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      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_DISCLAIMERS;
     19 import static android.app.admin.DevicePolicyManager.EXTRA_PROVISIONING_DISCLAIMER_CONTENT;
     20 import static android.app.admin.DevicePolicyManager.EXTRA_PROVISIONING_DISCLAIMER_HEADER;
     21 import static com.android.managedprovisioning.common.StoreUtils.DIR_PROVISIONING_PARAMS_FILE_CACHE;
     22 
     23 import android.content.Context;
     24 import android.net.Uri;
     25 import android.os.Bundle;
     26 import android.os.Parcelable;
     27 import android.support.annotation.Nullable;
     28 import android.support.annotation.VisibleForTesting;
     29 import android.text.TextUtils;
     30 import com.android.managedprovisioning.common.ProvisionLogger;
     31 import com.android.managedprovisioning.common.StoreUtils;
     32 import com.android.managedprovisioning.model.DisclaimersParam;
     33 import com.android.managedprovisioning.model.DisclaimersParam.Disclaimer;
     34 import java.io.File;
     35 import java.util.ArrayList;
     36 import java.util.List;
     37 
     38 /**
     39  * Parser for {@link EXTRA_PROVISIONING_DISCLAIMERS} into {@link DisclaimersParam}
     40  * It also saves the disclaimer content into files
     41  */
     42 public class DisclaimersParser {
     43     private static final int MAX_LENGTH = 3;
     44 
     45     private final Context mContext;
     46     private final long mProvisioningId;
     47     private final File mDisclaimerDir;
     48 
     49     public DisclaimersParser(Context context, long provisioningId) {
     50         mContext = context;
     51         mProvisioningId = provisioningId;
     52         mDisclaimerDir =  new File(mContext.getFilesDir(), DIR_PROVISIONING_PARAMS_FILE_CACHE);
     53     }
     54 
     55     @Nullable
     56     public DisclaimersParam parse(Parcelable[] parcelables) throws ClassCastException {
     57         if (parcelables == null) {
     58             return null;
     59         }
     60 
     61         List<Disclaimer> disclaimers = new ArrayList<>(MAX_LENGTH);
     62         for (int i = 0; i < parcelables.length; i++) {
     63             // maximum 3 disclaimers are accepted in the EXTRA_PROVISIONING_DISCLAIMERS API
     64             if (disclaimers.size() >= MAX_LENGTH) {
     65                 break;
     66             }
     67             final Bundle disclaimerBundle = (Bundle) parcelables[i];
     68             final String header = disclaimerBundle.getString(EXTRA_PROVISIONING_DISCLAIMER_HEADER);
     69             final Uri uri = disclaimerBundle.getParcelable(EXTRA_PROVISIONING_DISCLAIMER_CONTENT);
     70             if (TextUtils.isEmpty(header)) {
     71                 ProvisionLogger.logw("Empty disclaimer header in " + i + " element");
     72                 continue;
     73             }
     74 
     75             if (uri == null) {
     76                 ProvisionLogger.logw("Null disclaimer content uri in " + i + " element");
     77                 continue;
     78             }
     79 
     80             File disclaimerFile = saveDisclaimerContentIntoFile(uri, i);
     81 
     82             if (disclaimerFile == null) {
     83                 ProvisionLogger.logw("Failed to copy disclaimer uri in " + i + " element");
     84                 continue;
     85             }
     86 
     87             disclaimers.add(new Disclaimer(header, disclaimerFile.getPath()));
     88         }
     89         return disclaimers.isEmpty() ? null : new DisclaimersParam.Builder()
     90                 .setDisclaimers(disclaimers.toArray(new Disclaimer[disclaimers.size()])).build();
     91     }
     92 
     93     /**
     94      * @return {@link File} if the uri content is saved into the file successfully. Otherwise,
     95      * return null.
     96      */
     97     private File saveDisclaimerContentIntoFile(Uri uri, int index) {
     98         if (!mDisclaimerDir.exists()) {
     99             mDisclaimerDir.mkdirs();
    100         }
    101 
    102         String filename = "disclaimer_content_" + mProvisioningId + "_" + index + ".txt";
    103         File outputFile = new File(mDisclaimerDir, filename);
    104 
    105         boolean success = StoreUtils.copyUriIntoFile(mContext.getContentResolver(), uri,
    106                 outputFile);
    107         return success ? outputFile : null;
    108     }
    109 }
    110