Make it compatible with Node 10.0 - 10.7

.travis.yml

@@ -6,6 +6,7 @@ node_js:
   - 12
   - 11
   - 10
+  - 10.0
 
 os:
   - linux

binding.gyp

@@ -9,6 +9,9 @@
         ],
         "include_dirs": [
             "<!@(node -p \"require('node-addon-api').include\")",
+            # Backport of https://github.com/nodejs/node-gyp/pull/1055
+            "<(node_root_dir)/deps/openssl/config",
+            "<(node_root_dir)/deps/openssl/openssl/include",
         ],
         "dependencies": [
             "<!(node -p \"require('node-addon-api').gyp\")"

src/unwrap_ssl.cpp

@@ -10,7 +10,13 @@ using v8::Object;
 using v8::Isolate;
 
 class TLSWrap2 : public node::TLSWrap {
-    public: SSL* get_ssl(){ return ssl_.get(); }
+    public: SSL* get_ssl(){
+#if NODE_VERSION_AT_LEAST(10,8,0)
+        return ssl_.get();
+#else
+        return ssl_;
+#endif
+    }
 };
 
 static std::string v8_local_obj_ctor(Local<Object> obj) {
@@ -32,5 +38,5 @@ SSL* unwrap_ssl(napi_env env, Napi::Object socket) {
     Local<Object> wrap_v8 = v8_local_obj_from_napi_value(wrap_js);
     if (v8_local_obj_ctor(wrap_v8)!="TLSWrap")
         throw Napi::TypeError::New(env, "'_handle' property is not TLSWrap");
-    return TLSWrap2::FromJSObject<TLSWrap2>(wrap_v8)->get_ssl();
+    return node::Unwrap<TLSWrap2>(wrap_v8)->get_ssl();
 }