Bind to PGP service if needed

app/src/main/java/eu/faircode/email/PgpHelper.java

@@ -0,0 +1,70 @@
+package eu.faircode.email;
+
+/*
+    This file is part of FairEmail.
+
+    FairEmail is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    FairEmail is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018-2021 by Marcel Bokhorst (M66B)
+*/
+
+import android.content.Context;
+
+import org.openintents.openpgp.IOpenPgpService2;
+import org.openintents.openpgp.util.OpenPgpServiceConnection;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.Semaphore;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.ReentrantLock;
+
+public class PgpHelper {
+    private static final long CONNECT_TIMEOUT = 5000L;
+
+    static OpenPgpServiceConnection getConnection(Context context) {
+        return getConnection(context, CONNECT_TIMEOUT);
+    }
+
+    static OpenPgpServiceConnection getConnection(Context context, long timeout) {
+        final String pkg = Helper.getOpenKeychainPackage(context);
+        Log.i("PGP binding to " + pkg + " timeout=" + timeout);
+
+        CountDownLatch latch = new CountDownLatch(1);
+        OpenPgpServiceConnection pgpService = new OpenPgpServiceConnection(context, pkg,
+                new OpenPgpServiceConnection.OnBound() {
+                    @Override
+                    public void onBound(IOpenPgpService2 service) {
+                        Log.i("Bound to " + pkg);
+                        latch.countDown();
+                    }
+
+                    @Override
+                    public void onError(Exception ex) {
+                        Log.i(ex.getMessage());
+                        latch.countDown();
+                    }
+                });
+        pgpService.bindToService();
+
+        try {
+            latch.await(timeout, TimeUnit.MILLISECONDS);
+        } catch (InterruptedException ex) {
+            Log.w(ex);
+        }
+
+        Log.i("PGP bound=" + pgpService.isBound());
+
+        return pgpService;
+    }
+}