change edit key for empty private master keys

1 files changed, 44 insertions, 0 deletions

diff --git a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/ProviderHelper.java b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/ProviderHelper.java
index 7190d72c4..2665456ea 100644
--- a/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/ProviderHelper.java
+++ b/OpenPGP-Keychain/src/org/sufficientlysecure/keychain/provider/ProviderHelper.java
@@ -34,6 +34,7 @@ import org.sufficientlysecure.keychain.helper.PgpMain;
 import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRings;
 import org.sufficientlysecure.keychain.provider.KeychainContract.Keys;
 import org.sufficientlysecure.keychain.provider.KeychainContract.UserIds;
+import org.sufficientlysecure.keychain.provider.KeychainDatabase.Tables;
 import org.sufficientlysecure.keychain.util.IterableIterator;
 import org.sufficientlysecure.keychain.util.Log;
 
@@ -495,6 +496,49 @@ public class ProviderHelper {
     }
 
     /**
+     * Get empty status of master key of keyring by its row id
+     * 
+     * @param context
+     * @param keyRingRowId
+     * @return
+     */
+    public static boolean getSecretMasterKeyCanSign(Context context, long keyRingRowId) {
+        Uri queryUri = KeyRings.buildSecretKeyRingsUri(String.valueOf(keyRingRowId));
+        return getMasterKeyCanSign(context, queryUri, keyRingRowId);
+    }
+
+    /**
+     * Private helper method to get master key private empty status of keyring by its row id
+     * 
+     * @param context
+     * @param queryUri
+     * @param keyRingRowId
+     * @return
+     */
+    private static boolean getMasterKeyCanSign(Context context, Uri queryUri, long keyRingRowId) {
+        String[] projection = new String[] { KeyRings.MASTER_KEY_ID, "(SELECT COUNT(sign_keys." + 
+            Keys._ID + ") FROM " + Tables.KEYS + " AS sign_keys WHERE sign_keys." + Keys.KEY_RING_ROW_ID + " = "
+            + KeychainDatabase.Tables.KEY_RINGS + "." + KeyRings._ID + " AND sign_keys."
+            + Keys.CAN_SIGN + " = '1' AND " + Keys.IS_MASTER_KEY + " = 1) AS sign",  };
+
+        ContentResolver cr = context.getContentResolver();
+        Cursor cursor = cr.query(queryUri, projection, null, null, null);
+
+        long masterKeyId = -1;
+        if (cursor != null && cursor.moveToFirst()) {
+            int masterKeyIdCol = cursor.getColumnIndex("sign");
+
+            masterKeyId = cursor.getLong(masterKeyIdCol);
+        }
+
+        if (cursor != null) {
+            cursor.close();
+        }
+
+        return (masterKeyId > 0);
+    }
+
+    /**
      * Get master key id of keyring by its row id
      * 
      * @param context