| /* |
| * Copyright (C) 2017 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.android.printservice.recommendation.plugin.google; |
| |
| import static com.android.printservice.recommendation.util.MDNSUtils.ATTRIBUTE_TY; |
| |
| import android.content.Context; |
| import android.util.ArrayMap; |
| import android.util.Log; |
| |
| import androidx.annotation.NonNull; |
| import androidx.annotation.StringRes; |
| |
| import com.android.printservice.recommendation.PrintServicePlugin; |
| import com.android.printservice.recommendation.R; |
| import com.android.printservice.recommendation.util.MDNSFilteredDiscovery; |
| |
| import java.net.Inet4Address; |
| import java.net.InetAddress; |
| import java.nio.charset.StandardCharsets; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * Plugin detecting <a href="https://developers.google.com/cloud-print/docs/privet">Google Cloud |
| * Print</a> printers. |
| */ |
| public class CloudPrintPlugin implements PrintServicePlugin { |
| private static final String LOG_TAG = CloudPrintPlugin.class.getSimpleName(); |
| private static final boolean DEBUG = false; |
| |
| private static final String ATTRIBUTE_TXTVERS = "txtvers"; |
| private static final String ATTRIBUTE_URL = "url"; |
| private static final String ATTRIBUTE_TYPE = "type"; |
| private static final String ATTRIBUTE_ID = "id"; |
| private static final String ATTRIBUTE_CS = "cs"; |
| |
| private static final String TYPE = "printer"; |
| |
| private static final String PRIVET_SERVICE = "_privet._tcp"; |
| |
| /** The required mDNS service types */ |
| private static final Set<String> PRINTER_SERVICE_TYPE = new HashSet<String>() {{ |
| // Not checking _printer_._sub |
| add(PRIVET_SERVICE); |
| }}; |
| |
| /** All possible connection states */ |
| private static final Set<String> POSSIBLE_CONNECTION_STATES = new HashSet<String>() {{ |
| add("online"); |
| add("offline"); |
| add("connecting"); |
| add("not-configured"); |
| }}; |
| |
| private static final byte SUPPORTED_TXTVERS = '1'; |
| |
| /** The mDNS filtered discovery */ |
| private final MDNSFilteredDiscovery mMDNSFilteredDiscovery; |
| |
| /** |
| * Create a plugin detecting Google Cloud Print printers. |
| * |
| * @param context The context the plugin runs in |
| */ |
| public CloudPrintPlugin(@NonNull Context context) { |
| mMDNSFilteredDiscovery = new MDNSFilteredDiscovery(context, PRINTER_SERVICE_TYPE, |
| nsdServiceInfo -> { |
| // The attributes are case insensitive. For faster searching create a clone of |
| // the map with the attribute-keys all in lower case. |
| ArrayMap<String, byte[]> caseInsensitiveAttributes = |
| new ArrayMap<>(nsdServiceInfo.getAttributes().size()); |
| for (Map.Entry<String, byte[]> entry : nsdServiceInfo.getAttributes() |
| .entrySet()) { |
| caseInsensitiveAttributes.put(entry.getKey().toLowerCase(), |
| entry.getValue()); |
| } |
| |
| if (DEBUG) { |
| Log.i(LOG_TAG, nsdServiceInfo.getServiceName() + ":"); |
| Log.i(LOG_TAG, "type: " + nsdServiceInfo.getServiceType()); |
| Log.i(LOG_TAG, "host: " + nsdServiceInfo.getHost()); |
| for (Map.Entry<String, byte[]> entry : caseInsensitiveAttributes.entrySet()) { |
| if (entry.getValue() == null) { |
| Log.i(LOG_TAG, entry.getKey() + "= null"); |
| } else { |
| Log.i(LOG_TAG, entry.getKey() + "=" + new String(entry.getValue(), |
| StandardCharsets.UTF_8)); |
| } |
| } |
| } |
| |
| byte[] txtvers = caseInsensitiveAttributes.get(ATTRIBUTE_TXTVERS); |
| if (txtvers == null || txtvers.length != 1 || txtvers[0] != SUPPORTED_TXTVERS) { |
| // The spec requires this to be the first attribute, but at this time we |
| // lost the order of the attributes |
| return false; |
| } |
| |
| if (caseInsensitiveAttributes.get(ATTRIBUTE_TY) == null) { |
| return false; |
| } |
| |
| byte[] url = caseInsensitiveAttributes.get(ATTRIBUTE_URL); |
| if (url == null || url.length == 0) { |
| return false; |
| } |
| |
| byte[] type = caseInsensitiveAttributes.get(ATTRIBUTE_TYPE); |
| if (type == null || !TYPE.equals( |
| new String(type, StandardCharsets.UTF_8).toLowerCase())) { |
| return false; |
| } |
| |
| if (caseInsensitiveAttributes.get(ATTRIBUTE_ID) == null) { |
| return false; |
| } |
| |
| byte[] cs = caseInsensitiveAttributes.get(ATTRIBUTE_CS); |
| if (cs == null || !POSSIBLE_CONNECTION_STATES.contains( |
| new String(cs, StandardCharsets.UTF_8).toLowerCase())) { |
| return false; |
| } |
| |
| InetAddress address = nsdServiceInfo.getHost(); |
| if (!(address instanceof Inet4Address)) { |
| // Not checking for link local address |
| return false; |
| } |
| |
| return true; |
| }); |
| } |
| |
| @Override |
| @NonNull public CharSequence getPackageName() { |
| return "com.google.android.apps.cloudprint"; |
| } |
| |
| @Override |
| public void start(@NonNull PrinterDiscoveryCallback callback) throws Exception { |
| mMDNSFilteredDiscovery.start(callback); |
| } |
| |
| @Override |
| @StringRes public int getName() { |
| return R.string.plugin_vendor_google_cloud_print; |
| } |
| |
| @Override |
| public void stop() throws Exception { |
| mMDNSFilteredDiscovery.stop(); |
| } |
| } |