Extensible Account (#301)

* refactor Account

* clean up implementation and docs

* add AccountTrait::join

* update changelog

* update example

1 files changed, 37 insertions, 0 deletions

diff --git a/azalea-client/src/account/offline.rs b/azalea-client/src/account/offline.rs
new file mode 100644
index 00000000..f0ee49bd
--- /dev/null
+++ b/azalea-client/src/account/offline.rs
@@ -0,0 +1,37 @@
+use uuid::Uuid;
+
+use crate::account::{Account, AccountTrait};
+
+/// A type of account that does not perform any authentication and cannot join
+/// online-mode servers.
+///
+/// This type is not intended to be used directly by the user. To actually make
+/// an offline-mode account, see [`Account::offline`].
+#[derive(Debug)]
+pub struct OfflineAccount {
+    username: String,
+}
+impl AccountTrait for OfflineAccount {
+    fn username(&self) -> &str {
+        &self.username
+    }
+    fn uuid(&self) -> Uuid {
+        azalea_crypto::offline::generate_uuid(&self.username)
+    }
+    fn access_token(&self) -> Option<String> {
+        None
+    }
+}
+
+impl Account {
+    /// An offline account does not authenticate with Microsoft's servers, and
+    /// as such can only join offline mode servers.
+    ///
+    /// This is useful for testing in LAN worlds.
+    pub fn offline(username: &str) -> Self {
+        OfflineAccount {
+            username: username.to_owned(),
+        }
+        .into()
+    }
+}