src/imap/capability.rs

@@ -1,9 +1,11 @@
-use imap_codec::imap_types::command::SelectExamineModifier;
+use imap_codec::imap_types::command::{FetchModifier, StoreModifier, SelectExamineModifier};
 use imap_codec::imap_types::core::NonEmptyVec;
 use imap_codec::imap_types::extensions::enable::{CapabilityEnable, Utf8Kind};
 use imap_codec::imap_types::response::Capability;
 use std::collections::HashSet;
 
+use crate::imap::attributes::AttributesProxy;
+
 fn capability_unselect() -> Capability<'static> {
     Capability::try_from("UNSELECT").unwrap()
 }
@@ -91,6 +93,24 @@ impl ClientCapability {
         self.condstore = self.condstore.enable();
     }
 
+    pub fn attributes_enable(&mut self, ap: &AttributesProxy) {
+        if ap.is_enabling_condstore() {
+            self.enable_condstore()
+        }
+    }
+
+    pub fn fetch_modifiers_enable(&mut self, mods: &[FetchModifier]) {
+        if mods.iter().any(|x| matches!(x, FetchModifier::ChangedSince(..))) {
+            self.enable_condstore()
+        }
+    }
+
+    pub fn store_modifiers_enable(&mut self, mods: &[StoreModifier]) {
+        if mods.iter().any(|x| matches!(x, StoreModifier::UnchangedSince(..))) {
+            self.enable_condstore()
+        }
+    }
+
     pub fn select_enable(&mut self, mods: &[SelectExamineModifier]) {
         for m in mods.iter() {
             match m {

src/imap/command/examined.rs

@@ -7,6 +7,7 @@ use imap_codec::imap_types::fetch::MacroOrMessageDataItemNames;
 use imap_codec::imap_types::search::SearchKey;
 use imap_codec::imap_types::sequence::SequenceSet;
 
+use crate::imap::attributes::AttributesProxy;
 use crate::imap::capability::{ClientCapability, ServerCapability};
 use crate::imap::command::{anystate, authenticated};
 use crate::imap::flow;
@@ -92,11 +93,15 @@ impl<'a> ExaminedContext<'a> {
         modifiers: &[FetchModifier],
         uid: &bool,
     ) -> Result<(Response<'static>, flow::Transition)> {
-        match self.mailbox.fetch(sequence_set, attributes, uid).await {
-            Ok((resp, enable_condstore)) => {
-                if enable_condstore {
-                    self.client_capabilities.enable_condstore();
-                }
+        let ap = AttributesProxy::new(attributes, *uid);
+
+        match self.mailbox.fetch(sequence_set, &ap, uid).await {
+            Ok(resp) => {
+                // Capabilities enabling logic only on successful command
+                // (according to my understanding of the spec)
+                self.client_capabilities.attributes_enable(&ap);
+                self.client_capabilities.fetch_modifiers_enable(modifiers);
+
                 Ok((
                     Response::build()
                         .to_req(self.req)

src/imap/command/selected.rs

@@ -15,7 +15,7 @@ use crate::imap::command::{anystate, authenticated, MailboxName};
 use crate::imap::flow;
 use crate::imap::mailbox_view::MailboxView;
 use crate::imap::response::Response;
-
+use crate::imap::attributes::AttributesProxy;
 use crate::mail::user::User;
 
 pub struct SelectedContext<'a> {
@@ -118,11 +118,16 @@ impl<'a> SelectedContext<'a> {
         modifiers: &[FetchModifier],
         uid: &bool,
     ) -> Result<(Response<'static>, flow::Transition)> {
-        match self.mailbox.fetch(sequence_set, attributes, uid).await {
-            Ok((resp, enable_condstore)) => {
-                if enable_condstore {
-                    self.client_capabilities.enable_condstore();
-                }
+        let ap = AttributesProxy::new(attributes, *uid);
+
+        match self.mailbox.fetch(sequence_set, &ap, uid).await {
+            Ok(resp) => {
+                // Capabilities enabling logic only on successful command
+                // (according to my understanding of the spec)
+                self.client_capabilities.attributes_enable(&ap);
+                self.client_capabilities.fetch_modifiers_enable(modifiers);
+
+                // Response to the client
                 Ok((
                     Response::build()
                         .to_req(self.req)
@@ -199,12 +204,13 @@ impl<'a> SelectedContext<'a> {
         modifiers: &[StoreModifier],
         uid: &bool,
     ) -> Result<(Response<'static>, flow::Transition)> {
-        tracing::info!(modifiers=?modifiers);
         let data = self
             .mailbox
             .store(sequence_set, kind, response, flags, uid)
             .await?;
 
+        self.client_capabilities.store_modifiers_enable(modifiers);
+
         Ok((
             Response::build()
                 .to_req(self.req)

src/imap/mailbox_view.rs

@@ -6,7 +6,7 @@ use anyhow::{anyhow, Error, Result};
 use futures::stream::{FuturesOrdered, StreamExt};
 
 use imap_codec::imap_types::core::Charset;
-use imap_codec::imap_types::fetch::{MacroOrMessageDataItemNames, MessageDataItem};
+use imap_codec::imap_types::fetch::MessageDataItem;
 use imap_codec::imap_types::flag::{Flag, FlagFetch, FlagPerm, StoreResponse, StoreType};
 use imap_codec::imap_types::response::{Code, CodeOther, Data, Status};
 use imap_codec::imap_types::search::SearchKey;
@@ -257,13 +257,13 @@ impl MailboxView {
     pub async fn fetch<'b>(
         &self,
         sequence_set: &SequenceSet,
-        attributes: &'b MacroOrMessageDataItemNames<'static>,
+        ap: &AttributesProxy,
         is_uid_fetch: &bool,
-    ) -> Result<(Vec<Body<'static>>, bool)> {
+    ) -> Result<Vec<Body<'static>>> {
         // [1/6] Pre-compute data
         //  a. what are the uuids of the emails we want?
         //  b. do we need to fetch the full body?
-        let ap = AttributesProxy::new(attributes, *is_uid_fetch);
+        //let ap = AttributesProxy::new(attributes, *is_uid_fetch);
         let query_scope = match ap.need_body() {
             true => QueryScope::Full,
             _ => QueryScope::Partial,
@@ -316,7 +316,7 @@ impl MailboxView {
             .collect::<Result<_, _>>()?;
 
         // [6/6] Build the final result that will be sent to the client.
-        Ok((imap_ret, ap.is_enabling_condstore()))
+        Ok(imap_ret)
     }
 
     /// A naive search implementation...