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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/extensions/convert_web_app.h"
#include <cmath>
#include <limits>
#include <string>
#include <vector>
#include "base/base64.h"
#include "base/file_util.h"
#include "base/files/file_path.h"
#include "base/files/scoped_temp_dir.h"
#include "base/json/json_file_value_serializer.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/time/time.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/extensions/extension.h"
#include "chrome/common/extensions/extension_file_util.h"
#include "chrome/common/extensions/extension_manifest_constants.h"
#include "chrome/common/web_application_info.h"
#include "crypto/sha2.h"
#include "extensions/common/constants.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/codec/png_codec.h"
#include "url/gurl.h"
namespace extensions {
namespace keys = extension_manifest_keys;
using base::Time;
namespace {
const char kIconsDirName[] = "icons";
// Create the public key for the converted web app.
//
// Web apps are not signed, but the public key for an extension doubles as
// its unique identity, and we need one of those. A web app's unique identity
// is its manifest URL, so we hash that to create a public key. There will be
// no corresponding private key, which means that these extensions cannot be
// auto-updated using ExtensionUpdater. But Chrome does notice updates to the
// manifest and regenerates these extensions.
std::string GenerateKey(const GURL& manifest_url) {
char raw[crypto::kSHA256Length] = {0};
std::string key;
crypto::SHA256HashString(manifest_url.spec().c_str(), raw,
crypto::kSHA256Length);
base::Base64Encode(std::string(raw, crypto::kSHA256Length), &key);
return key;
}
}
// Generates a version for the converted app using the current date. This isn't
// really needed, but it seems like useful information.
std::string ConvertTimeToExtensionVersion(const Time& create_time) {
Time::Exploded create_time_exploded;
create_time.UTCExplode(&create_time_exploded);
double micros = static_cast<double>(
(create_time_exploded.millisecond * Time::kMicrosecondsPerMillisecond) +
(create_time_exploded.second * Time::kMicrosecondsPerSecond) +
(create_time_exploded.minute * Time::kMicrosecondsPerMinute) +
(create_time_exploded.hour * Time::kMicrosecondsPerHour));
double day_fraction = micros / Time::kMicrosecondsPerDay;
double stamp = day_fraction * std::numeric_limits<uint16>::max();
// Ghetto-round, since VC++ doesn't have round().
stamp = stamp >= (floor(stamp) + 0.5) ? (stamp + 1) : stamp;
return base::StringPrintf("%i.%i.%i.%i",
create_time_exploded.year,
create_time_exploded.month,
create_time_exploded.day_of_month,
static_cast<uint16>(stamp));
}
scoped_refptr<Extension> ConvertWebAppToExtension(
const WebApplicationInfo& web_app,
const Time& create_time,
const base::FilePath& extensions_dir) {
base::FilePath install_temp_dir =
extension_file_util::GetInstallTempDir(extensions_dir);
if (install_temp_dir.empty()) {
LOG(ERROR) << "Could not get path to profile temporary directory.";
return NULL;
}
base::ScopedTempDir temp_dir;
if (!temp_dir.CreateUniqueTempDirUnderPath(install_temp_dir)) {
LOG(ERROR) << "Could not create temporary directory.";
return NULL;
}
// Create the manifest
scoped_ptr<DictionaryValue> root(new DictionaryValue);
if (!web_app.is_bookmark_app)
root->SetString(keys::kPublicKey, GenerateKey(web_app.manifest_url));
else
root->SetString(keys::kPublicKey, GenerateKey(web_app.app_url));
if (web_app.is_offline_enabled)
root->SetBoolean(keys::kOfflineEnabled, true);
root->SetString(keys::kName, UTF16ToUTF8(web_app.title));
root->SetString(keys::kVersion, ConvertTimeToExtensionVersion(create_time));
root->SetString(keys::kDescription, UTF16ToUTF8(web_app.description));
root->SetString(keys::kLaunchWebURL, web_app.app_url.spec());
if (!web_app.launch_container.empty())
root->SetString(keys::kLaunchContainer, web_app.launch_container);
// Add the icons.
DictionaryValue* icons = new DictionaryValue();
root->Set(keys::kIcons, icons);
for (size_t i = 0; i < web_app.icons.size(); ++i) {
std::string size = base::StringPrintf("%i", web_app.icons[i].width);
std::string icon_path = base::StringPrintf("%s/%s.png", kIconsDirName,
size.c_str());
icons->SetString(size, icon_path);
}
// Add the permissions.
base::ListValue* permissions = new base::ListValue();
root->Set(keys::kPermissions, permissions);
for (size_t i = 0; i < web_app.permissions.size(); ++i) {
permissions->Append(Value::CreateStringValue(web_app.permissions[i]));
}
// Add the URLs.
base::ListValue* urls = new base::ListValue();
root->Set(keys::kWebURLs, urls);
for (size_t i = 0; i < web_app.urls.size(); ++i) {
urls->Append(Value::CreateStringValue(web_app.urls[i].spec()));
}
// Write the manifest.
base::FilePath manifest_path = temp_dir.path().Append(kManifestFilename);
JSONFileValueSerializer serializer(manifest_path);
if (!serializer.Serialize(*root)) {
LOG(ERROR) << "Could not serialize manifest.";
return NULL;
}
// Write the icon files.
base::FilePath icons_dir = temp_dir.path().AppendASCII(kIconsDirName);
if (!file_util::CreateDirectory(icons_dir)) {
LOG(ERROR) << "Could not create icons directory.";
return NULL;
}
for (size_t i = 0; i < web_app.icons.size(); ++i) {
// Skip unfetched bitmaps.
if (web_app.icons[i].data.config() == SkBitmap::kNo_Config)
continue;
base::FilePath icon_file = icons_dir.AppendASCII(
base::StringPrintf("%i.png", web_app.icons[i].width));
std::vector<unsigned char> image_data;
if (!gfx::PNGCodec::EncodeBGRASkBitmap(web_app.icons[i].data,
false,
&image_data)) {
LOG(ERROR) << "Could not create icon file.";
return NULL;
}
const char* image_data_ptr = reinterpret_cast<const char*>(&image_data[0]);
if (!file_util::WriteFile(icon_file, image_data_ptr, image_data.size())) {
LOG(ERROR) << "Could not write icon file.";
return NULL;
}
}
// Finally, create the extension object to represent the unpacked directory.
std::string error;
int extension_flags = Extension::NO_FLAGS;
if (web_app.is_bookmark_app)
extension_flags |= Extension::FROM_BOOKMARK;
scoped_refptr<Extension> extension = Extension::Create(
temp_dir.path(),
Manifest::INTERNAL,
*root,
extension_flags,
&error);
if (!extension.get()) {
LOG(ERROR) << error;
return NULL;
}
temp_dir.Take(); // The caller takes ownership of the directory.
return extension;
}
} // namespace extensions
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