ResolverListController.java revision 0cef910d5e159800bacb69310a69ba04eafcd30c 
1/*
2 * Copyright (C) 2016 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
18package com.android.internal.app;
19
20import android.annotation.WorkerThread;
21import android.app.ActivityManager;
22import android.content.ComponentName;
23import android.content.Context;
24import android.content.Intent;
25import android.content.pm.ActivityInfo;
26import android.content.pm.ApplicationInfo;
27import android.content.pm.PackageManager;
28import android.content.pm.ResolveInfo;
29import android.util.Log;
30import com.android.internal.annotations.VisibleForTesting;
31
32import java.util.ArrayList;
33import java.util.Collections;
34import java.util.List;
35
36/**
37 * A helper for the ResolverActivity that exposes methods to retrieve, filter and sort its list of
38 * resolvers.
39 */
40public class ResolverListController {
41
42    private final Context mContext;
43    private final PackageManager mpm;
44    private final int mLaunchedFromUid;
45
46    // Needed for sorting resolvers.
47    private final Intent mTargetIntent;
48    private final String mReferrerPackage;
49
50    private static final String TAG = "ResolverListController";
51    private static final boolean DEBUG = false;
52
53    private ResolverComparator mResolverComparator;
54
55    public ResolverListController(
56            Context context,
57            PackageManager pm,
58            Intent targetIntent,
59            String referrerPackage,
60            int launchedFromUid) {
61        mContext = context;
62        mpm = pm;
63        mLaunchedFromUid = launchedFromUid;
64        mTargetIntent = targetIntent;
65        mReferrerPackage = referrerPackage;
66    }
67
68    @VisibleForTesting
69    public List<ResolverActivity.ResolvedComponentInfo> getResolversForIntent(
70            boolean shouldGetResolvedFilter,
71            boolean shouldGetActivityMetadata,
72            List<Intent> intents) {
73        List<ResolverActivity.ResolvedComponentInfo> resolvedComponents = null;
74        for (int i = 0, N = intents.size(); i < N; i++) {
75            final Intent intent = intents.get(i);
76            final List<ResolveInfo> infos = mpm.queryIntentActivities(intent,
77                    PackageManager.MATCH_DEFAULT_ONLY
78                            | (shouldGetResolvedFilter ? PackageManager.GET_RESOLVED_FILTER : 0)
79                            | (shouldGetActivityMetadata ? PackageManager.GET_META_DATA : 0));
80            if (infos != null) {
81                if (resolvedComponents == null) {
82                    resolvedComponents = new ArrayList<>();
83                }
84                addResolveListDedupe(resolvedComponents, intent, infos);
85            }
86        }
87        return resolvedComponents;
88    }
89
90    @VisibleForTesting
91    public void addResolveListDedupe(List<ResolverActivity.ResolvedComponentInfo> into,
92            Intent intent,
93            List<ResolveInfo> from) {
94        final int fromCount = from.size();
95        final int intoCount = into.size();
96        for (int i = 0; i < fromCount; i++) {
97            final ResolveInfo newInfo = from.get(i);
98            boolean found = false;
99            // Only loop to the end of into as it was before we started; no dupes in from.
100            for (int j = 0; j < intoCount; j++) {
101                final ResolverActivity.ResolvedComponentInfo rci = into.get(j);
102                if (isSameResolvedComponent(newInfo, rci)) {
103                    found = true;
104                    rci.add(intent, newInfo);
105                    break;
106                }
107            }
108            if (!found) {
109                final ComponentName name = new ComponentName(
110                        newInfo.activityInfo.packageName, newInfo.activityInfo.name);
111                final ResolverActivity.ResolvedComponentInfo rci =
112                        new ResolverActivity.ResolvedComponentInfo(name, intent, newInfo);
113                rci.setPinned(isComponentPinned(name));
114                into.add(rci);
115            }
116        }
117    }
118
119    // Filter out any activities that the launched uid does not have permission for.
120    //
121    // Also filter out those that are suspended because they couldn't be started. We don't do this
122    // when we have an explicit list of resolved activities, because that only happens when
123    // we are being subclassed, so we can safely launch whatever they gave us.
124    //
125    // To preserve the inputList, optionally will return the original list if any modification has
126    // been made.
