MojangAPI: Implemented UUID shortening and dashing.

src/ClientHandle.cpp

@@ -233,13 +233,14 @@ AString cClientHandle::GenerateOfflineUUID(const AString & a_Username)
 	// This guarantees that they will never collide with an online UUID and can be distinguished.
 	// Proper format for a version 3 UUID is:
 	// xxxxxxxx-xxxx-3xxx-yxxx-xxxxxxxxxxxx where x is any hexadecimal digit and y is one of 8, 9, A, or B
+	// Note that we generate a short UUID (without the dashes)
 	
 	// Generate an md5 checksum, and use it as base for the ID:
 	unsigned char MD5[16];
 	md5((const unsigned char *)a_Username.c_str(), a_Username.length(), MD5);
 	MD5[6] &= 0x0f;  // Need to trim to 4 bits only...
 	MD5[8] &= 0x0f;  // ... otherwise %01x overflows into two chars
-	return Printf("%02x%02x%02x%02x-%02x%02x-3%01x%02x-8%01x%02x-%02x%02x%02x%02x%02x%02x",
+	return Printf("%02x%02x%02x%02x%02x%02x3%01x%02x8%01x%02x%02x%02x%02x%02x%02x%02x",
 		MD5[0],  MD5[1],  MD5[2],  MD5[3],
 		MD5[4],  MD5[5],  MD5[6],  MD5[7],
 		MD5[8],  MD5[9],  MD5[10], MD5[11],

src/ClientHandle.h

@@ -66,7 +66,9 @@ public:
 	
 	cPlayer * GetPlayer(void) { return m_Player; }  // tolua_export
 
+	/** Returns the player's UUID, as used by the protocol, in the short form (no dashes) */
 	const AString & GetUUID(void) const { return m_UUID; }  // tolua_export
+	
 	void SetUUID(const AString & a_UUID) { m_UUID = a_UUID; }
 
 	const Json::Value & GetProperties(void) const { return m_Properties; }
@@ -80,7 +82,7 @@ public:
 	/** Generates an UUID based on the player name provided.
 	This is used for the offline (non-auth) mode, when there's no UUID source.
 	Each username generates a unique and constant UUID, so that when the player reconnects with the same name, their UUID is the same.
-	Returns a 36-char UUID (with dashes). */
+	Returns a 32-char UUID (no dashes). */
 	static AString GenerateOfflineUUID(const AString & a_Username);  // tolua_export
 	
 	/** Returns true if the UUID is generated by online auth, false if it is an offline-generated UUID.
@@ -360,7 +362,11 @@ private:
 	int m_NumBlockChangeInteractionsThisTick;
 	
 	static int s_ClientCount;
+	
+	/** ID used for identification during authenticating. Assigned sequentially for each new instance. */
 	int m_UniqueID;
+	
+	/** Contains the UUID used by Mojang to identify the player's account. Short UUID stored here (without dashes) */
 	AString m_UUID;
 	
 	/** Set to true when the chunk where the player is is sent to the client. Used for spawning the player */

src/Protocol/Authenticator.cpp

@@ -188,21 +188,12 @@ bool cAuthenticator::AuthWithYggdrasil(AString & a_UserName, const AString & a_S
 		return false;
 	}
 	a_UserName = root.get("name", "Unknown").asString();
-	a_UUID = root.get("id", "").asString();
+	a_UUID = cMojangAPI::MakeUUIDShort(root.get("id", "").asString());
 	a_Properties = root["properties"];
 	
 	// Store the player's UUID in the NameToUUID map in MojangAPI:
 	cRoot::Get()->GetMojangAPI().AddPlayerNameToUUIDMapping(a_UserName, a_UUID);
 
-	// If the UUID doesn't contain the dashes, insert them at the proper places:
-	if (a_UUID.size() == 32)
-	{
-		a_UUID.insert(8, "-");
-		a_UUID.insert(13, "-");
-		a_UUID.insert(18, "-");
-		a_UUID.insert(23, "-");
-	}
-
 	return true;
 }
 

src/Protocol/MojangAPI.cpp

@@ -18,6 +18,9 @@
 /** The maximum age for items to be kept in the cache. Any item older than this will be removed. */
 const Int64 MAX_AGE = 7 * 24 * 60 * 60;  // 7 days ago
 
+/** The maximum number of names to send in a single query */
+const int MAX_PER_QUERY = 100;
+
 
 
 
@@ -29,6 +32,7 @@ const Int64 MAX_AGE = 7 * 24 * 60 * 60;  // 7 days ago
 
 
 
+
 /** This is the data of the root certs for Starfield Technologies, the CA that signed sessionserver.mojang.com's cert:
 Downloaded from http://certs.starfieldtech.com/repository/ */
 static const AString & StarfieldCACert(void)
@@ -161,9 +165,10 @@ AStringVector cMojangAPI::GetUUIDsFromPlayerNames(const AStringVector & a_Player
 void cMojangAPI::AddPlayerNameToUUIDMapping(const AString & a_PlayerName, const AString & a_UUID)
 {
 	AString lcName(a_PlayerName);
+	AString UUID = MakeUUIDShort(a_UUID);
 	Int64 Now = time(NULL);
 	cCSLock Lock(m_CSNameToUUID);
-	m_NameToUUID[StrToLower(lcName)] = sUUIDRecord(a_PlayerName, a_UUID, Now);
+	m_NameToUUID[StrToLower(lcName)] = sUUIDRecord(a_PlayerName, UUID, Now);
 }
 
