/**
 * 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.xml.security.test.dom.c14n.implementations;


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

import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathFactory;

import org.apache.xml.security.Init;
import org.apache.xml.security.c14n.Canonicalizer;
import org.apache.xml.security.test.dom.DSNamespaceContext;
import org.apache.xml.security.utils.XMLUtils;
import org.junit.jupiter.api.Test;
import org.w3c.dom.Document;
import org.w3c.dom.Node;

import static org.junit.jupiter.api.Assertions.assertEquals;

/**
 * This is a test for Santuario-273:
 *
 * https://issues.apache.org/jira/browse/SANTUARIO-273
 * "xml:base attribute not processed correctly in C14N11 canonicalization"
 */
class Santuario273Test {
    private static final String INPUT = ""
        + "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
        + "<Signature xmlns=\"http://www.w3.org/2000/09/xmldsig#\" xml:base=\"http://www.acme.com/resources/\">\n"
        + "  <SignedInfo xml:base=\"subresources/\"><!-- comment inside -->\n"
        + "    <CanonicalizationMethod Algorithm=\"http://www.w3.org/TR/2001/REC-xml-c14n-20010315\" />\n"
        + "    <SignatureMethod Algorithm=\"http://www.w3.org/2000/09/xmldsig#rsa-sha1\" />\n"
        + "    <Reference URI=\"http://www.w3.org/TR/xml-stylesheet\">\n"
        + "      <DigestMethod Algorithm=\"http://www.w3.org/2000/09/xmldsig#sha1\" />\n"
        + "      <DigestValue>60NvZvtdTB+7UnlLp/H24p7h4bs=</DigestValue>\n"
        + "    </Reference>\n"
        + "  </SignedInfo>\n"
        + "  <SignatureValue>\n"
        + "    fKMmy9GYF2s8rLFrZdVugTOFuWx19ccX7jh5HqFd4vMOY7LWAj52ykjSdvtW3fNY\n"
        + "    PPYGC4MFL19oPSId5GEsMtFMpGXB3XaCtoKjMCHQsN3+kom8YnGf7Ge1JNRcGty5\n"
        + "    0UsoP6Asj47+QR7QECT64uoziha4WRDVyXjDrg24W+U=\n"
        + "  </SignatureValue>\n"
        + "  <KeyInfo>\n"
        + "    <KeyName>Lugh</KeyName>\n"
        + "  </KeyInfo>\n"
        + "</Signature>\n"
        ;

    private static final String EXPECTED_RESULT = "<SignedInfo xmlns=\"http://www.w3.org/2000/09/xmldsig#\" xml:base=\"http://www.acme.com/resources/subresources/\">\n"
        + "    <CanonicalizationMethod Algorithm=\"http://www.w3.org/TR/2001/REC-xml-c14n-20010315\"></CanonicalizationMethod>\n"
        + "    <SignatureMethod Algorithm=\"http://www.w3.org/2000/09/xmldsig#rsa-sha1\"></SignatureMethod>\n"
        + "    <Reference URI=\"http://www.w3.org/TR/xml-stylesheet\">\n"
        + "      <DigestMethod Algorithm=\"http://www.w3.org/2000/09/xmldsig#sha1\"></DigestMethod>\n"
        + "      <DigestValue>60NvZvtdTB+7UnlLp/H24p7h4bs=</DigestValue>\n"
        + "    </Reference>\n"
        + "  </SignedInfo>";

    static {
        Init.init();
    }

    @Test
    void testC14n11Base() throws Exception {
        Document doc = null;
        try (InputStream is = new ByteArrayInputStream(INPUT.getBytes())) {
            doc = XMLUtils.read(is, false);
        }

        Canonicalizer c14n =
            Canonicalizer.getInstance(Canonicalizer.ALGO_ID_C14N11_OMIT_COMMENTS);

        XPathFactory xpf = XPathFactory.newInstance();
        XPath xPath = xpf.newXPath();
        xPath.setNamespaceContext(new DSNamespaceContext());

        Node signedInfo =
            (Node) xPath.evaluate("//ds:SignedInfo[1]", doc, XPathConstants.NODE);
        try (ByteArrayOutputStream output = new ByteArrayOutputStream()) {
            c14n.canonicalizeSubtree(signedInfo, output);

            assertEquals(new String(output.toByteArray(), java.nio.charset.StandardCharsets.UTF_8), EXPECTED_RESULT);
        }
    }

}