Use concrete Error for Signer

plume-models/src/lib.rs

@@ -17,7 +17,7 @@ extern crate serde_json;
 extern crate tantivy;
 
 use once_cell::sync::Lazy;
-use plume_common::activity_pub::inbox::InboxError;
+use plume_common::activity_pub::{inbox::InboxError, sign};
 use posts::PostEvent;
 use riker::actors::{channel, ActorSystem, ChannelRef, SystemBuilder};
 use users::UserEvent;
@@ -79,6 +79,12 @@ impl From<openssl::error::ErrorStack> for Error {
     }
 }
 
+impl From<sign::Error> for Error {
+    fn from(_: sign::Error) -> Self {
+        Error::Signature
+    }
+}
+
 impl From<diesel::result::Error> for Error {
     fn from(err: diesel::result::Error) -> Self {
         Error::Db(err)