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      1 // Copyright (c) 2012 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 "cloud_print/service/win/chrome_launcher.h"
      6 
      7 #include "base/base_switches.h"
      8 #include "base/command_line.h"
      9 #include "base/file_util.h"
     10 #include "base/files/scoped_temp_dir.h"
     11 #include "base/json/json_reader.h"
     12 #include "base/json/json_writer.h"
     13 #include "base/process/kill.h"
     14 #include "base/process/process.h"
     15 #include "base/values.h"
     16 #include "base/win/registry.h"
     17 #include "base/win/scoped_handle.h"
     18 #include "base/win/scoped_process_information.h"
     19 #include "chrome/common/chrome_constants.h"
     20 #include "chrome/common/chrome_switches.h"
     21 #include "chrome/common/pref_names.h"
     22 #include "chrome/installer/launcher_support/chrome_launcher_support.h"
     23 #include "cloud_print/common/win/cloud_print_utils.h"
     24 #include "cloud_print/service/service_constants.h"
     25 #include "cloud_print/service/win/service_utils.h"
     26 #include "components/cloud_devices/common/cloud_devices_urls.h"
     27 #include "google_apis/gaia/gaia_urls.h"
     28 #include "net/base/url_util.h"
     29 #include "url/gurl.h"
     30 
     31 namespace {
     32 
     33 const int kShutdownTimeoutMs = 30 * 1000;
     34 const int kUsageUpdateTimeoutMs = 6 * 3600 * 1000;  // 6 hours.
     35 
     36 static const base::char16 kAutoRunKeyPath[] =
     37     L"Software\\Microsoft\\Windows\\CurrentVersion\\Run";
     38 
     39 // Terminates any process.
     40 void ShutdownChrome(HANDLE process, DWORD thread_id) {
     41   if (::PostThreadMessage(thread_id, WM_QUIT, 0, 0) &&
     42       WAIT_OBJECT_0 == ::WaitForSingleObject(process, kShutdownTimeoutMs)) {
     43     return;
     44   }
     45   LOG(ERROR) << "Failed to shutdown process.";
     46   base::KillProcess(process, 0, true);
     47 }
     48 
     49 BOOL CALLBACK CloseIfPidEqual(HWND wnd, LPARAM lparam) {
     50   DWORD pid = 0;
     51   ::GetWindowThreadProcessId(wnd, &pid);
     52   if (pid == static_cast<DWORD>(lparam))
     53     ::PostMessage(wnd, WM_CLOSE, 0, 0);
     54   return TRUE;
     55 }
     56 
     57 void CloseAllProcessWindows(HANDLE process) {
     58   ::EnumWindows(&CloseIfPidEqual, GetProcessId(process));
     59 }
     60 
     61 // Close Chrome browser window.
     62 void CloseChrome(HANDLE process, DWORD thread_id) {
     63   CloseAllProcessWindows(process);
     64   if (WAIT_OBJECT_0 == ::WaitForSingleObject(process, kShutdownTimeoutMs)) {
     65     return;
     66   }
     67   ShutdownChrome(process, thread_id);
     68 }
     69 
     70 bool LaunchProcess(const CommandLine& cmdline,
     71                    base::win::ScopedHandle* process_handle,
     72                    DWORD* thread_id) {
     73   STARTUPINFO startup_info = {};
     74   startup_info.cb = sizeof(startup_info);
     75   startup_info.dwFlags = STARTF_USESHOWWINDOW;
     76   startup_info.wShowWindow = SW_SHOW;
     77 
     78   PROCESS_INFORMATION temp_process_info = {};
     79   if (!CreateProcess(NULL,
     80       const_cast<wchar_t*>(cmdline.GetCommandLineString().c_str()), NULL, NULL,
     81       FALSE, 0, NULL, NULL, &startup_info, &temp_process_info)) {
     82     return false;
     83   }
     84   base::win::ScopedProcessInformation process_info(temp_process_info);
     85 
     86   if (process_handle)
     87     process_handle->Set(process_info.TakeProcessHandle());
     88 
     89   if (thread_id)
     90     *thread_id = process_info.thread_id();
     91 
     92   return true;
     93 }
     94 
     95 std::string ReadAndUpdateServiceState(const base::FilePath& directory,
     96                                       const std::string& proxy_id) {
     97   std::string json;
     98   base::FilePath file_path = directory.Append(chrome::kServiceStateFileName);
     99   if (!base::ReadFileToString(file_path, &json)) {
    100     return std::string();
    101   }
    102 
    103   scoped_ptr<base::Value> service_state(base::JSONReader::Read(json));
    104   base::DictionaryValue* dictionary = NULL;
    105   if (!service_state->GetAsDictionary(&dictionary) || !dictionary) {
    106     return std::string();
    107   }
    108 
    109   bool enabled = false;
    110   if (!dictionary->GetBoolean(prefs::kCloudPrintProxyEnabled, &enabled) ||
    111       !enabled) {
    112     return std::string();
    113   }
    114 
    115   std::string refresh_token;
    116   if (!dictionary->GetString(prefs::kCloudPrintRobotRefreshToken,
    117                              &refresh_token) ||
    118       refresh_token.empty()) {
    119     return std::string();
    120   }
    121 
    122   // Remove everything except kCloudPrintRoot.
