/**
  * Created by tamic on 2016-06-09.
  */
public class PersistentCookieStore {
private static final String LOG_TAG = "PersistentCookieStore";
private static final String COOKIE_PREFS = "Cookies_Prefs";
private final Map<String, ConcurrentHashMap<String, Cookie>> cookies;
private final SharedPreferences cookiePrefs;
public PersistentCookieStore(Context context) {
    cookiePrefs = context.getSharedPreferences(COOKIE_PREFS, 0);
    cookies = new HashMap<>();
    //将持久化的cookies缓存到内存中 即map cookies
    Map<String, ?> prefsMap = cookiePrefs.getAll();
    for (Map.Entry<String, ?> entry : prefsMap.entrySet()) {
        String[] cookieNames = TextUtils.split((String) entry.getValue(), ",");
        for (String name : cookieNames) {
            String encodedCookie = cookiePrefs.getString(name, null);
            if (encodedCookie != null) {
                Cookie decodedCookie = decodeCookie(encodedCookie);
                if (decodedCookie != null) {
                    if (!cookies.containsKey(entry.getKey())) {
                        cookies.put(entry.getKey(), new ConcurrentHashMap<String, Cookie>());
                    }
                    cookies.get(entry.getKey()).put(name, decodedCookie);
                }
            }
        }
    }
}
protected String getCookieToken(Cookie cookie) {
    return cookie.name() + "@" + cookie.domain();
}
public void add(HttpUrl url, Cookie cookie) {
    String name = getCookieToken(cookie);
    //将cookies缓存到内存中 如果缓存过期 就重置此cookie
    if (!cookie.persistent()) {
        if (!cookies.containsKey(url.host())) {
            cookies.put(url.host(), new ConcurrentHashMap<String, Cookie>());
        }
        cookies.get(url.host()).put(name, cookie);
    } else {
        if (cookies.containsKey(url.host())) {
            cookies.get(url.host()).remove(name);
        }
    }
    //讲cookies持久化到本地
    SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
    prefsWriter.putString(url.host(), TextUtils.join(",", cookies.get(url.host()).keySet()));
    prefsWriter.putString(name, encodeCookie(new OkHttpCookies(cookie)));
    prefsWriter.apply();
}
public List<Cookie> get(HttpUrl url) {
    ArrayList<Cookie> ret = new ArrayList<>();
    if (cookies.containsKey(url.host()))
        ret.addAll(cookies.get(url.host()).values());
    return ret;
}
public boolean removeAll() {
    SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
    prefsWriter.clear();
    prefsWriter.apply();
    cookies.clear();
    return true;
}
public boolean remove(HttpUrl url, Cookie cookie) {
    String name = getCookieToken(cookie);
    if (cookies.containsKey(url.host()) && cookies.get(url.host()).containsKey(name)) {
        cookies.get(url.host()).remove(name);
        SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
        if (cookiePrefs.contains(name)) {
            prefsWriter.remove(name);
        }
        prefsWriter.putString(url.host(), TextUtils.join(",", cookies.get(url.host()).keySet()));
        prefsWriter.apply();
        return true;
    } else {
        return false;
    }
}
public List<Cookie> getCookies() {
    ArrayList<Cookie> ret = new ArrayList<>();
    for (String key : cookies.keySet())
        ret.addAll(cookies.get(key).values());
    return ret;
}
/**
 * cookies 序列化成 string
 *
 * @param cookie 要序列化的cookie
 * @return 序列化之后的string
 */
protected String encodeCookie(OkHttpCookies cookie) {
    if (cookie == null)
        return null;
    ByteArrayOutputStream os = new ByteArrayOutputStream();
    try {
        ObjectOutputStream outputStream = new ObjectOutputStream(os);
        outputStream.writeObject(cookie);
    } catch (IOException e) {
        Log.d(LOG_TAG, "IOException in encodeCookie", e);
        return null;
    }
    return byteArrayToHexString(os.toByteArray());
}
/**
 * 将字符串反序列化成cookies
 *
 * @param cookieString cookies string
 * @return cookie object
 */
protected Cookie decodeCookie(String cookieString) {
    byte[] bytes = hexStringToByteArray(cookieString);
    ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
    Cookie cookie = null;
    try {
        ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);
        cookie = ((OkHttpCookies) objectInputStream.readObject()).getCookies();
    } catch (IOException e) {
        Log.d(LOG_TAG, "IOException in decodeCookie", e);
    } catch (ClassNotFoundException e) {
        Log.d(LOG_TAG, "ClassNotFoundException in decodeCookie", e);
    }
    return cookie;
}
/**
 * 二进制数组转十六进制字符串
 *
 * @param bytes byte array to be converted
 * @return string containing hex values
 */
protected String byteArrayToHexString(byte[] bytes) {
    StringBuilder sb = new StringBuilder(bytes.length * 2);
    for (byte element : bytes) {
        int v = element & 0xff;
        if (v < 16) {
            sb.append('0');
        }
        sb.append(Integer.toHexString(v));
    }
    return sb.toString().toUpperCase(Locale.US);
}
/**
 * 十六进制字符串转二进制数组
 *
 * @param hexString string of hex-encoded values
 * @return decoded byte array
 */
protected byte[] hexStringToByteArray(String hexString) {
    int len = hexString.length();
    byte[] data = new byte[len / 2];
    for (int i = 0; i < len; i += 2) {
        data[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4) + Character.digit(hexString.charAt(i + 1), 16));
    }
    return data;
}