1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package android.net; 18 19 import android.Manifest; 20 import android.annotation.SdkConstant; 21 import android.annotation.SdkConstant.SdkConstantType; 22 import android.annotation.SystemApi; 23 import android.content.Context; 24 import android.content.Intent; 25 import android.net.NetworkScorerAppManager.NetworkScorerAppData; 26 import android.os.IBinder; 27 import android.os.RemoteException; 28 import android.os.ServiceManager; 29 import android.os.UserHandle; 30 31 /** 32 * Class that manages communication between network subsystems and a network scorer. 33 * 34 * <p>You can get an instance of this class by calling 35 * {@link android.content.Context#getSystemService(String)}: 36 * 37 * <pre>NetworkScoreManager manager = 38 * (NetworkScoreManager) getSystemService(Context.NETWORK_SCORE_SERVICE)</pre> 39 * 40 * <p>A network scorer is any application which: 41 * <ul> 42 * <li>Declares the {@link android.Manifest.permission#SCORE_NETWORKS} permission. 43 * <li>Includes a receiver for {@link #ACTION_SCORE_NETWORKS} guarded by the 44 * {@link android.Manifest.permission#BROADCAST_NETWORK_PRIVILEGED} permission which scores 45 * networks and (eventually) calls {@link #updateScores} with the results. If this receiver 46 * specifies an android:label attribute, this label will be used when referring to the 47 * application throughout system settings; otherwise, the application label will be used. 48 * </ul> 49 * 50 * <p>The system keeps track of an active scorer application; at any time, only this application 51 * will receive {@link #ACTION_SCORE_NETWORKS} broadcasts and will be permitted to call 52 * {@link #updateScores}. Applications may determine the current active scorer with 53 * {@link #getActiveScorerPackage()} and request to change the active scorer by sending an 54 * {@link #ACTION_CHANGE_ACTIVE} broadcast with another scorer. 55 * 56 * @hide 57 */ 58 @SystemApi 59 public class NetworkScoreManager { 60 /** 61 * Activity action: ask the user to change the active network scorer. This will show a dialog 62 * that asks the user whether they want to replace the current active scorer with the one 63 * specified in {@link #EXTRA_PACKAGE_NAME}. The activity will finish with RESULT_OK if the 64 * active scorer was changed or RESULT_CANCELED if it failed for any reason. 65 */ 66 @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION) 67 public static final String ACTION_CHANGE_ACTIVE = "android.net.scoring.CHANGE_ACTIVE"; 68 69 /** 70 * Extra used with {@link #ACTION_CHANGE_ACTIVE} to specify the new scorer package. Set with 71 * {@link android.content.Intent#putExtra(String, String)}. 72 */ 73 public static final String EXTRA_PACKAGE_NAME = "packageName"; 74 75 /** 76 * Broadcast action: new network scores are being requested. This intent will only be delivered 77 * to the current active scorer app. That app is responsible for scoring the networks and 78 * calling {@link #updateScores} when complete. The networks to score are specified in 79 * {@link #EXTRA_NETWORKS_TO_SCORE}, and will generally consist of all networks which have been 80 * configured by the user as well as any open networks. 81 * 82 * <p class="note">This is a protected intent that can only be sent by the system. 83 */ 84 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 85 public static final String ACTION_SCORE_NETWORKS = "android.net.scoring.SCORE_NETWORKS"; 86 87 /** 88 * Extra used with {@link #ACTION_SCORE_NETWORKS} to specify the networks to be scored, as an 89 * array of {@link NetworkKey}s. Can be obtained with 90 * {@link android.content.Intent#getParcelableArrayExtra(String)}}. 91 */ 92 public static final String EXTRA_NETWORKS_TO_SCORE = "networksToScore"; 93 94 /** 95 * Activity action: launch a custom activity for configuring a scorer before enabling it. 96 * Scorer applications may choose to specify an activity for this action, in which case the 97 * framework will launch that activity which should return RESULT_OK if scoring was enabled. 98 * 99 * <p>If no activity is included in a scorer which implements this action, the system dialog for 100 * selecting a scorer will be shown instead. 101 */ 102 @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION) 103 public static final String ACTION_CUSTOM_ENABLE = "android.net.scoring.CUSTOM_ENABLE"; 104 105 /** 106 * Broadcast action: the active scorer has been changed. Scorer apps may listen to this to 107 * perform initialization once selected as the active scorer, or clean up unneeded resources 108 * if another scorer has been selected. This is an explicit broadcast only sent to the 109 * previous scorer and new scorer. Note that it is unnecessary to clear existing scores as 110 * this is handled by the system. 111 * 112 * <p>The new scorer will be specified in {@link #EXTRA_NEW_SCORER}. 113 * 114 * <p class="note">This is a protected intent that can only be sent by the system. 115 */ 116 @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION) 117 public static final String ACTION_SCORER_CHANGED = "android.net.scoring.SCORER_CHANGED"; 118 119 /** 120 * Extra used with {@link #ACTION_SCORER_CHANGED} to specify the newly selected scorer's package 121 * name. Will be null if scoring was disabled. Can be obtained with 122 * {@link android.content.Intent#getStringExtra(String)}. 