chrome_frame/chrome_frame_activex.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_frame/chrome_frame_activex.h"
   6
   7 #include <wininet.h>
   8
   9 #include <algorithm>
  10 #include <map>
  11
  12 #include "base/basictypes.h"
  13 #include "base/command_line.h"
  14 #include "base/debug/trace_event.h"
  15 #include "base/file_util.h"
  16 #include "base/logging.h"
  17 #include "base/memory/singleton.h"
  18 #include "base/path_service.h"
  19 #include "base/process_util.h"
  20 #include "base/string_util.h"
  21 #include "base/stringprintf.h"
  22 #include "base/strings/string_split.h"
  23 #include "base/utf_string_conversions.h"
  24 #include "base/win/scoped_bstr.h"
  25 #include "base/win/scoped_variant.h"
  26 #include "chrome/common/automation_messages.h"
  27 #include "chrome/common/chrome_constants.h"
  28 #include "chrome/common/chrome_switches.h"
  29 #include "chrome/test/automation/tab_proxy.h"
  30 #include "chrome_frame/utils.h"
  31 #include "googleurl/src/gurl.h"
  32
  33 namespace {
  34
  35 // Class used to maintain a mapping from top-level windows to ChromeFrameActivex
  36 // instances.
  37 class TopLevelWindowMapping {
  38  public:
  39   typedef std::vector<HWND> WindowList;
  40
  41   static TopLevelWindowMapping* GetInstance() {
  42     return Singleton<TopLevelWindowMapping>::get();
  43   }
  44
  45   // Add |cf_window| to the set of windows registered under |top_window|.
  46   void AddMapping(HWND top_window, HWND cf_window) {
  47     top_window_map_lock_.Lock();
  48     top_window_map_[top_window].push_back(cf_window);
  49     top_window_map_lock_.Unlock();
  50   }
  51
  52   // Return the set of Chrome-Frame instances under |window|.
  53   WindowList GetInstances(HWND window) {
  54     top_window_map_lock_.Lock();
  55     WindowList list = top_window_map_[window];
  56     top_window_map_lock_.Unlock();
  57     return list;
  58   }
  59
  60  private:
  61   // Constructor is private as this class it to be used as a singleton.
  62   // See static method instance().
  63   TopLevelWindowMapping() {}
  64
  65   friend struct DefaultSingletonTraits<TopLevelWindowMapping>;
  66
  67   typedef std::map<HWND, WindowList> TopWindowMap;
  68   TopWindowMap top_window_map_;
  69
  70   CComAutoCriticalSection top_window_map_lock_;
  71
  72   DISALLOW_COPY_AND_ASSIGN(TopLevelWindowMapping);
  73 };
  74
  75 // Message pump hook function that monitors for WM_MOVE and WM_MOVING
  76 // messages on a top-level window, and passes notification to the appropriate
  77 // Chrome-Frame instances.
  78 LRESULT CALLBACK TopWindowProc(int code, WPARAM wparam, LPARAM lparam) {
  79   CWPSTRUCT *info = reinterpret_cast<CWPSTRUCT*>(lparam);
  80   const UINT &message = info->message;
  81   const HWND &message_hwnd = info->hwnd;
  82
  83   switch (message) {
  84     case WM_MOVE:
  85     case WM_MOVING: {
  86       TopLevelWindowMapping::WindowList cf_instances =
  87           TopLevelWindowMapping::GetInstance()->GetInstances(message_hwnd);
  88       TopLevelWindowMapping::WindowList::iterator
  89           iter(cf_instances.begin()), end(cf_instances.end());
  90       for (;iter != end; ++iter) {
  91         PostMessage(*iter, WM_HOST_MOVED_NOTIFICATION, NULL, NULL);
  92       }
  93       break;
  94     }
  95     default:
  96       break;
  97   }
  98
  99   return CallNextHookEx(0, code, wparam, lparam);
 100 }
 101
 102 HHOOK InstallLocalWindowHook(HWND window) {
 103   if (!window)
 104     return NULL;
 105
 106   DWORD proc_thread = ::GetWindowThreadProcessId(window, NULL);
 107   if (!proc_thread)
 108     return NULL;
 109
 110   // Note that this hook is installed as a LOCAL hook.
