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// 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 "content/browser/download/download_resource_handler.h"
#include <string>
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/strings/stringprintf.h"
#include "content/browser/byte_stream.h"
#include "content/browser/download/download_create_info.h"
#include "content/browser/download/download_interrupt_reasons_impl.h"
#include "content/browser/download/download_manager_impl.h"
#include "content/browser/download/download_request_handle.h"
#include "content/browser/loader/resource_dispatcher_host_impl.h"
#include "content/browser/loader/resource_request_info_impl.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/download_interrupt_reasons.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/resource_response.h"
namespace content {
struct DownloadResourceHandler::DownloadTabInfo {
GURL tab_url;
GURL tab_referrer_url;
};
namespace {
// Static function in order to prevent any accidental accesses to
// DownloadResourceHandler members from the UI thread.
static void StartOnUIThread(
scoped_ptr<DownloadCreateInfo> info,
scoped_ptr<DownloadResourceHandler::DownloadTabInfo> tab_info,
scoped_ptr<ByteStreamReader> stream,
const DownloadUrlParameters::OnStartedCallback& started_cb) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DownloadManager* download_manager =
info->request_handle->GetDownloadManager();
if (!download_manager) {
// NULL in unittests or if the page closed right after starting the
// download.
if (!started_cb.is_null())
started_cb.Run(nullptr, DOWNLOAD_INTERRUPT_REASON_USER_CANCELED);
if (stream)
BrowserThread::DeleteSoon(BrowserThread::FILE, FROM_HERE,
stream.release());
return;
}
info->tab_url = tab_info->tab_url;
info->tab_referrer_url = tab_info->tab_referrer_url;
download_manager->StartDownload(std::move(info), std::move(stream),
started_cb);
}
void InitializeDownloadTabInfoOnUIThread(
const DownloadRequestHandle& request_handle,
DownloadResourceHandler::DownloadTabInfo* tab_info) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
WebContents* web_contents = request_handle.GetWebContents();
if (web_contents) {
NavigationEntry* entry = web_contents->GetController().GetVisibleEntry();
if (entry) {
tab_info->tab_url = entry->GetURL();
tab_info->tab_referrer_url = entry->GetReferrer().url;
}
}
}
void DeleteOnUIThread(
scoped_ptr<DownloadResourceHandler::DownloadTabInfo> tab_info) {}
} // namespace
DownloadResourceHandler::DownloadResourceHandler(net::URLRequest* request)
: ResourceHandler(request),
tab_info_(new DownloadTabInfo()),
core_(request, this) {
// Do UI thread initialization for tab_info_ asap after
// DownloadResourceHandler creation since the tab could be navigated
// before StartOnUIThread gets called. This is safe because deletion
// will occur via PostTask() as well, which will serialized behind this
// PostTask()
const ResourceRequestInfoImpl* request_info = GetRequestInfo();
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(
&InitializeDownloadTabInfoOnUIThread,
DownloadRequestHandle(AsWeakPtr(),
request_info->GetWebContentsGetterForRequest()),
tab_info_.get()));
}
DownloadResourceHandler::~DownloadResourceHandler() {
if (tab_info_) {
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&DeleteOnUIThread, base::Passed(&tab_info_)));
}
}
bool DownloadResourceHandler::OnRequestRedirected(
const net::RedirectInfo& redirect_info,
ResourceResponse* response,
bool* defer) {
return core_.OnRequestRedirected();
}
// Send the download creation information to the download thread.
bool DownloadResourceHandler::OnResponseStarted(
ResourceResponse* response,
bool* defer) {
// The MIME type in ResourceResponse is the product of
// MimeTypeResourceHandler.
return core_.OnResponseStarted(response->head.mime_type);
}
bool DownloadResourceHandler::OnWillStart(const GURL& url, bool* defer) {
return true;
}
bool DownloadResourceHandler::OnBeforeNetworkStart(const GURL& url,
bool* defer) {
return true;
}
// Create a new buffer, which will be handed to the download thread for file
// writing and deletion.
bool DownloadResourceHandler::OnWillRead(scoped_refptr<net::IOBuffer>* buf,
int* buf_size,
int min_size) {
return core_.OnWillRead(buf, buf_size, min_size);
}
// Pass the buffer to the download file writer.
bool DownloadResourceHandler::OnReadCompleted(int bytes_read, bool* defer) {
return core_.OnReadCompleted(bytes_read, defer);
}
void DownloadResourceHandler::OnResponseCompleted(
const net::URLRequestStatus& status,
const std::string& security_info,
bool* defer) {
core_.OnResponseCompleted(status);
}
void DownloadResourceHandler::OnDataDownloaded(int bytes_downloaded) {
NOTREACHED();
}
void DownloadResourceHandler::PauseRequest() {
core_.PauseRequest();
}
void DownloadResourceHandler::ResumeRequest() {
core_.ResumeRequest();
}
void DownloadResourceHandler::OnStart(
scoped_ptr<DownloadCreateInfo> create_info,
scoped_ptr<ByteStreamReader> stream_reader,
const DownloadUrlParameters::OnStartedCallback& callback) {
// If the user cancels the download, then don't call start. Instead ignore the
// download entirely.
if (create_info->result == DOWNLOAD_INTERRUPT_REASON_USER_CANCELED &&
create_info->download_id == DownloadItem::kInvalidId) {
if (!callback.is_null())
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(callback, nullptr, create_info->result));
return;
}
const ResourceRequestInfoImpl* request_info = GetRequestInfo();
create_info->has_user_gesture = request_info->HasUserGesture();
create_info->transition_type = request_info->GetPageTransition();
create_info->request_handle.reset(new DownloadRequestHandle(
AsWeakPtr(), request_info->GetWebContentsGetterForRequest()));
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&StartOnUIThread, base::Passed(&create_info),
base::Passed(&tab_info_), base::Passed(&stream_reader),
callback));
}
void DownloadResourceHandler::OnReadyToRead() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
controller()->Resume();
}
void DownloadResourceHandler::CancelRequest() {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
const ResourceRequestInfoImpl* info = GetRequestInfo();
ResourceDispatcherHostImpl::Get()->CancelRequest(
info->GetChildID(),
info->GetRequestID());
// This object has been deleted.
}
std::string DownloadResourceHandler::DebugString() const {
const ResourceRequestInfoImpl* info = GetRequestInfo();
return base::StringPrintf("{"
" url_ = " "\"%s\""
" info = {"
" child_id = " "%d"
" request_id = " "%d"
" route_id = " "%d"
" }"
" }",
request() ?
request()->url().spec().c_str() :
"<NULL request>",
info->GetChildID(),
info->GetRequestID(),
info->GetRouteID());
}
} // namespace content
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