    123   scoped_ptr<base::Value> cloud_print_root;
    124   dictionary->Remove(prefs::kCloudPrintRoot, &cloud_print_root);
    125   dictionary->Clear();
    126   dictionary->Set(prefs::kCloudPrintRoot, cloud_print_root.release());
    127 
    128   dictionary->SetBoolean(prefs::kCloudPrintXmppPingEnabled, true);
    129   if (!proxy_id.empty())  // Reuse proxy id if we already had one.
    130     dictionary->SetString(prefs::kCloudPrintProxyId, proxy_id);
    131   std::string result;
    132   base::JSONWriter::WriteWithOptions(dictionary,
    133                                      base::JSONWriter::OPTIONS_PRETTY_PRINT,
    134                                      &result);
    135   return result;
    136 }
    137 
    138 void DeleteAutorunKeys(const base::FilePath& user_data_dir) {
    139   base::win::RegKey key(HKEY_CURRENT_USER, kAutoRunKeyPath, KEY_SET_VALUE);
    140   if (!key.Valid())
    141     return;
    142   std::vector<base::string16> to_delete;
    143 
    144   base::FilePath abs_user_data_dir = base::MakeAbsoluteFilePath(user_data_dir);
    145 
    146   {
    147     base::win::RegistryValueIterator value(HKEY_CURRENT_USER, kAutoRunKeyPath);
    148     for (; value.Valid(); ++value) {
    149       if (value.Type() == REG_SZ && value.Value()) {
    150         CommandLine cmd = CommandLine::FromString(value.Value());
    151         if (cmd.GetSwitchValueASCII(switches::kProcessType) ==
    152             switches::kServiceProcess &&
    153             cmd.HasSwitch(switches::kUserDataDir)) {
    154           base::FilePath path_from_reg = base::MakeAbsoluteFilePath(
    155               cmd.GetSwitchValuePath(switches::kUserDataDir));
    156           if (path_from_reg == abs_user_data_dir) {
    157             to_delete.push_back(value.Name());
    158           }
    159         }
    160       }
    161     }
    162   }
    163 
    164   for (size_t i = 0; i < to_delete.size(); ++i) {
    165     key.DeleteValue(to_delete[i].c_str());
    166   }
    167 }
    168 
    169 }  // namespace
    170 
    171 ChromeLauncher::ChromeLauncher(const base::FilePath& user_data)
    172     : stop_event_(true, true),
    173       user_data_(user_data) {
    174 }
    175 
    176 ChromeLauncher::~ChromeLauncher() {
    177 }
    178 
    179 bool ChromeLauncher::Start() {
    180   DeleteAutorunKeys(user_data_);
    181   stop_event_.Reset();
    182   thread_.reset(new base::DelegateSimpleThread(this, "chrome_launcher"));
    183   thread_->Start();
    184   return true;
    185 }
    186 
    187 void ChromeLauncher::Stop() {
    188   stop_event_.Signal();
    189   thread_->Join();
    190   thread_.reset();
    191 }
    192 
    193 void ChromeLauncher::Run() {
    194   const base::TimeDelta default_time_out = base::TimeDelta::FromSeconds(1);
    195   const base::TimeDelta max_time_out = base::TimeDelta::FromHours(1);
    196 
    197   for (base::TimeDelta time_out = default_time_out;;
    198        time_out = std::min(time_out * 2, max_time_out)) {
    199     base::FilePath chrome_path = chrome_launcher_support::GetAnyChromePath();
    200 
    201     if (!chrome_path.empty()) {
    202       CommandLine cmd(chrome_path);
    203       CopyChromeSwitchesFromCurrentProcess(&cmd);
    204 
    205       // Required switches.
    206       cmd.AppendSwitchASCII(switches::kProcessType, switches::kServiceProcess);
    207       cmd.AppendSwitchPath(switches::kUserDataDir, user_data_);
    208       cmd.AppendSwitch(switches::kNoServiceAutorun);
    209 
    210       // Optional.
