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test/org/apache/tomcat/util/buf/TestUDecoder.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.tomcat.util.buf;
+
+import java.nio.charset.StandardCharsets;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestUDecoder {
+
+    @Test
+    public void testURLDecodeStringInvalid() {
+        // %n rather than %nn should throw an IAE according to the Javadoc
+        Exception exception = null;
+        try {
+            UDecoder.URLDecode("%5xxxxx");
+        } catch (Exception e) {
+            exception = e;
+        }
+        Assert.assertTrue(exception instanceof IllegalArgumentException);
+
+        // Edge case trying to trigger ArrayIndexOutOfBoundsException
+        exception = null;
+        try {
+            UDecoder.URLDecode("%5");
+        } catch (Exception e) {
+            exception = e;
+        }
+        Assert.assertTrue(exception instanceof IllegalArgumentException);
+    }
+
+
+    @Test
+    public void testURLDecodeStringValidIso88591Start() {
+        String result = UDecoder.URLDecode("%41xxxx", StandardCharsets.ISO_8859_1);
+        Assert.assertEquals("Axxxx", result);
+    }
+
+
+    @Test
+    public void testURLDecodeStringValidIso88591Middle() {
+        String result = UDecoder.URLDecode("xx%41xx", StandardCharsets.ISO_8859_1);
+        Assert.assertEquals("xxAxx", result);
+    }
+
+
+    @Test
+    public void testURLDecodeStringValidIso88591End() {
+        String result = UDecoder.URLDecode("xxxx%41", StandardCharsets.ISO_8859_1);
+        Assert.assertEquals("xxxxA", result);
+    }
+
+
+    @Test
+    public void testURLDecodeStringValidUtf8Start() {
+        String result = UDecoder.URLDecode("%c3%aaxxxx", StandardCharsets.UTF_8);
+        Assert.assertEquals("\u00eaxxxx", result);
+    }
+
+
+    @Test
+    public void testURLDecodeStringValidUtf8Middle() {
+        String result = UDecoder.URLDecode("xx%c3%aaxx", StandardCharsets.UTF_8);
+        Assert.assertEquals("xx\u00eaxx", result);
+    }
+
+
+    @Test
+    public void testURLDecodeStringValidUtf8End() {
+        String result = UDecoder.URLDecode("xxxx%c3%aa", StandardCharsets.UTF_8);
+        Assert.assertEquals("xxxx\u00ea", result);
+    }
+
+
+    @Test
+    public void testURLDecodeStringNonAsciiValidNone() {
+        String result = UDecoder.URLDecode("\u00eaxxxx", StandardCharsets.UTF_8);
+        Assert.assertEquals("\u00eaxxxx", result);
+    }
+
+
+    @Test
+    public void testURLDecodeStringNonAsciiValidUtf8() {
+        String result = UDecoder.URLDecode("\u00ea%c3%aa", StandardCharsets.UTF_8);
+        Assert.assertEquals("\u00ea\u00ea", result);
+    }
+}