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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project 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.jboss.netty.handler.ssl;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.handler.codec.base64.Base64;
import org.jboss.netty.logging.InternalLogger;
import org.jboss.netty.logging.InternalLoggerFactory;
import org.jboss.netty.util.CharsetUtil;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.KeyException;
import java.security.KeyStore;
import java.security.cert.CertificateException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Reads a PEM file and converts it into a list of DERs so that they are imported into a {@link KeyStore} easily.
 */
final class PemReader {

    private static final InternalLogger logger = InternalLoggerFactory.getInstance(PemReader.class);

    private static final Pattern CERT_PATTERN = Pattern.compile(
            "-+BEGIN\\s+.*CERTIFICATE[^-]*-+(?:\\s|\\r|\\n)+" + // Header
                    "([a-z0-9+/=\\r\\n]+)" +                    // Base64 text
                    "-+END\\s+.*CERTIFICATE[^-]*-+",            // Footer
            Pattern.CASE_INSENSITIVE);
    private static final Pattern KEY_PATTERN = Pattern.compile(
            "-+BEGIN\\s+.*PRIVATE\\s+KEY[^-]*-+(?:\\s|\\r|\\n)+" + // Header
                    "([a-z0-9+/=\\r\\n]+)" +                       // Base64 text
                    "-+END\\s+.*PRIVATE\\s+KEY[^-]*-+",            // Footer
            Pattern.CASE_INSENSITIVE);

    static ChannelBuffer[] readCertificates(File file) throws CertificateException {
        String content;
        try {
            content = readContent(file);
        } catch (IOException e) {
            throw new CertificateException("failed to read a file: " + file, e);
        }

        List certs = new ArrayList();
        Matcher m = CERT_PATTERN.matcher(content);
        int start = 0;
        for (;;) {
            if (!m.find(start)) {
                break;
            }

            certs.add(Base64.decode(ChannelBuffers.copiedBuffer(m.group(1), CharsetUtil.US_ASCII)));
            start = m.end();
        }

        if (certs.isEmpty()) {
            throw new CertificateException("found no certificates: " + file);
        }

        return certs.toArray(new ChannelBuffer[certs.size()]);
    }

    static ChannelBuffer readPrivateKey(File file) throws KeyException {
        String content;
        try {
            content = readContent(file);
        } catch (IOException e) {
            throw new KeyException("failed to read a file: " + file, e);
        }

        Matcher m = KEY_PATTERN.matcher(content);
        if (!m.find()) {
            throw new KeyException("found no private key: " + file);
        }

        return Base64.decode(ChannelBuffers.copiedBuffer(m.group(1), CharsetUtil.US_ASCII));
    }

    private static String readContent(File file) throws IOException {
        InputStream in = new FileInputStream(file);
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        try {
            byte[] buf = new byte[8192];
            for (;;) {
                int ret = in.read(buf);
                if (ret < 0) {
                    break;
                }
                out.write(buf, 0, ret);
            }
            return out.toString(CharsetUtil.US_ASCII.name());
        } finally {
            safeClose(in);
            safeClose(out);
        }
    }

    private static void safeClose(InputStream in) {
        try {
            in.close();
        } catch (IOException e) {
            logger.warn("Failed to close a stream.", e);
        }
    }

    private static void safeClose(OutputStream out) {
        try {
            out.close();
        } catch (IOException e) {
            logger.warn("Failed to close a stream.", e);
        }
    }

    private PemReader() { }
}