Move DNS resolution from websocket-to-TCP proxy to ExtensionFunction

chrome/browser/extensions/extension_web_socket_proxy_private_api.cc

 // Copyright (c) 2011 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/extension_web_socket_proxy_private_api.h"
 
 #include "base/logging.h"
+#include "base/stl_util.h"
+#include "base/string_number_conversions.h"
 #include "base/values.h"
-#include "base/string_number_conversions.h"
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/internal_auth.h"
+#include "chrome/browser/io_thread.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/extensions/extension.h"
+#include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_details.h"
 #include "net/base/escape.h"
+#include "net/base/net_errors.h"
+#include "net/base/net_log.h"
+#include "net/base/net_util.h"
+#include "net/base/single_request_host_resolver.h"
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/web_socket_proxy_controller.h"
 #endif
 
 namespace {
 const char kPermissionDeniedError[] =
     "Extension does not have permission to use this method.";
 }
 
 WebSocketProxyPrivate::WebSocketProxyPrivate()
-    : is_finalized_(false), listening_port_(-1) {
+    : listening_port_(-1), do_tls_(false), is_finalized_(false){
 }
 
 WebSocketProxyPrivate::~WebSocketProxyPrivate() {
 }
 
-void WebSocketProxyPrivate::Observe(
-    int type, const content::NotificationSource& source,
-    const content::NotificationDetails& details) {
-#if defined(OS_CHROMEOS)
-  DCHECK_EQ(chrome::NOTIFICATION_WEB_SOCKET_PROXY_STARTED, type);
-#else
-  NOTREACHED();
-#endif
-  timer_.Stop();  // Cancel timeout timer.
-  Finalize();
-}
+void WebSocketProxyPrivate::Finalize() {
+  CustomFinalize();
 
-void WebSocketProxyPrivate::Finalize() {
   if (is_finalized_)
     return;
   is_finalized_ = true;
   SendResponse(listening_port_ > 0);
   Release();
 }
 
-void WebSocketProxyPrivateGetURLForTCPFunction::Observe(
+void WebSocketProxyPrivate::Observe(
     int type, const content::NotificationSource& source,
     const content::NotificationDetails& details) {
-  listening_port_ = *content::Details<int>(details).ptr();
-  WebSocketProxyPrivate::Observe(type, source, details);
+#if defined(OS_CHROMEOS)
+  DCHECK_EQ(chrome::NOTIFICATION_WEB_SOCKET_PROXY_STARTED, type);
+#else
+  NOTREACHED();
+#endif
+
+  timer_.Stop();  // Cancel timeout timer.
+  ResolveHost();
 }
 
-void WebSocketProxyPrivateGetURLForTCPFunction::Finalize() {
+void WebSocketProxyPrivate::ResolveHost() {
 #if defined(OS_CHROMEOS)
-  if (listening_port_ < 1)
-    listening_port_ = chromeos::WebSocketProxyController::GetPort();
-  StringValue* url = Value::CreateStringValue(std::string(
-      "ws://127.0.0.1:" + base::IntToString(listening_port_) +
-      "/tcpproxy?" + query_));
-  result_.reset(url);
+  if (!content::BrowserThread::CurrentlyOn(content::BrowserThread::IO)) {
+    content::BrowserThread::PostTask(content::BrowserThread::IO, FROM_HERE,
+        base::Bind(&WebSocketProxyPrivate::ResolveHost, this));
+    return;
+  }
+  DCHECK(resolver_ == NULL);
+  if (g_browser_process) {
+    IOThread* io_thread = g_browser_process->io_thread();
+    if (io_thread && io_thread->globals()) {
+      net::HostResolver* host_resolver =
+          io_thread->globals()->host_resolver.get();
+      if (host_resolver) {
+        resolver_.reset(new net::SingleRequestHostResolver(host_resolver));
+        net::HostResolver::RequestInfo info(net::HostPortPair(
+            hostname_, port_));
+        int result = resolver_->Resolve(info, &addr_,
+            base::Bind(&WebSocketProxyPrivate::OnHostResolution, this),
+            net::BoundNetLog());
+        if (result != net::ERR_IO_PENDING)
+          OnHostResolution(result);
+        return;
+      }
+    }
+  }
+  NOTREACHED();
+  OnHostResolution(net::ERR_UNEXPECTED);
 #endif
-  WebSocketProxyPrivate::Finalize();
 }
 
