| /* |
| * Copyright (C) 2015 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.content.pm; |
| |
| import android.annotation.NonNull; |
| import android.annotation.SystemApi; |
| import android.content.IntentFilter; |
| import android.net.Uri; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Locale; |
| |
| /** |
| * Information about an ephemeral application. |
| * @hide |
| */ |
| @SystemApi |
| public final class EphemeralResolveInfo implements Parcelable { |
| /** Algorithm that will be used to generate the domain digest */ |
| public static final String SHA_ALGORITHM = "SHA-256"; |
| |
| private final EphemeralDigest mDigest; |
| private final String mPackageName; |
| /** The filters used to match domain */ |
| private final List<IntentFilter> mFilters = new ArrayList<IntentFilter>(); |
| |
| public EphemeralResolveInfo(@NonNull Uri uri, @NonNull String packageName, |
| @NonNull List<IntentFilter> filters) { |
| // validate arguments |
| if (uri == null |
| || packageName == null |
| || filters == null |
| || filters.size() == 0) { |
| throw new IllegalArgumentException(); |
| } |
| |
| mDigest = new EphemeralDigest(uri, 0xFFFFFFFF, -1); |
| mFilters.addAll(filters); |
| mPackageName = packageName; |
| } |
| |
| EphemeralResolveInfo(Parcel in) { |
| mDigest = in.readParcelable(null /*loader*/); |
| mPackageName = in.readString(); |
| in.readList(mFilters, null /*loader*/); |
| } |
| |
| public byte[] getDigestBytes() { |
| return mDigest.getDigestBytes()[0]; |
| } |
| |
| public int getDigestPrefix() { |
| return mDigest.getDigestPrefix()[0]; |
| } |
| |
| public String getPackageName() { |
| return mPackageName; |
| } |
| |
| public List<IntentFilter> getFilters() { |
| return mFilters; |
| } |
| |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| @Override |
| public void writeToParcel(Parcel out, int flags) { |
| out.writeParcelable(mDigest, flags); |
| out.writeString(mPackageName); |
| out.writeList(mFilters); |
| } |
| |
| public static final Parcelable.Creator<EphemeralResolveInfo> CREATOR |
| = new Parcelable.Creator<EphemeralResolveInfo>() { |
| public EphemeralResolveInfo createFromParcel(Parcel in) { |
| return new EphemeralResolveInfo(in); |
| } |
| |
| public EphemeralResolveInfo[] newArray(int size) { |
| return new EphemeralResolveInfo[size]; |
| } |
| }; |
| |
| /** @hide */ |
| public static final class EphemeralResolveIntentInfo extends IntentFilter { |
| private final EphemeralResolveInfo mResolveInfo; |
| |
| public EphemeralResolveIntentInfo(@NonNull IntentFilter orig, |
| @NonNull EphemeralResolveInfo resolveInfo) { |
| super(orig); |
| this.mResolveInfo = resolveInfo; |
| } |
| |
| public EphemeralResolveInfo getEphemeralResolveInfo() { |
| return mResolveInfo; |
| } |
| } |
| |
| /** |
| * Helper class to generate and store each of the digests and prefixes |
| * sent to the Ephemeral Resolver. |
| * <p> |
| * Since intent filters may want to handle multiple hosts within a |
| * domain [eg “*.google.com”], the resolver is presented with multiple |
| * hash prefixes. For example, "a.b.c.d.e" generates digests for |
| * "d.e", "c.d.e", "b.c.d.e" and "a.b.c.d.e". |
| * |
| * @hide |
| */ |
| public static final class EphemeralDigest implements Parcelable { |
| /** Full digest of the domain hashes */ |
| private final byte[][] mDigestBytes; |
| /** The first 4 bytes of the domain hashes */ |
| private final int[] mDigestPrefix; |
| |
| public EphemeralDigest(@NonNull Uri uri, int digestMask, int maxDigests) { |
| if (uri == null) { |
| throw new IllegalArgumentException(); |
| } |
| mDigestBytes = generateDigest(uri, maxDigests); |
| mDigestPrefix = new int[mDigestBytes.length]; |
| for (int i = 0; i < mDigestBytes.length; i++) { |
| mDigestPrefix[i] = |
| ((mDigestBytes[i][0] & 0xFF) << 24 |
| | (mDigestBytes[i][1] & 0xFF) << 16 |
| | (mDigestBytes[i][2] & 0xFF) << 8 |
| | (mDigestBytes[i][3] & 0xFF) << 0) |
| & digestMask; |
| } |
| } |
| |
| private static byte[][] generateDigest(Uri uri, int maxDigests) { |
| ArrayList<byte[]> digests = new ArrayList<>(); |
| try { |
| final String host = uri.getHost().toLowerCase(Locale.ENGLISH); |
| final MessageDigest digest = MessageDigest.getInstance(SHA_ALGORITHM); |
| if (maxDigests <= 0) { |
| final byte[] hostBytes = host.getBytes(); |
| digests.add(digest.digest(hostBytes)); |
| } else { |
| int prevDot = host.lastIndexOf('.'); |
| prevDot = host.lastIndexOf('.', prevDot - 1); |
| // shortcut for short URLs |
| if (prevDot < 0) { |
| digests.add(digest.digest(host.getBytes())); |
| } else { |
| byte[] hostBytes = host.substring(prevDot + 1, host.length()).getBytes(); |
| digests.add(digest.digest(hostBytes)); |
| int digestCount = 1; |
| while (prevDot >= 0 && digestCount < maxDigests) { |
| prevDot = host.lastIndexOf('.', prevDot - 1); |
| hostBytes = host.substring(prevDot + 1, host.length()).getBytes(); |
| digests.add(digest.digest(hostBytes)); |
| digestCount++; |
| } |
| } |
| } |
| } catch (NoSuchAlgorithmException e) { |
| throw new IllegalStateException("could not find digest algorithm"); |
| } |
| return digests.toArray(new byte[digests.size()][]); |
| } |
| |
| EphemeralDigest(Parcel in) { |
| final int digestCount = in.readInt(); |
| if (digestCount == -1) { |
| mDigestBytes = null; |
| } else { |
| mDigestBytes = new byte[digestCount][]; |
| for (int i = 0; i < digestCount; i++) { |
| mDigestBytes[i] = in.createByteArray(); |
| } |
| } |
| mDigestPrefix = in.createIntArray(); |
| } |
| |
| public byte[][] getDigestBytes() { |
| return mDigestBytes; |
| } |
| |
| public int[] getDigestPrefix() { |
| return mDigestPrefix; |
| } |
| |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| @Override |
| public void writeToParcel(Parcel out, int flags) { |
| if (mDigestBytes == null) { |
| out.writeInt(-1); |
| } else { |
| out.writeInt(mDigestBytes.length); |
| for (int i = 0; i < mDigestBytes.length; i++) { |
| out.writeByteArray(mDigestBytes[i]); |
| } |
| } |
| out.writeIntArray(mDigestPrefix); |
| } |
| |
| @SuppressWarnings("hiding") |
| public static final Parcelable.Creator<EphemeralDigest> CREATOR = |
| new Parcelable.Creator<EphemeralDigest>() { |
| public EphemeralDigest createFromParcel(Parcel in) { |
| return new EphemeralDigest(in); |
| } |
| |
| public EphemeralDigest[] newArray(int size) { |
| return new EphemeralDigest[size]; |
| } |
| }; |
| } |
| } |