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// Copyright (c) 2012 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.
#include "net/cert/x509_util.h"
#include "base/time.h"
#include "net/cert/x509_certificate.h"
namespace net {
namespace x509_util {
ClientCertSorter::ClientCertSorter() : now_(base::Time::Now()) {}
bool ClientCertSorter::operator()(
const scoped_refptr<X509Certificate>& a,
const scoped_refptr<X509Certificate>& b) const {
// Certificates that are null are sorted last.
if (!a.get() || !b.get())
return a.get() && !b.get();
// Certificates that are expired/not-yet-valid are sorted last.
bool a_is_valid = now_ >= a->valid_start() && now_ <= a->valid_expiry();
bool b_is_valid = now_ >= b->valid_start() && now_ <= b->valid_expiry();
if (a_is_valid != b_is_valid)
return a_is_valid && !b_is_valid;
// Certificates with longer expirations appear as higher priority (less
// than) certificates with shorter expirations.
if (a->valid_expiry() != b->valid_expiry())
return a->valid_expiry() > b->valid_expiry();
// If the expiration dates are equivalent, certificates that were issued
// more recently should be prioritized over older certificates.
if (a->valid_start() != b->valid_start())
return a->valid_start() > b->valid_start();
// Otherwise, prefer client certificates with shorter chains.
const X509Certificate::OSCertHandles& a_intermediates =
a->GetIntermediateCertificates();
const X509Certificate::OSCertHandles& b_intermediates =
b->GetIntermediateCertificates();
return a_intermediates.size() < b_intermediates.size();
}
} // namespace x509_util
} // namespace net
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