Initial import of the Chrome Frame codebase. Integration in chrome.gyp coming...

chrome_frame/bho.cc

Index: chrome_frame/bho.cc
===================================================================
--- chrome_frame/bho.cc	(revision 0)
+++ chrome_frame/bho.cc	(revision 0)
@@ -0,0 +1,247 @@
+// Copyright (c) 2009 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_frame/bho.h"
+
+#include <shlguid.h>
+#include <shobjidl.h>
+
+#include "base/logging.h"
+#include "base/registry.h"
+#include "base/scoped_bstr_win.h"
+#include "base/scoped_comptr_win.h"
+#include "base/scoped_variant_win.h"
+#include "base/string_util.h"
+#include "chrome_tab.h" // NOLINT
+#include "chrome_frame/protocol_sink_wrap.h"
+#include "chrome_frame/utils.h"
+#include "chrome_frame/vtable_patch_manager.h"
+
+const wchar_t kUrlMonDllName[] = L"urlmon.dll";
+const wchar_t kPatchProtocols[] = L"PatchProtocols";
+static const int kIBrowserServiceOnHttpEquivIndex = 30;
+
+PatchHelper g_patch_helper;
+
+BEGIN_VTABLE_PATCHES(IBrowserService)
+  VTABLE_PATCH_ENTRY(kIBrowserServiceOnHttpEquivIndex, Bho::OnHttpEquiv)
+END_VTABLE_PATCHES()
+
+_ATL_FUNC_INFO Bho::kBeforeNavigate2Info = {
+  CC_STDCALL, VT_EMPTY, 7, {
+    VT_DISPATCH,
+    VT_VARIANT | VT_BYREF,
+    VT_VARIANT | VT_BYREF,
+    VT_VARIANT | VT_BYREF,
+    VT_VARIANT | VT_BYREF,
+    VT_VARIANT | VT_BYREF,
+    VT_BOOL | VT_BYREF
+  }
+};
+
+Bho::Bho() {
+}
+
+STDMETHODIMP Bho::SetSite(IUnknown* site) {
+  HRESULT hr = S_OK;
+  if (site) {
+    ScopedComPtr<IWebBrowser2> web_browser2;
+    web_browser2.QueryFrom(site);
+    if (web_browser2) {
+      hr = DispEventAdvise(web_browser2, &DIID_DWebBrowserEvents2);
+      DCHECK(SUCCEEDED(hr)) << "DispEventAdvise failed. Error: " << hr;
+    }
+
+    if (g_patch_helper.state() == PatchHelper::PATCH_IBROWSER) {
+      ScopedComPtr<IBrowserService> browser_service;
+      hr = DoQueryService(SID_SShellBrowser, site, browser_service.Receive());
+      DCHECK(browser_service) << "DoQueryService - SID_SShellBrowser failed."
+        << " Site: " << site << " Error: " << hr;
+      if (browser_service) {
+        g_patch_helper.PatchBrowserService(browser_service);
+        DCHECK(SUCCEEDED(hr)) << "vtable_patch::PatchInterfaceMethods failed."
+            << " Site: " << site << " Error: " << hr;
+      }
+    }
+  }
+
+  return IObjectWithSiteImpl<Bho>::SetSite(site);
+}
+
+STDMETHODIMP Bho::BeforeNavigate2(IDispatch* dispatch, VARIANT* url,
+    VARIANT* flags, VARIANT* target_frame_name, VARIANT* post_data,
+    VARIANT* headers, VARIANT_BOOL* cancel) {
+  ScopedComPtr<IWebBrowser2> web_browser2;
+  if (dispatch)
+    web_browser2.QueryFrom(dispatch);
+
+  if (!web_browser2) {
+    NOTREACHED() << "Can't find WebBrowser2 with given dispatch";
+    return S_OK;  // Return success, we operate on best effort basis.
