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fix ArrayIndexOutOfBoundsException in DnsStringLookup for '|' key #765

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fix ArrayIndexOutOfBoundsException in DnsStringLookup for '|' key #765

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3 changes: 3 additions & 0 deletions src/main/java/org/apache/commons/text/lookup/DnsStringLookup.java
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Original file line number Diff line number Diff line change
Expand Up @@ -87,6 +87,9 @@ public String lookup(final String key) {
}
final String[] keys = key.trim().split("\\|");
final int keyLen = keys.length;
if (keyLen == 0) {
return null;
}
final String subKey = keys[0].trim();
final String subValue = keyLen < 2 ? key : keys[1].trim();
try {
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8 changes: 8 additions & 0 deletions src/test/java/org/apache/commons/text/lookup/DnsStringLookupTest.java
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Expand Up @@ -73,6 +73,14 @@ void testName() throws UnknownHostException {
assertTrue(matched);
}

@Test
void testDelimiterOnlyKey() {
// A key that is only delimiter/whitespace splits to an empty array; must not throw.
assertNull(DnsStringLookup.INSTANCE.apply("|"));
assertNull(DnsStringLookup.INSTANCE.apply("||"));
assertNull(DnsStringLookup.INSTANCE.apply(" | "));
}

@Test
void testNull() {
assertNull(DnsStringLookup.INSTANCE.apply(null));
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