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// Copyright (c) 2010 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 <string>
#include <vector>
#include "base/base64.h"
#include "base/file_path.h"
#include "base/file_util.h"
#include "base/path_service.h"
#include "base/scoped_temp_dir.h"
#include "base/sha2.h"
#include "base/stringprintf.h"
#include "base/time.h"
#include "base/utf_string_conversions.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/extensions/extension.h"
#include "chrome/common/extensions/extension_constants.h"
#include "chrome/common/json_value_serializer.h"
#include "gfx/codec/png_codec.h"
#include "googleurl/src/gurl.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "webkit/glue/dom_operations.h"
namespace keys = extension_manifest_keys;
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[base::SHA256_LENGTH] = {0};
std::string key;
base::SHA256HashString(manifest_url.spec().c_str(),
raw,
base::SHA256_LENGTH);
base::Base64Encode(std::string(raw, base::SHA256_LENGTH), &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 base::Time& create_time) {
base::Time::Exploded create_time_exploded;
create_time.LocalExplode(&create_time_exploded);
uint32 timestamp = static_cast<uint>(create_time.ToDoubleT());
uint16 timestamp_lower = static_cast<uint16>(timestamp);
uint16 timestamp_upper = static_cast<uint16>(timestamp >> 16);
return base::StringPrintf("%i.%i%.2i.%i.%i",
create_time_exploded.year,
create_time_exploded.month,
create_time_exploded.day_of_month,
timestamp_upper,
timestamp_lower);
}
scoped_refptr<Extension> ConvertWebAppToExtension(
const webkit_glue::WebApplicationInfo& web_app,
const base::Time& create_time) {
FilePath user_data_temp_dir;
CHECK(PathService::Get(chrome::DIR_USER_DATA_TEMP, &user_data_temp_dir));
ScopedTempDir temp_dir;
if (!temp_dir.CreateUniqueTempDirUnderPath(user_data_temp_dir)) {
LOG(ERROR) << "Could not create temporary directory.";
return NULL;
}
// Create the manifest
scoped_ptr<DictionaryValue> root(new DictionaryValue);
root->SetString(keys::kPublicKey, GenerateKey(web_app.manifest_url));
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());
// 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 = StringPrintf("%i", web_app.icons[i].width);
std::string icon_path = StringPrintf("%s/%s.png", kIconsDirName,
size.c_str());
icons->SetString(size, icon_path);
}
// Add the permissions.
ListValue* permissions = new 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.
ListValue* urls = new 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.
FilePath manifest_path = temp_dir.path().Append(
Extension::kManifestFilename);
JSONFileValueSerializer serializer(manifest_path);
if (!serializer.Serialize(*root)) {
LOG(ERROR) << "Could not serialize manifest.";
return NULL;
}
// Write the icon files.
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) {
FilePath icon_file = icons_dir.AppendASCII(
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;
scoped_refptr<Extension> extension = Extension::Create(
temp_dir.path(), Extension::INTERNAL, *root, false, &error);
if (!extension) {
LOG(ERROR) << error;
return NULL;
}
temp_dir.Take(); // The caller takes ownership of the directory.
return extension;
}