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// Copyright (c) 2010 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_URLMON_MONIKER_H_
#define CHROME_FRAME_URLMON_MONIKER_H_
#include <atlbase.h>
#include <atlcom.h>
#include <urlmon.h>
#include <string>
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/thread_local.h"
#include "googleurl/src/gurl.h"
#include "chrome_frame/utils.h"
// This file contains classes that are used to cache the contents of a top-level
// http request (not for sub frames) while that request is parsed for the
// presence of a meta tag indicating that the page should be rendered in CF.
// Here are a few scenarios we handle and how the classes come to play.
//
// Scenario 1: Non CF url navigation through address bar (www.msn.com)
// - Bho::BeforeNavigate - top level url = www.msn.com
// - MSHTML -> MonikerPatch::BindToStorage.
// (IEFrame starts this by calling mshtml!*SuperNavigate*)
// - check if the url is a top level url
// - iff the url is a top level url, we switch in our own callback object
// and hook it up to the bind context (BSCBStorageBind)
// - otherwise just call the original
// - BSCBStorageBind::OnDataAvailable - sniffs data and determines that the
// renderer is not chrome. Goes into pass through mode.
// - The page loads in mshtml.
//
//
// Scenario 2: CF navigation through address bar URL
// - Bho::BeforeNavigate - top level url = http://wave.google.com/
// - MSHTML -> MonikerPatch::BindToStorage.
// (IEFrame starts this by calling mshtml!*SuperNavigate*)
// - request_data is NULL
// - check if the url is a top level url
// - iff the url is a top level url, we switch in our own callback object
// and hook it up to the bind context (BSCBStorageBind)
// - BSCBStorageBind::OnDataAvailable - sniffs data and determines that the
// renderer is chrome. It then registers a special bind context param and
// sets a magic clip format in the format_etc. Then goes into pass through
// mode.
// - mshtml looks at the clip format and re-issues the navigation with the
// same bind context. Also returns INET_E_TERMINATED_BIND so that same
// underlying transaction objects are used.
// - IEFrame -> MonikerPatch::BindToStorage
// - We check for the special bind context param and instantiate and
// return our ActiveDoc
//
// Scenario 3: CF navigation through mshtml link
// Same as scenario #2.
//
//
// Scenario 4: CF navigation through link click in chrome loads non CF page
// - Link click comes to ChromeActiveDocument::OnOpenURL
// - web_browser->Navigate with URL
// - [Scenario 1]
//
//
// Scenario 5: CF navigation through link click in chrome loads CF page
// - Link click comes to ChromeActiveDocument::OnOpenURL
// - web_browser->Navigate with URL
// - [Scenario 2]
//
// This class is the link between a few static, moniker related functions to
// the bho. The specific services needed by those functions are abstracted into
// this interface for easier testability.
class NavigationManager {
public:
NavigationManager() {
}
// Returns the Bho instance for the current thread. This is returned from
// TLS. Returns NULL if no instance exists on the current thread.
static NavigationManager* GetThreadInstance();
void RegisterThreadInstance();
void UnregisterThreadInstance();
virtual ~NavigationManager() {
DCHECK(GetThreadInstance() != this);
}
// Returns the url of the current top level navigation.
const std::wstring& url() const {
return url_;
}
// Called to set the current top level URL that's being navigated to.
void set_url(const wchar_t* url) {
DVLOG(1) << __FUNCTION__ << " " << url;
url_ = url;
}
// Returns the referrer header value of the current top level navigation.
const std::string& referrer() const {
return referrer_;
}
void set_referrer(const std::string& referrer) {
referrer_ = referrer;
}
// Return true if this is a URL that represents a top-level
// document that might have to be rendered in CF.
virtual bool IsTopLevelUrl(const wchar_t* url);
// Called when we've detected the http-equiv meta tag in the current page
// and need to switch over from mshtml to CF.
virtual HRESULT NavigateToCurrentUrlInCF(IBrowserService* browser);
protected:
std::string referrer_;
std::wstring url_;
static base::LazyInstance<base::ThreadLocalPointer<NavigationManager> >
thread_singleton_;
private:
DISALLOW_COPY_AND_ASSIGN(NavigationManager);
};
// static-only class that manages an IMoniker patch.
// We need this patch to stay in the loop when top-level HTML content is
// downloaded that might have the CF http-equiv meta tag.
// When we detect candidates for those requests, we add our own callback
// object (as explained at the top of this file) and use it to cache the
// original document contents in order to avoid multiple network trips
// if we need to switch the renderer over to CF.
class MonikerPatch {
MonikerPatch() {} // no instances should be created of this class.
public:
// Patches two IMoniker methods, BindToObject and BindToStorage.
static bool Initialize();
// Nullifies the IMoniker patches.
static void Uninitialize();
// Typedefs for IMoniker methods.
typedef HRESULT (STDMETHODCALLTYPE* IMoniker_BindToObject_Fn)(IMoniker* me,
IBindCtx* bind_ctx, IMoniker* to_left, REFIID iid, void** obj);
typedef HRESULT (STDMETHODCALLTYPE* IMoniker_BindToStorage_Fn)(IMoniker* me,
IBindCtx* bind_ctx, IMoniker* to_left, REFIID iid, void** obj);
static STDMETHODIMP BindToObject(IMoniker_BindToObject_Fn original,
IMoniker* me, IBindCtx* bind_ctx,
IMoniker* to_left, REFIID iid, void** obj);
static STDMETHODIMP BindToStorage(IMoniker_BindToStorage_Fn original,
IMoniker* me, IBindCtx* bind_ctx,
IMoniker* to_left, REFIID iid, void** obj);
};
extern wchar_t* kChromeRequestParam;
#endif // CHROME_FRAME_URLMON_MONIKER_H_
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