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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/translate/translate_script.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/string_piece.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "chrome/browser/translate/translate_url_fetcher.h"
#include "chrome/browser/translate/translate_url_util.h"
#include "chrome/common/chrome_switches.h"
#include "google_apis/google_api_keys.h"
#include "grit/browser_resources.h"
#include "net/base/escape.h"
#include "net/base/url_util.h"
#include "ui/base/resource/resource_bundle.h"
namespace {
const int kExpirationDelayDays = 1;
const char kScriptURL[] =
"https://translate.google.com/translate_a/element.js";
const char kRequestHeader[] = "Google-Translate-Element-Mode: library";
// Used in kTranslateScriptURL to specify a callback function name.
const char kCallbackQueryName[] = "cb";
const char kCallbackQueryValue[] =
"cr.googleTranslate.onTranslateElementLoad";
// Used in kTranslateScriptURL to specify using always ssl to load resources.
const char kAlwaysUseSslQueryName[] = "aus";
const char kAlwaysUseSslQueryValue[] = "true";
// Used in kTranslateScriptURL to specify a CSS loader callback function name.
const char kCssLoaderCallbackQueryName[] = "clc";
const char kCssLoaderCallbackQueryValue[] = "cr.googleTranslate.onLoadCSS";
// Used in kTranslateScriptURL to specify a JavaScript loader callback function
// name.
const char kJavascriptLoaderCallbackQueryName[] = "jlc";
const char kJavascriptLoaderCallbackQueryValue[] =
"cr.googleTranslate.onLoadJavascript";
} // namespace
TranslateScript::TranslateScript()
: weak_method_factory_(this),
expiration_delay_(base::TimeDelta::FromDays(kExpirationDelayDays)) {
}
TranslateScript::~TranslateScript() {
weak_method_factory_.InvalidateWeakPtrs();
}
void TranslateScript::Request(const Callback& callback) {
if (fetcher_.get() != NULL) {
NOTREACHED();
return;
}
callback_ = callback;
GURL translate_script_url;
// Check if command-line contains an alternative URL for translate service.
const CommandLine& command_line = *CommandLine::ForCurrentProcess();
if (command_line.HasSwitch(switches::kTranslateScriptURL)) {
translate_script_url = GURL(
command_line.GetSwitchValueASCII(switches::kTranslateScriptURL));
if (!translate_script_url.is_valid() ||
!translate_script_url.query().empty()) {
LOG(WARNING) << "The following translate URL specified at the "
<< "command-line is invalid: "
<< translate_script_url.spec();
translate_script_url = GURL();
}
}
// Use default URL when command-line argument is not specified, or specified
// URL is invalid.
if (translate_script_url.is_empty())
translate_script_url = GURL(kScriptURL);
translate_script_url = net::AppendQueryParameter(
translate_script_url,
kCallbackQueryName,
kCallbackQueryValue);
translate_script_url = net::AppendQueryParameter(
translate_script_url,
kAlwaysUseSslQueryName,
kAlwaysUseSslQueryValue);
translate_script_url = net::AppendQueryParameter(
translate_script_url,
kCssLoaderCallbackQueryName,
kCssLoaderCallbackQueryValue);
translate_script_url = net::AppendQueryParameter(
translate_script_url,
kJavascriptLoaderCallbackQueryName,
kJavascriptLoaderCallbackQueryValue);
translate_script_url =
TranslateURLUtil::AddHostLocaleToUrl(translate_script_url);
translate_script_url =
TranslateURLUtil::AddApiKeyToUrl(translate_script_url);
fetcher_.reset(new TranslateURLFetcher(kFetcherId));
fetcher_->set_extra_request_header(kRequestHeader);
fetcher_->Request(
translate_script_url,
base::Bind(&TranslateScript::OnScriptFetchComplete,
base::Unretained(this)));
}
void TranslateScript::OnScriptFetchComplete(
int id, bool success, const std::string& data) {
DCHECK_EQ(kFetcherId, id);
scoped_ptr<const TranslateURLFetcher> delete_ptr(fetcher_.release());
if (success) {
DCHECK(data_.empty());
data_ = base::StringPrintf("var translateApiKey = '%s';\n",
google_apis::GetAPIKey().c_str());
base::StringPiece str = ResourceBundle::GetSharedInstance().
GetRawDataResource(IDR_TRANSLATE_JS);
str.AppendToString(&data_);
data_ += data;
// We'll expire the cached script after some time, to make sure long
// running browsers still get fixes that might get pushed with newer
// scripts.
base::MessageLoop::current()->PostDelayedTask(
FROM_HERE,
base::Bind(&TranslateScript::Clear,
weak_method_factory_.GetWeakPtr()),
expiration_delay_);
}
callback_.Run(success, data);
}
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