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Reject MIME type parameters differing only in case #37008

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Reject MIME type parameters differing only in case #37008

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6 changes: 4 additions & 2 deletions spring-core/src/main/java/org/springframework/util/MimeTypeUtils.java
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Original file line number Diff line number Diff line change
Expand Up @@ -23,8 +23,8 @@
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Random;
import java.util.function.BiPredicate;
Expand Down Expand Up @@ -437,7 +437,9 @@ private void resolveBareType(String candidate) {

private void putParameter(String name, String value) {
if (this.parameters == null) {
this.parameters = new LinkedHashMap<>(4);
// Parameter names are case-insensitive, so use a case-insensitive
// map in order to reject duplicates that differ only in case.
this.parameters = new LinkedCaseInsensitiveMap<>(4, Locale.ROOT);
}
if (this.parameters.put(name, value) != null) {
throw new InvalidMimeTypeException(this.input, "duplicate parameter '" + name + "=" + value + "'");
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6 changes: 6 additions & 0 deletions spring-core/src/test/java/org/springframework/util/MimeTypeTests.java
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Expand Up @@ -174,6 +174,12 @@ void valueOfDuplicateParameter() {
.hasMessageContaining("Invalid mime type \"text/plain;dupe=\"1\";dupe=\"2\"\": duplicate parameter 'dupe=\"2\"'");
}

@Test
void valueOfDuplicateParameterWithDifferentCase() {
assertThatThrownBy(() -> MimeType.valueOf("text/plain;dupe=\"1\";DUPE=\"2\"")).isInstanceOf(InvalidMimeTypeException.class)
.hasMessageContaining("Invalid mime type \"text/plain;dupe=\"1\";DUPE=\"2\"\": duplicate parameter 'DUPE=\"2\"'");
}

}


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