rad-remote-helper: honor RAD_PASSPHRASE

Make testing more convenient by reducing rad-remote-helper's dependency
on SSH Agent.  It may be opted out of by setting the `RAD_PASSPHRASE`
environment variable.

Signed-off-by: Slack Coder <slackcoder@server.ky>

radicle-cli/src/terminal/io.rs

@@ -7,7 +7,7 @@ use radicle::cob::issue::Issue;
 use radicle::cob::thread::CommentId;
 use radicle::crypto::ssh::keystore::Passphrase;
 use radicle::crypto::Signer;
-use radicle::profile::env::RAD_PASSPHRASE;
+use radicle::profile;
 use radicle::profile::Profile;
 
 use radicle_crypto::ssh::keystore::MemorySigner;
@@ -177,19 +177,16 @@ pub fn abort<D: fmt::Display>(prompt: D) -> bool {
 
 /// Get the signer. First we try getting it from ssh-agent, otherwise we prompt the user.
 pub fn signer(profile: &Profile) -> anyhow::Result<Box<dyn Signer>> {
-    let signer = if let Ok(passphrase) = read_passphrase_from_env_var() {
-        MemorySigner::load(&profile.keystore, passphrase)?.boxed()
-    } else if let Ok(signer) = profile.signer() {
-        signer.boxed()
-    } else {
-        let passphrase = secret_input();
-        let spinner = spinner("Unsealing key...");
-        let signer = MemorySigner::load(&profile.keystore, passphrase)?;
+    if let Ok(signer) = profile.signer() {
+        return Ok(signer);
+    }
 
-        spinner.finish();
-        signer.boxed()
-    };
-    Ok(signer)
+    let passphrase = secret_input();
+    let spinner = spinner("Unsealing key...");
+    let signer = MemorySigner::load(&profile.keystore, passphrase)?;
+
+    spinner.finish();
+    Ok(signer.boxed())
 }
 
 pub fn theme() -> ColorfulTheme {
@@ -313,9 +310,9 @@ pub fn secret_stdin() -> Result<Passphrase, anyhow::Error> {
 }
 
 pub fn read_passphrase(stdin: bool, confirm: bool) -> Result<Passphrase, anyhow::Error> {
-    let passphrase = match read_passphrase_from_env_var() {
-        Ok(input) => input,
-        _ => {
+    let passphrase = match profile::env::read_passphrase() {
+        Some(input) => input,
+        None => {
             if stdin {
                 secret_stdin()?
             } else if confirm {
@@ -329,12 +326,6 @@ pub fn read_passphrase(stdin: bool, confirm: bool) -> Result<Passphrase, anyhow:
     Ok(passphrase)
 }
 
-pub fn read_passphrase_from_env_var() -> Result<Passphrase, anyhow::Error> {
-    let passphrase = std::env::var(RAD_PASSPHRASE)?;
-
-    Ok(Passphrase::from(passphrase.trim_end().to_owned()))
-}
-
 pub fn select<'a, T>(options: &'a [T], active: &'a T) -> Option<&'a T>
 where
     T: fmt::Display + Eq + PartialEq,

radicle/src/profile.rs

@@ -15,13 +15,15 @@ use std::path::{Path, PathBuf};
 
 use thiserror::Error;
 
-use crate::crypto::ssh::agent::{Agent, AgentSigner};
+use crate::crypto::ssh::agent::Agent;
 use crate::crypto::ssh::{Keystore, Passphrase};
-use crate::crypto::PublicKey;
+use crate::crypto::{PublicKey, Signer};
 use crate::node;
 use crate::storage::git::transport;
 use crate::storage::git::Storage;
 
+use radicle_crypto::ssh::keystore;
+
 /// Environment variables used by radicle.
 pub mod env {
     pub use std::env::*;
@@ -32,6 +34,14 @@ pub mod env {
     pub const RAD_SOCKET: &str = "RAD_SOCKET";
     /// Passphrase for the encrypted radicle secret key.
     pub const RAD_PASSPHRASE: &str = "RAD_PASSPHRASE";
+
+    pub fn read_passphrase() -> Option<super::Passphrase> {
+        let Ok(passphrase) = std::env::var(RAD_PASSPHRASE) else {
+            return None;
+        };
+
+        Some(super::Passphrase::from(passphrase.trim_end().to_owned()))
+    }
 }
 
 #[derive(Debug, Error)]
@@ -40,6 +50,8 @@ pub enum Error {
     Io(#[from] io::Error),
     #[error(transparent)]
     Keystore(#[from] crate::crypto::ssh::keystore::Error),
+    #[error(transparent)]
+    MemorySigner(#[from] keystore::MemorySignerError),
     #[error("no profile found at the filepath '{0}'")]
     NotFound(PathBuf),
     #[error("error connecting to ssh-agent: {0}")]
@@ -95,12 +107,17 @@ impl Profile {
         &self.public_key
     }
 
-    pub fn signer(&self) -> Result<AgentSigner, Error> {
+    pub fn signer(&self) -> Result<Box<dyn Signer>, Error> {
+        if let Some(passphrase) = env::read_passphrase() {
+            let signer = keystore::MemorySigner::load(&self.keystore, passphrase)?;
+            return Ok(signer.boxed());
+        }
+
         match Agent::connect() {
             Ok(agent) => {
                 let signer = agent.signer(self.public_key);
                 if signer.is_ready()? {
-                    Ok(signer)
+                    Ok(signer.boxed())
                 } else {
                     Err(Error::KeyNotRegistered(self.public_key))
                 }