ask for required permissions in incoming call

src/main/java/org/thoughtcrime/securesms/preferences/AdvancedPreferenceFragment.java

@@ -210,7 +210,7 @@ public class AdvancedPreferenceFragment extends ListSummaryPreferenceFragment
       callsEnabled.setOnPreferenceChangeListener((preference, newValue) -> {
         if ((Boolean)newValue) {
           new AlertDialog.Builder(requireActivity())
-            .setTitle("Thanks for trying out \"Video Calls\"!")
+            .setTitle("Thanks for trying out \"Calls\"!")
             .setMessage("• You can now call contacts\n\n"
               + "• If you want to quit the experimental feature, you can disable it at \"Settings / Advanced\"")
             .setCancelable(false)

src/main/java/org/thoughtcrime/securesms/videochat/VideochatActivity.java

@@ -1,5 +1,6 @@
 package org.thoughtcrime.securesms.videochat;
 
+import android.Manifest;
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.os.Bundle;
@@ -18,9 +19,11 @@ import com.b44t.messenger.DcChat;
 import com.b44t.messenger.DcContext;
 import com.b44t.messenger.DcEvent;
 
+import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.WebViewActivity;
 import org.thoughtcrime.securesms.connect.DcEventCenter;
 import org.thoughtcrime.securesms.connect.DcHelper;
+import org.thoughtcrime.securesms.permissions.Permissions;
 import org.thoughtcrime.securesms.recipients.Recipient;
 import org.thoughtcrime.securesms.util.AvatarUtil;
 import org.thoughtcrime.securesms.util.Util;
@@ -79,8 +82,21 @@ public class VideochatActivity extends WebViewActivity implements DcEventCenter.
       Util.runOnMain(() -> Objects.requireNonNull(getSupportActionBar()).setTitle(chat.getName()));
     });
 
-    String url = "file:///android_asset/calls/index.html";
-    webView.loadUrl(url + hash);
+    Permissions.with(this)
+      .request(Manifest.permission.CAMERA, Manifest.permission.RECORD_AUDIO)
+      .ifNecessary()
+      .withPermanentDenialDialog(getString(R.string.perm_explain_access_to_camera_denied))
+      .onAllGranted(() -> {
+        String url = "file:///android_asset/calls/index.html";
+        webView.loadUrl(url + hash);
+      }).onAnyDenied(this::finish)
+      .execute();
+  }
+
+  @Override
+  public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+    Permissions.onRequestPermissionsResult(this, requestCode, permissions, grantResults);
   }
 
   @Override

src/main/res/values/strings.xml

@@ -369,7 +369,7 @@
     <string name="file_saved_to">File saved to \"%1$s\".</string>
 
     <string name="start_call">Call</string>
-    <string name="video_calls">Video Calls</string>
+    <string name="calls">Calls</string>
     <string name="answer_call">Answer</string>
     <string name="end_call">Decline</string>
 

src/main/res/xml/preferences_advanced.xml

@@ -23,7 +23,7 @@
         <org.thoughtcrime.securesms.components.SwitchPreferenceCompat
             android:defaultValue="false"
             android:key="pref_calls_enabled"
-            android:title="@string/video_calls"/>
+            android:title="@string/calls"/>
 
         <org.thoughtcrime.securesms.components.SwitchPreferenceCompat
             android:defaultValue="false"