 111   return  ::SetWindowsHookEx(WH_CALLWNDPROC,
 112                              TopWindowProc,
 113                              NULL,
 114                              proc_thread);
 115 }
 116
 117 }  // unnamed namespace
 118
 119 namespace chrome_frame {
 120 std::string ActiveXCreateUrl(const GURL& parsed_url,
 121                              const AttachExternalTabParams& params) {
 122   return base::StringPrintf(
 123       "%hs?attach_external_tab&%I64u&%d&%d&%d&%d&%d&%hs",
 124       parsed_url.GetOrigin().spec().c_str(),
 125       params.cookie,
 126       params.disposition,
 127       params.dimensions.x(),
 128       params.dimensions.y(),
 129       params.dimensions.width(),
 130       params.dimensions.height(),
 131       params.profile_name.c_str());
 132 }
 133
 134 int GetDisposition(const AttachExternalTabParams& params) {
 135   return params.disposition;
 136 }
 137
 138 void GetMiniContextMenuData(UINT cmd,
 139                             const MiniContextMenuParams& params,
 140                             GURL* referrer,
 141                             GURL* url) {
 142   *referrer = params.frame_url.is_empty() ? params.page_url : params.frame_url;
 143   *url = (cmd == IDS_CONTENT_CONTEXT_SAVELINKAS ?
 144       params.link_url : params.src_url);
 145 }
 146
 147 }  // namespace chrome_frame
 148
 149 ChromeFrameActivex::ChromeFrameActivex()
 150     : chrome_wndproc_hook_(NULL),
 151       attaching_to_existing_cf_tab_(false) {
 152   TRACE_EVENT_BEGIN_ETW("chromeframe.createactivex", this, "");
 153 }
 154
 155 HRESULT ChromeFrameActivex::FinalConstruct() {
 156   HRESULT hr = Base::FinalConstruct();
 157   if (FAILED(hr))
 158     return hr;
 159
 160   // No need to call FireOnChanged at this point since nobody will be listening.
 161   ready_state_ = READYSTATE_LOADING;
 162   return S_OK;
 163 }
 164
 165 ChromeFrameActivex::~ChromeFrameActivex() {
 166   // We expect these to be released during a call to SetClientSite(NULL).
 167   DCHECK_EQ(0u, onmessage_.size());
 168   DCHECK_EQ(0u, onloaderror_.size());
 169   DCHECK_EQ(0u, onload_.size());
 170   DCHECK_EQ(0u, onreadystatechanged_.size());
 171   DCHECK_EQ(0u, onextensionready_.size());
 172
 173   if (chrome_wndproc_hook_) {
 174     BOOL unhook_success = ::UnhookWindowsHookEx(chrome_wndproc_hook_);
 175     DCHECK(unhook_success);
 176   }
 177
 178   // ChromeFramePlugin::Uninitialize()
 179   Base::Uninitialize();
 180
 181   TRACE_EVENT_END_ETW("chromeframe.createactivex", this, "");
 182 }
 183
 184 LRESULT ChromeFrameActivex::OnCreate(UINT message, WPARAM wparam, LPARAM lparam,
 185                                      BOOL& handled) {
 186   Base::OnCreate(message, wparam, lparam, handled);
 187   // Install the notification hook on the top-level window, so that we can
 188   // be notified on move events.  Note that the return value is not checked.
 189   // This hook is installed here, as opposed to during IOleObject_SetClientSite
 190   // because m_hWnd has not yet been assigned during the SetSite call.
