1 /*
2  * Copyright 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 package com.android.managedprovisioning.parser;
17 
18 import static android.app.admin.DevicePolicyManager.EXTRA_PROVISIONING_DISCLAIMER_CONTENT;
19 import static android.app.admin.DevicePolicyManager.EXTRA_PROVISIONING_DISCLAIMER_HEADER;
20 import static com.android.managedprovisioning.common.StoreUtils.DIR_PROVISIONING_PARAMS_FILE_CACHE;
21 
22 import android.content.Context;
23 import android.net.Uri;
24 import android.os.Bundle;
25 import android.os.Parcelable;
26 import androidx.annotation.Nullable;
27 
28 import android.text.TextUtils;
29 import com.android.managedprovisioning.common.ProvisionLogger;
30 import com.android.managedprovisioning.common.StoreUtils;
31 import com.android.managedprovisioning.model.DisclaimersParam;
32 import com.android.managedprovisioning.model.DisclaimersParam.Disclaimer;
33 import java.io.File;
34 import java.util.ArrayList;
35 import java.util.List;
36 
37 /**
38  * Parser for {@link EXTRA_PROVISIONING_DISCLAIMERS} into {@link DisclaimersParam}
39  * It also saves the disclaimer content into files
40  */
41 public class DisclaimersParserImpl implements DisclaimerParser {
42     private static final int MAX_LENGTH = 3;
43 
44     private final Context mContext;
45     private final long mProvisioningId;
46     private final File mDisclaimerDir;
47 
DisclaimersParserImpl(Context context, long provisioningId)48     public DisclaimersParserImpl(Context context, long provisioningId) {
49         mContext = context;
50         mProvisioningId = provisioningId;
51         mDisclaimerDir =  new File(mContext.getFilesDir(), DIR_PROVISIONING_PARAMS_FILE_CACHE);
52     }
53 
54     @Nullable
parse(Parcelable[] parcelables)55     public DisclaimersParam parse(Parcelable[] parcelables) throws ClassCastException {
56         if (parcelables == null) {
57             return null;
58         }
59 
60         List<Disclaimer> disclaimers = new ArrayList<>(MAX_LENGTH);
61         for (int i = 0; i < parcelables.length; i++) {
62             // maximum 3 disclaimers are accepted in the EXTRA_PROVISIONING_DISCLAIMERS API
63             if (disclaimers.size() >= MAX_LENGTH) {
64                 break;
65             }
66             final Bundle disclaimerBundle = (Bundle) parcelables[i];
67             final String header = disclaimerBundle.getString(EXTRA_PROVISIONING_DISCLAIMER_HEADER);
68             final Uri uri = disclaimerBundle.getParcelable(EXTRA_PROVISIONING_DISCLAIMER_CONTENT);
69             if (TextUtils.isEmpty(header)) {
70                 ProvisionLogger.logw("Empty disclaimer header in " + i + " element");
71                 continue;
72             }
73 
74             if (uri == null) {
75                 ProvisionLogger.logw("Null disclaimer content uri in " + i + " element");
76                 continue;
77             }
78 
79             File disclaimerFile = saveDisclaimerContentIntoFile(uri, i);
80 
81             if (disclaimerFile == null) {
82                 ProvisionLogger.logw("Failed to copy disclaimer uri in " + i + " element");
83                 continue;
84             }
85 
86             disclaimers.add(new Disclaimer(header, disclaimerFile.getPath()));
87         }
88         return disclaimers.isEmpty() ? null : new DisclaimersParam.Builder()
89                 .setDisclaimers(disclaimers.toArray(new Disclaimer[disclaimers.size()])).build();
90     }
91 
92     /**
93      * @return {@link File} if the uri content is saved into the file successfully. Otherwise,
94      * return null.
95      */
saveDisclaimerContentIntoFile(Uri uri, int index)96     private File saveDisclaimerContentIntoFile(Uri uri, int index) {
97         if (!mDisclaimerDir.exists()) {
98             mDisclaimerDir.mkdirs();
99         }
100 
101         String filename = "disclaimer_content_" + mProvisioningId + "_" + index + ".txt";
102         File outputFile = new File(mDisclaimerDir, filename);
103 
104         boolean success = StoreUtils.copyUriIntoFile(mContext.getContentResolver(), uri,
105                 outputFile);
106         return success ? outputFile : null;
107     }
108 }
109