// Copyright (c) 2012 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/browser/android/intercept_download_resource_throttle.h"

#include "content/public/browser/android/download_controller_android.h"
#include "content/public/browser/resource_controller.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_response_headers.h"
#include "net/url_request/url_request.h"

#if defined(SPDY_PROXY_AUTH_ORIGIN)
#include "chrome/browser/net/spdyproxy/data_reduction_proxy_settings.h"
#endif  // defined(SPDY_PROXY_AUTH_ORIGIN)

namespace chrome {

InterceptDownloadResourceThrottle::InterceptDownloadResourceThrottle(
    net::URLRequest* request,
    int render_process_id,
    int render_view_id,
    int request_id)
    : request_(request),
      render_process_id_(render_process_id),
      render_view_id_(render_view_id),
      request_id_(request_id) {
}

InterceptDownloadResourceThrottle::~InterceptDownloadResourceThrottle() {
}

void InterceptDownloadResourceThrottle::WillStartRequest(bool* defer) {
  ProcessDownloadRequest();
}

void InterceptDownloadResourceThrottle::WillProcessResponse(bool* defer) {
  ProcessDownloadRequest();
}

const char* InterceptDownloadResourceThrottle::GetNameForLogging() const {
  return "InterceptDownloadResourceThrottle";
}

void InterceptDownloadResourceThrottle::ProcessDownloadRequest() {
  if (request_->method() != net::HttpRequestHeaders::kGetMethod)
    return;

  // In general, if the request uses HTTP authorization, either with the origin
  // or a proxy, then the network stack should handle the download. The one
  // exception is a request that is fetched via the Chrome Proxy and does not
  // authenticate with the origin.
  if (request_->response_info().did_use_http_auth) {
#if defined(SPDY_PROXY_AUTH_ORIGIN)
    net::HttpRequestHeaders headers;
    request_->GetFullRequestHeaders(&headers);
    if (headers.HasHeader(net::HttpRequestHeaders::kAuthorization) ||
        !DataReductionProxySettings::WasFetchedViaProxy(
            request_->response_info().headers)) {
      return;
    }
#else
    return;
#endif
  }

  if (request_->url_chain().empty())
    return;

  GURL url = request_->url_chain().back();
  if (!url.SchemeIsHTTPOrHTTPS())
    return;

  content::DownloadControllerAndroid::Get()->CreateGETDownload(
      render_process_id_, render_view_id_, request_id_);
  controller()->Cancel();
}

}  // namespace chrome