 191   InstallTopLevelHook(m_spClientSite);
 192   return 0;
 193 }
 194
 195 LRESULT ChromeFrameActivex::OnHostMoved(UINT message, WPARAM wparam,
 196                                         LPARAM lparam, BOOL& handled) {
 197   Base::OnHostMoved();
 198   return 0;
 199 }
 200
 201 HRESULT ChromeFrameActivex::GetContainingDocument(IHTMLDocument2** doc) {
 202   base::win::ScopedComPtr<IOleContainer> container;
 203   HRESULT hr = m_spClientSite->GetContainer(container.Receive());
 204   if (container)
 205     hr = container.QueryInterface(doc);
 206   return hr;
 207 }
 208
 209 HRESULT ChromeFrameActivex::GetDocumentWindow(IHTMLWindow2** window) {
 210   base::win::ScopedComPtr<IHTMLDocument2> document;
 211   HRESULT hr = GetContainingDocument(document.Receive());
 212   if (document)
 213     hr = document->get_parentWindow(window);
 214   return hr;
 215 }
 216
 217 void ChromeFrameActivex::OnLoad(const GURL& gurl) {
 218   base::win::ScopedComPtr<IDispatch> event;
 219   std::string url = gurl.spec();
 220   if (SUCCEEDED(CreateDomEvent("event", url, "", event.Receive())))
 221     Fire_onload(event);
 222
 223   FireEvent(onload_, url);
 224   Base::OnLoad(gurl);
 225 }
 226
 227 void ChromeFrameActivex::OnLoadFailed(int error_code, const std::string& url) {
 228   base::win::ScopedComPtr<IDispatch> event;
 229   if (SUCCEEDED(CreateDomEvent("event", url, "", event.Receive())))
 230     Fire_onloaderror(event);
 231
 232   FireEvent(onloaderror_, url);
 233   Base::OnLoadFailed(error_code, url);
 234 }
 235
 236 void ChromeFrameActivex::OnMessageFromChromeFrame(const std::string& message,
 237                                                   const std::string& origin,
 238                                                   const std::string& target) {
 239   DVLOG(1) << __FUNCTION__;
 240
 241   if (target.compare("*") != 0) {
 242     bool drop = true;
 243
 244     if (is_privileged()) {
 245       // Forward messages if the control is in privileged mode.
 246       base::win::ScopedComPtr<IDispatch> message_event;
 247       if (SUCCEEDED(CreateDomEvent("message", message, origin,
 248                                    message_event.Receive()))) {
 249         base::win::ScopedBstr target_bstr(UTF8ToWide(target).c_str());
 250         Fire_onprivatemessage(message_event, target_bstr);
 251
 252         FireEvent(onprivatemessage_, message_event, target_bstr);
 253       }
 254     } else {
 255       if (HaveSameOrigin(target, document_url_)) {
 256         drop = false;
 257       } else {
 258         DLOG(WARNING) << "Dropping posted message since target doesn't match "
 259             "the current document's origin. target=" << target;
 260       }
 261     }
 262
 263     if (drop)
 264       return;
 265   }
 266
 267   base::win::ScopedComPtr<IDispatch> message_event;
 268   if (SUCCEEDED(CreateDomEvent("message", message, origin,
 269                                message_event.Receive()))) {
 270     Fire_onmessage(message_event);
 271
 272     FireEvent(onmessage_, message_event);
 273
 274     base::win::ScopedVariant event_var;
 275     event_var.Set(static_cast<IDispatch*>(message_event));
 276     InvokeScriptFunction(onmessage_handler_, event_var.AsInput());
 277   }
 278 }
 279
 280 bool ChromeFrameActivex::ShouldShowVersionMismatchDialog(
 281     bool is_privileged,
 282     IOleClientSite* client_site) {
 283   if (!is_privileged) {
 284     return true;
 285   }
 286
 287   if (client_site) {
 288     base::win::ScopedComPtr<IChromeFramePrivileged> service;
 289     HRESULT hr = DoQueryService(SID_ChromeFramePrivileged,
 290                                 client_site,
 291                                 service.Receive());
 292     if (SUCCEEDED(hr) && service) {
 293       return (S_FALSE != service->ShouldShowVersionMismatchDialog());
 294     }
 295   }
 296
 297   NOTREACHED();
 298   return true;
 299 }
 300
 301 void ChromeFrameActivex::OnAutomationServerLaunchFailed(
 302     AutomationLaunchResult reason, const std::string& server_version) {
 303   Base::OnAutomationServerLaunchFailed(reason, server_version);
 304
 305   if (reason == AUTOMATION_VERSION_MISMATCH &&
 306       ShouldShowVersionMismatchDialog(is_privileged(), m_spClientSite)) {
