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// Copyright 2012 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_HTTP_HTTP_VARY_DATA_H_
#define NET_HTTP_HTTP_VARY_DATA_H_
#include <array>
#include <string_view>
#include "crypto/obsolete/md5.h"
#include "net/base/net_export.h"
namespace base {
class Pickle;
class PickleIterator;
}
namespace net {
struct HttpRequestInfo;
class HttpResponseHeaders;
// Used to implement the HTTP/1.1 Vary header. This class contains a MD5 hash
// over the request headers indicated by a Vary header.
//
// While RFC 2616 requires strict request header comparisons, it is much
// cheaper to store a MD5 sum, which should be sufficient. Storing a hash also
// avoids messy privacy issues as some of the request headers could hold
// sensitive data (e.g., cookies).
//
// NOTE: This class does not hold onto the contents of the Vary header.
// Instead, it relies on the consumer to store that and to supply it again to
// the MatchesRequest function for comparing against future HTTP requests.
//
class NET_EXPORT_PRIVATE HttpVaryData {
public:
HttpVaryData();
bool is_valid() const { return is_valid_; }
// Initialize from a request and its corresponding response headers.
//
// Returns true if a Vary header was found in the response headers and that
// Vary header was not empty. Upon success, the object is also marked as valid
// such that is_valid() will return true. Otherwise, false is returned to
// indicate that this object is marked as invalid.
//
bool Init(const HttpRequestInfo& request_info,
const HttpResponseHeaders& response_headers);
// Initialize from a pickle that contains data generated by a call to the
// vary data's Persist method.
//
// Upon success, true is returned and the object is marked as valid such that
// is_valid() will return true. Otherwise, false is returned to indicate
// that this object is marked as invalid.
//
bool InitFromPickle(base::PickleIterator* pickle_iter);
// Call this method to persist the vary data. Illegal to call this on an
// invalid object.
void Persist(base::Pickle* pickle) const;
// Call this method to test if the given request matches the previous request
// with which this vary data corresponds. The |cached_response_headers| must
// be the same response headers used to generate this vary data.
bool MatchesRequest(const HttpRequestInfo& request_info,
const HttpResponseHeaders& cached_response_headers) const;
private:
// Append to the MD5 context for the given request header.
static void AddField(const HttpRequestInfo& request_info,
std::string_view request_header,
crypto::obsolete::Md5& context);
// A digested version of the request headers corresponding to the Vary header.
std::array<uint8_t, crypto::obsolete::Md5::kSize> request_digest_;
// True when request_digest_ contains meaningful data.
bool is_valid_ = false;
};
} // namespace net
#endif // NET_HTTP_HTTP_VARY_DATA_H_
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