/*
 * Copyright 2010-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed 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://aws.amazon.com/apache2.0
 *
 * This file 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 com.amazonaws.util;

import static org.junit.Assert.assertEquals;

import org.apache.commons.io.IOUtils;
import org.junit.Test;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

/**
 * Test for filtering out XML namespace attributes when reading XML.
 */
public class NamespaceRemovingInputStreamTest {

    private static final String SAMPLE_RESPONSE_1 =
            "<DomainMetadataResponse xmlns=\"http://sdb.amazonaws.com/doc/2009-04-15/\">\n" +
                    "  <DomainMetadataResult>\n" +
                    "    <ItemCount>195078</ItemCount>\n" +
                    "  </DomainMetadataResult>\n" +
                    "  <ResponseMetadata>\n" +
                    "        <RequestId>b1e8f1f7-42e9-494c-ad09-2674e557526d</RequestId>\n" +
                    "  </ResponseMetadata>\n" +
                    "</DomainMetadataResponse>";

    private static final String SAMPLE_RESPONSE_2 =
            "<DomainMetadataResponse xmlns = \"http://sdb.amazonaws.com/doc/2009-04-15/\">\n" +
                    "  <DomainMetadataResult>\n" +
                    "    <ItemCount>195078</ItemCount>\n" +
                    "  </DomainMetadataResult>\n" +
                    "  <ResponseMetadata>\n" +
                    "        <RequestId>b1e8f1f7-42e9-494c-ad09-2674e557526d</RequestId>\n" +
                    "  </ResponseMetadata>\n" +
                    "</DomainMetadataResponse>";

    private static final String SAMPLE_RESPONSE_3 =
            "<DomainMetadataResponse xmlns=  \"http://sdb.amazonaws.com/doc/2009-04-15/\">\n" +
                    "  <DomainMetadataResult>\n" +
                    "    <ItemCount>195078</ItemCount>\n" +
                    "  </DomainMetadataResult>\n" +
                    "  <ResponseMetadata>\n" +
                    "        <RequestId>b1e8f1f7-42e9-494c-ad09-2674e557526d</RequestId>\n" +
                    "  </ResponseMetadata>\n" +
                    "</DomainMetadataResponse>";

    private static final String EXPECTED_RESULT =
            "<DomainMetadataResponse >\n" +
                    "  <DomainMetadataResult>\n" +
                    "    <ItemCount>195078</ItemCount>\n" +
                    "  </DomainMetadataResult>\n" +
                    "  <ResponseMetadata>\n" +
                    "        <RequestId>b1e8f1f7-42e9-494c-ad09-2674e557526d</RequestId>\n" +
                    "  </ResponseMetadata>\n" +
                    "</DomainMetadataResponse>";

    @Test
    public void testNamespaceRemoval() throws Exception {
        assertEquals(EXPECTED_RESULT, removeNamespace(SAMPLE_RESPONSE_1));
        assertEquals(EXPECTED_RESULT, removeNamespace(SAMPLE_RESPONSE_2));
        assertEquals(EXPECTED_RESULT, removeNamespace(SAMPLE_RESPONSE_3));
    }

    private String removeNamespace(String xml) throws Exception {
        NamespaceRemovingInputStream inputStream = new NamespaceRemovingInputStream(
                new ByteArrayInputStream(xml.getBytes(StringUtils.UTF8)));
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        IOUtils.copy(inputStream, outputStream);

        return new String(outputStream.toByteArray(), StringUtils.UTF8);
    }
}