+  }
+
+  DLOG(INFO) << "BeforeNavigate2: " << url->bstrVal;
+
+  if (g_patch_helper.state() == PatchHelper::PATCH_IBROWSER) {
+    VARIANT_BOOL is_top_level = VARIANT_FALSE;
+    web_browser2->get_TopLevelContainer(&is_top_level);
+
+    std::wstring current_url;
+    bool is_chrome_protocol = false;
+    if (is_top_level && IsValidUrlScheme(url->bstrVal)) {
+      current_url.assign(url->bstrVal, SysStringLen(url->bstrVal));
+      is_chrome_protocol = StartsWith(current_url, kChromeProtocolPrefix,
+                                      false);
+
+      if (!is_chrome_protocol && IsOptInUrl(current_url.c_str())) {
+        DLOG(INFO) << "Canceling navigation and switching to cf";
+        // Cancel original navigation
+        *cancel = VARIANT_TRUE;
+
+        // Issue new request with 'cf:'
+        current_url.insert(0, kChromeProtocolPrefix);
+        ScopedVariant new_url(current_url.c_str());
+        HRESULT hr = web_browser2->Navigate2(new_url.AsInput(), flags,
+                                             target_frame_name, post_data,
+                                             headers);
+        DCHECK(SUCCEEDED(hr)) << "web_browser2->Navigate2 failed. Error: " << hr
+            << std::endl << "Url: " << current_url
+            << std::endl << "flags: " << flags
+            << std::endl << "post data: " << post_data
+            << std::endl << "headers: " << headers;
+      }
+    }
+  }
+  return S_OK;
+}
+
+HRESULT Bho::FinalConstruct() {
+  return S_OK;
+}
+
+void Bho::FinalRelease() {
+}
+
+HRESULT STDMETHODCALLTYPE Bho::OnHttpEquiv(
+    IBrowserService_OnHttpEquiv_Fn original_httpequiv,
+    IBrowserService* browser, IShellView* shell_view, BOOL done,
+    VARIANT* in_arg, VARIANT* out_arg) {
+  if (!done && in_arg && (VT_BSTR == V_VT(in_arg))) {
+    if (StrStrI(V_BSTR(in_arg), kChromeContentPrefix)) {
+      // OnHttpEquiv is invoked for meta tags within sub frames as well.
+      // We want to switch renderers only for the top level frame. Since
+      // the same |browser| and |shell_view| are passed in to OnHttpEquiv
+      // even for sub iframes, we determine if this is the top one by
+      // checking if there are any sub frames created or not.
+      ScopedComPtr<IWebBrowser2> web_browser2;
+      DoQueryService(SID_SWebBrowserApp, browser, web_browser2.Receive());
+      if (web_browser2 && !HasSubFrames(web_browser2))
+        SwitchRenderer(web_browser2, browser, shell_view, V_BSTR(in_arg));
+    }
+  }
+
+  return original_httpequiv(browser, shell_view, done, in_arg, out_arg);
+}
+
+bool Bho::HasSubFrames(IWebBrowser2* web_browser2) {
+  bool has_sub_frames = false;
+  ScopedComPtr<IDispatch> doc_dispatch;
+  if (web_browser2) {
+    HRESULT hr = web_browser2->get_Document(doc_dispatch.Receive());
+    DCHECK(SUCCEEDED(hr) && doc_dispatch) <<
+        "web_browser2->get_Document failed. Error: " << hr;
+    ScopedComPtr<IOleContainer> container;
+    if (SUCCEEDED(hr) && doc_dispatch) {
+      container.QueryFrom(doc_dispatch);
+      ScopedComPtr<IEnumUnknown> enumerator;
+      if (container) {
