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// Copyright 2013 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 "ui/base/webui/web_ui_util.h"
#include <vector>
#include "base/base64.h"
#include "base/feature_list.h"
#include "base/i18n/rtl.h"
#include "base/logging.h"
#include "base/memory/ref_counted_memory.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_piece.h"
#include "base/strings/string_util.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "build/chromeos_buildflags.h"
#include "net/base/escape.h"
#include "third_party/modp_b64/modp_b64.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/base/template_expressions.h"
#include "ui/base/window_open_disposition.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/font.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/resources/grit/webui_generated_resources.h"
#include "ui/strings/grit/app_locale_settings.h"
#include "url/gurl.h"
#if defined(OS_WIN)
#include "base/win/windows_version.h"
#endif
namespace webui {
namespace {
std::string GetWebUiCssTextDefaults(const std::string& css_template) {
ui::TemplateReplacements placeholders;
placeholders["textDirection"] = GetTextDirection();
placeholders["fontFamily"] = GetFontFamily();
placeholders["fontSize"] = GetFontSize();
return ui::ReplaceTemplateExpressions(css_template, placeholders);
}
} // namespace
std::string GetBitmapDataUrl(const SkBitmap& bitmap) {
TRACE_EVENT2("ui", "GetBitmapDataUrl", "width", bitmap.width(), "height",
bitmap.height());
std::vector<unsigned char> output;
gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, false, &output);
return GetPngDataUrl(output.data(), output.size());
}
std::string GetPngDataUrl(const unsigned char* data, size_t size) {
constexpr char kPrefix[] = "data:image/png;base64,";
constexpr size_t kPrefixLen = base::size(kPrefix) - 1;
// Includes room for trailing null byte.
size_t max_encode_len = modp_b64_encode_len(size);
std::string output;
// This initializes the characters in the string, but there's no good way to
// avoid that and maintain a std::string API.
output.resize(kPrefixLen + max_encode_len);
memcpy(&output[0], kPrefix, kPrefixLen);
// |max_encode_len| is >= 1, so &output[kPrefixLen] is valid.
size_t actual_encode_len = modp_b64_encode(
&output[kPrefixLen], reinterpret_cast<const char*>(data), size);
output.resize(kPrefixLen + actual_encode_len);
return output;
}
WindowOpenDisposition GetDispositionFromClick(const base::ListValue* args,
int start_index) {
double button = 0.0;
bool alt_key = false;
bool ctrl_key = false;
bool meta_key = false;
bool shift_key = false;
CHECK(args->GetDouble(start_index++, &button));
CHECK(args->GetBoolean(start_index++, &alt_key));
CHECK(args->GetBoolean(start_index++, &ctrl_key));
CHECK(args->GetBoolean(start_index++, &meta_key));
CHECK(args->GetBoolean(start_index++, &shift_key));
return ui::DispositionFromClick(
button == 1.0, alt_key, ctrl_key, meta_key, shift_key);
}
bool ParseScaleFactor(const base::StringPiece& identifier,
float* scale_factor) {
*scale_factor = 1.0f;
if (identifier.empty()) {
LOG(WARNING) << "Invalid scale factor format: " << identifier;
return false;
}
if (*identifier.rbegin() != 'x') {
LOG(WARNING) << "Invalid scale factor format: " << identifier;
return false;
}
double scale = 0;
std::string stripped(identifier.substr(0, identifier.length() - 1));
if (!base::StringToDouble(stripped, &scale)) {
LOG(WARNING) << "Invalid scale factor format: " << identifier;
return false;
}
*scale_factor = static_cast<float>(scale);
return true;
}
// Parse a formatted frame index string into int and sets to |frame_index|.
