Fix JMAP: Email/query: Improper anchor handling

CHANGELOG.md

@@ -23,6 +23,7 @@ If you are upgrading from v0.16.x, replace the binary (or run `docker pull`). If
   - `*/set`: Unchanged immutable `id` property is rejected on update.
   - `*/query` and `*/queryChanges`: null` rejected as `notRequest`.
   - `Email/query`:
+    * Improper `anchor` handling.
     * Total miscount when `collapseThreads` is enabled.
     * Wrong sort order on `hasKeyword`, `allInThreadHaveKeyword`, and `someInThreadHaveKeyword` conditions.
     * Non-standard header values are not searchable.

crates/jmap-proto/src/method/query.rs

@@ -102,7 +102,9 @@ impl<'de, T: JmapObject> DeserializeArguments<'de> for QueryRequest<T> {
                 self.position = map.next_value()?;
             },
             b"anchor" => {
-                self.anchor = map.next_value()?;
+                self.anchor = map
+                    .next_value::<Option<crate::request::MaybeInvalid<Id>>>()?
+                    .map(|anchor| anchor.try_unwrap().unwrap_or(Id::from(u64::MAX)));
             },
             b"anchorOffset" => {
                 self.anchor_offset = map.next_value()?;

crates/jmap-proto/src/request/parser.rs

@@ -10,8 +10,7 @@ use super::{
 };
 use crate::request::{
     CopyRequestMethod, GetRequestMethod, ParseRequestMethod, QueryChangesRequestMethod,
-    QueryRequestMethod, SetRequestMethod,
-    deserialize::DeserializeArguments,
+    QueryRequestMethod, SetRequestMethod, deserialize::DeserializeArguments,
 };
 use serde::{
     Deserialize, Deserializer,

crates/jmap/src/api/query.rs

@@ -19,6 +19,7 @@ pub struct QueryResponseBuilder {
     anchor_offset: i32,
     pub has_anchor: bool,
     pub anchor_found: bool,
+    index: i32,
 
     pub response: QueryResponse,
 }
@@ -49,6 +50,7 @@ impl QueryResponseBuilder {
             anchor: request.anchor.map(|anchor| anchor.id()).unwrap_or(0),
             anchor_offset: request.anchor_offset.unwrap_or(0),
             anchor_found: false,
+            index: 0,
             response: QueryResponse {
                 account_id: request.account_id,
                 query_state,
@@ -91,30 +93,31 @@ impl QueryResponseBuilder {
             } else {
                 self.response.ids.push(id);
             }
-        } else if self.anchor_offset >= 0 {
-            if !self.anchor_found {
-                if id_u64 != self.anchor {
-                    return true;
-                }
+        } else {
+            let current_index = self.index;
+            self.index += 1;
+
+            if id_u64 == self.anchor {
                 self.anchor_found = true;
+                self.position = (current_index + self.anchor_offset).max(0);
             }
 
-            if self.anchor_offset > 0 {
-                self.anchor_offset -= 1;
+            if self.anchor_offset >= 0 {
+                if self.anchor_found && current_index >= self.position {
+                    self.response.ids.push(id);
+                    if self.limit > 0 && self.response.ids.len() == self.limit {
+                        return false;
+                    }
+                }
             } else {
                 self.response.ids.push(id);
-                if self.response.ids.len() == self.limit {
+                if self.anchor_found
+                    && self.limit > 0
+                    && self.response.ids.len() >= self.position as usize + self.limit
+                {
                     return false;
                 }
             }
-        } else {
-            self.anchor_found = id_u64 == self.anchor;
-            self.response.ids.push(id);
-
-            if self.anchor_found {
-                self.position = self.anchor_offset;
-                return false;
-            }
         }
 
         true
@@ -125,35 +128,49 @@ impl QueryResponseBuilder {
     }
 
     pub fn build(mut self) -> trc::Result<QueryResponse> {
-        if !self.has_anchor || self.anchor_found {
-            if !self.has_anchor && self.requested_position >= 0 {
-                self.response.position = if self.position == 0 {
-                    self.requested_position
-                } else {
-                    0
-                };
-            } else if self.position >= 0 {
-                self.response.position = self.position;
-            } else {
-                let position = self.position.unsigned_abs() as usize;
-                let start_offset = if position < self.response.ids.len() {
-                    self.response.ids.len() - position
-                } else {
-                    0
-                };
-                self.response.position = start_offset as i32;
-                let end_offset = if self.limit > 0 {
-                    std::cmp::min(start_offset + self.limit, self.response.ids.len())
+        if self.has_anchor {
+            if !self.anchor_found {
+                return Err(trc::JmapEvent::AnchorNotFound.into_err());
+            }
+
+            let start = self.position.max(0) as usize;
+            if self.anchor_offset < 0 {
+                let start = start.min(self.response.ids.len());
+                let end = if self.limit > 0 {
+                    std::cmp::min(start + self.limit, self.response.ids.len())
                 } else {
                     self.response.ids.len()
                 };
-
-                self.response.ids = self.response.ids[start_offset..end_offset].to_vec()
+                self.response.ids = self.response.ids[start..end].to_vec();
             }
+            self.response.position = start as i32;
 
-            Ok(self.response)
-        } else {
-            Err(trc::JmapEvent::AnchorNotFound.into_err())
+            return Ok(self.response);
         }
+
+        if self.requested_position >= 0 {
+            self.response.position = if self.position == 0 {
+                self.requested_position
+            } else {
+                0
+            };
+        } else {
+            let position = self.position.unsigned_abs() as usize;
+            let start_offset = if position < self.response.ids.len() {
+                self.response.ids.len() - position
+            } else {
+                0
+            };
+            self.response.position = start_offset as i32;
+            let end_offset = if self.limit > 0 {
+                std::cmp::min(start_offset + self.limit, self.response.ids.len())
+            } else {
+                self.response.ids.len()
+            };
+
+            self.response.ids = self.response.ids[start_offset..end_offset].to_vec();
+        }
+
+        Ok(self.response)
     }
 }

crates/jmap/src/changes/query.rs

@@ -151,7 +151,11 @@ impl QueryChanges for Server {
             }
             QueryChangesRequestMethod::FileNode(mut request) => {
                 // Query changes
-                resolve_account_id(&mut request.account_id, MethodObject::FileNode, access_token)?;
+                resolve_account_id(
+                    &mut request.account_id,
+                    MethodObject::FileNode,
+                    access_token,
+                )?;
                 changes = self
                     .changes(
                         build_changes_request(&request),

crates/store/src/search/local.rs

@@ -199,11 +199,9 @@ impl QueryResults {
             results.sort_by(|a, b| {
                 for comparator in &comparators {
                     let (a, b, is_ascending) = match comparator {
-                        SearchComparator::DocumentSet { set, ascending } => (
-                            set.contains(*a) as u32,
-                            set.contains(*b) as u32,
-                            *ascending,
-                        ),
+                        SearchComparator::DocumentSet { set, ascending } => {
+                            (set.contains(*a) as u32, set.contains(*b) as u32, *ascending)
+                        }
                         SearchComparator::SortedSet { set, ascending } => {
                             let missing = if *ascending { u32::MAX } else { 0 };
                             (