Fix authentication issue with NextCloud servers

This switches to NextCloud's client library as it is easier to integrate
and it seems to be compatible with ownCloud.

Fixes #651

Author: rivaldi8

app/build.gradle

@@ -209,7 +209,7 @@ repositories{
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile(name:'owncloud_library', ext:'aar')
+    compile 'com.github.nextcloud:android-library:1.0.31'
     compile('com.android.support:support-v4:'       + androidSupportVersion,
             'com.android.support:appcompat-v7:'     + androidSupportVersion,
             'com.android.support:design:'           + androidSupportVersion,

app/libs/owncloud_library.aar

@@ -402,15 +402,21 @@ private void moveExportToOwnCloud() throws Exporter.ExporterException {
             String mimeType = mExporter.getExportMimeType();
 
             RemoteOperationResult result = new UploadRemoteFileOperation(
-                    exportedFilePath, remotePath, mimeType).execute(mClient);
-
+                    exportedFilePath, remotePath, mimeType,
+                    getFileLastModifiedTimestamp(exportedFilePath))
+                    .execute(mClient);
             if (!result.isSuccess())
                 throw new Exporter.ExporterException(mExportParams, result.getLogMessage());
 
             new File(exportedFilePath).delete();
         }
     }
 
+    private static String getFileLastModifiedTimestamp(String path) {
+        Long timeStampLong = new File(path).lastModified() / 1000;
+        return timeStampLong.toString();
+    }
+
     /**
      * Moves the exported files from the internal storage where they are generated to
      * external storage, which is accessible to the user.

app/src/main/java/org/gnucash/android/export/ExportAsyncTask.java

@@ -25,7 +25,7 @@
 import com.owncloud.android.lib.common.operations.RemoteOperationResult;
 import com.owncloud.android.lib.resources.files.FileUtils;
 import com.owncloud.android.lib.resources.status.GetRemoteStatusOperation;
-import com.owncloud.android.lib.resources.users.GetRemoteUserNameOperation;
+import com.owncloud.android.lib.resources.users.GetRemoteUserInfoOperation;
 
 import org.gnucash.android.R;
 
@@ -185,7 +185,7 @@ public void onRemoteOperationFinish(RemoteOperation caller, RemoteOperationResul
                         mServerError.setText(getString(R.string.owncloud_server_invalid));
                         mServerError.setVisibility(View.VISIBLE);
 
-                    } else if (caller instanceof GetRemoteUserNameOperation &&
+                    } else if (caller instanceof GetRemoteUserInfoOperation &&
                             mServerError.getText().toString().equals(getString(R.string.owncloud_server_ok))) {
                         mUsernameError.setTextColor(ContextCompat.getColor(getContext(), R.color.debit_red));
                         mUsernameError.setText(getString(R.string.owncloud_user_invalid));
@@ -196,7 +196,7 @@ public void onRemoteOperationFinish(RemoteOperation caller, RemoteOperationResul
                         mServerError.setTextColor(ContextCompat.getColor(getContext(), R.color.theme_primary));
                         mServerError.setText(getString(R.string.owncloud_server_ok));
                         mServerError.setVisibility(View.VISIBLE);
-                    } else if (caller instanceof GetRemoteUserNameOperation) {
+                    } else if (caller instanceof GetRemoteUserInfoOperation) {
                         mUsernameError.setTextColor(ContextCompat.getColor(getContext(), R.color.theme_primary));
                         mUsernameError.setText(getString(R.string.owncloud_user_ok));
                         mUsernameError.setVisibility(View.VISIBLE);
@@ -209,7 +209,7 @@ public void onRemoteOperationFinish(RemoteOperation caller, RemoteOperationResul
         GetRemoteStatusOperation g = new GetRemoteStatusOperation(mContext);
         g.execute(mClient, listener, mHandler);
 
-        GetRemoteUserNameOperation gu = new GetRemoteUserNameOperation();
+        GetRemoteUserInfoOperation gu = new GetRemoteUserInfoOperation();
         gu.execute(mClient, listener, mHandler);
 
         if (FileUtils.isValidPath(mOC_dir, false)) {