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[FIXED] Fix panic when subject transform has missing tokens #6612

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Merged
derekcollison merged 1 commit into from
Mar 7, 2025
Merged

[FIXED] Fix panic when subject transform has missing tokens #6612

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11 changes: 10 additions & 1 deletion server/subject_transform.go
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Original file line number Diff line number Diff line change
Expand Up @@ -459,7 +459,16 @@ func (tr *subjectTransform) TransformTokenizedSubject(tokens []string) string {
}
b.WriteString(tr.getHashPartition(keyForHashing, int(tr.dtokmfintargs[i])))
case Wildcard: // simple substitution
b.WriteString(tokens[tr.dtokmftokindexesargs[i][0]])
switch {
case len(tr.dtokmftokindexesargs) < i:
break
case len(tr.dtokmftokindexesargs[i]) < 1:
break
case len(tokens) <= tr.dtokmftokindexesargs[i][0]:
break
default:
b.WriteString(tokens[tr.dtokmftokindexesargs[i][0]])
}
case SplitFromLeft:
sourceToken := tokens[tr.dtokmftokindexesargs[i][0]]
sourceTokenLen := len(sourceToken)
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11 changes: 11 additions & 0 deletions server/subject_transform_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -221,3 +221,14 @@ func TestSubjectTransforms(t *testing.T) {
shouldMatch("*", "{{left(1,3)}}", "1234", "123")
shouldMatch("*", "{{left(1,6)}}", "1234", "1234")
}

func TestSubjectTransformDoesntPanicTransformingMissingToken(t *testing.T) {
defer func() {
p := recover()
require_True(t, p == nil)
}()

tr, err := NewSubjectTransform("foo.*", "one.two.{{wildcard(1)}}")
require_NoError(t, err)
require_Equal(t, tr.TransformTokenizedSubject([]string{"foo"}), "one.two.")
}