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/*
 * Copyright (c) 2011, 2022, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.webkit.network.data;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.Charset;
import java.util.Base64;
import java.util.LinkedList;

/**
 * Implementation of the data: protocol handler as specified by RFC 2397.
 * Examples:
 * data:image/gif;base64,R0lGODdhM....
 * data:text/plain;charset=iso-8859-7,%be%f9%be
 * data:text/css,.picture%20%7B%20background%3A%20none%3B%20%7D
 * data:application/x-unknown,ERROR
 *
 * @author jccollet
 */
final class DataURLConnection extends URLConnection {

    private static final Charset US_ASCII = Charset.forName("US-ASCII");


    private final String mediaType;
    private final byte[] data;
    private final InputStream inputStream;


    DataURLConnection(URL url) throws IOException {
        super(url);

        String content = url.toString();
        content = content.substring(content.indexOf(':') + 1);

        int commaPosition = content.indexOf(',');
        if (commaPosition < 0) {
            throw new ProtocolException(
                    "Invalid URL, ',' not found in: " + getURL());
        }

        String metadata = content.substring(0, commaPosition);
        String dataString = content.substring(commaPosition + 1);

        String mimeType = null;
        LinkedList parameters = new LinkedList<>();
        Charset charset = null;
        boolean base64 = false;

        String[] components = metadata.split(";", -1);
        for (int i = 0; i < components.length; i++) {
            String component = components[i];
            if (component.equalsIgnoreCase("base64")) {
                base64 = true;
            } else {
                if (i == 0 && !component.contains("=")) {
                    mimeType = component;
                } else {
                    parameters.add(component);
                    if (component.toLowerCase().startsWith("charset=")) {
                        try {
                            charset = Charset.forName(component.substring(8));
                        } catch (IllegalArgumentException ex) {
                            UnsupportedEncodingException ex2 =
                                    new UnsupportedEncodingException();
                            ex2.initCause(ex);
                            throw ex2;
                        }
                    }
                }
            }
        }

        if (mimeType == null || mimeType.isEmpty()) {
            mimeType = "text/plain";
        }

        if (charset == null) {
            charset = US_ASCII;
            if (mimeType.toLowerCase().startsWith("text/")) {
                parameters.addFirst("charset=" + charset.name());
            }
        }

        StringBuilder mediaTypeBuilder = new StringBuilder();
        mediaTypeBuilder.append(mimeType);
        for (String parameter : parameters) {
            mediaTypeBuilder.append(';').append(parameter);
        }
        mediaType = mediaTypeBuilder.toString();

        if (base64) {
            String s = urlDecode(dataString, US_ASCII);
            s = s.replaceAll("\\s+", "");
            data = Base64.getMimeDecoder().decode(s);
        } else {
            String s = urlDecode(dataString, charset);
            data = s.getBytes(charset);
        }

        inputStream = new ByteArrayInputStream(data);
    }


    @Override
    public void connect() {
        connected = true;
    }

    @Override
    public InputStream getInputStream() {
        return inputStream;
    }

    @Override
    public String getContentType() {
        return mediaType;
    }

    @Override
    public String getContentEncoding() {
        return null;
    }

    @Override
    public int getContentLength() {
        // -1 means 'unknown length'
        return data != null ? data.length : -1;
    }

    private static String urlDecode(String str, Charset charset) {
        int length = str.length();
        StringBuilder sb = new StringBuilder(length);
        byte[] bytes = null;

        int i = 0;
        while (i < length) {
            char c = str.charAt(i);
            if (c == '%') {
                // parse the series of contiguous %xy sequences
                if (bytes == null) {
                    bytes = new byte[(length - i) / 3];
                }
                int count = 0;
                int proceedTo = i;
                for ( ; i < length; i += 3) {
                    c = str.charAt(i);
                    if (c != '%') {
                        // end of the series
                        break;
                    }
                    if (i + 2 >= length) {
                        // not enough characters to complete the current
                        // %xy sequence: terminate the series and append
                        // the remaining characters without decoding
                        proceedTo = length;
                        break;
                    }
                    byte b;
                    try {
                        b = (byte) Integer.parseInt(
                                str.substring(i + 1, i + 3), 16);
                    } catch(NumberFormatException ex) {
                        // illegal %xy sequence: terminate the series
                        // and append the %xy sequence without decoding
                        proceedTo = i + 3;
                        break;
                    }
                    bytes[count++] = b;
                }
                if (count > 0) {
                    sb.append(new String(bytes, 0, count, charset));
                }
                while (i < proceedTo) {
                    sb.append(str.charAt(i++));
                }
            } else {
                sb.append(c);
                i++;
            }
        }

        return sb.toString();
    }
}