Push rule evaluation tweaks (#2897)

This tweaks push rule evaluation:

1. to be more strict around pattern matching and to not match empty
patterns
3. to bail if we come across a `dont_notify`, since cycles after that
are wasted
4. refactors `ActionsToTweaks` to make a bit more sense
This commit is contained in:
Neil Alexander 2022-11-30 12:54:37 +00:00 committed by GitHub
parent ac5f3f025e
commit f009e54181
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 39 additions and 19 deletions

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@ -145,6 +145,11 @@ func conditionMatches(cond *Condition, event *gomatrixserverlib.Event, ec Evalua
} }
func patternMatches(key, pattern string, event *gomatrixserverlib.Event) (bool, error) { func patternMatches(key, pattern string, event *gomatrixserverlib.Event) (bool, error) {
// It doesn't make sense for an empty pattern to match anything.
if pattern == "" {
return false, nil
}
re, err := globToRegexp(pattern) re, err := globToRegexp(pattern)
if err != nil { if err != nil {
return false, err return false, err
@ -154,12 +159,20 @@ func patternMatches(key, pattern string, event *gomatrixserverlib.Event) (bool,
if err = json.Unmarshal(event.JSON(), &eventMap); err != nil { if err = json.Unmarshal(event.JSON(), &eventMap); err != nil {
return false, fmt.Errorf("parsing event: %w", err) return false, fmt.Errorf("parsing event: %w", err)
} }
// From the spec:
// "If the property specified by key is completely absent from
// the event, or does not have a string value, then the condition
// will not match, even if pattern is *."
v, err := lookupMapPath(strings.Split(key, "."), eventMap) v, err := lookupMapPath(strings.Split(key, "."), eventMap)
if err != nil { if err != nil {
// An unknown path is a benign error that shouldn't stop rule // An unknown path is a benign error that shouldn't stop rule
// processing. It's just a non-match. // processing. It's just a non-match.
return false, nil return false, nil
} }
if _, ok := v.(string); !ok {
// A non-string never matches.
return false, nil
}
return re.MatchString(fmt.Sprint(v)), nil return re.MatchString(fmt.Sprint(v)), nil
} }

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@ -111,7 +111,10 @@ func TestConditionMatches(t *testing.T) {
{"empty", Condition{}, `{}`, false}, {"empty", Condition{}, `{}`, false},
{"empty", Condition{Kind: "unknownstring"}, `{}`, false}, {"empty", Condition{Kind: "unknownstring"}, `{}`, false},
{"eventMatch", Condition{Kind: EventMatchCondition, Key: "content"}, `{"content":{}}`, true}, // Neither of these should match because `content` is not a full string match,
// and `content.body` is not a string value.
{"eventMatch", Condition{Kind: EventMatchCondition, Key: "content"}, `{"content":{}}`, false},
{"eventBodyMatch", Condition{Kind: EventMatchCondition, Key: "content.body", Is: "3"}, `{"content":{"body": 3}}`, false},
{"displayNameNoMatch", Condition{Kind: ContainsDisplayNameCondition}, `{"content":{"body":"something without displayname"}}`, false}, {"displayNameNoMatch", Condition{Kind: ContainsDisplayNameCondition}, `{"content":{"body":"something without displayname"}}`, false},
{"displayNameMatch", Condition{Kind: ContainsDisplayNameCondition}, `{"content":{"body":"hello Dear User, how are you?"}}`, true}, {"displayNameMatch", Condition{Kind: ContainsDisplayNameCondition}, `{"content":{"body":"hello Dear User, how are you?"}}`, true},
@ -137,7 +140,7 @@ func TestConditionMatches(t *testing.T) {
t.Fatalf("conditionMatches failed: %v", err) t.Fatalf("conditionMatches failed: %v", err)
} }
if got != tst.Want { if got != tst.Want {
t.Errorf("conditionMatches: got %v, want %v", got, tst.Want) t.Errorf("conditionMatches: got %v, want %v on %s", got, tst.Want, tst.Name)
} }
}) })
} }
@ -161,9 +164,7 @@ func TestPatternMatches(t *testing.T) {
}{ }{
{"empty", "", "", `{}`, false}, {"empty", "", "", `{}`, false},
// Note that an empty pattern contains no wildcard characters, {"patternEmpty", "content", "", `{"content":{}}`, false},
// which implicitly means "*".
{"patternEmpty", "content", "", `{"content":{}}`, true},
{"literal", "content.creator", "acreator", `{"content":{"creator":"acreator"}}`, true}, {"literal", "content.creator", "acreator", `{"content":{"creator":"acreator"}}`, true},
{"substring", "content.creator", "reat", `{"content":{"creator":"acreator"}}`, true}, {"substring", "content.creator", "reat", `{"content":{"creator":"acreator"}}`, true},
@ -178,7 +179,7 @@ func TestPatternMatches(t *testing.T) {
t.Fatalf("patternMatches failed: %v", err) t.Fatalf("patternMatches failed: %v", err)
} }
if got != tst.Want { if got != tst.Want {
t.Errorf("patternMatches: got %v, want %v", got, tst.Want) t.Errorf("patternMatches: got %v, want %v on %s", got, tst.Want, tst.Name)
} }
}) })
} }