 307     UMA_HISTOGRAM_COUNTS("ChromeFrame.VersionMismatchDisplayed", 1);
 308     DisplayVersionMismatchWarning(m_hWnd, server_version);
 309   }
 310 }
 311
 312 void ChromeFrameActivex::OnChannelError() {
 313   Fire_onchannelerror();
 314 }
 315
 316 HRESULT ChromeFrameActivex::OnDraw(ATL_DRAWINFO& draw_info) {  // NOLINT
 317   HRESULT hr = S_OK;
 318   int dc_type = ::GetObjectType(draw_info.hicTargetDev);
 319   if (dc_type == OBJ_ENHMETADC) {
 320     RECT print_bounds = {0};
 321     print_bounds.left = draw_info.prcBounds->left;
 322     print_bounds.right = draw_info.prcBounds->right;
 323     print_bounds.top = draw_info.prcBounds->top;
 324     print_bounds.bottom = draw_info.prcBounds->bottom;
 325
 326     automation_client_->Print(draw_info.hdcDraw, print_bounds);
 327   } else {
 328     hr = Base::OnDraw(draw_info);
 329   }
 330
 331   return hr;
 332 }
 333
 334 STDMETHODIMP ChromeFrameActivex::Load(IPropertyBag* bag, IErrorLog* error_log) {
 335   DCHECK(bag);
 336
 337   const wchar_t* event_props[] = {
 338     (L"onload"),
 339     (L"onloaderror"),
 340     (L"onmessage"),
 341     (L"onreadystatechanged"),
 342   };
 343
 344   base::win::ScopedComPtr<IHTMLObjectElement> obj_element;
 345   GetObjectElement(obj_element.Receive());
 346
 347   base::win::ScopedBstr object_id;
 348   GetObjectScriptId(obj_element, object_id.Receive());
 349
 350   base::win::ScopedComPtr<IHTMLElement2> element;
 351   element.QueryFrom(obj_element);
 352   HRESULT hr = S_OK;
 353
 354   for (int i = 0; SUCCEEDED(hr) && i < arraysize(event_props); ++i) {
 355     base::win::ScopedBstr prop(event_props[i]);
 356     base::win::ScopedVariant value;
 357     if (SUCCEEDED(bag->Read(prop, value.Receive(), error_log))) {
 358       if (value.type() != VT_BSTR ||
 359           FAILED(hr = CreateScriptBlockForEvent(element, object_id,
 360                                                 V_BSTR(&value), prop))) {
 361         DLOG(ERROR) << "Failed to create script block for " << prop
 362                     << base::StringPrintf(L"hr=0x%08X, vt=%i", hr,
 363                                          value.type());
 364       } else {
 365         DVLOG(1) << "script block created for event " << prop
 366                  << base::StringPrintf(" (0x%08X)", hr) << " connections: " <<
 367             ProxyDIChromeFrameEvents<ChromeFrameActivex>::m_vec.GetSize();
 368       }
 369     } else {
 370       DVLOG(1) << "event property " << prop << " not in property bag";
 371     }
 372   }
 373
 374   base::win::ScopedVariant src;
 375   if (SUCCEEDED(bag->Read(base::win::ScopedBstr(L"src"), src.Receive(),
 376                           error_log))) {
 377     if (src.type() == VT_BSTR) {
 378       hr = put_src(V_BSTR(&src));
 379       DCHECK(hr != E_UNEXPECTED);
 380     }
 381   }
 382
 383   base::win::ScopedVariant use_chrome_network;
 384   if (SUCCEEDED(bag->Read(base::win::ScopedBstr(L"useChromeNetwork"),
 385                           use_chrome_network.Receive(), error_log))) {
 386     VariantChangeType(use_chrome_network.AsInput(),
 387                       use_chrome_network.AsInput(),
 388                       0, VT_BOOL);
 389     if (use_chrome_network.type() == VT_BOOL) {
 390       hr = put_useChromeNetwork(V_BOOL(&use_chrome_network));
 391       DCHECK(hr != E_UNEXPECTED);
 392     }
 393   }
 394
 395   DLOG_IF(ERROR, FAILED(hr))
 396       << base::StringPrintf("Failed to load property bag: 0x%08X", hr);
 397
 398   return hr;
 399 }
 400
 401 const wchar_t g_activex_insecure_content_error[] = {
 402     L"data:text/html,<html><body><b>ChromeFrame Security Error<br><br>"
 403     L"Cannot navigate to HTTP url when document URL is HTTPS</body></html>"};
 404
 405 STDMETHODIMP ChromeFrameActivex::put_src(BSTR src) {
 406   GURL document_url(GetDocumentUrl());
 407   if (document_url.SchemeIsSecure()) {
 408     GURL source_url(src);
 409     if (!source_url.SchemeIsSecure()) {
 410       Base::put_src(base::win::ScopedBstr(g_activex_insecure_content_error));
 411       return E_ACCESSDENIED;
 412     }
 413   }
 414   HRESULT hr = S_OK;
 415   // If we are connecting to an existing ExternalTabContainer instance in
 416   // Chrome then we should wait for Chrome to initiate the navigation.
