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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.annotation.SuppressLint;
     20 import android.os.Bundle;
     21 import android.support.annotation.NonNull;
     22 import android.support.annotation.Nullable;
     23 import android.support.v4.app.DialogFragment;
     24 import android.support.v4.app.Fragment;
     25 import android.view.LayoutInflater;
     26 import android.view.View;
     27 import android.view.ViewGroup;
     28 import android.webkit.ConsoleMessage;
     29 import android.webkit.PermissionRequest;
     30 import android.webkit.WebChromeClient;
     31 import android.webkit.WebSettings;
     32 import android.webkit.WebView;
     33 
     34 import com.example.android.common.logger.Log;
     35 
     36 /**
     37  * This fragment shows a {@link WebView} and loads a web app from the {@link SimpleWebServer}.
     38  */
     39 public class PermissionRequestFragment extends Fragment
     40         implements ConfirmationDialogFragment.Listener {
     41 
     42     private static final String TAG = PermissionRequestFragment.class.getSimpleName();
     43 
     44     private static final String FRAGMENT_DIALOG = "dialog";
     45 
     46     /**
     47      * We use this web server to serve HTML files in the assets folder. This is because we cannot
     48      * use the JavaScript method "getUserMedia" from "file:///android_assets/..." URLs.
     49      */
     50     private SimpleWebServer mWebServer;
     51 
     52     /**
     53      * A reference to the {@link WebView}.
     54      */
     55     private WebView mWebView;
     56 
     57     /**
     58      * This field stores the {@link PermissionRequest} from the web application until it is allowed
     59      * or denied by user.
     60      */
     61     private PermissionRequest mPermissionRequest;
     62 
     63     /**
     64      * For testing.
     65      */
     66     private ConsoleMonitor mConsoleMonitor;
     67 
     68     @Override
     69     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
     70                              @Nullable Bundle savedInstanceState) {
     71         return inflater.inflate(R.layout.fragment_permission_request, container, false);
     72     }
     73 
     74     @Override
     75     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
     76         mWebView = (WebView) view.findViewById(R.id.web_view);
     77         // Here, we use #mWebChromeClient with implementation for handling PermissionRequests.
     78         mWebView.setWebChromeClient(mWebChromeClient);
     79         configureWebSettings(mWebView.getSettings());
     80     }
     81 
     82     @Override
     83     public void onResume() {
     84         super.onResume();
     85         final int port = 8080;
     86         mWebServer = new SimpleWebServer(port, getResources().getAssets());
     87         mWebServer.start();
     88         mWebView.loadUrl("http://localhost:" + port + "/sample.html");
     89     }
     90 
     91     @Override
     92     public void onPause() {
     93         mWebServer.stop();
     94         super.onPause();
     95     }
     96 
     97     @SuppressLint("SetJavaScriptEnabled")
     98     private static void configureWebSettings(WebSettings settings) {
     99         settings.setJavaScriptEnabled(true);
    100     }
    101 
    102     /**
    103      * This {@link WebChromeClient} has implementation for handling {@link PermissionRequest}.
    104      */
    105     private WebChromeClient mWebChromeClient = new WebChromeClient() {
    106 
    107         // This method is called when the web content is requesting permission to access some
    108         // resources.
    109         @Override
    110         public void onPermissionRequest(PermissionRequest request) {
    111             Log.i(TAG, "onPermissionRequest");
    112             mPermissionRequest = request;
    113             ConfirmationDialogFragment.newInstance(request.getResources())
    114                     .show(getChildFragmentManager(), FRAGMENT_DIALOG);
    115         }
    116 
    117         // This method is called when the permission request is canceled by the web content.
    118         @Override
    119         public void onPermissionRequestCanceled(PermissionRequest request) {
    120             Log.i(TAG, "onPermissionRequestCanceled");
    121             // We dismiss the prompt UI here as the request is no longer valid.
    122             mPermissionRequest = null;
    123             DialogFragment fragment = (DialogFragment) getChildFragmentManager()
    124                     .findFragmentByTag(FRAGMENT_DIALOG);
    125             if (null != fragment) {
    126                 fragment.dismiss();
    127             }
    128         }
    129 
    130         @Override
    131         public boolean onConsoleMessage(@NonNull ConsoleMessage message) {
    132             switch (message.messageLevel()) {
    133                 case TIP:
    134                     Log.v(TAG, message.message());
    135                     break;
    136                 case LOG:
    137                     Log.i(TAG, message.message());
    138                     break;
    139                 case WARNING:
    140                     Log.w(TAG, message.message());
    141                     break;
    142                 case ERROR:
    143                     Log.e(TAG, message.message());
    144                     break;
    145                 case DEBUG:
    146                     Log.d(TAG, message.message());
    147                     break;
    148             }
    149             if (null != mConsoleMonitor) {
    150                 mConsoleMonitor.onConsoleMessage(message);
    151             }
    152             return true;
    153         }
    154 
    155     };
    156 
    157     @Override
    158     public void onConfirmation(boolean allowed) {
    159         if (allowed) {
    160             mPermissionRequest.grant(mPermissionRequest.getResources());
    161             Log.d(TAG, "Permission granted.");
    162         } else {
    163             mPermissionRequest.deny();
    164             Log.d(TAG, "Permission request denied.");
    165         }
    166         mPermissionRequest = null;
    167     }
    168 
    169     public void setConsoleMonitor(ConsoleMonitor monitor) {
    170         mConsoleMonitor = monitor;
    171     }
    172 
    173     /**
    174      * For testing.
    175      */
    176     public interface ConsoleMonitor {
    177         public void onConsoleMessage(ConsoleMessage message);
    178     }
    179 
    180 }
    181