Enhanced camera/audio and geolocation permissions

android/src/main/java/com/reactnativecommunity/webview/RNCWebViewManager.java

@@ -2,6 +2,7 @@ package com.reactnativecommunity.webview;
 
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
+import android.app.Activity;
 import android.app.DownloadManager;
 import android.content.Context;
 import android.content.Intent;
@@ -37,6 +38,8 @@ import android.webkit.WebView;
 import android.webkit.WebViewClient;
 import android.widget.FrameLayout;
 
+import com.facebook.react.modules.core.PermissionAwareActivity;
+import com.facebook.react.modules.core.PermissionListener;
 import com.facebook.react.views.scroll.ScrollEvent;
 import com.facebook.react.views.scroll.ScrollEventType;
 import com.facebook.react.views.scroll.OnScrollDispatchHelper;
@@ -76,7 +79,9 @@ import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLEncoder;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 
@@ -868,12 +873,36 @@ public class RNCWebViewManager extends SimpleViewManager<WebView> {
       View.SYSTEM_UI_FLAG_IMMERSIVE |
       View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
 
+    protected static final int COMMON_PERMISSION_REQUEST = 3;
+
     protected ReactContext mReactContext;
     protected View mWebView;
 
     protected View mVideoView;
     protected WebChromeClient.CustomViewCallback mCustomViewCallback;
 
+    /*
+     * - Permissions -
+     * As native permissions are asynchronously handled by the PermissionListener, many fields have
+     * to be stored to send permissions results to the webview
+     */
+
+    // Webview camera & audio permission callback
+    protected PermissionRequest permissionRequest;
+    // Webview camera & audio permission already granted
+    protected ArrayList<String> grantedPermissions;
+
+    // Webview geolocation permission callback
+    protected GeolocationPermissions.Callback geolocationPermissionCallback;
+    // Webview geolocation permission origin callback
+    protected String geolocationPermissionOrigin;
+
+    // true if native permissions dialog is shown, false otherwise
+    protected boolean permissionsRequestShown = false;
+    // Pending Android permissions for the next request
+    protected ArrayList<String> pendingPermissions = new ArrayList<>();
+
+
     public RNCWebChromeClient(ReactContext reactContext, WebView webView) {
       this.mReactContext = reactContext;
       this.mWebView = webView;
@@ -888,42 +917,6 @@ public class RNCWebViewManager extends SimpleViewManager<WebView> {
       return true;
     }
 
-    // Fix WebRTC permission request error.
-    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
-    @Override
-    public void onPermissionRequest(final PermissionRequest request) {
-      String[] requestedResources = request.getResources();
-      ArrayList<String> permissions = new ArrayList<>();
-      ArrayList<String> grantedPermissions = new ArrayList<String>();
-      for (int i = 0; i < requestedResources.length; i++) {
-        if (requestedResources[i].equals(PermissionRequest.RESOURCE_AUDIO_CAPTURE)) {
-          permissions.add(Manifest.permission.RECORD_AUDIO);
-        } else if (requestedResources[i].equals(PermissionRequest.RESOURCE_VIDEO_CAPTURE)) {
-          permissions.add(Manifest.permission.CAMERA);
-        }
-        // TODO: RESOURCE_MIDI_SYSEX, RESOURCE_PROTECTED_MEDIA_ID.
-      }
-
-      for (int i = 0; i < permissions.size(); i++) {
-        if (ContextCompat.checkSelfPermission(mReactContext, permissions.get(i)) != PackageManager.PERMISSION_GRANTED) {
-          continue;
-        }
-        if (permissions.get(i).equals(Manifest.permission.RECORD_AUDIO)) {
-          grantedPermissions.add(PermissionRequest.RESOURCE_AUDIO_CAPTURE);
-        } else if (permissions.get(i).equals(Manifest.permission.CAMERA)) {
-          grantedPermissions.add(PermissionRequest.RESOURCE_VIDEO_CAPTURE);
-        }
-      }
-
-      if (grantedPermissions.isEmpty()) {
-        request.deny();
-      } else {
-        String[] grantedPermissionsArray = new String[grantedPermissions.size()];
-        grantedPermissionsArray = grantedPermissions.toArray(grantedPermissionsArray);
-        request.grant(grantedPermissionsArray);
-      }
-    }
-
     @Override
     public void onProgressChanged(WebView webView, int newProgress) {
       super.onProgressChanged(webView, newProgress);
@@ -949,11 +942,164 @@ public class RNCWebViewManager extends SimpleViewManager<WebView> {
           event));
     }
 
