keyfork-prompt: add choice mechanism

crates/daemon/keyforkd-client/src/lib.rs

@@ -1,10 +1,8 @@
 //! # The Keyforkd Client
 //!
 //! Keyfork allows securing the master key and highest-level derivation keys by having derivation
-//! requests performed against a server, "Keyforkd" or the "Keyfork Server". This allows
+//! requests performed against a server, "Keyforkd" or the "Keyfork Server". The server is operated
-//! enforcement of policies, such as requiring at least two leves of a derivation path (for
+//! on a UNIX socket with messages sent using the Keyfork Frame format.
-//! instance, `m/0'` would not be allowed, but `m/0'/0'` would). The server is operated on a UNIX
-//! socket with messages sent using the Keyfork Frame format.
 //!
 //! Programs using the Keyfork Client should ensure they are built against a compatible version of
 //! the Keyfork Server. For versions prior to `1.0.0`, all versions within a "minor" version (i.e.,
@@ -12,58 +10,9 @@
 //! after `1.0.0`, all versions within a "major" version (i.e., `1.0.0`) will be compatible, but
 //! `1.x.y` will not be compatible with `2.0.0`.
 //!
-//! The Keyfork Client documentation makes extensive use of the `keyforkd::test_util` module.
+//! Presently, the Keyfork server only supports the following requests:
-//! This provides testing infrastructure to set up a temporary Keyfork Daemon. In
-//! your code, you should assume the daemon has already been initialized, whether by another
-//! process, on another terminal, or some other instance. At no point should a program deriving an
-//! "endpoint" key have control over a mnemonic or a seed.
 //!
-//! ## Server Requests
+//! * Derive Key
-//!
-//! Keyfork is designed as a client-request/server-response model. The client sends a request, such
-//! as a derivation request, and the server sends its response.  Presently, the Keyfork server
-//! supports the following requests:
-//!
-//! ### Request: Derive Key
-//!
-//! The client creates a derivation path of at least two indices and requests a derived XPrv
-//! (Extended Private Key) from the server.
-//!
-//! ```rust
-//! use std::str::FromStr;
-//!
-//! use keyforkd_client::Client;
-//! use keyfork_derive_util::DerivationPath;
-//! # use keyfork_derive_util::private_key::TestPrivateKey as PrivateKey;
-//! // use k256::SecretKey as PrivateKey;
-//! // use ed25519_dalek::SigningKey as PrivateKey;
-//!
-//! #[derive(Debug, thiserror::Error)]
-//! enum Error {
-//!     #[error(transparent)]
-//!     Path(#[from] keyfork_derive_util::PathError),
-//!
-//!     #[error(transparent)]
-//!     Keyforkd(#[from] keyforkd_client::Error),
-//! }
-//!
-//! fn main() -> Result<(), Error> {
-//! #   let seed = b"funky accordion noises";
-//! #   keyforkd::test_util::run_test(seed, |socket_path| {
-//!     let derivation_path = DerivationPath::from_str("m/44'/0'")?;
-//!     let mut client = Client::discover_socket()?;
-//!     let xprv = client.request_xprv::<PrivateKey>(&derivation_path)?;
-//! #   Ok::<_, Error>(())
-//! #   })?;
-//!     Ok(())
-//! }
-//! ```
-//!
-//! ---
-//!
-//! Request objects are typically handled by the Keyfork Client library (such as with
-//! [`Client::request_xprv`]). While unadvised, clients can also attempt to handle their own
-//! requests, using [`Client::request`].
 //!
 //! ## Extended Private Keys
 //!
@@ -72,101 +21,42 @@
 //! The tests for this library ensure that all levels of Keyfork derivation beyond the required two
 //! will be derived similarly between the server and the client.
 //!
+//! # Examples
 //! ```rust
 //! use std::str::FromStr;
 //!
 //! use keyforkd_client::Client;
-//! use keyfork_derive_util::{DerivationIndex, DerivationPath};
+//! use keyfork_derive_util::DerivationPath;
 //! # use keyfork_derive_util::private_key::TestPrivateKey as PrivateKey;
 //! // use k256::SecretKey as PrivateKey;
 //! // use ed25519_dalek::SigningKey as PrivateKey;
-//! # fn check_wallet<T>(_: T) {}
 //!
-//! #[derive(Debug, thiserror::Error)]
-//! enum Error {
-//!     #[error(transparent)]
