/*
* 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;
import android.util.Log;
import com.google.android.vending.licensing.util.URIQueryDecoder;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.HashMap;
import java.util.Map;
/**
* Non-caching policy. All requests will be sent to the licensing service,
* and no local caching is performed.
* <p>
* Using a non-caching policy ensures that there is no local preference data
* for malicious users to tamper with. As a side effect, applications
* will not be permitted to run while offline. Developers should carefully
* weigh the risks of using this Policy over one which implements caching,
* such as ServerManagedPolicy.
* <p>
* Access to the application is only allowed if a LICENSED response is.
* received. All other responses (including RETRY) will deny access.
*/
public class StrictPolicy implements Policy {
private static final String TAG = "StrictPolicy";
private int mLastResponse;
private String mLicensingUrl;
public StrictPolicy() {
// Set default policy. This will force the application to check the policy on launch.
mLastResponse = Policy.RETRY;
mLicensingUrl = null;
}
/**
* Process a new response from the license server. Since we aren't
* performing any caching, this equates to reading the LicenseResponse.
* Any cache-related ResponseData is ignored, but the licensing URL
* extra is still extracted in cases where the app is unlicensed.
*
* @param response the result from validating the server response
* @param rawData the raw server response data
*/
public void processServerResponse(int response, ResponseData rawData) {
mLastResponse = response;
if (response == Policy.NOT_LICENSED) {
Map<String, String> extras = decodeExtras(rawData);
mLicensingUrl = extras.get("LU");
}
}
/**
* {@inheritDoc}
*
* This implementation allows access if and only if a LICENSED response
* was received the last time the server was contacted.
*/
public boolean allowAccess() {
return (mLastResponse == Policy.LICENSED);
}
public String getLicensingUrl() {
return mLicensingUrl;
}
private Map<String, String> decodeExtras(
com.google.android.vending.licensing.ResponseData rawData) {
Map<String, String> results = new HashMap<String, String>();
if (rawData == null) {
return results;
}
try {
URI rawExtras = new URI("?" + rawData.extra);
URIQueryDecoder.DecodeQuery(rawExtras, results);
} catch (URISyntaxException e) {
Log.w(TAG, "Invalid syntax error while decoding extras data from server.");
}
return results;
}
}