bool ParseFrameIndex(const base::StringPiece& identifier, int* frame_index) {
*frame_index = -1;
if (identifier.empty()) {
LOG(WARNING) << "Invalid frame index format: " << identifier;
return false;
}
if (*identifier.rbegin() != ']') {
LOG(WARNING) << "Invalid frame index format: " << identifier;
return false;
}
unsigned frame = 0;
if (!base::StringToUint(identifier.substr(0, identifier.length() - 1),
&frame)) {
LOG(WARNING) << "Invalid frame index format: " << identifier;
return false;
}
*frame_index = static_cast<int>(frame);
return true;
}
void ParsePathAndImageSpec(const GURL& url,
std::string* path,
float* scale_factor,
int* frame_index) {
*path = net::UnescapeBinaryURLComponent(url.path_piece().substr(1));
if (scale_factor)
*scale_factor = 1.0f;
if (frame_index)
*frame_index = -1;
// Detect and parse resource string ending in @<scale>x.
std::size_t pos = path->rfind('@');
if (pos != std::string::npos) {
base::StringPiece stripped_path(*path);
float factor;
if (ParseScaleFactor(stripped_path.substr(
pos + 1, stripped_path.length() - pos - 1), &factor)) {
// Strip scale factor specification from path.
stripped_path.remove_suffix(stripped_path.length() - pos);
path->assign(stripped_path.data(), stripped_path.size());
}
if (scale_factor)
*scale_factor = factor;
}
// Detect and parse resource string ending in [<frame>].
pos = path->rfind('[');
if (pos != std::string::npos) {
base::StringPiece stripped_path(*path);
int index;
if (ParseFrameIndex(
stripped_path.substr(pos + 1, stripped_path.length() - pos - 1),
&index)) {
// Strip frame index specification from path.
stripped_path.remove_suffix(stripped_path.length() - pos);
path->assign(stripped_path.data(), stripped_path.size());
}
if (frame_index)
*frame_index = index;
}
}
void ParsePathAndScale(const GURL& url,
std::string* path,
float* scale_factor) {
ParsePathAndImageSpec(url, path, scale_factor, nullptr);
}
void SetLoadTimeDataDefaults(const std::string& app_locale,
base::DictionaryValue* localized_strings) {
localized_strings->SetString("fontfamily", GetFontFamily());
localized_strings->SetString("fontsize", GetFontSize());
localized_strings->SetString("language", l10n_util::GetLanguage(app_locale));
localized_strings->SetString("textdirection", GetTextDirection());
}
void SetLoadTimeDataDefaults(const std::string& app_locale,
ui::TemplateReplacements* replacements) {
(*replacements)["fontfamily"] = GetFontFamily();
(*replacements)["fontsize"] = GetFontSize();
(*replacements)["language"] = l10n_util::GetLanguage(app_locale);
(*replacements)["textdirection"] = GetTextDirection();
}
std::string GetWebUiCssTextDefaults() {
const ui::ResourceBundle& resource_bundle =
ui::ResourceBundle::GetSharedInstance();
return GetWebUiCssTextDefaults(
resource_bundle.LoadDataResourceString(IDR_WEBUI_CSS_TEXT_DEFAULTS_CSS));
}
std::string GetWebUiCssTextDefaultsMd() {
const ui::ResourceBundle& resource_bundle =
ui::ResourceBundle::GetSharedInstance();
return GetWebUiCssTextDefaults(resource_bundle.LoadDataResourceString(
IDR_WEBUI_CSS_TEXT_DEFAULTS_MD_CSS));
}
void AppendWebUiCssTextDefaults(std::string* html) {
html->append("<style>");
html->append(GetWebUiCssTextDefaults());
html->append("</style>");
}
std::string GetFontFamily() {
std::string font_family = l10n_util::GetStringUTF8(IDS_WEB_FONT_FAMILY);
// TODO(crbug.com/1052397): Revisit the macro expression once build flag switch
// of lacros-chrome is complete.
#if defined(OS_LINUX) || BUILDFLAG(IS_CHROMEOS_LACROS)
std::string font_name = ui::ResourceBundle::GetSharedInstance()
.GetFont(ui::ResourceBundle::BaseFont)
.GetFontName();
// Wrap |font_name| with quotes to ensure it will always be parsed correctly
// in CSS.
font_family = "\"" + font_name + "\", " + font_family;
#endif
return font_family;
}
std::string GetFontSize() {
return l10n_util::GetStringUTF8(IDS_WEB_FONT_SIZE);
}
std::string GetTextDirection() {
return base::i18n::IsRTL() ? "rtl" : "ltr";
}
} // namespace webui