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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.gcm;
import android.content.Context;
import android.content.SharedPreferences;
import android.support.annotation.NonNull;
import android.util.Log;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
import com.google.android.gms.gcm.GoogleCloudMessaging;
import com.google.android.gms.iid.InstanceID;
import org.mozilla.gecko.GeckoSharedPrefs;
import org.mozilla.gecko.push.Fetched;
import java.io.IOException;
/**
* Fetch and cache GCM tokens.
* <p/>
* GCM tokens are stable and long lived. Google Play Services will periodically request that
* they are rotated, however: see
* <a href="https://developers.google.com/instance-id/guides/android-implementation">https://developers.google.com/instance-id/guides/android-implementation</a>.
* <p/>
* The GCM token is cached in the App-wide shared preferences. There's no particular harm in
* requesting new tokens, so if the user clears the App data, that's fine -- we'll get a fresh
* token and Push will react accordingly.
*/
public class GcmTokenClient {
private static final String LOG_TAG = "GeckoPushGCM";
private static final String KEY_GCM_TOKEN = "gcm_token";
private static final String KEY_GCM_TOKEN_TIMESTAMP = "gcm_token_timestamp";
private final Context context;
public GcmTokenClient(Context context) {
this.context = context;
}
/**
* Check the device to make sure it has the Google Play Services APK.
* @param context Android context.
*/
protected void ensurePlayServices(Context context) throws NeedsGooglePlayServicesException {
final GoogleApiAvailability apiAvailability = GoogleApiAvailability.getInstance();
int resultCode = apiAvailability.isGooglePlayServicesAvailable(context);
if (resultCode != ConnectionResult.SUCCESS) {
Log.w(LOG_TAG, "This device does not support GCM! isGooglePlayServicesAvailable returned: " + resultCode);
Log.w(LOG_TAG, "isGooglePlayServicesAvailable message: " + apiAvailability.getErrorString(resultCode));
throw new NeedsGooglePlayServicesException(resultCode);
}
}
/**
* Get a GCM token (possibly cached).
*
* @param senderID to request token for.
* @param debug whether to log debug details.
* @return token and timestamp.
* @throws NeedsGooglePlayServicesException if user action is needed to use Google Play Services.
* @throws IOException if the token fetch failed.
*/
public @NonNull Fetched getToken(@NonNull String senderID, boolean debug) throws NeedsGooglePlayServicesException, IOException {
ensurePlayServices(this.context);
final SharedPreferences sharedPrefs = GeckoSharedPrefs.forApp(context);
String token = sharedPrefs.getString(KEY_GCM_TOKEN, null);
long timestamp = sharedPrefs.getLong(KEY_GCM_TOKEN_TIMESTAMP, 0L);
if (token != null && timestamp > 0L) {
if (debug) {
Log.i(LOG_TAG, "Cached GCM token exists: " + token);
} else {
Log.i(LOG_TAG, "Cached GCM token exists.");
}
return new Fetched(token, timestamp);
}
Log.i(LOG_TAG, "Cached GCM token does not exist; requesting new token with sender ID: " + senderID);
final InstanceID instanceID = InstanceID.getInstance(context);
token = instanceID.getToken(senderID, GoogleCloudMessaging.INSTANCE_ID_SCOPE, null);
timestamp = System.currentTimeMillis();
if (debug) {
Log.i(LOG_TAG, "Got fresh GCM token; caching: " + token);
} else {
Log.i(LOG_TAG, "Got fresh GCM token; caching.");
}
sharedPrefs
.edit()
.putString(KEY_GCM_TOKEN, token)
.putLong(KEY_GCM_TOKEN_TIMESTAMP, timestamp)
.apply();
return new Fetched(token, timestamp);
}
/**
* Remove any cached GCM token.
*/
public void invalidateToken() {
final SharedPreferences sharedPrefs = GeckoSharedPrefs.forApp(context);
sharedPrefs
.edit()
.remove(KEY_GCM_TOKEN)
.remove(KEY_GCM_TOKEN_TIMESTAMP)
.apply();
}
public class NeedsGooglePlayServicesException extends Exception {
private static final long serialVersionUID = 4132853166L;
private final int resultCode;
NeedsGooglePlayServicesException(int resultCode) {
super();
this.resultCode = resultCode;
}
public void showErrorNotification() {
final GoogleApiAvailability apiAvailability = GoogleApiAvailability.getInstance();
apiAvailability.showErrorNotification(context, resultCode);
}
}
}
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