127    @VisibleForTesting
128    public ArrayList<ResolverActivity.ResolvedComponentInfo> filterIneligibleActivities(
129            List<ResolverActivity.ResolvedComponentInfo> inputList,
130            boolean returnCopyOfOriginalListIfModified) {
131        ArrayList<ResolverActivity.ResolvedComponentInfo> listToReturn = null;
132        for (int i = inputList.size()-1; i >= 0; i--) {
133            ActivityInfo ai = inputList.get(i)
134                    .getResolveInfoAt(0).activityInfo;
135            int granted = ActivityManager.checkComponentPermission(
136                    ai.permission, mLaunchedFromUid,
137                    ai.applicationInfo.uid, ai.exported);
138            boolean suspended = (ai.applicationInfo.flags
139                    & ApplicationInfo.FLAG_SUSPENDED) != 0;
140            if (granted != PackageManager.PERMISSION_GRANTED || suspended
141                    || isComponentFiltered(ai.getComponentName())) {
142                // Access not allowed! We're about to filter an item,
143                // so modify the unfiltered version if it hasn't already been modified.
144                if (returnCopyOfOriginalListIfModified && listToReturn == null) {
145                    listToReturn = new ArrayList<>(inputList);
146                }
147                inputList.remove(i);
148            }
149        }
150        return listToReturn;
151    }
152
153    // Filter out any low priority items.
154    //
155    // To preserve the inputList, optionally will return the original list if any modification has
156    // been made.
157    @VisibleForTesting
158    public ArrayList<ResolverActivity.ResolvedComponentInfo> filterLowPriority(
159            List<ResolverActivity.ResolvedComponentInfo> inputList,
160            boolean returnCopyOfOriginalListIfModified) {
161        ArrayList<ResolverActivity.ResolvedComponentInfo> listToReturn = null;
162        // Only display the first matches that are either of equal
163        // priority or have asked to be default options.
164        ResolverActivity.ResolvedComponentInfo rci0 = inputList.get(0);
165        ResolveInfo r0 = rci0.getResolveInfoAt(0);
166        int N = inputList.size();
167        for (int i = 1; i < N; i++) {
168            ResolveInfo ri = inputList.get(i).getResolveInfoAt(0);
169            if (DEBUG) Log.v(
170                    TAG,
171                    r0.activityInfo.name + "=" +
172                            r0.priority + "/" + r0.isDefault + " vs " +
173                            ri.activityInfo.name + "=" +
174                            ri.priority + "/" + ri.isDefault);
175            if (r0.priority != ri.priority ||
176                    r0.isDefault != ri.isDefault) {
177                while (i < N) {
178                    if (returnCopyOfOriginalListIfModified && listToReturn == null) {
179                        listToReturn = new ArrayList<>(inputList);
180                    }
181                    inputList.remove(i);
182                    N--;
183                }
184            }
185        }
186        return listToReturn;
187    }
188
189    @VisibleForTesting
190    @WorkerThread
191    public void sort(List<ResolverActivity.ResolvedComponentInfo> inputList) {
192        if (mResolverComparator == null) {
193            mResolverComparator = new ResolverComparator(mContext, mTargetIntent, mReferrerPackage);
194        }
195        mResolverComparator.compute(inputList);
196        Collections.sort(inputList, mResolverComparator);
197    }
198
199    private static boolean isSameResolvedComponent(ResolveInfo a,
200            ResolverActivity.ResolvedComponentInfo b) {
201        final ActivityInfo ai = a.activityInfo;
202        return ai.packageName.equals(b.name.getPackageName())
203                && ai.name.equals(b.name.getClassName());
204    }
205
206    boolean isComponentPinned(ComponentName name) {
207        return false;
208    }
209
210    boolean isComponentFiltered(ComponentName componentName) {
211        return false;
212    }
213
214    @VisibleForTesting
215    public float getScore(ResolverActivity.DisplayResolveInfo target) {
216        if (mResolverComparator == null) {
217            mResolverComparator = new ResolverComparator(mContext, mTargetIntent, mReferrerPackage);
218        }
219        return mResolverComparator.getScore(target.getResolvedComponentName());
220    }
221
222    public void updateModel(ComponentName componentName) {
223        if (mResolverComparator != null) {
224            mResolverComparator.updateModel(componentName);
225        }
226    }
227}
228