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// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
// based on chrome/browser/plugins/plugin_response_interceptor_url_loader_throttle.cc
// Copyright 2018 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 "plugin_response_interceptor_url_loader_throttle.h"
#include "base/bind.h"
#include "base/guid.h"
#include "base/task/post_task.h"
#include "chrome/browser/extensions/api/streams_private/streams_private_api.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/download_manager.h"
#include "content/public/browser/download_request_utils.h"
#include "content/public/browser/download_utils.h"
#include "extensions/browser/guest_view/mime_handler_view/mime_handler_view_attach_helper.h"
#include "extensions/common/constants.h"
#include "extensions/common/extension.h"
#include "extensions/common/manifest_handlers/mime_types_handler.h"
#include "third_party/blink/public/mojom/loader/transferrable_url_loader.mojom.h"
#include "extensions/extension_system_qt.h"
#include "web_contents_delegate_qt.h"
#include "web_engine_settings.h"
#include <string>
#include <tuple>
namespace {
void ClearAllButFrameAncestors(network::mojom::URLResponseHead *response_head)
{
response_head->headers->RemoveHeader("Content-Security-Policy");
response_head->headers->RemoveHeader("Content-Security-Policy-Report-Only");
if (!response_head->parsed_headers)
return;
std::vector<network::mojom::ContentSecurityPolicyPtr> &csp =
response_head->parsed_headers->content_security_policy;
std::vector<network::mojom::ContentSecurityPolicyPtr> cleared;
for (auto &policy : csp) {
auto frame_ancestors = policy->directives.find(network::mojom::CSPDirectiveName::FrameAncestors);
if (frame_ancestors == policy->directives.end())
continue;
auto cleared_policy = network::mojom::ContentSecurityPolicy::New();
cleared_policy->self_origin = std::move(policy->self_origin);
cleared_policy->header = std::move(policy->header);
cleared_policy->header->header_value = "";
cleared_policy->directives[network::mojom::CSPDirectiveName::FrameAncestors] = std::move(frame_ancestors->second);
auto raw_frame_ancestors = policy->raw_directives.find(network::mojom::CSPDirectiveName::FrameAncestors);
DCHECK(raw_frame_ancestors != policy->raw_directives.end());
cleared_policy->header->header_value = "frame-ancestors " + raw_frame_ancestors->second;
response_head->headers->AddHeader(
cleared_policy->header->type == network::mojom::ContentSecurityPolicyType::kEnforce
? "Content-Security-Policy"
: "Content-Security-Policy-Report-Only",
cleared_policy->header->header_value);
cleared_policy->raw_directives[network::mojom::CSPDirectiveName::FrameAncestors] =
std::move(raw_frame_ancestors->second);
cleared.push_back(std::move(cleared_policy));
}
csp.swap(cleared);
}
} // namespace
namespace QtWebEngineCore {
PluginResponseInterceptorURLLoaderThrottle::PluginResponseInterceptorURLLoaderThrottle(
network::mojom::RequestDestination request_destination,
int frame_tree_node_id)
: m_request_destination(request_destination), m_frame_tree_node_id(frame_tree_node_id)
{}
void PluginResponseInterceptorURLLoaderThrottle::WillProcessResponse(const GURL &response_url,
network::mojom::URLResponseHead *response_head,
bool *defer)
{
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
if (content::download_utils::MustDownload(response_url, response_head->headers.get(), response_head->mime_type))
return;
content::WebContents *web_contents = content::WebContents::FromFrameTreeNodeId(m_frame_tree_node_id);
if (!web_contents)
return;
std::string extension_id;
if (response_head->mime_type == "application/pdf")
extension_id = extension_misc::kPdfExtensionId;
if (extension_id.empty())
return;
WebContentsDelegateQt *contentsDelegate = static_cast<WebContentsDelegateQt *>(web_contents->GetDelegate());
if (!contentsDelegate)
return;
WebEngineSettings *settings = contentsDelegate->webEngineSettings();
if (!settings->testAttribute(QWebEngineSettings::PdfViewerEnabled)
|| !settings->testAttribute(QWebEngineSettings::PluginsEnabled)) {
// PluginServiceFilterQt will inform the URLLoader about the disabled state of plugins
// and we can expect the download to be triggered automatically. It's unnecessary to
// go further and start the guest view embedding process.
return;
}
// Chrome's PDF Extension does not work properly in the face of a restrictive
// Content-Security-Policy, and does not currently respect the policy anyway.
