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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_BASE_TRANSPORT_INFO_H_
#define NET_BASE_TRANSPORT_INFO_H_
#include <iosfwd>
#include <string>
#include <string_view>
#include "net/base/ip_endpoint.h"
#include "net/base/net_export.h"
#include "net/socket/next_proto.h"
namespace net {
// Specifies the type of a network transport over which a resource is loaded.
enum class TransportType {
// The transport was established directly to a peer.
kDirect,
// The transport was established to a proxy of some kind.
kProxied,
// The transport was "established" to a cache entry.
kCached,
// Same as `kCached`, but the resource was initially loaded through a proxy.
kCachedFromProxy,
};
// Returns a string representation of the given transport type.
// The returned std::string_view is static, has no lifetime restrictions.
NET_EXPORT std::string_view TransportTypeToString(TransportType type);
// Describes a network transport.
struct NET_EXPORT TransportInfo {
TransportInfo();
TransportInfo(TransportType type_arg,
IPEndPoint endpoint_arg,
std::string accept_ch_frame_arg,
bool cert_is_issued_by_known_root,
NextProto negotiated_protocol);
TransportInfo(const TransportInfo&);
~TransportInfo();
// Instances of this type are comparable for equality.
bool operator==(const TransportInfo& other) const;
// Returns a string representation of this struct, suitable for debugging.
std::string ToString() const;
// The type of the transport.
TransportType type = TransportType::kDirect;
// If `type` is `kDirect`, then this identifies the peer endpoint.
// If `type` is `kProxied`, then this identifies the proxy endpoint.
// If `type` is `kCached`, then this identifies the peer endpoint from which
// the resource was originally loaded.
// If `type` is `kCachedFromProxy`, then this identifies the proxy endpoint
// from which the resource was originally loaded.
IPEndPoint endpoint;
// The value of the ACCEPT_CH HTTP2/3 frame, as pulled in through ALPS.
//
// Invariant: if `type` is `kCached` or `kCachedFromProxy`, then this is
// empty.
std::string accept_ch_frame;
// True if the transport layer was secure and the certificate was rooted at a
// standard CA root. (As opposed to a user-installed root.)
//
// Invariant: if `type` is `kCached` or `kCachedFromProxy`, then this is
// always false.
bool cert_is_issued_by_known_root = false;
// The negotiated protocol info for the transport layer.
//
// Invariant: if `type` is `kCached` or `kCachedFromProxy`, then this is
// always kProtoUnknown.
NextProto negotiated_protocol = NextProto::kProtoUnknown;
};
// Instances of these types are streamable for easier debugging.
NET_EXPORT std::ostream& operator<<(std::ostream& out, TransportType type);
NET_EXPORT std::ostream& operator<<(std::ostream& out,
const TransportInfo& info);
} // namespace net
#endif // NET_BASE_TRANSPORT_INFO_H_
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