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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.
#include "chrome_frame/http_negotiate.h"
#include <atlbase.h>
#include <atlcom.h>
#include "base/logging.h"
#include "base/scoped_ptr.h"
#include "base/string_util.h"
#include "chrome_frame/html_utils.h"
#include "chrome_frame/urlmon_url_request.h"
#include "chrome_frame/utils.h"
#include "chrome_frame/vtable_patch_manager.h"
static const int kHttpNegotiateBeginningTransactionIndex = 3;
static const int kHttpNegotiateOnResponseTransactionIndex = 4;
BEGIN_VTABLE_PATCHES(IHttpNegotiate)
VTABLE_PATCH_ENTRY(kHttpNegotiateBeginningTransactionIndex,
HttpNegotiatePatch::BeginningTransaction)
VTABLE_PATCH_ENTRY(kHttpNegotiateOnResponseTransactionIndex,
HttpNegotiatePatch::OnResponse)
END_VTABLE_PATCHES()
HttpNegotiatePatch::HttpNegotiatePatch() {
}
HttpNegotiatePatch::~HttpNegotiatePatch() {
}
// static
bool HttpNegotiatePatch::Initialize() {
if (IS_PATCHED(IHttpNegotiate)) {
DLOG(WARNING) << __FUNCTION__ << " called more than once.";
return true;
}
// Use our UrlmonUrlRequest class as we need a temporary object that
// implements IBindStatusCallback.
CComObjectStackEx<UrlmonUrlRequest> request;
ScopedComPtr<IBindCtx> bind_ctx;
HRESULT hr = CreateAsyncBindCtx(0, &request, NULL, bind_ctx.Receive());
DCHECK(SUCCEEDED(hr)) << "CreateAsyncBindCtx";
if (bind_ctx) {
ScopedComPtr<IUnknown> bscb_holder;
bind_ctx->GetObjectParam(L"_BSCB_Holder_", bscb_holder.Receive());
if (bscb_holder) {
hr = PatchHttpNegotiate(bscb_holder);
} else {
NOTREACHED() << "Failed to get _BSCB_Holder_";
hr = E_UNEXPECTED;
}
bind_ctx.Release();
}
return SUCCEEDED(hr);
}
// static
void HttpNegotiatePatch::Uninitialize() {
vtable_patch::UnpatchInterfaceMethods(IHttpNegotiate_PatchInfo);
}
// static
HRESULT HttpNegotiatePatch::PatchHttpNegotiate(IUnknown* to_patch) {
DCHECK(to_patch);
DCHECK_IS_NOT_PATCHED(IHttpNegotiate);
ScopedComPtr<IHttpNegotiate> http;
HRESULT hr = http.QueryFrom(to_patch);
if (FAILED(hr)) {
hr = DoQueryService(IID_IHttpNegotiate, to_patch, http.Receive());
}
if (http) {
hr = vtable_patch::PatchInterfaceMethods(http, IHttpNegotiate_PatchInfo);
DLOG_IF(ERROR, FAILED(hr))
<< StringPrintf("HttpNegotiate patch failed 0x%08X", hr);
} else {
DLOG(WARNING)
<< StringPrintf("IHttpNegotiate not supported 0x%08X", hr);
}
return hr;
}
// static
HRESULT HttpNegotiatePatch::BeginningTransaction(
IHttpNegotiate_BeginningTransaction_Fn original, IHttpNegotiate* me,
LPCWSTR url, LPCWSTR headers, DWORD reserved, LPWSTR* additional_headers) {
DLOG(INFO) << __FUNCTION__ << " " << url;
HRESULT hr = original(me, url, headers, reserved, additional_headers);
if (FAILED(hr)) {
DLOG(WARNING) << __FUNCTION__ << " Delegate returned an error";
return hr;
}
static const char kLowerCaseUserAgent[] = "user-agent";
using net::HttpUtil;
std::string ascii_headers;
if (*additional_headers)
ascii_headers = WideToASCII(*additional_headers);
HttpUtil::HeadersIterator headers_iterator(ascii_headers.begin(),
ascii_headers.end(), "\r\n");
std::string user_agent_value;
if (headers_iterator.AdvanceTo(kLowerCaseUserAgent)) {
user_agent_value = headers_iterator.values();
} else if (headers != NULL) {
// See if there's a user-agent header specified in the original headers.
std::string original_headers(WideToASCII(headers));
HttpUtil::HeadersIterator original_it(original_headers.begin(),
original_headers.end(), "\r\n");
if (original_it.AdvanceTo(kLowerCaseUserAgent))
user_agent_value = original_it.values();
}
// Use the default one if none was provided.
if (user_agent_value.empty())
user_agent_value = http_utils::GetDefaultUserAgent();
// Now add chromeframe to it.
user_agent_value = http_utils::AddChromeFrameToUserAgentValue(
user_agent_value);
// Build new headers, skip the existing user agent value from
// existing headers.
std::string new_headers;
headers_iterator.Reset();
while (headers_iterator.GetNext()) {
std::string name(headers_iterator.name());
if (!LowerCaseEqualsASCII(name, kLowerCaseUserAgent)) {
new_headers += name + ": " + headers_iterator.values() + "\r\n";
}
}
new_headers += "User-Agent: " + user_agent_value;
new_headers += "\r\n\r\n";
if (*additional_headers)
::CoTaskMemFree(*additional_headers);
*additional_headers = reinterpret_cast<wchar_t*>(::CoTaskMemAlloc(
(new_headers.length() + 1) * sizeof(wchar_t)));
lstrcpyW(*additional_headers, ASCIIToWide(new_headers).c_str());
return hr;
}
// static
HRESULT HttpNegotiatePatch::OnResponse(IHttpNegotiate_OnResponse_Fn original,
IHttpNegotiate* me, DWORD response_code, LPCWSTR response_header,
LPCWSTR request_header, LPWSTR* additional_request_headers) {
HRESULT hr = original(me, response_code, response_header, request_header,
additional_request_headers);
return hr;
}
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