support new ISteamUser API argument in Steam SDK 1.57

docs/user.rst

@@ -50,6 +50,7 @@ Function Reference
 
 .. function:: user.getAuthSessionTicket ()
 
+    :param string identityRemote: String representing the remote system that will authenticate the ticket.
     :returns: (`data`) A result table if successful, otherwise nil
 
 		* **data.ticket** (`number`) The handle for the auth session ticket (only has meaning on the client on where you called this, is NOT an auth ticket)
@@ -72,10 +73,6 @@ Function Reference
        -- Now do something with it
     end
 
-.. warning::
-
-    This function does not return a `SteamNetworkingIdentity` object. If this is needed, it needs to be implemented on the luasteam side.
-
 .. function:: user.cancelAuthTicket ()
 
     :param number ticketHandle: The ticket handle to cancel the auth ticket for. You need to call this once you are done using a requested or scheduled ticket. Make sure to call this for any open ticket handles when quitting your application.

src/user.cpp

@@ -65,14 +65,16 @@ EXTERN int luasteam_getSteamID(lua_State *L) {
     return 1;
 }
 
-// HAuthTicket GetAuthSessionTicket( void *pTicket, int cbMaxTicket, uint32 *pcbTicket );
+// HAuthTicket GetAuthSessionTicket( void *pTicket, int cbMaxTicket, uint32 *pcbTicket, const SteamNetworkingIdentity *pIdentityRemote );
 EXTERN int luasteam_getAuthSessionTicket(lua_State *L) {
     uint32 pcbTicket = 0;
     void *pTicket = malloc(1024);
-    // For now we're not returning this.
-    SteamNetworkingIdentity id;
+    SteamNetworkingIdentity *identityRemote = new SteamNetworkingIdentity();
+    identityRemote->ParseString(luaL_checkstring(L, 1));
+    HAuthTicket ticket = SteamUser()->GetAuthSessionTicket(pTicket, 1024, &pcbTicket, identityRemote);
 
-    HAuthTicket ticket = SteamUser()->GetAuthSessionTicket(pTicket, 1024, &pcbTicket, &id);
+    identityRemote->Clear();
+    free(identityRemote);
 
     if (ticket != k_HAuthTicketInvalid) {
         std::string hexTicket = bufferToHex(pTicket, pcbTicket);
@@ -84,7 +86,6 @@ EXTERN int luasteam_getAuthSessionTicket(lua_State *L) {
         free(pTicket);
         return 1;
     }
-
     free(pTicket);
     lua_pushnil(L);
     return 1;