authlib-injector

authlib-injector enables you to build a Minecraft authentication system offering all the features that genuine Minecraft has.

See the wiki for documents and detailed descriptions.

Download

You can download the latest authlib-injector build from here.

Dependencies: Gradle, JDK 8+

Run:

gradle

Build output can be found in build/libs.

The authentication server is required to implement Yggdrasil Server Specification.

Configure Minecraft server with the following JVM parameter:

-javaagent:{/path/to/authlib-injector.jar}={API Root of Authentication Server}

Add the following JVM parameter:

-Dauthlibinjector.debug={types of logs to print}

Types of logs:

launch startup of authlib-injector
transform bytecode modification
config configuration fetching
httpd local http server (The local http server acts as a reverse proxy between client and the remote authentication server, which allows authlib-injector to implement enhancements.)
authlib logs intercepted from authlib (which contains detailed network communication)

Use , as the separator when specifying multiple types. To print all the logs, set the type to all.

Dump the modified classes to current directory with the following JVM parameter:

-Dauthlibinjector.dumpClass=true