Limited use registration token support

Co-authored-by: Ginger <ginger@gingershaped.computer>
Signed-off-by: Jason Volk <jason@zemos.net>

src/admin/token/mod.rs

@@ -0,0 +1,36 @@
+mod commands;
+
+use clap::Subcommand;
+use tuwunel_core::Result;
+
+use crate::admin_command_dispatch;
+
+#[admin_command_dispatch]
+#[derive(Debug, Subcommand)]
+pub(crate) enum TokenCommand {
+	/// - Issue a new registration token
+	Issue {
+		/// The maximum number of times this token is allowed to be used before
+		/// it expires.
+		#[arg(long)]
+		max_uses: Option<u64>,
+
+		/// The maximum age of this token (e.g. 30s, 5m, 7d). It will expire
+		/// after this much time has passed.
+		#[arg(long)]
+		max_age: Option<String>,
+
+		/// A shortcut for `--max-uses 1`.
+		#[arg(long)]
+		once: bool,
+	},
+
+	/// - Revoke a registration token
+	Revoke {
+		/// The token to revoke.
+		token: String,
+	},
+
+	/// - List all registration tokens
+	List,
+}