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      1 /*
      2  * Copyright (C) 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 
     17 package com.example.android.permissionrequest;
     18 
     19 import android.Manifest;
     20 import android.annotation.SuppressLint;
     21 import android.content.pm.PackageManager;
     22 import android.os.Bundle;
     23 import android.support.annotation.NonNull;
     24 import android.support.annotation.Nullable;
     25 import android.support.v4.app.DialogFragment;
     26 import android.support.v4.app.Fragment;
     27 import android.support.v4.content.ContextCompat;
     28 import android.view.LayoutInflater;
     29 import android.view.View;
     30 import android.view.ViewGroup;
     31 import android.webkit.ConsoleMessage;
     32 import android.webkit.PermissionRequest;
     33 import android.webkit.WebChromeClient;
     34 import android.webkit.WebSettings;
     35 import android.webkit.WebView;
     36 
     37 import com.example.android.common.logger.Log;
     38 
     39 /**
     40  * This fragment shows a {@link WebView} and loads a web app from the {@link SimpleWebServer}.
     41  */
     42 public class PermissionRequestFragment extends Fragment
     43         implements ConfirmationDialogFragment.Listener, MessageDialogFragment.Listener {
     44 
     45     private static final String TAG = PermissionRequestFragment.class.getSimpleName();
     46 
     47     private static final String FRAGMENT_DIALOG = "dialog";
     48 
     49     private static final int REQUEST_CAMERA_PERMISSION = 1;
     50 
     51     /**
     52      * We use this web server to serve HTML files in the assets folder. This is because we cannot
     53      * use the JavaScript method "getUserMedia" from "file:///android_assets/..." URLs.
     54      */
     55     private SimpleWebServer mWebServer;
     56 
     57     /**
     58      * A reference to the {@link WebView}.
     59      */
     60     private WebView mWebView;
     61 
     62     /**
     63      * This field stores the {@link PermissionRequest} from the web application until it is allowed
     64      * or denied by user.
     65      */
     66     private PermissionRequest mPermissionRequest;
     67 
     68     /**
     69      * For testing.
     70      */
     71     private ConsoleMonitor mConsoleMonitor;
     72 
     73     @Override
     74     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
     75             @Nullable Bundle savedInstanceState) {
     76         return inflater.inflate(R.layout.fragment_permission_request, container, false);
     77     }
     78 
     79     @Override
     80     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
     81         mWebView = (WebView) view.findViewById(R.id.web_view);
     82         // Here, we use #mWebChromeClient with implementation for handling PermissionRequests.
     83         mWebView.setWebChromeClient(mWebChromeClient);
     84         configureWebSettings(mWebView.getSettings());
     85     }
     86 
     87     @Override
     88     public void onResume() {
     89         super.onResume();
     90         final int port = 8080;
     91         mWebServer = new SimpleWebServer(port, getResources().getAssets());
     92         mWebServer.start();
     93         // This is for runtime permission on Marshmallow and above; It is not directly related to
     94         // PermissionRequest API.
     95         if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA)
     96                 != PackageManager.PERMISSION_GRANTED) {
     97             requestCameraPermission();
     98         } else {
     99             mWebView.loadUrl("http://localhost:" + port + "/sample.html");
    100         }
    101     }
    102 
    103     @Override
    104     public void onPause() {
    105         mWebServer.stop();
    106         super.onPause();
    107     }
    108 
    109     @Override
    110     public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
    111             @NonNull int[] grantResults) {
    112         // This is for runtime permission on Marshmallow and above; It is not directly related to
    113         // PermissionRequest API.
