!!! DISCLAIMER !!!: The current code currently wraps the new launcher! Management of the old launcher has drastically changed. Version 1.0 has full support for the old launcher, and 1.0 source code can be found in the old-launcher branch of this repository tree.

Minecraft Launcher Library

The most powerful Minecraft Launcher library which gives full access and management to the Minecraft launcher

Features:

• Profiles Management: You can create launcher profiles and remove them, with flexible methods and full control over the profile. (Examples below)
• Authentication Database: The launcher by default exposes the logged-in emails, and includes their IGN display name, access/session token, user ID, UUID and e-mail. (Example below)
• Launcher version: The launcher also exposes information about the build version. Information exposed includes the launcher build name, the format and the profiles format. (Examples below)
• Launcher data: Such as the currently selected user UUID, the currently selected profile and the current client token.
• Settings: Settings in which control the game launching.
• Basic launcher features: This includes fetching Minecraft's working directory. More features will be added to this.
• Fast and fully documented

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Examples

Part I: Profiles Management:

Creating a custom profile:

LauncherProfile myProfile = new LauncherProfileBuilder()
        .setName("My Profile")
        .setVersionID("1.8.8")
        .setIcon("Base64 encoded image here")
        // More setters are available, though we won't cover all of them
        .build();

Controlling profiles:

1- Declaring the instance:

// You can initiate your own profile manager as well if you want to provide a custom location for the launcher_version.json.
ProfileManager profileManager = ProfilesManager.getInstance();

2- For creating a profile

// Add our own profile
LauncherProfile myProfile = new LauncherProfileBuilder()
        .setName("Boop")
        .setVersionID("1.8.8")
        .build();
profileManager.addProfile(myProfile).save();
// If we're done adding all the profiles we want, you must call:

3- For removing a profile

profilesManager.removeProfile("Boop").save();

Note: ProfileManager allows chaining methods. For example, it's possible to do profileManager.addProfile(profile).removeProfile("Profile to remove").save();

4- Getting an already existing LauncherProfile:

LauncherProfile profile = profilesManager.getProfile("My Profile");
System.out.println("Profile Created At: " + profile.getCreationDate());

• If you would like to create a modifiable object of this, you can invoke LauncherProfile#asBuilder() which would return a LauncherProfileBuilder. Do note that changes done in the builder do not modify the parent profile object

Part II: Authentication Database

The launcher by default exposes the auth information such as sessions, access tokens, logged-in and selected emails, etc. You can access those from LauncherContext:

Accessing the database:

LauncherContext context = MinecraftLauncher.getInstance().getLauncherContext();
Map<String, ProfileAccount> auth = context.getAuthenticationDatabase();
System.out.println(auth.get("4d0faeedcbc319d7268ec15abfdc7a73").getEmail());

Part III: Launcher Version:

The launcher also exposes information about the current launcher build (version). This is perhaps used internally by the launcher to allow compatibility across all launcher versions.

LauncherContext context = MinecraftLauncher.getInstance().getLauncherContext();
LauncherVersion version = context.getLauncherVersion();
System.out.println("Launcher version: " + version.getName());
System.out.println("Format: " + version.getFormat());
System.out.println("Profiles format: " + version.getProfilesFormat());

Part IV: Launcher data:

Little things like the currently selected user and profile are saved inside the launcher data. They can be accessed using this library. They may not have a specific section which contains them.

LauncherContext context = MinecraftLauncher.getInstance().getLauncherContext();
System.out.println("Selected Profile: " + context.getSelectedProfile());
System.out.println("Analytics Token: " + context.getAnalyticsToken());
System.out.println("Analytics Fail Count: " + context.getAnalyticsFailCount());

• Selected user: You can access the selected user as well from the LauncherContext. Data is accessible from ProfileUser.

ProfileUser selectedUser = context.getSelectedUser();
System.out.println("UUID: " + selectedUser.getProfileUUID());

Part V: Settings

Settings are saved in their own section and are accessible through this library.

LauncherSettings settings = context.getSettings();
...

Part VI: Extra features

The library also comes with a few extra features for the launcher.

• Accessing Minecraft's working directory (.minecraft): This can be accessed through MinecraftLauncher.WORKING_DIRECTORY which will return the cached location. This method uses the same exact method the Minecraft launcher uses so it should be at least 97% accurate. If you want the latest working directory, you can get it using MinecraftLauncher.getExpectedWorkingDirectory().
• Useful Minecraft constants: Such as FILE_NAME, WORKING_DIRECTORY, DATA_FILE, GSON, etc.