From 071e114ffa945522a7a9acc3259427166992d5ee Mon Sep 17 00:00:00 2001
From: sfan5 <sfan5@live.de>
Date: Wed, 10 May 2017 15:29:21 +0200
Subject: Private nodemeta (#5702)

* Private node metadata that isn't sent to the client
---
 src/nodemetadata.cpp | 63 ++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 49 insertions(+), 14 deletions(-)

(limited to 'src/nodemetadata.cpp')

diff --git a/src/nodemetadata.cpp b/src/nodemetadata.cpp
index 9b60cf33e..0e8195c34 100644
--- a/src/nodemetadata.cpp
+++ b/src/nodemetadata.cpp
@@ -23,6 +23,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "inventory.h"
 #include "log.h"
 #include "util/serialize.h"
+#include "util/basic_macros.h"
 #include "constants.h" // MAP_BLOCKSIZE
 #include <sstream>
 
@@ -39,28 +40,38 @@ NodeMetadata::~NodeMetadata()
 	delete m_inventory;
 }
 
-void NodeMetadata::serialize(std::ostream &os) const
+void NodeMetadata::serialize(std::ostream &os, u8 version, bool disk) const
 {
-	int num_vars = m_stringvars.size();
+	int num_vars = disk ? m_stringvars.size() : countNonPrivate();
 	writeU32(os, num_vars);
 	for (StringMap::const_iterator
 			it = m_stringvars.begin();
 			it != m_stringvars.end(); ++it) {
+		bool priv = isPrivate(it->first);
+		if (!disk && priv)
+			continue;
+
 		os << serializeString(it->first);
 		os << serializeLongString(it->second);
+		if (version >= 2)
+			writeU8(os, (priv) ? 1 : 0);
 	}
 
 	m_inventory->serialize(os);
 }
 
-void NodeMetadata::deSerialize(std::istream &is)
+void NodeMetadata::deSerialize(std::istream &is, u8 version)
 {
-	m_stringvars.clear();
+	clear();
 	int num_vars = readU32(is);
 	for(int i=0; i<num_vars; i++){
 		std::string name = deSerializeString(is);
 		std::string var = deSerializeLongString(is);
 		m_stringvars[name] = var;
+		if (version >= 2) {
+			if (readU8(is) == 1)
+				markPrivate(name, true);
+		}
 	}
 
 	m_inventory->deSerialize(is);
@@ -69,6 +80,7 @@ void NodeMetadata::deSerialize(std::istream &is)
 void NodeMetadata::clear()
 {
 	Metadata::clear();
+	m_privatevars.clear();
 	m_inventory->clear();
 }
 
@@ -77,11 +89,34 @@ bool NodeMetadata::empty() const
 	return Metadata::empty() && m_inventory->getLists().size() == 0;
 }
 
+
+void NodeMetadata::markPrivate(const std::string &name, bool set)
+{
+	if (set)
+		m_privatevars.insert(name);
+	else
+		m_privatevars.erase(name);
+}
+
+int NodeMetadata::countNonPrivate() const
+{
+	// m_privatevars can contain names not actually present
+	// DON'T: return m_stringvars.size() - m_privatevars.size();
+	int n = 0;
+	for (StringMap::const_iterator
+			it = m_stringvars.begin();
+			it != m_stringvars.end(); ++it) {
+		if (isPrivate(it->first) == false)
+			n++;
+	}
+	return n;
+}
+
 /*
 	NodeMetadataList
 */
 
-void NodeMetadataList::serialize(std::ostream &os) const
+void NodeMetadataList::serialize(std::ostream &os, u8 blockver, bool disk) const
 {
 	/*
 		Version 0 is a placeholder for "nothing to see here; go away."
@@ -93,7 +128,8 @@ void NodeMetadataList::serialize(std::ostream &os) const
 		return;
 	}
 
-	writeU8(os, 1); // version
+	u8 version = (blockver > 27) ? 2 : 1;
+	writeU8(os, version);
 	writeU16(os, count);
 
 	for(std::map<v3s16, NodeMetadata*>::const_iterator
@@ -108,7 +144,7 @@ void NodeMetadataList::serialize(std::ostream &os) const
 		u16 p16 = p.Z * MAP_BLOCKSIZE * MAP_BLOCKSIZE + p.Y * MAP_BLOCKSIZE + p.X;
 		writeU16(os, p16);
 
-		data->serialize(os);
+		data->serialize(os, version, disk);
 	}
 }
 
@@ -123,7 +159,7 @@ void NodeMetadataList::deSerialize(std::istream &is, IItemDefManager *item_def_m
 		return;
 	}
 
-	if (version != 1) {
+	if (version > 2) {
 		std::string err_str = std::string(FUNCTION_NAME)
 			+ ": version " + itos(version) + " not supported";
 		infostream << err_str << std::endl;
@@ -132,7 +168,7 @@ void NodeMetadataList::deSerialize(std::istream &is, IItemDefManager *item_def_m
 
 	u16 count = readU16(is);
 
-	for (u16 i=0; i < count; i++) {
+	for (u16 i = 0; i < count; i++) {
 		u16 p16 = readU16(is);
 
 		v3s16 p;
@@ -143,15 +179,14 @@ void NodeMetadataList::deSerialize(std::istream &is, IItemDefManager *item_def_m
 		p.X = p16;
 
 		if (m_data.find(p) != m_data.end()) {
-			warningstream<<"NodeMetadataList::deSerialize(): "
-					<<"already set data at position"
-					<<"("<<p.X<<","<<p.Y<<","<<p.Z<<"): Ignoring."
-					<<std::endl;
+			warningstream << "NodeMetadataList::deSerialize(): "
+					<< "already set data at position " << PP(p)
+					<< ": Ignoring." << std::endl;
 			continue;
 		}
 
 		NodeMetadata *data = new NodeMetadata(item_def_mgr);
-		data->deSerialize(is);
+		data->deSerialize(is, version);
 		m_data[p] = data;
 	}
 }
-- 
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