1/*
2 * Copyright (C) 2017 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 android.telephony.mbms;
18
19import android.content.ComponentName;
20import android.content.Context;
21import android.content.Intent;
22import android.content.ServiceConnection;
23import android.content.pm.*;
24import android.content.pm.ServiceInfo;
25import android.telephony.MbmsDownloadSession;
26import android.telephony.MbmsStreamingSession;
27import android.util.Log;
28
29import java.io.File;
30import java.io.IOException;
31import java.util.List;
32
33/**
34 * @hide
35 */
36public class MbmsUtils {
37    private static final String LOG_TAG = "MbmsUtils";
38
39    public static boolean isContainedIn(File parent, File child) {
40        try {
41            String parentPath = parent.getCanonicalPath();
42            String childPath = child.getCanonicalPath();
43            return childPath.startsWith(parentPath);
44        } catch (IOException e) {
45            throw new RuntimeException("Failed to resolve canonical paths: " + e);
46        }
47    }
48
49    public static ComponentName toComponentName(ComponentInfo ci) {
50        return new ComponentName(ci.packageName, ci.name);
51    }
52
53    public static ComponentName getOverrideServiceName(Context context, String serviceAction) {
54        String metaDataKey = null;
55        switch (serviceAction) {
56            case MbmsDownloadSession.MBMS_DOWNLOAD_SERVICE_ACTION:
57                metaDataKey = MbmsDownloadSession.MBMS_DOWNLOAD_SERVICE_OVERRIDE_METADATA;
58                break;
59            case MbmsStreamingSession.MBMS_STREAMING_SERVICE_ACTION:
60                metaDataKey = MbmsStreamingSession.MBMS_STREAMING_SERVICE_OVERRIDE_METADATA;
61                break;
62        }
63        if (metaDataKey == null) {
64            return null;
65        }
66
67        ApplicationInfo appInfo;
68        try {
69            appInfo = context.getPackageManager()
70                    .getApplicationInfo(context.getPackageName(), PackageManager.GET_META_DATA);
71        } catch (PackageManager.NameNotFoundException e) {
72            return null;
73        }
74        if (appInfo.metaData == null) {
75            return null;
76        }
77        String serviceComponent = appInfo.metaData.getString(metaDataKey);
78        if (serviceComponent == null) {
79            return null;
80        }
81        return ComponentName.unflattenFromString(serviceComponent);
82    }
83
84    public static ServiceInfo getMiddlewareServiceInfo(Context context, String serviceAction) {
85        // Query for the proper service
86        PackageManager packageManager = context.getPackageManager();
87        Intent queryIntent = new Intent();
88        queryIntent.setAction(serviceAction);
89
90        ComponentName overrideService = getOverrideServiceName(context, serviceAction);
91        List<ResolveInfo> services;
92        if (overrideService == null) {
93            services = packageManager.queryIntentServices(queryIntent,
94                    PackageManager.MATCH_SYSTEM_ONLY);
95        } else {
96            queryIntent.setComponent(overrideService);
97            services = packageManager.queryIntentServices(queryIntent,
98                    PackageManager.MATCH_ALL);
99        }
100
101        if (services == null || services.size() == 0) {
102            Log.w(LOG_TAG, "No MBMS services found, cannot get service info");
103            return null;
104        }
105
106        if (services.size() > 1) {
107            Log.w(LOG_TAG, "More than one MBMS service found, cannot get unique service");
108            return null;
109        }
110        return services.get(0).serviceInfo;
111    }
112
113    public static int startBinding(Context context, String serviceAction,
114            ServiceConnection serviceConnection) {
115        Intent bindIntent = new Intent();
116        ServiceInfo mbmsServiceInfo =
117                MbmsUtils.getMiddlewareServiceInfo(context, serviceAction);
118
119        if (mbmsServiceInfo == null) {
120            return MbmsErrors.ERROR_NO_UNIQUE_MIDDLEWARE;
121        }
122
123        bindIntent.setComponent(MbmsUtils.toComponentName(mbmsServiceInfo));
124
125        context.bindService(bindIntent, serviceConnection, Context.BIND_AUTO_CREATE);
126        return MbmsErrors.SUCCESS;
127    }
128
129    /**
130     * Returns a File linked to the directory used to store temp files for this file service
131     */
132    public static File getEmbmsTempFileDirForService(Context context, String serviceId) {
133        // Replace all non-alphanumerics/underscores with an underscore. Some filesystems don't
134        // like special characters.
135        String sanitizedServiceId = serviceId.replaceAll("[^a-zA-Z0-9_]", "_");
136
137        File embmsTempFileDir = MbmsTempFileProvider.getEmbmsTempFileDir(context);
138
139        return new File(embmsTempFileDir, sanitizedServiceId);
140    }
141}
142