Refactoring

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

@@ -0,0 +1,44 @@
+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 2018-2022 by Marcel Bokhorst (M66B)
+*/
+
+import android.content.Context;
+
+import java.util.List;
+
+import javax.mail.Address;
+import javax.mail.internet.InternetAddress;
+
+public class SmimeHelper {
+    static boolean hasSmimeKey(Context context, List<Address> recipients) {
+        if (recipients == null || recipients.size() == 0)
+            return false;
+
+        DB db = DB.getInstance(context);
+        for (Address address : recipients) {
+            String email = ((InternetAddress) address).getAddress();
+            List<EntityCertificate> certs = db.certificate().getCertificateByEmail(email);
+            if (certs != null && certs.size() > 0)
+                return true;
+        }
+
+        return false;
+    }
+}