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// 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.
#ifndef CHROME_FRAME_BHO_H_
#define CHROME_FRAME_BHO_H_
#include <string>
#include <atlbase.h>
#include <atlcom.h>
#include <exdisp.h>
#include <exdispid.h>
#include <mshtml.h>
#include <shdeprecated.h>
#include "base/lazy_instance.h"
#include "base/thread_local.h"
#include "chrome_tab.h" // NOLINT
#include "chrome_frame/resource.h"
#include "grit/chrome_frame_resources.h"
class PatchHelper {
public:
enum State { UNKNOWN, PATCH_IBROWSER, PATCH_IBROWSER_OK, PATCH_PROTOCOL };
PatchHelper() : state_(UNKNOWN) {
}
State state() const {
return state_;
}
// Returns true if protocols were patched, false if patching has already
// been done.
bool InitializeAndPatchProtocolsIfNeeded();
void PatchBrowserService(IBrowserService* p);
void UnpatchIfNeeded();
protected:
State state_;
};
// Single global variable
extern PatchHelper g_patch_helper;
class ATL_NO_VTABLE Bho
: public CComObjectRootEx<CComSingleThreadModel>,
public CComCoClass<Bho, &CLSID_ChromeFrameBHO>,
public IObjectWithSiteImpl<Bho>,
public IDispEventSimpleImpl<0, Bho, &DIID_DWebBrowserEvents2> {
public:
typedef HRESULT (STDMETHODCALLTYPE* IBrowserService_OnHttpEquiv_Fn)(
IBrowserService* browser, IShellView* shell_view, BOOL done,
VARIANT* in_arg, VARIANT* out_arg);
DECLARE_REGISTRY_RESOURCEID(IDR_BHO)
DECLARE_NOT_AGGREGATABLE(Bho)
DECLARE_PROTECT_FINAL_CONSTRUCT()
BEGIN_COM_MAP(Bho)
COM_INTERFACE_ENTRY(IObjectWithSite)
END_COM_MAP()
BEGIN_SINK_MAP(Bho)
SINK_ENTRY_INFO(0, DIID_DWebBrowserEvents2, DISPID_BEFORENAVIGATE2,
BeforeNavigate2, &kBeforeNavigate2Info)
END_SINK_MAP()
// Lifetime management methods
Bho();
HRESULT FinalConstruct();
void FinalRelease();
// IObjectWithSite
STDMETHODIMP SetSite(IUnknown* site);
STDMETHOD(BeforeNavigate2)(IDispatch* dispatch, VARIANT* url, VARIANT* flags,
VARIANT* target_frame_name, VARIANT* post_data, VARIANT* headers,
VARIANT_BOOL* cancel);
// mshtml sends an IOleCommandTarget::Exec of OLECMDID_HTTPEQUIV
// (and OLECMDID_HTTPEQUIV_DONE) as soon as it parses a meta tag.
// It also sends contents of the meta tag as an argument. IEFrame
// handles this in IBrowserService::OnHttpEquiv. So this allows
// us to sniff the META tag by simply patching it. The renderer
// switching can be achieved by cancelling original navigation
// and issuing a new one using IWebBrowser2->Navigate2.
static HRESULT STDMETHODCALLTYPE OnHttpEquiv(
IBrowserService_OnHttpEquiv_Fn original_httpequiv,
IBrowserService* browser, IShellView* shell_view, BOOL done,
VARIANT* in_arg, VARIANT* out_arg);
std::string referrer() const {
return referrer_;
}
// Returns the Bho instance for the current thread. This is returned from
// TLS.
static Bho* GetCurrentThreadBhoInstance();
protected:
bool PatchProtocolHandler(const CLSID& handler_clsid);
static bool HasSubFrames(IWebBrowser2* web_browser2);
static HRESULT SwitchRenderer(IWebBrowser2* web_browser2,
IBrowserService* browser, IShellView* shell_view,
const wchar_t* meta_tag);
std::string referrer_;
static base::LazyInstance<base::ThreadLocalPointer<Bho> >
bho_current_thread_instance_;
static _ATL_FUNC_INFO kBeforeNavigate2Info;
};
// Add Bho to class library table so IE can CoCreate it.
OBJECT_ENTRY_AUTO(CLSID_ChromeFrameBHO, Bho);
#endif // CHROME_FRAME_BHO_H_
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