WIP: support configurable certificates/keys, and root trust CAs (#114)

* wip: tls options implemented in openssl

* update naming, remove #define guard

* assert compiled with USE_TLS for tls options

* apply autoformatter

* include tls options impl

* style cleanup; auto ssl_err

* ssl_err -> sslErr

* be explicit about SSL_VERIFY_NONE

ixwebsocket/IXSocketTLSOptions.cpp

@@ -0,0 +1,34 @@
+/*
+ *  IXSocketTLSOptions.h
+ *  Author: Benjamin Sergeant
+ *  Copyright (c) 2017-2018 Machine Zone, Inc. All rights reserved.
+ */
+
+#include <assert.h>
+#include "IXSocketTLSOptions.h"
+
+namespace ix
+{
+
+    SocketTLSOptions::SocketTLSOptions() {
+#ifndef IXWEBSOCKET_USE_TLS
+        assert(false && "To use TLS features the library must be compiled with USE_TLS");
+#endif 
+    }
+
+    bool SocketTLSOptions::isUsingClientCert() const
+    {
+        return !certFile.empty() && !keyFile.empty();
+    }
+
+    bool SocketTLSOptions::isUsingSystemDefaults() const
+    {
+        return caFile == "SYSTEM";
+    }
+
+    bool SocketTLSOptions::isPeerVerifyDisabled() const
+    {
+        return caFile != "NONE";
+    }
+
+} // namespace ix