// Ignore CSP served on a PDF response. https://crbug.com/271452
if (extension_id == extension_misc::kPdfExtensionId && response_head->headers)
ClearAllButFrameAncestors(response_head);
MimeTypesHandler::ReportUsedHandler(extension_id);
std::string view_id = base::GenerateGUID();
// The string passed down to the original client with the response body.
std::string payload = view_id;
mojo::PendingRemote<network::mojom::URLLoader> dummy_new_loader;
std::ignore = dummy_new_loader.InitWithNewPipeAndPassReceiver();
mojo::Remote<network::mojom::URLLoaderClient> new_client;
mojo::PendingReceiver<network::mojom::URLLoaderClient> new_client_receiver =
new_client.BindNewPipeAndPassReceiver();
uint32_t data_pipe_size = 64U;
// Provide the MimeHandlerView code a chance to override the payload. This is
// the case where the resource is handled by frame-based MimeHandlerView.
*defer = extensions::MimeHandlerViewAttachHelper::OverrideBodyForInterceptedResponse(
m_frame_tree_node_id, response_url, response_head->mime_type, view_id,
&payload, &data_pipe_size,
base::BindOnce(
&PluginResponseInterceptorURLLoaderThrottle::ResumeLoad,
weak_factory_.GetWeakPtr()));
mojo::ScopedDataPipeProducerHandle producer_handle;
mojo::ScopedDataPipeConsumerHandle consumer_handle;
CHECK_EQ(MOJO_RESULT_OK, mojo::CreateDataPipe(data_pipe_size, producer_handle, consumer_handle));
uint32_t len = static_cast<uint32_t>(payload.size());
CHECK_EQ(MOJO_RESULT_OK,
producer_handle->WriteData(
payload.c_str(), &len, MOJO_WRITE_DATA_FLAG_ALL_OR_NONE));
new_client->OnStartLoadingResponseBody(std::move(consumer_handle));
network::URLLoaderCompletionStatus status(net::OK);
status.decoded_body_length = len;
new_client->OnComplete(status);
mojo::PendingRemote<network::mojom::URLLoader> original_loader;
mojo::PendingReceiver<network::mojom::URLLoaderClient> original_client;
mojo::ScopedDataPipeConsumerHandle body;
delegate_->InterceptResponse(std::move(dummy_new_loader),
std::move(new_client_receiver),
&original_loader, &original_client,
&body);
// Make a deep copy of URLResponseHead before passing it cross-thread.
auto deep_copied_response = response_head->Clone();
if (response_head->headers) {
deep_copied_response->headers =
base::MakeRefCounted<net::HttpResponseHeaders>(
response_head->headers->raw_headers());
}
auto transferrable_loader = blink::mojom::TransferrableURLLoader::New();
transferrable_loader->url = GURL(
extensions::Extension::GetBaseURLFromExtensionId(extension_id).spec() +
base::GenerateGUID());
transferrable_loader->url_loader = std::move(original_loader);
transferrable_loader->url_loader_client = std::move(original_client);
transferrable_loader->head = std::move(deep_copied_response);
transferrable_loader->head->intercepted_by_plugin = true;
transferrable_loader->body = std::move(body);
bool embedded = m_request_destination !=
network::mojom::RequestDestination::kDocument;
content::GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(
&extensions::StreamsPrivateAPI::SendExecuteMimeTypeHandlerEvent,
extension_id, view_id, embedded, m_frame_tree_node_id,
std::move(transferrable_loader), response_url));
}
void PluginResponseInterceptorURLLoaderThrottle::ResumeLoad()
{
delegate_->Resume();
}
} // namespace QtWebEngineCore
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