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package net.labymod.serverapi; |
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import com.google.gson.JsonObject; |
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import io.netty.buffer.ByteBuf; |
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import io.netty.buffer.Unpooled; |
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import io.netty.handler.codec.DecoderException; |
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import io.netty.handler.codec.EncoderException; |
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import java.nio.charset.Charset; |
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import java.util.Map; |
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/** |
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* Class created by qlow | Jan |
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*/ |
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public class LabyModAPI { |
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/** |
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* Gets the bytes we should send to a player to update the permissions |
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* |
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* @param permissions a map containing the permissions |
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* @return the byte array that should be the payload |
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*/ |
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public byte[] getBytesToSend( Map<Permission, Boolean> permissions ) { |
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// Creating a json object we will put the permissions in |
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JsonObject object = new JsonObject(); |
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// Adding the permissions to the json object |
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for ( Map.Entry<Permission, Boolean> permissionEntry : permissions.entrySet() ) { |
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object.addProperty( permissionEntry.getKey().name(), permissionEntry.getValue() ); |
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} |
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// Returning the byte array |
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return getBytesToSend( "PERMISSIONS", object.toString() ); |
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} |
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/** |
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* Gets the bytes that are required to send the given message |
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* |
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* @param messageKey the message's key |
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* @param messageContents the message's contents |
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* @return the byte array that should be the payload |
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*/ |
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public byte[] getBytesToSend( String messageKey, String messageContents ) { |
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// Getting an empty buffer |
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ByteBuf byteBuf = Unpooled.buffer(); |
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// Writing the message-key to the buffer |
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writeString( byteBuf, messageKey ); |
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// Writing the contents to the buffer |
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writeString( byteBuf, messageContents ); |
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// Copying the buffer's bytes to the byte array |
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byte[] bytes = new byte[byteBuf.readableBytes()]; |
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byteBuf.readBytes( bytes ); |
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// Returning the byte array |
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return bytes; |
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} |
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/** |
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* Writes a varint to the given byte buffer |
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* |
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* @param buf the byte buffer the int should be written to |
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* @param input the int that should be written to the buffer |
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*/ |
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private void writeVarIntToBuffer( ByteBuf buf, int input ) { |
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while ( (input & -128) != 0 ) { |
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buf.writeByte( input & 127 | 128 ); |
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input >>>= 7; |
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} |
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buf.writeByte( input ); |
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} |
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/** |
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* Writes a string to the given byte buffer |
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* |
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* @param buf the byte buffer the string should be written to |
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* @param string the string that should be written to the buffer |
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*/ |
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private void writeString( ByteBuf buf, String string ) { |
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byte[] abyte = string.getBytes( Charset.forName( "UTF-8" ) ); |
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if ( abyte.length > Short.MAX_VALUE ) { |
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throw new EncoderException( "String too big (was " + string.length() + " bytes encoded, max " + Short.MAX_VALUE + ")" ); |
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} else { |
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writeVarIntToBuffer( buf, abyte.length ); |
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buf.writeBytes( abyte ); |
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} |
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} |
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/** |
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* Reads a varint from the given byte buffer |
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* |
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* @param buf the byte buffer the varint should be read from |
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* @return the int read |
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*/ |
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public int readVarIntFromBuffer( ByteBuf buf ) { |
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int i = 0; |
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int j = 0; |
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byte b0; |
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do { |
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b0 = buf.readByte(); |
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i |= (b0 & 127) << j++ * 7; |
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if ( j > 5 ) { |
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throw new RuntimeException( "VarInt too big" ); |
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} |
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} while ( (b0 & 128) == 128 ); |
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return i; |
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} |
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/** |
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* Reads a string from the given byte buffer |
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* |
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* @param buf the byte buffer the string should be read from |
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* @param maxLength the string's max-length |
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* @return the string read |
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*/ |
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public String readString( ByteBuf buf, int maxLength ) { |
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int i = this.readVarIntFromBuffer( buf ); |
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if ( i > maxLength * 4 ) { |
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throw new DecoderException( "The received encoded string buffer length is longer than maximum allowed (" + i + " > " + maxLength * 4 + ")" ); |
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} else if ( i < 0 ) { |
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throw new DecoderException( "The received encoded string buffer length is less than zero! Weird string!" ); |
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} else { |
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byte[] bytes = new byte[i]; |
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buf.readBytes( bytes ); |
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String s = new String( bytes, Charset.forName( "UTF-8" ) ); |
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if ( s.length() > maxLength ) { |
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throw new DecoderException( "The received string length is longer than maximum allowed (" + i + " > " + maxLength + ")" ); |
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} else { |
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return s; |
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} |
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} |
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} |
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} |
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LabyMod /
labymod-server-api
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