Files
lazymc/src/mc/uuid.rs

34 lines
966 B
Rust

use md5::{Digest, Md5};
use uuid::Uuid;
/// Offline player namespace.
const OFFLINE_PLAYER_NAMESPACE: &str = "OfflinePlayer:";
/// Get UUID for given player username.
fn player_uuid(username: &str) -> Uuid {
java_name_uuid_from_bytes(username.as_bytes())
}
/// Get UUID for given offline player username.
pub fn offline_player_uuid(username: &str) -> Uuid {
player_uuid(&format!("{}{}", OFFLINE_PLAYER_NAMESPACE, username))
}
/// Java's `UUID.nameUUIDFromBytes`
///
/// Static factory to retrieve a type 3 (name based) `Uuid` based on the specified byte array.
///
/// Ported from: https://git.io/J1b6A
fn java_name_uuid_from_bytes(data: &[u8]) -> Uuid {
let mut hasher = Md5::new();
hasher.update(data);
let mut md5: [u8; 16] = hasher.finalize().into();
md5[6] &= 0x0f; // clear version
md5[6] |= 0x30; // set to version 3
md5[8] &= 0x3f; // clear variant
md5[8] |= 0x80; // set to IETF variant
Uuid::from_bytes(md5)
}