 
@@ -234,8 +239,14 @@ AString cMojangAPI::MakeUUIDShort(const AString & a_UUID)
 		
 		case 36: 
 		{
+			// Remove the dashes from the string:
 			AString res;
-			// TODO
+			res.reserve(32);
+			res.append(a_UUID, 0, 8);
+			res.append(a_UUID, 9, 4);
+			res.append(a_UUID, 14, 4);
+			res.append(a_UUID, 19, 4);
+			res.append(a_UUID, 24, 12);
 			return res;
 		}
 	}
@@ -256,7 +267,16 @@ AString cMojangAPI::MakeUUIDDashed(const AString & a_UUID)
 		case 32: 
 		{
 			AString res;
-			// TODO
+			res.reserve(36);
+			res.append(a_UUID, 0, 8);
+			res.push_back('-');
+			res.append(a_UUID, 8, 4);
+			res.push_back('-');
+			res.append(a_UUID, 12, 4);
+			res.push_back('-');
+			res.append(a_UUID, 16, 4);
+			res.push_back('-');
+			res.append(a_UUID, 20, 12);
 			return res;
 		}
 	}
@@ -362,11 +382,11 @@ void cMojangAPI::CacheNamesToUUIDs(const AStringVector & a_PlayerNames)
 	
 	while (!NamesToQuery.empty())
 	{
-		// Create the request body - a JSON containing up to 100 playernames:
+		// Create the request body - a JSON containing up to MAX_PER_QUERY playernames:
 		Json::Value root;
 		int Count = 0;
 		AStringVector::iterator itr = NamesToQuery.begin(), end = NamesToQuery.end();
-		for (; (itr != end) && (Count < 100); ++itr, ++Count)
+		for (; (itr != end) && (Count < MAX_PER_QUERY); ++itr, ++Count)
 		{
 			Json::Value req(*itr);
 			root.append(req);
@@ -377,7 +397,7 @@ void cMojangAPI::CacheNamesToUUIDs(const AStringVector & a_PlayerNames)
 	
 		// Create the HTTP request:
 		AString Request;
-		Request += "POST " + m_NameToUUIDAddress + " HTTP/1.0\r\n";
+		Request += "POST " + m_NameToUUIDAddress + " HTTP/1.0\r\n";  // We need to use HTTP 1.0 because we don't handle Chunked transfer encoding
 		Request += "Host: " + m_NameToUUIDServer + "\r\n";
 		Request += "User-Agent: MCServer\r\n";
 		Request += "Connection: close\r\n";
@@ -430,7 +450,7 @@ void cMojangAPI::CacheNamesToUUIDs(const AStringVector & a_PlayerNames)
 		{
 			Json::Value & Val = root[idx];
 			AString JsonName = Val.get("name", "").asString();
-			AString JsonUUID = Val.get("id", "").asString();
+			AString JsonUUID = MakeUUIDShort(Val.get("id", "").asString());
 			if (JsonUUID.empty())
 			{
 				continue;

src/Protocol/Protocol17x.cpp

@@ -680,7 +680,7 @@ void cProtocol172::SendLoginSuccess(void)
 	
 	{
 		cPacketizer Pkt(*this, 0x02);  // Login success packet
-		Pkt.WriteString(m_Client->GetUUID());
+		Pkt.WriteString(cMojangAPI::MakeUUIDDashed(m_Client->GetUUID()));
 		Pkt.WriteString(m_Client->GetUsername());
 	}
 
@@ -941,7 +941,7 @@ void cProtocol172::SendPlayerSpawn(const cPlayer & a_Player)
 	// Called to spawn another player for the client
 	cPacketizer Pkt(*this, 0x0c);  // Spawn Player packet
 	Pkt.WriteVarInt(a_Player.GetUniqueID());
-	Pkt.WriteString(a_Player.GetClientHandle()->GetUUID());
+	Pkt.WriteString(cMojangAPI::MakeUUIDDashed(a_Player.GetClientHandle()->GetUUID()));
 	Pkt.WriteString(a_Player.GetName());
 	Pkt.WriteFPInt(a_Player.GetPosX());
 	Pkt.WriteFPInt(a_Player.GetPosY());
@@ -3014,7 +3014,7 @@ void cProtocol176::SendPlayerSpawn(const cPlayer & a_Player)
 	// Called to spawn another player for the client
 	cPacketizer Pkt(*this, 0x0c);  // Spawn Player packet
 	Pkt.WriteVarInt(a_Player.GetUniqueID());
-	Pkt.WriteString(a_Player.GetClientHandle()->GetUUID());
+	Pkt.WriteString(cMojangAPI::MakeUUIDDashed(a_Player.GetClientHandle()->GetUUID()));
 	Pkt.WriteString(a_Player.GetName());
 
 	const Json::Value & Properties = m_Client->GetProperties();