show prompt before file download, mic and camera access (#8)

* show prompt before download starts

* prompt user before allowing mic and camera access

Author: jpcloureiro

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

@@ -3,6 +3,8 @@
 import android.Manifest;
 import android.annotation.TargetApi;
 import android.app.Activity;
+import android.app.AlertDialog;
+import android.content.DialogInterface;
 import android.content.pm.PackageManager;
 import android.net.Uri;
 import android.os.Build;
@@ -150,11 +152,14 @@ public void onPermissionRequest(final PermissionRequest request) {
         ArrayList<String> requestedAndroidPermissions = new ArrayList<>();
         for (String requestedResource : request.getResources()) {
             String androidPermission = null;
+            String requestPermissionIdentifier = null;
 
             if (requestedResource.equals(PermissionRequest.RESOURCE_AUDIO_CAPTURE)) {
                 androidPermission = Manifest.permission.RECORD_AUDIO;
+                requestPermissionIdentifier = "microphone";
             } else if (requestedResource.equals(PermissionRequest.RESOURCE_VIDEO_CAPTURE)) {
                 androidPermission = Manifest.permission.CAMERA;
+                requestPermissionIdentifier = "camera";
             } else if(requestedResource.equals(PermissionRequest.RESOURCE_PROTECTED_MEDIA_ID)) {
                 if (mAllowsProtectedMedia) {
                   grantedPermissions.add(requestedResource);
@@ -169,9 +174,23 @@ public void onPermissionRequest(final PermissionRequest request) {
                   androidPermission = PermissionRequest.RESOURCE_PROTECTED_MEDIA_ID;
                 }            }
             // TODO: RESOURCE_MIDI_SYSEX, RESOURCE_PROTECTED_MEDIA_ID.
+            String alertMessage = String.format("Allow this app to use your " + requestPermissionIdentifier + "?");
             if (androidPermission != null) {
                 if (ContextCompat.checkSelfPermission(this.mWebView.getThemedReactContext(), androidPermission) == PackageManager.PERMISSION_GRANTED) {
-                    grantedPermissions.add(requestedResource);
+                    AlertDialog.Builder builder = new AlertDialog.Builder(this.mWebView.getContext());
+                    builder.setMessage(alertMessage);
+                    builder.setCancelable(false);
+                    String finalAndroidPermission = androidPermission;
+                    builder.setPositiveButton("Allow", (dialog, which) -> {
+                        permissionRequest = request;
+                        grantedPermissions.add(finalAndroidPermission);
+                        requestPermissions(grantedPermissions);
+                    });
+                    builder.setNegativeButton("Don't allow", (dialog, which) -> {
+                        request.deny();
+                    });
+                    AlertDialog alertDialog = builder.create();
+                    alertDialog.show();
                 } else {
                     requestedAndroidPermissions.add(androidPermission);
                 }
@@ -180,8 +199,10 @@ public void onPermissionRequest(final PermissionRequest request) {
 
         // 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;
+            if (!grantedPermissions.isEmpty()) {
+                request.grant(grantedPermissions.toArray(new String[0]));
+                grantedPermissions = null;
+            }
             return;
         }
 

android/src/main/java/com/reactnativecommunity/webview/RNCWebViewManagerImpl.kt

@@ -1,6 +1,8 @@
 package com.reactnativecommunity.webview
 
+import android.app.AlertDialog
 import android.app.DownloadManager
+import android.content.DialogInterface
 import android.content.pm.ActivityInfo
 import android.graphics.Bitmap
 import android.graphics.Color
@@ -106,34 +108,42 @@ class RNCWebViewManagerImpl {
 
             val downloadMessage = "Downloading $fileName"
 
-            //Attempt to add cookie, if it exists
-            var urlObj: URL? = null
-            try {
-                urlObj = URL(url)
-                val baseUrl = urlObj.protocol + "://" + urlObj.host
-                val cookie = CookieManager.getInstance().getCookie(baseUrl)
-                request.addRequestHeader("Cookie", cookie)
-            } catch (e: MalformedURLException) {
-                Log.w(TAG, "Error getting cookie for DownloadManager", e)
-            }
+            val builder = AlertDialog.Builder(webView.context)
+            builder.setMessage("Do you want to download \n$fileName?")
+            builder.setCancelable(false)
+            builder.setPositiveButton("Download") { _, _ ->
+                //Attempt to add cookie, if it exists
+                var urlObj: URL? = null
+                try {
+                    urlObj = URL(url)
+                    val baseUrl = urlObj.protocol + "://" + urlObj.host
+                    val cookie = CookieManager.getInstance().getCookie(baseUrl)
+                    request.addRequestHeader("Cookie", cookie)
+                } catch (e: MalformedURLException) {
+                    Log.w(TAG, "Error getting cookie for DownloadManager", e)
+                }
 
-            //Finish setting up request
-            request.addRequestHeader("User-Agent", userAgent)
-            request.setTitle(fileName)
-            request.setDescription(downloadMessage)
-            request.allowScanningByMediaScanner()
-            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
-            request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName)
-            module.setDownloadRequest(request)
-            if (module.grantFileDownloaderPermissions(
-                    getDownloadingMessageOrDefault(),
-                    getLackPermissionToDownloadMessageOrDefault()
-                )
-            ) {
-                module.downloadFile(
-                    getDownloadingMessageOrDefault()
-                )
+                //Finish setting up request
+                request.addRequestHeader("User-Agent", userAgent)
+                request.setTitle(fileName)
+                request.setDescription(downloadMessage)
+                request.allowScanningByMediaScanner()
+                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
+                request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName)
+                module.setDownloadRequest(request)
+                if (module.grantFileDownloaderPermissions(
+                                getDownloadingMessageOrDefault(),
+                                getLackPermissionToDownloadMessageOrDefault()
+                        )
+                ) {
+                    module.downloadFile(
+                            getDownloadingMessageOrDefault()
+                    )
+                }
             }
+            builder.setNegativeButton("Cancel") { _: DialogInterface?, _: Int -> }
+            val alertDialog = builder.create()
+            alertDialog.show()
         })
         return RNCWebViewWrapper(context, webView)
     }