michael@0: /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: package org.mozilla.gecko.home;
michael@0: 
michael@0: import android.content.Context;
michael@0: import android.content.SharedPreferences;
michael@0: import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
michael@0: import android.util.Log;
michael@0: 
michael@0: import org.mozilla.gecko.GeckoSharedPrefs;
michael@0: 
michael@0: /**
michael@0:  * Cache used to store authentication state of dynamic panels. The values
michael@0:  * in this cache are set in JS through the Home.panels API.
michael@0:  *
michael@0:  * {@code DynamicPanel} uses this cache to determine whether or not to
michael@0:  * show authentication UI for dynamic panels, including listening for
michael@0:  * changes in authentication state.
michael@0:  */
michael@0: class PanelAuthCache {
michael@0:     private static final String LOGTAG = "GeckoPanelAuthCache";
michael@0: 
michael@0:     // Keep this in sync with the constant defined in Home.jsm
michael@0:     private static final String PREFS_PANEL_AUTH_PREFIX = "home_panels_auth_";
michael@0: 
michael@0:     private final Context mContext;
michael@0:     private SharedPrefsListener mSharedPrefsListener;
michael@0:     private OnChangeListener mChangeListener;
michael@0: 
michael@0:     public interface OnChangeListener {
michael@0:         public void onChange(String panelId, boolean isAuthenticated);
michael@0:     }
michael@0: 
michael@0:     public PanelAuthCache(Context context) {
michael@0:         mContext = context;
michael@0:     }
michael@0: 
michael@0:     private SharedPreferences getSharedPreferences() {
michael@0:         return GeckoSharedPrefs.forProfile(mContext);
michael@0:     }
michael@0: 
michael@0:     private String getPanelAuthKey(String panelId) {
michael@0:         return PREFS_PANEL_AUTH_PREFIX + panelId;
michael@0:     }
michael@0: 
michael@0:     public boolean isAuthenticated(String panelId) {
michael@0:         final SharedPreferences prefs = getSharedPreferences();
michael@0:         return prefs.getBoolean(getPanelAuthKey(panelId), false);
michael@0:     }
michael@0: 
michael@0:     public void setOnChangeListener(OnChangeListener listener) {
michael@0:         final SharedPreferences prefs = getSharedPreferences();
michael@0: 
michael@0:         if (mChangeListener != null) {
michael@0:             prefs.unregisterOnSharedPreferenceChangeListener(mSharedPrefsListener);
michael@0:             mSharedPrefsListener = null;
michael@0:         }
michael@0: 
michael@0:         mChangeListener = listener;
michael@0: 
michael@0:         if (mChangeListener != null) {
michael@0:             mSharedPrefsListener = new SharedPrefsListener();
michael@0:             prefs.registerOnSharedPreferenceChangeListener(mSharedPrefsListener);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     private class SharedPrefsListener implements OnSharedPreferenceChangeListener {
michael@0:         @Override
michael@0:         public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
michael@0:             if (key.startsWith(PREFS_PANEL_AUTH_PREFIX)) {
michael@0:                 final String panelId = key.substring(PREFS_PANEL_AUTH_PREFIX.length());
michael@0:                 final boolean isAuthenticated = prefs.getBoolean(key, false);
michael@0: 
michael@0:                 Log.d(LOGTAG, "Auth state changed: panelId=" + panelId + ", isAuthenticated=" + isAuthenticated);
michael@0:                 mChangeListener.onChange(panelId, isAuthenticated);
michael@0:             }
michael@0:         }
michael@0:     }
michael@0: }