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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2009-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
// Portions Copyright [2019-2021] Payara Foundation and/or affiliates

package org.glassfish.admin.rest.readers;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.net.URLDecoder;
import java.nio.charset.StandardCharsets;
import java.util.StringTokenizer;
import jakarta.ws.rs.Consumes;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.MultivaluedMap;
import jakarta.ws.rs.ext.MessageBodyReader;
import jakarta.ws.rs.ext.Provider;
import org.glassfish.api.admin.ParameterMap;

/**
 *
 * @author mh124079
 * @author Ludovic Champenois [email protected]
 */
@Consumes({MediaType.APPLICATION_FORM_URLENCODED, MediaType.APPLICATION_OCTET_STREAM})
@Provider
public class ParameterMapFormReader implements MessageBodyReader {
    
    private static final String DEFAULT_CHARSET = StandardCharsets.UTF_8.toString();

    @Override
    public boolean isReadable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return type.equals(ParameterMap.class);
    }

    @Override
    public ParameterMap readFrom(Class type, Type genericType,
            Annotation[] annotations, MediaType mediaType, MultivaluedMap headers, 
            InputStream in) throws IOException {
        String formData = readAsString(in);

        ParameterMap map = new ParameterMap();
        StringTokenizer tokenizer = new StringTokenizer(formData, "&");
        String token;
        while (tokenizer.hasMoreTokens()) {
            token = tokenizer.nextToken();
            int idx = token.indexOf('=');
            if (idx < 0) {
                map.add(URLDecoder.decode(token, DEFAULT_CHARSET), null);
            } else if (idx > 0) {
                map.add(URLDecoder.decode(token.substring(0, idx), DEFAULT_CHARSET), URLDecoder.decode(token.substring(idx+1), DEFAULT_CHARSET));
            }
        }
        return map;
    }
    
    public final String readAsString(InputStream in) throws IOException {
        Reader reader = new InputStreamReader(in);
        StringBuilder sb = new StringBuilder();
        char[] c = new char[1024];
        int l;
        while ((l = reader.read(c)) != -1) {
            sb.append(c, 0, l);
        } 
        return sb.toString();
    }
}