feat(unseal): add unseal protocol and crypto infrastructure

server/crates/arbiter-proto/src/lib.rs

@@ -4,4 +4,21 @@ pub mod proto {
     pub mod auth {
         tonic::include_proto!("arbiter.auth");
     }
-}
+}
+
+pub mod transport;
+
+pub static BOOTSTRAP_TOKEN_PATH: &'static str = "bootstrap_token";
+
+pub fn home_path() -> Result<std::path::PathBuf, std::io::Error> {
+    static ARBITER_HOME: &'static str = ".arbiter";
+    let home_dir = std::env::home_dir().ok_or(std::io::Error::new(
+        std::io::ErrorKind::PermissionDenied,
+        "can not get home directory",
+    ))?;
+
+    let arbiter_home = home_dir.join(ARBITER_HOME);
+    std::fs::create_dir_all(&arbiter_home)?;
+
+    Ok(arbiter_home)
+}