Certificate Transparency: Start tracking logs' state

net/cert/ct_verifier.h

 // Copyright 2013 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.
 
 #ifndef NET_CERT_CT_VERIFIER_H_
 #define NET_CERT_CT_VERIFIER_H_
 
 #include <string>
 
 #include "net/base/net_export.h"
@@ skipping 17 matching lines @@
    public:
     // Called for each Signed Certificate Timestamp from a known log that vas
     // verified successfully (i.e. the signature verifies). |sct| is the
     // Signed Certificate Timestamp, |cert| is the certificate it applies to.
     // The certificate is needed to calculate the hash of the log entry,
     // necessary for checking inclusion in the log.
     // Note: The observer (whose implementation is expected to exist outside
     // net/) may store the observed |cert| and |sct|.
     virtual void OnSCTVerified(X509Certificate* cert,
                                const ct::SignedCertificateTimestamp* sct) = 0;
+
+   protected:
+    virtual ~Observer() {}
   };
 
   virtual ~CTVerifier() {}
 
   // Verifies SCTs embedded in the certificate itself, SCTs embedded in a
   // stapled OCSP response, and SCTs obtained via the
   // signed_certificate_timestamp TLS extension on the given |cert|.
   // A certificate is permitted but not required to use multiple sources for
   // SCTs. It is expected that most certificates will use only one source
   // (embedding, TLS extension or OCSP stapling). If no stapled OCSP response
@@ skipping 10 matching lines @@
   // Registers |observer| to receive notifications of validated SCTs. Does not
   // take ownership of the observer as the observer may be performing
   // URLRequests which have to be cancelled before this object is destroyed.
   // Setting |observer| to nullptr has the effect of stopping all notifications.
   virtual void SetObserver(Observer* observer) = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_CERT_CT_VERIFIER_H_