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// Copyright 2025 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_RENDERER_LOCAL_RESOURCE_URL_LOADER_FACTORY_H_
#define CONTENT_RENDERER_LOCAL_RESOURCE_URL_LOADER_FACTORY_H_
#include <cstdint>
#include <memory>
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_refptr.h"
#include "base/task/sequenced_task_runner.h"
#include "base/threading/sequence_bound.h"
#include "content/common/content_export.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/receiver_set.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "net/socket/socket.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/mojom/url_loader.mojom.h"
#include "services/network/public/mojom/url_loader_factory.mojom.h"
#include "third_party/blink/public/mojom/loader/local_resource_loader_config.mojom.h"
#include "url/origin.h"
namespace content {
// LocalResourceURLLoaderFactory is a URLLoaderFactory that lives in the
// renderer process and fetches resources directly from the ResourceBundle,
// enabling renderers to load bundled resources entirely in-process. This can
// significantly reduce IPC overhead for WebUIs, whose resources come almost
// exclusively from the ResourceBundle.
class CONTENT_EXPORT LocalResourceURLLoaderFactory
: public network::mojom::URLLoaderFactory {
public:
struct Source {
Source(blink::mojom::LocalResourceSourcePtr source,
std::map<std::string, std::string> replacement_strings);
Source(Source&& other);
Source& operator=(Source&& other);
~Source();
blink::mojom::LocalResourceSourcePtr source;
std::map<std::string, std::string> replacement_strings;
};
LocalResourceURLLoaderFactory(
blink::mojom::LocalResourceLoaderConfigPtr config,
mojo::PendingRemote<network::mojom::URLLoaderFactory> fallback);
~LocalResourceURLLoaderFactory() override;
// network::mojom::URLLoaderFactory implementation.
void CreateLoaderAndStart(
mojo::PendingReceiver<network::mojom::URLLoader> loader,
int32_t request_id,
uint32_t options,
const network::ResourceRequest& request,
mojo::PendingRemote<network::mojom::URLLoaderClient> client,
const net::MutableNetworkTrafficAnnotationTag& traffic_annotation)
override;
void Clone(mojo::PendingReceiver<network::mojom::URLLoaderFactory> receiver)
override;
private:
// CanServe returns true if and only if all of the following are true:
//
// 1. The LocalResourceURLLoaderFactory has a resource ID for the given URL
// (which depends on the resource metadata received from the browser
// process), and
// 2. The resource ID corresponds to a resource that exists in
// 'resources.pak'.
//
// It should return false in the following cases:
//
// 1. For dynamic resources that are generated on-the-fly in the browser
// process (e.g. strings.m.js, chrome://theme/colors.css).
// 2. For static resources that reside in a pak file that is not
// memory-mapped in the renderer process (e.g. browser_tests.pak).
//
// CanServe is called internally for every resource request to decide whether
// the request can be serviced in-process or if it has to be serviced
// out-of-process.
bool CanServe(const network::ResourceRequest& request) const;
// Fetches the resource from the ResourceBundle and sends it to the
// URLLoaderClient. This is static because it is posted as a task which may
// outlive |this|.
static void GetResourceAndRespond(
const scoped_refptr<base::RefCountedData<std::map<url::Origin, Source>>>
sources,
const network::ResourceRequest& request,
mojo::PendingRemote<network::mojom::URLLoaderClient> client);
// Map for resolving origins to their respective source metadata
// (path-to-resource-ID mappings and string replacement maps).
// It is ref-counted because it needs to be accessed in an async call to
// GetResourceAndRespond, which may outlive |this|.
const scoped_refptr<base::RefCountedData<std::map<url::Origin, Source>>>
sources_;
// Pipe to fallback factory, which should be the WebUIURLLoaderFactory in the
// browser process. This is required because there are certain resources that
// cannot be serviced in-process and must be serviced by the browser process.
// See the CanServe method for more details.
const mojo::Remote<network::mojom::URLLoaderFactory> fallback_;
// Pipes to callers of the Clone method.
mojo::ReceiverSet<network::mojom::URLLoaderFactory> receivers_;
};
} // namespace content
#endif // CONTENT_RENDERER_LOCAL_RESOURCE_URL_LOADER_FACTORY_H_
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