-bool WebSocketProxyPrivateGetURLForTCPFunction::RunImpl() {
+bool WebSocketProxyPrivate::RunImpl() {
   AddRef();
-  bool delay_response = false;
   result_.reset(Value::CreateStringValue(""));
 
 #if defined(OS_CHROMEOS)
-  std::string hostname;
-  EXTENSION_FUNCTION_VALIDATE(args_->GetString(0, &hostname));
-  int port = -1;
-  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(1, &port));
-  bool do_tls = false;
-  DictionaryValue* qualification = NULL;
-  if (args_->GetDictionary(2, &qualification)) {
-    const char kTlsOption[] = "tls";
-    if (qualification->HasKey(kTlsOption)) {
-      EXTENSION_FUNCTION_VALIDATE(qualification->GetBoolean(
-          kTlsOption, &do_tls));
-    }
-  }
+  bool delay_response = false;
+
+  EXTENSION_FUNCTION_VALIDATE(args_->GetString(0, &hostname_));
+  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(1, &port_));
+
   if (chromeos::WebSocketProxyController::CheckCredentials(
-          extension_id(), hostname, port,
-          do_tls ? chromeos::WebSocketProxyController::TLS_OVER_TCP :
+          extension_id(), hostname_, port_,
+          do_tls_ ? chromeos::WebSocketProxyController::TLS_OVER_TCP :
               chromeos::WebSocketProxyController::PLAIN_TCP)) {
     listening_port_ = chromeos::WebSocketProxyController::GetPort();
     if (listening_port_ < 1) {
       delay_response = true;
       registrar_.Add(
           this, chrome::NOTIFICATION_WEB_SOCKET_PROXY_STARTED,
           content::NotificationService::AllSources());
     }
-
-    std::map<std::string, std::string> map;
-    map["hostname"] = hostname;
-    map["port"] = base::IntToString(port);
-    map["extension_id"] = extension_id();
-    map["tls"] = do_tls ? "true" : "false";
-    std::string passport = browser::InternalAuthGeneration::GeneratePassport(
-        "web_socket_proxy", map);
-    query_ = std::string("hostname=") +
-        net::EscapeQueryParamValue(hostname, false) + "&port=" + map["port"] +
-        "&tls=" + map["tls"] + "&passport=" +
-        net::EscapeQueryParamValue(passport, false);
+    map_["hostname"] = hostname_;
+    map_["port"] = base::IntToString(port_);
+    map_["extension_id"] = extension_id();
   } else {
     error_ = kPermissionDeniedError;
     return false;
   }
-#endif  // defined(OS_CHROMEOS)
 
   if (delay_response) {
     const int kTimeout = 12;
     timer_.Start(FROM_HERE, base::TimeDelta::FromSeconds(kTimeout),
-        this, &WebSocketProxyPrivate::Finalize);
+        this, &WebSocketProxyPrivate::ResolveHost);
   } else {
-    Finalize();
+    ResolveHost();
   }
+#else
+  Finalize();
+#endif
+
   return true;
 }
 
