chrome/browser/intranet_redirect_detector.cc

   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 "chrome/browser/intranet_redirect_detector.h"
   6
   7 #include "base/bind.h"
   8 #include "base/command_line.h"
   9 #include "base/location.h"
  10 #include "base/prefs/pref_registry_simple.h"
  11 #include "base/prefs/pref_service.h"
  12 #include "base/rand_util.h"
  13 #include "base/single_thread_task_runner.h"
  14 #include "base/stl_util.h"
  15 #include "base/strings/utf_string_conversions.h"
  16 #include "base/thread_task_runner_handle.h"
  17 #include "chrome/browser/browser_process.h"
  18 #include "chrome/common/chrome_switches.h"
  19 #include "chrome/common/pref_names.h"
  20 #include "net/base/load_flags.h"
  21 #include "net/base/net_errors.h"
  22 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
  23 #include "net/url_request/url_fetcher.h"
  24 #include "net/url_request/url_request_context_getter.h"
  25 #include "net/url_request/url_request_status.h"
  26
  27 IntranetRedirectDetector::IntranetRedirectDetector()
  28     : redirect_origin_(g_browser_process->local_state()->GetString(
  29           prefs::kLastKnownIntranetRedirectOrigin)),
  30       in_sleep_(true),
  31       weak_ptr_factory_(this) {
  32   // Because this function can be called during startup, when kicking off a URL
  33   // fetch can eat up 20 ms of time, we delay seven seconds, which is hopefully
  34   // long enough to be after startup, but still get results back quickly.
  35   // Ideally, instead of this timer, we'd do something like "check if the
  36   // browser is starting up, and if so, come back later", but there is currently
  37   // no function to do this.
  38   static const int kStartFetchDelaySeconds = 7;
  39   base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
  40       FROM_HERE, base::Bind(&IntranetRedirectDetector::FinishSleep,
  41                             weak_ptr_factory_.GetWeakPtr()),
  42       base::TimeDelta::FromSeconds(kStartFetchDelaySeconds));
  43
  44   net::NetworkChangeNotifier::AddIPAddressObserver(this);
  45 }
  46
  47 IntranetRedirectDetector::~IntranetRedirectDetector() {
  48   net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
  49   STLDeleteElements(&fetchers_);
  50 }
  51
  52 // static
  53 GURL IntranetRedirectDetector::RedirectOrigin() {
  54   const IntranetRedirectDetector* const detector =
  55       g_browser_process->intranet_redirect_detector();
  56   return detector ? detector->redirect_origin_ : GURL();
  57 }
  58
  59 // static
  60 void IntranetRedirectDetector::RegisterPrefs(PrefRegistrySimple* registry) {
  61   registry->RegisterStringPref(prefs::kLastKnownIntranetRedirectOrigin,
  62                                std::string());
  63 }
  64
  65 void IntranetRedirectDetector::FinishSleep() {
  66   in_sleep_ = false;
  67
  68   // If another fetch operation is still running, cancel it.
  69   STLDeleteElements(&fetchers_);
  70   resulting_origins_.clear();
  71
  72   const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
  73   if (cmd_line->HasSwitch(switches::kDisableBackgroundNetworking))
  74     return;
  75
  76   DCHECK(fetchers_.empty() && resulting_origins_.empty());
  77
  78   // Start three fetchers on random hostnames.
  79   for (size_t i = 0; i < 3; ++i) {
  80     std::string url_string("http://");
  81     // We generate a random hostname with between 7 and 15 characters.
  82     const int num_chars = base::RandInt(7, 15);
  83     for (int j = 0; j < num_chars; ++j)
  84       url_string += ('a' + base::RandInt(0, 'z' - 'a'));
  85     GURL random_url(url_string + '/');
  86     net::URLFetcher* fetcher =
  87         net::URLFetcher::Create(random_url, net::URLFetcher::HEAD, this)
  88             .release();
  89     // We don't want these fetches to affect existing state in the profile.
  90     fetcher->SetLoadFlags(net::LOAD_DISABLE_CACHE |
  91                           net::LOAD_DO_NOT_SAVE_COOKIES |
  92                           net::LOAD_DO_NOT_SEND_COOKIES);
  93     fetcher->SetRequestContext(g_browser_process->system_request_context());
  94     fetcher->Start();
  95     fetchers_.insert(fetcher);
  96   }
  97 }
  98
  99 void IntranetRedirectDetector::OnURLFetchComplete(
 100     const net::URLFetcher* source) {
 101   // Delete the fetcher on this function's exit.
 102   Fetchers::iterator fetcher = fetchers_.find(
 103       const_cast<net::URLFetcher*>(source));
 104   DCHECK(fetcher != fetchers_.end());
 105   scoped_ptr<net::URLFetcher> clean_up_fetcher(*fetcher);
 106   fetchers_.erase(fetcher);
 107
 108   // If any two fetches result in the same domain/host, we set the redirect
 109   // origin to that; otherwise we set it to nothing.
 110   if (!source->GetStatus().is_success() || (source->GetResponseCode() != 200)) {
 111     if ((resulting_origins_.empty()) ||
 112         ((resulting_origins_.size() == 1) &&
 113          resulting_origins_.front().is_valid())) {
 114       resulting_origins_.push_back(GURL());
 115       return;
 116     }
 117     redirect_origin_ = GURL();
 118   } else {
 119     DCHECK(source->GetURL().is_valid());
 120     GURL origin(source->GetURL().GetOrigin());
 121     if (resulting_origins_.empty()) {
 122       resulting_origins_.push_back(origin);
 123       return;
 124     }
 125     if (net::registry_controlled_domains::SameDomainOrHost(
 126         resulting_origins_.front(),
 127         origin,
 128         net::registry_controlled_domains::EXCLUDE_PRIVATE_REGISTRIES)) {
 129       redirect_origin_ = origin;
 130       if (!fetchers_.empty()) {
 131         // Cancel remaining fetch, we don't need it.
 132         DCHECK(fetchers_.size() == 1);
 133         delete (*fetchers_.begin());
 134         fetchers_.clear();
 135       }
 136     }
 137     if (resulting_origins_.size() == 1) {
 138       resulting_origins_.push_back(origin);
 139       return;
 140     }
 141     DCHECK(resulting_origins_.size() == 2);
 142     const bool same_domain_or_host =
 143         net::registry_controlled_domains::SameDomainOrHost(
 144             resulting_origins_.back(),
 145             origin,
 146             net::registry_controlled_domains::EXCLUDE_PRIVATE_REGISTRIES);
 147     redirect_origin_ = same_domain_or_host ? origin : GURL();
 148   }
 149
 150   g_browser_process->local_state()->SetString(
 151       prefs::kLastKnownIntranetRedirectOrigin, redirect_origin_.is_valid() ?
 152           redirect_origin_.spec() : std::string());
 153 }
 154
 155 void IntranetRedirectDetector::OnIPAddressChanged() {
 156   // If a request is already scheduled, do not scheduled yet another one.
 157   if (in_sleep_)
 158     return;
 159
 160   // Since presumably many programs open connections after network changes,
 161   // delay this a little bit.
 162   in_sleep_ = true;
 163   static const int kNetworkSwitchDelayMS = 1000;
 164   base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
 165       FROM_HERE, base::Bind(&IntranetRedirectDetector::FinishSleep,
 166                             weak_ptr_factory_.GetWeakPtr()),
 167       base::TimeDelta::FromMilliseconds(kNetworkSwitchDelayMS));
 168 }