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Added extension development instructions
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Eduardo Alonso
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Extensions.md
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199
Extensions.md
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G-Earth supports console & GUI extensions, this page is focused on extension structure and development.
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## Features
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* Packet hash/name support
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* Interception of incoming/outgoing packets
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* Full chat console support for I/O
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## Console extensions
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Console extensions are the most basic kind of extensions, a few lines of code can get us started.
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A console extension is made of a Java class that extends _Extension_.
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Let's start a sample extension creating a maven project:
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Since G-Earth is built using maven, once we've compiled G-Earth, it's possible to add it as a project dependency:
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>G-EarthGang</groupId>
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<artifactId>SampleExtension</artifactId>
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<version>1.0-SNAPSHOT</version>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-jar-plugin</artifactId>
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<version>2.5</version>
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<configuration>
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<outputDirectory>${project.build.directory}/bin</outputDirectory>
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<archive>
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<manifest>
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<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
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<addClasspath>true</addClasspath>
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<classpathPrefix>lib/</classpathPrefix>
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<mainClass>SampleExtension</mainClass>
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<useUniqueVersions>false</useUniqueVersions>
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</manifest>
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</archive>
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</configuration>
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</plugin>
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<plugin>
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<artifactId>maven-assembly-plugin</artifactId>
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<version>2.5</version>
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<executions>
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<execution>
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<phase>package</phase>
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<goals>
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<goal>single</goal>
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</goals>
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</execution>
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</executions>
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<configuration>
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<outputDirectory>${project.build.directory}/bin</outputDirectory>
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<archive>
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<manifest>
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<mainClass>SampleExtension</mainClass>
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</manifest>
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</archive>
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<descriptorRefs>
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<descriptorRef>jar-with-dependencies</descriptorRef>
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</descriptorRefs>
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<finalName>SampleExtension</finalName>
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<appendAssemblyId>false</appendAssemblyId>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>8</source>
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<target>8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<dependency>
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<groupId>G-Earth</groupId>
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<artifactId>G-Earth</artifactId>
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<version>0.2</version>
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</dependency>
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</dependencies>
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</project>
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```
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That should be enough to configure maven. Now let's move on to the code.
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Every extension needs to include an _ExtensionInfo_ annotation in order to identify the extension, our ExtensionInfo would look like this:
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```java
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@ExtensionInfo(
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Title = "Sample Extension",
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Description = "Used for the wiki",
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Version = "1.0",
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Author = "G-Earth"
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)
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```
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The extension constitutes a standalone jar, so we'll need to include a main method to start it up like this:
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```java
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public class SampleExtension extends Extension {
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private SampleExtension(String[] args) {
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super(args);
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}
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public static void main(String[] args) {
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new SampleExtension(args).run();
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}
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}
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```
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That would be a bare minimum to get it loaded into G-Earth, now let's have a look at the API to improve our little extension
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## A quick look to the extensions API
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In this section we'll build upon the previous example with the functionality provided by G-Earth's API
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### Intercepting packets
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The _intercept_ method lets us intercept a packet from its id and modify it if we want to.
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```java
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intercept(HMessage.Side.TOCLIENT, 4000, hMessage -> {
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// oops we got disconnected
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});
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```
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### Sending packets
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G-Earth includes the sendTo[Client/Server] method in order to send packets.
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```java
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sendToClient(new HPacket("{l}{u:1234}"));
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// or
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sendToClient(new HPacket(1234));
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```
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### Initializing our extension
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_initExtension_ is called whenever G-Earth loads the extension, it's specially useful to init the _HashSupport_ and other features, we'll use it in the following examples
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### Doing stuff upon client connection
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```java
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@Override
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protected void onStartConnection() {
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// we're connected to habbo
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}
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```
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### HashSupport
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_HashSupport_ allows us to use hashes/names in order to intercept and send packets, using the aforementioned methods.
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```java
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private HashSupport mHashSupport;
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@Override
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protected void initExtension() {
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// This is called when G-Earth loads the extension
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mHashSupport = new HashSupport(this);
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mHashSupport.intercept(HMessage.Side.TOCLIENT, "RoomUserStartTyping", hMessage -> {
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mHashSupport.sendToServer("RoomUserStopTyping");
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});
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}
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```
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### ChatConsole
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_ChatConsole_ is a new G-Earth feature that allows us to use the in-game chat in order to communicate with the extension, it can read your input and write messages, you can also set a welcome message, we'll add it to our example.
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```java
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private HashSupport mHashSupport;
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private ChatConsole mChatConsole;
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@Override
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protected void initExtension() {
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// This is called when G-Earth loads the extension
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mHashSupport = new HashSupport(this);
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mChatConsole = new ChatConsole(mHashSupport, this, "I'm a welcome message!");
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mChatConsole.onInput(input -> {
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if (input.equals("ping"))
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mChatConsole.writeOutput("pong", false);
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});
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}
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```
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Once loaded it will appear to your friend's list<br/>
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It will show the welcome message after typing _:info_ <br/>
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<br/>
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If used correctly it can be pretty powerful.
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