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.
4
5 #include "components/translate/core/browser/translate_script.h"
6
7 #include "base/bind.h"
8 #include "base/command_line.h"
9 #include "base/logging.h"
10 #include "base/message_loop/message_loop.h"
11 #include "base/strings/string_piece.h"
12 #include "base/strings/string_util.h"
13 #include "base/strings/stringprintf.h"
14 #include "components/translate/core/browser/translate_url_fetcher.h"
15 #include "components/translate/core/browser/translate_url_util.h"
16 #include "components/translate/core/common/translate_switches.h"
17 #include "components/translate/core/common/translate_util.h"
18 #include "google_apis/google_api_keys.h"
19 #include "grit/component_resources.h"
20 #include "net/base/escape.h"
21 #include "net/base/url_util.h"
22 #include "ui/base/resource/resource_bundle.h"
23
24 namespace {
25
26 const int kExpirationDelayDays = 1;
27
28 } // namespace
29
30 const char TranslateScript::kScriptURL[] =
31 "https://translate.google.com/translate_a/element.js";
32 const char TranslateScript::kRequestHeader[] =
33 "Google-Translate-Element-Mode: library";
34 const char TranslateScript::kAlwaysUseSslQueryName[] = "aus";
35 const char TranslateScript::kAlwaysUseSslQueryValue[] = "true";
36 const char TranslateScript::kCallbackQueryName[] = "cb";
37 const char TranslateScript::kCallbackQueryValue[] =
38 "cr.googleTranslate.onTranslateElementLoad";
39 const char TranslateScript::kCssLoaderCallbackQueryName[] = "clc";
40 const char TranslateScript::kCssLoaderCallbackQueryValue[] =
41 "cr.googleTranslate.onLoadCSS";
42 const char TranslateScript::kJavascriptLoaderCallbackQueryName[] = "jlc";
43 const char TranslateScript::kJavascriptLoaderCallbackQueryValue[] =
44 "cr.googleTranslate.onLoadJavascript";
45
TranslateScript()46 TranslateScript::TranslateScript()
47 : expiration_delay_(base::TimeDelta::FromDays(kExpirationDelayDays)),
48 weak_method_factory_(this) {
49 }
50
~TranslateScript()51 TranslateScript::~TranslateScript() {
52 }
53
Request(const RequestCallback & callback)54 void TranslateScript::Request(const RequestCallback& callback) {
55 DCHECK(data_.empty()) << "Do not fetch the script if it is already fetched";
56 callback_list_.push_back(callback);
57
58 if (fetcher_.get() != NULL) {
59 // If there is already a request in progress, do nothing. |callback| will be
60 // run on completion.
61 return;
62 }
63
64 GURL translate_script_url;
65 // Check if command-line contains an alternative URL for translate service.
66 const CommandLine& command_line = *CommandLine::ForCurrentProcess();
67 if (command_line.HasSwitch(translate::switches::kTranslateScriptURL)) {
68 translate_script_url = GURL(command_line.GetSwitchValueASCII(
69 translate::switches::kTranslateScriptURL));
70 if (!translate_script_url.is_valid() ||
71 !translate_script_url.query().empty()) {
72 LOG(WARNING) << "The following translate URL specified at the "
73 << "command-line is invalid: "
74 << translate_script_url.spec();
75 translate_script_url = GURL();
76 }
77 }
78
79 // Use default URL when command-line argument is not specified, or specified
80 // URL is invalid.
81 if (translate_script_url.is_empty())
82 translate_script_url = GURL(kScriptURL);
83
84 translate_script_url = net::AppendQueryParameter(
85 translate_script_url,
86 kCallbackQueryName,
87 kCallbackQueryValue);
88 translate_script_url = net::AppendQueryParameter(
89 translate_script_url,
90 kAlwaysUseSslQueryName,
91 kAlwaysUseSslQueryValue);
92 #if !defined(OS_IOS)
93 // iOS doesn't need to use specific loaders for the isolated world.
94 translate_script_url = net::AppendQueryParameter(
95 translate_script_url,
96 kCssLoaderCallbackQueryName,
97 kCssLoaderCallbackQueryValue);
98 translate_script_url = net::AppendQueryParameter(
99 translate_script_url,
100 kJavascriptLoaderCallbackQueryName,
101 kJavascriptLoaderCallbackQueryValue);
102 #endif // !defined(OS_IOS)
103
104 translate_script_url =
105 TranslateURLUtil::AddHostLocaleToUrl(translate_script_url);
106 translate_script_url =
107 TranslateURLUtil::AddApiKeyToUrl(translate_script_url);
108
109 fetcher_.reset(new TranslateURLFetcher(kFetcherId));
110 fetcher_->set_extra_request_header(kRequestHeader);
111 fetcher_->Request(
112 translate_script_url,
113 base::Bind(&TranslateScript::OnScriptFetchComplete,
114 base::Unretained(this)));
115 }
116
117
OnScriptFetchComplete(int id,bool success,const std::string & data)118 void TranslateScript::OnScriptFetchComplete(
119 int id, bool success, const std::string& data) {
120 DCHECK_EQ(kFetcherId, id);
121
122 scoped_ptr<const TranslateURLFetcher> delete_ptr(fetcher_.release());
123
124 if (success) {
125 DCHECK(data_.empty());
126 // Insert variable definitions on API Key and security origin.
127 data_ = base::StringPrintf("var translateApiKey = '%s';\n",
128 google_apis::GetAPIKey().c_str());
129
130 GURL security_origin = translate::GetTranslateSecurityOrigin();
131 base::StringAppendF(
132 &data_, "var securityOrigin = '%s';", security_origin.spec().c_str());
133
134 // Append embedded translate.js and a remote element library.
135 base::StringPiece str = ResourceBundle::GetSharedInstance().
136 GetRawDataResource(IDR_TRANSLATE_JS);
137 str.AppendToString(&data_);
138 data_ += data;
139
140 // We'll expire the cached script after some time, to make sure long
141 // running browsers still get fixes that might get pushed with newer
142 // scripts.
143 base::MessageLoop::current()->PostDelayedTask(
144 FROM_HERE,
145 base::Bind(&TranslateScript::Clear,
146 weak_method_factory_.GetWeakPtr()),
147 expiration_delay_);
148 }
149
150 for (RequestCallbackList::iterator it = callback_list_.begin();
151 it != callback_list_.end();
152 ++it) {
153 it->Run(success, data);
154 }
155 callback_list_.clear();
156 }
157