Fix incorrect UID NEXT when mailbox is empty (#1201)

crates/imap/src/core/message.rs

@@ -7,14 +7,17 @@
 use std::{collections::BTreeMap, sync::Arc};
 
 use ahash::AHashMap;
-use common::{listener::SessionStream, NextMailboxState};
+use common::{NextMailboxState, listener::SessionStream};
 use email::mailbox::UidMailbox;
-use imap_proto::protocol::{expunge, select::Exists, Sequence};
+use imap_proto::protocol::{Sequence, expunge, select::Exists};
 use jmap_proto::{
     object::Object,
     types::{collection::Collection, property::Property, value::Value},
 };
-use store::write::assert::HashedValue;
+use store::{
+    ValueKey,
+    write::{ValueClass, assert::HashedValue},
+};
 use trc::AddContext;
 
 use crate::core::ImapId;
@@ -37,8 +40,9 @@ impl<T: SessionStream> SessionData<T> {
             .await?
             .unwrap_or_default();
 
-        // Obtain UID validity
+        // Obtain UID validity and UID next
         let uid_validity = self.get_uid_validity(mailbox).await?;
+        let uid_next = self.get_uid_next(mailbox).await?;
 
         // Obtain current state
         let modseq = self
@@ -104,7 +108,7 @@ impl<T: SessionStream> SessionData<T> {
         }
 
         let mut state = MailboxState {
-            uid_next: uid_max + 1,
+            uid_next,
             uid_validity,
             total_messages: id_to_imap.len(),
             id_to_imap,
@@ -245,6 +249,21 @@ impl<T: SessionStream> SessionData<T> {
             })
             .map(|v| v as u32)
     }
+
+    pub async fn get_uid_next(&self, mailbox: &MailboxId) -> trc::Result<u32> {
+        self.server
+            .core
+            .storage
+            .data
+            .get_counter(ValueKey {
+                account_id: mailbox.account_id,
+                collection: Collection::Mailbox.into(),
+                document_id: mailbox.mailbox_id,
+                class: ValueClass::Property(Property::EmailIds.into()),
+            })
+            .await
+            .map(|v| (v + 1) as u32)
+    }
 }
 
 impl SelectedMailbox {

crates/imap/src/op/status.rs

@@ -11,24 +11,22 @@ use crate::{
     op::ImapContext,
     spawn_op,
 };
-use common::{listener::SessionStream, Mailbox};
+use common::{Mailbox, listener::SessionStream};
 use directory::Permission;
 use imap_proto::{
+    Command, ResponseCode, StatusResponse,
     parser::PushUnique,
     protocol::status::{Status, StatusItem, StatusItemType},
     receiver::Request,
-    Command, ResponseCode, StatusResponse,
 };
 use jmap_proto::{
     object::Object,
     types::{collection::Collection, id::Id, keyword::Keyword, property::Property, value::Value},
 };
-use store::{
-    roaring::RoaringBitmap,
-    write::{key::DeserializeBigEndian, ValueClass},
-    IndexKeyPrefix, IterateParams, ValueKey,
-};
 use store::{Deserialize, U32_LEN};
+use store::{
+    IndexKeyPrefix, IterateParams, roaring::RoaringBitmap, write::key::DeserializeBigEndian,
+};
 use trc::AddContext;
 
 use super::ToModSeq;
@@ -251,22 +249,10 @@ impl<T: SessionStream> SessionData<T> {
             for item in items_update {
                 let result = match item {
                     Status::Messages => mailbox_message_ids.as_ref().map(|v| v.len()).unwrap_or(0),
-                    Status::UidNext => {
-                        (self
-                            .server
-                            .core
-                            .storage
-                            .data
-                            .get_counter(ValueKey {
-                                account_id: mailbox.account_id,
-                                collection: Collection::Mailbox.into(),
-                                document_id: mailbox.mailbox_id,
-                                class: ValueClass::Property(Property::EmailIds.into()),
-                            })
+                    Status::UidNext => self
+                        .get_uid_next(&mailbox)
                         .await
-                            .caused_by(trc::location!())?
-                            + 1) as u64
-                    }
+                        .caused_by(trc::location!())? as u64,
                     Status::UidValidity => self
                         .server
                         .get_property::<Object<Value>>(