123 */ 124 public static final String EXTRA_NEW_SCORER = "newScorer"; 125 126 private final Context mContext; 127 private final INetworkScoreService mService; 128 129 /** @hide */ 130 public NetworkScoreManager(Context context) { 131 mContext = context; 132 IBinder iBinder = ServiceManager.getService(Context.NETWORK_SCORE_SERVICE); 133 mService = INetworkScoreService.Stub.asInterface(iBinder); 134 } 135 136 /** 137 * Obtain the package name of the current active network scorer. 138 * 139 * <p>At any time, only one scorer application will receive {@link #ACTION_SCORE_NETWORKS} 140 * broadcasts and be allowed to call {@link #updateScores}. Applications may use this method to 141 * determine the current scorer and offer the user the ability to select a different scorer via 142 * the {@link #ACTION_CHANGE_ACTIVE} intent. 143 * @return the full package name of the current active scorer, or null if there is no active 144 * scorer. 145 */ 146 public String getActiveScorerPackage() { 147 NetworkScorerAppData app = NetworkScorerAppManager.getActiveScorer(mContext); 148 if (app == null) { 149 return null; 150 } 151 return app.mPackageName; 152 } 153 154 /** 155 * Update network scores. 156 * 157 * <p>This may be called at any time to re-score active networks. Scores will generally be 158 * updated quickly, but if this method is called too frequently, the scores may be held and 159 * applied at a later time. 160 * 161 * @param networks the networks which have been scored by the scorer. 162 * @return whether the update was successful. 163 * @throws SecurityException if the caller is not the active scorer. 164 */ 165 public boolean updateScores(ScoredNetwork[] networks) throws SecurityException { 166 try { 167 return mService.updateScores(networks); 168 } catch (RemoteException e) { 169 throw e.rethrowFromSystemServer(); 170 } 171 } 172 173 /** 174 * Clear network scores. 175 * 176 * <p>Should be called when all scores need to be invalidated, i.e. because the scoring 177 * algorithm has changed and old scores can no longer be compared to future scores. 178 * 179 * <p>Note that scores will be cleared automatically when the active scorer changes, as scores 180 * from one scorer cannot be compared to those from another scorer. 181 * 182 * @return whether the clear was successful. 183 * @throws SecurityException if the caller is not the active scorer or privileged. 184 */ 185 public boolean clearScores() throws SecurityException { 186 try { 187 return mService.clearScores(); 188 } catch (RemoteException e) { 189 throw e.rethrowFromSystemServer(); 190 } 191 } 192 193 /** 194 * Set the active scorer to a new package and clear existing scores. 195 * 196 * <p>Should never be called directly without obtaining user consent. This can be done by using 197 * the {@link #ACTION_CHANGE_ACTIVE} broadcast, or using a custom configuration activity. 198 * 199 * @return true if the operation succeeded, or false if the new package is not a valid scorer. 200 * @throws SecurityException if the caller does not hold the 201 * {@link android.Manifest.permission#SCORE_NETWORKS} permission. 202 * @hide 203 */ 204 @SystemApi 205 public boolean setActiveScorer(String packageName) throws SecurityException { 206 try { 207 return mService.setActiveScorer(packageName); 208 } catch (RemoteException e) { 209 throw e.rethrowFromSystemServer(); 210 } 211 } 212 213 /** 214 * Turn off network scoring. 215 * 216 * <p>May only be called by the current scorer app, or the system. 217 * 218 * @throws SecurityException if the caller is neither the active scorer nor the system. 219 */ 220 public void disableScoring() throws SecurityException { 221 try { 222 mService.disableScoring(); 223 } catch (RemoteException e) { 224 throw e.rethrowFromSystemServer(); 225 } 226 } 227 228 /** 229 * Request scoring for networks. 230 * 231 * <p>Note that this is just a helper method to assemble the broadcast, and will run in the 232 * calling process. 233 * 234 * @return true if the broadcast was sent, or false if there is no active scorer. 235 * @throws SecurityException if the caller does not hold the 236 * {@link android.Manifest.permission#BROADCAST_NETWORK_PRIVILEGED} permission. 237 * @hide 238 */ 239 public boolean requestScores(NetworkKey[] networks) throws SecurityException { 240 String activeScorer = getActiveScorerPackage(); 241 if (activeScorer == null) { 242 return false; 243 } 244 Intent intent = new Intent(ACTION_SCORE_NETWORKS); 245 intent.setPackage(activeScorer); 246 intent.setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT); 247 intent.putExtra(EXTRA_NETWORKS_TO_SCORE, networks); 248 // A scorer should never become active if its package doesn't hold SCORE_NETWORKS, but 249 // ensure the package still holds it to be extra safe. 250 // TODO: http://b/23422763 251 mContext.sendBroadcastAsUser(intent, UserHandle.SYSTEM, Manifest.permission.SCORE_NETWORKS); 252 return true; 253 } 254 255 /** 256 * Register a network score cache. 257 * 258 * @param networkType the type of network this cache can handle. See {@link NetworkKey#type}. 259 * @param scoreCache implementation of {@link INetworkScoreCache} to store the scores. 260 * @throws SecurityException if the caller does not hold the 261 * {@link android.Manifest.permission#BROADCAST_NETWORK_PRIVILEGED} permission. 262 * @throws IllegalArgumentException if a score cache is already registered for this type. 263 * @hide 264 */ 265 public void registerNetworkScoreCache(int networkType, INetworkScoreCache scoreCache) { 266 try { 267 mService.registerNetworkScoreCache(networkType, scoreCache); 268 } catch (RemoteException e) { 269 throw e.rethrowFromSystemServer(); 270 } 271 } 272 } 273
