| /* |
| * 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 android.net.wifi.aware; |
| |
| import android.net.NetworkSpecifier; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| import android.util.Log; |
| |
| import libcore.util.HexEncoding; |
| |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| import java.util.Arrays; |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.StringJoiner; |
| |
| /** |
| * A network specifier object used to represent the capabilities of an network agent. A collection |
| * of multiple WifiAwareNetworkSpecifier objects whose matching critiera (satisfiedBy) is an OR: |
| * a match on any of the network specifiers in the collection is a match. |
| * |
| * This class is not intended for use in network requests. |
| * |
| * @hide |
| */ |
| public class WifiAwareAgentNetworkSpecifier extends NetworkSpecifier implements Parcelable { |
| private static final String TAG = "WifiAwareAgentNs"; |
| |
| private static final boolean VDBG = false; // STOPSHIP if true |
| |
| private Set<ByteArrayWrapper> mNetworkSpecifiers = new HashSet<>(); |
| private MessageDigest mDigester; |
| |
| public WifiAwareAgentNetworkSpecifier() { |
| initialize(); |
| } |
| |
| public WifiAwareAgentNetworkSpecifier(WifiAwareNetworkSpecifier ns) { |
| initialize(); |
| mNetworkSpecifiers.add(convert(ns)); |
| } |
| |
| public WifiAwareAgentNetworkSpecifier(WifiAwareNetworkSpecifier[] nss) { |
| initialize(); |
| for (WifiAwareNetworkSpecifier ns : nss) { |
| mNetworkSpecifiers.add(convert(ns)); |
| } |
| } |
| |
| public boolean isEmpty() { |
| return mNetworkSpecifiers.isEmpty(); |
| } |
| |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| @Override |
| public void writeToParcel(Parcel dest, int flags) { |
| dest.writeArray(mNetworkSpecifiers.toArray()); |
| } |
| |
| public static final Creator<WifiAwareAgentNetworkSpecifier> CREATOR = |
| new Creator<WifiAwareAgentNetworkSpecifier>() { |
| @Override |
| public WifiAwareAgentNetworkSpecifier createFromParcel(Parcel in) { |
| WifiAwareAgentNetworkSpecifier agentNs = new WifiAwareAgentNetworkSpecifier(); |
| Object[] objs = in.readArray(null); |
| for (Object obj : objs) { |
| agentNs.mNetworkSpecifiers.add((ByteArrayWrapper) obj); |
| } |
| return agentNs; |
| } |
| |
| @Override |
| public WifiAwareAgentNetworkSpecifier[] newArray(int size) { |
| return new WifiAwareAgentNetworkSpecifier[size]; |
| } |
| }; |
| |
| @Override |
| public int hashCode() { |
| return mNetworkSpecifiers.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == this) { |
| return true; |
| } |
| if (!(obj instanceof WifiAwareAgentNetworkSpecifier)) { |
| return false; |
| } |
| return mNetworkSpecifiers.equals(((WifiAwareAgentNetworkSpecifier) obj).mNetworkSpecifiers); |
| } |
| |
| @Override |
| public String toString() { |
| StringJoiner sj = new StringJoiner(","); |
| for (ByteArrayWrapper baw: mNetworkSpecifiers) { |
| sj.add(baw.toString()); |
| } |
| return sj.toString(); |
| } |
| |
| @Override |
| public boolean satisfiedBy(NetworkSpecifier other) { |
| if (!(other instanceof WifiAwareAgentNetworkSpecifier)) { |
| return false; |
| } |
| WifiAwareAgentNetworkSpecifier otherNs = (WifiAwareAgentNetworkSpecifier) other; |
| |
| // called as old.satifiedBy(new): satisfied if old contained in new |
| for (ByteArrayWrapper baw: mNetworkSpecifiers) { |
| if (!otherNs.mNetworkSpecifiers.contains(baw)) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| public boolean satisfiesAwareNetworkSpecifier(WifiAwareNetworkSpecifier ns) { |
| if (VDBG) Log.v(TAG, "satisfiesAwareNetworkSpecifier: ns=" + ns); |
| ByteArrayWrapper nsBytes = convert(ns); |
| return mNetworkSpecifiers.contains(nsBytes); |
| } |
| |
| @Override |
| public void assertValidFromUid(int requestorUid) { |
| throw new SecurityException( |
| "WifiAwareAgentNetworkSpecifier should not be used in network requests"); |
| } |
| |
| @Override |
| public NetworkSpecifier redact() { |
| return null; |
| } |
| |
| private void initialize() { |
| try { |
| mDigester = MessageDigest.getInstance("SHA-256"); |
| } catch (NoSuchAlgorithmException e) { |
| Log.e(TAG, "Can not instantiate a SHA-256 digester!? Will match nothing."); |
| return; |
| } |
| } |
| |
| private ByteArrayWrapper convert(WifiAwareNetworkSpecifier ns) { |
| if (mDigester == null) { |
| return null; |
| } |
| |
| Parcel parcel = Parcel.obtain(); |
| ns.writeToParcel(parcel, 0); |
| byte[] bytes = parcel.marshall(); |
| |
| mDigester.reset(); |
| mDigester.update(bytes); |
| return new ByteArrayWrapper(mDigester.digest()); |
| } |
| |
| private static class ByteArrayWrapper implements Parcelable { |
| private byte[] mData; |
| |
| ByteArrayWrapper(byte[] data) { |
| mData = data; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Arrays.hashCode(mData); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == this) { |
| return true; |
| } |
| if (!(obj instanceof ByteArrayWrapper)) { |
| return false; |
| } |
| return Arrays.equals(((ByteArrayWrapper) obj).mData, mData); |
| } |
| |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| @Override |
| public void writeToParcel(Parcel dest, int flags) { |
| dest.writeBlob(mData); |
| } |
| |
| public static final Creator<ByteArrayWrapper> CREATOR = |
| new Creator<ByteArrayWrapper>() { |
| @Override |
| public ByteArrayWrapper createFromParcel(Parcel in) { |
| return new ByteArrayWrapper(in.readBlob()); |
| } |
| |
| @Override |
| public ByteArrayWrapper[] newArray(int size) { |
| return new ByteArrayWrapper[size]; |
| } |
| }; |
| |
| @Override |
| public String toString() { |
| return new String(HexEncoding.encode(mData)); |
| } |
| } |
| } |