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| package com.opensymphony.oscache.plugins.diskpersistence; |
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| import com.opensymphony.oscache.base.Config; |
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| import com.opensymphony.oscache.base.persistence.PersistenceListener; |
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| import java.security.MessageDigest; |
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| import java.security.NoSuchAlgorithmException; |
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| public class HashDiskPersistenceListener extends AbstractDiskPersistenceListener { |
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| public final static String HASH_ALGORITHM_KEY = "cache.persistence.disk.hash.algorithm"; |
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| public final static String DEFAULT_HASH_ALGORITHM = "MD5"; |
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| protected MessageDigest md = null; |
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| public PersistenceListener configure(Config config) {
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| try {
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| if (config.getProperty(HashDiskPersistenceListener.HASH_ALGORITHM_KEY) != null) {
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| try {
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| md = MessageDigest.getInstance(config.getProperty(HashDiskPersistenceListener.HASH_ALGORITHM_KEY));
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| } catch (NoSuchAlgorithmException e) { |
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| md = MessageDigest.getInstance(HashDiskPersistenceListener.DEFAULT_HASH_ALGORITHM);
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| } |
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| } else { |
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| md = MessageDigest.getInstance(HashDiskPersistenceListener.DEFAULT_HASH_ALGORITHM);
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| } |
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| } catch (NoSuchAlgorithmException e) { |
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| e.printStackTrace();
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| throw new RuntimeException("No hash algorithm available for disk persistence", e);
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| } |
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| return super.configure(config);
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| } |
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| protected char[] getCacheFileName(String key) {
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| byte[] digest;
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| if ((key == null) || (key.length() == 0)) {
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| throw new IllegalArgumentException("Invalid key '" + key + "' specified to getCacheFile.");
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| } |
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| digest = md.digest(key.getBytes());
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| String hexString = byteArrayToHexString(digest);
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| return hexString.toCharArray();
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| } |
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| static String byteArrayToHexString(byte[] in) {
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| byte ch = 0x00;
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| int i = 0;
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| if ((in == null) || (in.length <= 0)) {
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| return null;
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| } |
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| String[] pseudo = {
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| "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", |
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| "E", "F" |
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| }; |
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| StringBuffer out = new StringBuffer(in.length * 2);
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| while (i < in.length) {
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| ch = (byte) (in[i] & 0xF0);
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| ch = (byte) (ch >>> 4);
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| ch = (byte) (ch & 0x0F);
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| out.append(pseudo[(int) ch]);
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| ch = (byte) (in[i] & 0x0F);
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| out.append(pseudo[(int) ch]);
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| i++;
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| } |
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| String rslt = new String(out);
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| return rslt;
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| } |
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| } |