IDR_PRODUCT_LOGO_32;
break;
}
} else {
resource_id = ResourcesUtil::GetThemeResourceId(parsed_path);
}
// Limit the maximum scale we'll respond to. Very large scale factors can
// take significant time to serve or, at worst, crash the browser due to OOM.
// We don't want to clamp to the max scale factor, though, for devices that
// use 2x scale without 2x data packs, as well as omnibox requests for larger
// (but still reasonable) scales (see below).
const float max_scale = ui::GetScaleForScaleFactor(
ui::ResourceBundle::GetSharedInstance().GetMaxScaleFactor());
const float unreasonable_scale = max_scale * 32;
// TODO(reveman): Add support frames beyond 0 (crbug.com/750064).
if ((resource_id == -1) || (scale >= unreasonable_scale) || (frame > 0)) {
// Either we have no data to send back, or the requested scale is
// unreasonably large. This shouldn't happen normally, as chrome://theme/
// URLs are only used by WebUI pages and component extensions. However, the
// user can also enter these into the omnibox, so we need to fail
// gracefully.
callback.Run(nullptr);
} else if ((GetMimeType(path) == "image/png") &&
((scale > max_scale) || (frame != -1))) {
// This will extract and scale frame 0 of animated images.
// TODO(reveman): Support scaling of animated images and avoid scaling and
// re-encode when specific frame is specified (crbug.com/750064).
DCHECK_LE(frame, 0);
SendThemeImage(callback, resource_id, scale);
} else {
SendThemeBitmap(callback, resource_id, scale);
}
}
std::string ThemeSource::GetMimeType(const std::string& path) {
std::string parsed_path;
webui::ParsePathAndScale(GetThemeUrl(path), &parsed_path, nullptr);
return IsNewTabCssPath(parsed_path) ? "text/css" : "image/png";
}
scoped_refptr<base::SingleThreadTaskRunner>
ThemeSource::TaskRunnerForRequestPath(const std::string& path) {
std::string parsed_path;
webui::ParsePathAndScale(GetThemeUrl(path), &parsed_path, nullptr);
if (IsNewTabCssPath(parsed_path)) {
// We'll get this data from the NTPResourceCache, which must be accessed on
// the UI thread.
return content::URLDataSource::TaskRunnerForRequestPath(path);
}
// If it's not a themeable image, we don't need to go to the UI thread.
int resource_id = ResourcesUtil::GetThemeResourceId(parsed_path);
return BrowserThemePack::IsPersistentImageID(resource_id)
? content::URLDataSource::TaskRunnerForRequestPath(path)
: nullptr;
}
bool ThemeSource::AllowCaching() {
return false;
}
bool ThemeSource::ShouldServiceRequest(
const GURL& url,
content::ResourceContext* resource_context,
int render_process_id) {
return url.SchemeIs(chrome::kChromeSearchScheme)
? InstantIOContext::ShouldServiceRequest(url, resource_context,
render_process_id)
: URLDataSource::ShouldServiceRequest(url, resource_context,
render_process_id);
}
////////////////////////////////////////////////////////////////////////////////
// ThemeSource, private:
void ThemeSource::SendThemeBitmap(
const content::URLDataSource::GotDataCallback& callback,
int resource_id,
float scale) {
ui::ScaleFactor scale_factor = ui::GetSupportedScaleFactor(scale);
if (BrowserThemePack::IsPersistentImageID(resource_id)) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
scoped_refptr<base::RefCountedMemory> image_data(
ThemeService::GetThemeProviderForProfile(profile_->GetOriginalProfile())
.GetRawData(resource_id, scale_factor));
callback.Run(image_data.get());
} else {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
const ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
callback.Run(rb.LoadDataResourceBytesForScale(resource_id, scale_factor));
}
}
void ThemeSource::SendThemeImage(
const content::URLDataSource::GotDataCallback& callback,
int resource_id,
float scale) {
scoped_refptr<base::RefCountedBytes> data(new base::RefCountedBytes());
if (BrowserThemePack::IsPersistentImageID(resource_id)) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
const ui::ThemeProvider& tp = ThemeService::GetThemeProviderForProfile(
profile_->GetOriginalProfile());
ProcessImageOnUiThread(*tp.GetImageSkiaNamed(resource_id), scale, data);
callback.Run(data.get());
} else {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
// Fetching image data in ResourceBundle should happen on the UI thread. See
// crbug.com/449277
base::PostTaskAndReply(
FROM_HERE, {content::BrowserThread::UI},
base::BindOnce(&ProcessResourceOnUiThread, resource_id, scale, data),
base::BindOnce(callback, data));
}
}
std::string ThemeSource::GetAccessControlAllowOriginForOrigin(
const std::string& origin) {
std::string allowed_origin_prefix = content::kChromeUIScheme;
allowed_origin_prefix += "://";
if (base::StartsWith(origin, allowed_origin_prefix,
base::CompareCase::SENSITIVE)) {
return origin;
}
return content::URLDataSource::GetAccessControlAllowOriginForOrigin(origin);
}
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