    114         if (requestCode == REQUEST_CAMERA_PERMISSION) {
    115             if (permissions.length != 1 || grantResults.length != 1 ||
    116                     grantResults[0] != PackageManager.PERMISSION_GRANTED) {
    117                 Log.e(TAG, "Camera permission not granted.");
    118             } else if (mWebView != null && mWebServer != null) {
    119                 mWebView.loadUrl("http://localhost:" + mWebServer.getPort() + "/sample.html");
    120             }
    121         } else {
    122             super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    123         }
    124     }
    125 
    126     private void requestCameraPermission() {
    127         if (shouldShowRequestPermissionRationale(Manifest.permission.CAMERA)) {
    128             MessageDialogFragment.newInstance(R.string.permission_message)
    129                     .show(getChildFragmentManager(), FRAGMENT_DIALOG);
    130         } else {
    131             requestPermissions(new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERMISSION);
    132         }
    133     }
    134 
    135     @SuppressLint("SetJavaScriptEnabled")
    136     private static void configureWebSettings(WebSettings settings) {
    137         settings.setJavaScriptEnabled(true);
    138     }
    139 
    140     /**
    141      * This {@link WebChromeClient} has implementation for handling {@link PermissionRequest}.
    142      */
    143     private WebChromeClient mWebChromeClient = new WebChromeClient() {
    144 
    145         // This method is called when the web content is requesting permission to access some
    146         // resources.
    147         @Override
    148         public void onPermissionRequest(PermissionRequest request) {
    149             Log.i(TAG, "onPermissionRequest");
    150             mPermissionRequest = request;
    151             final String[] requestedResources = request.getResources();
    152             for (String r : requestedResources) {
    153                 if (r.equals(PermissionRequest.RESOURCE_VIDEO_CAPTURE)) {
    154                     // In this sample, we only accept video capture request.
    155                     ConfirmationDialogFragment
    156                             .newInstance(new String[]{PermissionRequest.RESOURCE_VIDEO_CAPTURE})
    157                             .show(getChildFragmentManager(), FRAGMENT_DIALOG);
    158                     break;
    159                 }
    160             }
    161         }
    162 
    163         // This method is called when the permission request is canceled by the web content.
    164         @Override
    165         public void onPermissionRequestCanceled(PermissionRequest request) {
    166             Log.i(TAG, "onPermissionRequestCanceled");
    167             // We dismiss the prompt UI here as the request is no longer valid.
    168             mPermissionRequest = null;
    169             DialogFragment fragment = (DialogFragment) getChildFragmentManager()
    170                     .findFragmentByTag(FRAGMENT_DIALOG);
    171             if (null != fragment) {
    172                 fragment.dismiss();
    173             }
    174         }
    175 
    176         @Override
    177         public boolean onConsoleMessage(@NonNull ConsoleMessage message) {
    178             switch (message.messageLevel()) {
    179                 case TIP:
    180                     Log.v(TAG, message.message());
    181                     break;
    182                 case LOG:
    183                     Log.i(TAG, message.message());
    184                     break;
    185                 case WARNING:
    186                     Log.w(TAG, message.message());
    187                     break;
    188                 case ERROR:
    189                     Log.e(TAG, message.message());
    190                     break;
    191                 case DEBUG:
    192                     Log.d(TAG, message.message());
    193                     break;
    194             }
    195             if (null != mConsoleMonitor) {
    196                 mConsoleMonitor.onConsoleMessage(message);
    197             }
    198             return true;
    199         }
    200 
    201     };
    202 
    203     @Override
    204     public void onOkClicked() {
    205         requestPermissions(new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERMISSION);
    206     }
    207 
    208     @Override
    209     public void onConfirmation(boolean allowed, String[] resources) {
    210         if (allowed) {
    211             mPermissionRequest.grant(resources);
    212             Log.d(TAG, "Permission granted.");
    213         } else {
    214             mPermissionRequest.deny();
    215             Log.d(TAG, "Permission request denied.");
    216         }
    217         mPermissionRequest = null;
    218     }
    219 
    220     public void setConsoleMonitor(ConsoleMonitor monitor) {
    221         mConsoleMonitor = monitor;
    222     }
    223 
    224     /**
    225      * For testing.
    226      */
    227     public interface ConsoleMonitor {
    228         void onConsoleMessage(ConsoleMessage message);
    229     }
    230 
    231 }
    232