mirror of
https://github.com/dmulloy2/ProtocolLib.git
synced 2024-11-23 19:16:14 +01:00
Adding readme.
This commit is contained in:
parent
b299886b62
commit
798d734ba9
139
Readme.md
Normal file
139
Readme.md
Normal file
@ -0,0 +1,139 @@
|
||||
ProtocolLib
|
||||
===========
|
||||
|
||||
Certain tasks are impossible to perform with the standard Bukkit API, and may require
|
||||
working with and even modify Minecraft directly. A common technique is to modify incoming
|
||||
and outgoing [packets](http://www.wiki.vg/Protocol), or inject custom packets into the
|
||||
stream. This is quite cumbersome to do, however, and most implementations will break
|
||||
as soon as a new version of Minecraft has been released. Due to obfuscatio
|
||||
|
||||
Critically, different plugins that use this approach may `hook` into the same classes,
|
||||
with unpredictable outcomes. More than often this causes plugins to crash, but it may also
|
||||
lead to more subtile bugs.
|
||||
|
||||
|
||||
Resources
|
||||
--------
|
||||
|
||||
* [JavaDoc](http://aadnk.github.com/ProtocolLib/Javadoc/)
|
||||
|
||||
|
||||
A new API
|
||||
---------
|
||||
|
||||
'ProtocolLib' attempts to solve this problem by providing a event API, much like Bukkit,
|
||||
that allow plugins to monitor, modify or cancel packets sent and recieved. But more importantly,
|
||||
the API also hides all the gritty, obfusctated classes with a simple index based read/write system.
|
||||
You no longer have to reference CraftBukkit!
|
||||
|
||||
|
||||
Using ProtocolLib
|
||||
-----------------
|
||||
|
||||
To use the library, first add ProtocolLib.jar to your Java build path. Then, add ProtocolLib
|
||||
as a dependency (or soft-dependency, if you can live without it) to your plugin.yml file:
|
||||
|
||||
depends: [ProtocolLib]
|
||||
|
||||
Then get a reference to ProtocolManager in onLoad() and you're good to go.
|
||||
|
||||
private ProtocolManager protocolManager;
|
||||
|
||||
public void onLoad() {
|
||||
|
||||
protocolManager = ProtocolLibrary.getProtocolManager();
|
||||
|
||||
}
|
||||
|
||||
To listen for packets sent by the server to a client, add a server-side listener:
|
||||
|
||||
// Disable all sound effects
|
||||
protocolManager.addPacketListener(
|
||||
new PacketAdapter(this, ConnectionSide.SERVER_SIDE, ListenerPriority.NORMAL, 0x3E) {
|
||||
@Override
|
||||
public void onPacketSending(PacketEvent event) {
|
||||
// Item packets
|
||||
switch (event.getPacketID()) {
|
||||
case 0x3E: // Sound effect
|
||||
event.setCancelled(true);
|
||||
break;
|
||||
}
|
||||
}
|
||||
});
|
||||
|
||||
|
||||
It's also possible to read and modify the content of these packets. For instance, you can create a global
|
||||
censor by listening for Packet3Chat events:
|
||||
|
||||
// Censor
|
||||
protocolManager.addPacketListener(
|
||||
new PacketAdapter(this, ConnectionSide.CLIENT_SIDE, ListenerPriority.NORMAL, 0x03) {
|
||||
@Override
|
||||
public void onPacketReceiving(PacketEvent event) {
|
||||
if (event.getPacketID() == 0x03) {
|
||||
try {
|
||||
PacketContainer packet = event.getPacket();
|
||||
String message = packet.getSpecificModifier(String.class).read(0);
|
||||
|
||||
if (message.contains("shit") || message.contains("damn")) {
|
||||
event.setCancelled(true);
|
||||
event.getPlayer().sendMessage("Bad manners!");
|
||||
}
|
||||
|
||||
} catch (FieldAccessException e) {
|
||||
getLogger().log(Level.SEVERE, "Couldn't access field.", e);
|
||||
}
|
||||
}
|
||||
}
|
||||
});
|
||||
|
||||
|
||||
Sending packets
|
||||
---------------
|
||||
|
||||
Normally, you might have to use someting ugly like the following:
|
||||
|
||||
Packet60Explosion fakeExplosion = new Packet60Explosion();
|
||||
|
||||
fakeExplosion.a = player.getLocation().getX();
|
||||
fakeExplosion.b = player.getLocation().getY();
|
||||
fakeExplosion.c = player.getLocation().getZ();
|
||||
fakeExplosion.d = 3.0F;
|
||||
fakeExplosion.e = new ArrayList<Object>();
|
||||
|
||||
((CraftPlayer) player).getHandle().netServerHandler.sendPacket(fakeExplosion);
|
||||
|
||||
But with ProtocolLib, you can turn that into something more manageable. Notice that
|
||||
you don't have to create an ArrayList this version:
|
||||
|
||||
PacketContainer fakeExplosion = protocolManager.createPacket(60);
|
||||
|
||||
fakeExplosion.getSpecificModifier(double.class).
|
||||
write(0, player.getLocation().getX()).
|
||||
write(1, player.getLocation().getY()).
|
||||
write(2, player.getLocation().getZ());
|
||||
fakeExplosion.getSpecificModifier(float.class).
|
||||
write(0, 3.0F);
|
||||
|
||||
protocolManager.sendServerPacket(player, fakeExplosion);
|
||||
|
||||
|
||||
Compatiblity
|
||||
------------
|
||||
|
||||
One of the main goals of this project was to achive maximum compatibility with craftBukkit. And the end
|
||||
result is quite flexible - in tests I successfully ran an unmodified ProtocolLib on CraftBukkit 1.8.0, and
|
||||
it should be resiliant against future changes. It's likely that I won't have to update ProtocolLib for
|
||||
anything but bug and performance fixes.
|
||||
|
||||
How is this possible? It all comes down to reflection in the end. Essentially, no name is hard coded -
|
||||
every field, method and class is deduced by looking at field types, package names or parameter
|
||||
types. It's remarkably consistent across different versions.
|
||||
|
||||
|
||||
Incompatiblity
|
||||
--------------
|
||||
|
||||
The following plugins (to be expanded) are not compatible with ProtocolLib:
|
||||
|
||||
* TagAPI
|
Loading…
Reference in New Issue
Block a user