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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_LOADER_SUBRESOURCE_PROXYING_URL_LOADER_H_
#define CONTENT_BROWSER_LOADER_SUBRESOURCE_PROXYING_URL_LOADER_H_
#include <memory>
#include <optional>
#include <string>
#include "base/memory/weak_ptr.h"
#include "content/public/browser/weak_document_ptr.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/mojom/url_loader.mojom.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
#include "url/gurl.h"
namespace network {
class SharedURLLoaderFactory;
}
namespace content {
// A URLLoader for handling proxied subresource request. Note that prefetch is
// also proxied but uses a separate loader.
//
// This loader intercepts requests and responses (including the redirected
// ones), and forwards the potentially modified requests and responses to the
// originally intended endpoints (with `loader_` and `forwarding_client_`).
class CONTENT_EXPORT SubresourceProxyingURLLoader
: public network::mojom::URLLoader,
public network::mojom::URLLoaderClient {
public:
class Interceptor {
public:
virtual void WillStartRequest(net::HttpRequestHeaders& headers) = 0;
// `removed_headers` and `modified_headers` can be modified by other
// interceptors, and registration order would matter.
virtual void WillFollowRedirect(
const std::optional<GURL>& new_url,
std::vector<std::string>& removed_headers,
net::HttpRequestHeaders& modified_headers) = 0;
// `head` can be modified by other interceptors, and registration order
// would matter.
virtual void OnReceiveRedirect(
const net::RedirectInfo& redirect_info,
network::mojom::URLResponseHeadPtr& head) = 0;
// `head` can be modified by other interceptors, and registration order
// would matter.
virtual void OnReceiveResponse(
network::mojom::URLResponseHeadPtr& head) = 0;
virtual ~Interceptor() = default;
};
SubresourceProxyingURLLoader(
WeakDocumentPtr document,
int32_t request_id,
uint32_t options,
const network::ResourceRequest& resource_request,
mojo::PendingRemote<network::mojom::URLLoaderClient> client,
const net::MutableNetworkTrafficAnnotationTag& traffic_annotation,
scoped_refptr<network::SharedURLLoaderFactory> network_loader_factory);
SubresourceProxyingURLLoader(const SubresourceProxyingURLLoader&) = delete;
SubresourceProxyingURLLoader& operator=(const SubresourceProxyingURLLoader&) =
delete;
~SubresourceProxyingURLLoader() override;
private:
// network::mojom::URLLoader overrides:
void FollowRedirect(
const std::vector<std::string>& removed_headers,
const net::HttpRequestHeaders& modified_headers,
const net::HttpRequestHeaders& modified_cors_exempt_headers,
const std::optional<GURL>& new_url) override;
void SetPriority(net::RequestPriority priority,
int intra_priority_value) override;
// network::mojom::URLLoaderClient overrides:
void OnReceiveEarlyHints(network::mojom::EarlyHintsPtr early_hints) override;
void OnReceiveResponse(
network::mojom::URLResponseHeadPtr head,
mojo::ScopedDataPipeConsumerHandle body,
std::optional<mojo_base::BigBuffer> cached_metadata) override;
void OnReceiveRedirect(const net::RedirectInfo& redirect_info,
network::mojom::URLResponseHeadPtr head) override;
void OnUploadProgress(int64_t current_position,
int64_t total_size,
base::OnceCallback<void()> callback) override;
void OnTransferSizeUpdated(int32_t transfer_size_diff) override;
void OnComplete(const network::URLLoaderCompletionStatus& status) override;
void OnNetworkConnectionError();
// The initial request state without any modification.
const network::ResourceRequest resource_request_;
// For the actual request.
mojo::Remote<network::mojom::URLLoader> loader_;
// The client to forward the response to.
mojo::Remote<network::mojom::URLLoaderClient> forwarding_client_;
std::vector<std::unique_ptr<Interceptor>> interceptors_;
mojo::Receiver<network::mojom::URLLoaderClient> client_receiver_{this};
};
} // namespace content
#endif // CONTENT_BROWSER_LOADER_SUBRESOURCE_PROXYING_URL_LOADER_H_
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