package com.planet_ink.coffee_mud.Libraries;
import java.nio.ByteBuffer;
import java.util.zip.Deflater;
import java.util.zip.Inflater;
import com.planet_ink.coffee_mud.Libraries.interfaces.TextEncoders;
import com.planet_ink.coffee_mud.core.B64Encoder;
import com.planet_ink.coffee_mud.core.CMLib;
import com.planet_ink.coffee_mud.core.CMProps;
import com.planet_ink.coffee_mud.core.CMath;
import com.planet_ink.coffee_mud.core.Log;
/*
Copyright 2005-2016 Bo Zimmerman
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
public class CMEncoder extends StdLibrary implements TextEncoders
{
@Override
public String ID()
{
return "CMEncoder";
}
private byte[] encodeBuffer = new byte[65536];
private final Deflater compresser = new Deflater(Deflater.BEST_COMPRESSION);
private final Inflater decompresser = new Inflater();
public CMEncoder()
{
super();
}
@Override
public synchronized String decompressString(byte[] b)
{
try
{
if ((b == null)||(b.length==0)) return "";
decompresser.reset();
decompresser.setInput(b);
synchronized (encodeBuffer)
{
final int len = decompresser.inflate(encodeBuffer);
return new String(encodeBuffer, 0, len, CMProps.getVar(CMProps.Str.CHARSETINPUT));
}
}
catch (final Exception ex)
{
Log.errOut(Thread.currentThread().getName(), "Error occurred during decompression: "+ex.getMessage());
encodeBuffer=new byte[65536];
return "";
}
}
@Override
public synchronized byte[] compressString(String s)
{
byte[] result = null;
try
{
compresser.reset();
compresser.setInput(s.getBytes(CMProps.getVar(CMProps.Str.CHARSETINPUT)));
compresser.finish();
synchronized (encodeBuffer)
{
if(s.length()>encodeBuffer.length)
encodeBuffer=new byte[s.length()];
encodeBuffer[0]=0;
final int len = compresser.deflate(encodeBuffer);
result = new byte[len];
System.arraycopy(encodeBuffer, 0, result, 0, len);
}
}
catch (final Exception ex)
{
Log.errOut("MUD", "Error occurred during compression: "+ex.getMessage());
encodeBuffer=new byte[65536];
}
return result;
}
@Override
public String makeRandomHashString(final String password)
{
final int salt=(int)Math.round(CMath.random() * Integer.MAX_VALUE);
final int passHash=(password+salt).toLowerCase().hashCode();
return "|"+B64Encoder.B64encodeBytes(ByteBuffer.allocate(4).putInt(salt).array())
+"|"+B64Encoder.B64encodeBytes(ByteBuffer.allocate(4).putInt(passHash).array());
}
@Override
public boolean isARandomHashString(final String password)
{
return ((password.length()>2) && (password.startsWith("|")) && (password.indexOf('|',1)>1));
}
@Override
public boolean checkPasswordAgainstRandomHashString(final String passwordString, final String hashString)
{
final int hashDex=hashString.indexOf('|',1);
final int salt=ByteBuffer.wrap(B64Encoder.B64decode(hashString.substring(1,hashDex))).getInt();
final int hash=ByteBuffer.wrap(B64Encoder.B64decode(hashString.substring(hashDex+1))).getInt();
return hash==(passwordString+salt).toLowerCase().hashCode();
}
@Override
public boolean checkHashStringPairs(final String hashString1, final String hashString2)
{
final int hashDex1=hashString1.indexOf('|',1);
final int salt1=ByteBuffer.wrap(B64Encoder.B64decode(hashString1.substring(1,hashDex1))).getInt();
final int hash1=ByteBuffer.wrap(B64Encoder.B64decode(hashString1.substring(hashDex1+1))).getInt();
final int hashDex2=hashString2.indexOf('|',1);
final int salt2=ByteBuffer.wrap(B64Encoder.B64decode(hashString2.substring(1,hashDex2))).getInt();
final int hash2=ByteBuffer.wrap(B64Encoder.B64decode(hashString2.substring(hashDex2+1))).getInt();
return (hash1==(hashString2+salt1).toLowerCase().hashCode()) || (hash2==(hashString1+salt2).toLowerCase().hashCode());
}
@Override
public String generateRandomPassword()
{
final StringBuilder str=new StringBuilder("");
for(int i=0;i<10;i++)
{
if((i%2)==0)
str.append(CMLib.dice().roll(1, 10, -1));
else
str.append((char)('a'+CMLib.dice().roll(1, 26, -1)));
}
return str.toString();
}
@Override
public boolean passwordCheck(String pass1, String pass2)
{
if(pass1 == null)
{
return (pass2==null);
}
else
if(pass2 == null)
return false;
if(pass1.equalsIgnoreCase(pass2))
return true;
if(CMLib.encoder().isARandomHashString(pass2))
{
if(CMLib.encoder().isARandomHashString(pass1))
return checkHashStringPairs(pass1,pass2);
else
return CMLib.encoder().checkPasswordAgainstRandomHashString(pass1, pass2);
}
else
{
if(CMLib.encoder().isARandomHashString(pass1))
return CMLib.encoder().checkPasswordAgainstRandomHashString(pass2, pass1);
return pass1.equalsIgnoreCase(pass2);
}
}
}
