extract UpdatedKeys access from KeychainProvider into KeyMetadataDao

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/model/CustomColumnAdapters.java

@@ -0,0 +1,28 @@
+package org.sufficientlysecure.keychain.model;
+
+
+import java.util.Date;
+
+import android.support.annotation.NonNull;
+
+import com.squareup.sqldelight.ColumnAdapter;
+
+
+public final class CustomColumnAdapters {
+
+    private CustomColumnAdapters() { }
+
+    static final ColumnAdapter<Date,Long> DATE_ADAPTER = new ColumnAdapter<Date,Long>() {
+        @NonNull
+        @Override
+        public Date decode(Long databaseValue) {
+            // Both SQLite and OpenPGP prefer a second granularity for timestamps - so we'll translate here
+            return new Date(databaseValue * 1000);
+        }
+
+        @Override
+        public Long encode(@NonNull Date value) {
+            return value.getTime() / 1000;
+        }
+    };
+}

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/model/KeyMetadata.java

@@ -0,0 +1,24 @@
+package org.sufficientlysecure.keychain.model;
+
+
+import com.google.auto.value.AutoValue;
+import org.sufficientlysecure.keychain.KeyMetadataModel;
+
+
+@AutoValue
+public abstract class KeyMetadata implements KeyMetadataModel {
+    public static final Factory<KeyMetadata> FACTORY = new Factory<>(
+            AutoValue_KeyMetadata::new, CustomColumnAdapters.DATE_ADAPTER);
+
+    public boolean hasBeenUpdated() {
+        return last_updated() != null;
+    }
+
+    public boolean isPublished() {
+        if (last_updated() == null) {
+            throw new IllegalStateException("Cannot get publication state if key has never been updated!");
+        }
+        Boolean seenOnKeyservers = seen_on_keyservers();
+        return seenOnKeyservers != null && seenOnKeyservers;
+    }
+}