-//!     Index(#[from] keyfork_derive_util::IndexError),
-//!
-//!     #[error(transparent)]
-//!     Path(#[from] keyfork_derive_util::PathError),
-//!
-//!     #[error(transparent)]
-//!     PrivateKey(#[from] keyfork_derive_util::PrivateKeyError),
-//!
-//!     #[error(transparent)]
-//!     Keyforkd(#[from] keyforkd_client::Error),
-//! }
-//!
-//! fn main() -> Result<(), Error> {
 //! # let seed = b"funky accordion noises";
 //! # keyforkd::test_util::run_test(seed, |socket_path| {
-//!     let derivation_path = DerivationPath::from_str("m/44'/0'/0'/0")?;
+//! # std::env::set_var("KEYFORKD_SOCKET_PATH", socket_path);
-//!     let mut client = Client::discover_socket()?;
-//!     let xprv = client.request_xprv::<PrivateKey>(&derivation_path)?;
-//!     // scan first 20 wallets
-//!     for index in 0..20 {
-//!         // use non-hardened derivation
-//!         let new_xprv = xprv.derive_child(&DerivationIndex::new(index, false)?);
-//!         check_wallet(new_xprv)
-//!     }
-//! #   Ok::<_, Error>(())
-//! #   })?;
-//!     Ok(())
-//! }
-//! ```
-//!
-//! ## Testing Infrastructure
-//!
-//! In tests, the `keyforkd::test_util` module and TestPrivateKeys can be used. These provide
-//! useful utilities for writing tests that interact with the Keyfork Server without needing to
-//! manually create the server for the purpose of the test. The `run_test` method can be used to
-//! run a test, which can handle both returning errors and correctly translating panics (though,
-//! the panics definitely won't look tidy).
-//!
-//! ```rust
-//! use std::str::FromStr;
-//!
-//! use keyforkd_client::Client;
-//! use keyfork_derive_util::DerivationPath;
-//! use keyfork_derive_util::private_key::TestPrivateKey as PrivateKey;
-//!
-//! #[derive(Debug, thiserror::Error)]
-//! enum Error {
-//!     #[error(transparent)]
-//!     Path(#[from] keyfork_derive_util::PathError),
-//!
-//!     #[error(transparent)]
-//!     Keyforkd(#[from] keyforkd_client::Error),
-//! }
-//!
-//! fn main() -> Result<(), Error> {
-//!     let seed = b"funky accordion noises";
-//!     keyforkd::test_util::run_test(seed, |socket_path| {
-//!         let derivation_path = DerivationPath::from_str("m/44'/0'")?;
-//!         let mut client = Client::discover_socket()?;
-//!         let xprv = client.request_xprv::<PrivateKey>(&derivation_path)?;
-//!         Ok::<_, Error>(())
-//!     })?;
-//!     Ok(())
-//! }
-//! ```
-//!
-//! If you would rather write tests to panic rather than error, or would rather not deal with error
-//! types, the Panicable type should be used, which will handle the Error type for the closure.
-//!
-//! ```rust
-//! use std::str::FromStr;
-//!
-//! use keyforkd_client::Client;
-//! use keyfork_derive_util::DerivationPath;
-//! use keyfork_derive_util::private_key::TestPrivateKey as PrivateKey;
-//!
-//! let seed = b"funky accordion noises";
-//! keyforkd::test_util::run_test(seed, |socket_path| {
 //! let derivation_path = DerivationPath::from_str("m/44'/0'").unwrap();
 //! let mut client = Client::discover_socket().unwrap();
 //! let xprv = client.request_xprv::<PrivateKey>(&derivation_path).unwrap();
-//!     keyforkd::test_util::Panicable::Ok(())
+//! # keyforkd::test_util::Infallible::Ok(())
+//! # }).unwrap();
+//! ```
+//!
+//! In tests, the Keyforkd test_util module and TestPrivateKeys can be used.
+//!
+//! ```rust
+//! use std::str::FromStr;
+//!
+//! use keyforkd_client::Client;
+//! use keyfork_derive_util::DerivationPath;
+//! use keyfork_derive_util::private_key::TestPrivateKey as PrivateKey;
+//!
+//! let seed = b"funky accordion noises";
+//! keyforkd::test_util::run_test(seed, |socket_path| {
+//!     std::env::set_var("KEYFORKD_SOCKET_PATH", socket_path);
+//!     let derivation_path = DerivationPath::from_str("m/44'/0'").unwrap();
+//!     let mut client = Client::discover_socket().unwrap();
+//!     let xprv = client.request_xprv::<PrivateKey>(&derivation_path).unwrap();
+//!     keyforkd::test_util::Infallible::Ok(())
 //! }).unwrap();
 //! ```
 
