org.sonar.api.config.Encryption.java Source code

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Here is the source code for org.sonar.api.config.Encryption.java

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/*
 * Sonar, open source software quality management tool.
 * Copyright (C) 2008-2012 SonarSource
 * mailto:contact AT sonarsource DOT com
 *
 * Sonar is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * Sonar 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Sonar; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */
package org.sonar.api.config;

import com.google.common.collect.ImmutableMap;

import java.util.Locale;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @since 3.0
 */
public final class Encryption {

    private static final String BASE64_ALGORITHM = "b64";

    private static final String AES_ALGORITHM = "aes";
    private final AesCipher aesCipher;

    private final Map<String, Cipher> ciphers;
    private static final Pattern ENCRYPTED_PATTERN = Pattern.compile("\\{(.*?)\\}(.*)");

    Encryption(Settings settings) {
        aesCipher = new AesCipher(settings);
        ciphers = ImmutableMap.of(BASE64_ALGORITHM, new Base64Cipher(), AES_ALGORITHM, aesCipher);
    }

    /**
     * Checks the availability of the secret key, that is required to encrypt and decrypt.
     */
    public boolean hasSecretKey() {
        return aesCipher.hasSecretKey();
    }

    public boolean isEncrypted(String value) {
        return value.indexOf('{') == 0 && value.indexOf('}') > 1;
    }

    public String encrypt(String clearText) {
        return encrypt(AES_ALGORITHM, clearText);
    }

    public String scramble(String clearText) {
        return encrypt(BASE64_ALGORITHM, clearText);
    }

    public String generateRandomSecretKey() {
        return aesCipher.generateRandomSecretKey();
    }

    public String decrypt(String encryptedText) {
        Matcher matcher = ENCRYPTED_PATTERN.matcher(encryptedText);
        if (matcher.matches()) {
            Cipher cipher = ciphers.get(matcher.group(1).toLowerCase(Locale.ENGLISH));
            if (cipher != null) {
                return cipher.decrypt(matcher.group(2));
            }
        }
        return encryptedText;
    }

    private String encrypt(String algorithm, String clearText) {
        Cipher cipher = ciphers.get(algorithm);
        if (cipher == null) {
            throw new IllegalArgumentException("Unknown cipher algorithm: " + algorithm);
        }
        return String.format("{%s}%s", algorithm, cipher.encrypt(clearText));
    }
}