+void WebSocketProxyPrivate::OnHostResolution(int result) {
+#if defined(OS_CHROMEOS)
+  if (result == 0 && addr_.head() != NULL) {
+    std::string ip = net::NetAddressToString(addr_.head());
+    if (!ip.empty() && ip.find(':') != std::string::npos && ip[0] != '[')
+      ip = '[' + ip + ']';
+    map_["addr"] = ip;
+  }
+  content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
+      base::Bind(&WebSocketProxyPrivate::Finalize, this));
+#endif
+}
+
+WebSocketProxyPrivateGetURLForTCPFunction::
+    WebSocketProxyPrivateGetURLForTCPFunction() {
+}
+
+WebSocketProxyPrivateGetURLForTCPFunction::
+    ~WebSocketProxyPrivateGetURLForTCPFunction() {
+}
+
+void WebSocketProxyPrivateGetURLForTCPFunction::CustomFinalize() {
+#if defined(OS_CHROMEOS)
+  std::string passport = browser::InternalAuthGeneration::GeneratePassport(
+      "web_socket_proxy", map_);
+  std::string query = std::string("hostname=") +
+      net::EscapeQueryParamValue(hostname_, false) + "&port=" + map_["port"] +
+      "&tls=" + map_["tls"] + "&passport=" +
+      net::EscapeQueryParamValue(passport, false);
+  if (ContainsKey(map_, "addr"))
+    query += std::string("&addr=") + map_["addr"];
+
+  if (listening_port_ < 1)
+    listening_port_ = chromeos::WebSocketProxyController::GetPort();
+  StringValue* url = Value::CreateStringValue(std::string(
+      "ws://127.0.0.1:" + base::IntToString(listening_port_) +
+      "/tcpproxy?" + query));
+  result_.reset(url);
+#endif
+}
+
+bool WebSocketProxyPrivateGetURLForTCPFunction::RunImpl() {
+#if defined(OS_CHROMEOS)
+  DictionaryValue* qualification = NULL;
+  if (args_->GetDictionary(2, &qualification)) {
+    const char kTlsOption[] = "tls";
+    if (qualification->HasKey(kTlsOption)) {
+      EXTENSION_FUNCTION_VALIDATE(qualification->GetBoolean(
+          kTlsOption, &do_tls_));
+    }
+  }
+  map_["tls"] = do_tls_ ? "true" : "false";
+#endif
+
+  return WebSocketProxyPrivate::RunImpl();
+}
+
 WebSocketProxyPrivateGetPassportForTCPFunction::
     WebSocketProxyPrivateGetPassportForTCPFunction() {
   // This obsolete API uses fixed port to listen websocket connections.
   listening_port_ = 10101;
 }
 
-bool WebSocketProxyPrivateGetPassportForTCPFunction::RunImpl() {
-  AddRef();
-  bool delay_response = false;
-  result_.reset(Value::CreateStringValue(""));
-
-#if defined(OS_CHROMEOS)
-  std::string hostname;
-  EXTENSION_FUNCTION_VALIDATE(args_->GetString(0, &hostname));
-  int port = -1;
-  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(1, &port));
-
-  if (chromeos::WebSocketProxyController::CheckCredentials(
-          extension_id(), hostname, port,
-          chromeos::WebSocketProxyController::PLAIN_TCP)) {
-    listening_port_ = chromeos::WebSocketProxyController::GetPort();
-    if (listening_port_ < 1) {
-      delay_response = true;
-      registrar_.Add(
-          this, chrome::NOTIFICATION_WEB_SOCKET_PROXY_STARTED,
-          content::NotificationService::AllSources());
-    }
-
-    std::map<std::string, std::string> map;
-    map["hostname"] = hostname;
-    map["port"] = base::IntToString(port);
-    map["extension_id"] = extension_id();
-    StringValue* passport = Value::CreateStringValue(
-        browser::InternalAuthGeneration::GeneratePassport(
-            "web_socket_proxy", map));
-    result_.reset(passport);
-  } else {
-    error_ = kPermissionDeniedError;
-    return false;
-  }
-#endif  // defined(OS_CHROMEOS)
-
-  if (delay_response) {
-    const int kTimeout = 3;
-    timer_.Start(FROM_HERE, base::TimeDelta::FromSeconds(kTimeout),
-        this, &WebSocketProxyPrivateGetPassportForTCPFunction::Finalize);
-  } else {
-    Finalize();
-  }
-  return true;
+WebSocketProxyPrivateGetPassportForTCPFunction::
+    ~WebSocketProxyPrivateGetPassportForTCPFunction() {
 }
 
+void WebSocketProxyPrivateGetPassportForTCPFunction::CustomFinalize() {
+#if defined(OS_CHROMEOS)
+  std::string passport =
+      browser::InternalAuthGeneration::GeneratePassport(
+          "web_socket_proxy", map_) + std::string(":");
+  if (ContainsKey(map_, "addr"))
+    passport += map_["addr"];
+  result_.reset(Value::CreateStringValue(passport));
+#endif
+}