org.bunkr.core.descriptor.DescriptorBuilder.java Source code

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Here is the source code for org.bunkr.core.descriptor.DescriptorBuilder.java

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/**
 * Copyright (c) 2016 Bunkr
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package org.bunkr.core.descriptor;

import org.bunkr.core.Version;
import org.bunkr.core.utils.IO;
import org.json.simple.JSONObject;
import org.json.simple.JSONValue;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

/**
 * Created At: 2015-12-20
 */
public class DescriptorBuilder {
    public static final String KEY_NAME = "security";
    public static final String KEY_PARAMS = "params";

    public static IDescriptor fromJSON(String s) {
        JSONObject jo = (JSONObject) JSONValue.parse(s);
        if (!jo.containsKey(KEY_NAME))
            throw new IllegalArgumentException("Missing required key: " + KEY_NAME);
        if (!jo.containsKey(KEY_PARAMS))
            throw new IllegalArgumentException("Missing required key: " + KEY_NAME);
        String name = (String) jo.get(KEY_NAME);
        JSONObject params = (JSONObject) jo.get(KEY_PARAMS);

        // put security descriptors here
        if (name.equals(PlaintextDescriptor.IDENTIFIER))
            return new PlaintextDescriptor();
        if (name.equals(PBKDF2Descriptor.IDENTIFIER))
            return new PBKDF2Descriptor(params);
        if (name.equals(ScryptDescriptor.IDENTIFIER))
            return new ScryptDescriptor(params);

        throw new IllegalArgumentException("Could not identify SecurityDescriptor type " + name);
    }

    @SuppressWarnings("unchecked")
    public static String toJSON(IDescriptor source) {
        JSONObject jo = new JSONObject();
        jo.put(KEY_NAME, source.getIdentifier());
        jo.put(KEY_PARAMS, source.getParams());
        return jo.toJSONString();
    }

    public static IDescriptor fromFile(File path) throws IOException {
        try (FileInputStream fis = new FileInputStream(path)) {
            try (DataInputStream dis = new DataInputStream(fis)) {
                String fivebytes = IO.readNByteString(dis, 5);
                if (!fivebytes.equals("BUNKR"))
                    throw new IOException("File format header does not match 'BUNKR'");
                Version.assertCompatible(dis.readByte(), dis.readByte(), dis.readByte(), false);
                dis.readInt();
                IO.reliableSkip(dis, dis.readLong());
                return DescriptorBuilder.fromJSON(IO.readString(dis));
            }
        }
    }
}