 417   if (!attaching_to_existing_cf_tab_) {
 418     hr = Base::put_src(src);
 419   } else {
 420     url_.Reset(::SysAllocString(src));
 421     attaching_to_existing_cf_tab_ = false;
 422   }
 423   return S_OK;
 424 }
 425
 426 HRESULT ChromeFrameActivex::IOleObject_SetClientSite(
 427     IOleClientSite* client_site) {
 428   HRESULT hr = Base::IOleObject_SetClientSite(client_site);
 429   if (FAILED(hr) || !client_site) {
 430     EventHandlers* handlers[] = {
 431       &onmessage_,
 432       &onloaderror_,
 433       &onload_,
 434       &onreadystatechanged_,
 435       &onextensionready_,
 436     };
 437
 438     for (int i = 0; i < arraysize(handlers); ++i)
 439       handlers[i]->clear();
 440
 441     // Drop privileged mode on uninitialization.
 442     set_is_privileged(false);
 443   } else {
 444     base::win::ScopedComPtr<IHTMLDocument2> document;
 445     GetContainingDocument(document.Receive());
 446     if (document) {
 447       base::win::ScopedBstr url;
 448       if (SUCCEEDED(document->get_URL(url.Receive())))
 449         WideToUTF8(url, url.Length(), &document_url_);
 450     }
 451
 452     // Probe to see whether the host implements the privileged service.
 453     base::win::ScopedComPtr<IChromeFramePrivileged> service;
 454     HRESULT service_hr = DoQueryService(SID_ChromeFramePrivileged,
 455                                         m_spClientSite,
 456                                         service.Receive());
 457     if (SUCCEEDED(service_hr) && service) {
 458       // Does the host want privileged mode?
 459       boolean wants_privileged = false;
 460       service_hr = service->GetWantsPrivileged(&wants_privileged);
 461
 462       if (SUCCEEDED(service_hr) && wants_privileged)
 463         set_is_privileged(true);
 464
 465       url_fetcher_->set_privileged_mode(is_privileged());
 466     }
 467
 468     std::wstring profile_name(GetHostProcessName(false));
 469     if (is_privileged()) {
 470       base::win::ScopedBstr profile_name_arg;
 471       service_hr = service->GetChromeProfileName(profile_name_arg.Receive());
 472       if (S_OK == service_hr && profile_name_arg)
 473         profile_name.assign(profile_name_arg, profile_name_arg.Length());
 474     }
 475
 476     std::string utf8_url;
 477     if (url_.Length()) {
 478       WideToUTF8(url_, url_.Length(), &utf8_url);
 479     }
 480
 481     InitializeAutomationSettings();
 482
 483     if (service) {
 484       base::win::ScopedBstr navigation_url;
 485       service->GetNavigationUrl(navigation_url.Receive());
 486       if (navigation_url.Length()) {
 487         ChromeFrameUrl cf_url;
 488         cf_url.Parse(navigation_url.operator BSTR());
 489         if (cf_url.attach_to_external_tab()) {
 490           automation_client_->AttachExternalTab(cf_url.cookie());
 491           attaching_to_existing_cf_tab_ = true;
 492         }
 493       }
 494     }
 495     url_fetcher_->set_frame_busting(!is_privileged());
 496     automation_client_->SetUrlFetcher(url_fetcher_.get());
 497     if (!InitializeAutomation(profile_name, IsIEInPrivate(), true,
 498                               GURL(utf8_url), GURL(), false)) {
 499       DLOG(ERROR) << "Failed to navigate to url:" << utf8_url;
 500       return E_FAIL;
 501     }
 502
 503     // Log a metric that Chrome Frame is being used in Widget mode
 504     UMA_LAUNCH_TYPE_COUNT(RENDERER_TYPE_CHROME_WIDGET);
 505   }
 506
 507   return hr;
 508 }
 509
 510 HRESULT ChromeFrameActivex::GetObjectScriptId(IHTMLObjectElement* object_elem,
 511                                               BSTR* id) {
 512   DCHECK(object_elem != NULL);
 513   DCHECK(id != NULL);
 514
 515   HRESULT hr = E_FAIL;
 516   if (object_elem) {
