48 lines
2 KiB
Java
48 lines
2 KiB
Java
/*
|
|
* Copyright (C) 2010 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package com.google.android.vending.licensing;
|
|
|
|
/**
|
|
* Allows the developer to limit the number of devices using a single license.
|
|
* <p>
|
|
* The LICENSED response from the server contains a user identifier unique to
|
|
* the <application, user> pair. The developer can send this identifier
|
|
* to their own server along with some device identifier (a random number
|
|
* generated and stored once per application installation,
|
|
* {@link android.telephony.TelephonyManager#getDeviceId getDeviceId},
|
|
* {@link android.provider.Settings.Secure#ANDROID_ID ANDROID_ID}, etc).
|
|
* The more sources used to identify the device, the harder it will be for an
|
|
* attacker to spoof.
|
|
* <p>
|
|
* The server can look at the <application, user, device id> tuple and
|
|
* restrict a user's application license to run on at most 10 different devices
|
|
* in a week (for example). We recommend not being too restrictive because a
|
|
* user might legitimately have multiple devices or be in the process of
|
|
* changing phones. This will catch egregious violations of multiple people
|
|
* sharing one license.
|
|
*/
|
|
public interface DeviceLimiter {
|
|
|
|
/**
|
|
* Checks if this device is allowed to use the given user's license.
|
|
*
|
|
* @param userId the user whose license the server responded with
|
|
* @return LICENSED if the device is allowed, NOT_LICENSED if not, RETRY if an error occurs
|
|
*/
|
|
int isDeviceAllowed(String userId);
|
|
}
|