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// Copyright (c) 2011 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_HTTP_NEGOTIATE_H_
#define CHROME_FRAME_HTTP_NEGOTIATE_H_
#include <shdeprecated.h>
#include <urlmon.h>
#include <string>
#include "base/basictypes.h"
#include "base/scoped_comptr_win.h"
// Typedefs for IHttpNegotiate methods.
typedef HRESULT (STDMETHODCALLTYPE* IHttpNegotiate_BeginningTransaction_Fn)(
IHttpNegotiate* me, LPCWSTR url, LPCWSTR headers, DWORD reserved,
LPWSTR* additional_headers);
typedef HRESULT (STDMETHODCALLTYPE* IHttpNegotiate_OnResponse_Fn)(
IHttpNegotiate* me, DWORD response_code, LPCWSTR response_header,
LPCWSTR request_header, LPWSTR* additional_request_headers);
// Typedefs for IBindStatusCallback methods.
typedef HRESULT (STDMETHODCALLTYPE* IBindStatusCallback_StartBinding_Fn)(
IBindStatusCallback* me, DWORD reserved, IBinding *binding);
// Typedefs for IInternetProtocolSink methods.
typedef HRESULT (STDMETHODCALLTYPE* IInternetProtocolSink_ReportProgress_Fn)(
IInternetProtocolSink* me, ULONG status_code, LPCWSTR status_text);
// Patches methods of urlmon's IHttpNegotiate implementation for the purposes
// of adding to the http user agent header.
// Also patches one of the IBindStatusCallback implementations in urlmon to pick
// up an IBinding during the StartBinding call. The IBinding implementor then
// gets a patch applied to its IInternetProtocolSink's ReportProgress method.
// The patched is there so that the reporting of the MIME type to the IBinding
// implementor can be changed if an X-Chrome-Frame HTTP header is present
// in the response headers. If anyone can suggest a more straightforward way of
// doing this, I would be eternally grateful.
class HttpNegotiatePatch {
// class is not to be instantiated atm.
HttpNegotiatePatch();
~HttpNegotiatePatch();
public:
static bool Initialize();
static void Uninitialize();
// Enables and disables the User Agent header modification. It is enabled
// by default when the patch is installed.
static void set_modify_user_agent(bool value) { modify_user_agent_ = value; }
// IHttpNegotiate patch methods
static STDMETHODIMP BeginningTransaction(
IHttpNegotiate_BeginningTransaction_Fn original, IHttpNegotiate* me,
LPCWSTR url, LPCWSTR headers, DWORD reserved, LPWSTR* additional_headers);
protected:
static HRESULT PatchHttpNegotiate(IUnknown* to_patch);
private:
static bool modify_user_agent_;
DISALLOW_COPY_AND_ASSIGN(HttpNegotiatePatch);
};
// From the latest urlmon.h. Symbol name prepended with LOCAL_ to
// avoid conflict (and therefore build errors) for those building with
// a newer Windows SDK.
// TODO(robertshield): Remove this once we update our SDK version.
extern const int LOCAL_BINDSTATUS_SERVER_MIMETYPEAVAILABLE;
// Scans |additional_headers| and |headers| for User-Agent header or grabs
// the default User-Agent if none is found. Append "chromeframe" at the end
// of the string. Returns the original content of |additional_headers| but
// with the new User-Agent header. Somewhat unusual interface is dictated
// because we use it in IHttpNegotiate::BeginningTransaction.
// The function is a public since we want to use it from
// UrlmonUrlRequest::BeginningTransaction for the unusual but yet possible case
// when |headers| contains an User-Agent string.
std::string AppendCFUserAgentString(LPCWSTR headers,
LPCWSTR additional_headers);
// Adds or replaces the User-Agent header in a set of HTTP headers.
// Arguments are the same as with AppendCFUserAgentString.
std::string ReplaceOrAddUserAgent(LPCWSTR headers,
const std::string& user_agent_value);
#endif // CHROME_FRAME_HTTP_NEGOTIATE_H_
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