 517     base::win::ScopedComPtr<IHTMLElement> elem;
 518     hr = elem.QueryFrom(object_elem);
 519     if (elem) {
 520       hr = elem->get_id(id);
 521     }
 522   }
 523
 524   return hr;
 525 }
 526
 527 HRESULT ChromeFrameActivex::GetObjectElement(IHTMLObjectElement** element) {
 528   DCHECK(m_spClientSite);
 529   if (!m_spClientSite)
 530     return E_UNEXPECTED;
 531
 532   base::win::ScopedComPtr<IOleControlSite> site;
 533   HRESULT hr = site.QueryFrom(m_spClientSite);
 534   if (site) {
 535     base::win::ScopedComPtr<IDispatch> disp;
 536     hr = site->GetExtendedControl(disp.Receive());
 537     if (disp) {
 538       hr = disp.QueryInterface(element);
 539     } else {
 540       DCHECK(FAILED(hr));
 541     }
 542   }
 543
 544   return hr;
 545 }
 546
 547 HRESULT ChromeFrameActivex::CreateScriptBlockForEvent(
 548     IHTMLElement2* insert_after, BSTR instance_id, BSTR script,
 549     BSTR event_name) {
 550   DCHECK(insert_after);
 551   DCHECK_GT(::SysStringLen(event_name), 0UL);  // should always have this
 552
 553   // This might be 0 if not specified in the HTML document.
 554   if (!::SysStringLen(instance_id)) {
 555     // TODO(tommi): Should we give ourselves an ID if this happens?
 556     NOTREACHED() << "Need to handle this";
 557     return E_INVALIDARG;
 558   }
 559
 560   base::win::ScopedComPtr<IHTMLDocument2> document;
 561   HRESULT hr = GetContainingDocument(document.Receive());
 562   if (SUCCEEDED(hr)) {
 563     base::win::ScopedComPtr<IHTMLElement> element, new_element;
 564     document->createElement(base::win::ScopedBstr(L"script"),
 565                             element.Receive());
 566     if (element) {
 567       base::win::ScopedComPtr<IHTMLScriptElement> script_element;
 568       if (SUCCEEDED(hr = script_element.QueryFrom(element))) {
 569         script_element->put_htmlFor(instance_id);
 570         script_element->put_event(event_name);
 571         script_element->put_text(script);
 572
 573         hr = insert_after->insertAdjacentElement(
 574             base::win::ScopedBstr(L"afterEnd"),
 575             element,
 576             new_element.Receive());
 577       }
 578     }
 579   }
 580
 581   return hr;
 582 }
 583
 584 void ChromeFrameActivex::FireEvent(const EventHandlers& handlers,
 585                                    const std::string& arg) {
 586   if (handlers.size()) {
 587     base::win::ScopedComPtr<IDispatch> event;
 588     if (SUCCEEDED(CreateDomEvent("event", arg, "", event.Receive()))) {
 589       FireEvent(handlers, event);
 590     }
 591   }
 592 }
 593
 594 void ChromeFrameActivex::FireEvent(const EventHandlers& handlers,
 595                                    IDispatch* event) {
 596   DCHECK(event != NULL);
 597   VARIANT arg = { VT_DISPATCH };
 598   arg.pdispVal = event;
 599   DISPPARAMS params = { &arg, NULL, 1, 0 };
 600   for (EventHandlers::const_iterator it = handlers.begin();
 601        it != handlers.end();
 602        ++it) {
 603     HRESULT hr = (*it)->Invoke(DISPID_VALUE, IID_NULL, LOCALE_USER_DEFAULT,
 604                                DISPATCH_METHOD, &params, NULL, NULL, NULL);
 605     // 0x80020101 == SCRIPT_E_REPORTED.
 606     // When the script we're invoking has an error, we get this error back.
 607     DLOG_IF(ERROR, FAILED(hr) && hr != 0x80020101)
 608         << base::StringPrintf(L"Failed to invoke script: 0x%08X", hr);
 609   }
 610 }
 611
 612 void ChromeFrameActivex::FireEvent(const EventHandlers& handlers,
 613                                    IDispatch* event, BSTR target) {
 614   DCHECK(event != NULL);
 615   // Arguments in reverse order to event handler function declaration,
 616   // because that's what DISPPARAMS requires.
