/*
    * 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.commons.fileupload2.core;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.io.UnsupportedEncodingException;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * The expected characters are encoded in UTF16, while the actual characters may be encoded in UTF-8/ISO-8859-1
   *
   * RFC 5987 recommends to support both UTF-8 and ISO 8859-1. Test values are taken from https://tools.ietf.org/html/rfc5987#section-3.2.2
   */
  public final class RFC2231UtilityTestCase {
  
      private static void assertEncoded(final String expected, final String encoded) throws Exception {
          assertEquals(expected, RFC2231Utils.decodeText(encoded));
      }
  
      @Test
      public void testDecodeInvalidEncoding() throws Exception {
          assertThrows(UnsupportedEncodingException.class, () -> RFC2231Utils.decodeText("abc'en'hello"));
      }
  
      @Test
      public void testDecodeIso88591() throws Exception {
          assertEncoded("\u00A3 rate", "iso-8859-1'en'%A3%20rate"); // "£ rate"
      }
  
      @Test
      public void testDecodeUtf8() throws Exception {
          assertEncoded("\u00a3 \u0061\u006e\u0064 \u20ac \u0072\u0061\u0074\u0065\u0073", "UTF-8''%c2%a3%20and%20%e2%82%ac%20rates"); // "£ and € rates"
      }
  
      @Test
      public void testHasEncodedValue() {
          final var nameWithAsteriskAtEnd = "paramname*";
          assertTrue(RFC2231Utils.hasEncodedValue(nameWithAsteriskAtEnd));
  
          final var nameWithAsteriskNotAtEnd = "param*name";
          assertFalse(RFC2231Utils.hasEncodedValue(nameWithAsteriskNotAtEnd));
  
          final var nameWithoutAsterisk = "paramname";
          assertFalse(RFC2231Utils.hasEncodedValue(nameWithoutAsterisk));
      }
  
      @Test
      public void testNoNeedToDecode() throws Exception {
          assertEncoded("abc", "abc");
      }
  
      @Test
      public void testStripDelimiter() {
          final var nameWithAsteriskAtEnd = "paramname*";
          assertEquals("paramname", RFC2231Utils.stripDelimiter(nameWithAsteriskAtEnd));
  
          final var nameWithAsteriskNotAtEnd = "param*name";
          assertEquals("param*name", RFC2231Utils.stripDelimiter(nameWithAsteriskNotAtEnd));
  
          final var nameWithTwoAsterisks = "param*name*";
          assertEquals("param*name", RFC2231Utils.stripDelimiter(nameWithTwoAsterisks));
  
          final var nameWithoutAsterisk = "paramname";
          assertEquals("paramname", RFC2231Utils.stripDelimiter(nameWithoutAsterisk));
      }
  }