Don't print message if YubiKey is waiting for touch

The user call-to-action will instead be implemented on the client side,
where it can be done in a more forgiving way (allowing the user some
time to react before prompting them that it is waiting on the plugin).

i18n/en-US/age_plugin_yubikey.ftl

@@ -164,8 +164,6 @@ plugin-err-pin-too-short    = PIN was too short.
 plugin-err-pin-too-long     = PIN was too long.
 plugin-err-pin-required     = A PIN is required for {-yubikey} with serial {$yubikey_serial}
 
-plugin-touch-yk = 👆 Please touch the {-yubikey}
-
 ## Errors
 
 err-custom-mgmt-key      = Custom unprotected management keys are not supported.

src/key.rs

@@ -447,26 +447,16 @@ impl Connection {
         Ok(Ok(()))
     }
 
-    pub(crate) fn unwrap_file_key<E>(
-        &mut self,
-        line: &RecipientLine,
-        callbacks: &mut dyn Callbacks<E>,
-    ) -> io::Result<Result<FileKey, ()>> {
+    pub(crate) fn unwrap_file_key(&mut self, line: &RecipientLine) -> Result<FileKey, ()> {
         assert_eq!(self.tag, line.tag);
 
-        // If the touch policy requires it, request a touch.
-        let requested_touch = match (
+        // Check if the touch policy requires a touch.
+        let needs_touch = match (
             self.cached_metadata.as_ref().and_then(|m| m.touch_policy),
             self.last_touch,
         ) {
-            (Some(TouchPolicy::Always), _) | (Some(TouchPolicy::Cached), None) => {
-                callbacks.message(&fl!("plugin-touch-yk"))?.unwrap();
-                true
-            }
-            (Some(TouchPolicy::Cached), Some(last)) if last.elapsed() >= FIFTEEN_SECONDS => {
-                callbacks.message(&fl!("plugin-touch-yk"))?.unwrap();
-                true
-            }
+            (Some(TouchPolicy::Always), _) | (Some(TouchPolicy::Cached), None) => true,
+            (Some(TouchPolicy::Cached), Some(last)) if last.elapsed() >= FIFTEEN_SECONDS => true,
             _ => false,
         };
 
@@ -479,11 +469,11 @@ impl Connection {
             SlotId::Retired(self.slot),
         ) {
             Ok(res) => res,
-            Err(_) => return Ok(Err(())),
+            Err(_) => return Err(()),
         };
 
         // If we requested a touch and reached here, the user touched the YubiKey.
-        if requested_touch {
+        if needs_touch {
             if let Some(TouchPolicy::Cached) =
                 self.cached_metadata.as_ref().and_then(|m| m.touch_policy)
             {
@@ -500,10 +490,10 @@ impl Connection {
         // A failure to decrypt is fatal, because we assume that we won't
         // encounter 32-bit collisions on the key tag embedded in the header.
         match aead_decrypt(&enc_key, FILE_KEY_BYTES, &line.encrypted_file_key) {
-            Ok(pt) => Ok(Ok(TryInto::<[u8; FILE_KEY_BYTES]>::try_into(&pt[..])
+            Ok(pt) => Ok(TryInto::<[u8; FILE_KEY_BYTES]>::try_into(&pt[..])
                 .unwrap()
-                .into())),
-            Err(_) => Ok(Err(())),
+                .into()),
+            Err(_) => Err(()),
         }
     }
 }

src/plugin.rs

@@ -222,7 +222,7 @@ impl IdentityPluginV1 for IdentityPlugin {
                 }
 
                 for (stanza_index, line) in stanzas.iter().enumerate() {
-                    match conn.unwrap_file_key(line, &mut callbacks)? {
+                    match conn.unwrap_file_key(line) {
                         Ok(file_key) => {
                             // We've managed to decrypt this file!
                             file_keys.entry(file_index).or_insert(Ok(file_key));