src/imap/command/anystate.rs

@@ -6,8 +6,11 @@ use crate::imap::flow;
 use crate::imap::response::Response;
 
 pub(crate) fn capability(tag: Tag<'static>) -> Result<(Response<'static>, flow::Transition)> {
-    let capabilities: NonEmptyVec<Capability> =
-        (vec![Capability::Imap4Rev1, Capability::Idle]).try_into()?;
+    let capabilities: NonEmptyVec<Capability> = (vec![
+        Capability::Imap4Rev1,
+        Capability::try_from("UNSELECT").unwrap(),
+    ])
+    .try_into()?;
     let res = Response::build()
         .tag(tag)
         .message("Server capabilities")

src/imap/command/examined.rs

@@ -28,7 +28,7 @@ pub async fn dispatch(ctx: ExaminedContext<'_>) -> Result<(Response<'static>, fl
 
         // Specific to the EXAMINE state (specialization of the SELECTED state)
         // ~3 commands -> close, fetch, search + NOOP
-        CommandBody::Close => ctx.close().await,
+        CommandBody::Close => ctx.close("CLOSE").await,
         CommandBody::Fetch {
             sequence_set,
             macro_or_item_names,
@@ -44,10 +44,13 @@ pub async fn dispatch(ctx: ExaminedContext<'_>) -> Result<(Response<'static>, fl
             Response::build()
                 .to_req(ctx.req)
                 .message("Forbidden command: can't write in read-only mode (EXAMINE)")
-                .bad()?,
+                .no()?,
             flow::Transition::None,
         )),
 
+        // UNSELECT extension (rfc3691)
+        CommandBody::Unselect => ctx.close("UNSELECT").await,
+
         // In examined mode, we fallback to authenticated when needed
         _ => {
             authenticated::dispatch(authenticated::AuthenticatedContext {
@@ -64,11 +67,11 @@ pub async fn dispatch(ctx: ExaminedContext<'_>) -> Result<(Response<'static>, fl
 impl<'a> ExaminedContext<'a> {
     /// CLOSE in examined state is not the same as in selected state
     /// (in selected state it also does an EXPUNGE, here it doesn't)
-    async fn close(self) -> Result<(Response<'static>, flow::Transition)> {
+    async fn close(self, kind: &str) -> Result<(Response<'static>, flow::Transition)> {
         Ok((
             Response::build()
                 .to_req(self.req)
-                .message("CLOSE completed")
+                .message(format!("{} completed", kind))
                 .ok()?,
             flow::Transition::Unselect,
         ))

src/imap/command/selected.rs

@@ -59,6 +59,9 @@ pub async fn dispatch<'a>(
             uid,
         } => ctx.copy(sequence_set, mailbox, uid).await,
 
+        // UNSELECT extension (rfc3691)
+        CommandBody::Unselect => ctx.unselect().await,
+
         // In selected mode, we fallback to authenticated when needed
         _ => {
             authenticated::dispatch(authenticated::AuthenticatedContext {
@@ -84,6 +87,16 @@ impl<'a> SelectedContext<'a> {
         ))
     }
 
+    async fn unselect(self) -> Result<(Response<'static>, flow::Transition)> {
+        Ok((
+            Response::build()
+                .to_req(self.req)
+                .message("UNSELECT completed")
+                .ok()?,
+            flow::Transition::Unselect,
+        ))
+    }
+
     pub async fn fetch(
         self,
         sequence_set: &SequenceSet,