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@ -11,22 +11,27 @@ import (
// kind and a tweaks map. Returns a nil map if it would have been // kind and a tweaks map. Returns a nil map if it would have been
// empty. // empty.
func ActionsToTweaks(as []*Action) (ActionKind, map[string]interface{}, error) { func ActionsToTweaks(as []*Action) (ActionKind, map[string]interface{}, error) {
kind := UnknownAction var kind ActionKind
tweaks := map[string]interface{}{} var tweaks map[string]interface{}
for _, a := range as { for _, a := range as {
if a.Kind == SetTweakAction { switch a.Kind {
tweaks[string(a.Tweak)] = a.Value case DontNotifyAction:
continue // Don't bother processing any further
} return DontNotifyAction, nil, nil
if kind != UnknownAction {
return UnknownAction, nil, fmt.Errorf("got multiple primary actions: already had %q, got %s", kind, a.Kind)
}
kind = a.Kind
}
if len(tweaks) == 0 { case SetTweakAction:
tweaks = nil if tweaks == nil {
tweaks = map[string]interface{}{}
}
tweaks[string(a.Tweak)] = a.Value
default:
if kind != UnknownAction {
return UnknownAction, nil, fmt.Errorf("got multiple primary actions: already had %q, got %s", kind, a.Kind)
}
kind = a.Kind
}
} }
return kind, tweaks, nil return kind, tweaks, nil

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@ -17,6 +17,7 @@ func TestActionsToTweaks(t *testing.T) {
{"empty", nil, UnknownAction, nil}, {"empty", nil, UnknownAction, nil},
{"zero", []*Action{{}}, UnknownAction, nil}, {"zero", []*Action{{}}, UnknownAction, nil},
{"onlyPrimary", []*Action{{Kind: NotifyAction}}, NotifyAction, nil}, {"onlyPrimary", []*Action{{Kind: NotifyAction}}, NotifyAction, nil},
{"onlyPrimaryDontNotify", []*Action{{Kind: DontNotifyAction}}, DontNotifyAction, nil},
{"onlyTweak", []*Action{{Kind: SetTweakAction, Tweak: HighlightTweak}}, UnknownAction, map[string]interface{}{"highlight": nil}}, {"onlyTweak", []*Action{{Kind: SetTweakAction, Tweak: HighlightTweak}}, UnknownAction, map[string]interface{}{"highlight": nil}},
{"onlyTweakWithValue", []*Action{{Kind: SetTweakAction, Tweak: SoundTweak, Value: "default"}}, UnknownAction, map[string]interface{}{"sound": "default"}}, {"onlyTweakWithValue", []*Action{{Kind: SetTweakAction, Tweak: SoundTweak, Value: "default"}}, UnknownAction, map[string]interface{}{"sound": "default"}},
{ {