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      1 /*
      2  * Copyright 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 com.android.server.pm;
     18 
     19 import com.android.internal.util.XmlUtils;
     20 import org.xmlpull.v1.XmlPullParser;
     21 import org.xmlpull.v1.XmlPullParserException;
     22 import org.xmlpull.v1.XmlSerializer;
     23 import android.content.IntentFilter;
     24 import android.util.Log;
     25 import java.io.IOException;
     26 import android.os.UserHandle;
     27 
     28 /**
     29  * The {@link PackageManagerService} maintains some {@link CrossProfileIntentFilter}s for each user.
     30  * If an {@link Intent} matches the {@link CrossProfileIntentFilter}, then activities in the user
     31  * {@link #mTargetUserId} can access it.
     32  */
     33 class CrossProfileIntentFilter extends IntentFilter {
     34     private static final String ATTR_TARGET_USER_ID = "targetUserId";
     35     private static final String ATTR_FLAGS = "flags";
     36     private static final String ATTR_OWNER_USER_ID = "ownerUserId";
     37     private static final String ATTR_OWNER_PACKAGE = "ownerPackage";
     38     private static final String ATTR_FILTER = "filter";
     39 
     40     private static final String TAG = "CrossProfileIntentFilter";
     41 
     42     // If the intent matches the IntentFilter, then it can be forwarded to this userId.
     43     final int mTargetUserId;
     44     final int mOwnerUserId; // userId of the app which has set this CrossProfileIntentFilter.
     45     final String mOwnerPackage; // packageName of the app.
     46     final int mFlags;
     47 
     48     CrossProfileIntentFilter(IntentFilter filter, String ownerPackage, int ownerUserId,
     49             int targetUserId, int flags) {
     50         super(filter);
     51         mTargetUserId = targetUserId;
     52         mOwnerUserId = ownerUserId;
     53         mOwnerPackage = ownerPackage;
     54         mFlags = flags;
     55     }
     56 
     57     public int getTargetUserId() {
     58         return mTargetUserId;
     59     }
     60 
     61     public int getFlags() {
     62         return mFlags;
     63     }
     64 
     65     public int getOwnerUserId() {
     66         return mOwnerUserId;
     67     }
     68 
     69     public String getOwnerPackage() {
     70         return mOwnerPackage;
     71     }
     72 
     73     CrossProfileIntentFilter(XmlPullParser parser) throws XmlPullParserException, IOException {
     74         mTargetUserId = getIntFromXml(parser, ATTR_TARGET_USER_ID, UserHandle.USER_NULL);
     75         mOwnerUserId = getIntFromXml(parser, ATTR_OWNER_USER_ID, UserHandle.USER_NULL);
     76         mOwnerPackage = getStringFromXml(parser, ATTR_OWNER_PACKAGE, "");
     77         mFlags = getIntFromXml(parser, ATTR_FLAGS, 0);
     78 
     79         int outerDepth = parser.getDepth();
     80         String tagName = parser.getName();
     81         int type;
     82         while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
     83                 && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) {
     84             tagName = parser.getName();
     85             if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) {
     86                 continue;
     87             } else if (type == XmlPullParser.START_TAG) {
     88                 if (tagName.equals(ATTR_FILTER)) {
     89                     break;
     90                 } else {
     91                     String msg = "Unknown element under "
     92                             + Settings.TAG_CROSS_PROFILE_INTENT_FILTERS + ": " + tagName + " at "
     93                             + parser.getPositionDescription();
     94                     PackageManagerService.reportSettingsProblem(Log.WARN, msg);
     95                     XmlUtils.skipCurrentTag(parser);
     96                 }
     97             }
     98         }
     99         if (tagName.equals(ATTR_FILTER)) {
    100             readFromXml(parser);
    101         } else {
    102             String msg = "Missing element under " + TAG + ": " + ATTR_FILTER +
    103                     " at " + parser.getPositionDescription();
    104             PackageManagerService.reportSettingsProblem(Log.WARN, msg);
    105             XmlUtils.skipCurrentTag(parser);
    106         }
    107     }
    108 
    109     String getStringFromXml(XmlPullParser parser, String attribute, String defaultValue) {
    110         String value = parser.getAttributeValue(null, attribute);
    111         if (value == null) {
    112             String msg = "Missing element under " + TAG +": " + attribute + " at " +
    113                     parser.getPositionDescription();
    114             PackageManagerService.reportSettingsProblem(Log.WARN, msg);
    115             return defaultValue;
    116         } else {
    117             return value;
    118         }
    119     }
    120 
    121     int getIntFromXml(XmlPullParser parser, String attribute, int defaultValue) {
    122         String stringValue = getStringFromXml(parser, attribute, null);
    123         if (stringValue != null) {
    124             return Integer.parseInt(stringValue);
    125         }
    126         return defaultValue;
    127     }
    128 
    129     public void writeToXml(XmlSerializer serializer) throws IOException {
    130         serializer.attribute(null, ATTR_TARGET_USER_ID, Integer.toString(mTargetUserId));
    131         serializer.attribute(null, ATTR_FLAGS, Integer.toString(mFlags));
    132         serializer.attribute(null, ATTR_OWNER_USER_ID, Integer.toString(mOwnerUserId));
    133         serializer.attribute(null, ATTR_OWNER_PACKAGE, mOwnerPackage);
    134         serializer.startTag(null, ATTR_FILTER);
    135             super.writeToXml(serializer);
    136         serializer.endTag(null, ATTR_FILTER);
    137     }
    138 
    139     @Override
    140     public String toString() {
    141         return "CrossProfileIntentFilter{0x" + Integer.toHexString(System.identityHashCode(this))
    142                 + " " + Integer.toString(mTargetUserId) + "}";
    143     }
    144 
    145     boolean equalsIgnoreFilter(CrossProfileIntentFilter other) {
    146         return mTargetUserId == other.mTargetUserId
    147                 && mOwnerUserId == other.mOwnerUserId
    148                 && mOwnerPackage.equals(other.mOwnerPackage)
    149                 && mFlags == other.mFlags;
    150     }
    151 }
    152