    211       cmd.AppendSwitch(switches::kAutoLaunchAtStartup);
    212       cmd.AppendSwitch(switches::kDisableDefaultApps);
    213       cmd.AppendSwitch(switches::kDisableExtensions);
    214       cmd.AppendSwitch(switches::kDisableGpu);
    215       cmd.AppendSwitch(switches::kDisableSoftwareRasterizer);
    216       cmd.AppendSwitch(switches::kDisableSync);
    217       cmd.AppendSwitch(switches::kNoFirstRun);
    218       cmd.AppendSwitch(switches::kNoStartupWindow);
    219 
    220       base::win::ScopedHandle chrome_handle;
    221       base::Time started = base::Time::Now();
    222       DWORD thread_id = 0;
    223       LaunchProcess(cmd, &chrome_handle, &thread_id);
    224 
    225       HANDLE handles[] = {stop_event_.handle(), chrome_handle};
    226       DWORD wait_result = WAIT_TIMEOUT;
    227       while (wait_result == WAIT_TIMEOUT) {
    228         cloud_print::SetGoogleUpdateUsage(kGoogleUpdateId);
    229         wait_result = ::WaitForMultipleObjects(arraysize(handles), handles,
    230                                                FALSE, kUsageUpdateTimeoutMs);
    231       }
    232       if (wait_result == WAIT_OBJECT_0) {
    233         ShutdownChrome(chrome_handle, thread_id);
    234         break;
    235       } else if (wait_result == WAIT_OBJECT_0 + 1) {
    236         LOG(ERROR) << "Chrome process exited.";
    237       } else {
    238         LOG(ERROR) << "Error waiting Chrome (" << ::GetLastError() << ").";
    239       }
    240       if (base::Time::Now() - started > base::TimeDelta::FromHours(1)) {
    241         // Reset timeout because process worked long enough.
    242         time_out = default_time_out;
    243       }
    244     }
    245     if (stop_event_.TimedWait(time_out))
    246       break;
    247   }
    248 }
    249 
    250 std::string ChromeLauncher::CreateServiceStateFile(
    251     const std::string& proxy_id,
    252     const std::vector<std::string>& printers) {
    253   base::ScopedTempDir temp_user_data;
    254   if (!temp_user_data.CreateUniqueTempDir()) {
    255     LOG(ERROR) << "Can't create temp dir.";
    256     return std::string();
    257   }
    258 
    259   base::FilePath chrome_path = chrome_launcher_support::GetAnyChromePath();
    260   if (chrome_path.empty()) {
    261     LOG(ERROR) << "Can't find Chrome.";
    262     return std::string();
    263   }
    264 
    265   base::FilePath printers_file = temp_user_data.path().Append(L"printers.json");
    266 
    267   base::ListValue printer_list;
    268   printer_list.AppendStrings(printers);
    269   std::string printers_json;
    270   base::JSONWriter::Write(&printer_list, &printers_json);
    271   size_t written = base::WriteFile(printers_file,
    272                                    printers_json.c_str(),
    273                                    printers_json.size());
    274   if (written != printers_json.size()) {
    275     LOG(ERROR) << "Can't write file.";
    276     return std::string();
    277   }
    278 
    279   CommandLine cmd(chrome_path);
    280   CopyChromeSwitchesFromCurrentProcess(&cmd);
    281   cmd.AppendSwitchPath(switches::kUserDataDir, temp_user_data.path());
    282   cmd.AppendSwitchPath(switches::kCloudPrintSetupProxy, printers_file);
    283   cmd.AppendSwitch(switches::kNoServiceAutorun);
    284 
    285   // Optional.
    286   cmd.AppendSwitch(switches::kDisableDefaultApps);
    287   cmd.AppendSwitch(switches::kDisableExtensions);
    288   cmd.AppendSwitch(switches::kDisableSync);
    289   cmd.AppendSwitch(switches::kNoDefaultBrowserCheck);
    290   cmd.AppendSwitch(switches::kNoFirstRun);
    291 
    292   cmd.AppendArg(
    293       cloud_devices::GetCloudPrintEnableWithSigninURL(proxy_id).spec());
    294 
    295   base::win::ScopedHandle chrome_handle;
    296   DWORD thread_id = 0;
    297   if (!LaunchProcess(cmd, &chrome_handle, &thread_id)) {
    298     LOG(ERROR) << "Unable to launch Chrome.";
    299     return std::string();
    300   }
    301 
    302   for (;;) {
    303     DWORD wait_result = ::WaitForSingleObject(chrome_handle, 500);
    304     std::string json = ReadAndUpdateServiceState(temp_user_data.path(),
    305                                                  proxy_id);
    306     if (wait_result == WAIT_OBJECT_0) {
    307       // Return what we have because browser is closed.
    308       return json;
    309     }
    310     if (wait_result != WAIT_TIMEOUT) {
    311       LOG(ERROR) << "Chrome launch failed.";
    312       return std::string();
    313     }
    314     if (!json.empty()) {
    315       // Close chrome because Service State is ready.
    316       CloseChrome(chrome_handle, thread_id);
    317       return json;
    318     }
    319   }
    320 }
    321