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    @Override
+    public void onPermissionRequest(final PermissionRequest request) {
+
+      grantedPermissions = new ArrayList<>();
+
+      ArrayList<String> requestedAndroidPermissions = new ArrayList<>();
+      for (String requestedResource : request.getResources()) {
+        String androidPermission = null;
+
+        if (requestedResource.equals(PermissionRequest.RESOURCE_AUDIO_CAPTURE)) {
+          androidPermission = Manifest.permission.RECORD_AUDIO;
+        } else if (requestedResource.equals(PermissionRequest.RESOURCE_VIDEO_CAPTURE)) {
+          androidPermission = Manifest.permission.CAMERA;
+        }
+        // TODO: RESOURCE_MIDI_SYSEX, RESOURCE_PROTECTED_MEDIA_ID.
+
+        if (androidPermission != null) {
+          if (ContextCompat.checkSelfPermission(mReactContext, androidPermission) == PackageManager.PERMISSION_GRANTED) {
+            grantedPermissions.add(requestedResource);
+          } else {
+            requestedAndroidPermissions.add(androidPermission);
+          }
+        }
+      }
+
+      // If all the permissions are already granted, send the response to the WebView synchronously
+      if (requestedAndroidPermissions.isEmpty()) {
+        request.grant(grantedPermissions.toArray(new String[0]));
+        grantedPermissions = null;
+        return;
+      }
+
+      // Otherwise, ask to Android System for native permissions asynchronously
+
+      this.permissionRequest = request;
+
+      requestPermissions(requestedAndroidPermissions);
+    }
+
+
     @Override
     public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) {
-      callback.invoke(origin, true, false);
+
+      if (ContextCompat.checkSelfPermission(mReactContext, Manifest.permission.ACCESS_FINE_LOCATION)
+        != PackageManager.PERMISSION_GRANTED) {
+
+        /*
+         * Keep the trace of callback and origin for the async permission request
+         */
+        geolocationPermissionCallback = callback;
+        geolocationPermissionOrigin = origin;
+
+        requestPermissions(Collections.singletonList(Manifest.permission.ACCESS_FINE_LOCATION));
+
+      } else {
+        callback.invoke(origin, true, true);
+      }
+    }
+
+    private PermissionAwareActivity getPermissionAwareActivity() {
+      Activity activity = mReactContext.getCurrentActivity();
+      if (activity == null) {
+        throw new IllegalStateException("Tried to use permissions API while not attached to an Activity.");
+      } else if (!(activity instanceof PermissionAwareActivity)) {
+        throw new IllegalStateException("Tried to use permissions API but the host Activity doesn't implement PermissionAwareActivity.");
+      }
+      return (PermissionAwareActivity) activity;
+    }
+
+    private synchronized void requestPermissions(List<String> permissions) {
+
+      /*
+       * If permissions request dialog is displayed on the screen and another request is sent to the
+       * activity, the last permission asked is skipped. As a work-around, we use pendingPermissions
+       * to store next required permissions.
+       */
+
+      if (permissionsRequestShown) {
+        pendingPermissions.addAll(permissions);
+        return;
+      }
+
+      PermissionAwareActivity activity = getPermissionAwareActivity();
+      permissionsRequestShown = true;
+
+      activity.requestPermissions(
+        permissions.toArray(new String[0]),
+        COMMON_PERMISSION_REQUEST,
+        webviewPermissionsListener
+      );
+
+      // Pending permissions have been sent, the list can be cleared
+      pendingPermissions.clear();
     }
 
+
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    private PermissionListener webviewPermissionsListener = (requestCode, permissions, grantResults) -> {
+
+      permissionsRequestShown = false;
+
+      /*
+       * As a "pending requests" approach is used, requestCode cannot help to define if the request
+       * came from geolocation or camera/audio. This is why shouldAnswerToPermissionRequest is used
+       */
+      boolean shouldAnswerToPermissionRequest = false;
+
+      for (int i = 0; i < permissions.length; i++) {
+
+        String permission = permissions[i];
+        boolean granted = grantResults[i] == PackageManager.PERMISSION_GRANTED;
+
+        if (permission.equals(Manifest.permission.ACCESS_FINE_LOCATION)
+          && geolocationPermissionCallback != null
+          && geolocationPermissionOrigin != null) {
+
+          if (granted) {
+            geolocationPermissionCallback.invoke(geolocationPermissionOrigin, true, true);
+          } else {
+            geolocationPermissionCallback.invoke(geolocationPermissionOrigin, false, false);
+          }
+
+          geolocationPermissionCallback = null;
+          geolocationPermissionOrigin = null;
+        }
+
+        if (permission.equals(Manifest.permission.RECORD_AUDIO)) {
+          if (granted && grantedPermissions != null) {
+            grantedPermissions.add(PermissionRequest.RESOURCE_AUDIO_CAPTURE);
+          }
+          shouldAnswerToPermissionRequest = true;
+        }
+
+        if (permission.equals(Manifest.permission.CAMERA)) {
+          if (granted && grantedPermissions != null) {
+            grantedPermissions.add(PermissionRequest.RESOURCE_VIDEO_CAPTURE);
+          }
+          shouldAnswerToPermissionRequest = true;
+        }
+      }
+
+      if (shouldAnswerToPermissionRequest
+        && permissionRequest != null
+        && grantedPermissions != null) {
+        permissionRequest.grant(grantedPermissions.toArray(new String[0]));
+        permissionRequest = null;
+        grantedPermissions = null;
+      }
+
+      if (!pendingPermissions.isEmpty()) {
+        requestPermissions(pendingPermissions);
+        return false;
+      }
+
+      return true;
+    };
+
     protected void openFileChooser(ValueCallback<Uri> filePathCallback, String acceptType) {
       getModule(mReactContext).startPhotoPickerIntent(filePathCallback, acceptType);
     }