--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/3rdparty/vmime/examples/example6_certificateVerifier.hpp	Tue Aug 17 11:19:54 2021 +0200
@@ -0,0 +1,62 @@
+
+
+#if VMIME_HAVE_TLS_SUPPORT
+
+// Certificate verifier (TLS/SSL)
+class interactiveCertificateVerifier : public vmime::security::cert::defaultCertificateVerifier
+{
+public:
+
+	void verify(vmime::shared_ptr <vmime::security::cert::certificateChain> chain, const vmime::string& hostname)
+	{
+		try
+		{
+			setX509TrustedCerts(m_trustedCerts);
+
+			defaultCertificateVerifier::verify(chain, hostname);
+		}
+		catch (vmime::security::cert::certificateException&)
+		{
+			// Obtain subject's certificate
+			vmime::shared_ptr <vmime::security::cert::certificate> cert = chain->getAt(0);
+
+			std::cout << std::endl;
+			std::cout << "Server sent a '" << cert->getType() << "'" << " certificate." << std::endl;
+			std::cout << "Do you want to accept this certificate? (Y/n) ";
+			std::cout.flush();
+
+			std::string answer;
+			std::getline(std::cin, answer);
+
+			if (answer.length() != 0 &&
+			    (answer[0] == 'Y' || answer[0] == 'y'))
+			{
+				// Accept it, and remember user's choice for later
+				if (cert->getType() == "X.509")
+				{
+					m_trustedCerts.push_back(vmime::dynamicCast
+						<vmime::security::cert::X509Certificate>(cert));
+
+					setX509TrustedCerts(m_trustedCerts);
+					defaultCertificateVerifier::verify(chain, hostname);
+				}
+
+				return;
+			}
+
+			throw vmime::security::cert::certificateException
+				("User did not accept the certificate.");
+		}
+	}
+
+private:
+
+	static std::vector <vmime::shared_ptr <vmime::security::cert::X509Certificate> > m_trustedCerts;
+};
+
+
+std::vector <vmime::shared_ptr <vmime::security::cert::X509Certificate> >
+	interactiveCertificateVerifier::m_trustedCerts;
+
+#endif // VMIME_HAVE_TLS_SUPPORT
+