@@ -275,9 +165,10 @@ impl Client {
     ///
     /// # let seed = b"funky accordion noises";
     /// # keyforkd::test_util::run_test(seed, |socket_path| {
-    /// let mut socket = get_socket()?;
+    /// # std::env::set_var("KEYFORKD_SOCKET_PATH", socket_path);
+    /// let mut socket = get_socket().unwrap();
     /// let mut client = Client::new(socket);
-    /// # Ok::<_, keyforkd_client::Error>(())
+    /// # keyforkd::test_util::Infallible::Ok(())
     /// # }).unwrap();
     /// ```
     pub fn new(socket: UnixStream) -> Self {
@@ -296,8 +187,9 @@ impl Client {
     ///
     /// # let seed = b"funky accordion noises";
     /// # keyforkd::test_util::run_test(seed, |socket_path| {
-    /// let mut client = Client::discover_socket()?;
+    /// # std::env::set_var("KEYFORKD_SOCKET_PATH", socket_path);
-    /// # Ok::<_, keyforkd_client::Error>(())
+    /// let mut client = Client::discover_socket().unwrap();
+    /// # keyforkd::test_util::Infallible::Ok(())
     /// # }).unwrap();
     /// ```
     pub fn discover_socket() -> Result<Self> {
@@ -325,10 +217,11 @@ impl Client {
     ///
     /// # let seed = b"funky accordion noises";
     /// # keyforkd::test_util::run_test(seed, |socket_path| {
+    /// # std::env::set_var("KEYFORKD_SOCKET_PATH", socket_path);
     /// let derivation_path = DerivationPath::from_str("m/44'/0'").unwrap();
     /// let mut client = Client::discover_socket().unwrap();
     /// let xprv = client.request_xprv::<PrivateKey>(&derivation_path).unwrap();
-    /// # keyforkd::test_util::Panicable::Ok(())
+    /// # keyforkd::test_util::Infallible::Ok(())
     /// # }).unwrap();
     /// ```
     pub fn request_xprv<K>(&mut self, path: &DerivationPath) -> Result<ExtendedPrivateKey<K>>
@@ -351,20 +244,15 @@ impl Client {
             _ => Err(Error::InvalidResponse),
         }
     }
-}
 
-impl Client {
     /// Serialize and send a [`Request`] to the server, awaiting a [`Result<Response>`].
     ///
-    /// This function does not properly assert the association between a request type and a
-    /// response type, and does not perform any serialization of native objects into Request or
-    /// Response types, and should only be used when absolutely necessary.
-    ///
     /// # Errors
     /// An error may be returned if:
     /// * Reading or writing from or to the socket encountered an error.
     /// * Bincode could not serialize the request or deserialize the response.
     /// * An error occurred in Keyforkd.
+    #[doc(hidden)]
     pub fn request(&mut self, req: &Request) -> Result<Response> {
         try_encode_to(&bincode::serialize(&req)?, &mut self.socket)?;
         let resp = try_decode_from(&mut self.socket)?;

crates/daemon/keyforkd-client/src/tests.rs

@@ -1,7 +1,7 @@
 use crate::Client;
 use keyfork_derive_util::{request::*, DerivationPath};
 use keyfork_slip10_test_data::test_data;
-use keyforkd::test_util::{run_test, Panicable};
+use keyforkd::test_util::{run_test, Infallible};
 use std::{os::unix::net::UnixStream, str::FromStr};
 
 #[test]
@@ -109,7 +109,7 @@ fn ed25519_test_suite() {
                     DerivationResponse::try_from(client.request(&req.into()).unwrap()).unwrap();
                 assert_eq!(&response.data, test.private_key.as_slice());
             }
-            Panicable::Ok(())
+            Infallible::Ok(())
         })
         .unwrap();
     }

crates/daemon/keyforkd/src/test_util.rs

@@ -12,21 +12,20 @@ use keyfork_bug::bug;
 #[derive(Debug, thiserror::Error)]
 #[error("This error can never be instantiated")]
 #[doc(hidden)]
-pub enum UninstantiableError {}
+pub struct InfallibleError {
+    protected: (),
+}
 
