Support the backwards compatibility features in MSC3952. (#14958)

If the feature is enabled and the event has a `m.mentions` property,
skip processing of the legacy mentions rules.

2 files changed, 23 insertions, 0 deletions

diff --git a/rust/benches/evaluator.rs b/rust/benches/evaluator.rs

index 6b16a3f75b..859d54961c 100644
--- a/rust/benches/evaluator.rs
+++ b/rust/benches/evaluator.rs
@@ -33,6 +33,7 @@ fn bench_match_exact(b: &mut Bencher) {
 
     let eval = PushRuleEvaluator::py_new(
         flattened_keys,
+        false,
         BTreeSet::new(),
         false,
         10,
@@ -71,6 +72,7 @@ fn bench_match_word(b: &mut Bencher) {
 
     let eval = PushRuleEvaluator::py_new(
         flattened_keys,
+        false,
         BTreeSet::new(),
         false,
         10,
@@ -109,6 +111,7 @@ fn bench_match_word_miss(b: &mut Bencher) {
 
     let eval = PushRuleEvaluator::py_new(
         flattened_keys,
+        false,
         BTreeSet::new(),
         false,
         10,
@@ -147,6 +150,7 @@ fn bench_eval_message(b: &mut Bencher) {
 
     let eval = PushRuleEvaluator::py_new(
         flattened_keys,
+        false,
         BTreeSet::new(),
         false,
         10,
diff --git a/rust/src/push/evaluator.rs b/rust/src/push/evaluator.rs

index aa71202e43..da6f704c0e 100644
--- a/rust/src/push/evaluator.rs
+++ b/rust/src/push/evaluator.rs
@@ -68,6 +68,8 @@ pub struct PushRuleEvaluator {
     /// The "content.body", if any.
     body: String,
 
+    /// True if the event has a mentions property and MSC3952 support is enabled.
+    has_mentions: bool,
     /// The user mentions that were part of the message.
     user_mentions: BTreeSet<String>,
     /// True if the message is a room message.
@@ -105,6 +107,7 @@ impl PushRuleEvaluator {
     #[new]
     pub fn py_new(
         flattened_keys: BTreeMap<String, String>,
+        has_mentions: bool,
         user_mentions: BTreeSet<String>,
         room_mention: bool,
         room_member_count: u64,
@@ -123,6 +126,7 @@ impl PushRuleEvaluator {
         Ok(PushRuleEvaluator {
             flattened_keys,
             body,
+            has_mentions,
             user_mentions,
             room_mention,
             room_member_count,
@@ -155,6 +159,19 @@ impl PushRuleEvaluator {
             }
 
             let rule_id = &push_rule.rule_id().to_string();
+
+            // For backwards-compatibility the legacy mention rules are disabled
+            // if the event contains the 'm.mentions' property (and if the
+            // experimental feature is enabled, both of these are represented
+            // by the has_mentions flag).
+            if self.has_mentions
+                && (rule_id == "global/override/.m.rule.contains_display_name"
+                    || rule_id == "global/content/.m.rule.contains_user_name"
+                    || rule_id == "global/override/.m.rule.roomnotif")
+            {
+                continue;
+            }
+
             let extev_flag = &RoomVersionFeatures::ExtensibleEvents.as_str().to_string();
             let supports_extensible_events = self.room_version_feature_flags.contains(extev_flag);
             let safe_from_rver_condition = SAFE_EXTENSIBLE_EVENTS_RULE_IDS.contains(rule_id);
@@ -441,6 +458,7 @@ fn push_rule_evaluator() {
     flattened_keys.insert("content.body".to_string(), "foo bar bob hello".to_string());
     let evaluator = PushRuleEvaluator::py_new(
         flattened_keys,
+        false,
         BTreeSet::new(),
         false,
         10,
@@ -468,6 +486,7 @@ fn test_requires_room_version_supports_condition() {
     let flags = vec![RoomVersionFeatures::ExtensibleEvents.as_str().to_string()];
     let evaluator = PushRuleEvaluator::py_new(
         flattened_keys,
+        false,
         BTreeSet::new(),
         false,
         10,