+        container->EnumObjects(OLECONTF_EMBEDDINGS, enumerator.Receive());
+        ScopedComPtr<IUnknown> unk;
+        ULONG items_retrieved = 0;
+        if (enumerator)
+          enumerator->Next(1, unk.Receive(), &items_retrieved);
+        has_sub_frames = (items_retrieved != 0);
+      }
+    }
+  }
+
+  return has_sub_frames;
+}
+
+HRESULT Bho::SwitchRenderer(IWebBrowser2* web_browser2,
+    IBrowserService* browser, IShellView* shell_view,
+    const wchar_t* meta_tag) {
+  DCHECK(web_browser2 && browser && shell_view && meta_tag);
+
+  // Get access to the mshtml instance and the moniker
+  ScopedComPtr<IOleObject> mshtml_ole_object;
+  HRESULT hr = shell_view->GetItemObject(SVGIO_BACKGROUND, IID_IOleObject,
+      reinterpret_cast<void**>(mshtml_ole_object.Receive()));
+  if (!mshtml_ole_object) {
+    NOTREACHED() << "shell_view->GetItemObject failed. Error: " << hr;
+    return hr;
+  }
+
+  std::wstring url;
+  ScopedComPtr<IMoniker> moniker;
+  hr = mshtml_ole_object->GetMoniker(OLEGETMONIKER_ONLYIFTHERE,
+                                     OLEWHICHMK_OBJFULL, moniker.Receive());
+  DCHECK(moniker) << "mshtml_ole_object->GetMoniker failed. Error: " << hr;
+
+  if (moniker)
+    hr = GetUrlFromMoniker(moniker, NULL, &url);
+
+  DCHECK(!url.empty()) << "GetUrlFromMoniker failed. Error: " << hr;
+  DCHECK(!StartsWith(url, kChromeProtocolPrefix, false));
+
+  if (!url.empty()) {
+    url.insert(0, kChromeProtocolPrefix);
+    // Navigate to new url
+    VARIANT empty = ScopedVariant::kEmptyVariant;
+    VARIANT flags = { VT_I4 };
+    V_I4(&flags) = 0;
+    ScopedVariant url_var(url.c_str());
+    hr = web_browser2->Navigate2(url_var.AsInput(), &flags, &empty, &empty,
+                                 &empty);
+    DCHECK(SUCCEEDED(hr)) << "web_browser2->Navigate2 failed. Error: " << hr
+        << std::endl << "Url: " << url;
+  }
+
+  return S_OK;
+}
+
+void PatchHelper::InitializeAndPatchProtocolsIfNeeded() {
+  if (state_ != UNKNOWN)
+    return;
+
+  bool patch_protocol = GetConfigBool(true, kPatchProtocols);
+  if (patch_protocol) {
+    ProtocolSinkWrap::PatchProtocolHandler(kUrlMonDllName, CLSID_HttpProtocol);
+    ProtocolSinkWrap::PatchProtocolHandler(kUrlMonDllName, CLSID_HttpSProtocol);
+    state_ = PATCH_PROTOCOL;
+  } else {
+    state_ = PATCH_IBROWSER;
+  }
+}
+
+void PatchHelper::PatchBrowserService(IBrowserService* browser_service) {
+  DCHECK(state_ == PATCH_IBROWSER);
+  state_ = PATCH_IBROWSER_OK;
+  vtable_patch::PatchInterfaceMethods(browser_service,
+                                      IBrowserService_PatchInfo);
+}
+
+extern vtable_patch::MethodPatchInfo IInternetProtocol_PatchInfo[];
+extern vtable_patch::MethodPatchInfo IInternetProtocolEx_PatchInfo[];
+void PatchHelper::UnpatchIfNeeded() {
+  if (state_ == PATCH_PROTOCOL) {
+    vtable_patch::UnpatchInterfaceMethods(IInternetProtocol_PatchInfo);
+    vtable_patch::UnpatchInterfaceMethods(IInternetProtocolEx_PatchInfo);
+  } else if (state_ == PATCH_IBROWSER_OK) {
+    vtable_patch::UnpatchInterfaceMethods(IBrowserService_PatchInfo);
+  }
+
+  state_ = UNKNOWN;
+}
+