-/// A panicable result. This type can be used when a closure chooses to panic instead of
+/// An infallible result. This type can be used to represent a function that should never error.
-/// returning an error.  This doesn't necessarily mean a closure _has_ to panic, and its absence
-/// doesn't imply a closure _can't_ panic, but this is a useful utility function for writing tests,
-/// to avoid the necessity of making custom error types.
 ///
 /// ```rust
-/// use keyforkd::test_util::Panicable;
+/// use keyforkd::test_util::Infallible;
 /// let closure = || {
-///     Panicable::Ok(())
+///     Infallible::Ok(())
 /// };
 /// assert!(closure().is_ok());
 /// ```
-pub type Panicable<T> = std::result::Result<T, UninstantiableError>;
+pub type Infallible<T> = std::result::Result<T, InfallibleError>;
 
 /// Run a test making use of a Keyforkd server. The test may use a seed (the first argument) from a
 /// test suite, or (as shown in the example below) a simple seed may be used solely to ensure
@@ -40,8 +39,6 @@ pub type Panicable<T> = std::result::Result<T, UninstantiableError>;
 /// runtime.
 ///
 /// # Examples
-/// The test utility provides a socket that can be connected to for deriving keys.
-///
 /// ```rust
 /// use std::os::unix::net::UnixStream;
 /// let seed = b"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
@@ -49,18 +46,6 @@ pub type Panicable<T> = std::result::Result<T, UninstantiableError>;
 ///     UnixStream::connect(&path).map(|_| ())
 /// }).unwrap();
 /// ```
-///
-/// The `keyforkd-client` crate uses the `KEYFORKD_SOCKET_PATH` variable to determine the default
-/// socket path. The test will export the environment variable so it may be used by default.
-///
-/// ```rust
-/// use std::os::unix::net::UnixStream;
-/// let seed = b"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
-/// keyforkd::test_util::run_test(seed.as_slice(), |path| {
-///     assert_eq!(std::env::var_os("KEYFORKD_SOCKET_PATH").unwrap(), path.as_os_str());
-///     UnixStream::connect(&path).map(|_| ())
-/// }).unwrap();
-/// ```
 #[allow(clippy::missing_errors_doc)]
 pub fn run_test<F, E>(seed: &[u8], closure: F) -> Result<(), E>
 where
@@ -97,7 +82,6 @@ where
         rx.recv()
             .await
             .expect(bug!("can't receive server start signal from channel"));
-        std::env::set_var("KEYFORKD_SOCKET_PATH", &socket_path);
         let test_handle = tokio::task::spawn_blocking(move || closure(&socket_path));
 
         let result = test_handle.await;
@@ -105,8 +89,8 @@ where
         result
     });
     if let Err(e) = result {
-        if let Ok(reason) = e.try_into_panic() {
+        if e.is_panic() {
-            std::panic::resume_unwind(reason);
+            std::panic::resume_unwind(e.into_panic());
         }
     }
     Ok(())
@@ -119,6 +103,6 @@ mod tests {
     #[test]
     fn test_run_test() {
         let seed = b"beefbeef";
-        run_test(seed, |_path| Panicable::Ok(())).expect("infallible");
+        run_test(seed, |_path| Infallible::Ok(())).expect("infallible");
     }
 }

crates/util/keyfork-prompt/src/lib.rs

@@ -108,7 +108,7 @@ pub trait PromptHandler {
     /// Prompt the user to select a choice between multiple options.
     ///
     /// # Errors
-    /// The method may return an error if the message was not able to be displayed or if a choice
+    /// The metho may return an error if the message was not able to be displayed or if a choice
     /// could not be received.
     fn prompt_choice<'a, T>(
         &mut self,

crates/util/keyfork-prompt/src/terminal.rs

@@ -510,6 +510,7 @@ where
                         return Err(Error::CtrlC);
                     }
                     KeyCode::Left => {
+                        eprintln!("{active_choice}");
                         // prevent underflow
                         // if 0, max is 1, -1 is 0, no underflow
                         // if 1, max is 1, -1 is 0
@@ -517,6 +518,7 @@ where
                         active_choice = std::cmp::max(1, active_choice) - 1;
                     }
                     KeyCode::Right => {
+                        eprintln!("{active_choice}");
                         active_choice = std::cmp::min(choices.len() - 1, active_choice + 1);
                     }
                     KeyCode::Enter => {