 617   VARIANT args[2] = { { VT_BSTR }, { VT_DISPATCH }, };
 618   args[0].bstrVal = target;
 619   args[1].pdispVal = event;
 620   DISPPARAMS params = { args, NULL, arraysize(args), 0 };
 621   for (EventHandlers::const_iterator it = handlers.begin();
 622        it != handlers.end();
 623        ++it) {
 624     HRESULT hr = (*it)->Invoke(DISPID_VALUE, IID_NULL, LOCALE_USER_DEFAULT,
 625                                DISPATCH_METHOD, &params, NULL, NULL, NULL);
 626     // 0x80020101 == SCRIPT_E_REPORTED.
 627     // When the script we're invoking has an error, we get this error back.
 628     DLOG_IF(ERROR, FAILED(hr) && hr != 0x80020101)
 629         << base::StringPrintf(L"Failed to invoke script: 0x%08X", hr);
 630   }
 631 }
 632
 633 HRESULT ChromeFrameActivex::InstallTopLevelHook(IOleClientSite* client_site) {
 634   // Get the parent window of the site, and install our hook on the topmost
 635   // window of the parent.
 636   base::win::ScopedComPtr<IOleWindow> ole_window;
 637   HRESULT hr = ole_window.QueryFrom(client_site);
 638   if (FAILED(hr))
 639     return hr;
 640
 641   HWND parent_wnd;
 642   hr = ole_window->GetWindow(&parent_wnd);
 643   if (FAILED(hr))
 644     return hr;
 645
 646   HWND top_window = ::GetAncestor(parent_wnd, GA_ROOT);
 647   chrome_wndproc_hook_ = InstallLocalWindowHook(top_window);
 648   if (chrome_wndproc_hook_)
 649     TopLevelWindowMapping::GetInstance()->AddMapping(top_window, m_hWnd);
 650
 651   return chrome_wndproc_hook_ ? S_OK : E_FAIL;
 652 }
 653
 654 HRESULT ChromeFrameActivex::registerBhoIfNeeded() {
 655   if (!m_spUnkSite) {
 656     NOTREACHED() << "Invalid client site";
 657     return E_FAIL;
 658   }
 659
 660   if (NavigationManager::GetThreadInstance() != NULL) {
 661     DVLOG(1) << "BHO already loaded";
 662     return S_OK;
 663   }
 664
 665   base::win::ScopedComPtr<IWebBrowser2> web_browser2;
 666   HRESULT hr = DoQueryService(SID_SWebBrowserApp, m_spUnkSite,
 667                               web_browser2.Receive());
 668   if (FAILED(hr) || web_browser2.get() == NULL) {
 669     DLOG(WARNING) << "Failed to get IWebBrowser2 from client site. Error:"
 670                   << base::StringPrintf(" 0x%08X", hr);
 671     return hr;
 672   }
 673
 674   wchar_t bho_class_id_as_string[MAX_PATH] = {0};
 675   StringFromGUID2(CLSID_ChromeFrameBHO, bho_class_id_as_string,
 676                   arraysize(bho_class_id_as_string));
 677
 678   base::win::ScopedComPtr<IObjectWithSite> bho;
 679   hr = bho.CreateInstance(CLSID_ChromeFrameBHO, NULL, CLSCTX_INPROC_SERVER);
 680   if (FAILED(hr)) {
 681     NOTREACHED() << "Failed to register ChromeFrame BHO. Error:"
 682                  << base::StringPrintf(" 0x%08X", hr);
 683     return hr;
 684   }
 685
 686   hr = UrlMkSetSessionOption(URLMON_OPTION_USERAGENT_REFRESH, NULL, 0, 0);
 687   if (FAILED(hr)) {
 688     DLOG(ERROR) << "Failed to refresh user agent string from registry. "
 689                 << "UrlMkSetSessionOption returned "
 690                 << base::StringPrintf("0x%08x", hr);
 691     return hr;
 692   }
 693
 694   hr = bho->SetSite(web_browser2);
 695   if (FAILED(hr)) {
 696     NOTREACHED() << "ChromeFrame BHO SetSite failed. Error:"
 697                  << base::StringPrintf(" 0x%08X", hr);
 698     return hr;
 699   }
 700
 701   web_browser2->PutProperty(base::win::ScopedBstr(bho_class_id_as_string),
 702                             base::win::ScopedVariant(bho));
 703   return S_OK;
 704 }