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
17package com.android.server.pm;
18
19import com.android.internal.util.XmlUtils;
20import org.xmlpull.v1.XmlPullParser;
21import org.xmlpull.v1.XmlPullParserException;
22import org.xmlpull.v1.XmlSerializer;
23import android.content.IntentFilter;
24import android.util.Log;
25import java.io.IOException;
26import 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 */
33class 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_PACKAGE = "ownerPackage";
37    private static final String ATTR_FILTER = "filter";
38
39    private static final String TAG = "CrossProfileIntentFilter";
40
41    // If the intent matches the IntentFilter, then it can be forwarded to this userId.
42    final int mTargetUserId;
43    final String mOwnerPackage; // packageName of the app.
44    final int mFlags;
45
46    CrossProfileIntentFilter(IntentFilter filter, String ownerPackage, int targetUserId,
47            int flags) {
48        super(filter);
49        mTargetUserId = targetUserId;
50        mOwnerPackage = ownerPackage;
51        mFlags = flags;
52    }
53
54    public int getTargetUserId() {
55        return mTargetUserId;
56    }
57
58    public int getFlags() {
59        return mFlags;
60    }
61
62    public String getOwnerPackage() {
63        return mOwnerPackage;
64    }
65
66    CrossProfileIntentFilter(XmlPullParser parser) throws XmlPullParserException, IOException {
67        mTargetUserId = getIntFromXml(parser, ATTR_TARGET_USER_ID, UserHandle.USER_NULL);
68        mOwnerPackage = getStringFromXml(parser, ATTR_OWNER_PACKAGE, "");
69        mFlags = getIntFromXml(parser, ATTR_FLAGS, 0);
70
71        int outerDepth = parser.getDepth();
72        String tagName = parser.getName();
73        int type;
74        while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
75                && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) {
76            tagName = parser.getName();
77            if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) {
78                continue;
79            } else if (type == XmlPullParser.START_TAG) {
80                if (tagName.equals(ATTR_FILTER)) {
81                    break;
82                } else {
83                    String msg = "Unknown element under "
84                            + Settings.TAG_CROSS_PROFILE_INTENT_FILTERS + ": " + tagName + " at "
85                            + parser.getPositionDescription();
86                    PackageManagerService.reportSettingsProblem(Log.WARN, msg);
87                    XmlUtils.skipCurrentTag(parser);
88                }
89            }
90        }
91        if (tagName.equals(ATTR_FILTER)) {
92            readFromXml(parser);
93        } else {
94            String msg = "Missing element under " + TAG + ": " + ATTR_FILTER +
95                    " at " + parser.getPositionDescription();
96            PackageManagerService.reportSettingsProblem(Log.WARN, msg);
97            XmlUtils.skipCurrentTag(parser);
98        }
99    }
100
101    String getStringFromXml(XmlPullParser parser, String attribute, String defaultValue) {
102        String value = parser.getAttributeValue(null, attribute);
103        if (value == null) {
104            String msg = "Missing element under " + TAG +": " + attribute + " at " +
105                    parser.getPositionDescription();
106            PackageManagerService.reportSettingsProblem(Log.WARN, msg);
107            return defaultValue;
108        } else {
109            return value;
110        }
111    }
112
113    int getIntFromXml(XmlPullParser parser, String attribute, int defaultValue) {
114        String stringValue = getStringFromXml(parser, attribute, null);
115        if (stringValue != null) {
116            return Integer.parseInt(stringValue);
117        }
118        return defaultValue;
119    }
120
121    public void writeToXml(XmlSerializer serializer) throws IOException {
122        serializer.attribute(null, ATTR_TARGET_USER_ID, Integer.toString(mTargetUserId));
123        serializer.attribute(null, ATTR_FLAGS, Integer.toString(mFlags));
124        serializer.attribute(null, ATTR_OWNER_PACKAGE, mOwnerPackage);
125        serializer.startTag(null, ATTR_FILTER);
126            super.writeToXml(serializer);
127        serializer.endTag(null, ATTR_FILTER);
128    }
129
130    @Override
131    public String toString() {
132        return "CrossProfileIntentFilter{0x" + Integer.toHexString(System.identityHashCode(this))
133                + " " + Integer.toString(mTargetUserId) + "}";
134    }
135
136    boolean equalsIgnoreFilter(CrossProfileIntentFilter other) {
137        return mTargetUserId == other.mTargetUserId
138                && mOwnerPackage.equals(other.mOwnerPackage)
139                && mFlags == other.mFlags;
140    }
141}
142