1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "components/translate/core/browser/translate_script.h"
8 #include "base/command_line.h"
9 #include "base/logging.h"
10 #include "base/message_loop/message_loop.h"
11 #include "base/profiler/scoped_tracker.h"
12 #include "base/strings/string_piece.h"
13 #include "base/strings/string_util.h"
14 #include "base/strings/stringprintf.h"
15 #include "components/translate/core/browser/translate_url_fetcher.h"
16 #include "components/translate/core/browser/translate_url_util.h"
17 #include "components/translate/core/common/translate_switches.h"
18 #include "components/translate/core/common/translate_util.h"
19 #include "google_apis/google_api_keys.h"
20 #include "grit/components_resources.h"
21 #include "net/base/escape.h"
22 #include "net/base/url_util.h"
23 #include "ui/base/resource/resource_bundle.h"
29 const int kExpirationDelayDays = 1;
33 const char TranslateScript::kScriptURL[] =
34 "https://translate.google.com/translate_a/element.js";
35 const char TranslateScript::kRequestHeader[] =
36 "Google-Translate-Element-Mode: library";
37 const char TranslateScript::kAlwaysUseSslQueryName[] = "aus";
38 const char TranslateScript::kAlwaysUseSslQueryValue[] = "true";
39 const char TranslateScript::kCallbackQueryName[] = "cb";
40 const char TranslateScript::kCallbackQueryValue[] =
41 "cr.googleTranslate.onTranslateElementLoad";
42 const char TranslateScript::kCssLoaderCallbackQueryName[] = "clc";
43 const char TranslateScript::kCssLoaderCallbackQueryValue[] =
44 "cr.googleTranslate.onLoadCSS";
45 const char TranslateScript::kJavascriptLoaderCallbackQueryName[] = "jlc";
46 const char TranslateScript::kJavascriptLoaderCallbackQueryValue[] =
47 "cr.googleTranslate.onLoadJavascript";
49 TranslateScript::TranslateScript()
50 : expiration_delay_(base::TimeDelta::FromDays(kExpirationDelayDays)),
51 weak_method_factory_(this) {
54 TranslateScript::~TranslateScript() {
57 void TranslateScript::Request(const RequestCallback& callback) {
58 DCHECK(data_.empty()) << "Do not fetch the script if it is already fetched";
59 callback_list_.push_back(callback);
61 if (fetcher_.get() != NULL) {
62 // If there is already a request in progress, do nothing. |callback| will be
67 GURL translate_script_url;
68 // Check if command-line contains an alternative URL for translate service.
69 const CommandLine& command_line = *CommandLine::ForCurrentProcess();
70 if (command_line.HasSwitch(translate::switches::kTranslateScriptURL)) {
71 translate_script_url = GURL(command_line.GetSwitchValueASCII(
72 translate::switches::kTranslateScriptURL));
73 if (!translate_script_url.is_valid() ||
74 !translate_script_url.query().empty()) {
75 LOG(WARNING) << "The following translate URL specified at the "
76 << "command-line is invalid: "
77 << translate_script_url.spec();
78 translate_script_url = GURL();
82 // Use default URL when command-line argument is not specified, or specified
84 if (translate_script_url.is_empty())
85 translate_script_url = GURL(kScriptURL);
87 translate_script_url = net::AppendQueryParameter(
91 translate_script_url = net::AppendQueryParameter(
93 kAlwaysUseSslQueryName,
94 kAlwaysUseSslQueryValue);
96 // iOS doesn't need to use specific loaders for the isolated world.
97 translate_script_url = net::AppendQueryParameter(
99 kCssLoaderCallbackQueryName,
100 kCssLoaderCallbackQueryValue);
101 translate_script_url = net::AppendQueryParameter(
102 translate_script_url,
103 kJavascriptLoaderCallbackQueryName,
104 kJavascriptLoaderCallbackQueryValue);
105 #endif // !defined(OS_IOS)
107 translate_script_url = AddHostLocaleToUrl(translate_script_url);
108 translate_script_url = AddApiKeyToUrl(translate_script_url);
110 fetcher_.reset(new TranslateURLFetcher(kFetcherId));
111 fetcher_->set_extra_request_header(kRequestHeader);
113 translate_script_url,
114 base::Bind(&TranslateScript::OnScriptFetchComplete,
115 base::Unretained(this)));
119 void TranslateScript::OnScriptFetchComplete(
120 int id, bool success, const std::string& data) {
121 DCHECK_EQ(kFetcherId, id);
123 scoped_ptr<const TranslateURLFetcher> delete_ptr(fetcher_.release());
126 DCHECK(data_.empty());
127 // Insert variable definitions on API Key and security origin.
128 data_ = base::StringPrintf("var translateApiKey = '%s';\n",
129 google_apis::GetAPIKey().c_str());
131 GURL security_origin = translate::GetTranslateSecurityOrigin();
133 &data_, "var securityOrigin = '%s';", security_origin.spec().c_str());
135 // Append embedded translate.js and a remote element library.
136 base::StringPiece str = ResourceBundle::GetSharedInstance().
137 GetRawDataResource(IDR_TRANSLATE_JS);
138 str.AppendToString(&data_);
141 // We'll expire the cached script after some time, to make sure long
142 // running browsers still get fixes that might get pushed with newer
144 base::MessageLoop::current()->PostDelayedTask(
146 base::Bind(&TranslateScript::Clear,
147 weak_method_factory_.GetWeakPtr()),
151 for (RequestCallbackList::iterator it = callback_list_.begin();
152 it != callback_list_.end();
154 it->Run(success, data);
156 callback_list_.clear();
159 } // namespace translate