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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 "chrome/browser/extensions/webstore_data_fetcher.h"
#include "base/values.h"
#include "chrome/browser/extensions/webstore_data_fetcher_delegate.h"
#include "chrome/common/chrome_utility_messages.h"
#include "chrome/common/extensions/extension_constants.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/utility_process_host.h"
#include "content/public/browser/utility_process_host_client.h"
#include "net/base/load_flags.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_request_status.h"
using content::BrowserThread;
using content::UtilityProcessHost;
using content::UtilityProcessHostClient;
namespace {
const char kInvalidWebstoreResponseError[] = "Invalid Chrome Web Store reponse";
} // namespace
namespace extensions {
class WebstoreDataFetcher::SafeWebstoreResponseParser
: public UtilityProcessHostClient {
public:
SafeWebstoreResponseParser(const base::WeakPtr<WebstoreDataFetcher>& client,
const std::string& webstore_data)
: client_(client),
webstore_data_(webstore_data) {}
void Start() {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
BrowserThread::PostTask(
BrowserThread::IO,
FROM_HERE,
base::Bind(&SafeWebstoreResponseParser::StartWorkOnIOThread, this));
}
void StartWorkOnIOThread() {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
UtilityProcessHost* host =
UtilityProcessHost::Create(
this, base::MessageLoopProxy::current());
host->EnableZygote();
host->Send(new ChromeUtilityMsg_ParseJSON(webstore_data_));
}
// Implementing pieces of the UtilityProcessHostClient interface.
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(SafeWebstoreResponseParser, message)
IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_ParseJSON_Succeeded,
OnJSONParseSucceeded)
IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_ParseJSON_Failed,
OnJSONParseFailed)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
void OnJSONParseSucceeded(const base::ListValue& wrapper) {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
const Value* value = NULL;
CHECK(wrapper.Get(0, &value));
if (value->IsType(Value::TYPE_DICTIONARY)) {
parsed_webstore_data_.reset(
static_cast<const DictionaryValue*>(value)->DeepCopy());
} else {
error_ = kInvalidWebstoreResponseError;
}
ReportResults();
}
virtual void OnJSONParseFailed(const std::string& error_message) {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
error_ = error_message;
ReportResults();
}
void ReportResults() {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
BrowserThread::PostTask(
BrowserThread::UI,
FROM_HERE,
base::Bind(&SafeWebstoreResponseParser::ReportResultOnUIThread, this));
}
void ReportResultOnUIThread() {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (!client_)
return;
if (error_.empty() && parsed_webstore_data_) {
client_->OnWebstoreResponseParseSuccess(parsed_webstore_data_.release());
} else {
client_->OnWebstoreResponseParseFailure(error_);
}
}
private:
virtual ~SafeWebstoreResponseParser() {}
base::WeakPtr<WebstoreDataFetcher> client_;
std::string webstore_data_;
std::string error_;
scoped_ptr<DictionaryValue> parsed_webstore_data_;
DISALLOW_COPY_AND_ASSIGN(SafeWebstoreResponseParser);
};
WebstoreDataFetcher::WebstoreDataFetcher(
WebstoreDataFetcherDelegate* delegate,
net::URLRequestContextGetter* request_context,
const GURL& referrer_url,
const std::string webstore_item_id)
: delegate_(delegate),
request_context_(request_context),
referrer_url_(referrer_url),
id_(webstore_item_id) {
}
WebstoreDataFetcher::~WebstoreDataFetcher() {}
void WebstoreDataFetcher::Start() {
GURL webstore_data_url(extension_urls::GetWebstoreItemJsonDataURL(id_));
webstore_data_url_fetcher_.reset(net::URLFetcher::Create(
webstore_data_url, net::URLFetcher::GET, this));
webstore_data_url_fetcher_->SetRequestContext(request_context_);
webstore_data_url_fetcher_->SetReferrer(referrer_url_.spec());
webstore_data_url_fetcher_->SetLoadFlags(net::LOAD_DO_NOT_SAVE_COOKIES |
net::LOAD_DISABLE_CACHE);
webstore_data_url_fetcher_->Start();
}
void WebstoreDataFetcher::OnWebstoreResponseParseSuccess(
base::DictionaryValue* webstore_data) {
delegate_->OnWebstoreResponseParseSuccess(webstore_data);
}
void WebstoreDataFetcher::OnWebstoreResponseParseFailure(
const std::string& error) {
delegate_->OnWebstoreResponseParseFailure(error);
}
void WebstoreDataFetcher::OnURLFetchComplete(const net::URLFetcher* source) {
CHECK_EQ(webstore_data_url_fetcher_.get(), source);
scoped_ptr<net::URLFetcher> fetcher(webstore_data_url_fetcher_.Pass());
if (!fetcher->GetStatus().is_success() ||
fetcher->GetResponseCode() != 200) {
delegate_->OnWebstoreRequestFailure();
return;
}
std::string webstore_json_data;
fetcher->GetResponseAsString(&webstore_json_data);
scoped_refptr<SafeWebstoreResponseParser> parser =
new SafeWebstoreResponseParser(AsWeakPtr(), webstore_json_data);
// The parser will call us back via OnWebstoreResponseParseSucces or
// OnWebstoreResponseParseFailure.
parser->Start();
}
} // namespace extensions
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