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/*
 * Copyright (c) 2010, 2022 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.xml.wss.impl.c14n;

import java.nio.charset.StandardCharsets;
import java.util.Vector;
import java.util.Iterator;
import java.util.StringTokenizer;

import jakarta.xml.soap.MimeHeader;

import com.sun.xml.wss.swa.MimeConstants;
import com.sun.xml.wss.XWSSecurityException;
import java.io.InputStream;
import java.io.OutputStream;

import java.util.ArrayList;
import java.util.List;
import jakarta.mail.internet.MimeUtility;

public class MimeHeaderCanonicalizer extends Canonicalizer {

    public MimeHeaderCanonicalizer() {}

    @Override
    public byte[] canonicalize(byte[] input) {
        return null;
    }

    @Override
    public InputStream canonicalize(InputStream input, OutputStream outputStream)
    throws javax.xml.crypto.dsig.TransformException   {
        throw new UnsupportedOperationException();
    }
    @SuppressWarnings("unchecked")
    public byte[] _canonicalize(Iterator mimeHeaders /* internal class, therefore ok */)
    throws XWSSecurityException {
        String _mh = "";
        List mimeHeaderList = new ArrayList();
        while(mimeHeaders.hasNext()){
            mimeHeaderList.add(mimeHeaders.next());
        }

        // rf. steps 2-10 Section 4.3.1 SwA Draft 13
        // SAAJ RI returns trimmed (at start) Content-Description values
        // Unstructured MIME Headers can be RFC2047 encoded, step 6
        // Unfold, step 5; Uncomment, step 8; Steps 9-16 not applicable
        String cDescription = getMatchingHeader(mimeHeaderList, MimeConstants.CONTENT_DESCRIPTION);
        if (cDescription != null) {
            _mh += MimeConstants.CONTENT_DESCRIPTION + _CL;
            _mh += uncomment(rfc2047decode(unfold(cDescription)));
            _mh += _CRLF;
        }

        // Unfold, step 5; unfold WSP, step 7;
        String cDisposition = getMatchingHeader(mimeHeaderList, MimeConstants.CONTENT_DISPOSITION);
        if (cDisposition != null) {
            _mh += MimeConstants.CONTENT_DISPOSITION + _CL;
            _mh += canonicalizeHeaderLine(uncomment(unfold(cDisposition)), true);
            _mh += _CRLF;
        }

        // Unfold, step 5; unfold WSP, step 7;
        String cId = getMatchingHeader(mimeHeaderList, MimeConstants.CONTENT_ID);
        if (cId != null) {
            _mh += MimeConstants.CONTENT_ID + _CL;
            _mh += unfoldWS(uncomment(unfold(cId))).trim();
            _mh += _CRLF;
        }

        // Unfold, step 5; unfold WSP, step 7;
        String cLocation = getMatchingHeader(mimeHeaderList, MimeConstants.CONTENT_LOCATION);
        if (cLocation != null) {
            _mh += MimeConstants.CONTENT_LOCATION + _CL;
            _mh += unfoldWS(uncomment(unfold(cLocation))).trim();
            _mh += _CRLF;
        }

        // Unfold, step 5; unfold WSP, step 7;
        String cType = getMatchingHeader(mimeHeaderList, MimeConstants.CONTENT_TYPE);
        cType = (cType == null) ? "text/plain; charset=us-ascii" : cType;

        _mh += MimeConstants.CONTENT_TYPE + _CL;
        _mh += canonicalizeHeaderLine(uncomment(unfold(cType)), true);
        _mh += _CRLF;

        _mh += _CRLF; // step 17

        byte[] b = null;
        try {
            b = _mh.getBytes(StandardCharsets.UTF_8);
        } catch (Exception e) {
            // log
            throw new XWSSecurityException(e);
        }

        return b;
    }

    private String getMatchingHeader(List mimeHeaders, String key) throws XWSSecurityException {
        String header_line = null;
        try {
            for (int i=0; i v = new Vector<>();

        StringTokenizer nzr = new StringTokenizer(input, _SC);
        while (nzr.hasMoreTokens()) {
            v.add(nzr.nextToken());
        }

        return v;
    }

    private String _rfc2184decode(String input) throws Exception {
        StringTokenizer nzr = new StringTokenizer(input, _SQ);

        if (nzr.countTokens() != 3) {
            // log
            throw new XWSSecurityException("Malformed RFC2184 encoded parameter");
        }

        String charset  = nzr.nextToken();
        String language = nzr.nextToken();
        //String encoded  = nzr.nextToken();

        for (int i=0; i