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// Copyright (c) 2015 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.
// This file contains data structures and utility functions used for serializing
// and parsing alternative service header values, common to HTTP/1.1 header
// fields and HTTP/2 and QUIC ALTSVC frames. See specification at
// https://httpwg.github.io/http-extensions/alt-svc.html.
#ifndef NET_SPDY_SPDY_ALT_SVC_WIRE_FORMAT_H_
#define NET_SPDY_SPDY_ALT_SVC_WIRE_FORMAT_H_
#include <vector>
#include "base/basictypes.h"
#include "base/strings/string_piece.h"
#include "net/base/net_export.h"
using base::StringPiece;
namespace net {
namespace test {
class SpdyAltSvcWireFormatPeer;
} // namespace test
class NET_EXPORT_PRIVATE SpdyAltSvcWireFormat {
public:
struct NET_EXPORT_PRIVATE AlternativeService {
std::string protocol_id;
std::string host;
// Default is 0: invalid port.
uint16 port = 0;
// Default is 0: unspecified version.
uint16 version = 0;
// Default is one day.
uint32 max_age = 86400;
// Default is always use.
double probability = 1.0;
AlternativeService();
AlternativeService(const std::string& protocol_id,
const std::string& host,
uint16 port,
uint16 version,
uint32 max_age,
double probability);
bool operator==(const AlternativeService& other) const {
return protocol_id == other.protocol_id && host == other.host &&
port == other.port && version == other.version &&
max_age == other.max_age && probability == other.probability;
}
};
// An empty vector means alternative services should be cleared for given
// origin. Note that the wire format for this is the string "clear", not an
// empty value (which is invalid).
typedef std::vector<AlternativeService> AlternativeServiceVector;
friend class test::SpdyAltSvcWireFormatPeer;
static bool ParseHeaderFieldValue(StringPiece value,
AlternativeServiceVector* altsvc_vector);
static std::string SerializeHeaderFieldValue(
const AlternativeServiceVector& altsvc_vector);
private:
static void SkipWhiteSpace(StringPiece::const_iterator* c,
StringPiece::const_iterator end);
static bool PercentDecode(StringPiece::const_iterator c,
StringPiece::const_iterator end,
std::string* output);
static bool ParseAltAuthority(StringPiece::const_iterator c,
StringPiece::const_iterator end,
std::string* host,
uint16* port);
static bool ParsePositiveInteger16(StringPiece::const_iterator c,
StringPiece::const_iterator end,
uint16* value);
static bool ParsePositiveInteger32(StringPiece::const_iterator c,
StringPiece::const_iterator end,
uint32* value);
static bool ParseProbability(StringPiece::const_iterator c,
StringPiece::const_iterator end,
double* probability);
};
} // namespace net
#endif // NET_SPDY_SPDY_ALT_SVC_WIRE_FORMAT_H_
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