/**
* Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
*
* You are hereby granted a non-exclusive, worldwide, royalty-free license to use,
* copy, modify, and distribute this software in source code or binary form for use
* in connection with the web services and APIs provided by Facebook.
*
* As with any software that integrates with the Facebook platform, your use of
* this software is subject to the Facebook Developer Principles and Policies
* [http://developers.facebook.com/policy/]. This copyright 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 com.example.switchuser;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Parcel;
import android.util.Base64;
import com.facebook.FacebookSdk;
class UserInfoCache {
private static final String USER_INFO_CACHE_FORMAT = "userInfo%d";
private final String userInfoCacheKey;
private final int slot;
public UserInfoCache(int slotNumber) {
userInfoCacheKey = String.format(USER_INFO_CACHE_FORMAT, slotNumber);
slot = slotNumber;
}
public UserInfo get() {
SharedPreferences prefs = getSharedPrefs();
String encodedToken = prefs.getString(userInfoCacheKey, null);
if(encodedToken == null) {
return null;
}
UserInfo info = decodeUserInfo(encodedToken);
if (info.getAccessToken().isExpired()) {
clear();
return null;
}
return info;
}
public void put(UserInfo userInfo) {
SharedPreferences.Editor editor = getSharedPrefs().edit();
String encodedToken = encodeUserInfo(userInfo);
editor.putString(userInfoCacheKey, encodedToken);
editor.apply();
}
public void clear() {
SharedPreferences.Editor editor = getSharedPrefs().edit();
editor.remove(userInfoCacheKey);
editor.apply();
}
private static SharedPreferences getSharedPrefs() {
return FacebookSdk.getApplicationContext().getSharedPreferences(
"accessTokens",
Context.MODE_PRIVATE);
}
private static UserInfo decodeUserInfo(String base64EncodedToken) {
byte[] data = Base64.decode(base64EncodedToken, Base64.DEFAULT);
Parcel parcel = Parcel.obtain();
parcel.unmarshall(data, 0, data.length);
parcel.setDataPosition(0);
UserInfo userInfo = (UserInfo) parcel.readValue(UserInfo.class.getClassLoader());
parcel.recycle();
return userInfo;
}
private static String encodeUserInfo(UserInfo userInfo) {
Parcel parcel = Parcel.obtain();
parcel.writeValue(userInfo);
byte[] data = parcel.marshall();
parcel.recycle();
return Base64.encodeToString(data, Base64.DEFAULT);
}
}